US892112A - Chain pipe-wrench. - Google Patents

Description

PATENTED JUNE 30, 1908.

G. AMBORN. CHAIN PIPE WRENCH.

APPLIOATION FILED MAY 6. 1907.

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UNITED STATES PATENT OFFIOE.

GEORGE AMBORN, OF NEW YORK, N. Y., ASSIGNOR TO J. H. WILLIAMS & 00., OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

CHAIN PIPE-WRENCH.

Specification of Letters Patent.

Patented June 30, 1908.

Application filed May 6, 1907. Serial No. 372,035.

' To all whom it may concern:

Be it known that I, GEORGE AMBoRN, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Chain Pipe-Wrenches, of which the following is a specification.

This invention relates to chain wrenches and similar devices and aims to provide certain improvements therein.

In the type of wrench to which my invention is particularly directed, a jaw or jaws are provided in connection with a chain which is pivoted or otherwise secured thereto, the wrench being provided with means for locking the free end of the chain after the latter has been passed around the pipe.

The present invention comprises certain improvements in such locking means.

In the drawings which illustrate one form of my invention, Figure 1 is an elevation of a wrench provided with my improved locking means, the wrench being shown as applied to a pipe; Fig. 2 is an elevation similar to Fig. 1 showing the parts in a dili'erent position; Fig. 3 is a top or plan view of the wrench; Fig. 4 is an elevation of the inner side of one of the jaws.

In the drawings I have shown my invention as applied to a construction of wrench having two laterally separated jaws A, A connected to a suitable handle B and between which the chain O is pivoted so that it may swing to either side of the wrench, so that either of the working faces a or a of the wrench may be brought into operation. As shown, the chain is pivoted to the jaws by a bolt 1) extending through the jaws and the end of the handle, the latter being slotted at c toreceive the first link or eye d of the chain. In wrenches of this construction locks are usually provided on each side af the wrench, and the chain is usually engaged with the lock which is on the opposite side to the pipe. In the form of lock heretofare commonly employed it has been found that the chain has been liable to slip out of engagement with the look under some of the conditions of use. This disengagement is especially apt to happen when the wrench is used on the under side of the pipe, so that the lock which is engaged by the chain is on the under side of the Wrench. Under these conditions the length of chain at the rear of the lock drops to a vertical osition and tends to throw the lock ing pintle out of engagement with the lock, especially when the wrench is given a return stroke to obtain a fresh grip on the pipe, during which time the strain upon the chain is relieved. According to the present invention I provide a lock which is adapted to pre vent such disengagement and to maintain the parts in the locked position in all of the ordinary conditions of use.

The construction of my improved lock is best shown in Fig. 4, which illustrates one side of the lock, this side being duplicated on the opposite jaw. As shown, the lock comprises an abutment D which is preferably formed on the forward part of the aw, such abutment being adapted to engage one of the pintles of the chain, and to bear all of the strains of use. At the rear of the abutment D I provide a forwardly turned hook shaped retaining member E, the forward end 6 of which is turned inwardly so as to provide a recess f to receive the pintle which is next adjacent to that engaged by the abutment D. In engaging the chain with the lock it is necessary to first bring the rear pintle in engage ment with the retaining member E, where upon the forward pintle automatically falls into place behind the abutment D. To 161- mit this movement the rear side of the a utment should extend at such an angle that the pintle may engage it by a lateral movement, or a swinging movement around the rear pintle as a center. I have found in practice that such abutment may be inclined forwardly to a certain extent and still hold the chain against all ofthe strains of use.

When the wrench is in use as illustrated in Fig. 1, it will be seen that the direct pull of the chain is borne by the abutment D. When the wrench is in use on the under side of the pipe as indicated in Fig. 2, the forward pintle on the return stroke of the wrench may move outwardly sulliciently to be disengaged from the abutment D, but under these circumstances, the rearward pintle is securely held in the recess f of the retaining member E. This not only prevents the complete es cape of the chain, but so holds the latter that on the next 0 erative stroke of the wrench the forward pintle automatically returns to its locked position behind the abutment. The unused length of chain back of the retaining member has no effect to tend to disengage the parts.

It will be understood that while I have illustrated my invention as applied to a wrench having a double jaw and a centrally pivoted chain, that it is applicable to other constructions of chain wrench and also to other devices of similar character. It will also be understood that instead of employing a chain having locking intles, I may substitute other forms of 100 ring means without departing from the invention. Other chains of a like character may also be used.

What I claim is 1. In a chain wrench or the like, a chain having locking faces, a locking means for the free end of the chain comprising an abutment adapted to be engaged by such locking faces, the rear side of said abutment extending at an angle sufficient to hold said chain in use, but permitting the free engagement of the chain therewith by a lateral movement of the chain, and means independent of said abutment for preventing disengagement of the free end thereof when the chain is on the under side of the wrench and released from said abutment.

2. In a chain wrench or the like, a chain having locking faces, a locking means for the free end of the chain comprising an abutment adapted to be engaged by such locking faces, the rear side of said abutment extending at an angle suflicient to hold said chain in use, but permitting the free engagement of the chain therewith by a lateral movement of the chain, and means for holding the chain independently of such abutment, such means comprising a hook-shaped retaining member spaced apart from said abutment sufficiently to engage the succeeding locking face of the chain, said hook shaped member being adapted to hold the chain when on the under side of the wrench and released from said abutment.

3. In a chain wrench or the like, a chain having locking faces, a locking means for the free end of the chain comprising an abutment adapted to be engaged by such locking faces, the rear side of said abutment extending at an angle sufi icient to hold said chain in 1 4. In a chain wrench or the like, a chain having locking faces, a locking means for the free end of the chain comprising an abutment adapted to be engaged by such locking faces, the rear side of said abutment extending at an angle suflicient to hold said chain in use, but permitting the free engagement of the chain therewith by a lateral movement of the chain, and means for holding the chain independently of such abutment, such means comprising a forwardly projecting hookshaped member spaced apart from said abutment sufficiently to engage the succeeding locking face of the chain.

5. In a chain wrench or the like having its working face formed in two parts with an intervening space between them adapted to receive a chain, a chain having locking faces, a locking means for the free end of the chain, such locking means lying on the opposite side to said working face whereby the chain is locked on the side opposite to the work, said locking means comprising a forwardly projecting hook-shaped member and means for holding said chain in engagement with such member when the chain is under a stress in a forward direction.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

GEORGE AMBORN. WVitnesses:

EUGENE V. MYERS, THEODORE T. SNELL.

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