US2925806A - Hydraulic pump jack - Google Patents

Description

Feb. 23, 1960 H. TAYLOR 2,925,806

HYDRAULIC PUMP JACK Filed March 25, 1958 2 Sheets-Sheet 1 g l I N VEN TOR.

,y me 749 10 ATTDRN EYS Feb. 23, 1960 Filed March 25, 1958 H. TAYLOR HYDRAULIC PUMP JACK 2 Sheets-Sheet 2 I N VEN TOR.

Awmy my? ATTIII RN EYS United States atent O HYDRAULIC PUMP JACK Harry Taylor, Tremonton, Utah Application March 25, 1958, Serial No. 723,812

1 Claim. (Cl. 121 164) This invention relates to a hydraulic pump jack.

The object of the invention is to provide a hydraulic pump jack which is adapted to be used for pumping fluid from wells such as oil wells.

. Another object of the invention is to provide a hydraulic pump jack which is adapted to be used for pumping fluid or liquid from the ground, and wherein the hydraulic pump jack includes a means for continuously and automatically operating the pump jack so that the operation of a polish rod of a well head will be readily controlled. Another object of the invention is to provide a hydraulic pump jack wherein a means is provided for controlling the cycle of operations as the pumping is continued, and wherein the entire assembly is compact and ruggedly constructed and wherein the assembly is capable of adjustment so that the amount of fluid being pumped can be regulated as desired.

A further object of the invention is to provide a hydraulic pump jack which is extremely simple and inexpensive to manufacture.

, Other objects and advantages will be apparent during the course of the following description.

Inthe accompanying drawings, forming a part of this application, and in which like numerals are used to designate like parts throughout the same:

Figure 1 is a plan view illustrating the hydraulic pump jack of the present invention.

Figure 2 is an elevational view illustrating the hydraulic pump jack.

Figure 3 is a horizontal sectional view taken through the valve assembly.

Figure 4 is a sectional View taken on the line 44 of Figure 3.

Figure 5 is a view similar to Figure 2, but showing the parts in a different position.

Figure 6 is a view taken at right angles to the view shown in Figure 5 Figure 7 is a fragmentary elevational view showing the parts in the same position as that shown in FigureZ.

Figure 8 is a sectional view taken on the line 8-8 of Figure 5. j

Referring in detail to the drawings, the numeral 10 indicates a base such as a concrete base, while the numeral 11 indicates a conventional well head which has a vertically movable polish rod 13 connected thereto, and the well head 11 is provided with an outlet pipe 12 whereby oil or other fluid being pumped can discharge or issue out through the pipe or conduit 12. The numeral 14 indicates a cable which has one end connected to the upper end of the polish rod 13 as at 15, and the other end of the cable 14 is anchored to the base 10 as at 16-. The numeral 17 indicates a pulley which is arranged in engagement with the cable 14, and the pulley 17 is journ aled in a clamp 19 by means of a pin 18, the clamp 19 having a substantial U-shape, as for example asshown in Figure 5. The clamp 19 is secured to the upper end of a vertically movable piston rod 20, and the piston rod 20 2,925,806 Patented Feb. 23, 1960 projects upwardly from a vertically disposed hydraulic cylinder 21.

Extending outwardly from the lower portion of the clamp 19 and secured thereto in any suitable manner, as for example by welding is a finger 22, and the finger 22 is connected to the upper end of a vertically shiftable rod 23. A transverse lug 24 is mounted on the lower end of the rod 23. The numeral 25 indicates a bracket which is connected to the upper end of the cylinder 21, and extending upwardly from the bracket 25 is an arm 26 which has a bearing 27 on its upper end.

The numeral 28 indicates a vertically shiftable rod or shaft which projects through the bearing 27, and the shaft 28 has a pair of coil springs 29 and 30 mounted thereon, the springs 29 and 30 being arranged on opposite sides of the bearing 27. Secured to the shaft 28 is a pair of spaced apart blocks 31 and 32, and these blocks are adapted to be engaged by the lug 24 on the lower end of the rod 23, as the rod 23 moves up and down due to the movement of the piston rod 20.

