44 results about "Pyrotechnic initiator" patented technology

An device for use in an electro-pyrotechnic initiator comprises a header, a foil resistive strip, a substrate, and a current source. The substrate is mounted on the header. The foil resistive strip is mounted on the substrate. The energy source is connected to the resistive strip. When current flows through the resistive strip, the resistive strip generates enough heat to spark autoignition of a pyrotechnic material. The pyrotechnic material is in direct contact with the resistive strip. For an energy input of up to 115 microjoules, the resistive strip can cause autoignition in less than 25 microseconds. In a second embodiment, an electro-pyrotechnic initiator for use in a "smart" airbag system comprises a header, a foil resistive strip, a substrate, a current source connected to the resistive strip, and a control circuit. The control circuit is designed such that it will cause current to flow through the resistive strip when the circuit receives an appropriate signal. A ceramic capacitor can be used as an energy source for the resistive strip.

Enhanced airbag modules and associated methods are provided. An airbag module according to the invention may have a cushion with an inflatable protection zone and a flexible venting tube coupled to the inflatable protection zone. A closure mechanism may be used to compress the flexible venting tube against an anchoring member, such as a housing of the airbag module or a vehicle feature, until venting through the flexible venting tube is needed. The closure mechanism may then be actuated, for example, by igniting a pyrotechnic within a specially designed bolt of the closure mechanism. The bolt may, for example, have a bore with a pyrotechnic initiator molded-in-place within the bore. The bolt may fracture to open the closure mechanism, thereby permitting inflation gas to flow out of the inflatable protection zone via the flexible venting tube.

An actuator connected to receive high pressure gas from a pyrotechnic initiator incorporates a primary piston and a secondary piston mounted for limited movement along cylindrical bores in a housing; the pistons are held in a fixed inactive position and are restrained from movement within the housing by a tension screw connected to the primary piston and the housing. The tension screw incorporates a calibrated reduced diameter section that ruptures at a predetermined applied force to permit the pistons to move within the housing. Gaseous products resulting from initiation are trapped and maintained within the housing by an expandable bellows secured internally of the housing at one end of the bellows and secured at the opposite end of the bellows to the interior of the housing. A calibration/test port extends through the housing into the bore externally of the bellows to permit calibration and testing of the actuator without initiating the pyrotechnic device.

A pyrotechnic initiator with enclosed on-board control circuitry, and a mating connector therefor.

A pyrotechnic initiator having an internal sleeve that facilitates the loading and durable retention of a pyrotechnic charge in place on the header surface within the initiator. The sleeve beneficially retains the charge either in conjunction with the upper interior surface of the charge can, or through the use of a monolithic charge and a narrowed top end of the sleeve.

A pyrotechnic switching device comprising a first and a second pyrotechnic initiators, and a body in which are present: an electrically conductive portion, and a mobile switching element having an insulating relief facing the conductive portion. The device also comprises a fuse element connected in series with the conductive portion, the first initiator being connected to the terminals of the fuse element so that tripping the fuse element actuates the first initiator, each initiator being configured to cause the device to switch from a current conducting configuration to a current interrupting configuration, the mobile switching element being set in motion toward the conductive portion in order to break it by the impact of the relief during switching from the first to the second configuration.

The present invention relates to a hybrid type gas generator for a motor vehicle safety device, the generator comprising at least: a combustion chamber (C) containing a pyrotechnic initiator (4) and pyrotechnic charge (5) for generating gas and including at least one oxidizing material, with combustion of the charge being triggered by said initiator (4); and a gas tank (3) that is closed towards the combustion chamber (C) by a capsule (8), the capsule being suitable for giving way during combustion of said charge (5) in order to release the gas from the tank (3) and exhaust it towards the outside, the generator being characterized by the fact that said combustion chamber (C) also contains a charge (9) of least one metal, said charge being distinct from the pyrotechnic charge (5).

