US2449711A - Door lock - Google Patents

Description

Sept. 21, ms. M L GAN 2,449,711

DOOR LOCK s Shets-Sheet 1 Filed May 24, 1945 s 4 9 rrw w :u 3 W e 4 M W 5 d 8 w w s 1 6% 5 9 w M 6 syv 0 4 J6 a w 9 7 e. w e\ a. e a wa a wow 9 \h, w a $4 a Sept. 1, 1948. I J. H. MELLIGAN 294495711 DOOR LOCK Filed May 24, 1945 3 Sheets-Sheet 2 1520882308 Jwefiza 9 H M Jam. 3308 3289 Sept- 19480 J. H. MILLIGAN 2,44%?M DOOR LOCK Filed May 24, 1945 www 3 Sheets-Sheet 5 Patented Sept. 21, 1948 W t ST ii ii 1 This invention relates to door locks and especially to'that'type of door lock in which one of the door knobs, usuallythe outer door-knob, has a lockmech'anisni incorporated therein and- 1s normally locked irom turning movement but can 5 be unlocked by means of a key so that it can be I turnedto withdraw the door latch when the door is to be opened. In doorshaving door knobs for opening the door the two knobs are commonly mounted fona fiat sided spindle which extends through the door and which carries a collar having arms that cooperate with fingers with'which the'door latch is provided, so that when either knob is turned the resultantturningmovernent of the spindle operates to withdraw the door latch. I

It is one of the objects of my present invention to provide a novel door lock of theabovementioned'type which can be readily substituted for 'theordinary pair of knobs and spindle 'of any doorwithout-making any important alteration in the door itself, whereby" a door which is provided withdoo'r-knobs but not provided witha lock can be easily converted into a door having a door lock which can beu'nlo'cked by'the use ofakeyJ Ahotherob'ject' of the invention isto provide a door lock of this type with means by which a person on the-inside of the door mayset the lock in the'nutside knob so that turning movement of said" outsideknob will be inefiec'tive to withdraw the door latch, thereby making it impossible for a-person on the outside to open the door even though he has the proper key. A further object of the invention is to provide a novel means whereby the lock can be set from the outsideso that the outside knob will'remain unlocked and can, therefore, be turned to withdraw the door latch without the use of'a-key.

Further objects of the invention are to provide various novelffea'tures relating to door locks o f this type whichvrill be more fullyhereinaftr setforth andjthen pointed out in theclaims;

In the drawings wherein I have illustrated a selectedembodiment of my invention, fl 'ig. 1 is a fragmentary section of a door having a door latch and showing theoutside knob in end 1 I f I y: Fig. 2 is a section on the line 22, Fig. 1; Fig; 3 is asection on the line 3---3,Fig. 1. Fig. 4 is a section on the line 4-4, Fig. 1. Fig. 5-isasection on substantially the line 55, Fig.2;

Fig. 6 is a section on the line 6-6, Fig. 7. Fig. 7 is a section on the line 1-4;, Fig. .2.

Fig. 8 is a section on the line 8-8, Fig. 2. Fig. 9 is asection on the line 9-43,. Fig. 3. I Fig. l0-is a perspective view of the knob-supporting member 'for the outer knob. Fig, l l is a longitudinal section through the knob-supporting member. I

11 clams. (Cl. 70- 215) 'efthe door is Fig. 12 is a sectional view on the line 33, Fig. 1 showing the position. offthe parts when the spincllehas beenvun'clutchedfrom the outer knob. i vFig; 13 is a perspective view of' the plate secured to'the inner knob:andwhichforms part ofzthe means for unclutching thespindle' from the outer knob when the inner knob is turned. 1 .5 1 Figzl l is' :apersp'ective viewof the supporting member carried "by'rthe spindle on which the inner knob is mounted: r

Figsfi15 and '17 are fragmentary sectional views illustrating the part'sr for unclutching'thespindie from: theouter knob when the inneru'knob is turned. r I

Fig. 16 is a section on the line lfilti, Fig. 12.

