Takata Corporation

Taktaka Corporation

Joji Mishina

Yasushi Kanamori

Masahiro Shiotani

Yasushi Masuda

Atsuyuki Uchiyama

Hiromasa Tanji

Ryosuke Nakanishi

Hiroki Takehara

Hikaru Kameyoshi

Muneo Nishizawa

Isamu Mizuno

Ryosuki Nakanishi

A seat belt retractor which achieves stable performance of a pretensioner. The seat belt retractor includes a spool for winding up a belt thereon. The spool has a shaft portion, a spool gear, and a spring-biased shaft projection which are disposed to project from a face of the spool. A spool bearing (or ring-like collar) is fitted around the shaft portion of the spool. The spool bearing is made of a material having high hardness and high rigidity such as SUS or SC. By this spool bearing, the spool is prevented from being directly subjected to load, like a bearing.

Seat belt retractor

A seat belt retractor configured to prevent the occurrence of backlash between the torsion bar and a member to which the same is fitted even when a force is applied to the torsion bar when rotation of the retractor is locked. Backlash preventing ribs are provided on the inner peripheral surfaces of the axial hole of the reel on the sides which not subject to a large force between the reel and the torsion bar. Therefore, since a large force generated when rotation of the locking base of the locking mechanism in the webbing unwinding direction is locked is not applied to these backlash preventing ribs the collapse of the backlash preventing ribs caused by such a force can be prevented.

Seatbelt retractor

A seat belt retractor including a torsion bar is provided. A second torque transmitting portion of the torsion bar is clamped between a reel and a holder member press-fitted radially in the reel without backlash in the axial direction. A first torque transmitting portion is strictly fixed to a pawl holder without backlash in the axial direction by radially crimping an internal periphery of a left end portion of the pawl holder of a locking means. Therefore, the first and second torque transmitting portions conventionally formed in a torsion bar are effectively used, thereby eliminating a groove for an E-ring as conventionally used and thus simplifying the configuration of the torsion bar. In addition, since the first and second torque transmitting portions can operate without backlash, the occurrence of jarring noise due to vibrations of the seat belt retractor can be prevented.

A seat belt retractor having a structure preventing a gear or pinion having external teeth from being improperly assembled to a spool gear. The pinion includes concave portions on its inner periphery and the spool gear includes corresponding convex portions on its outer periphery. The concave and convex portions are configured to be fit together may be inclined in the circumferential direction and thus have no symmetrical plane. If during assembly the pinion is positioned adjacent the spool gear with the wrong side out, the pinion and the spool gear would not fit together and the mistake would be noticed and, therefore, prevented.

A protective cushion or airbag for a vehicle occupant's head which can introduce gas into chambers simultaneously or with desired time lags among the chambers. A cushion comprises an occupant-side sheet and an body-side sheet which are superposed on each other and sewn together so as to form vacant chambers between the sheets. A cylindrical member is disposed between upper portions of the sheets. Gas supplied through a rear end of the cylindrical member is introduced into the chambers openings and a front end of the cylindrical member.

Protective cushion for vehicle occupant's head

A seat belt retractor with a torsion bar which can receive a large torque and can be easily formed by forging is provided. A reel assembly of the seat belt retractor includes a reel, a torsion bar, and a locking member. A first connection part of the torsion bar non-rotatably couples with concavities of a locking base of the locking member. A second connection part non-rotatably couples with concavities of the reel. The outer peripheries of the connection parts and are torx-shaped having a plurality of concavities and convexities formed in a wave-shape. A ratio R /R of the distance between the tops of the wave-shaped convexities of the connection parts and the axial center of the torsion bar (radius R ) to the distance between the bottoms of the concavities and the axial center of the torsion bar (radius R ) is set to 1.2 to 1.3.

To provide a torsion bar for the use of a seat belt retractor which can be manufactured without a spheroidizing annealing process. A torsion bar to be used as a load limiter in a seat belt retractor is characterized in that the torsion bar is made of steel of which the carbon content is 0.04% or less.

Torsion bar for seat belt retractor

To provide a pretensioner with further improved safety of the device, wherein gas is appropriately allowed to escape in the event that the gas pressure within the pipe rises excessively. A pretensioner is attached to the outer side of the frame of a seatbelt retractor. A pressure container is connected to the base portion of a pipe of the pretensioner. A gas generator is stored within this pressure container. Multiple balls are provided within the pipe. A hole is opened in the side wall of the pipe at the portion positioned between the gas generator and ball. A rivet or other device is driven into this hole. The rivet breaks in the event that internal pressure exceeding a certain pressure (i.e., abnormal pressure) is applied to the pipe, and falls loose from the hole. Alternative embodiments of gas escape mechanisms are provided.

Pretensioner with gas escape mechanism

To provide a pretensioner with improved safety, wherein gas is allowed to escape appropriately in the event that the internal gas pressure rises excessively, and there are no adverse effects on other equipment. A pretensioner is provided with a pipe and multiple balls are provided within the pipe. The balls are metal spheres such as aluminum and the ball nearest the gas generator is formed of a suitable material such as a resin of silicone rubber. A hole is bored in the resin ball in the longitudinal direction of the pipe. The hole is plugged off at the side of the gas generator and is opened on the side of the ball. A through hole perforating the next ball to the resin ball is bored in the longitudinal direction. A rod-shaped piston is stored between the hole of the resin ball and the hole of the next ball. When abnormal pressure is generated, the resin ball breaks and the gas pressure is placed directly on the piston. The abnormal pressure is thereby provided a pathway to dissipate in the direction of the balls'movement.

To improve the strength in the connection between an inflator and an airbag, an area around a gas inlet,of an airbag,is fitted onto an inflator,and is bound tightly by two bands,The areas of the airbag,near the bands,are provided with stitches,extending in the circumferential direction of the inflator,The stitches,rise from the outer surface of the airbag,The areas around the gas inlet of the airbag,and the inflator,are held by saddle bands,of a holder,The stitches,are caught by the bands,when the airbag,is inflated and the airbag,is about to be slipped off, thereby securely preventing the detachment of the airbag

Growing community of inventors

Tokyo, Japan

Joji Mishina