Device for igniting a propellant charge, a cartridge for the charge and a magazine for holding cartridges, especially for stud setting or driving tools
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United States of America Patent
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Dec 5, 1995
Issued Date -
N/A
app pub date -
Jul 18, 1994
filing date -
Dec 7, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for igniting a propellant charge is provided with a housing defining a cavity wherein a piston is displaceably guided. The cavity is connected via a bore acting as a nozzle to a chamber wherein a case member of a cartridge is arranged for accommodating the propellant charge. A bottom wall of the case member is equipped with a bore aligned with the bore acting as a nozzle. A primer wafer is disposed on the inner surface of the bottom wall, this wafer being thinner in its central zone than in its marginal zone. The central zone of the primer wafer is a region under mechanical thermal stress during compression, the ignition energy being introduced to the primer wafer via this region in the form of hot compressed air from the compression chamber.
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