US2159291A - Permutation padlock - Google Patents

Description

May 23, 1939. M. QUINTAL 2,159,291

PERMUTAT ION PADLOC K Filed Jan. 12, 1939 4 Sheets-Sheet 1 3 wue/wtm MQuinZaZ May 23', 1939.

M. QUINTAL PERMUTATION PADLOCK Filed Jan. 12, 1939 4 Sheets-Sheet 5 55 33/ 7 I 5;? f I zi Z Z, Z2; MQuz'iz May 23, 1939. M. QUINTAL 2,159,291

PERMUTAT I 0N PADLOCK Filed Jan. 12, 1939 4 Sheets-Sheet-4 Patented May 23, 1939 UNiTED STATES PATENT OFFICE PERMUTATION PADLOCK of Hawaii Application January 12,

16 Claims.

This invention relates generally to the class of locks and latches and pertains particularly to improvements in locks of the general type known as padlocks.

The present invention has for its primary object to provide a novel and improved type of padlock which is designed so that it cannot be picked as is possible with padlocks of ordinary construction.

Another object of the invention is to provide an improved lock of the type described, wherein a novel dual locking feature is involved, which necessitates the use of certain knowledge for releasing the parts of the lock in addition to the use of a particular key.

A further object of the invention is to provide an improved lockof the type described in which a novel rotary key actuated unit is employed which, in addition to requiring the employment of a key for its manipulation, requires that the user of the key possess certain knowledge with regard to the manner in which the key is to be used.

A still further object of the invention is to provide a lock of the type described wherein there is employed, in addition to a key actuated rotary unit by means of which the actual release of a part of the lock is effected, an auxiliary locking means which secures the key actuated unit and which must be manipulated according to certain knowledge possessed by the user of the lock in order to release the key actuated unit.

Still another object of the invention is to provide in a lock of the type described, a shackle which is joined to the body of the lock in a novel manner whereby the assemblage or disassembly of the lock structure may be easily effected.

Other objects and advantages of the invention will become apparent as the description proceeds and the invention will be best understood from a consideration of the following detailed descrip- 1939, Serial No. 250,647

plane parallel with and midway between the front and rear faces of the lock body.

Fig. 2 is a transverse section taken on the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary section taken on the line 3-3 of Fig. 1.

Fig. 4 is a fragmentary section on the line 4-4 of Fig. 1, showing the cylinders in their relative positions when the lock is unlocked.

Fig. 5 is a section on the line 55 of Fig. 2.

Fig. 6 is a vertical sectional view through the key operated unit per se, showing the starting or original position for the parts.

Fig. 7 is a fragmentary view illustrating the trigger release mechanism and method of actuating the same.

Fig. 8 is a view similar to Fig. 6, but showing the cylinder turned to its second operating position.

Fig. 9 is a sectional View on the line 99 of Fig. 1.

Fig. 10 is a View in elevation of the lock pin operating knob.

Fig. 11 is a sectional view taken longitudinally through a modified form of the lock pin actuating knob.

Fig. 12 is a sectional view on the line |2l2 of Fig. 11.

Fig. 13 is a sectional view taken on the same plane as Fig. 3, but showing the positions of the cylinder and inner and outer barrels before the first step of unlocking the lock has been taken.

Fig. 14 is a view in longitudinal section through a modified form of the key operated unit, the cylinder being in elevation.

Fig. 15 is a sectional view on the line I5l5 of Fig. 14.

Fig. 16 is a sectional view on the line 16-46 of Fig. 14.

Fig. 1'7 is a sectional view on the line ll--|| of Fig. 14.

Referring to the drawings, the numeral l generally designates the body or case of the lock embodying the present invention. This case, as shown in Fig. 2, is relatively narrow from front to back, the front and rear faces being designated by the numerals 2 and 3 while the edge faces are indicated by the numerals 4. As shown in this view, the front, faces are beveled so that th thickness of the body is reduced slightly at the sides.

The top of the body is designated by the numeral 5 while the bottom is designated 6. The body I is formed or cast in a single piece and is provided with the relatively long bore 1 extending through the top 5 downwardly to a point adjacent the bottom, as shown in Fig. 1, and disposed adjacent to and parallel with one edge face or side 4. Adjacent the opposite side 4 there is formed through the top 5 downwardly the short bore or passage 8. The passage 1 constitutes a receptacle for the shank of the shackle, hereinafter described, while the passage 8 constitutes a receptacle for the notched terminal of the shackle as hereinafter described.

The edge wall or face 4 is provided with a dove-tail channel or slot 9 which extends from" the top surface of the cut-out or recessed area- It) which is formed in the top 5 adjacent the open ing 8. This dove-tail slot terminates short of the bottom 6, as shown in Fig. 1.

Formed transversely of the body fromthe bot.-

tom of the slot 9 is a bolt chamber H and the bore 8 passes across the bolt chamber H. Be neath the bolt chamber there is formed the latch pin passage [2 which extends inwardly from the bottom of the slot 9 and directly beneath this passage are two passages l3 and M. which are parallel with one another and with the passage i 2 and which also extend inwardly from the dovetail slot. Extending upwardly through the bottom wall of the'body l is. a chamber l5 which at its upper end is reduced through a portion of its length, as indicated at l6, and this reduced portion opens into the bolt chamber H. The lower end of the chamber 1 5 is enlarged slightly as indicated at H, for the reception of a disk member hereinafter described. The numeral l5 designates the chamber as a whole from the wall 6 to the bolt chamber II, and this chamber receives the key-operated unit hereinafter described.

The numeral I8 generally designates the shackle of the lock which comprises the gooseneck portion 19, the shank portion 20 and the terminal portion 2|, which is provided upon its inner side with the notch '22 for engagement by the bolt. The shank Zllis adapted to extend into the passage 1 and it is provided with a longitudinally extending bore 23 and upon its inner side with a guide slot 24 which extends from a point adjacent the end of the shank throughout the major portion of the length thereof, as shown in Fig. 1. Upon its outer side opposite from the guide slot is a recess 25 in which is positioned the elongated plate 26. This plate constitutes a por-' tion of the shank and is provided to facilitate the securing of the shackle shank in the passage 1.

The lower end of the plate 26 is provided with the recess 21 which extends-around its curved outer surface and meshes or alines with a corresponding recess 28 which is formed around the lower end of the shank, as shown in Fig. 2.

