Patent ID: 6305633
Filing Date: 2001-10-23
Classification: B60R

Abstract:
A webbing take-up device comprising a frame supported at the side of a vehicle body, a winding shaft rotatably supported by the frame and taking up a vehicle occupant-restraining webbing, and locking mechanism for preventing rotation of the winding shaft in a direction in which the webbing is pulled out at the time of sudden deceleration of a vehicle, said locking mechanism including:a first lock portion disposed coaxially with the winding shaft and rotating by following the winding shaft, said first lock portion being prevented from rotating in a direction in which the webbing is pulled out at the time of sudden deceleration of the vehicle;a second lock portion disposed coaxially with the winding shaft and rotating integrally with the winding shaft, said second lock portion causing relative rotation between said first lock portion and said second lock portion when rotation of said first lock portion in the direction in which the webbing is pulled out is prevented;a third lock portion which is held by said second lock portion in such a manner as to be movable in a first direction, and when the relative rotation between said first and second lock portions is caused, which moves in the first direction, said third lock portion being comprised of a single component having lock teeth;a fourth lock portion provided in the frame and having lock teeth which are engaged with the lock teeth of said third lock portion when said third lock portion moves in the first direction; anda guide portion which, when the lock teeth of said third lock portion is engaged with the lock teeth of said fourth lock portion, utilizes reaction force generated by engagement between the lock teeth of said fourth lock portion and the lock teeth of said third lock portion so as to displace a predetermined portion of said second lock portion in a direction in which said second lock portion moves close to a predetermined portion of said fourth lock portion, thereby allowing engagement between the predetermined portion of said second lock portion and the predetermined portion of said fourth lock portion,wherein the first direction is that in which the lock teeth of said third lock portion moves close to the lock teeth of said fourth lock portion,said guide portion including a deformable bearing portion for supporting said second lock portion, and when said bearing portion deforms due to the reaction force, said guide portion allows the predetermined portion of said second lock portion to be engaged with the predetermined portion of said fourth lock portion.