US1597413A - Rock drill - Google Patents

Description

G. LEE

Rocx DRILL Filed April 16, 1926 Aug. 24

I275 ATIORNEY.

Patented Aug". 24, 1926.

UNITED STATES 1,597,413 PATENT OFFICE.

GORDON LEE, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, I

OEJERSEY' CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ROCK DRILL.

Application filed April 16, 1926. Serial No. 102,486.

This invention relates to rock drills, but

.' rock drill strong and durable.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination 'of elements and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying vdrawings, in which" i v I Figure 1 is an elevation, in section, of a rock drill of the hand held type equipped withv acontrolling means constructed in accordance with the practice of the invention,

Figure 2 is a view of one of the grip portions, partly in section, illustrating one of the positions which the handle sleeve may assume in practice, and

Figure 3 is a view similar to Figure 2 illustrating the osition of the handle sleeve when the valve is fully open.

Referring to the draw-ings, the invention is shown' embodied in a rock drill of the 1 hand held type in which a cylinder A is provided with a free exhaust portvB. Within the cylinder A is arranged. a reciprocatory hammer piston C having a rearw ardly reduced extension D reciprocable in a bore E formed in the rearward portion of the cylinderA. f

A back head F forms a closure for the rearward end of the cylinder-and the forward. end of the cylinder is sealed in this instance by means of a front cylinder washer G interposed between'the front end of the cylinder and a front head'H. In addition to forming a closure for the front end of the cylinder A, the washer G also acts as a guide for an anvil block J ada ted to transmit the blows of the piston to a drill steel K supported by thefront' head H. The parts comprising the casing of the rock drill, namely, the cylinder A, the back head F, the front head H, and the front cylinder washer G may be held or clamped in operative position with respect to each other Y in any suitable manner, preferably by means of the usual side bolts, (not shown).

Pressure fluid for actuating the percussive element of the rock drill may be conveyed from a' source of supply throu h a conduit L secured to the back head F y means of a suitable connection 0. Such pressure fluid may pass to the rearward end of the bore E through a passage P.

The piston C illustrated in the drawings is of. the type which may be constantly exposed to pressure fluid at the'rearward end of the extension D. In this instance the extension D constitutes the means for distributing the pressure fluid to the ends of the cylinder A. Accordingly, a passage" Q, leading from the rearward rtion of-the bore E communicates at its ti'bnt end with the forward portion of the bore E for admitting pressure fluid to the rearward end of the cylinder to'impel the piston C forwardly. The extension D is provided with a reduced portion B so that when the piston approaches its rearward limiting position the front endof the passage Q will be uncovered to admit pressur e fluid to the rearward end of the cylinder.

The admission of pressure fluid to the front end of the cylinder A is in this in: stance effected through a passage S leading from the front end of the cylinder to communicate with the bore E at a point rearwardly of the forward end of the assage Q. The passage S like the passage (5 is also controlled by the extension D and is so positioned that at about the time the hammer .piston delivers its blow to the anvil block J,

pressure fluid will flow through the passage S into the front end of. the cylinder for returning the piston.

In accordance with the practice. of the invention a pair of lateralgrip portions T and U are formed integrally with the back head to serve as a means for supporting the rock drill and for holding it to the work. The grip portion U is preferably of somewhat smaller diameter than the opposed H to receive rotatably a-handle sleeve The sleeve V has smooth unbroken outer peri-' limiting endwise movement of the sleeve V ,in one direction. Any suitable means may be provided for preventingv accidental, re-

moval of the sleeve V from the grip U. .A

convenient means for accomplishing this isillustrated in the drawings in which awasher Y of substantially, the same diameter as the sleeve abuts the outer end of the sleeve and is held inposition by a bolt Z screwed into the end of the grip U. i

The-admission of pressure fluid conveyed to the backhead F through the conduit L is controlled by a throttle valve 6 in the back head. The throttle valve b may be located hold the valve closed.

Suitable means are provided to limit the rotative movement of the sleeve V on the grip portion U. To that end faces f and g are formed longitudinally of thesleeve ada'cent the ends of the cam face W. In the present instance the face f is adapted to contact withthe side of the push rod (1 when the sleeve V is rotated to a position to permit the valve 6 to rest on its seat, and the face 9 is 'ada ted to contact with the side of the push re (1 only when the valve 1) is fully open. If desired, a flat face it may be formed at that end of the cam face W nearest the face 9 so that when the valve 6 has been opened to wide limits the sleeve V will be held against rotation by the action of the spring e.

substantial In the operation of the device, whenever it is desired to admit pressure fluid into the clym linder A for reciprocating the piston O, t e sleeve V may berotated in a counterclockwise direction as viewed from the right hand side of the figures. Such rotation of the sleeve will cause the cam sunface W to ride on the outer end of the push rod (1 and will force the valve b from its seat. Continned rotation in this direction of the sleeve V; will carry the flat surface It to cont-act with the end of the push rod 11 and the sleeve V may then be released by the operator and will be held securely against rotation by the pressure of the spring e. e

The advanta es of this invention reside chiefly in the act that the perimetric surface of the grip portions T and U may remain y unbroken throughout their lengths. This construction renders these 'p portions strong and eliminates the unue breakage thereof which frequently occurs in drills of this type. By means ofthe controlling 'mechanism hereinbefore de-- able advantageof this construction is that .the operator -may at all times apply full pressure tothe handle of the drill with both hands without necessitating the frequent release of one of the grips, or a change of position of his hands, for the purpose of manipulating the pressure fluid controlling element.

I claim: a v

1. In a fluid actuated rock drill, the combination of a cylinder, a reciprocatory hammer piston in the cylinder, a back head for the cylinder, grip portions on the back head forming a handle, a throttle valve in the back head for controllin the admission of pressure fluid to'the cyhnder, an extension on the valve, a rotatable handle sleeve on one of the grip portions said sleeve having smooth unbroken outer perimetric surfaces throughout its length, and a cam on the end face of the sleeve to abut the extension for opening and closingthe valve.

2. In a fluid actuated rock drill, the combination of a cylinder, a reciprocatory hammer piston in the cylinder, aback head for the cylinder, grip portions on the back head forming a handle, a throttle valve located transversely in the back head for controlling the admission of pressure fluid to the cy.inder, an extension on the valve, a rotatable handle sleeve on one 6f the grip portions, a cam on the inner end face of the sleeve to abut the valve extension for opening and closing the valve, a shoulder on the back head to limit endwise movement of the sleeve in an inward direction, and a bolt in the handle to hold the sleeve against re moval from the .handle.

. 3. In a fluid actuated rock drill, the combination of a cylinder, a reciprocatory hammer piston in the cylinder, a back head for the cylinder, lateral grip portions on the back head forming a handle for manipulating the rock drill, said grip portions having smooth unbroken perimetric surfaces, a throttlevalve located diagonally in the back head for controlling the admission or pressure fluid to the cylinder, an extension on the valve extending through the back'head into the handle, a sleeve rotatable on.the handle, a cam on the inner end face of the sleeve to abut the valve extension for unseating the valve, a shoulder on the back head for limiting-endwise movement of the sleeve in arr-inward direction, means for preventing removal of the sleeve from the handle, a spring for closing the valve upon release of the sleeve.

Intestimony whereof I have signed this specification.

GORDON LEE.

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