| 摘要 |
A self-energizing, positive engagement, fail safe mechanism for long stroke, well pumping units, whether powered mechanically or hydraulically, and which employ a lift belt. Upon failure of the sucker rod, polish rod or lift belt, a wedge shoe breaking arrangement drops and engages to jamb the lift belt against a stationary brake beam. Any continued movement of the belt only forces the safety wedge shoe brake arrangement into tighter engagement with the lift belt and brake beam. The lift belt is attached to the yoke supporting the polish rod by a bracket, dual clamping plate, bolt, and nail or pin assemblage. This same assemblage may be used to attach a counterweight to the lift belt.
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