Patent ID: 6052993
Filing Date: 2000-04-25
Classification: F03G

Abstract:
An actuator of the thermal type, which comprises:a body having a chamber for containing a material which expands as a function of the temperature of said body;a shaft, having one end directly dipped into said material, said shaft being movable as a function of the increase and decrease of volume of said material;closure and sealing means for said chamber and said shaft, comprising a closure element which is apt to mechanically cooperate with said body, at least a first sealing element which is apt to perform a first sealing on said shaft, and at least a second sealing element which is apt to perform a second sealing on said shaft,wherein said closure and sealing means comprise lower-support means for one of said first sealing element or second sealing element,said lower-support means being associated with said body at a pre-defined point,said closure element and said lower-support means delimiting a precise housing zone in said body for said first and second sealing elements.