US542012A - dunham - Google Patents

Description

t e e h S N e e h S 2 M A H N U D L C. m. d o M o m PIPE WRENGH.

Patented July 2, 1895.

lllllu Pi INVENTOH W/TNESSES:

(No Model.) l 2 Sheets-Sheet 2.

C. L. DUNHAM.

PIPE WRENCH.

- mis/12,012. 4 Patented Ju1yz,1 af95.

W/TNESSES.' NVENTOH l ATTORNEY.

NiTnD STATES PATENT. OFFICE,

CHARLES L. DUNHAM, OF OENTREVIEW, OHIO, ASSIGNOR OF ONE-HALF TO COCHRAN C. STOVER, OF SAMEPLACE.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 542,012, dated July 2, 1895. Application filed April 19, 1895. Serial No. 546,438- (No model.)

To ctl whom, 'it may concern.'

Be it known that I, CHARLES L. DUNHAM, a citizen of the United States, residing at Centreview, in the county of Monroe and State of Ohio, have invented certain new and useful Improvements in Pipe Tongs or Wrenches; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to that class of tongs or wrenches w-hich are especially adapted for use upon pipes and similar` articles.

My invention consists in certain improvements upon the pipe-tongs embodied in the patent granted to W. Orumbie January 11,

In the construction of that class of pipetongs in which the block-die or changeable toothis secured upon the inner face of one of the jaws adjacent to the curved recess in which the pipe is secured, and is adapted to have its edge catch against the side of the pipe the block-die is liable to breakage and displacement when it is simply held in posif tion by a set-screw passing through the blockdie and into the jaw, all the strain being on the set-screw, so that with the heavy strainl usual in the use of"devices of this character the block dies or teeth thus secured are liable to break off. Furthermore, in this construction and arrangement the dies are not Well adapted to be successively reused after they are dulled. When the edges of the die or tooth are dulled, they could not be ground and practically used again` for the reason that, owing to the xed threaded set-screw construction, the nen-"edges would not comeinto proper position for operation.

The object of my invention is to provide an improved construction and arrangement in which the die will be effectively and securely retained in position, which will enable the grinding and reuse of the die several times, which Will obviate the disadvantages and breakage above set forth, and which Will be durable, convenient, eective, and thoroughly eiicient.

In the drawings, Figure l is a side View of a pipe-tongs embodying my improvements. Fig. 2 is a longitudinal sectional viewof the 'die removed.

same. Fig. 3 isa detail perspective View ot' the jaw carrying theblock die or tooth. Fig. e is a detail transverse sectional View taken through said jaw and the die. Fig. 5 is a detail longitudinal sectional view taken through said jaw and the die. Fig. 6 is a detail perspective view of the end of the jaw with the Fig. is a detail perspective View of the spring-actuated retaining-pin mechanism. Fig. 8 is a detail perspective view of the block die or tooth. Fig. 9 is a detail plan View of the jaw with the block-die and retaining-pin removed.

Referring to the drawings, A designates the operating-lever, to which is pivotally connected the jaw C, the latter beingpivoted at its outer end to the jaw B, having-a recess h in its inner end, which recessv is engaged by` the end projection g of the lever A. The jaws are provided in their opposite inner faces with curved or segmental recesses in which the pipe is adapted to be clasped, and the main construction of all the foregoing parts may be substantiallythe same as in the Orumbie patent. In the latter patent the block die or tooth D, Which is formed by a rectangular steel plate adapted to have all its edges successively used, was simply secured against the flatinner face of the jaw B by means of a single set-screw passing through the block-die into the said jaw.

In my invention the jaw B is provided at its inner face and near its rear end with inwardly-projecting side flanges BB, said iianges or ears being arranged at each side the at die-seat b adjacent to the curved or semicircular recess b. The flat die-seat b terminates at its rear end in a transverse shoulder b2. Projecting inwardly from the inwardly-projecting side fianges or ears B B', at the top thereof and transversely with relation to the jaw, are provided lugs or arms b3, said arms thus projecting over the die-seat b and being adapted to receive the block die or tooth D between the arms. and the die-seat, the under faces b4 of saidfarms being preferably formed flat aud smooth to correspond to the top face of the die.

