US407688A - Drill - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

A. RE'NBTZKY.

l DRILL. n

` No. 407,683. Patented July 2s, 1889.l

lv i| HIIIIIIIIII MIF i (Nq Model.) 2 Smets-Sheet 2.

A. RENE'TZKY.

DRILL No. 407,688. 8 Patented Jul-y 23, 1889.

UNITED STATES PATENT OFFICE.`

AUGUSTUS RENETZKY, OF LINCOLN, ILLINOIS.

DRILL.

SPECIFICATION forming part of Letters Patent No. 407,688, dated July 2.3, 1889. Application led March 14, 1889. Serial No. 303,222. (No model.) i

To @El whom. t may concern:

Be it known that I, AUGUSTUS RENETZKY, a citizen of the United States, residing at Lincoln, in the county of Logan and State of Illinois, have invented certain new and useful Improvements in Drills, of which thefollowing is a specification, reference being had therein to the accompanying drawings.

In the accompanying drawings, Figure l represents a front elevation of my improved drill 5 Fig. 2, a vertical longitudinal sectional view of the same, a small portion of the upper part of the sliding frame being broken away to show attachment of the vertical arms to the stationary frame; Fig. 8, a transverse sectional view on the line a2 of Fig. 1, looking upward; Fig. 4, a plan view of the divided boX attached to the upper ends of the vertical arms; Fig. 5, a longitudinal sectional view of the drill-holder; Fig. 6, a transverse sectional view on the line y y of Fig. 2, and Fig. 7 a detail view showing connection of advancing screw to ratchet-wheel shaft.

The invention has for its object to provide improved and simple means for automatically revolving the drill during its reciprocatory movement, and for automatically advancing the drill, as will more fully hereinafter appear. i

The invention also has other minor objects in view, which willfully appear in the course of this specification.

In the accompanying drawings, the letter A designates a suitable stationary frame provided with vertical ways a a and a lateral arm ZJ, by which latter the said frame may be secured to any suitable support. Attached to the upper end of the frame A are two vertical arms cc, slightly bent forward,'and connecting the upper ends of these arms is a cross-bar d; This bar d has secured to -or formed integral with it a pair of ears CZ d', between which is pivoted an other bar e, having a beveled or rounded end e. This pivoted bar e is adapted to fit close against the front side of ,the bar d and be clamped thereto y by a loop f, pivoted upon the said bar d, this loop being adapted to be slipped over the rounded end of the pivoted` bar and press against the same. The adjacent faces of the bars CZ and e are provided with internally-screw-threaded sei'nicircular grooves, which together form a vertical screwthreaded passage for the vertical screw B, attached to the sliding frame C. When it is desired to remove this screw B from between the bars, it is simplynecessary to throw back the pivoted loop f, when the bar e will be fre-e to swing out, as shown in dotted lines in Fig. 4. l p

The sliding frame C is provided with vertical iianges a o/ Qwhich iit and slide in the vertical ways a in the stationary frame. Journaled in bearings g g, secured to the face of the sliding frame, is the transverse drive-shaft D, which is provided with a suitable spur-wheel h and operating-crank 7L. I-Iaving its lower end stepped in one of the bearings g and its -upper end in a supplemental bearing g is a vertical rock-shaft E, which is provided at or near its upper end with a horizontal forwardlyprojecting arm t. Pivoted in the bifurcated end of this arm i is a springactuated pawl fi', which is held constantlyV in engagement with a ratchet-wheel j, secured to the lower end of a short vertical shaft j', which latter is journaled in a divided box or bearing k upon the upper end of the sliding frame.

The shaft E is periodically operated by means of an eccentric l on the main-shaft I), this'cam impinging against the face offa iinger Z', carried by the said ioclcsliat't.

The pawl t" is held constantly in engagement with the ratchet-wheel and the finger l kept pressed against the eccentric Z by means of a wire spring m coiled around the rockshaft, one end of this spring resting against the sliding frame and the other end attached to the pawl, as shown in Fig.

