Patent ID: 7611128
Filing Date: 2009-11-03
Classification: A47C,F16H,H02K

Abstract:
1. A lifter comprising a housing, said housing defining therein an accommodation chamber; two transmission mechanisms mounted in said accommodation chamber at two sides, said transmission mechanisms each comprising a motor, said motor having an output worm shaft, a worm gear wheel meshed with said worm shaft and rotatable by said worm shaft upon rotation of said motor, said worm gear wheel having an inner thread in a hollow gear shaft thereof, a screw rod threaded into said inner thread of said worm gear wheel, and a push block fixedly fastened to one end of said screw rod and moved with said screw rod to move a load upon rotation of said motor; and two pairs of limit switches respectively fixedly mounted in said accommodation chamber inside said housing and adapted to control the direction of the motors of said transmission mechanism; said transmission mechanisms each further comprise a sliding block respectively fixedly mounted on one end of the associating screw rod opposite to the associating push block for touching said limit switches to cause said limit switches to the associating motor for limiting displacement.