Firing mechanism for a pyrotechnic flare signalling device
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United States of America Patent
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Aug 13, 2002
Grant Date -
N/A
app pub date -
Sep 28, 2000
filing date -
Sep 29, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pyrotechnic flare signalling device firing mechanism has a tubular casing with a master plunger projecting from one end and slidable in the casing in tandem with a slave plunger which is urged against a stop pin in the casing by a coil spring acting between the plungers. A probe on the slave plunger extends towards a firing pin at the other end of the casing. A ball is located in a dished recess between the firing pin and the probe. The diameter of the ball is such that thrust imparted to the slave plunger by extension of the coil spring is transmitted to the firing pin through the ball when the device is upright whereas the probe is always spaced from the firing pin when the bail is displaced to one side because the device is not upright. The master and slave plungers are formed with cooperating spiral ramp surfaces whereby the slave plunger is rotated within the casing by urging the master plunger into contact with it while compressing the coil spring between them, that rotation of the slave plunger displacing it from the stop pin and freeing it for axial movement towards the firing pin with expansion of the coil spring.
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