Metal hydride actuation device

Details Metal hydride actuation device Metal hydride actuation device

1980-01-23

1981-08-11

Spar, Robert J.

Fire extinguishers

Special applications

Condition responsive control

60527, 169 9, 169 26, 169 85, 222 83, A62C 3502, A62C 3718, B67B 724

Patent

active

042829313

ABSTRACT:
A self-recocking actuation device. One possible use for it is in conjunction with a pneumatic fire protection system. This invention employs the process known as occlusion to store large amounts of gas in a small volume. Metal hydrides in a chamber are used to store hydrogen in the disclosed preferred embodiment. Upon the application of heat--from a heat source like a resistance heater--the charged metal hydride releases its hydrogen (H.sub.2) in a chamber having only one exit opening which empties into a sealed bellows. This bellows contacts a piston located in another chamber wherein a biased resetting spring is provided to normally maintain the piston in contact with the bellows. As the pressure from the H.sub.2 gas builds up, it overcomes the biased spring to move it and the piston along with an associated pin or other actuator. If used to actuate a pneumatic fire protection system, the pin or actuator at the downward side of its stroke in turn, may puncture a shearable diaphragm or in some other way releases the contents of a container containing a second gas, like nitrogen (N.sub.2), which is then released from a second exit port in a different chamber to charge the fire protection system. Recocking of the piston begins as the heating of the metal hydride ceases. As cooling takes place the hydrogen is absorbed to reenter the hydride to decrease the gas pressure supplied. The piston's biased resetting spring then recocks the piston to its original position.

REFERENCES:
patent: 1933694 (1933-11-01), Allen et al.
patent: 2588788 (1952-03-01), Zell
patent: 3176460 (1965-04-01), Lindberg
patent: 3209937 (1965-10-01), Hirst et al.
patent: 3744816 (1973-07-01), Yamaguchi et al.
patent: 3776313 (1973-12-01), DePalma
patent: 3937284 (1976-02-01), Young
patent: 4178882 (1979-12-01), Anderson et al.

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