US312304A - teaot - Google Patents

Description

(No Model.) v l 2 Sheets-Sheet 1.l

L. W. TRACY.-

HAND POWER ROOK DRILL.

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Patented Feb..l7, 1885.

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RAND POWER ROCK DRILL. y No. 312,304. Patented Feb. 17, 1885.

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- UNITED STATES LEWIS VrTRAOY, OF BROOKLYN, NEV YORK.

HAN D- POWER ROCK-DBI LL.

sPisCIFIcA'rIoN forming part of Letters Patent NQ. 312,304, dated February 17, 1885.

Appication tiled April 29, 1884. (No model.)

T0 all whom it may concern:

Be it known that I, LEWIs W. TRAcY, a citizen of the United States, and a resident of Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Hand-Power Rock-Drills, of which the following is a specification. l

This invention relates to hand-power rockdrills, and in its general features resembles the rock-drill for which I filed, under Serial No. 55,870, an application for United States Letters Patent on March 20, 1882.

The present improvements embrace a reciprocating lever movement by which rotating motion is imparted to the cam-shaft; a novel method of holding the drill, which passes entirely through the body of the machine, to receive the blows of the hammer directly on its end,instead vof being secured to a drill holder or plunger,as heretofore; a means by which the hammer can be swung out of its working plane to allow the drill to be withdrawn through the rear end of the machine, and also various improvements in the construction of the mechanical details, all of which will be fully described, reference being had to the accompanying drawings, in which- Figure l, Sheet l, is a plan view of my improved rock-drill. Fig. 2, Sheet l, is a longitudinal section. Fig. 3, Sheet 2, is a side view on a reduced scale. Fig. 4, Sheet l, is a transverse section on the line x x, looking Fig. 5, Sheet l, is a transverse section on the liney y. Fig. 6, Sheet 2, is a transverse section on the line z z. Fig. 7, Sheet 2, is a transverse section on the line x a', looking toward the right. Fig. 8, Sheet 2, is a transverse section on the line z z. Fig. 9, Sheet 2, is a side elevation, partly in section, of the lever movement with the hand-levers removed; and Fig. 10, Sheet 2, is a transverse section of the clutch mechanism for holding the drill.

The frame a a a', body b, threaded sleeve b', and mechanism b2, by which the sleeve b isintermittently rotated, are similar in construction to what is shown in my before-mentioned application. The drill-rod c passes entirely through the threaded sleeve b, and receives the blows of the hammer on its rear end, to which is clamped a clutch to connect it to the sliding and rotating sleeve cl, actuated by means of a tappet, d', on the cam-shaft e, to raise the drill from the bottom of the hole being drilled against the action of the spring di, and by a sliding spring-pawl, lf,which catches in the teeth of the ratchet-wheel d on the sleeve d, to partly rotate it by means of the tappetj", also on the cam-shaft c, striking the top of the slide f2, to which the pawl f is pivoted, said slide being again thrown up by the' spring f after the tappet has cleared the top of the slide f 2. The sleeved slidesin the bearing d", forming a part of or connected to the body b, and its front end lits in the end of the threaded sleeve b.v

The clutch, secured to the rear end of the drill-rod c, consists of a bush', c', provided with two pins which fit into bayonet-slots formed in the end of the sleeve d, as shown at Fig. 10, a split taper collar, c2, arranged inside the bush c, and the hollow clamping-screw c3, which, by being screwed in the end of the bush c', acts on the taper part of the collar c2, and so contracts it as to grip the drill-rod c vand cause it to move with the sleeve d.

To hold and guide the front end of the drillrod c, a guide-clamp consisting of two jaws, g g', is pivoted to the end of the threaded feeding-sleeve b', and held together by means of 8o the spring-catch g2, which is secured to thei end of one of them and catches over the end of the other one. The pin g3, xed in the end of the feeding-sleeve, insures that the guidehole in the two jaws, in which the drill-rod turns freely, shall be central with the feedingsleeve. rlhis guide-clamp may be opened after the drill has fairly started in the rock, as the cutting end will then be guided by the hole drilled by it.

In this machine it is the intention to withdraw the drill-rod c from and apply it to the machine through its rear end. To enable this to be done, the head h, secured to the body b by the rods h h and sliding on the rods a a of the main frame, is provided with a central hole, and the sliding hammer fi and its spring t" are adapted to be swung off sidewise on the right-hand rod a in Figs. 7 and 8 as an axis, the bearings of the hammer and the springplate/l2 being open bearings, and said parts are held down on the left-hand rod c by means IOO of the small bar j, which passes through a hole in the head 7L into a hole in the body b,

and is retained in-place by the split pin j.

To remove the drill the hammer il is moved back by the main cams e until the spring t" is suiiiciently compressed for the chain 3, one end of which is secured to the plate i2, to be locked over the stud t" on the hammer. The bar j is then drawn out at the rear, after its split pin j is removed, and the hammer and spring swung over sidewise. The guide-clamp g g is opened and the drill-rod moved back with the clutch c c2 c3 secured to it, said clutch being turned backward to allow the pins to leave the bayonet-slots in the sleeve d. rIhe clutch is. then removed from the drill-rod c by releasing the hollow bolt c3, and the drill-rod slid out through the hole in the head h. The nut-frame k is secured to the rods a a of the frame, and the feeding-screw sleeve b passes freely through a hole in its center, and a nutplate, k', fits into a mortise formed vertically through it. This nut-plate k has an elongated hole with a thread cut only in the lower part thereof, so that when it is dropped down the feed-screw sleeve b is free to slide through the nut-frame, and it is brought into the threads of the screw by means of the small lever-cam k2, pivoted to its upper end and bearing on the top of the nut-frame k when turned as shown at Fig. 5. Continuous rotary motion is imparted to the cam-shaft e from the hand-levers Z. Z through the medium of the connecting-rods m m. These rods m m connect arms on the leverholders nn to the cranks oo', placed diametrically opposite one another on the ends of the cam-shaft e. The leverholders rock on studs projecting from the sides of the head h, and have several perforated lugs on their sides, into any of which the handlevers can be Xed, according to the position in which the machine is placed.

