Kabushiki Kaisha Tokai Rika Denki Seisakusho

Keiichi Katoh

Toshimasa Yamamoto

Tomonori Nagata

Kenji Matsui

Seiji Hori

Keisuke Imai

Yasuho Kitazawa

Seiji Nishide

Tatsuo Yamashita

A webbing take-up device which, when a webbing belt is pulled out, can reduce the rewind urging force applied to the vehicle occupant by the belt. The take-up device includes a spool for winding a webbing belt, a take-up shaft that is connected to the spool, a shaft member connected to the take-up shaft via adapters a torsion coil spring connected between a ratchet wheel and adapter another torsion coil spring connected between the adapters and a spiral spring connected to the shaft member. When the belt is pulled out and secured over an occupant, a plunger engages ratchet wheel and torsion coil spring is wound tighter on the adapter The resultant frictional force and urging force of the torsion coil spring is greater than the urging force of the spiral spring Thus, slack is present in the torsion coil spring and the adapter rotates relatively to the adapter In this way, the urging force of the spiral spring is not completely applied to the spool thus relieving the occupant of the full rewind force of spring

Webbing take-up device

A webbing winding device having a pre-tensioner for tensioning a webbing for restraining a passenger in a passenger restraining direction in an emergency deceleration of a vehicle, comprising a winding shaft to which an end of the webbing is fixed and a gear train mechanism comprising a plurality of gears arranged in such a manner that adjacent gears mesh with each other, wherein a driving gear which receives an external driving force when the pre-tensioner is actuated is driven from a starting end position to a terminating end, position which are set in advance, so as to rotate the winding shaft in a direction for retracting the webbing, and when a driving of the driving gear is completed, at least a pair of adjacent gears are separated so as to enable the winding shaft to be rotated in the direction for retracting the webbing by inertial force.

Webbing winding device

Upon a sudden deceleration of a vehicle, if an inertial body moves a predetermined amount against the urging force of a return spring, the trigger means will be released from engagement with the firing pin. Under the urging force of a spring, the firing pin is released from engagement with the trigger means, strikes and ignites a detonator so as to activate the actuator. The trigger means will not move until the inertial body has moved by the predetermined amount. Only after the inertial body has moved the predetermined amount, will the trigger means start to move suddenly and quickly. Therefore, friction at the time the inertial body engages the trigger means is kept constant. The stable operation of the sensor is thereby assured.

Mechanical sensor

Growing community of inventors

Niwa-gun, Japan

Keiichi Katoh