US110280A - Improvement in rock-drills - Google Patents

Description

@M @VM WWW/JWM PATENTED DEC 20 1870.

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,mi @titte CHARLES PECK, CE NEW HAVEN, CONNECTICUT, AssieNoa To HntsELr AND MILO PEOK,

or SAME PLACE.

Letters Patent No. 110,280, dated December 20, 1870.

IMPROVEMENT IN RQCK-DRILLS.

The Schedine referred to in these Letters Patent and making part orme same.

known as rock-drills, and consists in certain novel ar rangements and combinations ot' parts, the purposes of which will be fully set forth and A described hereafter.

Description of the Drawing.

Figure 1 is a frontA elevation of my machine. Figures 2 3, and 4 are parts in detail.

General Description.

The frame proper consistsl of the upright A and bracket D, secured to the bed-plate R, and provided with guides c a, in which the sides B Bof the drillframe slide The horizontal bars G0 of the drill-frame support and furnish bearings for the drill E, the screw-shaft F, and rod G, and are secured to the sides B B, within which they slide.

The screw F works in a nut secured in the bracket D, and is held at both ends inthe bearings g q in the drill-frame, so that, as the screw is turned, the drillframe is raised or lowered.

' The upper end of this screw-shaft has'a collar, K, secured to it by the'set-screwk, and immediately below this lcollar is asleevc, S, of which the disk M and earn O are a part.

The collar L is secured to this sleeve, and is p'rovided with arecess, o, into which the pin e in the npper collar K is pressed bythe spring f, so that, as the sleeve revolves, the shaft will turn with it.

Upon the upper face of the disk M there is pivoted a pawl, d, which is pressed against the collar upon the under sidefot' the bevel-gear P, andinto itsdepression h hy the spring e.

The rod Grl is held up bythe curred end Lof the trip-lever I, so that its' upper end presses against that part of the pawl which projects beyond the disk M, and holds itout ol' Contact with the bevel-wheel. This position of the disl; M and rod G is shown in fig. 1.

At the lower end of the drill E a shoulder, m, is formed, by a portion of the stock being turned smaller than therest, and against this smaller part the triplerer is held by the spring a. When it is in this position the end t of the lever is held under the rod G,

As the drill penetrates deeper into the rock the shoulder m will approach the end of the trip-lever until it strikes' it andforces it back. This will cause the end of the rod G to slip from the curved end t' of the lever, and the rod will be forced down belouY the disk M by the coil spring 1). The pawl d will then be free to engage with the bevel-gear P, and, as the latter revolves, the screw-shaft will turn with it and lower the drill-frame a certain distance.

XVhile the shaft li is thus being revolved the end l of the projecting` arm N upon the rod G will strike the lowersurt'ace ot' the cam O upon the sleeve S, and be gradually raised until tahe upper end of the rod strikes the pawl d and tliscngagcs it from 4the bevel-gear P, and the lower end rises above the end i of the triplever sufliciently to permitit to be thrownback again by `the 'spring n. .'lhus the hevel-gear P is free tore- /volve with the pinion Q, except when therod G is permitted to drop and release the pawl d, when the screw-shaft F and bevel-gear will turn together.

As the only connection between the collar L, secured upon the sleeve Sfand the `collar K upon the 'screw-shaft F, is thepin G (iig. 2,) itfollows that when l.the pi is raised from thel recess in the collar L the bevel-gear will turn, but the shaftF will remain stationary, so that hy'raisintr the pin c during the operation of the machine, the feed-motion of the drill will 'be arrested without interfering with the working of the machine, as the mechanism operating the drill and that turning the screw-shaft are entirely disconnected.

The feed motion of the drill is thus always under control, andinay be arrested or 'set in motion at any point by disconnect-ing the collar K from the collar L, I,as before stated.

The end of the screw-shaft F is provided with a handle T, by which it can be rotated when the pin c is raised in order to adjust the drill-frame to any desired position.

As the drill-frame is fed downward by the screwsh aft the curved end of the trip-lever I is caused to drop at which point it remains stationary until the-drill penetrates far enough into the rock to allow the shoulder an to strike it. It will thus be evident that the frequency of the operation of' the feed is governed by erating at shorter intervals-for soft rock and at longer ones for hard rock.

The stop J upon the stationary bracket D cani-be adjustedto stop the feed and the penetratinofth-e drill at any desired point, by setting it in suchfpositio'n below the pin u on the rod G that, as the drill-'frame is fed downward, the piu u will, att-'he :proper time, catch upon the stop J and prevent the rod G from dropping down tore'leasel the pawld,-the feedbelng a certain distance below the shoulder m upon the drill,

the penetration of the d rill into the rock, the feed op-.

set in motion at each time the rod G drops, is, in this' case, arrested'at the required time.. v

I am aware of the patent, No. 55,307, granted J nne 5, 1 S66,and.do not wish to be understood as claiming any part, device7 or thing therein claimed.

Claims.

Iclaim- 1v. The mechanism for automatically regulating the feed in drilling-machines, consisting of the rod G, with the arm N, and the cam O, and the vibrating lever I, constructed and operating substantially in the man` ner herein described and specilied.

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