Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1988-02-22
1990-04-17
Smith, Gary L.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74 8921, B66B 526
Patent
active
049169599
ABSTRACT:
A long stroke well pumping unit including a drive motor, a pulley and band assembly, a carriage assembly, a counterweight assembly and a belt and pulley assembly. The pulley and band assembly includes first and second pulleys and a continuous band which extends between and engages the pulleys. One of the pulleys is driven by the drive motor. The pulleys are spaced vertically. The carriage assembly includes a block base, wheels rotatably attached to the block base and an outer frame. The block base is swivelly connected to the continuous band. The wheels rotatably engage the interior of the frame. The counterweight assembly is fixedly attached to the frame. The belt and pulley assembly has first and second ends, the first end being attached to the counterweight and the second being attachable to a polish rod assembly. As the well pumping unit operates, the drive motor drives the band around the pulleys. Since the block base is connected to the band, it also travels in a loop around the pulleys. This causes the carriage assembly, and thus the counterweight assembly and the polish rod assembly to be driven in a vertical reciprocating motion. During this movement, the block base and wheels move back and forth within the frame.
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Lively Gordon R.
Saether F.
Smith Gary L.
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