Abstract: An airbag is folded by attaching a line located inside the airbag to a front side an airbag and extending the line across a guide. The airbag is then compacted around the guide and the line. The line is then placed in communication with a sensor. The line may be a flexible element having an optical pattern read by the sensor. During the folding process, the line may be reeled into a sensor housing.

Abstract: New and useful constructions for an airbag cover and housing, and new and useful assembly technique for coupling the airbag housing and cover to form an airbag module, are provided. According to the present invention an airbag cover and housing are configured so that the cover is tightly fit over the housing as the cover is coupled to the housing. The housing has an array of hooks and retainers, each formed in one piece with the housing. The hooks and retainers are oriented toward each other and are configured to: (a) enable the cover to be tightly fit over the housing; (b) capture a portion of the cover between the hooks and the retainers; (c) prevent over travel of the cover during coupling of the cover with the housing; and (d) retain the cover securely coupled to the housing during deployment of an airbag from the module. Additionally, the configuration of the housing provides flexibility in the manner in which the housing can be formed, because it enables the housing to be formed e.g.

Abstract: An algorithm for evaluating information from sensors interacting with strips that are extended during activation of the airbag determines whether the airbag has contacted an out-of-position occupant. In one embodiment, each strip includes an alternating pattern that generates a frequency in a sensor through which the strip passes during deployment. The frequency generated is based upon the speed with which the strip passes by the sensor and, in turn, the speed of deployment of the airbag. A controller evaluates the frequency and the changes in frequency from the sensor during deployment. Depending upon the specific configuration of the system and the specific vehicle, a decrease in the speed of deployment of the airbag may be indicated by a decrease in the frequency of the signal.

Abstract: A vehicle seat that is removable from a vehicle has an automatic buckle release mechanism. The vehicle seat has a seat base and a seat back. To prepare the seat for removal from the vehicle the seat back is pivoted about an axis towards the seat base. The seat base has a seat belt buckle attached thereto. The seat belt buckle has a release mechanism for releasing from the seat belt buckle a buckle tongue that is assembled with a seat belt webbing. The seat back has an actuator arm attached thereto that pivots with the seat back. The actuator arm causes the release mechanism of the seat belt buckle to operate in a buckle tongue releasing manner when the seat back is pivoted towards the seat base.

Abstract: A pyrotechnic side impact inflator is provided for inflating a side airbag in an automobile. The inflator has a few number of physical components and has a tubular shape. The inflator has an igniter that directly ignites the main gas generant in the inflator. The burning of the gas generant produces combustion products or inflation gas that is utilized to inflate a folded airbag. The inflation gas travels in a tortuous path in the inflator, which reduces the kinetic energy associated with the gas molecules thereby cooling the inflation gas.

Abstract: A switch has a unitary plastic body that can be formed by injection moulding or extrusion. The body has a base that holds a magnetic field sensor. The base is fastened to a support structure by a plurality of fasteners. The base is connected to an arm by an elastic U-shaped portion of the plastic body that acts as both a hinge and a biasing member. The arm positions an activation magnet over the base and the sensor. The arm does not block access to fasteners that mount the switch to the support structure.

Abstract: A side-mounted float sensor has eight components: a reed switch, two leads, a molded connector, a sensor body, a sealing grommet, a float, and an activation magnet. The two leads are assembled to the molded connector and the reed switch is welded across the leads. The molded connector is inserted into the sensor body. The sensor body has an opening that receives a portion of the float. The float is keyed to the sensor body and a flange extends from the sensor body so that the float can only be installed on one side of the sensor body. The float rests on an upper portion of the sensor body and is completely contained behind a circular disk which terminates the sensor body and guides the sensor body during insertion through the sealing grommet.

Abstract: An airbag deployment sensor has a cartridge containing a quantity of tape one end of which is attached to the inside surface of an airbag cushion. Deployment of the cushion pulls tape from the cartridge at a rate that is monitored by transmitting light through the tape, or by detecting the presence of metalized, or magnetic shielding portions, of the tape.

Abstract: An inflator for inflating an airbag has a housing with a first housing portion defining a first chamber and a second housing portion defining a second chamber. A gas generant disposed in the first and second chambers. A barrier separates the first and second chambers. Each of the chambers has an ignition enhancer tube disposed therein with a portion of an ignition unit being located therein. Each of the ignition enhancer tubes has at least one outlet defined therein. Each ignition enhancer tube holding an ignition enhancer such that when the associated ignition unit ignites the ignition enhancer combusts and exits through said outlet and then reacts with the gas generant in the associated chamber.

Abstract: A non azide gas generant composition of nitroguanidine and an oxidizer such as phase stabilized ammonium nitrate is provided. A gas generant having nitroguanidine and phase stabilized ammonium nitrate has many desirable characteristics such as little production of ash and the production of essentially toxic free exhaust gas. When nitroguanidine is compressed into a pellet it has needle shaped crystals that bend or distort. When the gas generant pellets are subjected to thermal cycling some nitroguanidine crystals will return to their native conformation resulting in pellet growth. To eliminate this pellet growth, nitroguanidine is passed through a vibrating ball mill. The media in the vibrating ball mill pulverizes the nitroguanidine into an amorphous crumb.

