US2115872A - Straight lift pumping jack - Google Patents

Description

May 3, 1938. A. N PORTER; 2,115,872

STRAIGHT LIFT PUMPING JACK Filed Aug. 21, 1936 2 Sheets-Sheet l y 38- A. N. PORTER' 2,115,872

STRAIGHT LIFT PUMPING JACK Filed Aug. 21, 1956 2 Sheets-Sheet 2 Y. I I n s V4 6 3 7 Z I1IIIIIIIIIIIIIIIIIII[III/q I I ;\\\\\\\\\\\\\\\\\I r} 4 z IIIIIIIIIIIIIIIIIIIIII/II h Ill:

INVENTOR lberf Al Porfel."

WHIIIHWM g ggn I l Patented May 3, 1938 UNITED STATES STRAIGHT LIFT PUMPING JACK Albert N. Porter, Tulsa, Okla assignor to J. F. Darby, Tulsa, Okla.

Application August 21, 1936, Serial No. 97,162

2 Claims.

This invention relates to well pumping appa ratus, particularly to pumping jacks of the straight lift type and has for its principal object to provide a pumping jack of this character which is of simple construction and which applies a direct lift on the rods thereby eliminating buckling or bending tendency during their reciprocation and reducing the power required to actuate the jack.

In accomplishing these and other objects of the invention, as hereinafter described, I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein:

Fig. l is a perspective view of the pumping jack embodying the features of the present invention.

Fig. 2 is a side elevational view of the jack.

Fig. 3 is a plan view of the jack.

Fig. 4 is a section on the line 4--4 of Fig. 2,

particularly illustrating the connection of the toggle actuating link.

Fig. 5 is a detail horizontal section through the toggle on the line 55 of Fig. 2.

Fig. 6 is a side elevational View of a modified form of jack.

Referring more in detail to the drawings:

l designates a foundation supporting a pair of longitudinally spaced sills 2 and 3 preferably of the channel type, and having their upper and lower flanges 4 and 5 turned inwardly to respectively form a bearing surface for the sills and attaching flanges for mounting the pumping apparatus.

Mounted on the rear ends of the sills are bearing brackets 5 and 1 each including an angle shaped base adapted to rest upon the flanges 5 and engaging the webs 8 of the sills, the brackets being secured to the webs by fastening devices, such as bolts 9. The bearing brackets include aligning bearing portions l0 and II mounting the terminal ends of a cross shaft l2. Pivotally mounted on the cross shaft between the bearing brackets is a post l3 for pivotally mounting a walking beam M. The post [3 has a bearing I5 fixed to its lower end by bolts I6 extending through flanges I! and through the lower end of the post, as best illustrated in Figs. 1 and 2.

The bearing 5 has a sleeve portion l8 receiving the shaft l2. The upper end of the post is provided with a similar bearing l9 having a sleeve portion 20 carrying a cross shaft 2| having its ends loosely mounted within the ears 22 and 23 of a bearing bracket 24 attached to the walking beam by means of flanges 25 and 26 secured to the walking beam by bolts 2'! extending through openings in the flanges and through the beam.

The walking beam 14 is preferably of I-beam construction and is of sufficient length so that the forward and rear ends 28 and 29 respectively project over the ends of the base to connect a'5 polish rod 36 and a plurality of counter weights 3| adapted to counter-balance the weight of the sucker rods (not shown) that connect the polish rod with the pump.

In order to retain the post I3 for limited rock- 10 ing support on the shaft l2 the sills 2 and 3 carry a vertical post 32 that is spaced forwardly from the post l3 and is of shorter length to allow free oscillatory movement of the beam. The post 32 is retained in perpendicular position by a brace 33 anchoring the post with the sills 2 and 3.

Mounted on the post 32 on the side thereof adjacent the post It is a bracket 34 having spaced ears 35 and 36 to mount one end of a toggle link 31, the toggle link being connected with the ears 20 by a pivot pin 38 extending through the ears and through the end of the toggle. The facing side of the post it is provided with a similar bracket 39 having an ear 40 connected with spaced toggle links M and 42, the ends of the toggle links being pivoted to the ear 40 by a pin 43. The free end of the link 31 extends between the corresponding ends of the spaced links 4| and 42 to pivotally connect therewith by a cross pin 44 having projecting ends 45 and 46 (Fig. 5) pivotally connected with a yoke 41 formed on the end of a control link 48. The control link 48 extends upwardly from the toggle links and pivotally connects with ears 49 and 50 attached to the lower flange of the walking beam, the upper end of the control link being pivotally connected with the ears by means of a cross pin 5|.

