US245134A - Upright drill - Google Patents

Description

2 sheets-sheet 1'.

G. M. COBURN.

(Model.)

UPRIGHT DRILL.

245,134.- Patented Aug. 2,1881. y

GEORGE M. ooBUEN, or' WALTHAM, MASSACHUSETTS.

UPRIGHzT-DRILL.

sPEcIrxcA'rroM. forming part of Lettersglsatent No. 245,134, dated August 2, 1881.: y nppncauon'nied oqftobrn, 1ero. (Model.)

Iolall 'ui/wm it may concern: Be it known that I, GEORGE M. CoBUaN, a?

resident of Waltham, in the county of Middle-f*l sex and State of Massachusetts, have invented certain new and useful 'Improvements in Up-if` right Drills; and 1 do hereby decisi-echar the; following is a full, clear, and exact description thereof, reference being had to the' accompanyy cation.

ing drawings, andto the letters of reference) marked thereon, making a part of this specifi-i This invention relates to hand-drilling inachines adapted to' produce automatically a fast,y or slowlmotion of the drill at the'pleasure of; the operator. g

It has for its object an improvement in the;` means, first, for producing a slow automatic feed of the drill and for its adjustment; sec. ond, for throwing the ldrill out of gear auto-5y matically,.and for producing its quick returm` when it has completed its downward movel.-

ment; third, for changing the Speed and power? ofthe drill; fourth, for' lifting the drill-table out of way of the foot-piece by 'a hin-ged joint 5:

and, fifth, for adjusting the foot-piece and ta- .a top view of .the apparatus.V

frontelevation, showing the drill-table thrown? up'lupon its hinge; Fig. 2, a cent-ra ransverse] -section taken laterally through the d ill in line` .r w, Fig. 4; Fig. 3, a 'sideelevatiom with the@ side gearing removed'to illustrate t e. parts otherwise hidden thereby,- and Sho )ing the; drill-table in Working position 5 and Fig. 4 is A, Figs. 3 andl 4, represents .the mainup-li right frame of the machine; B, the spindle of thedrill, supportedv bythe frame in verticall .bearings a a A', Figs. 1 and 2, a horizontallz 40- side frame projecting from and connected with? the main VframaA and supporting the bear- 4ings'for'thehorizontal shafts C EF. The

driving-shaft C is geared by means ofthe intermediate bevel-Wheels directly to the spindle B, and maybe driven directly from the actu` ating-crank D of the machine, or indirectly and with a-higher speed by` means of a secondaryy set of gear-wheels and an auxiliary speed-shaft,

TE. A ily-Wheel shaft, F, is geared to the shaft; 1F', and also to crank-headDQso as tofhave 'constant..motionlA The crank D is secured to ,shaft of the iiy-wheel F.v to increase the speed of the main shaft G the ,crank-head D is loosened, so as'to turn freely with its gear-wheel l upon theend of the shaft. 3 i 'The movement of thecrank is then communi- Ycated by mea-ns'of the gear-wheel l to the second shaft,'Eand from it, by means of the gear- -Wheel2, to the pinion 3 upon the shaft C, the

difference in diameters'of the gear-wheels servahead or sleeve, D', carrying upon its inner end a gear-wheel, 1. v This head or sleeve is left free to revolve loosely upon the vend of the driving-shaft C, but may be rigidly fixed to it byfmeans of a set-screw, e. (See Figs. 2 and 4.) The gear-wheel maintains the same position upon the crank-head Dt Whether thelatter is `fixed or loose, and it meshes with a smaller pinion upon the end 0f the second horizontal shaft, E. (See`Fig.4.) Alarger'gear-WheeLZ, y.

is'secured by a feather on Vthis shaft E, so as .to revolvewith it and yet be free to move Alongitudinally in and outfot' gear with a smaller gear-wheel, 3, upon the front shaft, C, (See Figs. 11 and 2,) and it meshes also constantly .with a small extended pinion, 4, (see Fig. 4,) upon the When it is desired ing to multiply greatly the speed. Where a slow speed is requiredthecrank-head D is "rmly secured-to the shaft C by means'of the 'set-screw e, and the pinion 2 upon the speedshaft E is thrown out of gear withY the pinionA 3, so thatthe movement of the crank ,is imparted directly to the main shaft G. Ineither 'case the movement of the'crank through the intervention of .the gear-Wheelsfl, 2,)l and 4 is i constantly communicated tothe ily-wheel shaft .F without change, so that thel ily-wheel will always revolve in 'the same direct-ion and with uniform speed, whether the speed-shaft E be fin or out of gear with the Shaft C, and-conse- 'que'ntly revolving with slow or vwith rapid motion.4 The revolution of the shaft C produces, by means of beveled gears G G', Figs. 1 and 2, aconstantrevolution of the drill-spindle B.

