US1544807A - Pipe wrench - Google Patents

Description

July 7,1925. 1,544,807

W. L. CHILDS PIPE WRENCH FileiSept 6 1921 IRE v F52 W- L H INVENTOR.

BY mam ATTORNEY.

Patented July 7, 1925.

PATENTfOFFICE.

UNITED} STATES WILLIAM L. camps, or nousromrnxes, assrenon 'ro mrenns roor. COMPANY, or

- nous'romrnxas, A CORPORATION or TEXAS.

PIPE WRENCH.

Application filed September 6, 1921. Serial No. 498,664. 1

To all/whom it may concern:

Be it known that LNVILLIAM L. CHILDS, a citizen of the United States,residing at Houston, Harris County, Texas, have invented a certain new and useful Improvement in Pipe l/Vrenches, of which thefol- .vide a pipe lowing is a full, clear, and exact description, such as will enable others skilled in the art to which it appertainsto make and use the same.

My invention relates to an improvement in pipe wrenches, and more particularly to that type of wrench used in screwing and unscrewing the 'joints of drill stem or casing in-the drilling of deep wells.

The object of my invention is to provlde a wrench of this character which may be coupled .on to the pipe, or released therefrom with a minimum amount of manipulation of the gripping jaws.

1 Another object of my invention is to prowrench which may be secured to the coupling which is to be unscrewed without the necessity of operating releasing pins or bolts and in which the locking of the jaws about the pipe is accomplished by i the swinging of a latch conveniently arranged.

Another object is to provide a wrench having a powerful gripping action upon the pipe being handled. ther objects and advantages willmore clearly appear in the course of the more detailed description which follows;

Referring to the drawings, wherein like parts are designated by like numerals of reference in the several views, Fig. 1 'is a top plan view of a wrench constructed in accordance with my invention, shown as coupled about a pipe, said pipe being shown in transverse section; Fig, 2 is a side elevation of said wrench taken from a position at right angles to that shown in Fig. 1, the upper part being in section on the broken line 22 of Fig. 1. Fig. 3 is a broken detail, partly in section, showing my improved latch and Fig. 4 is a transverse section on the line 4.4. of Fig. 3.

The handle 5 of my wrench is preferably an elongated bar, nearly square in crosssection, and having an eye 6 on the outer or rear end to receive a hook or cable by means of which it may be operated. Adjacent the opposite or forward end is an upstanding eyelet 7 furnishing a supporting attachment.

The forward end of the handle 5 is recessed -on one side at 8 toprovide space for the movement of one of the jaws and the other side is formed into a shoulder 9 to limit the movement of the handle in one direction relative to the jaws. To the central forward end of the handle is secured. a segmental jaw 10 pivoted upon a pin 11. A

f similar jaw. 12 ispivotedat 13 to the outer end of the jaw 10. As shown in Figs. 1 and 2, the pin or pivoti13 is provided with a bushing 14 and at one end of the pin is arranged. a spiral spring 15, the ends of which are extended in opposite directions .along the. sides of the jaws 10 and 12 and are held in contact with stopmembers 16 and 17 on the said jaws, the resiliency of the 'spring, acting to force the ends ofthe spring against the stop members thus tending to throw the jaws into open position.

One of the jaws has a stop pin 18 thereon to limit the opening movement of the jaws relative to eachother. Thev jaw 12 is pro-.

vided with a handle 30 by means of which it may be manipulated. V p

The inner end 20 of the jaw 12 is somewhat enlarged and provided withan opening therethrough to receive a pin 19. The end 20 is forked as shown in Fig. 2 to provide a space to receive the hooked end 21 of a link 22 which forms a latch to secure the jaw relative to the handle, -The latch 22 is pivoted at its other end at 23 to the handle 5, ma point about the axial centerthereof and spaced behind the jaw lO. The outer end of the latch 22 is provided with a handle member 24 by means of which the latch may be manipulated. A spiral spring 25 is connected tothe outer end of the handle 24: and also to ahook 26 on the wrench handle 5. a This spring is under tension and acts normally to draw the latch into open position.

