US2092986A - Polish rod grip - Google Patents

Description

Sept. 1-4,-\1937. R. c. PFEIL POLISH ROD GRIP Filed Feb. ll, 1936 2 Sheets-Sheet l w IIII Sept. 14, 1937. R. c. PFEIL POLISH Ron GRIP Filed Feb. l1, 1936 2 Sheets-Sheet 2 Patented Sept. 14, 1937 UNITED STATES IPATENTf'ortica.jv

POLISH non GRIPV v Roy c. Pfeil, Grove city, ohio, assignor ,to In.

ternational-Stacey Corporation, Ohio, a corporation of Ohio,

p Columbus,

Application February 11, 1936, serial No. 63,402 7 claims. (c1. :a4-'126) vThis invention'relates to gripping devices for clamping cables, rods or other members to enable the latter to withstand high tensile forces without slippage.

'It `is van object of the present invention to provide 'an :improved gripping or clamping Ydevice which is :primarily .constructed to connect vthe cables of an oscillatory pump beam with the vertically'reciprocable'polish rod of a well pump. In such a device, enormous strains, particularly in the matter of "deep wells, are present in the connections :uniting the polish rods with the beam cables, and it is the object of the inventionto so construct the clamping or gripping device as to enable the same to successfully absorb andqwithstand these stresses under operating conditions without Ainjury to the polish rods or cables or permitting slippage thereof whenjoined with -said .gripping or clamping device.

With these and other objects in'view,whch will appear as the description proceeds', 'the invention consists in ithe novel features of construction, combination of elements and varrangements of Vparts hereinafter fully described and pointed out init-he appended claims. Y v

In the `accompanying drawings:

liig. 1 is a view in 'front elevation of the' improved cable and rod gripping device ycomprising the present invention;

Figc-2 isV a horizontal sectional view taken' through the -device on the `plane indicated] v"by the -lineII-II'of Fig. 1;

Fg. '3 is a-vertical transverse sectional view on the line III-III of Fig. 1 and disclosing more .particularly the polish rod gripping means;

' 4 isa similar Vview on the lline IV-IV of Fig. 1, and disclosing the cable gripping means;

Fig. 5'is'a perspectiveview of the cable'gripp'ing jaws, illustrating the latter inseparated relation- 'ship;=

Fig. `6 is a' horizontal sectional view on the line VI-VIof Fig. 3. H

Y :In thezspecilc embodiment of ny invention illustrated yin said-drawings, my improved cable and rod `gripping device comprises a cast metal body I, y'1J-*shaped web 2,:in which is provided a vertically extending open-sided channel 3 of a length equivfaient 'to' the full height of the body "I.' The channel 3 -is adapted to receive'the upper portion of the polish rod 4 of a well pumping mechaynisrci, the polishV rod and the well'pumping appliances carriedthereby being supported by and suspended from the body I. The open side of the ,channel 3,.ollowing the positioningfof the Vpolish -formedfcentra'lly with a substantially rod 4 therein, is closed by meansrof a removable plate 5, the latter, as shown in Figs. landZ, being formed with integraljlaterally projecting ears 6, which .register with corresponding apertured ears 1. formed with andeprojecting fromthe upper and lower horizontally disposed flanges 8 of thebody I. Headed Ipins 9 :are'passed through Vthe registering apertures provided in ,the ears 6 and 'I to retainthe plate 'in its position of channel closure, the "lower :ends ofv said pins fbeing provided withcotter keys I0, vor their-equivalents', to prevent displacement of the pins. i1

i As'shown more particularlyin-Figs. 1 and 3,

the polish rod-issecured .irr1connection with the body .I'by the employment ofa -f-rictional gripping -means comprising a' casingillv which rests on the topof `the centralportion `of the body -I and is yinternally provided withfa pair of separable clamping members .-I2 havingV the Vcomplemental vertical faces thereof grooved as at I3 for the -K reception'fof the polish rod. The casing Il is provided with threaded openings I 4 for the reception of set screws I5, the inner ends of. which -frictionally Yengage one lofY said clampingmembers to force .the latter into gripping and supporting contact'with lthe rodi 14 when vsaid set screws are tightened bymeans or suitable wrenches. To Ifacilitate the Yrelease Yor separation of `the clamping rnernbers,.onev ofthe latter may be provided with a threaded-.bolt IIL-which Yprojects through an opening- IJ, formed in thecasingrll andhas itSouter-end provided,witlrr a head I8.

