US2173355A - Polish rod clamp - Google Patents

Description

Sept. 19, 1939. c. w. CRISW ELL 1 2,173,355 POLISH non cmmr Filed Feb. 24, 1938 I (M v I. 2 Charles W EPiEWEH Z 1 H m) 9 4% Patented Sept. 19, 1939 V UNITED STATES PATENT POLISH ROD CLAMP Charles W. Criswell, Eureka, Kans.

Application February 24, 1938, Serial No. 192,389

2 Claims. (Cl. 24-249) The present invention relates to clamps or Figure 4 is a plan view of the clamp, the polish gripping devices for the polish rods of pumping rod being shown in horizontal section. oil or water wells. Figure 5 is an enlarged vertical sectional view It is sometimes desirable to render the pumpon the line of Figure 4:100king in the direc- 5 ing mechanism of wells inoperative for pumping tion of the arrows. 5 purposes precisely upon the end of the upstrokes In the drawing: A designates Surface portion of the polish rods, by suspending the polish rods, of an or Water Such as Stuffing box;

sucker rods, etc., on the surface parts of the B P011511 rod; ctaflmp constructed wells, while the walking beams continue to move cordmg to the present tnventtong for at least short periods of time. In order to ac- The Clamp C D -Q am body portion 10 complish this, the clamp at the particular well 5 preferably of t m p as tnctude' must be assembled about the polish rod while it an abutment or blght portton t Provtdmg is moving and rendered tight thereabout at the Prlght abutment Wall 8 for engagmg the POhsh right moment. Polish rod clamps have been prot and spatedpttrattet sttppurts 9; Shdttble posed which require the use of wrenches to It for Qengagmg the pohsh t vertlca'uy operate threaded members of the clamps or other movable Wtth respect and .gutded by the suptools to drive wedges, but in practice these have ports 8; 1 meains H t t b the t t been found unsatisfactory at least to the extent 9 torcmg the t It Into mttmate gnppmg that they are often difiicult to assemble about reta'tmn to the pohsh the polish rods or cannot be operated to rip the By way of m the body pottton t may be 20 polish rods at precisely the moment when the tormed from a .plece of bat F bent at polish rods reach the ends of the upstrokes. Its Central portlon so that i mater fates .ttte

The present invention is designed to Overcome concavo-convex, thus producing an arcuate bight these disadvantages and has among its several portton t and spaced parttutt Supports Objects to provide a polish rod clamp which may 9, the lower faces I2 of WhlCh are in the same 25 be readily and quickly assembled about the polish plane t upon Surface part the Well as rod, say upon the stufiing box or other surface sttown m Figures 3 t It t a fitter part of the well, with comparative safety. and piece t be.welded m thetont'avtt'y of t then operated without the use of a wrench. hamblght pttrtton Instead of shapmg the conctwtty 3'0 mer or similar tool and without liability of movt preclsety the of t tough rod Surface 1t ing parts of the clamp rubbing on the supporting to engage In the exttmple shown t finer structure, to quickly and firmly grip the polish t body portlon artuttte m cross rod at recisely the moment when the polish rod the Inner t of which Is Struck from has reached h end of its upstroke a radius substantlally that of the polish rod 3;

and, a flange l5 engaging upon the upper face 5 ottter ob'tects of t t t ntovlde of the bight portion 1 where it may be welded 3 a polish rod clamp which is light in weight, has