V The pivoted end of the latch 22 is forked as shown at 27 to receive the end of the handle 5 of the wrench/ Between the forked end 27 and the reduced end of the handle, shown at 28, I may provide a friction washer 29. Such a washer is shown in Fig. 4, the purpose thereof being to provide a friction joint so that when the latch has been thrown into a certain position, it will tend to remain so. When this joint is used it is contemplated that the spring 25 will be dispensed with.

The operation of my wrench is now obvio'us. The jaws are swung about the pipe as shown in Fig. 1 by means of the handle 30 on the jaw 12, the latch 22 being caught about the pin 19 on the end of the said jaw and, when in this position, the tension of the spring 15 will tend to draw the jaws apart and thus hold them in contact with the hook of the latch. If the handle of the wrench is then swung in clockwise direction, as shown in Fig. 1, the action 'of the latch connection between the handle and the jaw 12 will be to draw the said 'jaw into clamping contact with the pipe. The end 20 will be drawn toward the handle, the recess 8 allowing space for this movement. A similar action takes place relative tothe other jaw, the pivot pin 11 on the end of the handle being drawn to the right so as to force the jaw 10 also against the pipe, the combined action being clamping one. 4 I prefer to secure on the inner faces of the clamping jaws 10 and 12, a lining 31 of soft metal, such as soft iron or brass, and on one or more of the jaws I contemplate fixing a tooth o'r teeth 32 having a sharpened -edge projecting inwardly from the jaw. Thus, when the aws are clamped together by the swinging of the handle 5, the soft metal and the. tooth 32 will act to grip the pipe firmly, so that it may be rotated.

When the pipe is to be released, the

swinging of the handle in the opposite direction will act to unlatch the latch 22 from the jaw 12 so that the jaw may be quickly swung open and the wrench removed from thepipe. The construction of the head "of the wrench and the particular arrangement of the latch 22, which serves as a quickly removable catch and also as a connecting link in my clamping device, is especially advantageous, in that a most efficient clamping action is thereby obtained and a'quick release may be secured at all times. The use of a soft metal lining for the jaws in com bination with the sharp tooth secures a grip upon the pipe which will not fail to hold. Having thus described my invention, the further objects and advantages of which will be apparent to one skilled in the alt, what I claim as new and desire to protect by Letters Patent is 1. In a. pipe wrench, a handle having a lateral recess atone end, a latch pivoted adjacent said recess, a hook on the outer end of said latch, a segmental pipe gripping jaw pivoted to said handle at a point spaced beyond the pivotal point of said latch, a second segmental jaw pivoted at the outer end of said first jaw, means tending to throw said jaws into open position, and means on the end of said second jaw to receive the hook 'on said latch.

2. In a pipe wrench, a handle, a segmental jaw pivoted at the forward end thereof, a second jaw pivoted at one end to said first named jaw and having an opening in its other end, a latch pivoted on said handle at a point spaced to the rear of the pivotal point of said first jaw, a hook on said latch adapted to be received in the opening of said second jaw, and means tending to throw said latch into open position.

3. In a pipe wrench, a handle, a segmental jaw pivoted on the forward end thereof, a hooked latch pivotedat a point spaced to the rear of said jaw, said handle having a lateral recess adjacent said latch,

a'second jaw pivoted at one end to said first named .j aw and having means to receive 's'aid latch at the other end and means "tending to throw said jaws into open position in the manner described. I

t 4:. In a pipe wrench, a handle, a curved jaw pivoted at one of its ends to. the forward end of said handle, a hooked latch pivoted at a point spac'e'd'to the rear of said jaw, a second jaw pivota-lly connected to said first named jaw, and having an opening to receive said latch, means to manipulate .said second jaw and means to manipulate said latch, said latch being.

adapted to be released on movement of said handle in one direction.

5. In a pipe wrench, ahandle, a segmental jaw pivoted at one of its ends to the forward end of 'said handle, a pivoting pin in its other end, a second jaw connected to said first named jaw by means of said pin, a spring on said pin bearing against said jaws tending to force them into open position and means to latch said second jaw to said handle at a point spaced behind the pivotal point of said first named jaw.

In testimony whereof, I hereunto afiix my signature this the 31 day of August A. D.

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