Fig. 18 is a fragmentary sectionalvie'w showing the'means-for returningvthe'outer knob :to its central position. i v -In:athe drawings -I indicates a portion of a door which is'equipped with the usual springpressed door latch 2, the latter having a body portion-s whichrisreceived withina housing i that'is setintoa recess 5. with which the :door is provided; the fronttplate- 6- ofthe housing having an zopen-ingithrough; which thenose'l of the door latch projects. -The bodyof thedoorlatch is providedwith two rearwardly extending arms 3 having at-their ends:inturnedfingers il -that co-operatewith arms it stormed on a collar: :1 i .that.is-provided with" a squarehole andis mounted on the square spindle of theldoor knob structureso-thatwhen either knob is turned, the resultant turning movementto-f the spindle .will turnttheueollar fll [and will, through the co-soperation of either arm it; and its co-operating finger 9,. withdrawthe door latch 2 againstthe action of a springsllz which normally holds: the latch yieldingly. in its projectedposition.

fi his typev oidoorlatch isione which is com" 1 only .used..- As stated above my invention in- 1 es apaiiwof knobs. having a door lock incorporated therein and a spindle associated therewith. which knobsandspindle can .be substituted an ondinary pair of knobszin adoor having t 1 door lat-ch aboveudescribed; thereby convertthe door into one .whichcanbe locked and ich requiresthe use lofiakey for unlocking it. device herein illustrated the outside knob v indicated at .13, and the. inside knob at i i. These two, knobs are connected by square sided spindle l5 .whichextehds. through the door'andgthrough the quare opening in the collar H.

The outside knob 13 is mounted on a stationary knob supporting meniber it. which i-s stationarily secured to the door 1'. This knob-supporting member has an inner portion ll of large diam-- 'eter and an outer'portion it of smaller. diameter. The knob-supporting member may be stationarily attachedto'ithedoor l "in any approved way.

As herein shown the inner end of the knob-supporting member has secured thereto by means of screws i9 an attaching disk which is provided with two attaching lugs 2|. Secured to the door I by means of screws 22 is an anchoring plate 23 that is provided on its outer face with a recess 24 adapted to receive the attaching disk 23. ihe anchoring disk 23 is provided with two openings 25 adapted to receive the studs 2 I, each stud being cut away on one side to provide a notch 26. In securing the knob-supporting member it to the door, the studs 2| are entered through the openings 25 in the anchoring plate 23 and then the knob-supporting member is turned slightly about its axis to bring the edges of the openings 25 into the notches 26, and thereby the knob-supporting member will be firmly secured to the anchoring plate 23. The door itself may be provided with a recess 21 to accommodate the inner ends of the studs 2| as shown in Fi 4.

The attaching plate 20 is provided with a radially extending spring-pressed locking pin 28 which is backed by a spring 29 and which is adapted to enter a recess 30 with which the anchoring plate 23 is provided, thereby locking the knob-supporting member l6 from turning movement after it has been properly assembled with the anchoring plate 23. The flange of the outer knob that encloses the attaching plate 20 is provided with an aperture 3| through which a wire may be inserted to disengage the locking pin28 from the reces 30 when it is desired to remove the knob-supporting member l6 and the outer knob f3. 7

The outside knob I3 is provided with a central cylindrical chamber 32 having a diameter the same as that of the larger portion H of the knobsupporting member l6, which larger portion occupies the inner end of said chamber 32. Situated within the chamber 32 at the outer end of the knob is a barrel element 33 which is provided with a central opening 34 of a size to fit the smaller portion I8 of the knob-supporting member. This barrel element 33 is secured in place by means of a screw I34 whichextends through the barrel from the inner end, and the outer end ofwhich screw has screw-threaded engagement with a, nut 35 carired by the knob. The barrel element 33 is thus rigidly secured to the knob and practically forms a part thereof.

The outside knob I3 is connected to the spindle l5 through themedium of a clutch device which is normally engaged but which can be disengaged from the inside of the room, as will be presently described.

The outer end of the spindle i5 is formed with a flange 33 that is received in an axial recess with which the knob-supporting member I6 is provided. Projecting from the flange 36 are two pins 31 which extend through a clutch flange 38 that is also received in said recess 40. The clutch flange 38 has a clutch pin 39 extending outwardly therefrom which passes through an arcuate opening 90 formed in the larger portion I! of the knob-supporting member l6 and the extremity of which is adapted to engage in a clutch recess M with which the inner face of the barrel member 33 is provided. When the parts are in their operative position shown in Figs. 2 and 3 with the clutch pin 39 occupying the recess 4!, turning movement of the knob l3 on the knob-supporting member will operate through the clutch pin 39, clutch disk 38, pins 31 and flange 36 to turn, the

For this purpose the barrel element 4 fiat sided spindle l5, thereby to turn the collar II and withdraw the door latch 2.

