US1662413A - Wrench - Google Patents

Description

March 13, 1928. 1,662,413

D. M. BRIGHT WRENCH Original Filed July 5, 1923 E INYE HTOR' D-MB QW Patented Mar. 13, 1928.

UNITED STA oar-lice.

warms.

Application filed July 5,1923, Serial Nd; 649',74=1. Renewed November 28 1927.

' the object to be rotated; and an object'of the invention is to provide a wrench whichhas a comparatively large range and which can be quickly (XClJIIStBCl to grip the object on which the chain applied and which is constructed such that the gripped chain will exert a uniform pressure on the periphery of the object gripped.

A further object is to construct the chain links such that they will not slip on the gripped object, and further such that the head of the handle or lever associated with the chain will positively catch the chain and have a considerable bearing thereon.

A further object is to construct the various parts such that they can be readily assembled and at a reasonable cost.

With the above more important objects in View the invention consists essentially in the arrangement and construction of parts hereinafter more particularly described and later pointed out in the appended claim,

reference being had to the accompanying drawing in which: a

Fig. 1 is a side view of the wrench and showing it gripping a pipe,

Fig. 2 is a top plan view of the wrench,

Fig. 3 is a perspective view of one of the links,

Fig. 4 is an enlarged detailed sectional view through the head of the lever and through the master links, and Fig. 5 is a face view of one of the split rings.

In the drawing like characters of reference indicate corresponding parts in the several figures.

The handle or lever 1 of the wrench is of suitable length and strength and is preferably of drop-forged steel and it is shaped to give a convenient hand grip. One end thereof is constructed to form a head 2, the head being provided with facial side openings 3 and 4, which contain centrally positioned axially alined pivot pins 5 and 6 which in the present instance are shown as integrally formed with the head. On the pins I mount pivotally similar right and left master links 7 and 8 which are held in place by split rings 9 and 10 which pass over the ends of the pins and spring into grooves 11 and 12 surrounding the outer ends of the pins. This connection'is a convenient one,

but obviously I would: notdesire to be rim .ited to such' an" arrangement, as any wellknown mechanical means could. be employed to retain the links; on the pins, Further,

while the pins have been shown as inte grally cast, a single pin or bolt passing throughthe-head could be substituted without departing from the spirit of the invention. i

It will be observed that the head is provided with shoulders 13* and" 14' which.- limit the swinging movement of the master links. To the freeend of the master 'links I connect pivotally: by' means ofawstelpin 1'5, a length of. chain 16', which is formed from a plurality of lengthwise extending staggered alternated rows of similar links 17 the links being connected together by steel pivot pins 17. The pin at the free end of the chain carries pivotally an end loop 18 of steel wire. The links of the chain are all formed in the manner best shown in Fig. 3, where it will be observed that the inner or grabbing edge of the link is constructed to pro,

vide a pair of spaced legs or foot pieces 19 andv 20, and the outer or opposite edgeof the link is fitted centrally with a comparatively deep cross groove or channel 21 which has the side walls thereof concentric to the link connecting pins and the base thereof semicircular.

When the wrench is in use the chain is passed around the object, such-as a pipe 22 to be gripped, and the free end of the chain carrying the loop 18 is passed between the master links, as best shown in Fig. 1. The loop 18 is provided for convenience in passing the end of the chain between the master links. a

Thehead of the lever is provided at the one side with a plurality of similar teeth 23 and at the other side with a single toothQ l. The said teeth are relatively arranged, as

shown best in Fig. 1, where it will. be observed that the teeth 23 are adapted in the swinging of the lever to enter the grooves or channels 21, it being here pointed out that when the chain links are assembled they. form continuous equi-spaced cross channels at the outer side of the chain. It will be obvious, in referring to Fig. 1, that if the lower end of the lever be swung to the left the teeth 23 will act to draw the chain tightly around the pipe or such like object and that 110 the foot pieces of the tightened chain will effectively grip the pipe, preventing slipping. The pressure is evenly distributed around the pipe so that there is no possibility of it being collapsed or damaged. Particular notice is to be taken of the fact that the teeth 23 are compartively long and that as each tooth comes into commission it has a bearing for its full length in the cross channel formed in the outer face of the chain. This materially increases the strength of the wrench and gives no possibility of slipping when the wrench being tightened up.

The wrench can be quickly released from the gripped object as the tooth 2i will enter a groove in the chain and quickly expel the end of the chain from between the master links.

The wrench can he made in several sizes, the smaller size having the chain of a length such that it will accommodate objects ranging up to, say, six inches in diameter. What I claim as my invention is:

A wrench comprising a handle having a circular or segmental head formed at one end thereof, master links pivoted at one end centrally to the opposite sides of the head, the peripheral portion of the head lying between the said links being provided with a series of teeth arranged concentric to the head. and a chain formed from a plnrality of lengthwise extending staggered pivotally connected alternated rows of similar links having one of the terminal rows of links pivotall attached to the free extremities of the master link. each link of said chain having the ends thereof semicircular and being provided on the inner sides with spaced gripping projections and at the outer sides with a cross channel, the side walls of which are curved continuous with and concentric with the ends of the link, the said cross channels of the assembled links being adapted to receive and make rolling contact with the teeth of the head.

Signed at Vinnipeg, this 18th day of April 1923.

DAVID MUSSEN BRIGHT.

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