US1844874A - Feeding device for percussive motors - Google Patents

Description

VENTORS Flled June 27 1930 QJ 3w w A. SMITH, sR., ET Al.

FEEDING DEVICE FOR PERCUSSIVE MOTORS Feb. 9, 1932.

- ends of its strokesp' v Patented Feb. 9, 1932 I Un ts! STATES PATENT f orrlce WILLIAM A. SMITH, SR, or EASTON, PENNSYLVANIA, AND GEORGE H. s mme PHILLIPSBURG, NEW' JERSEY, assIeNons TO INGnRsoLL-nANn COMPANY, or JEBsEYoITY; Nnw'JEBsnY,.A CQRPORAIION OENEW JERSEY FEEDING DEVICE Foe rnn onssivn Morons Applicatien filed June 27,

This invention relates to feeding devices, but more particularly to a device of this character adapted for advancing and retracting a percussive motor on its support and whereon motors of this type are usually mounted to assure the correctposition of the motorwith respect to the work.

. One obj ect of the invention is to enable the percussive motor to be moved longitudlnally of a support or mounting by the force'or ar imparted to themot'or by the hammer piston upon reversal of the hammer piston at the Other objects will bein part obvious and in partpointed out hereinafter.

In the accompanying drawings illustrating the invention and'in which similar reference characters refer to similar parts,

Figure 1 is a side elevation partly in sec-' tion of the feeding device and also a portion of a percussive motor and its support, and

Figures 2 and 3 are transverse views taken through Figure 1 on the lines and 33 respectively looking in the direction indicated by the arrows. V

Referring more particularly to the drawings, A designates a percussive motor, such a as a rock drill, and B a support for the motor illustrated as a shell havinginternal longitudinally extending guideways C to receive slidably guide ribs D carried by the motor A The motor A, only a portion of which is shown, comprises a cylinder E having there in a piston chamber F to accommodate a hammer piston G reciprocable in the piston chamu-j.

ber F to deliver blows of impact to a work ing implement, as for example, a [drill steel (not shown), p p

On the rear end ofthe cylinder E is ar- ,r 1 th :11 b ck head H which forms V mngec a 'ment of the intermediate portion of the rod well known manner;

1930. Serial no. 464,219.

as the valve, has been omitted from the drawings, but it is to be understood that the same may be of any suitable type for effecting the distribution of pressure fluid to the ends of the piston chamber F to actuate the pistonG. In accordance with the practice of the invention the motor A is: provided with means adapted to'alternately seize and release a fixed element on the support to enable the motorto be actuated longitudinally of the support B by the force of the jars resulting from the act of reversal of the hammer piston G in the extremities of the piston chamber F. The means provided for this purpose includes a rod L which is preferably of cylindrical shapeso that the surfacethereof may serve as agripping surface 0 for clamp means designated generally by P and adapted to be actuated longitudinally of the rod by the motor A.

The rod L which preferably extends throughout the entire length of the support Blnay be secured at its front end to the support in anysuitable and convenient manner and in the present instance extends. rearwardly of the support. The rear end of the rod L may be fastened to a cross head Q. as by means of a nut R threaded on the end of the rod L. The cross head Q, as is the usual practice, is supported by and held in spaced relation with respectto the rear end of the support B by means of the usual rods or bolts S having sleeves T, arranged thereon to act as spacers and which spacers may abut with one end against the rear end of the support B and with their other ends against the cross head Q. v

In order to prevent undue vibratory moveis in this instance threaded and extends rearwardly of the lug W to receive a nut Y whereby said bushing may be securely clamped in position.

