Rostra Vernatherm, LLC

Alberto D Medina Santamaria

Kevin W Lamb

Kenneth Lionello

A dual mode thermal actuator (hereafter 'the actuator') includes a first cup defining a first chamber filled with thermally-responsive wax and a second cup defining a second chamber filled with thermally-responsive wax. A piston is disposed between the first and second cups. A first guide is received by the first cup. The first guide surrounds the piston and extends axially away from the first cup. A second guide is received by the second cup. The second guide surrounds the piston and extends axially away from the second cup. Expansion of the wax in the first chamber or expansion of the wax in the second chamber causes the actuator to go from a retracted position to an extended position. Expansion of the wax in the first chamber and expansion of the wax in the second chamber also causes the actuator to go from the retracted position to the extended position.

Dual mode thermal actuator

The temperature switch includes a housing, an actuator, a switch, and a force buffer situated between the actuator and the switch. The switch is movable between a first and second state in response to imposition and release of an actuating force F. The force buffer transmits the actuating force Ffrom the actuator to the switch when compressed a first distance in the first direction by extension of the actuator in response to an increase in temperature &#x394;T. At temperature T, the force buffer transmits the force Fto move the switch from the first state to the second state. The actuator retracts a second distance in the second direction in response to a decrease in temperature &#x394;T. At temperature T, the force buffer releases the force Fand the switch moves from the second state to the first state.

Dual set point temperature switch

A wax filled actuator includes a piston in direct contact with the thermally responsive wax material. A cup containing the wax is mechanically secured to a guide that receives and controls axial movement of the piston in response to expansion and contraction of the wax. A seal between the cup and guide prevents leakage of the wax. Another seal surrounds the piston and prevents leakage of the wax around the piston. In a disclosed embodiment, the piston has a cylindrical, polished outside surface that aids in preventing adhesion of the wax to the piston. In a disclosed embodiment, the seal surrounding the piston is a radially compressed annular elastomeric member. The seal surrounding the piston may be disposed between flat, annular wipers. The seal and wipers may be axially retained between the guide and a washer trapped between the cup and guide.

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Bristol, CT, United States of America

Alberto D Medina Santamaria