US1169763A - Impact-tool head. - Google Patents

Description

W. J. BERNETT'. IMPACT TOOL HEAD.

APPLICATION FILED SEPT-'18. 1913.

Patented Feb. 1, 1916.

IN VENTOI? THE COLUMBIA PLmyoGnAm-l co., WASHINGTON, n. c.

WILLIS J. BERNETT, 01E KANSA$ CITY, MISSOURI, ASSIGNOR T WILLIAM B. THAYER, OF KANSAS CITY, E'IISSOUHI.

IMPACT-TOOL nnan.

Application filed September 18, 1913.

T0 aZZ whom it may concern Be it known that l, /ViLLrs J. Barnum, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful improvements in Impactlool Heads; and I do declare the following to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to an impact tool head, and more particularly to a mechanism for actuating a rock drill, riveting hammer, or other tool, the function of which is to strike against the object upon which it is being used; the principal object of the invention being to provide a simple mechanical mechanism for imparting the impact blow to the tool. In accomplishing this object 1 have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, vherein:

Figure l is a perspective view of animpact tool head constructed accordingto my invention, and shown equipped with an ordinary rock drill and connected with a. flexible shaft through which power is transmitted to the working parts. Fig. 11 is a side view of the tool with the drive shaft cap removed to illustrate the cam mechanism for imparting reciprocatory motion to the impact mechanism. Fig. H1 is a central longitudinal section of the tool head.

Referring more in detail to the parts 1 designates a housing forcontaining the working parts of the device, and preferably comprising a cylinder having cap flanges 2-3 at its opposite ends and having an enlarged port casing 4 inclosing the laterally opening port 5. Threaded into the tool end of the cylinder is a head 6 of a nose 7 having a central channel 8 preferably provided with an end socket 9, and threaded into the opposite end of the cylinder is a head 11 having a reduced, outwardly extending neck 12, both the head and neck being provided with a central channel 13.

ll ixed on the neck 12 is a housing 1 1, having an end cap 15 which is adapted for closing the housing in order that the latter may Specification of Letters Patent.

Patented Feb, 11-, 191%.

Serial no. 780,431.

be used as a handle for the tool head; the housing being preferably rigidly secured on the neck 12 by means of screws 16.

Slidably mounted in the chanels 8 and 13, in the head members of the respective ends of the cylinder 1, is a shaft 18, the outer end of which terminates in the squared socket 9, while the inner end is projected into the housing 1% and carries washers 19 and bolts 20, whereby the outward travel of the shaft is limited, and whereby such limit may be varied when required.

Fixed on the shaft 18, within the housing, is a stop 22, and surrounding the shaft and bearing against the stop and the inner face of the head 11 is a coil spring 23, whereby the shaft is normally yieldingly tensioned to its outer position. i

Revolubly mounted on the shaft, at the outer side of the stop 22, is a collar hav' ing a plane outer face 26 and cupped inner face 27 inclosing a ball race for confining the anti-friction members 28 which bear against the shaft and space the collartherefrom, so that the collar may revolve freely on the shaft.

Threaded into the port casing a is a cap 30, having a central aperture 31, and having a wrench head 32 on its outer face, whereby it may be tightened or loosened from its seat in said casing.

Revolubly mounted in the central aperture 81 of the port cap is a shaft 84, having collars 35 fixed thereon and adapted for con lining same in the cap 30, so as to obviate longitudinal movement without interfering with its rotation. Also fixed on the outer end of the shaft 34 is a head 36 adapted for connection with a flexible shaft, or other driving means, and fixed on the inner end of the shaft is a cam 37 which is adapted for contact with the outer face of the collar 26 on the reciprocatory shaft 18 once during each revolution of the shaft 34, in order to force the collar and the reciprocatory shaft back against the tension of the spring 23, and which is adapted for relieving the collar and shaft to the tension of the spring after the contact therewith is broken, so that the shaft is reciprocated rearwardly by positive driving action from the cam, and forwardly under the spring tension.

38 designates a tool having a squared end 39 adapted to seat in the socket 9 and for engagement by the outer end of the reciproshown.

catory shaft in order to drive the tool and cause same to impact against the object upon which it is being used; the present drawings illustrating the tool as an ordinary rock drill, although it is quite apparent that any suitable tool may be used in place of the one In using the device, presuming the parts to be constructed and assembledas described, and the driving shaft 34 connected with a source of power and a suitable tool located in the socket provided therefor, when the power is on, the shaft 34 is revolved and the cam 37 brought into contactwith the collar 25, so that the collar and reciprocatory shaft are moved backwardly against the tension of the spring 28;there being sufiicient room in the housing to permit such reciprocation, and the channel in the outer head being of sufficient length to prevent the escape of the shaft 18 therefrom. After the cam has moved the collar and shaft back against the spring, further rotation causes the cam to leave its contact with the collar, so that the collar and shaft are moved forwardly by the spring; the outer end of the shaft stnlnng agamst the inner end of the tool to produce a blow oi the tool against the matenal upon which 1t is working. it 1s apparent that when the shaft 34.- is revolved rapidly, the reciprocation of the shaft 18 will also be rapid, and that the working blows will follow each other in rapid sequences.

7 Copies 01 this patent may be obtained for on the shaft and thereby obviate wearing of its outer face by contact with the cam, and that if so desired the socket 9 maybe cylindrical in order that the tool may be revolved therein while it is in operation.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters-Patent, is

An impact tool head comprising a hollow 1 body having channeled heads at opposite ends, one of said heads having a tool socket communicating with its channel and the other head comprising an outwardly directed neck, a housing fixed on said neck, a shaft adapted for reciprocatory travel in the head channels and having one end projected into said socket and the other end into said housing, locking means on said shaft within the housing, a stop on said shaft within the body, a spring bearing against said stop and adjacent the head, a collar loosely mounted on said shaft and adapted for contacting the stop, a cap mounted on said body and having a channel opening into the interior thereof,

five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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