Propellant strip assembly and propellant charge structure
AssigneeSenco Products, Inc.
InventorDavid L. Remerowski
Life of this patent
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Abstract
A caseless propellant charge structure and sensitizer structure for safe ignition and cleaner gas generation. The sensitizer structure is comprised of a sensitizer material which is encapsulated in a protective binder material. The protective binder layer is broken during desired ignition in the combustion chamber. Meanwhile the propellant structure comprises an oxidizer rich layer which also contains fuel and a propellant layer. The oxidizer rich layer is adjacent the sensitizer structure in the strip assembly. The oxidizer rich layer allows ignition while foregoing the need for high concentration of oxidizer throughout the propellant structure thus reducing the mass of solids generated from the oxidizer combustion.
Claims12
A propellant charge structure for providing energy for operating a fastener driving tool, comprising:
- a first layer of ignitable first composition means comprising a first fuel material consisting essentially of nitrocellulose;
- a second layer of oxidizer rich second composition means, adjacent said first layer, comprising an oxidizer material and a second fuel material;
- and a third layer of sensitizer third composition means, in contact with said second layer, comprising a sensitizer material encapsulated within a binder material;
- wherein an impacting of said third layer causes said sensitizer material of said third layer to frictionally engage said second layer and ignite said fuel material within said first and second layers, thus generating energy.
A propellant strip assembly for use with a fastener driving tool, comprising:
- a plurality of propellant charges, with each of said charges comprising a first layer of ignitable first composition means comprising a first fuel material consisting essentially of nitrocellulose,
- a second layer of oxidizer rich composition means comprising an oxidizer material and a second fuel material,
- and a third layer of sensitizer third composition means comprising a sensitizer material encapsulated within a binder material and in contact with said second layer for activating said charge;
- a flexible carrying strip containing a plurality of chambers for holding each charge;
- a flexible cover strip for capturing each propellant charge within a chamber of said carrying strip;
- and means associated with one of said strips for feeding said strip assembly into a fastener driving tool.
Dependencies are inferred from the claim text.