The outer knob i3 is normally locked to the stationaryknob-supporting member l3 so that the knob cannot be turned, but the knob can be unlocked from said knob-supporting member to permit it to be turned by means of a suitable key. 33 is provided with a radial opening 43 into which is received a radially extending locking pin 42 that is backed by a spring 44. The inner end of this locking pin 42 is adapted to engage in a recess 65 with which the portion l8 of the knob-supporting member is provided, and when the locking pin is in its normal position shown in Figs. 2 and 7, the knob 13 will be locked from turning movement.

The barrel element 33 is provided with an opening in which is received a key plug 46 having a key slot 41 therein. Said plug and barrel element are provided with the usual set of tumbler and follower pins (not shown) which normally lock the plug' 43 from turning movement but which become lined up to free the plug when a key is inserted into a key slot 41 as usual in socalled Yale locks.

Y The plug 46 is provided on one side with a shoulder 48 adapted to engage the inner end of a pin 49 that is slidably mounted in the barrel element 33. The locking pin 42 is formed at its outer end with a head 50 having a portion overlying the pin 49.

When a proper key is inserted into the key slot 41 thertumbler and follower pins will be lined up and the plug 46 will be freed for turning movement. The turning of the plug by the key in a counterclockwise direction, Fig. 7, will operate through the shoulder 48 to raise the pin 49 and thereby lift the locking pin 42 against the action of its spring 44 and out of engagement with the portion l8 of the knob-supporting member, thereby unlocking the knob and freeing it for turning movement. When the knob is thus unlocked, the turning movement thereof will operate through the clutch pin 39, clutch disk 38, pins 31 and flange 36 to turn the spindle l5 and thereby withdraw the door latch 2. With my improvement the outer knob of the door will be normally locked so that it cannot be actuated but it can be unlocked by means of a suitable key to permit it to be turned and thereby to withdraw the door latch.

The inner knob 14 is so constructed that it can be operated to turn the spindle l5 and thus withdraw the door latch 2 even though the outer knob is locked, so that a person on the inside of the room can always open the door.

For this purpose means are provided whereby an initial turning movement of the inner knob 14 will disengage the clutch pin 39 from its socket 4| in the outer knob, thus freeing the spindle from the outer knob so it is free to turn, and further turning movement of the inner knob will then rotate the spindle [5 to withdraw the door latch 2.

Secured to the inner end of the spindle I5 is a supporting collar 5| which is inserted in a chamber 52 with which the inner knob M is provided, said collar 5| being secured to the spindle 15 by means of a suitable set screw 53. a

The clutch disk 38 carrying the clutch pin 33 is mounted on the end of a stem 54 which extends through an axial bore 55 with which the spindle is is provided. The outer end of this bore is enlarged and receives a spring 56 which 5 acts against the clutch disk 38 and normally holds it in itsoperati-ve clutchin position. i

The supporting collar 5| is providedwith .a plurality of through openings 53 extending parallel to the spindle, in each of which openings is received a thrust pin 5?. The inner end of each opening 58 is counterbored, land the inner .end of each thrust pin isenlarged to lit the counterbore as shown .at 59. Situated .in each counterbore is-a splll'iglfiflwhich normallytends to hold the thrust pin in its :forward or inward position. 'The inner enlarged end 59 of each thrust pin is cone-shaped and is normally re ceived in a'vnotch 5| formed in aplate 62 which is secured to theinner face of the inner knob M by suitable'screws 99.

The plate .62 is provided with a boss es in the face of which the V notches'iil are formed. This boss is cut. away at M to provide a space'bounded by the two abutment walls 95 in which is receivedta projection 93 extending from the inner endof the supporting collar 56. The space betweenithe abutmentwalls 9 5 is somewhat greater than'the widthtof the projection'dfi, thereby providing a certain amount of loose play between the projection and the abutment walls '55, the purpose of which will'be presently described.

The stemtild extends-through and beyond the end of the'spindle, saidprojecting portion of the stem being screw threaded and having screw threaded .theretoa thrust collar :63 whichfits the chamber-:52 of the nknobil l and isbacked by a suitablespring 6 8. The spring t l yieldingly holds the thrust collar 63 in engagement with the outer face'of the supporting collar 5! as shownrin Figs. 2 and 3. The thrust collar $3 is shown as having a reducedfinner endfiii which fits within an axial recessin the outer end of the supporting collar 5 l Figs. 2 and 3 show the knobs l4 and the parts therein in normal position with the thrust collar 63 in engagement with the outer face of/the supporting collar. iii and with the-inner pointed ends of the thrust pins 5? occupying the notches 6|.

