US589576A - Lubricating twist-drill - Google Patents

Description

Pa/ented Sept. 7,1897.

W. J. RICKEY.

LUBRIGATING TWIST DRILL.

(No Model.)

Mai/'1.665 e3;-

, UNITED STATESPATENT trice.

WALTER J. RICKEY, OF DANBURY, CONNECTICUT, ASSIGNOR TO THE T. t B. TOOL COMPANY, OF SAME PLACE AND PORTLAND, MATNE.

LUBRICATING .TWIST-DRILL.

SPECIFICATION forming part of Letters Patent No. 589,576, dated September 7, 189'?.

Application tiled February Z0, 1897. Serial No. 624,380. (No model.)

To all whom c may concern: eline toward each other and toward the axis Be it known that I, XVALTER J. RIUKEY, a of the rod, as shown in Fig. l. A line 3 is citizen of the United States, residing at Danusually scored on the surface of the rod thus bury, in the county of Fairfield and State of bored just outside of and parallel with one 55 5 Connecticut, have invented certain new and or both of Athe passages, as indicated in Fig. 2. useful Improvements. in Lubricating Twist- This scored blank is then heated and while Drills, of which the following is a speciiicahot one end is held and the other end twisted tion. until the passages assume the spiral of the The invention relates lo those twist-drills lands that will remain after the grooves have 6o ro that have internal passages through which been formed. The spiral of the lands being lubricatingmaterial maybe forced tothe cutknown the necessary twist to give the pasting-lips for washing out the chips and consages the proper spiral is readily determined ducting away the heat incident to drilling and by the positions of the lines These lines for otherwise aiding the cutting action of thel being on the surfaces directly outside of thev 6 5 drill and prolonging its life. passages the heated blank is twisted until The object is to provide an attractive apthe lines occupy positions which will be pracpearing and inexpensive drill ot' this class tically the middle of the lands to be formed. which will be strong, durable, and very efii- Any common shank 4 may then be formed, cient. and this shank is usually bored to provide a 7o 2o The invention resides in a twistdrill having chamber 5, into which the passages Q may lead.

a common cutting-point and holding-shank, After the body of this twisted blank, as illusa strong web and ordinary spiral grooves, and trated in Fig. 3, has been turned to about the lands between the point and shank, with spisize of the completed drill grooves t, of any ral passages in the solid metal beneath the approvedshape, maybe milled or otherwise 75 25 surfaces of the spiral lands, as more particuformed on the desired pitch between the paslarly hereinafter described, and pointed ont sages. The pitch of the grooves maybe either in the claims. constant or increased, according as the pas- On the accompanying'sheet of drawings, sages have been twisted, which passages are. which illustrate an embodiment of the inventhus left in the solid body of the lands 7 be- 8o 5ction and the method of producing the same, tween the grooves. The blank is then by any Figure l is a view of a rod with two perforacommon means given the desired point and tions and illustrates the blank at one period cleared and sharpened in the usual manner. during the process of making a drill, which The grooves are preferably formed in such embodies the invention. Fig. 2 is a view of manner as to'leave a web of'increasing thick- 85 35 the same rod rotated ninety degrees. Fig. 3 ness from point to shank, and the passages is a view of the blank after other operations are located far enough from the axis of the of the process of manufacture have been perdrill to leave a strong web and yet not be formed. Fig. e is a view of a completed drill suflicientl y near the surfaces to weaken the made from this blank; and Fig. 5 shows a lands or the cutting edges. lt is preferred 9o 4o view lof the shank end, atransverse sectional that the passages incline toward each other view, and a view looking at the point of the from the point to the shank in order that of the drill shown in Fig. 4:. they maybe in the heaviest part of the lands, In the process of making a drill which emaway from the web near the point, and yet bodies the invention a steel rod l of circular enter a chamber in the shank of such moder- 95 45 cross-section formed to approximately thediate size that it will not materially weaken ameter and length of the completed drill is the walls of the shank. boredto form passages 2. These passages may When a drill embodying this invention is be bored completel y through or only part way in use, as in a screw or other chucking maof the lengt-h of the rod and they may extend chine, a stream of lubricating-oil can be roc 5o parallel with each other and with the axis ot' forced by a small pump or otherwise from the rod or, as is most preferred, they mayinthe shank through the passages to the point,

so'as tO wash out the chips incident to the cutting b y the lips and conductaway the heat generated by rapid boring. The application Of a lubricant in this manner permits of a considerable increase in the rate of borin g over the Ordinary manner and prolongs the life of the drill beyond the limit of an ordinary drill. This drill is strong, for a web of good form may be left intact and the comparativelysmall chamber provided in the shank does not appreciably weaken the structure of the drill. y

It is durable, for the exterior surfaces of the lands are solid and stiff, and it is efficient, for the passages in the solid metal of the lands permit of the thorough lubrication of the cutting-lips of the drill Withoutnecessitating the removal of but a slight portion of the metal of the body of the drill. The drill is neat and attractive in appearance, for the passages are entirely concealed, except at the point, and the surfaces of the lands are not cut, marred, or filled with metal different from that Of which the drill is formed, and the drillis inexpensive,forthe operations performed in the process of its manufacture are not complicated or many.

I claim as my inventionl. A drill having spiral grooves and spiral lands with spiral passages surrounded by solid metal beneath the surfaces of the lands, substantially as specified.

2. A drill having point, shank, web, spiral grooves and spiral lands with spiral passages in the solid metal beneath the surfaces of the lands, said passages Opening through thc point and shank, substantially as specified.

A drill having point, shank, web, spiral grooves and spiral lands with spiral passages in the solid metal beneath the surfaces of the lands, said passages inclining to the axis of the drill and opening through the point and shank, substantially as specified.

4. A drill having point, shank, web, spiral grooves and spiral lands with spiral passages in the solid metal outside of the web of the drill but entirely beneath the surfaces of the lands, substantially as specified.

5. A drill having a point,chambered shank. web, spiral grooves and spiral lands with spiral passages in the solid metal beneath the surfaces of the lands, said passages opening through the point lat one. end and into the chambered shank at. the other end, substantially as specified.

G. The method of forminglubricating-drills which consists in boring a rod to form passages, scoring said rod outside of the passages. heating the scored rod and twisting it while hot until the passages assume the spiral of the lands to be formed, then milling the grooves and pointing and finishing the drill. substantially as described and for the purpose specified.

XV ALTER J. RICKEY.

\Vitnesses:

A. SHELTON DAVENPORT, JOHN R. BOOTH.

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