Abstract:
A pyrotechnic initiator having an initiator including a relatively low monolithic ignition charge that is separated from an overlying output charge by an intermediary slip plane. The slip plane may simply be a non-integral junction between monolithic ignition and output charges, or it may be a junction between a monolithic ignition charge and a non-monolithic output charge, or it may be a void or barrier between the ignition and output charges.
Abstract:
A bi-propellant injector (66) includes a first injector element (68) and a second injector element (70) injecting a first propellant (69) and a second propellant (71), respectively, into a combustion chamber (53). A flame-holding zone igniter (74) is adjacent to and ignites recirculation of at least a portion of the first propellant (69) and at least a portion of the second propellant (71) within a flame-holding zone (76).
Abstract:
In a pyrotechnical drive (110) for a vehicle-occupant restraint system, has a cylinder (112), a piston (114) that is movably arranged in the cylinder, a pyrotechnical propellant charge (152) for generating pressurized gas, and an ignition charge for igniting the propellant charge. The piston has a thrust surface area (142) which can be acted upon with the pressurized gas in order to drive the piston (114). Between the ignition charge and the thrust surface area (142), a flow connection (F) is provided. In addition, a belt retractor (100) is described having a pyrotechnical drive of this type and a method for operating a pyrotechnical drive (110) of this type. In the method, the piston (114) is propelled over a first driving distance (Z1) by the gases generated by the combustion of the ignition charge (154) and is then propelled over a second driving distance by the gases generated during the combustion of the propellant charge (152).
Abstract:
A vehicle includes at least one polyoxymethylene structural support member. The polyoxymethylene structural support member includes a polyoxymethylene component that is a propellant that provides thrust to the vehicle upon pyrolysis or combustion of the polyoxymethylene component of the product of pyrolysis of the polyoxymethylene component. The vehicle can be a satellite or other type of spacecraft.
Abstract:
A foamable igniter composition effective to form a foamed igniter substance for use in an inflator device of an inflatable restraint system and a method for preparing a foamed igniter substance formed from the foamable igniter composition are provided. The foamable igniter composition includes a fluoropolymer binder oxidant, a plasticizer effective to render the fluoropolymer binder oxidant flexible, a metal fuel that is reactive with the fluoropolymer binder oxidant, a blowing agent effective to render the foamable igniter composition porous, and a crosslinking agent effective to structurally stabilize the foamed igniter substance. The foamed igniter substance is formed by heating the foamable igniter composition to a predetermined temperature. The consistency of the foamable igniter composition may be adjusted to allow the composition to be sprayed, extruded or molded as desired.
Abstract:
An apparatus comprises a vehicle occupant protection device (14) and a gas generating material (18). The gas generating material (18), when ignited, produces a combustion gas that actuates the vehicle occupant protection device (14). The gas generating material (18) comprises a single-base nitrocellulose composition that includes greater than 2%, by weight of the single-base composition, stabilizer. The stabilizer is a urea of an aromatic amine.
Abstract:
A dual stage hybrid inflation device includes a pressure switch that prevents the second stage pyrotechnic gas generator from being initiated when the additional heat and gas would overpressurize the first stage pressure vessel. As the pressurized gas stored in the first stage pressure vessel escapes the first stage pressure vessel, the pressure in the first stage pressure vessel drops. If the pressure in the first stage pressure vessel drops below the threshold pressure of the pressure switch, the pressure switch closes allowing the voltage signal to reach the pyrotechnic gas generator thereby initiating the second stage gas source. In an alternative embodiment, the pressure transducer is replaced by a pressure transducer or a temperature transducer and timing circuit. By delaying the initiation of the second stage gas source until after the pressure in the first stage pressure vessel has dropped below the threshold level, the appropriate augmentation of the compressed first stage gas can be realized without the necessity of designing the first stage pressure vessel to withstand initiation of the pyrotechnic gas generator under maximum inflation pressure conditions.
Abstract:
The present invention relates to a purified, easily produced poly-β-1→4-N-acetylglucosamine (p-GlcNAc) polysaccharide species. The p-GlcNAc of the invention is a polymer of high molecular weight whose constituent monosaccharide sugars are attached in a β-1→4 conformation, and which is free of proteins, and substantially free of single amino acids, and other organic and inorganic contaminants. In addition, derivatives and reformulations of p-GlcNAc are described. The present invention further relates to methods for the purification of the p-GlcNAc of the invention from microalgae, preferably diatom, starting sources. Still further, the invention relates to methods for the derivatization and reformulation of the p-GlcNAc. Additionally, the present invention relates to the uses of pure p-GlcNAc, its derivatives, and/or its reformulations.
Abstract:
A new chemical compound suitable for use as an explosive consists of guanylurea dinitramide having the formulawhich is also suitable as a main essential component for explosives, especially propellants; a pressed rocket motor charge; and a gas-generating component in gas generators for vehicle safety equipment, such as airbags.
Abstract:
An igniter composition for a gas generant and related methods of gas generation are provided in which the igniter composition desirably avoids or is not prone to being ignited by thermal means at ambient pressure conditions.