Constant-Tension Winch For Handling Rescue Boats Offered By Braden
The Braden Model PD12C-CT constant-tension davit winch and control system has been developed to reduce the risks involved when launching and recovering small boats over the side of a ship. During a launching operation, slack cable is available automati cally as soon as the boat rests on the water, allowing the cable to be pulled from the winch by hand. During a recovery operation, as the boat rises and falls on the waves, the davit-winch drum will yo-yo backwards and forwards, maintaining tension on the cable until the operator is ready to hoist the boat from the crest of a wave. This prevents the boat from being buffeted by the waves and avoids most of the shock loads that occur when a conventional davit winch is used. All control functions for the winch are provided by a single control lever.
The winch is designed to meet SOLAS requirements for factors of safety, brake capacity and gravity lowering, etc. Provision can be made for hoisting by means of a hand crank where required.
The winch is rated at 6,500 pounds line pull at speeds up to 200 fpm based on 2,200 psi and 54 gpm for the hoisting and lowering function. Line speeds in excess of 560 fpm can be provided with cable tension between 150-400 pounds depending on cable speed and direction in the constant-tension mode.
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