Short-circuiting switch and electromagnetic projectile launcher incorporating the switch
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United States of America Patent
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-
Feb 25, 1992
Grant Date -
N/A
app pub date -
Dec 13, 1990
filing date -
Apr 13, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrical switch for switching large currents in a low voltage circuit consists of two opposing terminals (32) connected to conducting rails (20) of an electromagnetic projectile launcher (10), each terminal having two conducting arms (32A, 32B) which enclose the breech chamber (114) of the launcher. Conducting contacts (66A, 66B) bridging across the opposing arms of the terminals are rapidly lifted to open the switch when the contacts are exposed to propellant gas pressure exerted on a projectile armature (22) slideable within the chamber. Electromagnetic forces of repulsion, which act upon whichever contact is the latter of the two to lift off the terminals, assist simultaneity of current pathway severance across both arms, thereby suppressing arcing at switch opening.
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