Hydraulic cranes

Details Hydraulic cranes Hydraulic cranes

1980-03-10

1982-03-02

Sheridan, Robert G.

Traversing hoists

With haul-in line

212261, 414138, B66C 1304

Patent

active

043175244

ABSTRACT:
An improved hydraulic crane comprising at least one lifting cylinder to pivot the crane arm in a vertical plane relative to the crane post. A pressure-fluid line associated with the cylinder is connected to a movement-damping accumulator. In addition, a non-return valve is inserted between the cylinder and the accumulator to allow flow of pressurized liquid in one direction only away from the cylinder. A drainage line is connected to the accumulator, said drainage line incorporating a pressure-limiting valve. Owing to this arrangement, any added loads that arise as a result of sudden, shock-like pressures may be absorbed upon pressure relief in the accumulator without imparting jerky return movements to the crane arms.

REFERENCES:
patent: 3884359 (1975-05-01), Suverkrop
patent: 4166545 (1979-09-01), Martinussen et al.

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