US1701631A - Locking device for steel retainers - Google Patents

Description

Feb. 12, 1929. 1,701,631

v F. M. SLATER LOCKING DEVICE FOR STEEL RETAlNERS Filed May 2, 1927 avg/W011. EmdM dlatez Patented Feb. 12, 1929 UNITED STATES 1,701,631 PATENT OFFICE.

FRED M. SLATER, or nAsToN, PENNSYLVANIA, AssIeNon T0 TNenasoLL-nANn com- PANY, or aunsny CITY, NEW JERSEY, A CORPORATION on NEW JERSEY.

LOCKING DEVICE FOR STEEL RETAINERS.

Application filed May 2, 1927. Serial No. 188,201.

This invention relates to pneumatic tools, but more particularly to axsteel retainer and means for locking the same in operative position on the tool.

The object of the invent-ion is to insure a tight connection between the tool and'the steel retainer.

Other objects will be in part obvious and in part pointed out hereinafter and to all of these ends the invention consists of the combination of elements andv arrangement of parts having the general mode of operation substantially as hereinafter described and claimed and illustrated in the accompanyingdrawings, in which Figure 1 is an elevation, partly in sect-ion,

of the front end of a pneumatic tool equipped with a lockingdevice constructed in accordance with the practice of the invention,

Figure 2 is a perspective view of the retainer spring, and V Figure 3 is a transverse view taken through Figure 1 on the line 3-3 looking in the dircction indicated by the arrows.

Referring to the drawings, the invent-ion is shown applied to a pneumatic percussive tool, only the front end of the barrel A of which is shown to illustrate a practical application of the invention. A bushing B forms a closure for the front end of the barrel A and has a bore O to receive and guide the shank D of a working implement E. Preferably, the bushing B is provided with a flange F at its front end to abut the front end of the barrel A for preventing inward movement of the bushing B with respect to the barrel A. The flange F also serves as an abutment for a collar G carried by the working implement E to liinitthe distance which the shank D of the working implement may extend into the barrel A;

According to the present invention, the front end of the barrel A is provided with external threads H in engagement with threads J formed in the rearward end of a cap or nose piece K screwed on the front end of the barrel A. Formed in the nose piece K is an annular recess L int-o which recess extends the collar G of the working implement. The front end 0 of the recess L is preferably reduced somewhat in diameter to form a shoulder P on which is seated the flange Qv of a bushing R located in the end 0 of the recess to guide the working implement forwardly of the collar G.

i the nose As is well known, pneumatic tools of the type to which the present invention pertains are subjected to considerable vibration and jars during their operation, thus making it difiicult' to maintain part-s connected by screw threads in their proper assembled positions. To insure against such unscrewing of the nose piece from the barrel A in the pres ent instance, the rearward surface S of the nose piece is provided with a series of notches T having inclined longitudinal surfaces U and radial end surfaces or shoulders V. In these notches T is seated the loop of acoil spring X encircling the barrel A and having a hook at its opposite end which engages an aperture 3) in the side of the barrel A. The V coil spring may be of any-suitable material possessing the requisite resiliency and should consist of at-least one and one-quarter turns to insure against accidental release of the loop W from the notches T.

In order that the loop W may be readily pressed out of the notches T without the aid of special appliances or tools, said loop W is preferably so formed that when it is in its operative position, a portion thereof extends beyond the periphery of the nose piece K. Accordingly, in the present instance, the loop W is bent outwardly from the coil of the spring and slightly inclined downwardly with respect thereto for a portion of its length as at c. From the lowermost end of the portion 0 of the loop the wire of which the spring is formed is bent inwardly to form a hook (Z adapted to rest against the shoulders V of the notches T.

The hook (Z is preferably of such length that when it is in engagement with the shoulders V, the free end of said hook may abut the wall of the barrel A.

In practice, whenever it is desired to unscrew the nose piece K from the barrel A, the loop may be pressed upwardly by the operator out of the notch T which it engages and the nose piece K may then be readily unscrewed from the barrel for the purpose of removing the working implement or substituting another working implement therefor. After such change has been effected,

piece K may again be screwed tightly on the barrel A and the loop V may then be pressed into engagement with the most suitably located notch T, that is, that notch which is so located that when the loop W is in engagement therewith, a certain tension spring X.

It will thus be seen that this coil spring X will serve the dual functions of automatically tightening the connection between the barrel A and the nose piece K and will also hold the nose piece K firmly against the effects of vibration in the tool. In this way the threads H and J of the barrel A and the nose piece K respectively will at all times be protected against such Wear as frequently occurs in devices of this character where the parts are merely screwed together without the provision of proper means for guarding against accidental unscrewing of the same.

I claim:

1. A locking device for the steel retainer of a fluid actuated percussive tool, comprising a front head, a collared steel in the front head, a nose piece threaded to the front head, said nose piece being provided with notches on its rearward surface and a spring retainer for locking the nose piece to the front head, said retainer being in the form of a wire coiled through at least one and one-quarter turns, one end of said wire retainer being secured to the front head and the other end of the retainer being formed with a loop adapted to engage the notches on the nose piece and projecting outwardly beyond the periphery of the nose piece in position to be grasped for releasing the device. V

2. A locking device for the steel retainer of a fluid actuated percussive tool, comprising a front head, a collared steel in the front head, a nose piece threaded to the front head, said nose piece being provided with notches on its rearward surface and a spring retainer for locking the nose piece to the front head, said retainer being in the form of a wire coiled through at least one and one-quarter turns, one end of said wire being bent radially inward to engage a notch in the front head the other end of the retainer being bent outwardly to form a loop, the end of the wire forming said loop being straight and pointed substantially toward the center of said coil, said loop projecting beyond the periphery of the nose piece in position to be grasped for releasing the device, and bent downwardly to facilitate cooperation with the notches in said nose piece.

In testimony whereof I have signed this specification.

FRED M. SLATER.

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