Patent ID: 7112753
Filing Date: 2006-09-26
Classification: H01H

Abstract:
1. A pressure switch comprising: a box having a space therein and including a close end and an open end; an outer cover connected to the open end of the box and an inlet defined through the outer cover; an inner cover engaged with the open end and having a central hole; a film located between the outer cover and the inner cover, a push portion extending from the film; an initializing device having a rod and a first spring mounted to the rod, the rod located in the space of the box and has one end extending through the close end of the box; a first plate having a pivot end pivotably connected to the inner cover and a through hole defined through the first plate, the first plate located between the first spring and the push portion, a mounting hole defined through the first plate and the rod extending through the mounting hole; a second plate extending through the through hole of the first plate and having a pivotal end which is located opposite to the pivot end of the first plate and connected to the inner cover, a lug located at a center of the second plate, and an activation device located above the first and second plates and including a frame and a pull rod which is connected to a center of the frame, a second spring member connected between the lug of the second plate and the pull rod, a first contact unit and a second contact unit located on two sides of the pull rod and connected to the frame, when the pull rod is pulled by the second spring, the first and second contact units are in contact with each other.