Abstract: A seat belt tensioner includes a wire, a spring retainer connected to a seat belt buckle by the wire, a casing within which the spring retainer is linearly movable, a primary coil spring contacting the spring retainer, a leaf spring for limiting movement of the spring retainer, a secondary coil spring, and a mass body supported relative to the spring retainer through the secondary coil spring in the direction in which an inertial force is applied. The mass body is moved against the action of the secondary coil spring when a predetermined deceleration is applied, the mass body slides and the primary coil spring is released.

Abstract: An arresting hook plate extending from a seatbelt buckle is attached to a buckle plate so that it moves freely along a straight line. When inertia force acts on the mass body inside a pull-in section casing, it leaves a lock state and is caused to move by the spring biasing force. The arresting hook plate attached to the mass body by a wire is caused to be pulled in along with movement of the mass body. A pair of locking pawls included on the buckle plate prevent movement of the arresting hook plate in a pull-out direction when they are in a locked position. There is also an locking pawl holder which is used to select and set the locking or release of the locking pawls. If the locking of the locking pawls is released so that the mass body is returned to the origin position against the spring biasing force by means of the arresting hook plate via the wire, the mass body is placed again in a lock state due to the retainer.

Abstract: A tensioning device is provided to realize compactness and simplification of device structure and causes mountability to be improved. A tensioning mechanism to rapidly tension one end of an interconnecting member when deceleration of a vehicle is applied, a reversing-prevention hook plate supported rotatably freely on an arm plate, a buckle joined freely rotatably at a position most proximate to a seat belt in a direction of tension action of the seat belt within a plate surface of the reversing-prevention hook plate, and a reversing-prevention claw to restrict reverse rotation of the reversing-prevention hook plate after the interconnecting member has been pulled out are provided, and a base end of the foregoing arm plate is joined freely rotatably to a frame member.

Abstract: A tire pressure detecting portion includes a housing, provided within the tire, within which a piezoelectric element is provided so as to be deformed by the tire pressure. The capacitance of said piezoelectric element is changed in accordance with its deformation. The piezoelectric element is electrically connected with a first coil diposed within said tire. The first coil is electromagnetically coupled with an excitation coil and a receiving coil, both of which are provided in the vehicle. The excitation coil provides an excitation voltage whole frequency is changed within a predetermined range including a resonant frequency. When the received voltage has the resonant frequency, a correspondinq tire pressure is determined based on a data map showing the relationship between said resonant frequency and the tire pressure.