US826939A - Chain wrench. - Google Patents

Description

No. 826,939. PATENTED JULY 24:, 1906.

C'. I. HULTGRBN. Y CHAIN WRENCH.

APPLICATION FILED IBB. 23, 1906.

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UNITED STATES PATENT OFFICE.

:'Speciication `of LettersPatent.

, Application filed-February 23,1906. Serial No. 302.497-

flo all whom ffm/ahy concern:

Be it known that I, CHARLES HULT- l GREN, a citizen ofl theUnited States, residing .atChicago, inathe county of Cook and'State ,ofIllinois, havei-nventedanew and useful Improvement in ChainWrenches, ofwhich l therfolhlowing isa specification.

:being seated; ini-position on a `similar .view 4Showing -the .wrench after. the slack: has Fig.. 3, a broken plan; view of \.wrench; fFig. 4, asimilar-view showing the My invention relates primarily to an improvement on-the subject-matter of Patent No. 733,648, .granted tome July 14, 1903, for chaintongs,l though my present improvementsvare not necessarily limited' to use with theparticular construction for ywhich that Apatent-was granted.

1 One .of my objects isV to provide -a construc- 4tion Awhereby `the lslack ofthe chain/in adjusting :the wrench Von the `article to `.be `gripped y,preparatory fto i operating `the tool shall beftaken upitothefullest possibleA extent, thereby to adaptv the. jaws toengage the article between their lends.

Another object 1 is i to :provide a construc- .tion in .which the' free endof the chain may be :readily disconnected fromy the .-wrench.

.'My. invention is illustrated in the accomfpanyingdra-Win s, in which` `Figure 1 isfa` roken view, in side elevation',representi=ngimy improved .wrench as pipe preparaslack Fig. 2, a position of the been taken up g the head of the tory tol the. taking up of the free end of. the chain fastened on the head of the.wrench;.Fig.i5, a side view of one of the j aw-equipped head-forming members, .showing a portion of the chain in dotted lines; and Fig. 6, a section taken: throughthe head and handle at the line 6 on Fig, 5 and viewed in the direction of the arrow.

A is the operating-handle, provided at one end with a head B, preferably formed of two jaw-equipped plates or members C C, secured to the end of the handle, as by bolts l) b, each member C being provided at its outer end with an arc-shaped serrated jaw C. The serrated surfaces of the jaws as represented are beveled to provide a channel C2 of V shape in cross-section to enable the jaws to 1 pipe D, whilethe chain is being adjusted about it.

E is a `chain permanently secured atl one of its ends tothefhead B beyondthehollowed `seat 0c andbetween themenibers'C by. apin e passing through an end= link, the other orfree gripped, Ysuch as a .end of the chain `being adapted-to @be re- -leasably heldin place on. the head, as' hereiny after described.

recessed, as shown at 2, andftheupper-forward surfaces of the members C are grooved, as shown at Q/,and terminateon the-front surfaces of the ears in cam-guides C2,.adjacent to the recesses.

To apply the wrenchto an article'tobe gripped, such as a pipeD, thehead-B is -applied at its concave seat upon the pipe and the free end of the chainis adjusted about the pipe and over the outer end ofthe head,

i the chain being separably secured in place on the head by inserting the proper link into the recesses Assuming the wrench to be applied to the pipe D, as shown,the handle is then raised to take up the slack inthe chain and to bring the serrated jaws Cy into engagement with the pipe, as shown in Fig. 2. To release=the wrench, the'handle isllowered, thereby producing slack in the chain and permitting the link confined in the recesses f to be withdrawn lon itudinally therefrom in the direction toward the rear end of the jaws," the cams C2 serving to raise the coniined link and carry it out of the recesses by pulling upon the end of the chain.

It will be seen that by providing the under surface of the head with a concave seating-surface with the chain depending from the eXtreme rear end of the latter the amount of slack which must be taken up in clamping the wrench is much less and shorter grip is attainable than in those devices in which no such seat is provided and in which the chain is passed backwardly in encircling the pipe with it. Y It is also manifest that the pro- IOO IIO

Vision of a cam-surface forward of the link-` confining recesses f serves to facilitate the rellasing of the free end of the chain from the ead. l

A further useful function of the grooves y is to guide the free end of the chain in adjust- Iing it upon the head to cause the link adj acent to the recesses to be automatically moved into osition opposite thereto, thus to facilitate t e introduction of the link into the recesses.

By providing a recessin the nose of the` head for receiving the chain the depending portions of the latter after the chain has been adjusted about the pipe and on the head are approximately parallel with each other, thereby, in conjunction with the curved adapted to encircle an article to be gripped and to coperate with said jaw in the gripping operation, said wrench being provided with a concave seat on its under side and said chain being fastened at the rear end of said seat.

2. A chain wrench comprising, in combiv nation, an operating-handle, a head on said handle having a recess in its outer end and v provided with a jaw, and a chain secured at one end on said head and adapted to encircle an article to be gripped and to cooperate with said jaw in the gripping operation, the under side of said head being provided with a concave seat intermediate said jaw and the point v of attachmentof said chain to the head.

3. A chain wrench comprising, in combination, an operatmghandle, a head on one end of the handle having a recess in its outer end and provided with a serrated jaw having a serrated channel in its clamping-surface, and a chain secured to said head and adapted to encircle an article to bev gripped and to cooperate with said jaw in the gripping operation, said head being provided on its under surface intermediate said jaw and the point of attachment of the chain to the head7 with a concave seat.

4. A chain wrench com rising, in combination, an operating-hand e, a head on said handle having a recess in its outer end and provided with a jaw, a chain secured at one endon said head, a recess in said head adapted to receive and releasably hold therein the free end of the chain, and a camuide on said head adjacent to said recess an adapted to release the chain, for the purpose set forth.

5. A chain wrench comprising, in combination, an operating-handle, a head on said handle having a recess on its outer end and comprising a pair of jaw-equipped members provided on their upper portions with ears having link-receiving recesses in their rear ends, the upper forward surfaces of said members being grooved and provided with cam-guides adjacent to said recesses, and a chain secured at one end on said head and having the links at its free end adapted to enter and be releasably held in said recesses, saidguides being adapted to be engaged by the chain, for the purpose set forth.

6. A chain wrench comprising, in combination, an operating-handle, a head on said handle having a recess in its outer end and comprising a pair of j aw-equipped members, separated from each other along their upper portions to form between them a channel and provided on their upper portions with ears containing recesses inthe rear ends, the upper forward surfaces of said members being grooved and each terminating in a camguide adjacent to said recesses, and a chain secured at one end to the head and having the links of its free end adapted to be inserted into said channel and grooves and into said recesses, for the purpose set forth.

CHARLES F. HULTGREN. In presence of- J. H. LANDES, G. A. OHRITTON.

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