.` Upon the upper end ofthe spindle is placed a horizontal ratchet-wheel, H, (see Fig.'4,) which turns loosely upon the spindle.

Upon a frame or plate, K, supported over the wheel H by means ot' a curved bracket,L, Secured to the upper part ofthe frame A, are pivcted tivo levers, M M, whose outer arms'ex- IOO f tend: to "theouter edge of the ratchet-wheel and carry swinging pawls m m to engage the ratchet-teeth of the wheel, and whose inner arms are fitted with friction-rollers n a to bear against a cam, o, secured to the spindle B. The inner ends of the levers m m are thrown inward so as to bring the friction-rollers into constant bearing against the cam by means of suitable springs p 1J, Fig. 4. The levers are so adjusted with reference to the cam that the revolution of the spindle will alternately throw the inner ends of the ratchet-levers outward and their outei arms forward, and thereby produce, by means of the engagement of the pawls m m with the ratchet-wheel teeth, a corresponding movement of the ratchet-wheel. The forward movementof each lever under the iniiuence of the cam will compress the leverspring, which will then operate to throw back the lever when the pressure of the cam is removed. The alternate movement of the two levers will produce a nearly constant movement of the ratchet-wheel. The extent of the forward movement or throw of each lever, and consequently the degree of movement of the ratchet-wheel at each revolution of the drill spindle and cam, is regulated by means of the bar P pivotcd upon the spindle and supported upon a pillar, P', Fig. 3, projecting from the bracket L. The position of this bar P is adjusted by means of a set-screw, o, passing through a slot in the bar. A pin or stop, d, depends froln this bar in front of the outer end of each arm and serves to arrest the backward movement of the arm under the influence ot' its spring. By turning the bar P so as to bring lthe stops nearer to or farther from the levers and securing it when adjusted by means of the set-screw c the throw of each lever is controlled so as to produce a slower or more rapid movement of the ratchet-wheel.

.The spindle B is fitted below the feed-wheel H with an eXteriorly-threaded sleeve, J', which is so made to engage the spindle as to prevent any independent longitudinal movement of the sleeve and spindle, and yet allow the spindle to revolve freely within the sleeve. The feed of the spindle B is produced by means of this threaded sleeve J and an interiorly-threaded nut, J, (see Fig. 2,) fitted thereon. This feednut J is free to revolve inbearin gs in the frame A and carries at its upper end a loose clutch, R, Figs. 1 and 2, which when thrown up engages co-actin g projections on the under side of the horizontal ratchet-wheel H. When the clutch R is slipped up to engage the ratchet feed-wheel H the movement of theratchet-wheel is transmitted to the nut, and the latter byits rotation causes downward vertical movement inthe drill-spindle B. The feed-nutJ is coupled by bevel-gears 5 and 6 with the shaft of a handwheel, S, revolving horizontally in a bracket, S', extended for the purpose from the main frame A. A cog-wheel, 7, formed upon a collar sliding longitudinally upon thespindleB above the lower drive bevel-wheel G, and made to rotate with the spindle by means of a spline between the two, engages the bevel-wheel 6 when properly carried upagainst it. (See Fig. 2.)

The lower end of the collar of the wheel 7 is provided with a clutch, to en gage the face of the lower drive-wheel, G ,when dropped against it. A forked clutch-bar, lt, Figs. 1 and 2, engages the collar of the wheel 7, and is connected with the upper clutch-bar, R', by a coupling-bar, T, sliding in suitable ways, or upon pins projecting from the fixed bearings a a of the spindle, so that when the upper clutch, R, engages the ratchet-wheel H the lower clutch shall be disengaged from the lower drive-wheel, G, and vice versa. A pin mounted upon the threaded sleeve J projects through a longitudinal slot in said reversing slide-bar T, and an adjustable stop is iitted in the slot, against which the pin is brought to bear in the upward movement of the drillspindle B when it has nearly reached its highest desired elevation, so that spindle B will carry up with it the reversing-bar T. This movement of the bar will operate to engage the upper and disen gage the lower clutch, and thus reverse the feed of the spindle. In its downward movement the pin from the sleeve J will bear against a lower stop in the slot of the bar T, so that when the drill has nearly reached its lowest point the reversing bar T will be forced down, the upper clutch disengaged, and the lower clutch made to engage the bevel drive-wheel G, so as to reverse the feed automatically and produce afast upward movement of the drill.

