Importance

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Abstract

An extensible lifting spreader frame for handling cargo containers comprises a pair of oppositely extending beam arms slidably received within a central pair of side-by-side connected sleeve beams. Beam cross arms at the outer ends of the sleeve beams mount twist-lock latching hooks at their opposite ends for attachment to the four socketed top corners of a cargo container for lifting the same. The frame is suspended from an overhead crane by four flexible suspension cables connected to the opposite ends of the cross arms. A pair of actuating cables operated from the crane operates mechanical cam-operated latch actuating mechanism. A pull cable, also operated from the crane, operates with pulleys on the sleeve beams to extend the beam arms from their retracted positions. Manually operable mechanism, also on the sleeve beams, inserts locking pins into aligned holes in the sleeve beams and beam arms to lock the arms in adjusted positions. The twist-lock hooks have associated safety locking devices, including touch pads, which prevent either of the latching hooks of a cross arm from moving between its latched and unlatched positions unless both hooks are properly positioned within corresponding sockets of the container top.

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First Claim