F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/71
F15B 11/16 (2006.01) B63B 27/10 (2006.01) B66C 13/02 (2006.01) B66C 13/18 (2006.01)
Patent
CA 1123708
ABSTRACT OF THE DISCLOSURE 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.
346877
Fetherstonhaugh & Co.
Hiab-Foco Aktiebolag
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