Patent ID: 7121226

Claim:
A movable platform unit ( 1 ) for a boat (B), which includes a base portion ( 2 ), secured to the boat (B), and at least one swing arm ( 32 a, 32 b ) pivoted by one end to said base portion ( 2 ) and by the other to a loading platform ( 3 ), said at least one swing arm ( 32 a, 32 b ) being rotatable by a first drive member ( 57 ) secured thereto and rotatable about the pivoting axis (x) of the swing arm ( 32 a, 32 b ) onto the base portion ( 2 ), alignment means ( 67 , 68 ) being provided for connecting said platform ( 3 ) with a second drive member ( 65 a ) fixed to said base portion ( 2 ) and coaxial with the pivoting axis (x) of the swing arm ( 32 a, 32 b ) on the base portion ( 2 ), in such a way that the platform ( 3 ) is enabled to remain at a constant inclination to said base portion ( 2 ) during rotation of said at least one swing arm ( 32 a, 32 b ), characterized in that said first drive member ( 57 ) includes a pulley element securely fixed to said at least one swing arm ( 32 a, 32 b ) and operable to be rotated by first chain drive means ( 55 ), said chain drive means ( 55 ) and said pulley element ( 57 ) being enclosed within at least one hollow fixed arm ( 22 a, 22 b ) provided in a cavity ( 21 ) of the base portion ( 2 ), and said at least one swing arm ( 32 a, 32 b ) being pivoted to the distal end of said at least one fixed arm ( 22 a, 22 b ) in such a way that the swing arm ( 32 a, 32 b ) can assume a closed position, in which it lies flat in the cavity ( 21 ) of the base portion ( 2 ).