| 摘要 |
A boat lift for a berth having permanently positioned piles in pairs spaced apart a distance sufficient to permit the boat to be berthed thereat to move between the paired piles while in the water includes a cradle having fore and aft transverse members upon which the boat is supported out of the water, a first pair of such piles equipped with first sheaves, a second pair of such piles with second sheaves, a third pair of such piles positioned between the first and second pairs adjacent the second second pair, first and second beams carried by the inside and outside piles of the second and third piles, motor driven winch drums supported by the first and second beams, third sheaves carried by the first and second beams, first inside and outside cables reeved respectively from the first and second drums via the first and second sheaves forward to the inside and outside piles of the first pair to lift the fore transverse member of the cradle, and second inside and outside cables reeved from the winch drums via the third sheaves to lift the aft transverse member of the cradle.
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