US1756089A - Long-stroke pumping jack - Google Patents

Description

April 29, 1930. J, 5 HUNTER 1,756,089

LONG STROKE PUMPING JACK Filed Oct. 26, 1929 2 Sheets-Sheet 1 April 29, 1930. 1 s HUNTER 1,756,089

LONG STROKE PUMPING JACK Filed Oct. 26, 1929 2 Sheets-Sheet 2 go If; (o (o (o '(0 wy/m Patented Apr. 29, 1 930 JOHN S. HUNTER, OF GOALINGA, CALIFORNIAl LONGSTROKE PUMPING JACK Application led October 26, 1929. Serial No. l402,606.

This invention relates to a device for trans-. mitting rotary motion to reciprocating motion, and further relates to a device of this character which may be used as a long stroke pumping jack for reciprocating the pump rods ofa deep well pump.

In oil wells reciprocating pumps are often placed at great depths, with the result that the elongation and contraction of the pump rods of the pump play a very important part in the 'efficiency of the pumping' equipment. It is found that to increase the length' of stroke of a pump of the type used in pumping oil from wells will reduce the losses resulting in change of length of the pump rods or sucker rods as such parts are reciprocated.

Itis an object of my invention to provide a device which will economically and efficiently transfer rotary motion to a long reciprocating motion, it being possible tto make the length of the reciprocating stroke of any desired magnitude by merely changing the length of traveler members or chains and repositioning the guide members or sprockets over which these chains travel. .s

A further object of the invention is to provide a simple form of bracket means for connecting the traveler members or chains to a reciprocating member such as a string of sucker rods.

A furthergobject of the invention is to provide a simple means for preventing bending or disaligning of .the upper end of the polish rod of a string of sucker rods.

Further objects and advantages of the invention will be made evident throughout the following part of the specification. Referring to the drawings which are'for illustrative purposes only,"

Fig. l'is a front elevational view showing a device embodying the'present invention.

2 visa side elevation corresponding to Fig. 3 isa horizontal cross section on'a plane represented by theline 3-3 of Fig. 2,

Fig.'4 is a diagrammatic viewv for demoni' strating the operation of'thealignment com- I Avpensating device formingfpart ofthe invention.

5 is an enlarged partlyy sectioned de'- tail showing an alternative form of alignment compensating device.

In the embodiment of my invention represented in the drawings I show a frame 11 consisting of vertical posts 12 and 13 which extend upwardly from a base structure 14 and have their upper ends connected together by a cross bar 15. The base member 14 is adapted for mounting on the floor 16 of a derrick in such position that the posts 12 and 13 will be spaced on either side of a pump tubing 17 which projects upwardly from a well casing 18 and through the floor 16 of the derrick,

project forwardly from the posts 12 and 13, 7 shafts 26 and 27 are held in inwardly projecting positions of axial alignment, as shown in Figs. 1 and 3, and on the inner ends of these shafts 26 and 27 upper sprockets 28 and 29 are mounted. By means of lower brackets 32 and-33, lower shafts 34 and 35 are held in inwardly extended and axially aligned posi-v tion. it being preferable to place the lower shafts 34 and 35 in a vertical plane extending through the upper shafts 26 and 27. Moilnted on the inner ends of the shafts 34 and 35 are lower sprockets 36 and 37 which are vertically aligned with the respective upper sprockets 28 and 29. Over the righthand vertically aligned sprockets 28 and 36 a traveler member or chain 40 is carried, and over the left-hand pair of sprockets 29 and 437 From Fig.- 2 it will be noted that the axes a traveler. member or chain 41 is carried.

polish rod 20 all yextend in the same vertical I plane, and it vwill be further noted that the front and back, vertical portions 42 and 43 of the chain loops 40, and 41 extend parallel to and equi-distant from the vertical `plane defined by the axes of the sprockets 28 and 29, and 36 and 37.

Secured to the chains 40 and 41 is a bracket member consisting of right-hand and lefthand up er bracket bars 46 and right-hand and leftand lower bracket bars 47. flhe upper bracket bars 46 have bridge .portions 48 which extend externally over the chains 40 and 41 so that the bracket bars 46 may be secured to the chains 40 and 41 by means of pins 49, and the lower bracket bars 47 likewise have bridge portions 50 extending externally over the chains 40 and 41 so that the vbracket bars 47 may be secured to the chains 40 and 41 by vuse of pins 51. The upper bridges 48 and the lower bridges 5() are spaced apart on the chains 40 and 41, :and the bracket bars 47 extend convergently to v engagement with a horizontally directed pin 20or bolt 53, this pin or bolt 53 extending through the overlappinv extended ends of the bracket bars 46 and 47, through the lower ends of vertical hanger 'straps 54, and through a central roller which serves as a slide member within a slide or loop 56 in a sucker rod clamp member 57 which may 'be secured to the upper end of the polish rod 20. As shown in Fig. 2, the chains 40 and 41 Iwhich constitute traveler members are each guided by the respective upper and lower sprockets so as to form` flattened vertical loops having side portions 42 and 43 and having substantially semi-circular end portions where the chains extend over the upper and lower sprockets. The bracket 45 extends inwardly relative to the fiat loop formed by the chain 40 al ldistance substantially equal to half the width of the loop, or in` other words, half the distance between the vertical vportions 42 and 43 of the loop. From Fig. 2 it will be perceived that as the chains 40 and 41 move in a direction indicated by the arrow 58, the bracket 45 will be carried vertically downwardly, and the bolt 53 at the innerend ofthe bracket will travel through the vertical plane defined by the axes of the upper and lower sprockets 28 and 29, 36 and 3 Duringthis vertical movement of the reciprocating parts, the roller 55 willl rest substantially centrall within the laterally flattened loop 56, as s own in Figs. 2 and 4. When the bracket 45 reaches and -is carried around the lower sprockets '36 and 37, the roller 55 will be laterally offset for a short period of time, which will cause the roller to move laterally-into an offset position in the' loop 56,.as indicated by dottedy lines 60 of Fig. '4.` A similar lateral displacement will occur .when the bracket 45is carried around the upper sprockets 28 and 29. .This lateral disalignment is due tothe fact that the diagonal portions 61 of the up er :fand lower bracket ' arms 46 and 47 have a length which is greater thanv half the distance betweenthe vvertical yportions 42 and 43 ofthe chainloops. l The inward extension of the bracket 45 isthe altitude of a triangle formed by the bracket bars 46 and .47 and the ortion of chain extending between the bri ges 48 and 50 thereof, whereas the bracket bars 46 and 47 represent the sloping legs of such triangle.

