US802060A - Drill. - Google Patents

Description

PATENTED 00T. 17,1905.

G. E. STONE.

DRILL.

APPLICATION FILED MAR. e. 1905.

idrill.

UNITED STATES PATENT oEEroE. t

CHARLES E. STONE. OF BUFFALO, NEW YORK, ASSIGNOR TO BUFFALO FORGE COMPANY, OF BUFFALO, NEW YORK.

DRILL.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed March 6, 1905. Serial No. 248,690.

To al when?, it may concern:

Be it known that l, CHARLES E. STONE, a citizen of the United States, residing at Bu tfalo,`

or moved longitudinally by an automatic or` hand-operated feed-screw arranged in line with and connected to the drill-spindle.

The objects of the invention are to provide a desirable detachable coupling for the drillspindle and feed-screw of this type of drills whereby the spindle can be readily discon-4 nected from the feed-screw and advanced and retracted by hand to enable rapid operation upon light work and to construct said detachable coupling with an antifriction bearing,

which receives the end thrust of the drill-` spindle both when the latter is operated by the feed-screw and by hand.

In the accompanying drawings, Figure l is.

aside elevation of a drill provided with a coupling and bearing embodying the invention. Fig. 2 is a fragmentary front elevation of the Fig. 3 is a sectional elevation, on an enlarged scale, of the coupling' and bearing.

Fig. 4 is a fragmentary sectional elevation ofy the drill, on an enlarged scale, showing' the drill Spindle and feed screw disconnected. Fig. 5 is a fragmentary horizontal sectional plan, on an enlarged scale, in line 5 5, Fig. l.

Like letters of reference refer to like parts in the several figures.

The invention is illustrated as applied to a well-known type of upright power-drill, in which the drill-spindle is arranged vertically and power-driven and is advanced to the work by a combined automatic and hand-operated screw-feed mechanism; but the improvements are equally applicable to other types of drills.

The known features of the drill shown in the drawings may be brieiiy described as follows: A represents the upright stationary frame; B, the vertically-adjustable work support or table; C, the vertical drill-spindle, which is journaled to rotate and move longitudinally in bearings in the frame above the work-support; D, a horizontal drive-shaft, which may be either hand or power operated and rotates the spindle through bevel-gears d and change-speed gears 62'; E, the non-rotary feed-screw, which is connected to the spindle and extends up through a guide-bearing c on the frame and works in the screw-threaded hole of a rotary gear-wheel c', and F a'feedscrew-operating wheel, which is secured to a horizontal shaft provided with a gear-wheel f, meshing with the screw-threaded gearwheel c. By rotating the wheel F the screwthreaded wheel c is rotated and the feedscrew E moved longitudinally to advance or retract the spindle, according to the direction of rotation of the screw-operating wheel F. The latter can be operated by hand and also automatically by a pawl g, engaging ratchetteeth on the wheel F and operated from the drive-shaft D by a pitman g and pawl-lever g2. The machine as thus far described is of well-known construction and operation.

The drill-spindle C is detachably connected to the feed screw ordevice-E by the combined coupling and thrust-bearing now to be described, whereby the spindle can be quickly and with little trouble disconnected from and operated independently of the feed screw or device.

H represents a hollow Shell or boX, which is loosely connected to the upper end of the drill-spindle in such manner that the spindle can turn in the shell, which is held from rotation. As shown in the drawings, (see Fig. 3,) the reduced upper end /L of the spindle extends into the shell througha hole in its lower end and has fixed on its end in the shell a bearing member or disk I, between which and a bearing-disk l/, fixed in the shell H, are rolling bearing balls or devices if. The rotary bearing-disk I is preferably 'secured on the spindle by a left-hand screw-thread or a thread so directed as to cause the bearing-disk to tighten thereon in the rotation of the spindle, and the other or stationary bearing-disk is preferably threaded and screwed into an internal thread in the shell and is fixed against rotation by a set-screw t". The stationary bearing-disk is provided with holes 2, adapted to receive a tool for inserting and removing the disk and which also serve as oil-holes to enable the lubrication of the bearing. An

antifriction-washer 3 of iiber or other suitkey 7n, of any desired form, capable of ready removal. A U-shaped key is shown, which enters pairs of registering holes in the head K and shell H. When the key is inserted, as shown in Figs. 3 and 5, the spindle is coupled to the feed-screw and moved longitudinally therewith, and when the key is removed, as shown in Fig. 4, the spindle is disconnected from the feed-screw and can be advanced and retracted independently of the screw.

