Traversing hoists – Overhead – Cable
Patent
1976-11-22
1979-01-16
Husar, Francis S.
Traversing hoists
Overhead
Cable
74519, 745225, 212 55, 214143, G05S 104, B66C 2306, B66C 2360
Patent
active
041345002
ABSTRACT:
A mobile derrick, aerial man lift or the like has a boom pivotally mounted at one end on a vehicle, with a hydraulic cylinder also pivotally mounted at one end on the vehicle for raising and lowering the boom. A linkage interconnects the other end of the hydraulic actuator with the boom while permitting limited relative movement between the interconnected points of the boom and the actuator. A resilient biasing means such as a compressed coil spring is connected to the linkage and resists downward movement of the actuator away from the boom. The linkage is responsive to upward movement of the actuator to form a rigid connection between the boom and the actuator and bypassing the biasing means, and is responsive to downward movement of the actuator to form a resilient connection between the boom and the actuator through the biasing means to permit limited downward movement of the actuator away from the boom against the urging of the resilient biasing means. The resilient connection protects the hydraulic actuator from the strains produced by abrupt forces, due to bending of the vehicle frame or the abutment of the boom against the ground or other rigid objects, for example.
REFERENCES:
patent: 1172255 (1916-02-01), Buck
patent: 2136663 (1938-11-01), Anthony
patent: 2635004 (1953-04-01), Shadwick
Husar Francis S.
Johnson R. B.
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