Disposed at the rear end of the rock drill A is a .casinr-Z having front and rear laterally exten ing flanges b and 0 wherein are apertures d and e respectively. The aperture e is suitably proportioned to receive the rod L and the aperture 11, beingof somewhat larger diameter than the aperture 0, is adapted to receive the bushing U. The flange b may accordingly be seated against the lug and be clamped thereto by means of the nut Y so that the casing Z will be held rigidly in fixed position with respect to the motor A. [llhe clamp 1111811118 P preferably consists of a bnshin split longitudinally to form a pair of 'hfil' -sec.tions f, each half-section having rear-mid firont coniform :portions or extremities and h respectively, and between the coni m portions {1 and h are external grooves to receive a yoke whereby the clamp means P may be actuated longitudinaill of the casing Z. In the interior of the lml ssections fare recesses 0 shaped to conform to the surface 0 of the rod L which the clamp means P are "intended to grip.

The means :provided for causing the clam p means-Pto exert a gripping action on the rod L consists of a pair of cup shaped members 1) and 9 arranged at the rear and front ends respectively of the clamp means P. The cusps p and g are identical in all their .essem tinll respects, :each cup being provided with a coniform socket 1' to receive the coniform portion of the clamp means :adjacen't thereto.

The cups p and q are further provided with recesses s for the reception of springs t which act against the abutments of recesses 8 with amend and with theot-her end against the clamp means P to exert a constant pressure against the cups for maintaining them in substantially fixed position with respect to the casing Z.

In the ends of the cups 1) and g, remote from the clamp means P, are suitable apertures u to receive the rod L whereupon the cups are intended to slide. The arrangement is such that the spring It will constantly ant to maintain the cup 7) firmly seated against the :flange 0, and the spring If within the cup q in this instance acts to press the .cup (I firmly against the 'rear end of the bushing U.

Convenient means may be provided for actuafiingfithe clamp means P relatively to the casing Z in order to enable said clamp means P to be pressed into gripping relationship with the rod L by either the cup p or 9, depending upon the direction in which it is intended to actuate the motor A. The means illustrated for this purpose is adapted to be actuated manually and comprises a rod "2) slidable within a bore 'w in the casing Z.

The rod 1; is preferably provided with a reduced portion a; which extends through an aperture 3 in the yoke iv. The front end 2 of the rod "0 may be suitably threaded to receive a cylindrical nut 2 which slides with in the bore w to serve as a guide for the front end of the rod.

The nut 2 further acts as a seat for one end of a spring 3 which is disposed about the reduced portion w of the rod '0 and acts with its other end against the yoke 7c. A spring 4 similar to the spring 8 is disposed rearwardly of the yoke 70 against which it acts with its front end and bears with its rear end against a shoulder 5 on the rod o and located at the rear extremity of the reduced portion m of the rod v.

Secured pivotall. as by means of a pin 6,420 the rear-endo the rod 0) is-a. link 7 having an aperture 8 to receive a pm 9 arranged eccentrically with respect to and carried by a shaft 10 which is ijournaled in a bearin 11 on the rear end-of-thecasing-Z. On the aft 10 is a manipulating lever 12 for actuating the rl'fld v and thus also the clamp means P relatively to the casing Z.

The operation of the device is as follows: Let it be assumed that it is intended to actuate the motor A forwardly in'the direction of the work. In such case the lever 12 may be actuated in a direction to compress the spring 4 andrthusythrou the medium of the spring 4 and the yoke move .the clamp means P forwardly so that the coniform portions h of the half-sections will bear against the socket met the cup 9. In this position of the clamp means P the cup .12 will be held out of contact from the clamp means P by the spring t within the cup p.

With the hammer .pistonG in operation, the motor A will be held against rebound upon reversal of [the hammer piston at the end of each rearward stroke thereof since, upon such reversal, the jar resulting therefrom will merely cause the cup 9 .to force the clamp means P, that is, the half-section .f, to grip the rod L tightly. Asa result, the motor A and the elements afiixed thereto, such as the casing Z-will be held momentarily stationary.

