Semi-adjustable service platform apparatus for gantry crane

Claim 1

A service platform apparatus for a gantry crane having a crane support structure, a horizontal boom structure and gantry, a trolley moveable on said boom and gantry, lifting ropes depending from said trolley and actuated by crane mounted hoist machinery, and a head block reeved to the lower ends of said lifting ropes, said service platform apparatus comprising a base frame adapted to be releasably secured to said head block, said base frame including a pair of horizontally sliding beams which are extendible in opposite directions from said base frame with either an integrated or independent movement, a pair of detachable towers secured to the ends of said sliding beams which project outboard from said base frame, said towers including detachable work platforms at the upper ends thereof, said towers being sized to stack on top of said base frame when disassembled and said base frame with the towers disposed thereon sized to fit into a standard 40' container along with the two work platforms when the platforms are stacked on top of each other and disposed in one end of the same container, and remote control means on said platforms for permitting an operator on a particular platform to independently control the reciprocating movement of the sliding beams for moving the platforms inboard and outboard relative to the base frame and to control the hoisting and translational motions of the crane trolley.