With the construction thus far described, it is obvious that the toggles support the post l3 in substantial perpendicular position and that when the forward end of the walking beam moves downwardly responsive to an actuating unit 52, the toggle links break downwardly as shown by the dotted lines in Fig. 2 to rock the post l3 in a forward direction on its shaft 12. Likewise as the beam moves from its lowermost position in lifting the rods the post l3 rocks rearwardly but as the beam reaches substantially horizontal position the toggle links break upwardly to again cause forward rocking movement of the post. The rocking movement of the post produces a forward shifting movement of the beam so that the forward end of the beam moves in a perpendicular plane during its oscillation by means of an actuating unit.

The actuating unit may be of any type but is shown as including a transmission indicated by the housing 53 that is mounted on the forward ends of the sills 2 and 3 and which has a driven shaft 54 carrying cranks 55 and 56 on the respective ends thereof. The cranks 55 and 55 are provided with a series of wrist pin openings 5'! and 58 to selectively mount wrist pins 59 and 60. Pivotally connected with the wrist pins are pitmans BI and 62 having their upper ends pivotally connected to trunnions 63 and 64 on a cross head 65 that is attached to the lower flange of the walking beam. The transmission includes a driving shaft 66 that is actuated by a motor 61 also mounted on the sills 2 and 3 at a point between the transmission and the fixed post 31, the motor being operably connected with the shaft 66 by means of a belt 68 operating over a pulley 69 on the motor shaft and over a pulley 10 on the shaft 66.

The forward end of the walking beam carries a bracket H for attaching a T-shaped head 12 connected with the upper end of a polish rod 30, the polish rod being in turn connected with the string of sucker rods that are reciprocably mounted with a pump tubing 13.

In installing a pumping jack constructed as described, the foundation l is constructed adjacent the well, indicated by the casing M, and in such a position that when the beam I4 is substantially horizontal the attaching point of the polish rod 3!! with the bracket II will be in alignment with the central line of the well. The pumping jack is then assembled upon the foundation and the wrist pins 59 and 50 of the pitmans are inserted in the proper holes 51 and 53 to provide the desired stroke of the beam. The beam I4 is then connected with the polish rod 30 and the motor 61 started to rotate the cranks 55 and 56 which in turn oscillate the beam through the pitmans El and 52. As the cranks move to- Ward upper dead center position the toggle links break upwardly by reason of their connection with the walking beam through the control link 48 causing the post l3 to rock forwardly to shift the walking beam in a forward direction simultaneously with its upward movement, thereby maintaining the rod in straight condition and providing a vertical lift of the rod. As the cranks move past top dead center the action reverses and the toggle links begin to straighten out effecting rocking movement of the post in the opposite direction until the walking beam reaches a substantially horizontal position whereon the toggles again break downwardly to cause forward rocking of the post I3 to again shift the beam in a forward direction.

Since the length of the toggle links and the control link are the proper dimensions, and with their pivotal centers in definite fixed relation with the pivotal points of the post l3, the rod is kept in axial alignment during the entire movement of the beam.

The form of the invention shown in Fig. 6 is substantially the same as that illustrated in Fig. 1, however, the actuating unit 15 is mounted at the rear end of the sills 2 and 3 and the cranks 16 thereof connected with the rear end of the walking beam, otherwise the construction is identical to that illustrated in the preferred form.

From the foregoing, it is obvious that I have provided a pumping jack of simple construction and which provides a straight lift thereby eliminating buckling and bending of the rods tending to crystallization and wearing of the polish rod stufiing box.

What I claim and desire to secure by Letters Patent is:

1. A pumping apparatus including a support, a beam supporting member, means pivotally anchoring the beam supporting member on the support for oscillatory movement, means for oscillating-the beam, a toggle joint having one end pivotally connected with the beam supporting member at a point above the support, a fixed post spaced from the beam supporting member, means pivoting the other end of the toggle joint to the fixed post at a point spaced above said pivotal mounting means, and a link connecting the toggle joint with the beam for actuating the toggle joint incidental to oscillation of the beam to oscillate the beam supporting member.

2. A pumping apparatus including a support, a beam supporting member, means pivotally anchoring the beam supporting member on the support for oscillatory movement, a crank rotatably mounted on the support, a pitman connecting the crank with the beam for effecting oscillation of the beam, a fixed post spaced on the support from said beam supporting member, a toggle joint connecting the beam supporting member with the fixed post, and a link connecting the toggle joint with the beam for actuating the toggle joint incidental to oscillation of the beam to oscillate the beam supporting member.

ALBERT N. PORTER.

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