Abstract: A vehicle occupant safety system includes a crash severity determination system and one or more vehicle occupant safety devices. The crash severity determination system includes at least one crash sensor which generates a crash signal based upon the severity of the crash. A continuously variable crash severity output signal is generated based upon the crash signal from the crash sensor. Generally, for a given crash type, the crash severity signal is inversely proportional to the amount of time between the beginning of the crash and when the crash signal crosses a threshold. This continuously variable crash severity signal is sent to the vehicle occupant safety devices, which activate proportionally to the crash severity signal.

Abstract: A dual stage inflator is disclosed in the present invention. The dual stage inflator comprises a diffuser subassembly and a gas generator subassembly. Also disclosed is a multiple stage inflator, which comprises a diffuser subassembly, a first gas generator subassembly, and a second gas generator subassembly. Both the dual stage inflator and the multiple stage inflator have numerous output characteristics or output profiles associated therewith to protect different size and position vehicle occupants. The dual stage inflator and the multiple stage inflator release either stored gas or stored gas mixed with combustion gaseous products from the burning of gas generant.

Abstract: A vehicle safety system uses sensors mounted between a seat belt frame and a seat belt spool to detect protraction of seat belt webbing after the seat belt spool has been locked by an inertial switch or the like. The vehicle safety system gathers information from vehicle mounted crash sensors. If the vehicle safety system determines that a crash is taking place, but does not receive an output from the sensor mounted between the seat belt frame and the seat belt spool indicating seat belt webbing is being protracted, the system deploys other safety apparatus based on the assumption that the occupant of a particular seat is not properly restrained by one or more seat belts. For example seat belt use information can be used to vary the level of airbag deployment in a variable deployment airbag. An alternative embodiment detects motion of a linear energy-absorbing mechanism.

Abstract: An air bag module comprises an air bag having an interior cavity. The air bag has an air bag opening in communication with the interior cavity. The air bag module has an air bag inflator with an outlet for inflating the air bag. At least one vane extends from the air bag opening into the interior cavity of the air bag.

Abstract: An airbag module utilizes tape dispensing cartridges. A tape end extends from each cartridge to the inside surface of an airbag. As the airbag inflates, tape is drawn from the tape cartridges as the tapes are drawn along with the deploying airbag. The rate at which tape is withdrawn from the cartridges is measured by sensible indicia of a magnetic or optical nature positioned on the tape and drawn past a sensor contained within the tape cartridge. The markings on the tape can be nonuniform along the length of the tape. The tape storage area outlet and the cartridge outlet are each formed by two relatively large radius corners. The tape is sealed to the cartridge to prevent the ingress of contaminants. As the airbag withdraws tape from the cartridges, the seals are unseated.

Abstract: A vehicle occupant position sensor is mounted on the front of an airbag which is deployed toward a vehicle occupant. The sensor comprises a capacitance sensor constructed by rendering portions of the airbag which face the vehicle occupant conductive. The airbag on which the sensor is placed is also constructed to allow venting of the airbag before it is fully deployed. The distance between the sensor and the vehicle occupant is continually determined with respect to the sensor. The output of the capacitive sensor is processed by a control system and is used to predict the interaction between the airbag and the vehicle passenger and to cause the airbag to be vented if that interaction is predicted to be more harmful than beneficial to the vehicle occupant. A system which prevents airbag venting once the airbag is inflated or nearly inflated can also be employed.

Abstract: An improved force-measurement system utilizes active magnetostrictive sensors for generating a signal representative of a force, such as the weight of a person or thing on a seat within a motor vehicle, or the force applied to the horn sensor switch on a vehicle steering wheel. The active magnetostrictive sensor includes an excitation coil and a detection coil.

Abstract: An energy management device has a plurality of electromagnets positioned between a shaft and a seatbelt spool. When energized, the electromagnets move radially outwardly to engage the inside surface of a hub of the seatbelt spool. By adjusting the amount of current supplied to the electromagnets, the amount of friction, and thus the amount of energy dissipated, can be controlled. A D-ring can be supported on the cable which goes to a spool so that during a crash the ring moves forward as cable is pulled out of the spool which in turn is braked by the energy management device.

Abstract: A D-ring assembly comprising a D-ring and a load limiting device. The D-ring has a slot therethrough for receiving a seatbelt webbing and for guiding the webbing from the retractor to the torso of a vehicle occupant. The load limiting device functions by absorbing kinetic energy of the vehicle occupant during a crash to control the deceleration forces experienced by the vehicle occupant. The load limiting device has a deforming member partially embedded in a swivel ball. When a predetermined amount of force is applied on the D-ring assembly, the swivel ball rotates causing the deforming member to create a channel in the load-limiting device.

Abstract: A device for measuring a belt force acting upon a vehicle seat belt has at least one spring that is connected indirectly to a bearing member of the belt buckle that can be secured to the vehicle structure. A measuring element is connected to the spring, and can be connected to the seat belt and is movably mounted against a bias of the at least one spring proportionally to the belt force, whereby the measuring element is guided by means of a low friction guide means in a predetermined direction.