`A coiled expansion. spr-ing.Y I9 is disposed between Vthe outer surface of thecasing tII and a Y' onthe bolt I6-so that the.

carried therebywill be transmitted tothe body I-through the clampingl members I2 and the casing II, so `that the rise and fall of the body I, in unison with `an associated walking beam, will impart` corresponding motion to the -pump or polish-roda.

Since awalkingbeamis mounted for swinging movement in a vertical plane about a xed .horizontal turning axis, andsince the .polish rod is mounted to reciprocate .vertically, it is customary `suliiicient strength .to vsustain 3 in well operating apparatus to connect the polish Y v the tremendous weights imposed thereon by the polish rod and the pumping mechanism suspended therefrom and the weight of the column 0f liquid undergoing elevation through the casing of a well by the operation of the pumping appliances. In addition, the cables, by reason of their flexibility, compensate for variations in the relative positions of the arcuately swinging walking beam and the vertically movable polish rod.

In the accompanying drawings, the cables employed for this purpose are indicated at 2|, and it will be understood that the upper ends of said cables are adapted for connection with the operating head of a standard walking beam, not shown. To unite the lower ends of said cables in a secure, effective and non-slipping manner with the clamp body, the latter is formed, as shown more particularly in Figs. 1 and 2, to include on opposite sides of the web 2 a pair of boxlike anges 22, comprising an integral part of the body I and arranged between the `upper and lower flanges 8 thereof. The flanges 22 produce cable-receiving sockets 23 in the'body I, and the wall surfaces 24-24 of each of these sockets are tapered vertically, as shown in Fig. 4, so that the open upper ends of said sockets are narrower than the larger lower end portions thereof.

Arranged to occupy thesockets 23 are cable clamping jaws 25, there being a pair of such jaws for each of the sockets 23. The said jaws preferably comprise metallic castings having their inner vertical surfaces grooved as at 26 to receive a pair of the cables 2|. In addition, each of said jaws is provided with an inclined outer surface 21 adapted for engagement with the inclined surfaces 24-24 of the sockets 23. Integrally projecting from the inner vertical faces of the jaws 25 are intertting lugs or teeth 28, so disposed that when said jaws are in cable clamping engagement, relative vertical movement between the complemental jaws will be precluded. To hold these jaws in clamping relationship with the lower ends of the beam cables, the lower portions of said jaws are formed with registering horizontally disposed openings 29l through which pass the threaded shanks 30 of headed bolts 3l, the threaded portions of the shanks 30 being equipped with securing nuts 32. One of the jaws 25, as shown in Fig. 5, has its lower portion provided with a nut engaging enlargement 33 which is arranged approximately in the center of the jaw, while the corresponding enlargements 33 on the other mating jaw are disposed adjacent to the outer sides. By this arrangement, the nuts are relatively offset so that convenience is to be obtained in the matter of applying a wrench thereto.

It will be seen that by the tightening of the nuts 32, the jaws 25 will be drawn into firm frictional engagement with the cables 2I. In addition, due to the wedge- like surfaces 24 and 21, when the weight of the polish rod and its associated parts is applied to the body I, the latter will tend to press itself downwardly on the inclined surfaces 21 of the jaws 25, with theresult that the latter are pressed together in firm, nonslipping frictional contact with said cables, relieving the threaded connections 3I and 32 of excessive strain.

