B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
254/93, 212/23.1
B66C 13/02 (2006.01)
Patent
CA 1120912
940-780030 MOTION COMPENSATOR AND CONTROL SYSTEM FOR CRANE ABSTRACT A motion compensation system for a crane hoist and control system therefor serve to assist the crane operator in safely lifting loads from the deck of a heaving work boat. The crane hook is allowed to follow the motion of the load because a level of pretension is maintained on the line (wire rope) by means of a counterweight connected to a four-part reeving system in the line. A hydraulic cylinder is connected to the counterweight to provide a means of locking movement of the counter- weight and also provides a cushion at both ends of the travel of the counterweight. Movement of the piston in the cylinder is controlled by means of a control system including a conduit having a check valve allowing flow between the rod end and the opposite end of the cylinder which permits the reeving system to take up line. This check valve may be bypassed by an operator-controlled switch to pay out line. A damping circuit prevents too rapid movement of the piston in a downward direction. A limit switch responds to movement of the piston and counterweight near the top of their travel to actuate a light to warn the operator of a need to pay out line. As the piston and counterweight approach the bottom of their travel which indicates the load is moving upward, another limit switch actuates a light to indicate time to lift the load. A relief valve is provided in parallel with the operator- controlled switch which responds to excessive load to reduce the pressure and permit more line to be paid out. A separate pressure- responsive switch responds to normal working pressure in the rod end of the cylinder to override the input to the operator-controlled switch during operation of the crane to prevent line from being paid out even though the operator might inadvertently provide an input to the operator- controlled switch.
352798
Continental Emsco Company
Frayne & Company Robert
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