| 摘要 |
Apparatus for launching and retrieving a boat comprises a frame rotatably mountable on the deck of a vessel. The frame has rails defining a cradle for the boat. The rails are integrally joined to davit posts and crossbeams to form a rigid frame structure. An electrically operable ram is connected to the frame for rotating it on a horizontal axis. A cable is entrained on sheaves carried by the frame and terminates in a hook suspeneded from an arm over the boat. The other end of the cable is engaged by a motor driven winch to retract and to play out the cable. The boat can be provided with a centrally located sling engageably by the hook for hoisting the boat while the frame is rotated to shift the boat laterally. Spring loaded spring lines for steadying the boat can be provided. The ram and motor are operable automatically by a control circuit in predetermined launching and retrieval cycles. The boat can be provided with shiftable water ballast or mechanical balance means. The frame may have two arms supporting two cables for engaging spaced points on the boat to hoist it horizontally.
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