US316107A - barlow - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

0. 0. BARLOW.

Y MACHINE ROCK DRILL.

No. 3}6,10'7. Patented Apr. 21,Y 1885.

(No Model.)

2 Sheets-Sheet 2.

e. o. 13A-BLOW.

MACHINE ROCK DRILL.

No.` 316,107. Patented Apr. 21, 1885.

UNITED STATES "PATENT OFFICE.

CHARLES O. BARLOW, OF NEVADA` CITY, CALIFORNIA, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF THREE-FOURTHS TO GEORGE T. EMERY AND JOSEPH W. SPRAGUE, OF SAME PLACE, AND RICHARD H.

LANE, or NEW YORK, N. Y..

MACHINE ROCK-DRILL.

SPECIFICATION forming part of Letters IPatent'. No. 316.107, dated Apri1 21, 1885.

' Annina/tion filed June i7,` 1884. (No model.) V

.To aZZ whom it may concern.:

Be it known that I, CHARLEs O. BARLow, of Nevada City, county of Nevada, and State of. California, have invented-an Improvement .rock again, mechanism for rotating it, and

mechanism for delivering the blow.

It consists, further, in the various devices, hereinafter explained, by which these results are effected, and also in a device by which the frame or bar carrying the drill and driving mechanism is detached from the feed-screw and adapted to be moved back rapidly.

The object of my invention will be made clear in the course ofthe following description.

, Referring to the accompanying drawings, Figure 1 is a perspective View of my drill. Fig. 2 is a-vertical longitudinal section of the drill-arbor and its parts, showing the drill-bit in elevation. Fig. 3 is a perspective view of the cross-bar, showing the addition, in some cases,of a second drill-arbor. Fig. etis a perspective view of the second arbor, its bearing or seat being open. Fig.-5 is a longitudinal section of same. Fig. 6 is a perspective view of the two-part chuck S. Fig. 7 is a longitudinal section of the detachable nut c on feed- 117,516, led January 14, 18S/Land therefore 45 in referring to the general construction of parts Ido not intendto do sowith that particularity which would be necessary if I herein for the first time claimed novelty forthem.

A is thesupporting-column. B is the crossbar secured `to said column bya boxing, a, whereby the cross-bar is adapted to be adj usted vertically and to any desired inclination.

D is the body-bar, provided with a cross-, head, d, by which it is suspended from and is adaptedto slide upon cross-bar B. VThis movement is accomplished by means of the feedscrew C, as I shall hereinafter explain.

'Mounted in the lower endlof the body-bar D is the driving-shaft H, to which power is to be applied in suitable manner, as by the pulley h. Upon this shaft is an eccentric or cam, G, which, through anintermediate cushion, y,

and bearing Y', is adapted 'to-force back the hammer-holder I, into which the handle' j of hammer J is inserted. f The holder is held to its action with the eccentric vby means of the arm Y, pivoted rod Z, and spring K. These devices result in the yibration of the hammer to cause it to deliver its blow.

My first and main improvement relates tor the manner in which the drill-bit is connected with the machine and receives the blow of the hammer.

An arbor is usually fitted into aseat in the machine, and the blow delivered mustbe communicated through it and the chuck to the drill-bit. The weight ofthe arbor and chuck is generally about four or ve times the weight of the drill-bit, and I have found that a large percentage of the power applied to themachine is lost, as a great portion of the force of the blow is expended in overcoming the inertia of the drill arbor and chuck.

The object of my first improvement is to do away with the arbor, steel pin, and chuck through which the blow is communicated,l and to strike directly on the end of the drill-bit, whereby a much lighter blow will perform the same actual work, and this, of course, means the exercise of less power in operating the machine. In accomplishing-this object, of striking directly upon the head of the drill-bit certain necessities ofthe case mustbeconsidered.- In the first place, means must be provided to hold the bit when in an inclined position, then the drill-bit, being light, will rebound considerably from the rock, and there-` fore I must provide some means for controlling its rebound and for returning and holding it against the bottom of the rock to receive the next blow, and these means must also be adapted to move on the bit in order that the latter may advance into the hole as it deepens and that the hammer'may be moved up to the drill-bit. In the next place, means must be provided for rotating lthe drill which will also permit its line motion. Accordingly Ihave the following mechanism:

