Fuel tank cap with pressure/thermal relief

Details Fuel tank cap with pressure/thermal relief Fuel tank cap with pressure/thermal relief

1989-10-10

1993-05-04

Fox, John C.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

220203, F16K 1304

Patent

active

RE0342386

ABSTRACT:
A valve plug (22, 22a, 22b) is biased inwardly by a spring (78, 78a, 78b) to close an opening (6, 6a, 6b) in a tank. A stem (32, 32a, 32b) extends axially inwardly from the plug (22, 22a, 22b). The stem (32, 32a, 32b) has an inner portion (36, 36a, 36b) which is mechanically interlocked with an outer portion (52, 52a, 52b) to directly transmit axial forces created by the spring (78, 78a, 78b). Fusible material (66, 66a, 66b) holds the stem portions (36, 36a, 36b, 52, 52a, 52b) in an interlocking position but carries only relatively small loads. The plug (22, 22a, 22b) and stem (32, 32a, 32b) move against the force of the spring (78, 78a, 78b) to relieve pressure. At elevated temperatures, the fusible material (66, 66a, 66b) melts to allow the stem portions (36, 36a, 36b, 52, 52a, 52b) to separate and the plug (22, 22a, 22b) and outer stem portion (52, 52a, 52b) to move away from the opening (6, 6a, 6b).

REFERENCES:
patent: 1994770 (1935-03-01), King
patent: 2357681 (1944-09-01), Morton
patent: 2375832 (1945-05-01), Tyden
patent: 2489787 (1949-11-01), Knowlton
patent: 3040764 (1962-06-01), Feinberg
patent: 3289686 (1966-12-01), Tyer, Jr.
patent: 3669302 (1972-06-01), Markarian
patent: 3918606 (1975-11-01), Keller
patent: 4325398 (1982-04-01), Green
patent: 4457325 (1984-07-01), Green
patent: 4458711 (1984-07-01), Flider
patent: 4487215 (1984-12-01), Green
patent: 4796777 (1989-01-01), Keller

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