A webbing retractor including: a take-up shaft that can take-up a webbing that is applied to a passenger, that takes-up the webbing by being rotated in a take-up direction, and that is rotated in a pull-out direction due to the webbing being pulled-out; a restricting member that, by being operated, restricts rotation of the take-up shaft in the pull-out direction; a driving portion that, by being electrically driven, changes an operating state of the restricting member; and a control section that acquires an acceleration of any of the webbing, the passenger or a vehicle, that computes jerk related to the acceleration, and that controls the driving portion such that the restricting member operates in a case in which the acceleration exceeds a first threshold value and the jerk exceeds a second threshold value.

A webbing retractor including: a take-up shaft that can take-up a webbing that is applied to a passenger, that takes-up the webbing by being rotated in a take-up direction, and that is rotated in a pull-out direction due to the webbing being pulled-out; a restricting member that, by being operated, restricts rotation of the take-up shaft in the pull-out direction; a driving portion that, by being electrically driven, changes an operating state of the restricting member; and a control section that acquires an acceleration of any of the webbing, the passenger or a vehicle, that computes jerk related to the acceleration, and that controls the driving portion such that the restricting member operates in a case in which the acceleration exceeds a first threshold value and the jerk exceeds a second threshold value.

A webbing retractor includes a spool, a motor, a force limiter mechanism, a first rotating body, a second rotating body, a ratchet gear, a pawl body and a control section. The ratchet gear is provided at one of the first rotating body or the second rotating body. The pawl body is provided at another of the first rotating body or the second rotating body. The pawl body can engage with the ratchet gear in a case in which the first rotating body rotates toward one side, and engagement of the pawl body with the ratchet gear being cancelled in a case in which the first rotating body rotates toward another side. The control section drives the motor to rotate in reverse, such that the first rotating body rotates toward another side in a case in which a physical amount relating to load of the passenger exceeds a predetermined value during forward rotational driving.

A webbing retractor includes a spool, a motor, a force limiter mechanism, a first rotating body, a second rotating body, a ratchet gear, a pawl body and a control section. The ratchet gear is provided at one of the first rotating body or the second rotating body. The pawl body is provided at another of the first rotating body or the second rotating body. The pawl body can engage with the ratchet gear in a case in which the first rotating body rotates toward one side, and engagement of the pawl body with the ratchet gear being cancelled in a case in which the first rotating body rotates toward another side. The control section drives the motor to rotate in reverse, such that the first rotating body rotates toward another side in a case in which a physical amount relating to load of the passenger exceeds a predetermined value during forward rotational driving.

Variable behaviour control mechanism with a variety of motion characteristics, the mechanism comprising means to measure a plurality of motion characteristics and to activate systems when a threshold of the motion characteristics is reached. The mechanism described is, for example, a vehicle seat belt and the mechanism minimises or prevents unwanted activation of line extension or retraction of the seat belt. A first mechanism is described where activation occurs between at least one primary system and at least one secondary system when a combination of the sensed motion characteristics achieves a threshold. A second mechanism is described where activation occurs between at least one primary system and at least one secondary system when at least one sensed motion characteristic achieves a threshold, the threshold being modified based on at least one further motion characteristic. A method of use of the above mechanisms is also described.

Variable behaviour control mechanism with a variety of motion characteristics, the mechanism comprising means to measure a plurality of motion characteristics and to activate systems when a threshold of the motion characteristics is reached. The mechanism described is, for example, a vehicle seat belt and the mechanism minimises or prevents unwanted activation of line extension or retraction of the seat belt. A first mechanism is described where activation occurs between at least one primary system and at least one secondary system when a combination of the sensed motion characteristics achieves a threshold. A second mechanism is described where activation occurs between at least one primary system and at least one secondary system when at least one sensed motion characteristic achieves a threshold, the threshold being modified based on at least one further motion characteristic. A method of use of the above mechanisms is also described.

A serrated portion is formed on an outer peripheral portion of a lock base body of a lock base of a webbing take-up device. Furthermore, a flange portion is formed on the outer peripheral portion of the lock base body. The flange portion is disposed on a vehicle front side with respect to the serrated portion. Triangular grooves of the serrated portion are closed by the flange portion. When the lock base becomes displaced in a vehicle rearward direction and the flange portion comes into abutting contact with a leg plate of a frame, further displacement of the lock base in the vehicle rearward direction is blocked. Due to this, engagement between the serrated portion and ratchet teeth of a ratchet hole in the leg plate can be maintained.

A serrated portion is formed on an outer peripheral portion of a lock base body of a lock base of a webbing take-up device. Furthermore, a flange portion is formed on the outer peripheral portion of the lock base body. The flange portion is disposed on a vehicle front side with respect to the serrated portion. Triangular grooves of the serrated portion are closed by the flange portion. When the lock base becomes displaced in a vehicle rearward direction and the flange portion comes into abutting contact with a leg plate of a frame, further displacement of the lock base in the vehicle rearward direction is blocked. Due to this, engagement between the serrated portion and ratchet teeth of a ratchet hole in the leg plate can be maintained.

A seatbelt retractor includes a base, a spool, a cylinder, a transfer plate, and a cylinder lock. The spool is rotatably coupled to the base and has a piston portion. The cylinder is engaged with the piston portion and therewith defines a chamber. The piston portion is movable from a first position to a second position. The transfer plate is translateably disposed in the first chamber. The cylinder lock in a first condition rotatably fixes the cylinder to the base. Damping fluid is in the chamber.

A seatbelt retractor includes a base, a spool, a cylinder, a transfer plate, and a cylinder lock. The spool is rotatably coupled to the base and has a piston portion. The cylinder is engaged with the piston portion and therewith defines a chamber. The piston portion is movable from a first position to a second position. The transfer plate is translateably disposed in the first chamber. The cylinder lock in a first condition rotatably fixes the cylinder to the base. Damping fluid is in the chamber.