Launching platform for boats mounted on trolley - has hinged legs held by cable and pinned to submerged concrete block to lower platform below water

摘要

The platform (2) has a deck supported on I-beams. The beams are supported on lattice work legs (5,6) which are pinned at the base (8) to a mounting bracket fixed to a concrete block (9) embedded in the ground. The beams are also attached to the deck by the pins (7). The legs are suspended by a cable (10) fixed to a swivel point along the leg. The cable is wound on a drum (12) which is driven by the motor (13) through the worm gear (12). A safety latch (14) holds the deck in position.