as at it. The body portion M of the filler piece ample strength for the servlce recommended may be of less height than that of the main body and easily Operatedportion 6 of the clamp, as shown in Figure 3, 40 F rt er O ject and advantages the inVeTland welded at its lower end to the bight portion 40 i W app in h following detalled d p- 1, as at I1. This construction makes possible the tion, taken in connection with the accompanying production of filler pieces of different sizes, say drawing, forming apart of this specification, and for polish rods ranging from to 1 and a in which drawingselected filler piece, for the particular size polish Figure l is a perspective View of a polish rod rod, welded or made integral with the bight porclamp constructed according to my invention tion Hi. It also permits of the selection of a. shown in gripping relation to a polish rod. metal for the filler piece suitable for gripping Figure 2 is a side elevation of the clamp, showthe polish rod without liability of damaging same ing its relationship to a polish rod and support and which metal may be different from that used when the device is not in clamping relation to the in making the bight portion 1 and arms 9. In polish rod. the example shown the arms or supports 9 are Figure 3 is a view partly in elevation and partly provided with aligned circular openings M for in vertical section showing the relative position a purpose to be subsequently set forth. of the parts when the device is in gripping rela- The slidable jaw 10 may also be made of a tion to the polish rod. metal suitable for gripping the polish rod B with 55 least liability of damaging, and in the example shown comprises a polygonal body portion I9 of a size to fit freely between the arms or supports 9, and lateral flanges adapted to rest and slide upon the upper faces 2! of the arms or supports 9. This arrangement enables a workman to drop the jaw I0 into place after the remainder of the clamp has been assembled about the moving polish rod. The body portion l9 preferably has a concaved face 22 struck from a radius substantially that of the radius of the polish rod B; an opposite flat face 23 upon which means i 1 acts; and parallel side faces 24 for confronting relation to the inside faces 25 of the arms or supports 9. The body portion l9 terminates as at 25, short of the plane of the bottom faces l2 of the arms or supports 9, as shown in Figures 2, 3 and 5, so that no portion of the jaw It! engages the surface portion A of the well upon which the main body portion 6 rests. The jaw I8 is then thus free to move toward the polish rod without that friction which would occur if the body portion l9 terminated in the plane of the lower faces [2 of the arms or supports 9.

In the example shown, the means H preferably includes a cam 21, having a circular opening 28; a lever 29 rigid with the cam; a bolt 30 including a shank 3!, a head 32 and an eye 33 on the head 32; and, a cotter key 34 received in a transverse opening 35 in the end of shank 30 opposite head 32. The shank 3! is detachably received in the openings I 8 of arms or supports 9 and the opening 28 in cam 21. It is preferred to extend the lever 28 from the cam 27 in such relationship to the throw side 3'3 of the cam that when the lever 29 is upright, the throw side 3! of the cam is remote from the space occupied by the jaw I8, thus leaving ample room to drop the jaw H] into place, and when the lever 28 is swung away or downwardly from the polish rod B, the throw side 86 of the cam 2'! acts upon the face 23 of jaw l0 and forces it into intimate, gripping relation to the polish rod B. While I have shown in the drawing a stub lever 29, it is to be understood that this is merely by way of example, and that an extension, not shown in the drawing (such as a piece of pipe) may be placed on the stub lever to facilitate operation of the clamp.

When using the clamp, the workman, preparatory to assembling the clamp in proper relationship to the polish rod, removes the slidable jaw [0 from the main body portion 6, and dismembers the means H to the extent that the cotter key 34, the bolt 30 and the cam 21 are disconnected from the main body portion 6. The main body portion is then placed in embracing relation to the polish rod B, which may be moving up and down. Then means H is reassembled, and holding the lever 29 upright, the jaw l0 may be dropped into place intermediate the cam and polish rod. By close observation of the walking beam or other part of the motion transmitting means, the lever 29 may be swung downwardly at precisely the end of the upstroke of the polish rod, gripping the polish rod so as to suspend it and the parts carried thereby, on the surface portion of the well.

I claim:

1. A polish rod clamp comprising a body part substantially U-shaped in plan, including a bight portion and arms to lie in embracing relation to the polish rod and engage upon a surface portion of the well, a filler piece secured to said bight portion and having a concaved face struck at a radius substantially equal to the radius of the polish rod, a jaw slidable between and supported by said arms, said jaw terminating short of the plane of the bottoms of said arms and also having a concaved face struck at a radius substantially equal to the radius of the polish rod for engaging the rod at its side opposite said bight portion; and, means carried by said arms for forcing said jaw into intimate contact with the polish rod.

2. A polish rod clamp comprising a body part substantially U-s haped in plan, the bight portion of which to abut one side of the polish rod and the arms to lie in embracing relation to the polish rod and engage upon a surface portion of the well, a jaw for engaging said polish rod at its side opposite said bight portion, said jaw extending loosely between said arms, movable toward and from said polish rod, terminating short of the plane of the bottoms of said arms and provided with side flanges engaging and slidable along the top faces of said arms, whereby the jaw may be vertically placed or removed with respect to the body part of the clamp, and means detachably carried by the free end portions of said arms for forcing said jaw toward said bight portion and into intimate contact with the polish rod.

CHARLES w. CRISWELL.

Images