US 2023832 A
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Description (OCR text may contain errors)
J. C. FISHER Dec. W, 1935.
WRENCH Filed May 26, 1934 Inventor JCTELV/fer Patented Dec. 10, 1935 UNITED STATES PATENT OFFICE 1 Claim.
This invention relates broadly to the class of tools and more particularly to a hand tool of the wrench type.
An object of the present invention is to provide a wrench especially designed for use in conjunction with set screws for tightening and loosening the same, and to this end to provide a wrench having an improved gripping surface whereby the wrench will not be liable to easily slip off of the set screw, will automatically apply itself to the set screw or nut by a slight movement of the wrench, and which will be found especially adapted for engaging and holding firmly a set screw which has become so worn that other and usual wrenches would fail to take a proper grip thereon.
The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawing wherein:
Figure l is an elevational view of the wrench with certain parts broken away and shown in section.
Figure 2 is an edge elevational view of the wrench with the head thereof shown in section.
Referring to the drawing by reference numerals it will be seen that the improved wrench comprises a handle 5 equipped at one end with a circular or disk like head 6.
The head 6 is provided in one face thereof with a socket l the wall of which adjacent the inner end of the socket slopes or inclines as at 8 toward the axial center of the socket and merges into the edges of an opening 9 provided in the face of the head opposite to the face through which the socket 1 opens. The opening 9 is of relatively smaller diameter than the diameter of the socket l as will be clear from a study of the drawing.
Embedded in the peripheral wall of the socket 5 I is a circular series of balls I0, and these balls are preferably formed of steel, and in the manufacture of the wrench the balls ID are welded into the head of the wrench. It will of course be understood that the balls may be of any size 10 desired. It will also be noted that the balls l0 are relatively spaced an equidistance apart around the head of the socket and provides, through the medium of the portions of the balls projecting inwardly of the socket beyond the face of the peripheral wall of the socket a gripping surface for engaging the work in a manner to readily adjust itself tothe work and provide for an efiicient gripping of the work by the socket to insure a positive action between the wrench and the work being operated upon.
Having thus described my invention, what I claim as new is:
A wrench including a head provided with a socket opening through one face thereof, and a centrally disposed aperture at the inner end of the socket opening through the opposite face of the head said aperture being smaller than the socket opening, and a circular series of relatively spaced steel balls having portions thereof embedded and immovably secured in the peripheral wall of the socket, the circular series of steel balls providing a gripping surface for the wrench.
JOE C. FISHER.