For the purpose of producing movement vof the continuous traveling loop members formed'by the chains 40 and 41, I place a drive shaft 63 parallel to the lower shafts 34 and 35, and from sprockets 64 keyed near the ends of the drive shaft 63 I extend chains 65 over larger s rockets 66 which are keyed on the outer ends of the shafts 34 and 35. On one end of the shaft 63, such as the leftwardly projecting end 67 thereof, a drive pulley or sheave 68 of relatively large diameter is mounted. The sprockets 64 are of the same size, as also are-the sprockets 66, this resulting ina synchronous rotation of 85 the shafts 34 and 35 and the inner s rockets 36 and 37 when power is applied to t e drive shaft 63 through a rope or belt carried from a power source and over the pulley or sheave 68. l o At the upper end of the frame 11 I mount g cable sheaves 70 on a shaft 71 which extends between brackets 72. Over these sheaves 70 cables7 3 are carried from hooks 74, attached to the upper ends of the members 54, to a g5 counterweight which slides in a guide member 76. The counterweight 75 is of sulficient weight to substantially counterbalance` the weight of the moving parts of the pumping equlpment, thus reducing to a minimum the power that must be transmitted through f the chains 40 and 41.

To hold the sucker' rods in substantially vertical alignment during the time the roller i 55 is offset at the lower end of a pumping 105 stroke, I provide guide rollers 78, as indicated in dotted lines in Figs. 2 and 4 and as shown@ in'full lines in Fig. 1, these rollers being mounted at the upper end' of an A-sha ed`A supportingframe 79 which may be readlly 110 secured to the base 14 of the pumping equipment. The chain loops v40 and 41, as may be readily perceived from Figs. 1 and 2 are, centralized on aA single vertical plane which extends through the axes of the upper and 1'15 lower sprockets, but these 'chain loops are also situated in separate vertical planes extending parallel to o ne another, with'the result that the horizontal distance between the chains 40 and 41 is the same at every point.

In Figs. 1 to 4 of the drawings I4 have shown a meanswfor compensating for the'disalignment of the extended end of thel bracket 45 at the end of a stroke, this compensating means including a member 57 secured to the 126 upper extremity of the polish rod 20. In Fig. 5 I show-a compensating device which Ama be placed in any desired position on a polish rod so that the reciprocating mechavnism may be ready adjusted with respect to A1210 the length of the sucker rods, polish rod,'and the length of stroke of the pump. This com- 1,)ensatingmeans also provides a guide for the sucker rods to prevent disaligninent thereof when the reciprocating device is at the upper end of a power stroke. Accordingly, in Fig. 5 I show a polish rod 8O projecting through a clamp device 8l s0 that the upper end 82 thereof extends a distance above the device 81. .The clamp 81 consists of a pair of cooperating parts 83 and 84 which are clamped' on the polish rod 8O by means of bolts 85. In the parts 83 and 84 loops 86 and 87v are formed, these loops being horizontally flattened and equally spaced on opposite sides of the center line of the polish rod 80 so as to receive rollers 88 and 89 which are carried by a cross plate 90 by means of bearing members or pins 91. The center of the cross plate 90 is pivotally attached at 92 to the inwardly extending end of a bracket 93 carried by a chain 94, the parts 93 and 94 being respectively similar to the parts and 40 shown in the preceding ligures of the drawings. A guide tube or pipe 95 may extend from the clamp member 81 in vertically upward direction and in position surrounding the upper projecting end 82 of the polish rd 80. rAs shown to small scale at 96 in Fig. 5, the guide tube 95 extends between guide rollers 97 and is engaged by a hook 98 situated on the end of a cable 99 which extends to a counterweight 100. The clamp device 57 shown vin Figs. l to 4 can be employed only on the upper end of a polish rod, such as indicated at 20, but a clamp of the character shown at 81 in Fig. 5 may be situated at any desired intermediate point of adjustment on a polish rod 80, thereby making it possible to readily adjust the long stroke reciprocating mechanism or pumping device relative to the sucker rod system of a pump so as to produce greatest efficiencyl in the operation of such pumping mechanism.

Although I have herein shown and described a simple and practical embodiment of my invention, itnis recognized that certain parts or elements thereof are representative of other parts, elements, or mechanisms which may be employed in substantially the same way to accomplish substantially the same results; therefore, it is to be understood that the invention is not to be limited to the details disclosed herein but shall have the scope set forth in the following claim.

I claim as my invention:

A device of the character described, in

cluding: a pair of 4chain loops; an upper sprocket and a lower sprocket for each of said chain loops, said sprockets being so placed that said chain loops will travel through parallel vertical planes; means for causin travel of said chain loops over said sproc ets; a bracket extending inwardly from adjacent portions of said chains, the inward extension of said bracket being substantially one-half

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