In the jaw B, centrally with relation tothe die-seat b, is provided an opening or perforation b5 extending entirely through the jaw and of smaller diameter at its lower portion roo bs, thus providing an interior annular shoulder 29T. Within this opening b5 is set a springactuated cylindrical retaining-pin E, having its bottom end e normally projecting from the bottom of the opening b5 and its top end e projecting above the die-seat b, as shown. This retaining-pin is provided near its top end e with a circumferential annular fiange or enlargement e2, corresponding to they interior annular shoulder E7 of the opening b5 and accommodated in the larger upper part of said opening. The annular flange e2 pref-` erablycorresponds in diameter to the larger upper part of the opening b5. lgetween the shoulder 57 and the circumferential ange e2 is provided a coiled spring F upon the cylindrical pin E, which spring exerts its ten-- sion to retain the pin in normal position for securing the die-plate D in place.

The block die or tooth D is formed of a fiat steel plate and is adapted to rest' against the transverse shoulder b2, when it is secured in position upon the die-seat L and under the overhanging lugs or arms b3, by means of the spring-actuated retaining-pin E. In thel center of the die is provided a smooth opening or perforation d, corresponding tothe pro.- jecting top end e of the pin E and adapted to receive the same. This opening d may be slightly larger in diameter than the end e', if desired. The die is reversible, so that all its edges can be successively used, and by reason of this improved construction and ar'- rangement the edges of the die maybe ground and the die effectively reused a number of times without affecting its secure retention in position or its proper projection and operati-on against the side of the pipe when the latter is clasped in the curved orsegmental recesses of the j-aws.

The spring-actuated cylindrical retainingpin E and the actuating-spring F may be readily removed from the opening b5, in which they are normally housed, for purposes of sul)- stitution or repair, if desired.

The operation and advantages of my improve-ments will be readily understood by those skilled inthe art to which it appertains, the general operation of the tongs being` substantially the same as in the construction einbodied in the above-mentioned patent.

It is obvious that the projecting top. end of the retaining-pin Will securely hold the diein position, and by reason of the construction and arrangement herein described and illustra-ted breakage or displacement of the die is obviated and the strain is distributed and evenly met. The die or tooth is effectively and securely retained in operative position j and inclosed or braced by the projecting side flanges or ears B and the transverse shoulder b2, in conjunction with the retaining-pin and the projecting lugs or arms b3. To remove the die from its seat, it is only necessarry to pull down the spring-actuated retaining-pin E (by means of its projecting bottom end e) until the top end e is within the opening b5, when the die can be slipped out from between the side anges or ears B. The die may be as readily set into position, and when the pin E is released it is returned to normal position by the tension of the spring F.

The annular flange e2 of the spring-actuated pin E bears against the under face of the die D and serves to bind the latterin place under and against the overhanging lugs or arms b3 b3.

-Having -thus described my invention, l claim and desire to secure by' Letters Pat-- entl. A pipe tongs of the class d'escribed,having the jaw provided with the block-die or plate secured in position. by a spring-actuated retaining-pin seated in` the jaw and engaging the die, substantially as andfor tho purpose set forth.

2. A pipe tongsof the class described, having the jaw provided with projecting lugs or arms overltanging the, die-seat, the removable block-die or plate set in said. seat under the projecting lugs or arms and provided with the opening orperforation, and a spring-actuated retaining-pin seated in an opening in the jaw and projecting upwardly therefrom and having its top end engaging the opening in the die, substantially as and for the purpose set forth.

3. A pipe tongs of the class described, having the jaw provided with the inwardly-projecting flanges or ears at the sides of the dieseat,- said tlangesy or ears having the lugs or arms projecting over the die-seat, the blockdie or plate set, in its seat, between the projecting side flanges or ears and under the arms, or lugs thereon and having the opening or perforation, theretaining-pin seated in the opening or perforation in the jaw and projecting therefroml into engagement with the opening in the die, and the actuating spring housed inv the opening in the jaw, substantially as and for the purpose set forth.

4. A pipe tongs of the class described, having the jaw provided with the die-seat and with the projecting lugs or arms overhanging the die-seat, the jaw being provided at the die-seat with an opening or perforation having an interior annular shoulder, the block-die or plate adapted to be set in the die-seat under the overhauging lugs or arms and provided with the opening or perforation, the retainingpin seated inthe openingin the jaw and having its top end projecting therefrom and engaging the opening in the die,said pin being provided with a circumferential flange or shoulder, and a coiled-spring mounted up'on said retaining-pin, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES L. DUN HAM.

Vitnesses:

FRANK MARLOW, JEROME LITTLE.

IIO

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