Patent ID: 6713697
Filing Date: 2004-03-30
Classification: H01H

Abstract:
A dust and moisture free switch, comprising:a hollow casing, having a bottom and an upper portion; a contact pole device, being inserted to the bottom of the casing, having a stationary pole and a support pole being inserted into and locating at a respective pole hole and having an arc pole attached to a top of the support pole such that the arc pole can swing leftward and rightward; a control plate, being joined to the upper portion of the casing, having a bottom thereof arranged a central hollow post to fit with an extensible stir lever, which has a bottom thereof contacting with the arc pole; and an isolation part, being made of soft high molecular plastic material, being passed through by fitting with the stir lever and being located at and closely joined to the casing at an inner wall thereof to perform a function of blocking dust or moisture to enter the bottom of the casing; wherein the casing at an inner wall thereof protrudes a spacing wall with a gap in between and the isolation part at a periphery thereof extends downward a joining edge being inserted into the gap to form a close joint; whereby, the stir lever can slide on the arc pole in case of an end of the control plate being pressed such that the arc pole can touch or detach from the stationary pole selectively to open or close a circuit.