There is further provided a horizontally disposed plate 33 which is arranged above the base 10, and extending upwardly from the plate 33 and connected thereto is a vertically disposed post 34. The numeral 35 indicates a lever which has its intermediate portion pivotally connected adjacent the post 34 by means of a pivot pin 36. One end of the lever 35 is pivotally connected to the lower end of the shaft 28 as at 37.

The numeral 38 indicates a body member which is supported on the plate 33, and the body member 38 includes upper and lower stop pieces 39 and 40. The numeral 41 indicates a movable bell crank which includes a first portion 42 that is mounted for movement between the stop pieces 39 and 40. A bushing 43 is connected to an end of the lever 35, and a coil spring 44 has one end connected to the bushing 43, while the other end of the coil spring 44 is connected to the portion 42 of the movable bell crank 41.

The bell crank 41 further includes a second portion 45 which is arranged at right angles with respect to the first portion 42, and the bell crank 41 further includes a third portion 46 which terminates in a rotary core 47. The core 47 is rotatably arranged in a chamber 48 of a housing 49, and the housing 49 is stationary. The housing 49 is further provided with a compartment 50, and passageways 51 and 52 communicate with the compartment 50, and the passageways 51 and 52 are adapted to selectively communicate with spaced apart ports or openings 53 and 54 in the rotary core 47. As shown in Figure 3 for ex-' ample, the ports 53 and 54 are offset with respect to each other for a purpose to be later described.

There is further provided a pair of spaced apart valve units of similar construction, and these valve units are the space 60 to the chamber 48. The numeral 63' in-- dicates a conduit which is connected to the space 61. The numeral 64 indicates a needle valve which is adjustable, and the inner end of the needle valve 64 is mounted for movement into and out of opening and closing relation with respect tothe aperture 59.

i It will be seen that the other valve unit 66 includes a stationary casing 65 which is provided with a partition 66 that has an aperture 67 therein, and the partition 66 defines in the casing spacers 68 and 69. The space 69 communicates with the chamber 48 through the medium of a conduit 70, and a needle valve 71 is adjustable, and the inner end of the needle valve 71 is mounted for move ment into and out of opening and closing relation respect to the aperture 67. A conduit 72 communicates with the space 68.

As shown in Figure 1, there is provided a conventional electric or gasoline motor 73 which rotates a pulley 74 that has an endless belt 75 trained thereover, and the belt 75 is also trained over a pulley 76 on a shaft 77, the shaft 77 being connected to a conventional oil pump 78. The numeral 79 indicates a tank or reservoir which is connected to the oil pump 78 by means of a conduit 80.

The numeral 81 indicates a conduit which has one end communicating with the compartment 50 in the housing 49, while the other end of the conduit 81 is connected to the lower end of the cylinder 21.

The operation of the hydraulic pump jack is as follows. With the parts arranged as shown in the drawings, it will be seen that the well head 11 communicates with the well which may be an oil well, and the well head 11 has the polish rod 13 extending upwardly therefrom. With the bell crank 41 in down position as shown in Figure 5, the port 53 communicates with the passageway 51 so that hydraulic fluid will be supplied through the conduit 62, through the port 53, through the passageway 51, and then into the compartment 50, and this hydraulic fluid will flow out through the conduit 81 into the lower end of the cylinder 21. This passage of the hydraulic fluid under pressure into the lower end of the cylinder 21 causes the piston rod 20 to move upwardly and this upward movement of the piston rod 20 raises the clamp 19 to thereby carry the pulley 17 upwardly. Since the pulley 17 has the cable 14 arranged in engagement therewith, it will be seen that this upward movement of the pulley 17 will cause the cable 14 to be raised, and since one end of the cable ,14 is anchored to the concrete base 10 as at 16, it will be seen that the connection 15 will cause the polish rod 13 to be raised so that the oil or other liquid being pumped will be pumped out or forced out through the discharge pipe 12 of the well head 11, and this fluid can be supplied or conveyed to any suitable area or location.