The shank 20 of the shackle is secured in the passage l'by means of a cross-pin 29 which is disposed transversely of and extending through the body of the lock with a portion thereof extending into and across the passage 1, as shown in As shown in Fig. 1, the shank 20 of the shackle does not extend entirely to the bottom of the passage 1. Between the end of the shank and the bottom of the passage in which it is located,there is disposed a cup-like body 30 which has a platelike portion 3| cut from one side thereof, this latter portion extending longitudinally of the cup and the mouth of the opening 32 of the cup is directed upwardly toward the bore or passage 23 of the shackle shank. This cup is employed primarily for retaining in position a gu de pin which is extended from within the bore 1 through a suitable passage into the chamber l5. as function of this pin will be described later in describing the construction of the key-operated unit of the lock. At the present time, it may be stated that in assembling the parts, the pin 32 is introduced into its passage from the lower part of the bore 1 and then the plate-like portion of the cup is introduced into the passage 1 carrying the stud 33 which extends outwardly from the curved side of the plate. This stud is extended through opening 33' extending laterally from the lower end of the passage I and has its outer end swa'ged, as shown, after the plate 3| has been pressed with its curved surfaces firmly against the curved wall of the passage. The cup 39 is then introduced into the passage I with the fiat side thereof adjacent the pin 29 and after the cup, which is of a diameter to snugly fit in the passage 1, has been moved past the pin 29, it is rotated seats to bring its fiat side around into position to correspond withthe flat inner side of the plate 3: and it is then snugly fitted in the bottom of the passage between the plate 3| and the pin 32.

There is then introduced into the cup 3d the headed end of a spring guide pin 34, the shank of which is designed to extend upwardly into the bore 23 of the shackle shank and a suitable spring 35 is then disposed in the passage with the lower end in the cup 30 and the shank of the guide pin extending longitudinally therethrough.

The shank of the shackle is then engaged or mounted in the passage by disposing the plate 26 with'its curved side against the wall of the passage adjacent the pin 29 and with the pin in'the recess 21, thus leaving the upper end of the plate 26' extending from the passage. This end of the plate is provided with a suitable bore tore'ceive aretaining pin 36 which is also adapted to extend into a similar bore in the shank 28, as shown in Fig. 9. The wall of the recess 25-at the lower end of the shank has a short slot 3'! formed therein and the lower end 'of the plate 26 carries a short guide pin 38 for engagement in this slot. After the plate 26 has been disposed as described, the shank 2% is introduced into the passage 1 with the recess 25 di rected toward the side of the passage through which the pin 29 passes, thus facilitating the disposition of the plate 26 in the recess, the guide pin Bil-slipping into the slot 31. The retaining pin 36 is then introduced into the receiving passages therefor to couple the extended end of the plate 26 with the shackle shank and the entire shackle is then revolved so as to bring the guide slot 24 around to the side of the recess adjacent thev pin 29, thus permitting the shank to he slipped in and to compress the spring 35.

The numeral'fifl designates the bolt of the lock which is slidable in the chamber ll. This bolt has thehook d0 upon one end and'upon its top side is provided with a longitudinal guide slot '41 while upon its underside, it is provided with the transverse recess 42 which has engaged [therein an actuating eccentric member hereinafter described.

The top of the lock body is provided with a pin passage 43 in which is secured a bolt guide pin 44. This pin 44 is introduced into its passage from the chamber H before the bolt or the other parts adjacent thereto are assembled and the upper end of the pin is suitably swaged, as shown, so that it will be retained in place and the bolt is then slipped into the chamber H in the proper position to have the projecting end of the guide pin 44 enter the slot 4|. The hook of the bolt will be disposed adjacent the top of the chamber ll so that when the terminal portion 2! of the shackle I8 is introduced into the passage 5], the bolt hook may engage in the notch 22.

As previously stated, the chamber l5 receives the key-actuated mechanism for the look by which mechanism the actuation of the bolt 39 is effected. This key-actuated mechanism or unit consists of three major portions which are an outer barrel 45, an inner barrel 46 and a cylinder ii rotatably disposed within the inner barrel 45. The inner and outer barrels are both open at one end and the outer barrel has a reduced hollow extension 48 at its other end which, when the unit is in the chamber l5, extends into the reduced upper end portion l6 of the chamber, as shown in Fig. 1. Integral with this extension 48 is the eccentric finger 49 and the end of the extension 48 has an opening 50 therethrough which enters one end of the recess 5| in the inner face of the eccentric finger 49.

The outer barrel 45 is provided with a circumferentially extending guide slot 52 which extends around the major portion of this barrel and formed through the barrel in a line extending longitudinally thereof and passing through the unslotted part is a vertical series of holes which are designated 53. 54 and 55. These holes are at the proper position in the outer barrel so that when the barrel is in position in the chamber l5, they will be in the planes, respectively, of the passages l4, l3 and I2, and may be brought into alinement therewith by rotating the barrel. In addition to the three holes mentioned, the outer barrel is provided with a fourth hole which is in the came plane transversely of the barrel from the hole 55 but removed therefrom approximately 96. this fourth hole being indicated by the numoral and particularly illustrated in Fig. 3. This hole 56 receives one of twin latch pins, which pins are designated by the numerals 5'! and 58. These pins are introduced into the assembly of the key-operated unit through a bore 59 which is formed through the front side 2, as shown in Fig. 2. This bore also houses a spring 65 which constantly forces the pins 5!58 inwardly and is retained in place by the plug 61. The action of these twin pins will be hereinafter more fully described.

As shown in Fig. 1, when the outer barrel is in position in the chamber !5, the eccentric finger 45 projects into the bolt chamber II for engagement in the transverse recess 42 of the bolt.

The inner barrel 46 is likewise provided with a circumferential guide slot 63 which, when the barrels are assembled, one within the other, is in the same transverse plane as the guide slot 52 and this slot 63 also extends partway around the barrel 46, as shown in Fig. 4, and when the parts of the lock are in locking position, the barrel 46 will be swung around from the position in which it is shown in this figure. so as to bring the opposite end wall of the slot 63 in contact with the pin 32. In this Fig. 4, as previously stated in the description of the figure, the barrel 46 in the position which it assumes when the parts of the lock are as shown in Fig. 1, that is. when they are in the positions where a counterclockwise turning of the key will rotate all of the parts to retract the bolt 39 and open the look, all as hereinafter more fully described. There are also provided in the inner barrel on a line extending longitudinally thereof through the unslottedportion, three holes 64, 65 and 66, reading from the lower one to the upper one. These holes 64 and 65 are in the same plane transversely of the keyoperated unit as the holes 53 and 54 of the outer barrel 45. The inner barrel 46 has a fourth hole 61 which is in the same plane transversely of the unit as the hole 55 of the outer barrel 45 but is removed from the line of the holes 64, 65 and 65, approximately 90 in the opposite direction from the removal of the hole 56 of barrel 45 from the line of holes 53, 54 and 55. Thus when the holes 66 and 56 are alined to receive the latch pins 51 and 58, the holes 61 and 55 will be alined and the holes 64 to 66, inclusive, will be in the same vertical plane as the hole 56.

