Heat sensitive actuator

Details Heat sensitive actuator Heat sensitive actuator

1990-09-26

1991-10-01

Ostrager, Allen M.

Power plants

Motor operated by expansion and/or contraction of a unit of...

Mass is a solid

F03G 706

Patent

active

050521810

ABSTRACT:
A heat sensitive actuator including a casing; a thermal expansion fluid contained in the casing; a piston rod inserted from an opening of the casing into the fluid and adapted to be moved outside the casing by thermal expansion of the fluid; a shoulder formed on an inner circumference of the casing at an opening portion thereof, which shoulder has a conical shape tapering inward of the casing; a plug formed of an elastic material such as rubber for sealing the fluid, which plug has a through-hole for allowing insertion of the piston rod; and an intermediate ring inserted in a part of the through-hole of the plug and interposed between an inner circumference of the plug and the outer circumference of the piston rod. The plug is forced into the shoulder to be elastically compressed and thereby radially urge an outer circumference of the piston rod. A contact area between the plug and the piston rod can be reduced by providing the intermediate ring to thereby reduce a frictional resistance of the piston rod.

REFERENCES:
patent: 3131269 (1964-04-01), Asakawa
patent: 3300134 (1967-01-01), Wahler
patent: 3395580 (1968-08-01), Kuze
patent: 3611713 (1971-10-01), Janous

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