As the piston rod 20 moves upwardly as previously described, it will be seen that the clamp 19 will move upwardly to thereby raise the finger 22 which is secured to the lower end of the clamp 19, and since the finger 22 is secured to the upper end of the rod 23, it will be seen that the rod 23 will also be raised as the piston rod 20 moves upwardly. As the rod 23 moves upwardly, the lug 24 Will move up until it strikes or engages the upper block 31 on the shaft 28 and this will then cause the shaft 28 to be. raised from the position shown in Figure to. the position shown in Figure 2 for example. The. pair of coil sprlngs 29 and 30 provide a floating action for the moving parts and act as shock absorbers. The shaft 28 is adjustable or slidably supported in the bearing 27 on the upper end of the arm 26, and the arm 26 is secured to the bracket 25. i

As the shaft 28 is moved upwardly due to the lug 24 engaging the upper block 31, it will be seen that the lever 35 will be pivoted or rocked from the position shown in Figure 5 to the position shown in Figure 2 or to the position shown in Figure 7 since one end of the lever 35 is pivotally connected to the lower end of the shaft 28 by means of the pivot connection 37, the lever 35 being pivotally connected to the upstanding post 34 by means of the pivot pin 36. This pivotal movement of the lever 35 i will cause the spring 44 to move and when the spring 44 moves sufficiently past a horizontal plane, the spring 44 acts as an off-center snap spring so as to force or snap the. bell crank 41 from the position shown in Figure 5 to the position shown in Figures 2 and 7 and this pivotal movement of the bell crank 41 causes rotation of the core 47. It is to be noted that the stop pieces 39 and 40 on the body member 38 serve as limit stops so as to limit rocking or pivotal movement of. the body member 41.

As the bell crank 41 moves to the position shown in Figure 7' or to the position shown in Figure 2', it will be seen that the core 47 will rotate so that the port 53 will move out of registry with the passageway 51, and at the same time, the port 54 will move into registry with the passageway 52. This has the effect of preventing further flow of hydraulic fluid through the port 53, so that no further fluid will be forced through the conduit 81 into the lower end of the cylinder 21. At the same. time, the weight of the parts such as the clamp 19 and pulley 17 will permit gravity to come into elfect so that with no further hydraulic fluid being forced through the port 53, hydraulic fluid in the cylinder 21 beneath the piston rod 20 can drain back through the conduit 81, and then through the compartment 50, and this hydraulic fluid can then drain through the passageway 52 and out the port 54, and then through the conduit section 70, and this hydraulic fluid can then pass from the space 69 through the aperture 67, into the space 68 and then out through the conduit 72. The hydraulic fluid from the conduit 72 can then return to the reservoir 79 so that the piston rod 20 can return from a raised position to the position shown in Figure 5 and as the piston rod 20 moves downwardly, the finger 22 will move the rod 23 downwardly. As the rod 23 moves downwardly, the lug 24 strikes the lower block 32 so as to move the shaft 28 downwardly, and since the shaft 28 is connected to the lever 35, it will be seen that the lever 35 will be pivoted or rocked to the position shown in Figure 5. This movement of the lever 35 will cause the bell crank 41 to return from the position shown in Figures 2 and 7 to the position shown in Figure 5 so that the core 47 can return to the position shown in Figure 3 whereby hydraulic fluid can again be pumped from the reservoir 79 by means of the'pump 78 which is operated by the motor 73. Thus, this hydraulic fluid will flow through the conduit 80, then from the pump 78 under pressure through the conduit 63 and into the space 61, and this hydraulic fluid will then flow through the aperture 59 into the space 60, and then through the conduit 62. The hydraulic fluid under pressure from the conduit 62 will then flow through the port 63, then through the passageway 51, then into the compartment 50 and out through the conduit 81 so as to again raise the piston rod 20, and this cycle of operation is repeated so that the piston rod 20 will move up and down continuously as the motor 73' is actuated. This will have the eflect of causing the polish rod 13 to move up and down whereby oil or other fluid will be pumped out through the discharge pipe 12.