With the parts in this position the clutch pin Zia-will be in engagement with the notchd t in the knob-supporting member to, and thespindle l5 and the supporting collars! which is mounted thereon will thus be locked'from turning movement.

"When the inner knob id is turned. this turning movement is communicated to the plate 62 which is secured to the knob,and during the initial turningmovementof the plate 62 the faces of the V-notch'es 6i will'have a carnming action against the pointed ends'of the'thrust pins 5? and will thus force them backwardly, it being understood that the spindle fi l, and consequently the supporting collar 5!, is stationary at this time. This backward movement offthe thrust pins is communicated tothe thrust collar'fi's which-isscrew threaded to the stem 5% and thus the thrust collar'and stem will-be moved to the right in Figs. 2 audit, thereby moving the clutch collar 38 to the right and withdrawing the clutch pin 39 from its socket Mas shown in Fig-12. By this operation the spindle i5 is unclutched from the outer knob.

-The-lost motion between the projection Qdand the abutment walls 95 permits this initial turning movementof the knob it while the spindleis still locked from turning movement. By the time the'knob has been turned to'bring one ofthe walls 95into-engagement'with the projection ilti on thesupportingcollar .51, the spindle will have been unclutched from the outer knob 13 and fur ther turning movement of the inner knob I4 will operate through the engagement of one of the abutment walls 95 with the projection 9b to turn the spindle 15 and thereby withdraw the door latch 2.

When the-inner knob :14 has been released and has beenireturned to its normal central position, the springs as and t5 co-operate {to return the clutch disk 33 to its normal operative position shown incFig. 3, thereby again clutching the outer knob "l31to the spindle 55. When the inner knob has again resumed its normal central position, the thrust pins '51 will be in line with the V notches *6! and the springs 6d will restore said thrust pins into their normal position shown in Fig.2.

Ihave provided herein means for automatically returning the knob M to its normal position after it --has;been :turned to retractlthe door latch and hasbeen released. l'ihe plate-E2 is provided with a projection '66 which .is located between two spring-pressed followers til carried by the rose it. This rose is provided with an arcuate slot lid in which is received a return spring 7d, the ends of which abut against the two followers bl. Said rose is also formed with two stops ll to limit the spring-pressed movement of the followers.

When the inner knob M is turned in either direction,-the projection 66 will engage one of the followers and will thus compress the spring it? so that when the knob is released the expanding action of the spring will return it to itsnormal position.

"My improved lock is also provided with means whereby a person on the inside of the door can disengage-the clutch pin from its socket ti andlock the clutch in its disengaged condition, thereby making it impossible for anyone toopen the door from the outside even though he has the properikey. Screw threaded to the end of the stemjfit is a nut l5 having a head portion "is which'projects beyond the knob it so that a person can readily grasp said nut. By pulling b-ackwardly on the nut, the stem at and clutch disk 38 is moved to the right, 1 and 2, therebydisconnecting the-clutch pin ts from its socket ll.

The knob M is provided with a spring-pressed locking pin Ti which-engages the nut l5 and the latter is formed with a recess it in one side at i-tsinner-end adapted to receive the locking pin ll when the knob is pulled inwardly as shown in Fig. 12. Whena person on the inside of the room desires to make it impossible for a person to; enter the room from the outside, he will pull outwardly on the nut iii, thus disengaging the clutch pin dt from its socket ll and when the nut FE-has been thus withdrawn, the locking pin 'll snaps'into the recess l8, thereby locking the stem andthe clutch disk 36, in their retracted position. So long as the clutch pin remains in its retracted position, the outer knob It will be disengaged from the spindle l5 so that even if a person unlocks the outer knob l 3 with the proper key, yet the turning movement of the unlocked knob willnot be communicated to the spindle and the knob will simply turn freely on the knobsupporting member l6.

The side walls of the notch or recess 78 are inclined so that if the inner knob M is turned whilezthelocking pinl'i is occupying the notch 78, the inclined side faces of the notch will cam the locking pin ll backwardly, thereby releasing the nut 15 andallowing the stem 54'with its clutch disk 38 to move back into its normal operative position under the influence of springs 56 and 54.