In the cross-head d is loosely seated,in line with the hammer, a hollow arbor, M,which is adapted to revolve freely in its seat and to have a slight line movement, Fig. 2. The

. hollow center of the arbor is larger in diameter than the drill-bit N, which passes through it, in order to allow said bit to be drawn out when necessary, notwithstanding its possiblybattered head. The forward portion of the theA drill-bit.

hollow center of the arbor is turned out to an increased diameter, and in this portion is fitted an annular elastic clamp or cushion, O, preferably a piece of rubber hose embracing One en d of this cushion abuts against. the shoulder formed by the increased center, as described, while against its other end the end of an annular gland or nut, P,

bears. This gland is externally threaded, while the hole into which it fits is'internally threaded, so that said gland can readily be screwed in against the cushion to compress it andr tighten itv on the drill-bit. The outer surface of the forward end of the arbor is threaded to receive a ring, (Ow-between which and the forward end of the arbor-seat in the cross-head d is a spring, B, preferably an annular band of rubber. The rear end of the drill-bit, which is tempered to prevent its being battered, projects behind the arbor, and is adapted to receive the blows of the hammer J. The effect of the blow direct on the head of the drill-bit is to drive itforward in the arbor and in the clamping-cushion O. Its rebound is received and broken by said cushion.` By means of the gland l? the tension of the cushion on the drill-bit is so adj usted that the rebound of the drill-bit is communicated through said cushion to the whole arbor, which moves back slightly, the outer spring, R, yielding to it momentarily, and then forcing it forward again to throw the drill up against the bottom of the hole, ready to receive the next blow. The tension of the cushion O is, however, not great` enough to prevent the advance of the drill under the blows it receives, nor great enough, in fact, to make the friction of any importance at all, compared with the advantage of obviating the use of the ordinary reciprocating drill-spindle or arbor and chuck; and the whole machine may, by means of the screw C, be moved up on the drill-bit as the latter advances and without stopping its operation. The rear portion of the arbor M is cut out to form a rectangular inwardly-t-apering socket, in which socket.

the two-,part tapering chuck S fitsfFig. 2. This chuck consists vof two. equal plates, in which are made angular grooves conforming to the angular exterior of the drill-bit upon which the said plates fit, Fig. 6. The chuck at itsv inner end abuts against a Washer, s, preferably-an elastic one, in the base of the A perforated screw-cap, T, fits over the rear end of the arbor and presses up against and holds the chuck, Figs. 1, 2. The cap has preferably a thin elastic washer on its inner surface which tightens it to its place when screwed up. This cap adjusts the chuck with sufficient pressure on the drill-bit to cause the rotation of the latter with it, and yet permit its line movement. As the chuck becomes worn ythe washer s is thinned down and the chuckis pushed farther in, its tapering shape and seat causing it to adjust itself properly;'or by making the washer elastic it will yield to the adjustment ofthe chuck. By fitting in a rectangular seat the chuck is of course rotated by the arbor. This rotation of the arbor is effected by means of the endless chain U, passing over a chain-pulley, u, on the arbor. The chain below passes around a pulley, o, operated by a worm gear, W, meshing with a worm (not here shown) on the driving-shaft H.

In machineswhere the drill-bit is long, or where it is working in rock in which it has a tendency to run to one side by reason of the seams or hard or uneven spots in the rock, I find it necessary to duplicate a portion of the devices I have described for the forward portion of the drillbit. This I showin Figs. 3, 4:, 5. From the forward end of the cross-bar B extends an arm, X, having a semicircular groove in it. To the endof this arm is hinged a swinging cap, X", 'havingacorresponding groove in it, which with the other groove, forms the bearing or seat for the arbor M. The general construction of this arbor and its appendages are similar to those previously described, omitting, however, the chuck and rotating devices, and are designated by similar letters. By throwing back the cap X the arbor may readily belifted out. The feed-screw C passes through a nut, c, secured to the crosshead d of the body-bar D. Now, if this nut were permanently secured to the crosshead, the body-l bar could be moved back to withdraw the drill-bit from the hole only by the operation of the screw, which would be a slow and tedious process. To obviate this I provide for the ready disengagement of the nut, whereby the body-bar may be moved back rapidly on the cross-bar. This is done by means of an' arm, d, extending forwardly from the crosshead, passing through the body of the nut c, and slotted to receive a cross-pin,o, whereby it is held with the nut. By removing the pin the crosshead is freed from the nut and the whole body-bar may be moved back with ease.

