US2475041A - Percussive type wood chisel - Google Patents

Description

July 5, 1949. J, -r50 2,475,041

PBBOUSSIVE TYPE WOOD CHISEL Filed Feb. 25, 1946 IIIIII llllll/ l a p 4 v INVENTOR JOSEPH MMATTSON AT TORNEYS Patented July 5, 1949 UNITED J'SETATLE'S' pr ce.

2,475,04l PERCUSSIVE TYPEWOUD CHISEL Joseph MQMattson, Kenosha, Wis. Application February 25, 1946;Sefibllfio. 349,915 1 Claim. (Cl. 14524) My invention refers to hammer tools of the type wherein a weighted handle is reciprocated upon a stem to impart blows to a tool carried by the stem.

The object of my invention is to provide for strength and lightness in weight, a hollow stem having a bottom shouldered socket for receiving a removable tool and a chuck mechanism for strengthening the socket, whereby heavy blows upon the chuck mechanism will be absorbed and transmitted to a tool mounted in the socket.

The hammer tool is particularly adapted for special inter-changeable tools such as: Ripping chisel, wood chisel, center punch, star drill, leather punch, plumbers caulking iron (inside and outside), caulking tool for cracks, chipping chisel, nail set, ice pick, etc.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the novel construction, combination and arrangement of parts, substantially as hereinafter described, and more particularly defined by the appended claim, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claim.

In the accompanying drawings is illustrated one complete example of the physical embodiment of the present invention constructed according to the best mode so far devised for the practical application of the principles thereof.

In the drawings:

Fig. 1 represents a side elevation of a hammer tool embodying the features of my invention, with parts broken away and other parts in section to more clearly illustrate structural features; and

Fig. 2 is a side elevation of a center punch tool forming one of a series of such tools.

Referring by characters to the drawings, I represents a hollow stem of any desired length.

The lower receiving tool end of the stem is counterbored to form a socket terminating with a shoulder '2 adapted to receive the shank 3 of a removable tool, which tool, as shown in Fig. 1, is of the chisel type. The tool, intermediate its ends, is provided with a shoulder 4 from which the shank 3 extends.

The end portion of the stem is exteriorly threaded for the reception of an internally annular threaded sleeve 5 and said sleeve terminated, at its lower end, with an inturned flange 5, which flange abuts the end of the stem. Thus it will be noted, a chuck for the tool is developedwhich will eifectively reinforce the socket against hammer blows and prevent springing or bulging of the parts. Furthermore, in the event that the anvil sleeve is broken or marred in use, the same can be quickly renewed.

After the anvil sleeve is properly positioned, the same, together with the stem end, is transversely apertured and threaded for the reception of a thumb screw 6.

The shank 3 of the tool, is formed with an annular channel I above the shoulder 4 and in alignment with the thumb screw, whereby the end of said thumb screw, when positioned, will impinge against the bottom of the channel and thus hold a tool securely in place.

Furthermore, the thumb screw, in addition to holding the tool in the proper position, will also confine the sleeve, with reference to the stem, whereby jarring of the parts will prevent loosening of the screw threaded connection between said stem and anvil sleeve, it being understood that the shock of the blows upon the tool will be absorbed by the shoulder 4 of the same engaging the sleeve flange 5, and also the shoulder connection 2 between the end of the shank and stem.

To complete the tool, a hollow weighted handle I is reciprooatively mounted upon the stem and thereafter it is confined by a cap I" in threaded union with the upper end of said stem.

Fig. 2 simply illustrates one of the various tools that may be fitted into the chuck and while I have previously mentioned a number of such tools applicable to the machine, it is understood that they may be varied indefinitely, as, for example, it is possible to use :a tool of the fork variety for gardening purposes wherein it is desired to loosen up hard soil about plants.

I claim:

A hammer tool comprising a hollow stem open on one end and having a shoulder therein intermediate the ends of the stem and facing said open end, a portion of the stem adjacent the open end being externally threaded, a sleeve in threaded union with the threaded portion of the stem, the sleeve being provided on one end with an intumed flange engaging said one end of said stem and on the other end with an anvil surface, a percussive tool having a shank of reduced diameter to form a shoulder, said shank being removably positioned within the open end of the stem and with the shoulder of the shank engaging the sleeve flange and the free end of said shank engaging the stem shoulder, when the tool is in its operative position, said shank having an annular groove formed therein and intermediate the shoulder and the free end of the shank, a threaded aperture extending through the sleeve and stem and in alignment with the shank groove when the tool is in its operative position in the stem, a thumb screw in threaded union with the sleeve and stem aperture and engaging the bottom of the shank groove, whereby the three elements are held against relative rotation incidental to vibration, a cap secured to theupper end of the aforesaid stem, and a weighted handle reciprocatively mounted upon said stem between the cap and sleeve, the end of the handle nearest the sleeve being provided. witha striking surface to impinge said anvil surface whereby i to impart a hammer blow to the tool.

JOSEPH M. MATTSON.

REFERENCES CITED The following referenlces are of record in the file of this patent:

UNITED STATES PATENTS

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