Patent ID: 8109164
Filing Date: 2012-02-07
Classification: F16H,Y10T

Abstract:
1. A linear actuator, comprising a housing, a driving mechanism mounted in said housing, said driving mechanism comprising a motor, a spindle coupled to and rotatable by said motor, and a push rod coupled to said spindle for a linear motion upon rotation of said spindle, and at least one limit switch controllable by a transmission shaft to switch off said motor, wherein: said housing is formed of a first half shell and a second half shell, said first half shell and said second half shell being fastened together, defining an accommodation chamber that accommodates said spindle and said push rod of said driving mechanism, a front opening in communication with a front end of said accommodation chamber for the passing of said push rod to the outside of said housing, and a receiving chamber at one side of said accommodation chamber for the positioning of said at least one limit switch; said housing comprises a longitudinal seat set between said accommodation chamber and said receiving chamber, a series of transverse grooves located on said longitudinal seat and facing the inside of said accommodation chamber; each said limit switch comprises a switch body, a button suspending above said switch body for triggering said switch body by said push rod upon movement of said transmission shaft to a predetermined position, and a positioning device located on one side of said switch body for positioning in said longitudinal seat, said positioning device comprising a locating groove, which receives said longitudinal seat, and at least one protruding block suspending in one side of said locating groove and forced into engagement with said series of transverse grooves; and wherein said positioning device of each said limit switch comprises a retaining portion located on an opposite side of said locating groove and abutted against a bottom side of said longitudinal seat.