By reference to Fig. 2 it will be observed that the lower end of the screw B is rounded and inserted loosely in a socket j formed upon the upper end of theshort flanged shaft j and is pivot-ally secured therein by means of the horizontal pin k', the pin .passing through the socket and engaging a notch formed in the lower end of the screw. The object in thus pivotally attaching the vertical screw to the shaft is to permit the screw to be swung out from engagement with the box upon the ends of the vertical arms c, as shown in dotted lines in Fig. 2. V

Itwill beobserved thatby means of the eccen- IOO tric, rock-shaft, pawl, and ratchet-wheel wh en the main shaft is rotated the vertical screw B Will also be rotated. This rotation of the screw causes the sliding frame to be slowly advanced, as is evident. When the frame has advanced the required distance, the opnected to the drill-holder G by means of a pitman I-I and a short rod H', this rod being pivotally connected to the lower end of the pitman.

The drill-holder consists, essentially, of a cylindrical rod or bar having removably secured in a socket in its lower end a suitable drill or chisel. This cylindrical bar is guided in its reciprocatory movements by means of suitable divided bearings n n, bolted to the sliding frame. The short connecting-rod II is connected to the drill-holder by having formed on its end a head or enlargement p, the headed end of this rod being inserted in a cylindrical recess in the upper end of the drill-holder and held therein by means of a bushing s, tapped in the said cylindrical recess in the drill-holder, the lower end of the bushing bearing against the head on the end of the rod H', as shown in Fig. 5.

To cushion the jar of the drill, I interpose between the lower end of the rod H and the bot-tom of the recess an elastic block t. I may, if found desirable, insert between the end of the rod and the cushion a metallic disk or washer t', the disk being provided with a central pin which fits within a central passage in the cushion, shown.

By connecting the pitman to the drillholder in the above manner the latter is permitted to rotate freely in its bearings while it is being reciprocated. The drill-holder is rotated automatically by the followin means: Secured to or formed integral with the holder, at a suitable point between its bearings, is a ratchet-wheel u, and alongside of this ra tchetwheel is an annular groove, in which is loosely secured a divided collar w. The lateral projections w of ythis divided collar rest and travel upon oppositely-inclined ways .fr upon the sides of the sliding frame, one way being' placed upon either side of the drill-holder. Iivoted to an ear formed upon the divided collar is a spring-actuated pawl y, held in constant engagement with the adjacent ratchetwheel. It will thus be perceived that as the collar is partially rotated by the inclined ways the pawl will engage one of the teeth of the ratchet-wheel and carry the drill-holder around with it, and as the collar is rotated in the reverse direction by the reverse movement of the holder the pawl will automatically ride or slip back to the next tooth of the wheel, ready for another operation, and so on, the drill-holder being kept constantly rotating in the same direction so long as the drilling operation is continued.

Having thus fully described my invention, what I desire to secure by Letters Patent isl. The combination of stationary and sliding frames, a divided box upon the former, a short shaft journaled in the sliding frame and provided with a ratchet-wheel, a screw pivotally attached tothe said short shaft and clamped between the said divided box, and a rock-shaft and pawl for operating the said ratchet-wheel, as described.

2. The combination of the drill-holder G, recessed at its upper end, a headed connecting-rod II', inserted in the said recess, a bushing s, tapped into the said recess, acushion interposed between the headed end of the rod II and the bottom of the said recess, and a metallic washer inserted between the cushion and headed end of rod II', as and for the purpose set forth.

3. The combination of a cylindrical drillholder and mechanism for reciprocating it, a

ratchet-wheel secured to the said holder, a

divided collar upon the said holder, a springactuated pawl engaging the said ratchetwheel, and reversely-inclined ways for rotating the said collar, substantially as described. In testimony whereof I affix my signature in presence of two witnesses.

AUGUSTUS RENETZKY. lVitnesses:

ADAM DENGER, W. H. RIeDoN.

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