Limit Switch Device for an Actuator

Abstract

A limit switch device for an actuator comprises a brake rod, a mounting frame and two switches. The brake rod is axially movable with respect to the mounting frame. The two switches are mounted on the mounting frame and located in the axial direction of the brake rod and are connected to the actuator, respectively. When the actuator moves to the end of its travel, it will drive the brake rod to move and switch on one of the switches, and the switch will stop the actuator.

1 . A limit switch device for an actuator comprising a brake rod, a mounting frame and two switches, the two switches being mounted on the mounting frame and connected to the actuator, the brake rod being moveably inserted in the mounting frame and connected to a transmission shaft of the actuator; characterized in that:
 the brake rod axially reciprocates on the mounting frame, the two switches are juxtaposed on the mounting frame and located in an axial direction of the brake rod, a protruding block is disposed on the brake rod and located between the two switches, the brake rod is driven by the transmission shaft of the actuator to move axially, when the protruding block of the brake rod presses one of the switches, the switch will stop the actuator.   
   
   
       2 . The limit switch device for an actuator as claimed in  claim 1 , wherein the brake rod is provided with a first flange, a second flange, a stop block and two springs, the two spring are located at both sides of the first flange and push against the mounting frame, the second flange and the stop block are located outside the mounting frame, the transmission shaft of the actuator has a limit block mounted on the brake rod and located between the second flange and the stop block. 
   
   
       3 . The limit switch device for an actuator as claimed in  claim 2 , wherein the stop block is screwed on the brake rod.