US2169064A

US2169064A - C clamp

Info

Publication number: US2169064A
Application number: US213713A
Authority: US
Inventors: John E Williams
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-06-14
Filing date: 1938-06-14
Publication date: 1939-08-08
Anticipated expiration: 1956-08-08

Description

g- 1939 x J. E. WILLIAMS 0 CLAMP Filed June 14, 19 38 INVENTOR -J. f]. William? as ATTORNEY Patented Aug. 8, 1939 UNITED STATES PATENT OFFICE.

Application June 14,

3 Claims.

This invention relates generally to a mechanical clamping device, and in particular the invention is directed to an improvement in that type of tool known as G clamps.

In present C clamps, the screw is threaded through one leg of the clamp yoke and carries a swivel, work engaging head on its inner end. While such head is intended to engage the work in non-turning relation, in many instances especially where the head is engaging on angular surface or the like--the head binds on the screw and as a result rotates therewith and crawls relative to the work. This prevents proper and ready clamping of separate members together. For example, metallic members which are to be welded together must be held in positive engagement, and such is difiicult to obtain with ordinary C clamps for the reason above set forth.

It is therefore the principal object of my invention to provide a C clamp wherein the adjustable work engaging rod or bar is non-rotatable and engages the work with a positive and vice-like action; there being no tendency for said work engaging rod to crawl or slip from the work.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

The figure of the drawing is a side elevation of the tool, partly in section.

Referring now more particularly to the characters of reference on the drawing, the tool comprises the usual C-shaped yoke l including substantially parallel legs 2 and 3; there being a flat, work engaging face 4 formed on the inner edge of leg 2 adjacent its outer end.

A rod 5 slidably projects through a bore 6 formed in the outer end of leg 3 at right angles to the leg axis and in the common plane of the yoke; the inner end portion of said rod providing a jaw opposed to face 4. Rod 5 is preferably circular in cross section, and is of a length so that when the inner end engages face 4, the outer end extends beyond leg 3.

Such outer end of the rod is formed with an integral but ofiset sleeve I which is threaded for the reception of a left-hand screw 8 disposed parallel to the rod and adjacent thereto, said screw being substantially the same length as the rod. The inner end portion of this screw 8 is reduced in diameter, as at 9, and projects through a bore II! in leg 3. An enlarged head is formed on the extremity of the portion 9 inwardly of leg 3 and such head prevents outward movement of the screw relative to the leg 3. A thrust washer I2 1938, Serial No. 213,713

surrounds portion 9 between the head H and leg 3. By reason of the above arrangement, screw 8 may freely rotate but cannot separate from or move longitudinally relative to the yoke.

The screw is cut with a left-hand thread so that with clockwise rotation thereof, by means of a sliding transverse handle I3 on the outer end of the screw, sleeve 1 will advance toward the yoke. With such advance, rod 5 likewise slides inward toward face 4 and without rotating. Thus,

work may be clamped between face 4 and rod 5 and the rod will not tend to crawl or slip therefrom. Round or irregularly shaped members can be clamped together with case. As the rod 5 is smooth, the clamp can be used by welders and any spots or particles of metal which may adhere can be quickly filed or ground off, and which cannot be done with ordinary C clamps, as the spots adhere in the threads.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

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

1. A G clamp comprising a yoke, a work engaging face on the inner edge of one leg of the yoke, a rod slidably projecting through the other leg for movement to and from the face and at substantially right angles thereto, and whose end adjacent said face forms a cooperating work engaging face, a handle actuated screw rotatably mounted on and projecting outwardly from said other leg of the yoke parallel to the rod, the screw being longitudinally immovable relative to the yoke, and means between the rod and screw to slide the former upon rotation of the latter.

2. A device as in claim 1, in which the screw is cut with left-hand thread, whereby when said screw is rotated clockwise, the rod will slide toward the work engaging face.

3. A C clamp comprising a yoke having fixed spaced legs, a work engaging rod slidably projecting through one leg at right angles to and adjacent the free end thereof, a screw projecting outwardly from said leg parallel to and adjacent the rod, means mounting the screw on said leg for rotative but not longitudinal movement and V a sleeve rigid with the rod at its outer end and having threaded engagement with the screw.

JOHN E. WILLIAMS.