Positive safety brake for oil well pumping apparatus
A safety brake adapted for positively locking the crank and counter-balance weights of oil well pumping apparatus against rotation, particularly for placement and servicing of the pumping unit is described. In the preferred embodiment shown, a cylindrical member is bolted to a brake drum which rotates in combination with the shaft from the gear box carrying the crank and counter-balance weights. The cylindrical member has a plurality of holes disposed about its periphery. A movable engaging bar is rotatably carried on a shaft mounted to a bracket adapted for connection to the bearing cap on the gear box adjacent the brake drum. The bar contains a locking tongue for engaging the holes in the cylindrical member. The bar is rotatable from a position engaged with the cylindrical member and a position removed therefrom. A spring bias is provided to hold the bar in either of the two positions. Additionally, a jerk bar, having a hammer weight thereon and a handle portion, is provided for striking the lock bar to forceably disengage the locking tongue from a hole of the cylindrical member when under rotational force.
- Assignee:
- IFI; EDB-82-000421
- Patent Number(s):
- US 4275609
- OSTI ID:
- 6161243
- Resource Relation:
- Patent File Date: Filed date 15 Oct 1979
- Country of Publication:
- United States
- Language:
- English
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