Patent ID: 6916086

Claim:
An electro-thermal actuator device ( 1 ) comprising a thermal actuator ( 6 ) having a body ( 8 ) containing a thermally expansible material (MD), a piston ( 7 ) partially inserted into said body ( 8 ) and seal means (MT) operating on at least one of said body ( 8 ) and said piston ( 7 ), an electric heater ( 10 ), capable of heating said body ( 8 ) in order to cause an increase in the volume of said expansible material (MD), and displacing said piston ( 7 ), a shaft ( 3 ) capable of sliding following displacement of said piston ( 7 ), electric terminals ( 11 , 12 ) for supplying said heater ( 10 ), wherein said body ( 8 ) and said heater ( 10 ) are arranged in an inner cavity (Z 1 , Z 2 ) of a casing ( 2 ) of the device ( 1 ), said shaft ( 3 ) has a first portion ( 3 A) constantly arranged within said cavity (Z 1 , Z 2 ) and a second portion capable of come out to the outside of said cavity (Z 1 , Z 2 ) through a passage formed at an end of said casing ( 2 ), said terminals ( 11 , 12 ) have each a first part positioned within said cavity (Z 1 , Z 2 ) and a second part protruding out of said cavity (Z 1 , Z 2 ), said casing ( 2 ) is formed by at least two half-shells or pieces ( 2 A, 2 B) mutually coupled or joined, an area of junction being present between said pieces ( 2 A, 2 B), which area is formed by two facing surfaces of junction (S), each surface pertaining to one of said pieces, characterized in that sealing means ( 15 , G; 31 , G 1 ; 31 , G 2 ; 31 ; R, 40 ) are provided, operatively arranged between said surfaces of junction (S) and cooperating with a respective piece ( 2 A, 2 B) of the casing ( 2 ) in order to hermetically insulate at least a part (Z 2 ) of said inner cavity (Z 1 , Z 2 ) with respect to the external environment.