Telescopic trailer

Claim 1

In a telescopic trailer, the combination of a wheeled chassis, a lower body portion mounted on said chassis, an upper body portion slidably telescoped over the lower body portion for raising and lowering movement, and screw-actuated cable means for raising and lowering said upper body portion, said means comprising an elongated housing provided in said chassis, a shaft with oppositely screw-threaded portions rotatably journalled longitudinally in said housing, a pair of oppositely screwthreaded nuts engaging the respective oppositely screw-threaded portions of said shaft, said nuts being slidable but nonrotatable in said housing, a pair of cables connected at one end thereof to each of said nuts, guide pulleys provided in said chassis and adjacent the top of said lower body portion, said cables passing around said guide pulleys and being connected at their other end to said upper body portion whereby the latter may be raised or lowered by rotation of said shaft, the device being characterized by provision of means for individually adjusting the effective length of each of said cables independently of the others, each of said adjusting means comprising an adjustment block slidably but non-rotatably mounted in said chassis, a rotatable pulley on said block, and an adjusting screw rotatably journalled in the chassis and screw-threadedly engaging said block whereby the latter may be slid back and forth when the screw is rotated, the associated cable being looped around said pulley on said block and extending therefrom in the direction of sliding movement of the block, whereby the effective length of the cable may be adjusted by varying the position of the block within the limits of its sliding movement.