Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1979-10-15
1981-06-30
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
744115, 188 69, F16H 2132, F16H 5710
Patent
active
042756090
ABSTRACT:
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. 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.
REFERENCES:
patent: 1346949 (1920-07-01), Gibson et al.
patent: 1919903 (1933-07-01), Parsons
patent: 2855974 (1958-10-01), Heckethorn
patent: 3356185 (1967-12-01), Isaacks
Staab Lawrence J.
Streck Donald A.
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