Patent ID: 6813886
Filing Date: 2004-11-09
Classification: F02G,F15B

Abstract:
A thermal actuation device comprising at least:a heat expandable or deformable material, heating means, means for electric power supply to such heating means, thrusting means, capable of movement following an expansion or deformation of such a material, so as to perform a substantially predetermined stroke length from a first to a second position, at least an actuation element, being linearly motioned following the action of said thrusting means, so as to perform a substantially predetermined stroke length with respect to a fixed structure or body of the device, from a first to a second position, elastic or resilient means, being apt to restore or return said thrusting means and/or said actuation element to their respective first position, further comprising motion multiplying means mechanically coupled to, and actuated in response to movement of said thrusting means through its stroke, said multiplying means not comprising any thrusting means but producing a greater stroke than the stroke of said thrusting means.