US2069976A - Wrench - Google Patents

Description

Feb. 9, 1937. J. o, SEH N 2,069376 WRENCH Filed Feb. 18, 1955 Patented Feb. 9, 1937 UNITED STATES y} PATENT OFFICE.

6 Claims.

The invention relates to tongs to be employed in unscrewing the joints of rods such as sucker rods which are employed in pumping.

In reciprocating the plunger in deep well pumping the sucker rod which extends from the surface down to the plunger is made up, of sections coupled together at their ends. The coupling or joint has to be screwed up tightly in order to avoid unscrewing in use, and rod tongs of this type are employed for this purpose.

It is one of the objects of the invention to provide a wrench or tong which is adapted to engage the squared portion of the joint and exert a shock thereon for the purpose of screwing up or unscrewing. the joint.

It is a further object to provide a handle for the wrench which is formed to exert a shock upon the head of the wrench in such manner that the said shock will not be communicated strongly to the operating handle of the wrench.

It is a further object of the invention to provide a wrench with a handle pivoted thereto in combination with means to hold the head of the wrench in alignment with the handle when the wrench is being placed in operative position.

It is a further object to provide a forward end upon the handle which may be used to partially close the rod engaging socket in the head so as to better'retain the wrench in position when it is being applied to the pipe.

Referring to the drawing herein wherein a preferred embodiment of the invention is disclosed, Fig. l is a side elevation of the invention.

Fig. 2 is a sectional detail of the head of the wrench taken on the plane 22 of Fig. l.'

Fig. 3 is a broken section of the forward end of the handle.

Fig. 4 is a view of the wrench head with the handle attached thereto, said wrench being'in rod engaging position.

The invention is made up of a head I with a handle 2 secured pivotally thereto by means of a pivot pin 3.

The head I is provided with a forward hooked end 3 with a squared socket 4 therein to engage.

about the rod joint which is squared for engagement with the wrench. The head is extended beyond the socket and is recessed on opposite sides as shown at 5. This recessed portion is adapted to interfit with the handle which has a forked forward end 8, between the arms of which is provided a space 1 to receive the recessed portion 5 of the head. There is a thickened portion at 8 at the inner end of the recessed portion against which the handle 2' may engage as will be later described.

The outer end of the recess 5, has a rounded cam shape 9 also for engagement with the handle. The handle 2 is provided with openings Hi to receive the pivot pin 3 by means of which it is secured to the head. The forward end of the arms 6 of thehandle is rounded off at H to provide a cam surface to contact with the rounded shoulder 9 of the recess 5 on the head. It

will be seen that when the handle is in longitudinal alignment with the head, as seen in Fig. 1, the cam surface II will engage against the cam surface 9 of the head. In this position also the handle will contact with the shoulder provided by the thickened portion 8 of the head.

I'hehandle has thereon a spring. l2. secured detachably to the handle by set screws I3. The forward end of the spring is extended into contact with the outer inclined portion M of the head and tends to hold the head in position with the cam surface of the head and handle contacting.

In this aligned position. there is a latching bolt I5 in the handle which fits within a cylindrical recess longitudinally of the handle with the forward finger IS on the bolt engaging'within a recess I! in the rearward end of the head.

The bolt is held normally projected forwardly against the head by means of a coil spring l8 set within the recess and bearing against the rearward end of the bolt.

When my wrench is to be applied to the sucker rod joint the spring l2 and the latch bolt l5 will hold the handle and head in alignment as shown in Fig. 1. The head may then be easily hooked about the rod, the rod engaging within the socket 4 of the wrench. The wrench will then be swung around in a clockwise direction until the joint is approximately screwed up. To tighten the joint the handle will then be swung backwardly relative to the head as shown in Fig. 4 and in that position the spring l2 will slide longitudinally of the head and place the spring under tension. The latching bolt will be mo ed out of the shallow recess l1 and will contact with the upper face of the head. The handle will then be brought quickly back into its original position exerting a blow upon the head tending to tighten the joint. This blow will be delivered when the forward cam face ll of the handle engages the cam face 9 of the head. The handle will also contact with the shoulder on the raised portion mitted outwardly into the handle so as to tire the operator. There will be no dead shock on the handle although the torque will be exerted on the Joint to tighten it securely against un screwing.

There is a further advantage with this wrench that in throwing the handle backwardly, in order to strike-a blow upon the head as just described the forward end IS- on the handle will project across the forward portion of the socket in which the rod is received. This will not entirely close the opening but will tend to prevent the head of the wrench from being movedllngitudinally along the rod so as to be disengaged therefrom.

v 'I'he forward end I9 will partially close the opentighten or loosen the same and which will tend to' prevent the release of the wrench from the rod during the hammering operation.

The wrench is particularly eilicient in use for the reason that it does not tire the operator as much as would be the case where a shock of the 'blow in tightening or releasing the joint were delivered strongly at the end of the handle.

to normally hold said end in engagement with said shoulder, said handle being formed to be swung about its pivotal connection with said head and then brought back to jar said cam-shaped end against said shoulder, the jar being absorbed against said shoulder.

2. 'A wrench including a joint-engaging head, a handle pivotally connected with said head, saidhead being hook shaped and opening towards said handle and having a curved striking surface transverse to the length of said wrench,

a cam-shaped end on said handle adapted to engagesaid curved striking surface only, resilient means to normally hold said end in engagement with'said shoulder, means toreleasably latch said handle aligned longitudinally with said head, said handle being formed to be swung about .its pivotal connection with said head and then brought back to jar said cam-shaped end against said shoulder, the jar being absorbed against said shoulder.

3. A wrench including a hooked head having a rod engaging socket, a handle, a pivot-pin connecting said head to said handle, a curved forward end on said handle, a shoulder on said head having a surface inclined to the path of the forward end of said handle to be engaged obliquely by said end and extending past the latch on said handle engaging said head, said handle being adapted to be swung on said pin relative to said head to strike a blow with said curved end upon said shoulder, and means normally holding said curved end ainst said shoulder.

4. A wrench comprising a head having a hook portion to engage a rod and having a leg extending beyond the rod engaging part of said hook, a handle pivoted on said extending part of said head, said handle having a curved end projecting beyond the pivotal point to swing into the opening in said hookwhen moved in one direction, said head having a striking surface transverse to the path of said extended end of said handle, said handle being engaged only by said striking surface when swung out of the opening in said hook. Q

5; A wrench comprising a head having a hook portion to engage a rod and having .a leg extending beyond the rod engaging part of said hook, a handle pivoted on said extending part 30 ofsaid head, said handle having a curved end projecting beyond the pivotal-point to-swing intothe opening in said book when moved in onedirection, said head having a striking surface transverse to the path of said extended end of said handle, said handle being engaged only by said. striking surface when swung out of the opening in said hook, the projecting end of said handle having a cam surface to engage said striking surface of said head obliquely to the path of movement of. said extension.

6. A wrench comprising a head having a hook portion to engage a rod and having a leg extending beyond the rod engaging part of said hook, a handle pivoted on said'extending part of said head, said handle having a curved end projecting beyond the pivotal point to swing into the opening in said hook when moved in one direction, said head having a striking surface transverse to the path of said extended end of said handle, said handle being engaged only by said striking surface when swung out of the opening in said hook, and means to latch'said handle in shoulder engaging position.

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