In applying this clamp head or grip to the polish rod and the beam cables, the polish rod is caused to assume its lowermost position as Well as the operating end of the walking beam. The jaws 25 are then clamped by means of threaded connections 3I and 32 on the ends of the cables, and the body I is lowered so that the jaws 25 will be received within the sockets 23. The plate 5 is then applied to the body I to retain the polish rod in connection with the channel 3, and the casing II is applied to the polish rod and lowered into contact with the upper surface of the grip body and frictionally clamped, by means of the set screws I5, in holding engagement with the polish rod. The walking beam may then be rocked in the customary manner to reciprocate the polish rod. As soon as the operating end of the walking beam begins its upward travel, the jaws 25, by reason of their wedge-like construction, engage with the surfaces 24 of the cable sockets formed in the body I and firmly grip said cables to prevent any slippage of the jaws on said cables. This enables the full weight of the polish rod and the materials suspended therefrom to be applied to the body I without loss of position on said body by reason of cable slippage. While the grip provides for the secure retention of the cable and rod parts connectedtherewith in their proper relative order, nevertheless, it has the advantage of being of strong yet simple construction and one which may be readily applied to associated well operating appliances without the use of special tools or other facilities. 1 The cable grooves 26 may, if desired. be rough-I ened as indicated at 34 to enable the jaws to obtain a firm grip on the cables. I The lugs 28 limit the side spreading or flattening action of the cables when the loads are'applied to cause the clamps to grip the cables.

While I have described the preferred form of thepresent invention, nevertheless it will be appreciated that the same is subject to variation l and having tapering outer surfaces conforming to the walls of the socket, and threaded means for maintaining said members' in frictional contact with a cable disposed between the-same.

2. A cable grip comprising a body formed with a tapered socket, a pair of relatively separable jaws having cable receiving grooves formed in the adjoining surfaces thereof, the outer surfaces of said jaws being tapered to conform with the configuration of said socket, and threaded means disposed exteriorly of said body for initially maintaining said jaws in clamping engagement with a cable positioned in said grooves.

3. A cable grip comprising a body including a socket having opposed relatively converging surfaces, a pair of separable jaw members positioned in said socket, said jaw members having the inner complemental surfaces thereof formed with cable engaging surfaces, the outer surfaces of said jaw members being inclined for wedge-like engagement with the converging surfaces of said socket, means for precluding relative longitudinal movement between said jaw members when the latter are in cable gripping positions, and means disposed exteriorly of said body for frictionally clamping said jaw members in engagement with a cable.

4. In a polish rod grip, a body provided with a socket having opposed converging surfaces, a pair of jaw members positioned in said socket, said jaw members having inclined outer surfaces formed Vfor wedge-like contact with the convergn ing surfaces of said socket, the inner surfaces of said jaw members being grooved for the reception of a cable, intertting lugs formed with the inner surfaces of said jaw members, and threaded securing devices passing transversely through said jaw members, exteriorly of said socket to initially tighten the jaw members in frictional contact with a cable positioned therebetween.

5. In a cable clamp, a pair of relatively separable jaw members, the inner mating surfaces of said jaw members being longitudinally grooved for the reception of a cable, interiitting relatively offset' lugs integrally formed with and project-V ing from the inner surfaces of said jaw members and serving to preclude relative longitudinal movement between said jaw members when the latter occupy cable engaging positions, and threaded fastening meansv passing transversely through said jaw members at one end thereof to draw the latter relatively into frictional clamping engagement with a cable disposed therebetween.

6. In a clamp, a pair of relatively separable jaw members, the mating surfaces of said jaw mem` Y bers being formed with integral interfitting and relatively offset Alugs by which relative longitudinal movement between said jaw members is precluded when the latter are in clamping relationship with a member confined therebetween, and securing means passing transversely through said jaw members for maintaining the latter in Y their clamping positions and against relative transverse separatio-n.

'1. In a clamp, a pair of relatively separable jaw members,the mating surfaces of said jaw members being formed with integral interfitting'and relatively oiiset lugs by which relative longitudinal movement between said jaw members is precluded when the latter are in clamping relationshipwith a member confined therebetween, and'securing meansV passing transversely through said jaw members for maintaining the latter in their clamping positions and against relative transverse separation, the outer surfaces of said jaw members being inclined to taper said jaw members vertically.

ROY C. PFEIL.

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