The inner barrel 46 is also provided with guide pin holes 68 which are equi-distantly spaced around the barrel and are in the same transverse plane. The purpose of these holes will be later described.

At the upper end of the inner barrel 46, a transversely slotted stem 69 extends from the longitudinal center of the barrel. This stem is designed to project into the outer barrel extension 48, the slot of this stem being indicated by the numeral 15. When the inner barrel is in position in the outer barrel, as shown in Fig. 1, its upper end is maintained in spaced relation from the inner end of the outer barrel extension 48 by the washer ll and the open outer or lower ends of the two barrels will be flush with the inner side of the recess [1 which forms the outer end or mouth of the chamber 15. With the barrels in this assembled position, the guide pin 3?. which is retained in place by the spring supporting cup 30, extends into the two circumferential slots 52 and 63, as hereinbefore stated, so that the two barrels may be relatively rotated as is necessary in the locking and unlocking of the padlock, but will be held against relative longitudinal movement.

Within the outer barrel extension 48 is housed the enlarged lower end portion of a coupling finger 13, the lower end of which is slotted, as indicated at 14, and is in opposition to the slotted end of the stem 69 and also housed within this outer barrel extension is a helical spring 15 which has its ends secured in the slots 'l0'l4, so that upon rotation of the inner barrel, this spring will be placed under tension.

The upper end of the finger 13 passes through the passage 50 and lies in the recess 5| in the inner face of the eccentric finger 49 and is secured to the eccentric finger by the securing pin 16. Rotatably disposed within the inner barrel 46 is the cylinder 41. This cylinder, when fully extended into the inner barrel as it is shown in Fig. 1, has a portion projecting beyond the two barrels so that it may act as a center about which a portion of the unit may rotate as hereinafter described. The cylinder 4! has formed longitudinally thereof from one end, the key slot 11 which is of rectangular cross-section and which is of the same width throughout its length and each of the side walls of this slot has a key guide groove 18 formed in and longitudinally thereof. Formed radially in the cylinder are tumbler holes 19, each of which extends through one side of the cylinder and into the narrow edge of the key slot 11, so that each tumbler hole extends parallel with the side faces of the key slot in which the grooves 18 are formed.

Extending transversely through the cylinder and through each tumbler hole is a spring slot and extending longitudinally through the cylinder at one side of the 'key slot and of, the tumbler holes which are arranged in a line longitudinally of the cylinder, is a bore for the reception of a spring retaining pin 8I. This pin passes through the spring slots and also through the coil of a spring 82 which is in each slot and which has one end secured, as indicated at 83, in a hole in the wall of the cylinder adjacent to the tumbler hole.

Each of the tumbler holes "I9 has a tumbler pin 84 slidably disposed therein and each pin has a transverse slot 85 in which the other end of the adjacent spring 82 engages, the said end-of the At the upper end of the cylinder 41, the outersurface is provided with an encircling channel or groove 86 and upon reference to Fig. 1, it will be seen that this channel 86 receives the ends of retaining pins 81, which are secured in the holes 68 of the inner barrel 46. While pins have-been shown in the holes 08, it will be understood that use may be made in their stead of bearing balls which might be secured in the holes and allowed to project so as to have a portion extending into the circumferentialchannel 86 of the cylinder. This connection between the cylinder. and inner barrel is made merely for the purpose of retaining these two members in such assembled relation that they will have free relative rotary motion. The tumbler holes I9 are so spaced that the first two, counting from the bottom upwardly, will lie in the same plane transversely of the unit as the holes 53 and 54 of the outer cylinder and the holes 64 and 65 of the inner cylinder, and the third one of the tumbler holes lies in the plane of the holes 66 and 56, of the innerand outer barrels, respectively. The fourth one of the tumbler holes, counting from the lowest one upwardly, lies in the plane of the holes 61 and of the inner and outer barrels.

At the lower end of the cylinder 4'I beneath the lowest one of the tumbler holes is a lock pin hole 81 and upon each side of this hole, the surface of the cylinder has therein ratchet pin dimples 88. I The hole 8'I' and dimples 88 are arranged to be in a plane beneath the lower ends of the inner and outer barrelswhen the cylinder isin position in the inner barrel. Within the annular recess I! which forms the mouth of the chamber I5, is a washer 89 which is provided with openings to receive securing pins 90 which are secured to the lower edge of the outer barrel and extend downwardly through the washer, as shown-in Fig. 1. Thesepins have their lower ends suitably swaged. to hold the washer firmly into contact with the lower end of the outer barrel to which it is attached and also the inner barrel, the washer snugly encircling the lower end of the cylinder about which it is adapted to turn. The washer 89 has a radial latch pin bore 9| in which is held, by a plug 92 in the outer end of the bore, the spring 93 and the inner and outer latch pins 90 and. 95,- respectively. Secured to the underside or bottom 6 of the body is a guide annulus 98 and within this annulus is a cover plate 91 which is provided with a key opening 98 which alines with the key slotof the cylinder. This cover plate is secured in position by pin members 99which pass through the cover plate into the lower end of the cylinder. Thus it will be seen that the pin 32 retains the inner and outer barrels against longitudinal .movement in the chamber; I5, the pins 81 carried bythe inner barrel prevent longitudinal movement of the cylinder, and the cylinder maintains in place the cover plate 91 which covers the rotatable Washer 89. a r

In addition to the openings or bores formed in the body as previously-described, there is provided a lateral bore orpassage I00 which opens through the front side 2 of the body and at its inner end opens through the reduced portion IN,

into the latch pin passage I2. Within the latch pinpassage is a reciprocable pin bolt I02 which has a'reduced inner end finger I03 which is adapted to extend into the holes 55 and 61 of the outer and inner barrels, respectively, when such holes are brought into alined relation. This pin bolt I 02 has an annular cam groove I04 in the side thereof, which is directed toward the adjacent bore I00. Within the bore I00 is a collar I05 which has a central passage therethrough for the stem I06 of the eccentric head I01. has an annular flange I08 on its face which engages in the annular cam groove I04, as shown in Fig. 2. The collar I05 is retained in position by pins I09 which are introduced through suitable bores formed in the body I and which pass through one edge of the dove-tail slot 9-, as shown in Fig. 2, engaging at their inner ends in the annular recess IIO encircling the-collar I05.

