US371800A - John c - Google Patents

Description

(No Model.)

J. O. STEVENS.

BOOK DRILLING MACHINE.

No. 371,800. Patented Oct. 18, 1887.

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JOHN G. STEVENS, OF PORT CHESTER, NEW YORK, ASSIGNOR TO NATHAN O. POND, MARSHALL 0. WEST, AND ERNEST SIMONS, ALL OF SAME PLAOE.

ROCK- -DRILLING MACHINE,

SPECIFICATION forming part of Letters Patent No. 371,800, dated October 18, 1887.

Application filed January 25, 1887. Serial No. 225,435. (No model.)

To all whom, it may concern.-

Be it known that I, JOHN G. STEVENS, a citizen of the United States, residing at Port Chester, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Rock-Drilling Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates, in general, to that class of rock-drilling machinesin which a drillcarrying shaft is caused to reciprocate longitudinally to drive the drill by successive thrusts into the rock, and it particularly relates to improvements in the Ingersoll rockdrill, patented July 5, 1856, and numbered 344,906.

The object of the invention is to produce a simpler machine with fewer working parts and with parts not so liable to be broken.

To this end the invention consists in mech anism for raising the drill against the resistance ofa spring, in means for defending the machine from injury by wild blows, and in means whereby the amount of the said, raising may be graduated proportionally to the blow or thrust required in dilTerent kinds of work to be done by the machine, as hereinafter described and claimed, reference being had to the accompanying drawings, in which-- Figure 1 is a section, part in side elevation, of a rock-drilling machine showing myinvention; and Fig. 2 is a rear or under side view of the cam-wheel and beveled gears and a portion of the frame and carriage.

4 represents the frame of the machine, mounted, as usual, upon a tripod of adjustable legs, 5.

6 is the drill, carried by a drill-shaft, 7,which' isjournaled to rotate and to reciprocate longitudinally in a carriage, 8, which is fitted-to slide on the frame 4: when fed along by hand or automatically by a screw, as usual.

9 is a spring which thrusts the drill-shaft forward or downward in the act of drilling.

10 is a cam-wheel provided with bevel gearteeth and journaled upon a stud, 11, which is fixed in the carriage 8, and the arms 12 of this Cane engage a roller, 13, mounted on a stud, 19, which projects from the cross-head 20, that is fixed to the drill-shaft 7, the stud 19 being parallel with the stud 11. The cams act to ter of the cam-wheel, whereby each revolution of the cam-wheel raises the drill as many times as there are arms 12, the spring 9 throwing down the drill as soon as the roller 13 leaves the inner end of each arm.

14 14 represent beveled gear-wheels journaled on independent studs fired in the carriage 8, to engage the oppositeedges of the cam-wheel 10, and provided with cranks 15, whereby the operator is enabled to operate the machine while standing at either side thereof, or he may stand either to the. front or rear thereof and turn both cranks 15 at once in opposite directions to operate the machine. The cranks may be set to both hang down at once, in which case the operator may exert his strength without moving the machine bodily either way and without being forced off from his base, because he pushes with one hand and pulls with the other; but if the object be to maintain the machine as rigidly as possible in its position against-a twisting strain, then the cranks should be set opposite each other, one up while the other is down, so that both must be pulled upon or both be pushed upon at the same time.

To adapt this machine to strike blows of Varying degrees of force, I make the arms 12 adjustable as follows: 16 is a pivot-bolt by which the outer end of the arm 12 is secured to the cam-wheel, and each arm is provided with one or more slotted segmental ears, 17, concentric with the pivot 16, and screw-bolts 18 pass through these slotted segments and into the cam-wheel, whereby the cams may be swung into different positions, as shown in dotted lines, and then be rigidly secured to the cam-wheel in any such position. The nearer the inner end of an arm is set to the center of the cam-wheel the higher the drillwill be lifted thereby, and, the spring being more com pressed, the more forcible will be the blow,

and vice versa,

draw the drill-shaft up axially toward the cen- 55 To prevent jar and damage to the machine in case it is operated when there is nothing to receive the force of the blow-such blows when made being termed wild blowsI hax e provided buffers or cushions 20, fixed on some stationary portion of the carriage 8-such as the lower cross-bar thereof-to receive the cross-head 21 when the spring throws it a little beyond its normal path. There may be one or more such cushions, and I prefer soft rubber as the material therefor.

The drill-shaft 7 maybe intermittently rotated to give the bit or drill a new cut at each stroke by any usual means-such as a spiral slot in the drill-shaft engaged by a feather fixed in a ratchet-wheel, 23, which is kept from revolving in one direction by the usual spring-paw], but is caused to revolve in the other direction a part-of a circle at a time by the vertical motion of the shaft. By this means the vertical motion of the shaft in one direction rotates the ratchet, and the vertical motion thereof in the opposite direction rotates the drillshaft, because the ratchet is held still at its last stopping-place.

I do not suppose or claim this device to be a new mechanical movement for converting continuous rotary motion into reciprocating rectilinear motion. The cranks, the bevelgears, the cams, the reciprocating shaft, and

the cushions or buffers are common devices when used singly for similar purposes.

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

1. The combination, in a roclcdrilling machine, of a drill-carriage, a drill-shaft journaled to reciprocate therein and provided with astud and a roller on it projecting from its side, a cam-wheel journaled on a stud. fixed in the drill-carriage parallel with the said rollerstud, and one or more cam-shaped arms pivoted at one end of each to the cam-wheel near its edge and adj ustably secured at the other end to the cam-wheel, substantiall y as shown and described.

2. The combination, in a rock-drilling machine, of the cam-wheel 10, the cam-shaped arms 12, provided with slotted segmental ears 1 17, the pivot-bolts 11 and 18, securing the cam-arms 12 to the cam-wheel, and the drillshaft 7, provided with a stud and roller, 13, adapted tobe engaged by the said cam-arms, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN G. STEVENS.

\Vitnesses:

STEPHEN A. MARSHALL, JOHN E. MARSHALL.

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