Movable platform unit for a boat particularly for hauling and launching tenders and the like

A movable platform unit (1) for a boat (B), in particular for launching or hauling out a tender or similar craft, which includes a base portion (2), secured to the boat (B), and at least one swing arm (32a, 32b) pivoted by one end to the said base portion (2) and by the other to a loading platform (3), the said at least one swing arm (32a, 32b) being rotatable by a first drive member (57) secured thereto and rotatable about the pivoting axis (x) of the swing arm (32a, 32b) onto the base portion (2), alignment means (67, 68) being provided for connecting the said platform (3) with a second drive member (65a) fixed to the said base portion (2) and coaxial with the pivoting axis (x) of the swing arm (32a, 32b) on the base portion (2), in such a way that the platform (3) is enabled to remain at a constant inclination to the said base portion (2) during rotation of the said at least one swing arm (32a, 32b), characterised in that

• the said first drive member (57) includes a pulley element securely fixed to the said at least one swing arm (32a, 32b) and operable to be rotated by first chain drive means (55), the said chain drive means (55) and the said pulley element (57) being enclosed within at least one hollow fixed arm (22a, 22b) provided in a cavity (21) of the base portion (2), and the said at least one swing arm (32a, 32b) being pivoted to the distal end of the said at least one fixed arm (22a, 22b) in such a way that the swing arm (32a, 32b) can assume a closed position, in which it lies flat in the cavity (21) of the base portion (2).