Hydraulic circuit for self-undecking crane

Details Hydraulic circuit for self-undecking crane Hydraulic circuit for self-undecking crane

1986-05-19

1987-05-05

Peters, Jr., Joseph F.

Traversing hoists

Having means facilitating assembly or disassembly

Of traversing hoist from support

212189, B66C 2344

Patent

active

046625275

ABSTRACT:
A self undecking crane in which the upper is separable from the lower and is supported on legs which are swingable from a stowed position to an operable position by cylinders. Hydraulic jacks on the ends of the legs raise and lower the upper relative to the lower. A hydraulic circuit controls extension and retraction of the cylinders and the jacks and includes a blocking valve which senses pressure in the jacks and precludes movement of the cylinder when the jacks are subjected to high pressure.

REFERENCES:
patent: 3814265 (1974-06-01), Miller
patent: 3856152 (1974-12-01), Parrett et al.
patent: 3941252 (1976-03-01), Six et al.
patent: 4124226 (1978-11-01), Phillips
patent: 4273244 (1981-06-01), Jensen et al.
patent: 4318550 (1982-03-01), Jacobsen

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