The outer end of the collar I05 has the reduced This head extension II I on which is mounted the knob II2,

and. a pin II3 passes through the knob and through the stem I00 to secure the parts together.

As will be seen from the foregoing, the latch pin bolt I02 may be reciprocated by rotating the knob I I2 so as to move the bolt finger I03 with respect to the holes 55 and 61.

Within the passages I3 and I4 are securing pins H4 and I I5, -the pin II4 being pressed by the spring H6 and the pin II5 being pressed by the spring 1. The pin II4 is adapted to engage in the recess into which the hole 54 opens and has a reduced forward end portion which enters the hole 54 when the adjacent tumbler is retracted and the .pin H5 has a reduced forward end portion for engagement in the hole 53 of the I09, the latch pin bolt I02 and the springs lying therebeneath by which the pins IM and H5 are actuated and after this plate has been placed in position, a cap plate I I9 is secured in the recess I0 by the securing pins I20. This cap plate is provided with a suitable opening I2I to permit the terminal portion of the shackle I8 to pass through into the passage 8 and the pins I25, after being driven in, are finished off flush with the top of the cap plate so that the latter cannot be removed.

When the shackle I8 of the lock is down or in the position where the terminal portion ZI is within the body passage 8 and is engaged by the bolt 39, the parts of .the key actuated unit will be in the relation shown in Fig. 6. When in this lock pins 51 and 58 will be projected by the spring 55 so that the inner pin 57 will be in the hole 56 of the inner barrel and will extend partly into the hole 55 of the outer barrel, thus locking these two barrels together and also the outer pin 58 will be partly in the hole 56 of the outer barrel and in the bore 55 of the body I, thus locking the outer barrel to the body. The extended ends of the lock pins H4 and H will be engaged in the holes 53 and 54 of the outer barrel. Thus it will be seen that the bolt 39 is doubly locked against movement and unless the possessor of the key for the lock is also in possession of knowledge enabling him to manipulate the knob H2 to the proper position for removing the finger "33 out of both holes 55 and 6?, the key will be of no value in operating the lock.

The procedure for releasing the bolt by the use of the key is as follows:

The key is first reversed and its narrow end inserted into the slot 17. The key, which is indi- 'cated by the numeral I22, has upon each of its faces two alined buttons I23 and when the end of the key is slipped into the key groove 18 as shown in Fig. 7, with the buttons engaging the edges of the grooves, the end of the key can be oscillated slightly so as to press back the outer pin 95 of the two latch pins carried by washer 89 until the abutting ends of the pins 94 and 95 come into position fiush with the contacting faces of the cylinder and the adjacent barrel. This will permit the cylinder to be turned by the key while it is still in the position described. The cylinder is then given a slightly counterclockwise rotation to shift the pin 95 out of alinement with pin 94 and the key is then withdrawn and reinserted in the forced into the hole 56, forcing outwardly the locking pins 57 and 56 against the tension of the spring 60, so that the forward end of the tumbler will take up the position previously occupied by the pin 5'! in aperture 56 and force this pin over into aperture 56, forcing the outer pin 58 into the bore 59 of the lock body. This then permits,

after the hereinafter described further adjustment of the lock parts; the simultaneous turning of the cylinder 4'! and the barrel 45, leaving the pin 51 to turn with the barrel 45 when this barrel 'is rotated. The cam actuating knob is then turned to retract the finger I03 from the openings 55 and 61. Rotary motion may now be trans- 'mitted simultaneously to the cylinder and inner barrel, such turning bringing the tumblers back to their initial positions and simultaneously twisting and imparting tension to the bolt actuating spring The barrels will now be in the relative posi tions shown in Fig. 4. It will be understood that up to this point, the key has not been fully inserted in the cylinder, because the tumblers have only been projected into the openings 64, 65 and 55 of the barrel 46 and will be in abutting relation with the inner face of the barrel'45, but as the tumblers are now back in their initial positions, the first and second tumblers will be alined with the pins I I4 and H5 and with the passages 54 and 53 and, therefore, the key may be fully thrust into the cylinder so as to project the first two tumbler pins to the positions shown in Fig. 1,

thus forcing outwardly the pins H4 and H5 to fully released positions. The cylinder and barrels are now all coupled together so that they may be turned as a unit and the spring 15 is held under tension. By now turning the key in a counterclockwise direction, the entire assemblage consisting of the inner and outer barrels, the cylinder and the elements in the upper part of the outer barrel, will be turned so as to effect retraction of the bolt 39.

It will, of course, be understood that when the cylinder is released from its connection with the nner barrel by forcing back the locking pins 94 and 95, the extent to which the cylinder must be turned in order to bring the tumblers into alinement with the openings or holes 54, 65 and 53, can be determined by the number of clicks which will be given as the inner locking pin 94 moves across or into and out of the dimples 88 when the cylinder is being turned, it being understood that a part of the knowledge necessary for the manipulation of the lock will be an understanding of the number of clicks which must be made in order to bring the tumblers into the right position where they can be projected into the openings of the inner barrel.

After the cylinder and inner barrel have been turned back to bring the first two tumblers into alinement with the pins I I4 and I I5, the cylinder will again be in a position where the pins 94 and 95 might again be projected into locking position if the key were removed but they will be held in the position shown in Fig. 1 so long as the key is fully extended into the lock cylinder.

After the bolt has been released in the manner described, the lock shackle l8 will be projected to open position by the spring 35 and the parts will remain in position where the shackle may again be returned to its locking position. If the key should be removed, the twisting action imparted by the spring '15 upon the inner barrel will establish sufiicient frictional engagement between the lower tumblers and the outer barrel to prevent the tumbler springs from retracting the tumblers. However, if the tumblers should be withdrawn by their springs and the spring 15 should produce rotation of the inner barrel, it is merely necessary in order to return the parts to their former position, to repeat the procedure initially described for opening the lock.

