Patent ID: 6484655
Filing Date: 2002-11-26
Classification: B63C

Abstract:
A three piling boatlift, comprising:an upstanding inboard piling; a pair of upstanding outboard pilings disposed in transversely spaced apart relation to said inboard piling and in longitudinally spaced apart relation to one another; a truncate rigid plate positioned in closely spaced relation to said inboard piling and in substantially parallel relation to said pair of outboard pilings; a first beam having an inboard end secured to a first end of said truncate rigid plate and an outboard end disposed in closely spaced relation to a first outboard piling of said pair of outboard pilings; a second beam having an inboard end secured to a second end of said truncate rigid plate and an outboard end disposed in closely spaced relation to a second outboard piling of said pair of outboard pilings; a cable drum assembly mounted to said inboard piling near an upper end thereof in vertically spaced relation to said truncate rigid plate; said cable drum assembly including a longitudinally disposed master cable drum and a slave cable drum disposed in transversely spaced apart, parallel relation to said master cable drum, said master cable drum and said slave cable drum being disposed in a common horizontal plane; motor means for rotating said master cable drum; interconnecting means for translating rotation of said master cable drum into simultaneous and corresponding rotation of said slave drum; a first master cable extending from a first end of said master cable drum to said first piling of said pair of outboard pilings, said first master cable adapted to lift said outboard end of said first beam when said master cable drum is rotated in a first direction and to lower said outboard end of said first beam when said master cable drum is rotated in a second direction; a second master cable extending from a second end of said master cable drum to said second piling of said pair of outboard pilings, said second master cable adapted to lift said outboard end of said second beam when said master cable drum is rotated in a first direction and to lower said outboard end of said second beam when said master cable drum is rotated in a second direction; a first slave cable extending from a first end of said slave cable drum to a first end of said truncate rigid plate, said first slave cable adapted to lift said inboard end of said first beam when said slave cable drum is rotated in a first direction and to lower said inboard end of said first beam when said slave cable drum is rotated in a second direction; a second slave cable extending from a second end of said slave cable drum to a second end of said truncate rigid plate, said second slave cable adapted to lift said inboard end of said second beam when said slave cable drum is rotated in a first direction and to lower said second beam when said slave cable is rotated in a second direction; whereby the weight of a boat lifted and lowered by said boat lift is distributed substantially equally between said first and second master cables and said first and second slave cables; and whereby all of said cables are in synchronization with one another so that the boatlift is lifted and lowered in a level plane.