US2163842A - Pipe wrench - Google Patents

Description

27 1939 L. KUHN PIPE WRENCH I Filed Aug. 1 1958 Inv tor K 2 e C Patented June 27, 1939 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to pipe wrenches, and has for the primary object the provision of an efiicient and inexpensive device of this character which will be sturdy in construction and capable of withstanding severe strain and is so constructed as to permit easy and quick application of the jaws thereof to a pipe or similar device and which will assure against slipping of the jaws on the pipe while in the act of rotating the pipe.

With these and other objects in view, the invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a side elevation illustrating a pipe wrench constructed in accordance with my invention.

Figure 2 is a fragmentary vertical sectional View illustrating the means of releasably securing the movable jaw in its various adjusted positions on the handle of the wrench.

Figure 3 is a View similar to Figure 2 illustrating a modification of the invention.

Figure 4 is a view similar to Figures 2 and 3 illustrating another modification of the invention.

Figure 5 is a transverse sectional view taken on line 5-5 of Figure 1.

Referring in detail to the drawing, the numeral 5 indicates a handle of a selected length and of stock capable of withstanding severe strain. Formed integrally with one end of the handle is a relatively fixed jaw 6 having a work-engaging serrated face 1. Associated with the handle 5 is a movable jaw 8 having a serrated workengaging face 9. The work engaging faces 1 and 9 are arranged at diverging relation with respect to each other.

A yoke or strap l forms an integral part of the movable jaw 8 and is slidably mounted on the handle and has detachably secured thereto a casing ll. Bolts I2 are employed for removably securing the casing on the strap or yoke Ill. The handle 5 has formed thereon holding teeth I3 over which the yoke or strap slides and the latter is provided with an opening I 4 through which operates a pivotally mounted dog l5. The dog I5 is pivotally mounted in the casing II and is spring influenced to engage with the teeth l3 for retaining the jaw 8 in various adjusted positions with respect to the jaw 6. The spring which acts on the dog is of the leaf type, as shown at l6, and is suitably mounted on the casing. A finger piece I! is slidably mounted in the casing and engages with the dog whereby the latter may be readily moved out of engagement with the teeth l3 to permit adjustment of the jaw 8 towards and from the jaw 6.

If desired, a pair of dogs l8 may be pivotally mounted in the casing to engage with the teeth l3 and are similarly constructed to the dog I 5 and are spring influenced. Engageable with the dogs I8 is a plate l9 carrying a finger piece 20 slidably mounted in the casing whereby both of said dogs may be simultaneously disengaged from the teeth l3. In large size wrenches it may be desirable to employ three or more dogs for releasably securing the movable jaw in its adjusted position. Three of such dogs are indicated by the character 2| in Figure 4. The dogs 2| are spring influenced to engage with the teeth l3 and are engaged by a plate 22 carrying a finger piece 23 whereby all three dogs may be simultaneously disengaged from the teeth l3 when desiring to adjust the jaw 8 relative to the jaw 6.

A wrench of the character shown and described in detail may be easily and quickly adjusted to a pipe or like device by simply pressing on the finger piece to release the dogs from the teeth l3 so that both jaws [may be brought firmly into engagement with the pipe. As soon as the finger piece is released, the dogs are influenced in engagement with the teeth l3, consequently firmly holding the movable jaw in its adjusted position with respect to the relatively fixed jaw 6. Due to the diverging serrated faces of said jaws they will firmly grip a pipe when pressure is placed upon the handle. The casing being removable from the yoke or strap permits examination and repair of the dogs when necessary.

It is believed that the foregoing description, when taken in connection with the accompanying drawing, will fully set forth the construction and advantages of this invention to those skilled in the art to which such a device relates, so that further detailed description will not be necessary.

What I claim is:

. In a wrench of the character described, a handle having teeth and a fixed jaw, a slidable jaw for coaction with the fixed jaw, a yoke carried by the slidable jaw and slidably receiving the handle and having spaced openings to expose the teeth of the'handle covered by said yoke, a casing detachably mounted on the yoke to cover the openings, a series of dogs pivoted in the casing for movement through the openings to engage the teeth and each of substantially L-shape, leaf springs carried by the casing and bearing against the dogs to urge the latter in engagement with the teeth, a plunger slidable in the casing, and a plate carried by the plunger and engaging the dogs to permit the simultaneous disengagement of the dogs from the teeth by the manual actuation of the plunger.

LAWRENCE KUHN.

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