US367786A - Peters - Google Patents

Description

(Model J v E. 0. CARVIN PIPE WRENCH. No. 367,786. Patented Aug. 9,1887.

WITNESSES INVENTOR WC/QL Z $0M M \BY 2644mm 2 ATTORNEYS.

UNITED STATES PATENT OFFICE.

" EDWARD O. OARVIN, OF CORVALLIS, OREGON.

PIPE-WRENCH. i

SPECIFICATION forming part of Letters Patent No. 367,786, dated August 9, 1887.

7 Application filed October 5, 1886. Renewed July 8, 1887. Serial No. 243,762. (Modeh) T0 at whom it may concern.-

Be it known that I, EDWARD O. CARVIN, of Corvallis, in the county of Benton and State of Oregon, have invented a new and useful Improvement in Pipe-Tongs, of which the followingis a full, clear, and exact description.

My invention relates to pipe-tongs; and it consistsin a wrench having a shank provided with a detachable concave jaw, and a co-operative jaw whose face is also concaved and pivotedin a slot in said shank, the relative position of the jaws to each other being such that as soon as the operator closes down upon the pipe or rod,through thcmedium ofa springactuated lever attached to the shank and united to the pivoted jaw by means of a connectingrod, the wrench tightens in proportion to the force applied, as will he hereinafter fully described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

I Figure 1 is a side elevation of my pipetongs, and Fig. 2 is a view of the same turned one-quarter around.

A is a shank provided at one end with a dovetailed slot, a, cut to receive the detachable jaw B, whose toothed engaging-surface is coneaved, and at the other with a rounded surface, 0, to facilitate handliugf The detachable jaw Bis h'eld imposition by means of a screw, b, passing through the shank A and engaging its underside.

Thelever D,pivoted by arms (I d to the shank A near its rounded surface, has riveted to its under side, in close proximity to its disengaged end, a spring, 0. The free end of this spring 6 engages and bears upon the shank A, serving to keep the lever D operation.

An extension, E, formed upon the outer surface of the lever D, over the space between its pivotal armsd d, is united by means of a connecting-rod, R, to the jaw S, pivoted in a slot, W, in the shank A.

extended when not in In my tongs, by the use of the dovetail slot 0 and fastening-screw b, I am enabled to use different-size jaws therein, making the tongs adjustable to different sizes of pipe, and by having the jaws concave I gain agreat amount of bearing-surface and render the tongs less liable to break or otherwise injure the pipe.

The spring 0, in its attachment to the lever 5 D and bearing upon the handle O, causes, thronghlthe medium of the extension E and connecting-rod R, thepivoted jaw S to remain open when not in operation. Thus the wrench may at all ti mes be taken up for use, ready to grasp any rod or pipe within the compass of its adjustment.

In operation the lever D becomes a handle, together with the rounded surface 0 of the shank A, as in clinching the pipe thelever D, pivoted by the arms (1 (l to the shank A, is drawn closely into the rounded surface 0 of said shank A, flattening the spring 0 thereto, and is held in this position when in use. This movement of the pivoted lever D causes the connecting-rod It, through the extension E, to 1 draw down the pivoted jaw S into cooperation with thejaw B, dovetailed upon the shank A, to clamp and hold the pipe firmly.

Having thus fully described inyinvention, I claim as new and desire to secure by Letters Patent- The herein-described 'iipe-wrenel'i, consisting of the slotted shank A, provided with the stationary detachable jaw B, the movable jaw S, pivoted in the slot of theshank, with its end projecting through the said slot, the lever D,

pivoted to the shank and provided with the extension E, the spring e, secured to the lever and engaging the shank, and the rod Bi, con- 'necting the extension of-the lever with the end of the movable jaw, as specified.

EDWARD O. GARVIN.

Witnesses:

E. lVIARPLE, J. W. RAYBURN.

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