US 317949 A
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Description (OCR text may contain errors)
V3 Sheets-Sheet. 1. B. A. LEGG.
No. 317,949. Patented Mey v12, 1885.
.dttarnel/S (No Model.) 3 Sheets-Sheet .2.
B. A. LEGG.
ROCK DRILL. No. 317,949. Patented May 12, 1885.
WIM/ESSES J'Jvr/EJVTOR a@ Q @M Wm Q. L77
v K 3 Sheets--Sheet 3. B. A. LEGG.
No. 317,949. Patented May 12, 1885.
.To' all whom, t may concern:
Fig. 3 is-a central vertical section.
of the screw-shaft to the nut-sections.
and a supplemental bracing-frame.
lUNirE TATES ArENfr Erice.
BENJAMiN A. LEGG, or coLUMBus, oHio, AssicNoE To JosErri A. JEEEEEY, oE sAME PLAGE.
SPECIFICATION forming part of Letters Patent No. 317,949, dated May 12,1885.
Be it known that I, BENJAMIN A. LEGG, a citizen of the United States, residing at Golumbus, in the county of Franklin and State of 5 Ohio, have invented certain new and useful Im- 1o parts of the drill, the screw-rod being shown in section. Fig, 2 is a rear view of the same. Fig. 4 is a top plan View, the Vsupporting-frame being shown in section. Fig. 5 shows the relation Fig. 6 illustrates the connection between the braces or legs of the frame and the screw-rods which engage therewith. Fig. 7 is a side view of the machine complete, except as to the drill 2o or bit, which is partly broken away.
y In the drawings I have shown the drill and the devices for operating it as being mounted in an improved frame or support which I have devised. llhis consists ofthe main frame The main frame has the parallel bars A A, preferably' rounded at the top and bottom to form conn'ections, as at A.
B B are screw-rods, one at the top and one 0 ,at the bottom, rigidly secured to the main frame, they being adapted to receive the braces C C', which latter are shod with points orprojections, by means of which they can be fastcned directly to the roof and iioor of a mine,
. 3 5 or to other upper and lower holding-surfaces.
C2 G2 are hand-wheels by which the parts C C can be rotated, the latter having external threads, which engage with the rods B B.
. To this main frame there is secured a sup- 4o plemental frame consisting of two side bars,
E E, preferably curved about as shown, and having their upper and lower ends bolted to the side bars of the main frame.
E is a yoke or stirrup, the bars of which l4 5 are hinged at e to the supplemental frame,` this yoke carrying the screw-rod E2, which 5o same rod E2, and a hand-wheel, e.
In the main frame A A is hinged or mounted F and moving relative thereto.
the support for the drill and its feed-screw,
and the bed-frame which carries the parts by which power is imparted to the drill.
F represents a plate, from the lower side of which there projectsi a tubular support, F. ff are projections provided with sockets at f', into which are fitted 4with requisite .tightness the pivots or screws f2 f 2, these engaging with threaded sockets f3 f3 in the main frame. Upon these the drill and the operative parts can be rocked so as to throw the point of the drill up or down, as required. The drill may be,in construction, of any well-known or of any preferred style.
The heel is seated in a socket formed in the end of the feed-screw G. The part which directly supports the feedscrew, and at the same time imparts rotation thereto, is the hub H of the wheel vI:I and a sleeve, H2, which projects inward from the hub, and is mounted in the tubular support F. This hub or sleeve (or both of them) n'ts closely to the screw and has a spline or feather, which takes into alonf gitudinal groove formed in thefeed-screw G, vso't'hat when the wheel and sleeve turn they shall rotate the screw, and at the same time permit it to be moved longitudinally to force the drill into the rock.
The tubular support F is provided at one end with an outwardly projecting rim or ange, F2, its 'outside diameter being substantially the `same as the outside diameter of the hub H.
h h are clips screwed fast to the hub and overlying the flange F, and extending over the corner1 of the flange, as plainly shown in Fig.-3, so as to confine the parts in proper working relation. Of course any desired number of these clips may be employed.
