Apparatus for counterbalancing tongs

Details Apparatus for counterbalancing tongs Apparatus for counterbalancing tongs

1985-05-13

1987-02-17

Levy, Stuart S.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

With rotatable, cable contacting, pulley wheel element...

254392, B66F 324

Patent

active

046433996

ABSTRACT:
An apparatus for balancing tongs is comprised of a pair of fluid actuated piston and cylinder assemblies. The rod of each assembly carries a first pair of rotatably mounted pulley wheels, and a second pair of pulley wheels is mounted on the assembly in spaced relationship to the first set of pulley wheels. A cable is journalled around the pulley wheels, suspended over an elevated pulley and attached to a hydraulic tong for counterbalancing, lifting and lowering the tong. A bleed line permits fluid to escape from the cylinder as the hydraulic tong moves downwardly with a workpiece.

REFERENCES:
patent: 189424 (1877-04-01), Brewer
patent: 209336 (1878-10-01), Fensom
patent: 3799009 (1974-03-01), Guier
patent: 4023449 (1977-05-01), Boyadjieff

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