초록 ▼

A portable walking beam pump jack for use in pumping liquids from an oil well having an elongated frame and an axle with wheels thereon mounted transversely on the frame for providing rolling transportation. Stabilizer pads are provided for securing the frame with respect to a ground location, after

A portable walking beam pump jack for use in pumping liquids from an oil well having an elongated frame and an axle with wheels thereon mounted transversely on the frame for providing rolling transportation. Stabilizer pads are provided for securing the frame with respect to a ground location, after transportation. An engine is mounted on the frame and rotates a counterweighted pair of arms which are journalled for rotation adjacent to the frame and parallel to the longitudinal axis of the frame. A drive yoke is connected between the counterweighted arms and a walking beam such that rotation of the arms drives the walking beam in a rocking motion. A foldable support assembly is mounted upon the frame and supports the walking beam. The walking beam can be connected to a sucker rod for pumping from a well. The support assembly is foldable from a first, fixed position in which the walking beam is raised for rocking in a pumping motion to a second, fixed position in which the walking beam is held in a lowered position for transportation. Preferably raising and lowering the support assembly is achieved by means of a hydraulic cylinder which extends from the frame to the support assembly.

대표청구항 ▼

A walking beam pump jack comprising: a substantially horizontally extending frame having a front end and a rear end; ground engaging wheel means connected to said frame for supporting said frame during transportation over a ground surface, said ground engaging wheel means including a pair of horizon

A walking beam pump jack comprising: a substantially horizontally extending frame having a front end and a rear end; ground engaging wheel means connected to said frame for supporting said frame during transportation over a ground surface, said ground engaging wheel means including a pair of horizontally spaced wheels; stabilizing means for securing said frame with respect to a ground location, said stabilizing means comprising: a front pad and a rear pad hydraulically extending from said frame to a ground surface location; first and second screw jacks extending between said front and rear pads, respectively, and said frame; and first and second pad arms, said first pad arm extending from said frame to said first pad and having one end pivotally connected to said frame, and said second pad arm extending from said frame to said second pad and having one end pivotally connected to said frame; a walking beam having a first end, a mid-portion and a second end, said second end being adapted for connection to a pumping rod; counterweighted, rotating driving means mounted on said frame and connected to said first end of said walking beam for rocking said walking beam in a pumping motion, said counterweighted, rotating driving means being rotatable between an elevated pumping position and a lowered transport position while remaining connected to said first end of said walking beam and while said walking beam is lowered from a pumping position elevated relative to said frame to a lowered transport position which is relatively lower in relation to said frame than said elevated pumping position, said counterweighted, rotated driving means including a pair of counterweighted drive arms journaled for rotation about a horizontal axis with said drive arms aligned with each other to concurrently occupy a common plane containing said axis of rotation, and said alignment of said drive arms being maintained at all points during the concurrent rotation of said counterweighted drive arms; a support assembly foldably mounted on said frame and upon which said mid-portion of said walking beam is pivotally connected, said support assembly being foldable from a first, fixed position in which said walking beam is pivotally supported in a relatively elevated raised, fixed position above said frame for rocking in a pumping motion while in said raised first, fixed position, to a second, relatively lower fixed position in which said walking beam is held is a lowered position relative to said frame for transportation, the movement of said walking beam between said first and second positions causing a concurrent movement between first and second positions by said counterweighted, rotating driving means which remains connected thereto during said movement; and hydraulic cylinder means connected between said frame and said support assembly for moving said support assembly between said first position and said second position thereof, and concurrently causing movement between its respective first position and said transport position of said counterweighted, rotating driving means connected to said first end of said walking beam.