US2446212A - Pipe wrench having a fixed jaw and a cooperating reciprocating rotary jaw - Google Patents

Description

INVENTOR Marion H. Clark ATTORNEYS M. A. CLARK PIPE WRENCH HAVING A FIXED JAW AND A Filed June 6, 1945 COOPERATING RECIPROCA'I'ING ROTARY JAW Aug. 3, 1948.

Patented Aug. 3 1943 ence wetsetissvme A min; J'Aw Aivbln ,COOPERATING. .RECIPROQATIN ROTARY MariljnALClarh, infla e Application runes, 1945, Se n No. 597,797

This invention is directed to, ject to provide, an improved pipe wrench.

Another object of the present invention is to provide a pipe wrench which is easily and quickly manually adjustable for initial, engagement with remiss. (Cl. 51-1-96),

and is an obdifferent sizes of pipe, the wrench, when. engaged with a pipe, thereafter being self -adjusting to the latter.

A further object of the invention is to provide a pipe wrench which includes a fixed, toothed jaw and a rotary, toothed jaw mounted in spaced, but

cooperating relation to the fixed jaw; the rotary jaw being movable relative to the fixed jaw and spring urged toward the latter. i C

An additional object of this invention is to incorporate, in a pipe wrench as in the preced ing paragraph, means to mechanically and force fully advance the toothed rotary jaw toward the toothed, fixed jaw upon relative rotation of said rotary jaw resultant from movement of the wrench body about a pipe and biting of the toothed rotary jaw into said pipe. In this manner an effective, positive, and non-slipping engagement between the wrench and a pipe is accomplished.

It is also 'an object to provide a pipe wrench, as above, wherein the mechanical advancing means for the toothed rotary jaw, comprises a novel rack and pinion arrangement between said jaw and the body of the wrench.

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 are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of the wrench in use.

Figure 2 is a fragmentary side elevation, partly broken away, illustrating the adjacent rack and pinion unit.

Figure 3 is a fragmentary elevation as viewed from the left of Fi 2.

Figure 4 is a cross section on line 4-4 of Figure 1.

Referring now more particularly to the characters of reference on the drawings the wrench comprises a rigid, elongated body I formed at its rear end with a diagonal hand grip 2; said body including spaced apart side plates 3 connected together by suitable means, including cross pins 4.

i 2 1 Atthe forwardiend the body: is. formed with a laterally projecting fixed-jaw 5 which faces rearwardly and includes inwardly facing teeth. 6; this jaw being an initiallylsseparate member secured between lateral-extensionsof the side plates 3 as ShOWn. i-

r A circular, rotary jaw l is disposed rearwardly of the fixed jaw 5m cooperating relation to the latter; said rotary jaw being disposed in, part inthe channel between the side plates 3,..and movable to and from said fixed jaw-3. The rotary jaw is rtoothedras at 9, with the teeth on the Such rotary jaw 1 is mounted and actuated as follows:

The rotary jaw 1 is formed with a hub I0 which includes, at opposite ends, laterally outwardly extending pinions II which ride on top of and in mesh with corresponding racks l2 on the adjacent edges of the side plates 3. Escape of the pinions II from the racks I2 is prevented by means of overhanging flanges l3 formed on end plates l4 secured to the sides of the body I outwardly of said pinions.

Inwardly of the pinions I I the hub is engaged, on opposite sides of the rotary law I, by tumably mounted rings l5 which are formed on the forward ends of the legs l6 of a rearwardly extending yoke I1; said yoke being slidably arranged in connection with the body I by means of a hold-down saddle I8. At its rear end the yoke I1 is formed with a laterally projecting trigger H! which extends in substantially the same direction as the diagonal hand grip 2 but ahead of the latter. A tension spring 20 is connected between the rear end of the yoke and the holdbeing, formed in opposition down saddle l8, and such spring tends to urge the yoke, and consequently the rotary jaw 1, in a direction toward the fixed jaw 5.

In use of the above described wrench, the grip is hand engaged and the trigger then pulledrear- 'wardly by one finger. When the trigger is pulled rearwardly it causes corresponding movement of the yoke l1 and rotary jaw I, separating the latter from the fixed jaw 5 for entry of the pipe clockwise direction. With such rotation of the jaw 1 the assembly of racks and pinions II and i2 urges said jaw in the direction of the fixed jaw, whereby the pipe is positively and effectively clamped therebetween. In other words, the rotation of the turning movement of the body I about the pWQl'k in a-clockwisedi-rection is converted by the rack and pinion assembly into approaching movement of the rotary jaw 1 toward the fixed jaw 5.

'Io release the wrench from the work it is only necessary that the trigger 19 be retracted.

From the foregoing description it wlll'be readily seen that there has been produced such a device as substantially fulfills the objects of the invention as set forth herein. 1

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 donot form a departure from the spirit of theinvention, as defined by the appended claims.l l t Having thus described theinvention the following is claimed as new and useful and upon which Letters Patent is desired: 1. A pipe wrench'comprising an elongated body includingspaced apart side plates, a fixed Jaw projecting laterally from the body, gear racks formed along the outer edges of the side plates inspaced relation tosaid fixed jaw, a rotary jaw including a hub, spaced pinions on the hub engaging the racks, plates fixed to the side plates of the body and enclosing the hub, inturned flanges on the outer edges of the fixed plates enclosing the pinions to hold them in mesh with the racks, and manually operable means to move the hub and rotary jaw back and forth between the fixed plates while allowing rotation of such hub and rotary jaw.

, 2. Astructure as in claim 1 in which the last named means includes a ring surrounding the hub, and a pull element fixed to the ring and mounted for reciprocating movement relative to the elongated body.

3. A structure as in claim 2 including a fixed guide on the body which supports the pull element and through which the latter reciprocates.

4. A structure as in claim 3 including a trigger onthe free end of the pull element for operating the same in one direction and a spring interposed between the free end of the element and the guide for pulling the element in the opposite direction. V

MARION A. CLAREL;

REFERENCES CITED The following references are of recordin the

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