Motion compensation winch

Details Motion compensation winch Motion compensation winch

1997-10-13

1999-10-26

Sotelo, Jesus D.

Ships

Life craft handling device, apparatus, or implement

Connector between boat and lowering tackle

254172, B63B 2300

Patent

active

059709065

ABSTRACT:
A motion compensation winch has a number of operating modes to launch and recover a boat and take into account wave movement. The winch has a cable drum for winding a cable thereon, a secondary gear reduction to rotate the drum, a primary gear reduction between a hydraulic motor shaft and the secondary gear reduction, a rotational sensor to sense direction of cable drum rotation, a load sensor to determine when a tension on the cable is above or below a predetermined value and a secondary clutch to disengage the cable drum and permit the cable drum to rotate freely. The winch has a manual mode for manual operation, and four operational modes, an automatic launch mode, a motion compensation mode to keep the cable taut while a boat rises and falls on waves, a free wheel mode and a recovery mode for recovering a boat that is rising and falling on waves.

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Constant-Tension Winch Safely Launches Rescue boats Richard Schneider & pp. 10, 11 The Work Boat Dec. 1987 & New Products--Winch System.
A Constant-Tension Winch System for Handling Rescue Boats S. Grant Christison pp. 220-228 Marine Technology vol. 25, No. 3, Jul. 1988.

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