Takata Corporation

Kenji Osada

Hirokazu Yoshioka

Takashi Sesaki

A seat belt retractor that functions to cancel both a function of a vehicle sensor and a function of a webbing sensor on a predetermined condition with a simple structure and a small number of components. When a seat belt is fully retracted, a cam follower of a first lever comes into contact with a second cam portion of a cam plate. An actuator pressing portion of the first lever presses an actuator of a vehicle sensor to a non-operation position. The function of the vehicle sensor is thereby cancelled. Further, when an engaging claw of a second lever separates from a ratchet tooth of a ring gear, the ring gear is allowed to rotate in a seat belt withdrawing direction. Therefore, the function of the webbing sensor is cancelled.

Seat belt retractor and seat belt device using the same

[Object] To cancel both a function of a vehicle sensor and a function of a webbing sensor at a predetermined condition while having a simple structure and a fewer number of parts. [Solution] When fully retracting a seat belt, a cam followerabuts against a first cam portion; accordingly, an actuator holding portionurges an actuatorin a non-operable position and a function of a vehicle sensoris canceled. When a large load is applied to the actuator holding portionwhile in the above canceled state, the load is supported by the first cam portion; accordingly, first and second leversanddo not pivot and cancellation of the function of the vehicle sensoris prevented from being canceled. Furthermore, when a lock clawis separated from a ratchet tooth, a ring gearbecomes rotatable and a function of a webbing sensoris canceled.

Seat belt retractor and seat belt apparatus employing seat belt retractor

During an emergency, in one form of a retractor having a spool, external teeth of a pawl provided at a spool right side end are made to mesh with some of internal teeth provided on a frame, and, with load acting on a seat belt, a spool left side end is brought into contact with a spool pushing portion. Since the spool left side end tends to be moved further in a direction of seat belt load with the load acting on the seat belt, the spool pushing portion pushes the spool left side end, whereby some of external teeth come into contact with internal teeth provided on the frame and fit deeply into gaps between adjacent ones of the internal teeth. Thus, some of the external teeth of the spool effectively come into mesh with the respective internal teeth of the frame with a simple movement of the spool.

Seat belt retractor and seat belt apparatus including the same

A seat belt retractor is provided that realizes the proper meshing between a plurality of internal teeth and external teeth with a simple movement of a spool. In the case of an emergency, external teeth of a pawl provided at a spool right side end mesh with internal teeth provided on a frame, and, with load acting on a seat belt, a spool left side end contacts a spool guide. Since the spool left side end tends to move further in the direction of seat belt load, the spool guide brings one external tooth at the spool left side end into contact with one target internal tooth provided on the frame. Hence, some of the spool external teeth are made to mesh properly with the respective internal teeth. Thus, some of the spool external teeth effectively mesh with the respective frame internal teeth with simple movement of the spool.

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Tokyo, Japan

Kenji Osada