Self-contained thermal actuator

Details Self-contained thermal actuator Self-contained thermal actuator

2004-11-04

2008-12-30

Jules, Frantz F. (Department: 3744)

Automatic temperature and humidity regulation

Thermostatic

Expanding fluid

C236S09900R, C236S09900R, C236S09300A, C236S09300A

Reexamination Certificate

active

07469841

ABSTRACT:
A self-contained thermal actuator positions the piston return member inside the actuator cup. The inventive configuration eliminates the guide and diaphragm seal that closed the open end of the wax filled cup in the typical thermal actuator configuration. The piston and an O-ring seal seated in an annular recess defined by the piston contain the thermally responsive wax. A return member within the cup and engaged between axially spaced, radially overlapping shoulders on the cup and piston biases the piston toward its pre-actuation position. The return member may be a spring or an elastomeric O-ring that also seals the thermal actuator against intrusion of contaminants from the use environment. The piston is closely received in the cup for guided axial reciprocation therein.

REFERENCES:
patent: 3427883 (1969-02-01), Kuze
patent: 3777495 (1973-12-01), Kuze
patent: 4036433 (1977-07-01), Wagner et al.
patent: 4278407 (1981-07-01), Yasuhara et al.
patent: 4346837 (1982-08-01), Inagaki et al.
patent: 4600317 (1986-07-01), Mori
patent: 5033865 (1991-07-01), Kuze
patent: 5119061 (1992-06-01), Kuze
patent: 5302993 (1994-04-01), Farling et al.
patent: 6988364 (2006-01-01), Lamb et al.

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