Electricity: electrical systems and devices – Igniting systems – For explosive devices
Patent
1992-10-07
1994-05-10
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Igniting systems
For explosive devices
222 5, 441 93, B63C 908
Patent
active
053113942
ABSTRACT:
A water-actuated, pressurized gas release device (10) that automatically actuates to inflate an associated personal flotation device when immersed in an electrically conductive fluid, such as salt or fresh water, is described. The device is comprised of a high strength plastic housing (12) that holds an enclosure tube (62) housing a primer charge (68) in a longitudinal alignment with a piercing pin (44). The primer is connected to a lever (80) and a lead wire (84) that is electrically connected to an electrical circuit means (87) which is in electrical contact with a pair of batteries (118A, 118B). When the device is immersed in water, an electrical circuit is formed between a terminal (122) of the battery pack and the lever and lead wire which serve as an electrical return to the electrical circuit means. This ignites the primer which creates explosive propulsion gases that drive a lance portion (46) of the piercing pin into a puncturable closure member (32) of a gas container (30) to inflate the personal flotation device. A conformal coating prevents the water from short circuiting the electrical circuit means until after the primer has been ignited. The gas container can also be manually punctured by actuating the lever which cams against the enclosure tube which moves against the piercing pin to drive the lance into the puncturable closure.
REFERENCES:
patent: 3426942 (1969-02-01), McMains et al.
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patent: 4768128 (1988-08-01), Jankowiak et al.
patent: 4927057 (1990-05-01), Janko et al.
patent: 5035345 (1991-07-01), Janko et al.
patent: 5148346 (1992-09-01), Naab et al.
Miller Francis M.
Naab Carlton W.
Conax Florida Corporation
Gaffin Jeffrey A.
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