'Io overcome the dead-centers of the cranks, springs are brought into play (when the cranks `fare on the back deadcenter) to bear against theunder sides of the connecting-rods mm, and so move the crank beyond the center. These springs p p are located in sockets formed on the holders n n', and press against plugs q q', fitted in the sockets. The projecting ends of these plugs q g come in contact with the projections r 1 on the under side of the connecting-rods m m when the hand levers and cranks are in their extreme backward positions, thus compressing the springs p p in the sockets of the holders n n', which by their resilience force the cranks over the dead-centers in the direction indicated by the arrow in Fig. 3, which also clearly shows that when one handle is in the backward position, as just described, the other is in the extreme forward position, from which construction and arrangement of parts it will be seen, referring to Fig. 3, that at the time when the cams e e release the hammer t the spring p is compressed by the' projection 1' on the connecting-rod m, thereby performing the functions of a cushion to the sudden stoppage ofthe hand-1ever and to the jar which would otherwise be imparted to the same by the rollers of the hammer tending to throw the cams suddenly forward as they leave their extremities, the same action occurring on the other side of the machine when the connecting-rod m is in its backward position, so that the springs acting on the connecting-rods perform other functions than overcoming the dead-centers of the cam-shaft; and it will be observed that they only act to overcome the dead-centers when their respective handles are in their backward positions, the forward dead-center of each connecting-rod being counteracted by the action of the other one,as they move in opposite directions.

The machine is held in the desired position on a suitable column or frame, part of which, s, Fig. 3, is shown attached to the rear plate, a', of the frame.

I do not claim, broadly, in this application the hand-lever movement shown and described, and by which a continuous rotary motion is imparted to the camshaft from an alternately-reciprocating motion of the two.

hand-levers, as the same will form the subject of another application.

Having now described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a hand-power rock-drilling machine, in combination, a sliding body,a transverselyarranged shaft carried thereby,provided with cams and cranks secured to its ends,two hand- `levers fitted to oscillate on the end plate of the sliding body, a spring-acting hammer sliding on the frame between the main portion of the body and the end plate, two connecting-rods by which they are connected to the cranks, and springs carried by the handlevers and arranged to bear on the sides of the connecting-rods when the cranks are in their backward position and just after the cams have released the hammer, substantially as and for the purpose set forth.

2. In a hand-power rock-drilling machine constructed to have the drill-rod passed longitudinally therethrough, a hammer and its spring holding-plate, fitted to slide on the side bars by closed bearings .-on one bar and open bearings on the other bar, and means, substantially as described, for holding the said open bearings in position, in combination, as

'and for the purpose set forth.

3. The body b, plate h, secured thereto by the rods h h, the hand-lever holders n ln,piv oted to the plate h, the connecting-rods m m', connecting the holders n n to the cranks o o, spring-acting plugs q q in the holders'n n,and arranged to bear-on the sides of the connecting-rods m m', the cranks o o on shaft e, carried by the body b, the cams e e and springacting hammer z', combined and arranged so that the hand-levers are alternately in their backward positions, with their respective IOO IIO

cranks on their dead-centers just after the cams have released the hammer, substantially as and for the purpose set forth.

4. In combination, the side bars, a a, the hammer t', sliding thereon,with open bearings on one side, springs t, located between the hammer and spring-plate 2, spring-plate i2, fitted to turn on one of the bars a, body b, plate h, rods h h', and retaining-rod j,passing through the plate h, and arranged to hold thev hammer and. spring-plate in their normal positions, substantially as and for the purpose set forth.

5. In combination, the sliding hammer t', sliding on the bars a a, With an open bearing on one side, and provided with stud it, the spring-plate 2, also sliding on the bars a a, with an open bearing on one side, the spring i', located between the hammer and springplate, the chain t3, secured at one end to the spring-platea, andhaving its other end adapted to lit over stud t4, and the side bars, a u, substantially as and for the purpose set forth.

6. The drill-rod c, bush c', fitting over the drill-rod and provided with side pins, split collar c2, located in the bush c', hollow bolt c3, fitting in the end of the bush e,for tightening the split collar on the drill-rod, and control ling-sleeve d, provided with bayonet-slots, in which the pins on the bush o t, substantially as and for the purpose set forth.

7. In combination,thehollowrotatingsleeve b and drill-rod c within the same, the centeringjaws g and g', secured to the end of the sleeve b', the centering guide-pin g3, and the spring-catch g2, substantially as and for the purpose Set forth.

In testimony whereof I have hereunto set my hand at New York, county and State of New York, this 24th day of April, A. D. 1884.

LEWIS W. TRACY.

Witnesses:

ALFRED SHEDLooK, H. D. WILLIAMS.

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