Patent ID: 7607337
Filing Date: 2009-10-27
Classification: F03G

Abstract:
1. A two-way linear/dynamic force Multiplying device, comprising: a support, a lever having two opposite ends and pivoted at a point intermediate said two opposite ends on said support, a counterweight car movable along said lever, said counterweight car having an electrical motor for driving said counterweight car along said lever, a return counterweight movable between a raised position and a lowered position, a latch for releasably latching said return counterweight at said lowered position, a ratchet rotatably mounted to said support by a main shaft, a pulley rotatably mounted on said support adjacent said ratchet, and a chain having one end connected with one end of said lever and extending around said ratchet and said pulley and having an opposite end connected with said return counterweight.