The procedure for locking the lock is as follows:

If the key has not been removed after the terminal portion of the shackle [8 was released from engagement by the bolt 39, then it is merely necessary to push the terminal portion of the shackle into the bore 8 and then turn the key in a clockwise direction until the holes 53 and 54 have been brought into alinement again with the pins H4 and H5. Without removing the key, the locking finger actuating knob l I 2 is then turned to the necessary extent either to the right or to the left, as may be required, by indicating characters on the body of the lock, to project the finger [03 into the hole 55. This will insure the positioning of the holes 53 and 54 so that the pins H4l l5 will enter them. When this has been done, the key is removed and the pins H4-l 15 will engage the outer barrel and lock it.

As the key is withdrawn from the cylinder, the tumblers will be released and should be retracted or drawn back into the cylinder so as to break the connection between the cylinder and the inner barrel 46. The tensioned spring 15 will then take control of the barrel 46 and rotate it in a'counterclockwise direction back? to the positionwhere the pins 51 and 58 will be projected inwardly by the spring 60 so as to lock the inner and outer cylinders together in the manner shown inFig. 13. If the frictional contact between the tumbler pins and the inner cylinder is too tight to permit the tumbler springs to retract the tumblers, such frictional contact being made tight by the tendency of the spring 15 to rotate the inner barrel against the tumblers, the tumblers may be freed so as to be retracted by their springs, by not fully withdrawing the key and giving a slight back and forward twist or turn to it so that the tumblers can be released. They the key can be withdrawn to allow thespring I5 to taken control. The knob '2 may then be further turned to completely project the locking finger 403 through the alined passages 55 and I5! of the inner and outer barrels, as shown in Fig. 6.

'Fig. l shows a portion of the front of the lock and' illustrates one form of marking which may be employed inconnection with the lock pin operating knob H2. The knob is provided with an indicator or pointer I24- and the numbers appearing on the body of the look around the knob and shown in dotted outline, represent different positions to which the pointer may be turned by revolving the knob so as to shift the lock finger to a desired position with respect to the barrels 45 and 46. For example, these numbers progress from I to 4 in a clockwise direction around the knob, the number I appearing at the top of the knob. In actual practice, these num- 35 bers will not be placed on thelock but it will be necessary for the user of the lock to remember the relative positions of these points. Thus when the knob H2 is manipulated as above described in connection with the explanation of the .manner in which the lock is opened,it may be necessary for the user to turn the pointer I24 to the engage in'the'holes 53 and 54, the knob I I2 might beturned so'that the pointer I24 willv be at approximately' the position indicated by the numeral- 7 2 on the body forengagernent in the outer barrel hole 55 and then when the knobis manipulated to again retract the latchpin finger so as to'p'ermit the inner barrel to be freely rotated by the spring, the pointer will be moved back to position't l and when the two barrels are in their normal position where the holes 65 and 6'! are inlalinement, the knob will be reversely ro- 60' tatedba'ck to position #1, so that the lock pin finger will befully extended into these holes.

'It will be understood, of course, that in various locks, the secret positionsof the points to which the indicator I24 may be turned will differ so that a person owning'one lock will not know the manipulation of the knob I I 2 necessary for the opening of another lock.

It will also be understood that in the, constructionof different locks, various changes may be made in the positionof thelockingnpins 51 and 58, necessitating the rotation of the cylinder to different degreesin order to bring the-tumbler pins intothe proper position where the necessary connection ofthe pins with the inner barrel can-be snag iestablished. As previously stated, the extent to which the cylinder must" be turned in order to bring the tumbler pins into the proper position for engagement with the inner barrel and release of the locking pin" 51', willbe determined by the number of clicks'made by the pin 94 as it slips into and out of the dimples around the cylinder as the cylinder is turned.

corresponding to collar I05 is indicated by the numeral I25. This collar has a central passage therethrough, as indicated at I26, for alinement with the center of the bore I00 and is provided with a groove I21 for engagement by the ends of pinsl28 corresponding to the pins I09. These pins I28 are inserted-through the edge of the dove-tail slot 9 and are notched, similarly to the pins I09, so that the plate I I8 will engage the pins and prevent their accidental or the intentional removal thereof.

The knob of the modified control device is indicated by the numeral I29- and has'an extension I30 upon its inner end which projectsinto an enlarged outer portion of the opening or bore I26 of the adjacent collar and this extension is grooved, as indicated at I3I, for the reception of the end of a lock pin I32 which is introduced through a suitable bore formed between the pins I28 and passing through the collar I25. Thus it will be seen that when the knob I29 is turned, the extended end portion thereof will turn with respect to the collar. The cam or eccentric of the modified unit is indicated by the numeral I33 and hasthe stem I34 provided with longitudinal flutes I35 upon the end portion thereof which extends into the bore formed longitudinally of the knob I2 9 from the inner end thereof. The knob I29 has extended transversely thereof from the side to the center bore therein, the securing pin I36, the inner end of which engages the flutes I35 to secure the knob upon the stem I34, as shown. Disposed in a suitable recess or socket formed in the collar I25 from the outer side thereof is a spring I3I: andin the outer end of this recess is a ball I38 which is normally pressed outwardly by the spring for engagement in notches I39 formed along a circular linein the inner face of the knob I29; From this, it will be readily apparent that when the knob I29 is turned for the rotation of the cam head I33, the ball I38 will snap from one notch to the other in the knob 129', so as togive an audible signal and if the operator of the device possesses the proper knowledge of the combination, he will know how many clicks must be heard before the barrel securing pin is in the position to which he desires to move it.

Fig. 14 illustrates a slightly modified form of the key operated unit, the modification having to do with the manner in which the barrels and cylinder are retained in assembled relation whereby the necessary rotation 'of the same may be obtained, Since this modification has to do merely with the manner of securing the cylinder and barrels together, reference will be madeonly to the features which are notshown in thecylinders and barrel previously described. The modified cylinder is indicated by the numeral I40. This cylinder together with the associate barrels is 76-, v

made of slightly greater length than the other cylinder and barrels so that there may be provided the encircling grooves I4! adjacent the upper and lower ends thereof which will not interfere with the placing of the necessary openings in the cylinder for the tumbler pins, springs and other parts. The inner barrel is indicated by the numeral I42, and this in addition to having adjacent its upper and lower ends ball receiving grooves 543 which entirely encircle it, is provided with two groups of ball retaining openings which are indicated by the numerals I44, and a stop groove I 45 which is disposed around the barrel substantially midway of its ends. This stop groove corresponds with the groove or slot 63 of the inner barrel 46. The holes I44 of each of the two groups are arranged so that when the cylinder is in the barrel I42, they will be in the plane of the grooves I4i of the cylinder and bearing balls are secured in these holes to project therefrom into the grooves [4i and thus lock the cylinder and inner barrel together.

