Heat activated plunger

Details Heat activated plunger Heat activated plunger

1976-07-16

1978-05-09

Blunk, Evon C.

Fire extinguishers

Automatic valves

137 70, 137 80, 141 20, 141348, 169 26, 169 30, 22240216, A62C 1324, A62C 1342, B65B 304, F16K 1740

Patent

active

040881920

ABSTRACT:
A heat actuated valve comprises a base adapted to be mounted on a fire extinguisher container. The base includes a passsage communicable with the container interior. A pair of stop fingers extend forwardly from the base. A fusible element interconnects the stop fingers. The base, stop fingers and fusible element are of one-piece, integral construction. A plunger is slidably mounted in the passage and includes a passage-blocking portion which blocks the passage when the plunger abuts the stop fingers during a fire sensing mode of operation. The plunger is slidable rearwardly to shift the passage-blocking portion to a first passage-opening position to allow the container to be filled. The plunger is operable, in response to melting of the fuse, to spread the stop fingers apart and travel forwardly sufficiently to shift the passage-blocking portion to a second passage-opening position, enabling the container contents to be discharged.

REFERENCES:
patent: 280376 (1883-07-01), Horton
patent: 3027352 (1962-03-01), Walling et al.
patent: 3536139 (1970-10-01), Berti et al.
patent: 3635264 (1972-01-01), Milburn
patent: 3638733 (1972-02-01), De Rouville et al.
patent: 3650328 (1972-03-01), Fujiki et al.

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