Having thus describedl myvinvention, what I claim as new, and desire to secure by Letters- IIO 1. In a machine rock-drill in which the drillbit is driven by a blow delivered directly upon its head, a drill-containing arbor seated in the frame or body of the machine, and adapted to have a line movement therein, an elastic cushion or clamp within the arbor and embracing the drill-bit, a screw-gland for tightening the cushion on the drill-bit, and an elastic cushion or spring between the front of the arbor and the frame of the machine, substantially as herein described.

2. In a machine rock-drill in which the drillbit is driven by a blow delivered directly upon its head, a rotating hollow drill-containing arbor seated in the frame or body of the machine, and a two-part tapering chuck in the rear end of the arbor and embracing the rear of the drill-bit, substantially as decribed.

3. In a machine rock-drill having a mechanism for delivering a blow, the hollow arbor M, seated within the frame or body of the machine in line with the blow-delivering mechanism, and the drill-bit N, seated in said arbor and adapted to receive the blow directly upon its head, and a'cushion,O, and chuck S, located within the arbor at opposite ends, substantially as herein described.

4. In a machine rock-drill in which the drill-bit is driven by a blow delivered directly or elastic cushion or clamp O, seated in its forward end and embracing the drill, and the screwgland P, by which it is compressed upon the drill-bit, substantially as herein described.

5. In a machine rock-drill having a mechanism for delivering ablow, the hollow arbor M, through which the drill-bit passes, having a rectangular tapering socket in its rear end, the two part tapering chuck S, fitting in said socket and embracing land engaging the drillbit to effect its rotation, the perforated screwcap T, and means for rotating said arbor, in cambination with the drill-bit N, adapted to receive the blow directly upon its rear end, substantially as herein described.

6. In a machine rock-drill having a mechanism for delivering a blow, the hollow arbor M, through which the drill-bit passes, having a rectangular tapering socket in its rear end,

with an elastic washer, s, at its base, the twopart tapering chuck S, fitting in said socket and embracing and engaging the drill-bit, the perforated screw-cap T, and means for rotating the arbor, consisting of the chain-pulley u, endless chain U, and means for driving it, substantially as described, in combination with the drill-bit N, adapted to receive the blow directly upon its rear end, substantially as herein described. l

7. In a machine rock-drill having a mechanism for delivering a blow, the hollow arbor M, seated in the frame or body of the machine and adapted to have a line and arotary movement therein, the screw-band Qon its forward end, and the spring or elastic band or packing R,wherebythelinemovement is controlled,

the annular elastic clamp or band O, seatedin the forward end of the arbor, and the screwgland P, by which it is compressed upon the drill-bit, the chuck S, seated in the rear of the arbor and engaging the drill-bit, theperforated screw-cap T, and means for rotating the arbor, all arranged as herein described, in combination with the drill-bit N, adapted to receive the blow directly upon its head, substantially as herein described.

8. In a machine rock-drill having a mechanism for delivering a blow, the cross-bar B and sliding body-bar D, and the arbors M, seated in suitable bearings, one on said cross-'bar at `its forward end and the other on the bodybar, said arbors having the clamping-cushions O and the spring-cushions R', substantially -as herein described, in combination with the drillbit N, passing through said arbors and adapted to receive the blow directly upon its head, substantially as herein described.

9. In a machine rock-drill, the cross-bar B,

feed-screw C, and nutc on said screw, in combination with the body-bar D, carrying the drill-bit and driving mechanism, said bar having a slotted arm, d, passing through the nut and confined by a removable pin, c', substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

CHARLES O. BARLOW.

roo

Images