Patent ID: 6223862
Filing Date: 2001-05-01
Classification: B66B

Abstract:
In a tensioning apparatus useful in tensioning a plurality of cables of an elevator cable system relative the elevator support structure, each said cable terminating in a threaded rod at one end thereof extending through a corresponding opening in a hitching plate affixed to said elevator support structure and through the interior of a corresponding helical spring mounted on the opposite side of said hitching plate secured in suspension by an adjustment nut threadably engaged to said rod and advanced to compress the distal ends of each said spring, the improvement comprising:a platform operatively supported on said hitching plate in alignment above the free ends of said rod;a plurality of hydraulic cylinders mounted on said platform each in substantial alignment above a corresponding one of said rods, each cylinder including a piston hydraulically displaced in the corresponding one of said cylinders;a plurality of connector assemblies each including a connector threadably engaged to a free end a corresponding one of said rods and a coupler pivotally connected between said connector and a corresponding one of said pistons for limiting lateral loads thereto;a source of hydraulic fluid at pressure; andmanifold means connected between said source and each said hydraulic cylinder for applying substantially equal hydraulic pressure to each said piston whereby substantially equal load is transferred from each said rod to said platform to allow threaded adjustment of each said nut relative the corresponding one of said springs.