I have also provided herein means whereby a person on the outside of the door can set the lock for the outside knob l 3 in an inoperative position so that a person can turn the outside knob l3 to open the door without the use of a key. Slidably mounted in the outer knob 13 is a plunger 80 from which extends an arm 8| having at its end an inclined face 82 that is adapted to engage the underside of the head 50 of the locking stem 42 when the plunger 80 is pushed inwardly, thereby holding said head 50 raised. When therefore the head 58 has been raised by inserting a key in the key slot 31 and turning the plug 46, thus unlocking the outside knob i3, and said plunger 88 is pushed inwardly to move the face 82 of the arm 8! underneath the raised head 5!), said arm ill will hold the head 5!] raised and thus hold the outer knob in an unlocked condition. The plunger 8D is provided with two notches 83 which cooperate with a spring-pressed locking pin 84 to retain said plunger in either its normal or its inward position.

The knob 53 is also provided with a restoring plunger 85 which is situated at right angles to the plunger 88 and which is constructed so that when the restoring plunger is pushed downwardly it will restore the plunger 88 to its normal position. The restoring plunger 85 is normally held in its raised position by means of a spring 86, and the construction is such that when the restoring plunger 85 is depressed, it will engage the cam face 96 on the plunger 80 and will move the latter backwardly into its normal position.

Whenever it is desired to leave the door unlocked so that it can be opened without the use of a key, the plunger so will be pushed inwardly, thereby raising the locking pin 42 out of engagement with the portion iii of the knob-supporting member, and so long as the plunger 80 remains in its inward position, the knob will remain unlocked so that the door can be opened from the outside without the use of a key.

By simply depressing the restoring plunger 85 the plunger 88 will be restored to its normal position, thus allowing the spring 44 to return the locking pin 42 to its locking position.

In Fig. 18 I have shown means which may be employed for returning the outer knob to its central position after it has been turned. For this purpose, the outer knob i3 is provided on its inner face with a projection 88 which enters an annular groove 81 formed in the attaching plate 2311 which is secured to the door I. Located within this annular groove BI is a spring 90, the ends of which engage two followers 89 between which the projection 88 is located. The attaching plate 23a is shown as provided with two stop shoulders ll which limit the spring impelled movement of the followers 89.

When the knob I3 is turned in either direction, the projection 88 thereon will engage one of the followers and will thus compress the spring 99 so that when the knob is released, the expanding action of the spring 98 will return said knob to its initial or central position.

I claim:

1. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on saidknobsupporting member, a key-actuated locking means for normally locking the outer knob to the knob-supporting member, a latch-actuating spindle adapted to extend through the door and to be operatively coupled to the door latch, means separate from said key-actuated locking means for normally connecting the spindle to the outer door knob, whereby turning movement of the kob when unlocked will turn the spindle, an inner door knob mounted on and connected to the spindle on the inside of the door and by which'the spindle may be turned, and means operative from the inside of the door to disconnect said spindle from the outer knob thereby releasing said spindle for turning movement by the turning movement of the inner knob and simultaneously rendering the outer knob, when unlocked, ineffective to turn the spindle.

2. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knob-supporting member, a key-actuated locking means for normally locking the outer knob to the knob-supporting member, a latch-actuating spindle adapted to extend through the door and to be operatively coupled to the door latch, means separate from said key-actuated locking means for normally connecting the spindle to the outer door knob, whereby turning movement of the outer knob when unlocked will turn the spindle, an inner door knob mounted on and connected to the spindle on the inside of the door and by which the spindle may be turned, means operative from the inside of the door to disconnect said spindle from the outer knob thereby releasing said spindle for turning movement by the turning of the inner knob and simultaneously rendering the outer knob, when unlocked, ineffective to turn the spindle, and means to lock the spindle so disconnected.

3. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knobsupporting member, a key-actuated locking means normally locking the outer knob to the knob-supporting member, a latch-actuating spindle adapted to extend through the door and to be operatively coupled to the door latch, a clutch device separate from said key-actuated locking means for normally connecting the spindle to the outer knob, whereby turning movement of the outer knob when unlocked will turn the spindle, an inner door knob mounted on the spindle on the inside of the door, and means operative from the inner knob to disconnect said clutch device, thereby releasing the spindle for turning movement by the turning of the inner knob and simultaneously rendering the outer knob, when unlocked, ineffective to turn the spindle.

4. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knob supporting member and provided with a key slot, means normally locking the outer knob to the knob-supporting member, means actuated by a key inserted into the key slot to unlock the outer knob from the knob-supporting member, a latchactuating spindle adapted to extend through the door and to be operatively coupled to the door latch, means normally coupling said spindle to the outer knob, whereby turning movement of the unlocked outer knob will turn the spindle and thereby unlatch the door, an inner knob mounted on the spindle n the inside of the door and free for limited turning movement relative to the spindle, and means rendered operative by such limited turning movement of the inner knob to uncouple the spindle from the locked outer knob thereby releasing said spindle for turning movement by the continued turning of the inner knob.

5. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means statlonarily securing said member to the outside of the door, an outer knob mounted on said knobsupporting member and provided With a key slot, means normally locking the outer knob to the knob-supporting member, means actuated by a key inserted into the key slot to unlock the outer knob from the knob-supporting member, a latchactuating spindle adapted to extend through the door, a clutch normally connecting the spindle to the outer knob, whereby turning movement of the unlocked outer knob will turn the spindle and thereby unlatch the door said clutch including a clutch pin associated with the spindle and a pin-receiving recess with which said outer knob is provided, an inner knob mounted on the spindle on the inside of the door and free for limited turning movement relative to said spindle, and means rendered operative by such limited turning movement of the inner knob to Withdraw the clutch pin from said recess and thereby release the spindle from the locked outer knob and free it to be turned by the inner knob.

6. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knob-supporting member and provided with a key slot, means normally locking the outer knob to the knob-supporting member, means actuated by a key inserted into the key slot to unlock the outer knob from the knob-supporting member, a latch-actuating spindle adapted to extend through the door and to be operatively coupled to the door latch, means normally coupling said spindle to the outer knob, whereby turning movement of the unlocked outer knob Will turn the spindle and thus unlatch the door, an inner knob mounted on the spindle on the inside of the door and free for a limited turning movement relative to the spindle, and means rendered operative by the initial turning movement of the inner knob to disconnect the spindle from the locked outer knob thereby releasing said spindle for turning movement by further turning movement of the inner knob.

7. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knobsupporting member, releasable locking means normally locking said outer knob to the knobsupporting member, a latch-actuating spindle adapted to extend through the door, said spindle having an axial bore, an inner knob mounted on said spindle, a clutch element associated with and operative when the latter said spindle for turning movement therewith and normally having clutching engagement with the outer knob, a rod extending through the axial bore of the spindle and connected to said clutch element, said rod being operatable from the inside of the door to disengage the clutch element from clutching engagement with the locked outer knob, thereby releasing the spindle for turning movement by the inner knob and simultaneously rendering the outer knob, when unlocked, ineiTective to turn the spindle.

8. A door knob structure as described in claim 7 combined with latching means carried by the inner knob and co-operating with said rod to hold the clutch element disengaged.

9. A door knob structure as in claim 7 com-- bined with latching means carried by the inner knob and co-operating With the rod to hold the clutch element disengaged, and means to release the clutching means by turning movement of the inner knob.

10. A door knob structure for a door having the usual door latch, said door knob structure com-- prising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knob" supporting member, a latch-actuating spindle coupled to the outer knob and adapted to ex tend through the door and to be operatively connected to the door latch, locking means normally locking said outer knob to the knob-supporting member, key-actuated means to release said loclring means, a depressible plunger carried by the outer knob, means associated with said plunger is depressed to hold said locking means in released condition, and an inner knob mounted on said spindle on the inside of the door.

11. A door knob structure for a door having the usual door latch, said door knob structure comprising a knob-supporting member, means stationarily securing said member to the outside of the door, an outer knob mounted on said knob supporting member, a latch-actuating spindle coupled to the outer knob and adapted to extend through the door and to be operatively connected to the door latch, locking means normally locking said outer knob to the knob-supporting member, key-actuated means to release said locking means, a depressible plunger carried by the outer knob, means associated With said plunger and operative When the latter is depressed to hold said locking means in released condition, an inner knob mounted on said spindle on the inside of the door, a second depressible plunger carried by the outer knob, and means actuated by the depression thereof to restore the first-named plunger to normal position.

JOSEPH I-I. MILLIGAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 842,834 Hurdle Jan. 29, 1807 868,782 Hiltpold Oct. 22, 1907 1,576,574 Claussen Mar. 16, 1926 1,755,434 Ellingson Apr. 22, 1930 1,804,482 Reif May 12, 1931 1,919,750 Rymer July 25, 1933 2,018,093 Schlage Oct. 22, 1935 2,207,143 Brauning July 9, 1940 2,282,213 Rolph May 5, 1942

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