US372143A - Rock or well drilling machine - Google Patents

Description

(No Model.)

' 0. HARMAN.

ROCK OR WELL DRILLING MACHINE.

No. 372,143. Patented Oct. 25, 1887.v

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UNITED STATES PATENT OEErcE.

CHARLES HARMAN, OF TIFFIN, OHIO.

, ROCK 0 WELL DRILLING MACHINE.

SPESJIFICATION forming part of Letters Patent No. 372,143, dated October 25, 1887.

Application filed Ap2il J3, 1887. Serial No. 235,910.

To all whom it may concern.-

Be it known that 1, CHARLES HARMAN, of Tiffin, in the county of Seneca and State of Ohio, have invented certain new and useful Improvements in Rock or Well Drilling Machines; and I do hereby declare the following to be a full, clear, and exact description of of the invention, such as .will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in rock-drilling apparatus; and it consists in cer tain features of construction and in combina tion of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings. Figure l is a side elevation of my improved drilling-inachine. Fig. 2 is a front end elevation of the Fig. 3 is a rear end elevation. Fig. 4 is a front end elevation with the clutch mechanism removed, the clutch-levers showing in Fig. 5 is a plan View. 1

A represents a suitable supporting-base, to which is rigidly attached an upright bar, B, the edges of the latter serving as ways for the vertically-reciprocating cross-head O.

D is the driving-shaft, the same being journaled in suitable boxes connected with the base. This shaft is provided with a driving-pulley,

D, or with other mechanism for transmittingpower to the shaft. Mounted on the other end of the shaft is the crank D", the latter being connected by pitman d with a cross-head, O, for reciprocating the latter. The cross-head has gibs O, of considerable length, to give ample wearing-surface and to insure a steady movement of the crosshead on the ways as against a rocking tendency of the cross-head. The ends of the cross-head extend outside of the line of the gibs. These projecting ends are slotted, forming jaws c, for receiving, respectively, horizontal levers E, bolts or-pins 0 being made to extend through the respective levers E and the embracing-jaws 0, such bolts or pins forming fulcrums for thelevers. These levers at the front end terminate in heads E, for holding the clamping-jaws F. These jaws on their inner faces are grooved lengthwise to approximately fit the drill-rod G, and on their outer faces have ribs f, inclined, as shown, to the inner faces of the jaws. These ribs in cross-section are preferably T-shaped and optheir normal position.

(No model.)

crate in correspondingly-shaped and inclined grooves 6, made in the heads E, as shown in Figs. 2 and 5. With the heads E held stationary, it is evident that by reason of the inclined ways f thejaws F may be made to ap proach or recede from'each other by depressing or elevating thesejaws.

Springs f are located substantially as shown in Fig. 2, and are connected, respectively, with heads E, and engaging-jaws F, to hold the latter in their normal or elevated position, with the center of thejaws somewhat above the center of the heads. These heads, when made to approach each other by the operation of a toggle-j oint located at the rear end of the levers E, and hereinafter described, close the jaws F sufficiently with the latter in their normal or elevated position to grasp and elevate a drillrod ofmoderate length. If, however, the dri1lrod in drilling deep holes has been lengthened and its weight thereby increased, so that the grasp of thejaws,with thelatter in their normal position in the heads,will not elevate the drill-rod, the jaws, as the cross head commences its upward movement, slide down ward in the heads E, and by reason of the inclined ways f the jaws are wedged against the drillrod with a force greater or less, according to the weight of the latter, but always sufficient to preclude the possibility of the drill-rod slip ping between thesejaws. hen thejaws have opened by the collapse of the togglejoint aforesaid, the spring f at once elevates thejaws to The said toggle-joint and connected mechanism are as follows: H is an upright rod located midway between the levers E and near the rear end of the latter. The rodis rigidly secured to the bed. The upper and lower portions of the rod are screwthreaded, and provided with j am-nnts or'tappets h and h, the latter being screw-threaded, making them adjustable lengthwise of the rod. These tappets form abutments for the sleeve I, the latter being made to slide on the rod H.

To opposite ends of this sleeve are jointed bearings i, that are seated in corresponding sockets, 0, made on the inner faces of the levers E.

Near the lower end of the downstroke of the cross-head the sleeve I strikes the tappets h, after which, as the cross-head descends a little farther, the arms 1', by their engagement with the levers E, are tilted downward and brought in line with each other, such distention of the arms iof course causing an outward movement of the engaging end of the levers E, thereby causing the forward ends of these levers to approach each other, causing the jaws F to grip the drill-rod. In this position of parts the drill-rod is elevated with the cross-head. Near the end of the upward movement of the crosshead the sleeve I strikes the tappet h, causing the arm 2' to be tilted to the inclined position shown in dotted lines, Fig. 3, the rear ends of the levers being drawn toward each other by the tension of the spring J, the latter being located just inside the line of the togglejoint in position extending from one lever E to the other, and being attached to both levers. WVith this construction the tension of the spring J prevents lost motion of the parts. as would otherwise occur from wear in case the leversE were moved in bolh directions by the action of the toggle-joint.

In operating the machine, by revolving the shaft 1) the cross-head O is reciprocated, and by means of the mechanism hereinbefore described the drill is lifted with the upward movement of the crosshead and allowed to fall by gravity when the cross head has reached the end of its upstroke.

\Vhat I claim is 1. The combination, with a vertically-reciprocating cross-head and suitable crank and pitman for operating the same, of horizontal levers pivoted to the crosshead, said levers having jaws mounted thereon for grasping the drill-rod, a toggle-joint for operating the said levers, and tappets arranged above and below the togglejoint for operating the latter, substantially as set forth.

2. The combination, with a vertically-reciprocating cross-head, levers pivoted to the crosshead, and toggle-j oints for operating the levers, substantially as indicated, of jaws mounted on the said levers, the said jaws having inclined ways made to operate in corresponding ways in the respective heads of the levers, the ways of a pair of jaws being made to converge as they extend downward, substantially as set forth.

3. The combination,withacross-head,lcvers pivoted to the cross-head, and jaws mounted on the levers for grasping the drill-rod, the parts being arranged substantially as indicated, of a toggle-joint for pressing one end of thelevers outward and aspring connected with the levers and made to act in apposition with the thrust of the togglejoint, substantially as set forth.

4. The combination, with a vertically-reciprocating cross-head, lateral arms pivoted to the cross-head, jaws mounted on the levers for grasping the drill-rod, and a toggle joint for operating the levers, substantially as indicated, of a sleeve connected with the togglejoint and made to slide on an upright stationary rod, and adjustable tappets mounted on the rod for engaging the sleeve to operate the togglejoint, substantially as set forth.

5. The combination, with cross-head, levers, toggle-joint, and mechanism for operating the latter, substantially as indicated, of jaws mounted on the said levers for grasping the drill-rod, said jaws having inclined ways converging downward, said ways being made to operate in corresponding grooves of thelcverheads, springs connected with the respective lever-heads, and engaging-jaws to hold the latter, when free, in their normal or elevated position, substantially as set forth.

In testimony whereof I sign this specificatiou, in the presence of two witnesses, this 5th day of March, 1887.

CH ARLES HARMAN.

Witnesses:

WM. HARMAN, W. H. BLASIUS.

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