US257532A - Drilling-machine - Google Patents

Description

UNITED STATES ZATENT amen.

GEORGE G. TAFT, OF WVORGESTER, MASSACHUSETTS.

DRILLING-MACl-HNE.

SPECIFICATION forming part of Letters Patent No. 257,532, dated May 9, 1882.

v Application'filed J anuary 27, 1882. (No model.) I

To all whom it may concern Be it known that I, GEORGE G. TAF r, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Drilling Machines, of which the following is a specification.

My invention relates to that class of drilling-machines known as self-feeding and the objects of my invention are, first, to operate the feeding mechanism directly from the revolving drill-spindle in a more compact and advantageous manner; and, secondly, to provide an arrangement of gearing to allow the speed of the drill-spindle to be varied as the exigencies of the work may require.

The accompanying drawings represent a drilling-machine embodying my invention, in which- Fi'gure 1 shows a front elevation; Fig. 2, a side elevation; Fig. 3, a detached view of the driving-gear, and Fig. 4 a view of the bentvibrating lever.

Similar letters refer to similar parts in the several views.

Properly journaled in the frame-work A A is the drill-spindle B,with the attached bevelgear B, which receives a rotary motion from the beveled gear B, attached to the sleeve 0, in whose mortised end is placed the crank D.

Turning upon the sleeve 0 is the pinion 0, having a mortised projection, E, upon its hub to receive the end at of the crank-bar.

Upon a stud attached to the side of the frame are the intermediate gears, F and F, transferring the motion of the pinion O to the gear F, attached to the beveled gear B, the intermediate gears, F and F, being so arranged as to reduce the speed of the beveled gear B.

The crank is interchangeable, and may be fastened in either of the mortises by the setscrews ea. Forordinary work I use the crank in the position shown in Fig. 1; but by transferring the crank to the projection E am enabled to greatly reduce the speed of the drill-spindle B, thereby increasing its power.

The drill-spindle B carries at its upper end the screw G, which, actuated by the nut G, imparts a vertical motion to the drill-spindle B, the gear B being so attached by a spline as to permit a sliding motion of the drill-spindle,ali being an ordinaryandwell-known form of construction. An intermittent rotary motion is given to the nut G by the gears H H and ratchet-wheel H, which is operated by the vibrating lever I and pawl I, the lever I turning upon the stud J, attached to the frame of the machine.

The hub K of the bevel-gear B is made eccentric or of proper cam form, and as the lever I is supported by-the stud J, parallel to the drill-spindle B, I bend the lower end of the lever, as at L, Fig. 2, and again at right angles to the plane of its vibration, as at L, extending it past the center of the spindle B, in order to receive the action of the eccentric K, against which it is pressed by the spring 0, acting against the lug 0, attached to the frame. The motion of the eccentric K, acting upon the bent end of the lever I, will give a forward motion to the pawl I and impart a rotary motion to the ratchet-wheel H, actuating the nut G and screw G, as shown. The spring gives the reverse motion to the lever I and pawl I.

Opposite the lug c, I place the lug c, attached to the frame and holding the adjusting-screw c, which may be advanced against the lever I, checking its reverse motion, and thus permitting the pawl I to pass over one or more teeth of the ratchet-Wheel H, as may be desired. I

I do not claim the use of an intermediate gear or gears for the purpose of varying the speed of the drill-shaft; nor do I claim the use of a gear or pinion running loose upon the driving-shaft for the same purpose.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with the drill-shaft B, bevel-gears B and B,sleeve O, and its attached crank-hub, of the loose pinion O, with its mortised projection E upon the side of its hub, the fixed intermediate gears, F F, gear F, and interchangeable crank-bar d, all arranged and constructed as described, and for the purposes set forth.

2. The combination of the spring 0, lug c,

yibrating bent lever I, pawl l, ratchet-wheel screw G, in combination with the ratchet H, and eccentric K on the drill-spindle, as wheel H vibrating lever I, pawll,a11d 00- 10 described, and for the purposes set forth. centric Is on the drill-spindle, asshown, and

3. The combination of the Vibrating bent ]efor the purposes set forth.

ver I, pawl I, ratchet-wheel H, eccentric K GEO. O. TAFT.

on the (trill-spindle adjusting-screw 0, and lug Witnesses:

o", as shown, and for the purposes specified. R. B. FOWLER,

4. The drill-shaft B and the connected feeil- II. M. FOWLER.

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