When the drill is being fed by the ratchetwheel H it may be fed independently as fast as desired by means of the hand-wheel S. The feed of the drill may be placed wholly under control of the hand-wheel S by throwing up the pawls m from the ratchet-wheel and sliding up the reversing slide-bar T to disen-l gage the lower clutch from the drive-wheel. When this clutch is not released from its connection with the driving-wheel the feed will be automatically reversed, producing alternately, with a constant movement of the crank and rotation of the drill in one direction, a slow downward and a rapid upward feed ot' the drill-spindle.

The foot-piece U of the drill is fitted to a vertical post, W, of the main frame by means of a collar encircling said post. A series of circumferential grooves, t t, are cut upon the post at regular intervals, and a catch, Fig. 3, upon the under side of the foot-piece is arranged to engage said grooves, and thus support the foot-piece at the height of either of said grooves, and yet permit it to turn upon the post without slipping.

A suitable table, Y, is hinged to a collar, Z, fitted upon the post above the foot-piece so as to be supported by said foot-piece. The table may be turned up upon its hinge against the post out of the way of the foot-piece, so that the latter may be used alone, or the table may be let down upon the foot-piece, in which case it receives lateral support therefrom by means IOO IOS

spindle, byvthrowing the speed-shaft in or out of gear with the main shaft. A change of speedin the drill-spindle B, without changing the speed of the driving-crank, is readily effected by loosening or tightening the attachment of the hub D of the crank to the main drivingshaft C, and throwing the auxiliary speedshaft E in or out of gear with said main shaft G.

The feed of the drill may be produced with a uniform gradual movement by sliding up the reversing-bar T so as to leave the gear-wheel 7 disengaged from the drive-wheel Gr, and thus cause v"the feed-nut J to be operated by the ratchet-wheel H, actuated by the cam and levers on the upper end of the spindle B, this Aratchet-feed being rendered slow or fast by changing the position of the bar P, which controls the throwv of the levers. A rapid return of the drill-spindle B will be produced automatically by the movement of the reversingbar T, through its connection with the threaded sleeve J on the drill-spindle, which will operate so soon as the drill-spindle has reached its 'lowest point to disconnect the feed-nut J from the ratchet-wheel H and connect it by means of thegearingf, 6, and 7 with the main shaft, so as to produce a rapid reverse movement of the feed-nut J This reverse movement will, in turn, be'automatically checked by the automatic movement of the reversing-slide T, actuatedby the upward movement of the threaded sleeve J', which will operate to disconnect the gear 7 from the driving-wheel Gr, and to connect nut J again with the feed-wheel E.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination, with the driving-shaft G, of the drill and with an auxiliary shaft, E,

provided with a sliding pinion, by means of 5o which it may be thrown in and out of gear with said driving-shaft C, of a crank-hub, D',

and attached pinion 1, fitted to turn loosely upon thenend of the driving-shaft C, and to gear with a pinion upon the auxiliary shaft E, and be secured at will to said drivin g-shaft G by means of-a set-screw, substantially in the manner and for the purpose herein set forth.

2. The combination of the crank-hub D and pinion 1, the auxiliary shaft E, and ily-wheel shaft F, geared to move together, with the driving-shaft C arranged to be connected to and driven by either the crank-hub D or Jthe auxiliary shaft E, as may be desired, substantially in the manner and for the purpose hereinset forth.

3. The combination of the upper clutch, R',

the feed-nut J, the ratchet-wheel H, sliding bar T, threaded sleeve J', reversing-pin, and lower clutch, B, substantially as and for the purpose herein set forth.

4. The combination of the bevel-gearing 5, 6, and 7, the feed-nut J, the driving-shaft G, and bevel-gear G G', substantially as and for the purpose herein set forth. p

5. The combination, with the main post W of an upright drilling-machine, and with a collar, Z, traversing and rotating upon said post, of a plate or table, Y, hinged to said collar to admit of being thrown up vertically against the post, substantially as and for the purpose herein set forth;

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEO. M. COBURN.

Witnesses:

M. J. LARKIN, C. F. STONE.

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