A breaker device for connecting in an electrical circuit, the device includes a pyrotechnic initiator and a body having present therein: a pressurizing chamber in communication with an outlet from the pyrotechnic initiator; at least one electrically conductive portion for connection to the electrical circuit; at least one fusible element connected in series with the conductive portion, the initiator being connected to the terminals of the fusible element and the fusible element being configured to trip when the current passing through it exceeds a predetermined value, thereby actuating the initiator; and a movable breaker element; the pyrotechnic initiator being configured to cause the breaker device to pass from a current-passing first configuration to a circuit-breaking second configuration, the movable breaker element being moved on passing from the first configuration to the second in order to disconnect the conductive portion.

The invention relates to a pyrotechnic gas generator (10) for a motor vehicle safety airbag (12), comprising a pyrotechnic charge and a pyrotechnic initiator (28) which is situated in a combustion chamber (14) and able to be actuated by a first detection system (30) intended to detect an imminent collision state and/or by a second detection system (32) intended to detect an authenticated collision state. The pyrotechnic gas generator according to the invention further comprises a passage (16, 18) along which gases can flow between the said combustion chamber (14) and the said airbag (12), andat least one valve (34) that can be moved from a first position in which it defines a first bore section into a second position in which it defines a second bore section greater than the said first bore section, or vice versa. In particular, the valve (34) is designed to define the larger bore section when the pyrotechnic initiator (28) is actuated by the first detection system (30).

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.

A pyrotechnic actuator for a power cutting tool is disclosed. The pyrotechnic actuator comprises a housing defining a cavity therein, a piston positioned at least partially within the cavity, and an insert-molded unitary assembly positioned within the cavity. The unitary assembly comprises a piston engagement member and a base. A sealed void is defined intermediate the piston engagement member and the base. The unitary assembly comprises a breakable member extending intermediate the piston engagement member and the base and a pyrotechnic initiator positioned at least partially within the base. The pyrotechnic initiator, upon application of a current pulse thereto, is configured to generate a pressurized gas in the sealed void that exerts a force on the piston engagement member and breaks the breakable member thereby causing the piston engagement member and the piston to move relative to the base and the housing.

Igniter base for a pyrotechnic initiator has a glass base together with fused-in contact pins that function as a pole carrier and thus fixes the contact pins in secure correlation to one another. The end side of the glass base and the contact pins form a level plane, so that an ignition bridge resting flush on the glass base can be attached to the poles. The contact pins project beyond the glass base on the opposite side and a part of the glass base and a part of the contact pins projecting beyond the glass base are equipped with a plastic jacketing.

A method of fabricating an opto-pyrotechnic initiator, includes a) forming a body having a cavity in which a pyrotechnic charge is to be received, the body also having an internal passage extending between the cavity containing the pyrotechnic charge and an inlet opening out in an outside face of the body; b) placing a first portion of an optical fiber in the internal passage of the body, with a second portion of the optical fiber extending beyond the inlet of the body, and a glass preform being interposed between the optical fiber and the inlet of the body; and c) applying heat treatment to the glass preform to raise the glass preform to a temperature higher than the melting point of the glass preform so as to form a hermetic sealing element made of glass between the optical fiber and the inlet of the body.

The invention relates to an electric pyrotechnic detonator comprising a pyrotechnic charge (6) comprising at least one compound component. The detonator also includes a plastic housing (1) consisting of two parts. The first part (2) comprises a plastic wall (4) integral with a bottom (5) made of plastic and constitutes a container. A second part (3) having a main axis (10) is traversed by at least two studs (11, 12) in the direction of said axis (10). The pins (11, 12) are connected together by a bridge (13) on a surface (14) of the part (3). Said surface (14) is symmetrically concave with a height H and a width L. The second part (3) constitutes an insert. The first component (2) and the second component (3) are hermetically assembled together by ultrasonic welding.

The invention relates to a glass-metal feed-through for transmitting an electrical signal from one face (31) to another face (32) that is opposite, the feed-through comprising: a glass plug (3) ; two metal pins (4, 5) passing through the plug (3) ; and a metal part (2) surrounding the plug (3). The invention is characterized in that the feed- through includes electrically-conductive link means between a first of the pins (4, 5) and the part (2), the link means being constituted by a brazing preform (7) secured to the first pin (4) and to the part (2).