Thev feed-screw is caused to move longitudinally by means of a nut formed in two parts, I I, said parts being supported upon the plate As shown, the said parts of the nut consist each of a semicylinder. Each of these is formed with or secured to a plate, i i, which plates are secured to the plate Fby a dovetail joint, so that they can be movedrelatively thereto. Each plate i has apin, i.; projecting upward through a slot, i2, inthe `plate F, and with these pins there engages a lever, J, having a cam-plate,
j, at the end. c In this plate there are slots jj, into which enter the pins i. The' lever-plate is mounted upon a stud, F3, carried by the plate F, and the slots j j are struck from centers eccentric to the stud or pin F3.
It will be seen that when the lever J is moved in one direction the pins c" will be drawn inward toward the plane of the screwshaft, and when the lever is moved in the opro posite direction they will be thrown outward. With them will move the nut-pieces I I into or out of engagement with the shaft G.
The wheel H, which, as above said, rotates the feed-screw, and with it the drill, is in turn r 5 rotated by the main power-pinion K. This is mounted upon a shaft', K, which passes th rough 'the center of the engine-cylinder L. This cylinder is mounted upon and rigidly secured to the above-described plate F, the lateral wall Z 2o of the cylinder being preferably cast with a supplemental plate, L', which projects sufficiently far to receive the bolts at Z. As shown, the cylinder is cast with said side wall, Z, and one end or face wall, Z', integral. The other end or face wall, Z2, is formed separately from the cylinder and subsequently bolted thereto. At Z3 there is a hollow cylindrical offset, in which the end of the shaft K is mounted. rllhe wall-plate Zz is formed with a journal-cylinder, Z5, on the exterior of the end which is a screw-thread, which engages with the threaded cap Zt, and through this cap passes the said shaft K.
The shaft K carries the piston M, which consists of a cylinder, preferably of substantially the dimensions shown. rlhe shaft K passes through it eccentrically, it being so arranged relatively to the shaft and to the interior face of the cylinder that it always pre- 4o serves a tight joint with said interior surface.
Above the cylinder is the chest N, which initially receives the steam, compressed air, or other motive agent, this chest having a coupling-piece at N', to which a pipe or rubber hose, O, may be secured.
P represents the abutment or cut-off, the lower edge of which is permanently in contact with the surface of the piston, and which is constructed with the feed-portp, for the steam 5o or air. One end of said port is permanently in communication with the interior of the steam-chest, and the other end delivers the steam to the rear side of the piston.
At Q the exhaust-port is situated, the inner end of it being as near as -practicable to the abutment l?. At the outer end of this eX- haust-port there is a coupling, to which, if desired, may be attached a pipe or hose.
The method of operating the machine will 6o be readily understood: The main frame isiirst set and properly braced above and below, and the supplemental brace at the rear is made rigid in the required position. The parts of the nut I I are Withdrawn from the shaft, and
the latter is drawn back, if necessary, and after this the nut-pieces I I are again brought linto engagement with the screw. If steam or air be admitted to the chest N ,the piston will be caused to revolve continuously, it imparting at each of its rotations one to the pinion K. The latter engages with the internal teeth:
of the wheel H, which in turn revolves the feed-screw. As the screw revolves it is caused to advance by reason of the engagement of the nut withits thread.
I am aware of the fact that prior to my invention use has been made, in constructing mining-machines, of some of the elements separately considered-such as a screw-shaft, pivoting devices for joining the shaft to the main frame, Ste.; but I believe myself to be the iirst t0 have devised a machine manifesting the constructions and combinations appearing in the claims below.
The screw is shown in the drawings, and is above described as resting entirely upon the hub or sleeve H2 ofthe gear-wheel H; but said hub or sleeve need not be as long as represented, and the screw could have a supplemental tubular bearing or support which would be nonrotary. The screw is supported, it will be seen, independently of the nut.
