Positive engagement safety mechanism and lift belt construction

Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary

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Details

187 77, 192 8A, B66B 526

Patent

active

045192626

ABSTRACT:
A self-energizing, positive engagement safety mechanism for long stroke, well pumping units, whether powered mechanically or hydraulically, and which employ a lift belt and counterweight. Upon failure of the sucker rod, polish rod or lift belt, a latching mechanism is actuated to engage a rack on both sides of the counterweight thereby to arrest and lock the counterweight against free fall. Actuation of the latching means is controlled by sensing belt tension below the counterweight thereby to enhance the sensitivity and reliability of the safety mechanism.

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