The outer barrel of the modified key operated unit is indicated by the numeral I46 and this is provided with two groups of ball openings which are indicated by the numerals I47 and which are designed to retain bearing balls so that when the outer barrel is around the inner barrel, the balls retained in these holes or openings will engage in the grooves I43 of the inner barrel and thus lock the inner and outer barrels together. The balls carried by the inner barrel are designated I48 and those carried by the outer barrel are designated I43, the latter balls coupling the inner and outer barrels together and the. first-mentioned balls coupling the inner barrel and cylinder together. In addition to the ball retaining holes I 41, the outer barrel has a middle group of holes indicated by the numeral I49 in each of which a ball I50 is housed for engagement in the stop groove I45 of the inner barrel. These balls I50 are introduced, after the key operated unit has been placed in its chamber in the lock body, through the passage I5! which is formed through the lock body from the bottom of the dove-tail slot which is closed by the sliding panel previously referred to. The wall of the chamber in which the modified key unit is disposed has a ball groove I52 therein so that as each ball is introduced through the passage I5I into a hole I49, it can be turned with the barrels and cylinder in the groove I52 until another hole I49 comes into registry with the passage I5I and in this manner, each of the holes can be supplied with a ball which will be of suflicient size to engage in both the chamber wall groove I52 and the inner barrel stop groove I45.

After the balls have been placed in position, the passage I5I is closed by a plug I53 which has its inner end transversely notched or grooved to correspond with the curvature of the groove I52 and the outer end of this plug has a head I54 which is countersunk in the bottom of the dove-tail slot so that it may be covered and held in place by the sliding plate which is inserted in this slot and which is here indicated by the numeral I55.

Since the key manipulation of the modified unit just described is exactly the same and the other parts are the same as in connection with the first described unit, it is not believed necessary to describe the working of this modified unit.

From the foregoing, it will be readily apparent that the present lock is of particularly novel construction and incapable of being picked, as are other forms of padlocks. With the present lock,

it is not only necessary that the person desiring to open or close the same he possessed of the necessary specially formed key for the shifting of the tumbler pins, but it is necessary also that the possessor of the key have knowledge of the manner in which the controlled knob must be manipulated in order that the barrels may be released for rotation by the key and he must also have knowledge of the particular manner in which the key must first be used in order to release the cylinder from the barrels so that it can be rotated after the key is put into the cylinder in the proper manner. Since the permutation features of the two separately operable units may be changed or made difierent in difierent looks, it will be readily apparent that many combinations may be made up so that no two locks will operate in exactly the same manner.

It has previously been stated that in the construction of different locks, various changes may be made in the positions of the locking pins 5? and 58, and in this connection it is also to be understood that changes may also be made in respect to the relative positions of the other parts such as the tumbler pins, the pins 94 and 95, and other parts, so that a large variety of combinations may be established which will facilitate the making of a correspondingly large number of locks each requiring a particular knowledge for its operation.

What is claimed is:

1. A permutation padlock, comprising a body portion, a shackle having a shank secured in the body portion and adapted for rotary movement and limited longitudinal movement therein, said shackle also including a terminal portion adapted for extension into a receiving bore in the body, a bolt shiftably mounted in the body and adapted for locking engagement with said terminal portion, a tumbler carrying cylinder rotatably mounted in the body and having a key receiving slot, means connected with said bolt whereby the latter may be actuated upon rotation of the cylinder when said tumblers have been shifted to a predetermined position by a key, and a spring controlled retractible locking pin for normally securing said cylinder against rotation and exposed in said key slot to be released by a key before the tumblers of the cylinder are actuated by the key.

2. A permutation padlock, comprising a body portion, a shackle having a shank secured in the body portion and adapted for rotary movement and limited longitudinal movement therein, said shackle also including a terminal portion adapted for extension into a receiving bore in the body, a bolt shiftably mounted in the body and adapted for locking engagement with said terminal portion, a tumbler carrying cylinder rotatably mounted in the body, means connected with said bolt whereby the latter may be actuated upon rotation of the cylinder when said tumblers have been shifted to a predetermined position by a key, a spring controlled mechanism normally securing said cylinder against rotation, and an auxiliary locking mechanism carried by the body for securing the said bolt engaging means against movement.

3. A look of the character described, comprising a body, a shackle having a relatively long shank portion extending into the body and adapted for rotary and longitudinal movement therein, said portion including a terminal portion adapted for introduction into a receiving bore in the body, a bolt shiftably mounted in the body for connection with said terminal portion when the latter is in the bore, a rotary key actuated unit in the body, comprising a barrel and a cylinder within the barrel, means connecting, the barrel with said bolt whereby upon rotation of the barrel the bolt vsn'll be. shifted with respect to said terminal portion, key controlled tumblers carried by said cylinder and adapted when shifted to one position to effect connection of the cylinder with the barrel, and means carried by the body and independent of the key actuated unit for securing said barrel against rotation,

4. A look of the character described, comprising a body, a shackle having a relatively long shank portion extending into the body and adapted for rotary and longitudinal movement therein, said portion including a terminal portion adapted for introduction into a receiving bore in the body, a bolt shiftably mounted in the body for connectionwith said terminal portion when the latter-is in the bore, a rotary key actuated unit in the body, comprising a barrel and. a cylinder within the barrel, means connecting the barrel with said bolt whereby upon rotation of the barrel the bolt will be shifted with respect to said terminal portion, key controlled tumblers carried by said cylinder andadapted when shifted.- to one; position to effect connection of the cylinder with the barrel, means carried by the body and independent of the keyactuated unit for securing said barrel against rotation, said last means comprising a reciprocable pin, and a knob actuated cam for moving said pin into and out of engagement with the barrel.