Use has been heretofore made of -nut-sections adapted to be attached to and detached from a screw-shaft, these being shown, for instance,in Patent No. 250,370, to F. M. Lechner, andI do not claim, broadly, such devices as are therein shown; but in my construction the nutsections are arranged to slide rectilineally 4toward and from the shaft, they being supported independently of the levers which operate them. In mechanisms of the character rshown in said patent the nuts are arranged to swing in circular paths, and they are more or less supported upon the adjusting devices. By having them arranged as mine are, they can be held positively and independently of the adjusting-lever.
Some of the advantages which I attain with the two nut-sections might be reached with a single nut, especially if it be arranged to slide rectilineally. I prefer the tongue-and-groove joint, though other means of uniting the nut and the bed-plate will readily suggestl themselves which are the equivalents thereof. By having the elongated handle J the cam-plate j can be operated very readily. Y
As the engine is situated centrally relatively IOC) to the screw, the power can be applied advantageously vand the weight of the various parts uniformly distributed.
rIhe offset frame E enables me to apply the rear Y-shaped bracing-frame to greatadvantage, and I can bring the arms of the latter together and employ a single foot-brace without interfering with the operative parts.
, What I claim is- 1. The combination, with the drill, the screw-shaft, land the tubular bearing through which the said shaft passes, of the expanded bed-plate or support secured to said bearing Aand pivotally connected to the frame, a rotary engine mounted upon the said bed-plate or support, the gear-wheel mounted upon the axis of the screw, and the power-shaft connected directly with the piston, and also directly with said gear-wheel, substantially as the expanded bed-plate or support connected with said vtubular bearing and pivotally joined to the frame, the engine mounted upon said bed-plate or support centrally relatively to the screw, the gear-wheel mounted on the axis of the screw, the mechanism which connects the engine with the gear-wheel, and means for detachably connecting the screw with the main frame, substantially as set forth.
3. The combination, with the drill, the screw-shaft which carries the drill, the tubular bearing or holder through which said screw passes, and the main frame, of the expanded bed-plate or support secured to said tubular bearing or holder, the engine mounted upon @said bed-plate or support, the gear-wheel mounted upon the axis of the screw, and the pointed screws on the frame providing ad justable pivotal supports for the said bedplate and tubular shaft-holder, ksubstantially as set forth.
4. rllhe combination, with the rotating drill and the screw-shaft which carries the drill, 'of the support for said shaft, and a detachable nut secured to said support by a tongueand-groove joint, substantially as described.
5. The combination, with the rotating drill, the screw-shaft which carries the drill, the support for said screw-shaft, and ,the lever having an elongated handle, of a nut supported on the frame independently of the lever, and arranged to slide rectilineally toward and from the shaft, substantially as set forth.
6. The combination, with the rotatingdrill, the screw-shaft which carries the drill, a support for said screw-shaft, the cam-plate supported upon the frame, and an elongated lever connected therewith, of the nut formed in two rectilineally-moving sections supported from the frame independently of the camplate and lever, vand loosely connected with the latter, substantially as set forth.
7. The combination, with the rotary drill, the screw-shaft which carries the drill, and the cam-plate, of the removable nut-sections supported independently of the said cam-plate,
Aand a tubular support which holds the screw independently of said nut-sections, substantially as described.
8. The combination, with the drill, the screwshaft, and the tubular bearingI for the screw, having a lange, F2, at one end, of the gear-wheel having its hub mounted within the said tubular bearing, and the clip or clips which engage with the said fiange, substantially as set forth.
9. The combination, with the main frame having the adjustable braces for securing it to the top and bottom of the mine, of the offset frame E and the rear bracing-frame havingthe upper Y-shaped part pivoted to the main frame, and having an extensible brace at the bottom, substantially as set forth.
In testimony whereof I afiix my signature in presence of two witnesses.
BENJAMIN A. LEGG.
CHARLES W. MILLER, 1 C. WELLING.