It is to be noted that the pair of valve units 55 and 56 provide a means whereby operation of the pump jack can be readily controlled. For example, by manually rotating either of the needle valves 64 or 71, it will be seen that the inner ends of the needle valves can bemovcd toward or away from the apertures 59 or 67 so as to provide a means for controlling the amount of hydraulic fluid which flows through these apertures and this adjustment can be used as a means of regulating the amount of hydraulic fluid flowing through the system so that the amount of oil or liquid being pumped from the well or the speed of pumping can be varied or controlled as desired.

The pair of springs 29 and 30 help maintain the parts such as the shaft 28 properly centered except when it is tripped.

The parts can be made of any suitable material and in diiferent shapes or sizes.

The hydraulic pump jack of the present invention can be madeor sold at a very low cost and it is small in size so that it can be conveniently shipped and also the compact arrangement permits the jack to be covered for protection against adverse weather conditions, and the device will operate with a small amount of power. Furthermore, an. important advantage of the present in vention is the wide range of speed adjustments which are possible, as. for example due to the provision of the The apparatus can be used on wells of different depths and the use of the cable lift provides a flexible unit. The valves 56 and 55 thus provide a means for regulating the speed of operation and these valves are independent of each other so that eithers stroke can be as fast or slow as desired and this is an important advantage over mechanical pumps.

It will be seen that with the motor 73 operating, the bell crank 41 will rock back and forth so that the piston rod 20 can move up and down as previously described whereby the polish rod 13 can move up and down in the well casing to pump oil out through the outlet pipe 12.

Minor changes in shape, size and rearrangement of details coming within the field of invention claimed maybe resorted to in actual practice, if desired.

I claim:

In a hydraulic pump jack, a base, a well head, a polish rod extending upwardly from said well head, a cable having one end connected to said rod and its other end anchored to said base, a vertically disposed cylinder supported by said base, a movable piston rod extending upwardly from said cylinder, a U-shaped clamp connected to the upper end of said piston rod, a pulley journaled in said clamp and engaging said cable, a finger secured to said clamp, a vertically shiftable rod having its upper end connected to said finger, a lug on the lower end of said last named rod, a bracket connected to said cylinder, an arm extending upwardly from said bracket and having a bearing on its upper end, a vertically shiftable shaft projecting through said bearing, coil springs circumposed on the upper portion of said shaft and said coil springs being arranged on opposite sides of the bearing, a pair of spaced apart blocks mounted on said shaft for engagement by said lug, a plate supported above said base, a post extending upwardly from said plate, a lever having its intermediate portion pivotally connected to said post and said lever having one end pivotally connected to the lower end of said shaft, a body member extending upwardly from said plate and including upper and lower stop pieces, a bell crank including a first portion mounted for movement between said stop pieces, a bushing connected to an end of said lever, a spring member having one end connected to said bushing and its other end connected to the first portion of said bell crank, said bell crank further including a second portion and a third portion, said third portion terminating in a rotary core which is provided with a pair of spaced apart ports, a stationary housing provided with a chamber which has said core rotatably mounted therein, there being a compartment in said housing, there being spaced apart passageways connecting said compartment to said chamber, a conduit connecting said compartment to the lower portion of said cylinder, first and second valve units each including a casing, a partition arranged in each casing and having an aperture therein, there being spaces, on opposite sides of the partitions, conduits connecting certain of said spaces to said chamber, and needle valves connected to said valve units and having their inner ends mounted for movement into and out of engagement with said apertures.

References Cited in the file of this patent UNITED STATES PATENTS 1,053,032 Harris Feb. 11, 1913 1,583,976 Gardner May 4, 1926 1,674,614 Berkman June 19, 1928 v1,801,259 Barks Apr. 21, 1931 2,564,285 Smith Aug. 14, 1951 2,636,233 Perkon Apr. 28, 1953 2,645,899 Aller July 21, 1953

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