5. A lock of the character described, comprising a body, a shackle having a relatively long shank portion and a short terminal portion, said shank portion being disposed in a bore in the body and adapted to have both longitudinal and rotary movement. therein, the body having a bore adapted to receive the terminal portion, a bolt reciprocably mounted in the body for engagement with said terminal portion, a key actuated unit rotatably supported within the body and ,having an end exposed through a face of the body, said unit including a central cylinder and an inner and outer barrel, said cylinder. and barrels being disposed one within the other for relative rotary motion on a common axis, key controlled tumblers reciprocably mounted in the cylinder, means facilitating the coupling of the tumblers with the inner barrel and with the outer barrel, and eccentric means. carried by the outer barrel and connected with said bolt for effecting the shifting of the latter upon rotation of the outer barrel. v

6. A look of the character described, comprising a body, a shackle having a long shank portion and a short terminal portion, said shank portion being disposed within the body for rotary and longitudinal movement, said terminal portion being adapted for extension into a bore of the body when the shank is shifted longitudinally in one direction, a bolt member shiftable within the body and adapted to engage said terminal; portion, a barrelrotatably mounted in the body, means connecting one end of the barrel with the bolt whereby the latter may be shifted upon rotation of the barrel, a second barrel within the first barrel,. resilient coupling means between the first and second barrels, a slotted key receiving cylinder'within the second barrel, tumblers carried by and shiftable transversely oi the cylinder for engagement in apertures in the barrels, said barrel apertures being initially out of alinement, necessitating clockwise and anti-clockwise movement of the cylinder andof the second barrel for movement of the tumblers and their connection with the two barrels, and said resilient means being placed under tension upon movement of the second barrel in one direction and adapted to automatically return the said second barrel to its initial position at a point in the manipulation of the lock.

7, A look of the character described, comprising a body, a shackle having a long shank rotatably'and reciprocably mounted in the body and a short terminal portion adapted for longitudinal extension into a bore of the body, a reciproe cable bolt inv the body adapted for connection with said terminal portion, a key operated unit rotatably mounted in the body and comprising an outer barrel, an inner barrel and a cylinder within the inner barrel, means coupling the outer barrel with said bolt for effecting movement of the latter upon rotation of the outer barrel, tumbler pins carried by and movable in apertures extending transversely of the cylinder, apertures in the inner barrel adapted to receive said pins,

apertures in the outer barrel adapted to receive said pins, the apertures ofthe two barrels being out of alinement with one another and with the pins when the lock is in locked condition, and

spring pressed locking pins within 'the body adapted to engage in certain of the apertures of the outer barrel when the lock is in locked condition and to be moved from said apertures by certain of the tumbler pins in the process of opening the lock for the purpose of releasing the outer barrel for rotation. I 8. A look of the character described, comprising a body, a shackle having a long shank rotatably and reciprocably mounted in the body and a short terminal portion adapted for longitudinal extension into a bore of the body, a reciprocable bolt in the body adapted for connection with said terminal portion, a key oper ated unit rotatably mounted in the body and comprising an outer barrel, an inner barrel and a cylinder within the inner barrel, means coupling the outer barrel with said bolt for effecting movement of the latter upon rotation of the outer barrel, tumbler pins carried by and movable in apertures extending transversely of the cylinder,

apertures in the inner barrel adapted'to receive said pins, apertures the outer barrel adapted to receive said pins, the apertures of the two barrels being out of alinement with one anotherand with the pins when the lock is'in locked condition, a member secured to said outer barrel and adapted to be rotated therewith, means normally securing the outer barrel against rotation, and a trigger mechanism normally coupling the said rotary member with saidcylinder and requiring release from the cylinder to permit rotation of the latter before said tumbler pins can be shifted for engagement in the apertures of the barrels, certain'oi said tumbler pins when so shifted, releasing said latching means to permit rotation of the outer barrel;

9. A look of the character described, comprising a. body, a shackle having a long shank rotatably and reciprocably mounted in the body and the inner-barrel; means coupling the outer barrel with said bolt for eifecting movement of the latter upon rotation of the outer barrel, tumbler pins carried by and movable in apertures extending transversely of the cylinder, apertures in the inner barrel adapted to receive said pins, apertures in the outer barrel adapted to receive said pins, the apertures of the two barrels being out of alignment with one another and with the pins when the lock is in locked condition, spring pressed locking pins within the body adapted to engage in certain of the apertures of the outer barrel when the lock is in locked condition and to be moved from said apertures by certain of the tumbler pins in the process of opening the lock for the purpose of releasing the outer barrel for rotation, a latching pin carried by the body and adapted for connection with said barrels to look the same against relative movement and against rotation in the body, and manipulating means for said latching pin by which the latter may be coupled with one or both barrels or completely disengaged from the same as desired.

10. A look of the character described, comprising a body, a shackle having a long shank extended into the body and adapted for both rotary and longitudinal movement therein, and a terminal portion adapted for longitudinal movement into a bore of the body, a bolt recip-rocably mounted in the body for engagement with said terminal portion, a key manipulated unit comprising an outer barrel rotatably disposed in the body, an inner barrel rotatable within the outer barrel, and a cylinder rotatable within the inner barrel, said inner and outer barrels having alined partial circumferential slots, a pin carried by the body and engaging in said slots, means coupling the inner barrel and cylinder permitting relative rotation of the same without longitudinal movement, eccentric means coupling one end of the outer barrel with said bolt, spring pressed latch pins carried by the body and engageable in a pair of alineable apertures in the barrels, said barrels having tumbler apertures adapted to be brought into alined relation, said latter apertures being out of alinement with one another when said latch means is engaging the barrels, tumbler pins mounted for reciprocation in transverse passages in the cylinder, said cylinder having a key receiving slot into which the tumbler pins project, said cylinder when moved to one position bringing one of the tumbler pins in alinement with said latching pins and bringing a tumbler pin in alinement with an aperture of the inner barrel whereby projection of the said pins will release the latching means and couple the cylinder and inner barrel together, and said cylinder and inner barrel when rotated to a sec ond position bringing a tumbler pin into aline ment with an aperture of the outer barrel whereby the latter tumbler may be further extended to couple the barrels for unitary rotation.

11. A look of the character described, comprising a body, a shackle having an elongated shank extending into a bore of the body and adapted for rotary and longitudinal movement therein, the shackle having a terminal portion extensible longitudinally into a second bore of the body, a shiftable bolt in the body engageable with said terminal portion, a key operated unit in the body, comprising an outer rotatable barrel, an inner rotatable barrel and a cylinder rotatable in the inner barrel, eccentric means coupling the inner end of the outer barrel with said bolt to effect shifting of the bolt upon rotation of the outer barrel, a spring coupling between the inner end of the inner barrel and the outer barrel, said cylinder having a longitudinal key receiving slot opening from an end of the cylinder through a side of the body, tumbler pins reciprocably mounted in passages extending transversely of the cylinder, the pins being engageable by a key inserted in the slot, normally misalined apertures in the barrels, said apertures being designed to be brought into alined relation with one another and with said pins upon manipulation of the cylinder and inner barrel, latching means normally holding the inner and outer barrels against rotation, one of said tumbler pins upon initial movement effecting the release of said latching means and the coupling of the cylinder and inner barrel together whereby their subsequent concerted rotation to a subsequent Working position will place said spring under tension, the movement of the cylinder and inner barrel to said subsequent position alining a pin with an aperture in the outer barrel for projection thereinto by a key whereby the entire unit may be turned to retract the bolt, the tensione-d spring reacting upon removal of the key to return the inner barrel to its initial position for engagement by said latching means.