Upon the forward stroke of the piston G, however, the jar imparted to the motor A by the piston G will cause the motor -A to move -bodily forwardly in the direction of the work in accordance with the penetration of the working implement into the work. The cup q will then momentarily release the clamp means P and as a result the said clamp means will also be moved forwardly along the rod L to a new position in readiness to .againbe gripped by the cup 9 at the end of a subsequent rearward stroke of the hammer piston G. In this way the motor A will be advanced in the direction of the work'until the working implement has penetrated the work to the desired depth. The motor A may then be retracted by means of the force or jar to which it is subjected by the ham under compression. This movement of these elements will shift the position of the clamp means P so that the coniform portions 9 thereof will be brought into contact with the socket r in the cup 17.

WVith the clamp means P in this position the cup 79 will serve to press the clamp means P firmly against the rod L which the said clamp means will then grip each time the.

piston reverses its direction of travel in the front end of the piston chamber F, so that the motor A will then remain stationary.

When the piston G moves rearwardly and upon reversal thereof at the end of its rearward stroke the jar resulting from the act of reversal will move the motor, together with the clamp means and associated elements, rearwardly upon each rearward stroke of the hammer piston G until the motor A has reached the rearward limit of its travel,

thus withdrawing the working implement from the work.

In such instances where it may be found,

practical or desirable to lower the motor A by the force of gravity, as for instance, when the motor and its support occupy inclined positions the rod 4; may be actuated to a neutact from the cooperating coniform sockets of the cups p and g. The motor A may then descend of its own weight or, when lying in a horizontal position, may be manually moved along its support to the desired posi: tion with respect to the work.

We claim: I

1. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto upon reversal of the piston for actuating the motor longitudinally of the support, a rod on the support, clamp means carried by the motor and being slidable on the rod, and means associated with the motor and being adapted to selectively engage the opposite ends of the clamp means for actuating the clamp means into engagement with the rod to prevent recoil of the motor upon-reversal of the piston.

2. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto upon reversal of the piston for actuating the motor longitudinally of the support, a rod on the support, clamp means'carried'by the motor and encircling the rod, and socket means carried bythe motor and being'slidable on the rod to engage the ends of the clamp means for actuating the clamp means into engagement with the rod to prevent recoil of the motor upon reversal of the piston.-

3. In a feeding device, the combination'of, a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in themotor imparting jars thereto for moving the motorrelatively to the support, means on the support forming a gripping surface, clamp means carried by the motorand encircling the first said means, means encircling the clamp means and being movable relatively to the clamp means to actuate the clamp means into engagement with the gripping surface for preventing recoil of the motor, and control means for actuating the clamp means relatively to the motor. I

4. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motorimparting jars thereto for moving the motor relatively to the support, a rod on the support, a casing carried by the motor, clamp means in the casing and encircling the rod, abutments in the casing arranged at opposite ends of the clamp means, control means for moving the clamp means into engagement with the abutments to press the clamp means into gripping relation with the rod, thereby preventing recoil-of the motor, and control means for actuating the clamp means relatively to the motor.

5. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatory hammer piston in the motor imparting jars thereto for moving the motor relatively to the support, a rod on the support, a casing carried by the motor, a split bushing in the casing and encircling the rod, a pair of oppositely directed coniform portions on the bushing, abutment means in the'casing having coniform sockets to receive the coniform portions, and control means to actuate the bushing into the sockets whereby said bushing will be pressed into gripping relationship with the rod to preventrecoil of the motor.

6. In a feeding device, the combination of a motor and a support whereon said motor is slidably mounted, a reciprocatoryhammer piston. in the motor imparting jars thereto for moving the motor relatively to the support, a rodon the support, .a casing carriedby the motor, clamp means in the casing encircling the rod and comprising a pair of half-sections having coniform extremities, cups in the casing having coniform sockets to receive the coniform extremities for pressin}; the half-sections into gripping relationship with the rod, springs interposed between the clamp means and the cups to hold said gaps against movement relatix ely to the easmg, a yoke in the casing engaging the halfsoctions, and control means acting againstthe yoke for moving the clamp means into gripping relation with the cups and the rod or preventing recoil of the motor upon reversal of the piston.

In testimony whereof we have signed this specification. WILLIAM A. SMITH, SR.

GEORGE H. FUEHRER.

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