A vehicle pop-up hood device actuator includes a main body section; a cylinder that covers a portion on one axial direction side of the main body section, that is moved toward the one axial direction side of the main body section by generated gas to lift a hood of a vehicle to a lifted position, and that is configured so as to be capable of moving to a retention position; a sealing member that is formed in a ring shape and that forms a seal between the main body section and a general face; a retention member that abuts on an inner peripheral face of the cylinder and retains the cylinder at the retention position; and an enlarged diameter face that is disposed at a radial direction outer side of the main body section with respect to the sealing member at the lifted position.

A vehicle pop-up hood device actuator includes a main body section; a cylinder that covers a portion on one axial direction side of the main body section, that is moved toward the one axial direction side of the main body section by generated gas to lift a hood of a vehicle to a lifted position, and that is configured so as to be capable of moving to a retention position; a sealing member that is formed in a ring shape and that forms a seal between the main body section and a general face; a retention member that abuts on an inner peripheral face of the cylinder and retains the cylinder at the retention position; and an enlarged diameter face that is disposed at a radial direction outer side of the main body section with respect to the sealing member at the lifted position.

An actuator, especially for a vehicle protection system, comprises at least one wire (14) variable in shape depending on temperature made from a shape memory alloy and an elongate pyrotechnical element (12) connected to the shape-variable wire (14) so that upon ignition of the pyrotechnical element (12) the wire (14) is heated and experiences a change of length. The vehicle protection system is, for example, an airbag system comprising an airbag and a regulating mechanism for the internal airbag pressure, wherein the wire (14) of the actuator (10) is connected to the regulating mechanism so that a change of shape of the wire (14) exerts a force on the regulating mechanism.

An actuator, especially for a vehicle protection system, comprises at least one wire (14) variable in shape depending on temperature made from a shape memory alloy and an elongate pyrotechnical element (12) connected to the shape-variable wire (14) so that upon ignition of the pyrotechnical element (12) the wire (14) is heated and experiences a change of length. The vehicle protection system is, for example, an airbag system comprising an airbag and a regulating mechanism for the internal airbag pressure, wherein the wire (14) of the actuator (10) is connected to the regulating mechanism so that a change of shape of the wire (14) exerts a force on the regulating mechanism.

A gas generator is provided that contains a housing containing a base and a cap fixed to the base; a divider separating the housing into a first combustion chamber and a second combustion chamber, wherein the divider prevents sympathetic actuation of the second combustion chamber when the first combustion chamber is actuated; and an inner wall within the housing, the divider slidably engaged with the inner wall upon actuation of the first and second combustion chambers. Accordingly, a valve assembly of the present invention generally contains a movable divider that substantially seals an enclosure thereby defining a secondary combustion chamber within the gas generator.

A gas generator is provided that contains a housing containing a base and a cap fixed to the base; a divider separating the housing into a first combustion chamber and a second combustion chamber, wherein the divider prevents sympathetic actuation of the second combustion chamber when the first combustion chamber is actuated; and an inner wall within the housing, the divider slidably engaged with the inner wall upon actuation of the first and second combustion chambers. Accordingly, a valve assembly of the present invention generally contains a movable divider that substantially seals an enclosure thereby defining a secondary combustion chamber within the gas generator.

A gas generator includes a housing main body made of metal, a holder assembly, and an igniter. The holder assembly includes a holder portion made of metal and a connector portion made of resin. The holder portion includes a first barrel portion and an annular projection. The connector portion includes a second barrel portion and a cylindrical portion. The cylindrical portion is inserted in the housing main body and externally attached to the first barrel portion. As a portion of the housing main body corresponding to the cylindrical portion is decreased in diameter, the cylindrical portion is compressed by being sandwiched between the portion of the housing main body decreased in diameter and the first barrel portion so as to seal a gap between the housing main body and the first barrel portion.

A gas generator includes a housing main body made of metal, a holder assembly, and an igniter. The holder assembly includes a holder portion made of metal and a connector portion made of resin. The holder portion includes a first barrel portion and an annular projection. The connector portion includes a second barrel portion and a cylindrical portion. The cylindrical portion is inserted in the housing main body and externally attached to the first barrel portion. As a portion of the housing main body corresponding to the cylindrical portion is decreased in diameter, the cylindrical portion is compressed by being sandwiched between the portion of the housing main body decreased in diameter and the first barrel portion so as to seal a gap between the housing main body and the first barrel portion.

To provide an extinguishant composition that can be used as an extinguishant in the event of a fire, and an aerosol-generating automatic fire-extinguishing device in which the extinguishant is used. An extinguishant composition and an aerosol-generating automatic fire extinguishing device containing the extinguishant composition, said composition being characterized in containing 20-50% by mass of a fuel and 80-50% by mass of a chlorate, and further containing 6-1000 parts by mass of a potassium salt in relation to a total of 100 parts by mass of the fuel and the chlorate, the extinguishant composition having a thermal decomposition starting temperature in the range of over 90 C. to 260 C.

To provide an extinguishant composition that can be used as an extinguishant in the event of a fire, and an aerosol-generating automatic fire-extinguishing device in which the extinguishant is used. An extinguishant composition and an aerosol-generating automatic fire extinguishing device containing the extinguishant composition, said composition being characterized in containing 20-50% by mass of a fuel and 80-50% by mass of a chlorate, and further containing 6-1000 parts by mass of a potassium salt in relation to a total of 100 parts by mass of the fuel and the chlorate, the extinguishant composition having a thermal decomposition starting temperature in the range of over 90 C. to 260 C.