In the machine illustrated the couplingshell H and the feed-screw to which it is secured are held from rotation by a finger Z, projecting from the shell and slidably engaging in an upright slot Z, Fig. 4, in the frame. Any other means for holding the screw and shell from rotation could be employed.

M represents ahand-lever fulcrumed on the frame and connected to the coupling-shell for advancing and retracting the spindle by hand. The rear end of the lever is preferably forked and straddles the coupling-shell lH' and frame A, to which it is pivoted by bolts or pins m. One fork-arm is extended rearwardly beyond its pivot and provided with a counterbalancing-weightm. The coupling-shell has lateral projections or pins m2 working in slots m3 in the fork-arms of the lever.

When the drill-spindle is coupled tothe feed-screw,'as shown in Figs. 1 and 2, it is fed to the work automatically by the ratchetand-pawl mechanism F g, or it can be fed slowly by hand by throwing the pawl gout of engagement with the ratchet-wheel F and turning the latter manually in the usual manner. When the character of the workis such as to permit feeding of the drill by handpressure, or when anumber of holes are to be drilled in light or thin stock, making rapid operation ofthe drill possible and desirable, the coupling-key is removed to free the drill-spindle from the feed-screw, when the spindle can be advanced and retracted'rapidly by the hand-lever. The coupling and uncoupling of the drill-spindle and feed-'screw can be effected very rapidly and with little trouble or exertion by the coupling device described.

Y The ball thrust-bearing is also'moreeficiently located in the construction described than in the rmore common arrangement, where the ball-bearing is located between the threaded operating-wheel e for the feed-screw'and the frame, because there is much greater wear in the coupling between the rapidly-rotating spindle and the stationary feed-screw than there is between the more slowly-rotating weel e and its bearing. The combined coupling and bearing is exceedingly simple and inexpensive in construction. The ball thrustbearing receives the thrust ofthe spindle both when the latter is coupled to the feed-screw and when disconnected therefrom and operated by the lever.

feed device when the spindle is disconnected from the feed device, substantially as set forth.

Q. The combination of a longitudinally-movable rotatable drill-spindle, means for rotating the same, a feed-screw and operating means for advancing the spindle, a coupling detachably connecting the spindle and feed-screw and comprising parts carried by the spindle and feed-screw, respectively, and a lever connected to that part of the coupling carried by the spindle for moving the latter longitudinally independently of the feed-screw when the spindle is disconnected from the feedscrew, substantially as set forth.

Thecombination ofalongitudinally-movable rotatabledrill-spindle, means for rotating the same, a feed-screw and operating means for advancing the spindle, a coupling device carried by the spindle and detachably connected to the feed-screw, an antifriction thrustbearing between the spindle and said coupling device` and means connected to said coupling device for moving the spindle longitudinally independently of the feed-screw when vspindle and feed-screw comprisinga shell,

cooperating bearing members carried by the spindle and said shell, and a movable device detachably connecting said shell to the feedscrew, substantially as set forth.

5. The combination of a longitudinally-movable rotatable drill-spindle` means for rotating the same, afeed-screw and operating means for advancing the spindle, and a combined coupling and thrust-bearing connecting the spindle and feed-screw, comprising a shell loosely connected to the spindle, cooperating bearing members fixed to the spindle and said shell, balls between said bearing members, a head fixed to the feed-screw and removably fitted in said shell, and a removable key connecting said shell to the feed-screw, substantially as set forth.

Witness my hand this 17 th day of February, 1905.

CHARLES E. STONE.

Witnesses:

WM. BRAEMER, WM. L. Fox.

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