12. A lock of the character described, comprising a body, a shackle having a long shank portion and a short terminal portion, said shank portion being disposed in a bore of the body for rotary and longitudinal movement therein, the body having a bore adapted to receive the terminal portion, a terminal portion engaging bolt shiftably mounted within the body, a key actuated unit within the body consisting of a rotary outer barrel, a rotary inner barrel within the outer barrel and a rotary cylinder within the inner barrel, said cylinder having a key receiving slot opening through a face of the body, tumbler pins carried by the cylinder for movement transversely thereof, the pins extending into the slot, said barrels having tumbler receiving apertures adapted to be brought into alined relation upon manipulation of the cylinder and inner barrel to facilitate projection of the pins thereinto for locking the barrels and cylinder together, a spring pressed latch pin in the body normally engaging in an aperture of the outer barrel and ejected therefrom upon projection of a pin into the aperture, a spring pressed trigger pin normally coupling the cylinder and an outer barrel together, means for eiiecting shifting of the trigger pin from within the key slot to release the cylinder for independent rotation, and said bar role and cylinder when coupled together by the pins being rotatable as a unit to eifect shifting of said bolt.

13. A look of the character described, comprising a body, a shackle having a long shank portion and a short terminal portion, said shank portion being disposed in a bore of the body for rotary and longitudinal movement therein, the body having a bore adapted to receive the terminal portion, a terminal portion engaging bolt shiftably mounted within the body, a key actuated unit within the body consisting of a rotary outer barrel, a rotary inner barrel within the outer barrel and a rotaiy cylinder within the inner barrel, said cylinder having a key receiving slot opening through a face of the body tumbler pins carried by the cylinder for movement transversely thereof, the pins extending into the slot, said barrels having tumbler receiving apertures adapted to be brought into alined relation upon manipulation of the cylinder and inner barrel to facili- "aperturein the, adjacent end of the" cylinder,

m alinement with ncies oflthe inner barrel for et ete tion of the st er ini r loflking the barrels and cylinder-together, aspring pressed latch pin in the body normally engaging in an aperture of; the outer barrel and ejected there from upon projection ofa pininto the aperture,

a spring pressed trigger pin normally coupling the cylinder and outer barrel together, means for efiecting a shifting of--the trigger pin from within the key slot to release the cylinder for in- :dependent rotation; a barrel locking pin reciprocablymounted within the body and adapted when in one position to engage only the outer barrel. and.v when in. a second position to engage both barrels and in a third position to be free of both'barrels, means upon the outer side of the body for effecting shifting of said pin to said positions, andv said barrels and cylinder when coupled together by'the firstrmentioned pins and when free 'of connection withsaid latching pin,

I being rotatable as a unit'for. the shifting of said bolt. v

14, A lock of the character described, comprising a body, a key operated unit within the body, comprising anouter barrel rotatable in the body, an inner barrel rotatable in the outer barrel and a cylinder rotatable in the inner barrel, a finger extending longitudinally from an end of the outerbarreland disposed eccentrically to the axis of; rotation of theouter barrel and adapted for engagement with and the control of' a bolt,

said cylinder having 'a key receiving slot opening through one end and extending longitudinally thereof and accessiblefrom the exterior oi the body, key controlled shiftable tumbler pinsadapted for movem-ent tr'ansversely of and within the means 'accessible from within the key slot for shifting saidpin meanstodisconnect the cylinder from the washer whereby the cylinder may be turn-ed to a position to bring certain of the'pins' projection. thereinto, the reverse rotation of the cylinder carrying the inner barrel to a position alining said holes, and pins with holes in the outer barrel for the projection of the pins thereinto to couplethebarrelsand cylinder. together for the rotation of the outer barrel and said finger; V A lock oi thecharacter. described,'coniprisin albody a key ate s mt W th n the' d comprising, an outer barrel rotatable in the body, an inner barrel rotatable in the outer barrel and acylinder rotatable in the inner barrel, a finger extending longitudinally from an end of the outer barrel and disposed'eccentrically to the axis of rotation of the outer barrel and adapted for engagement with and the control of a bolt, said cylinder having a key receiving slot opening through one end and extending longitudinally tumbler pin receiving holes in the outer barrel and normally out of alinement with the holes of the inner barrel, a washer encircling the outer end of the cylinder and secured to the outer end of the outer barrel, spring pressed pin means reciprocable in said washer andengageable in an aperture in the adjacent end of the cylinder, means accessible from Within the key slot for shifting said pin means to disconnectthe cylinder from the washer whereby the cylinder may be turned to a position to bring certain of the pins in alinement with holes of the inner barrel for projection thereinto, the reverse rotation of the cylinder carrying the, inner barrel to a position alining said holes and pins with holes in the outer barrel for the projection of the pins thereinto tocouple the barrels'and cylinder together for the rotation of the outer barrel and said, finger, and a spring pressed pin within the body,

normally engaged in a hole of the outer barrel and ejected from said hole upon the projection of a pin thereinto.

' 16. In a lock having a body and a shackle provided with an elongated shank extensible into a hereof the body" and means" for securing the shackle to the body when the shank is projected thereinto, coupling means'between the shank and the body comprising a pin member extending transversely through'the body across the shank and through a recess formed across the side of the shank and extending throughout a major portion of the length thereof, said shank having a longitudinal bore opening through the end, a compression spring housed'within said bore of the shank and 'having'an'end extending into the bore of the body in which the shank is positioned, and a plate forming a removable portion of the shankand extending from; the inner end thereof throughout a substantial portion of the length of the same, said plate having a transverse groove alining' with a groove formed'circumferentially of the shank and entering'said recess adjacent the end of the shank, and a pin securing said plate to the shank; said'platebeing upon the shank diametrically opposite from saidrecess.

MANUEL? QUIIFTAL-

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