Abstract: A seat belt retractor including an energy absorbing mechanism which can reliably satisfy a requirement to absorb the energy flexibly is provided. When a first pulley is rotated clockwise by an extraction of a webbing in an emergency, a wire, which is connected to the first pulley at one end, is pulled. Thus, a second pulley, to which the other end of the wire is connected, is rotated clockwise around a second rotational shaft. The second rotational shaft is disposed at a position away from the center of the second pulley. Thus, the rotational diameter gradually increases and a torque applied by the wire for rotating the second pulley is gradually reduced. Since the second rotational shaft is connected to a torsion bar, a load applied to the torsion bar is reduced after reaching a limit load.

Abstract: A seatbelt retractor is capable of winding a seatbelt webbing on a spool driven by a spring and a motor. The seatbelt retractor includes a motor-power transmission device for controlling a motor-power transmission path to turn on and off transmission of motor power to the spool. The motor-power transmission device turns on only when the motor rotates in the belt winding direction to connect the motor-power transmission path and transmit the motor power to the spool. After a specific period of time since a buckle-releasing signal detecting release of a tongue from a buckle is received from a buckle switch, the motor control device rotates the motor in the belt winding direction. When a winding speed of the seatbelt webbing by the spring becomes less than a constant value, the motor-power transmission device is set to turn on so as to connect the motor-power transmission path.

Abstract: A seat belt retractor is formed of a reel for winding a seat belt, and a spring member connected to the reel for providing a retracting force thereto. The retracting force is weak not to provide a feeling of oppression to a passenger when the passenger has fastened the seat belt. A motor is connected to the reel for driving the reel only in a direction of retracting the seat belt to generate a retracting force greater than that of the spring member. Thus, the seat belt retractor retracts the seat belt by sufficiently great retracting force, but does not provide a feeling of oppression to the person when properly fastened.

Abstract: A motor retractor system includes a first winding device having a motor for driving a shoulder belt in a winding direction, and a second winding device having a tension-applying device for always applying a tension in a winding direction to a lap belt extending from the shoulder belt through a through-tongue. A control unit controls the motor to drive when the through-tongue coupled to the buckle is released from the buckle. Therefore, the shoulder belt can be smoothly pulled out. When the through-tongue is buckled up, an occupant can be restrained by the seat belt with a comfortable force and no slack. When the through-tongue is released from the buckle, the seat belt can be promptly withdrawn to the first winding device.

Abstract: In a seatbelt retractor having a motor, a belt winding spool, and a switching mechanism that turns on and off a power transmission route between the motor and the spool, the switching mechanism includes a device that connects the power transmission route between the motor and the spool only when the motor rotates in the retracting direction. A ratchet mechanism allows the spool to rotate only in the retraction direction during the emergency operation, while allowing the spool in any directions in the normal operation. The resultant locking mechanism can be rapidly operated upon occurrence of an emergency, while the seatbelt retractor will not cause uncomfortable feeling or unpleasantness due to unnecessary locking when an occupant tries to withdraw the seatbelt.

Abstract: In a seat belt retractor, when a collision predicting signal is generated from a collision predicting device, a motor rotates counterclockwise, and a pawl is thereby raised via a lever so as to move to a position contacting saw-blade teeth of a ratchet gear. In this state, when a rotational force is applied in the seatbelt-extraction direction, the rotation is prevented. On the other hand, the rotation in the seatbelt-retraction direction can be performed by pushing down the pawl with a diagonal portion of the saw-blade tooth of the ratchet gear.

Abstract: In a seat belt control device of the invention, when a buckle switch detects disengagement of a buckle and a tongue plate of a seat belt, the seat belt is retracted through a motor. In addition, the seat belt is re-retracted, through a motor, when a passenger detector detects that no passenger is present in an automobile, when a door switch detects that a door opens, or when an engine key switch detects that an engine key is pulled out or is in an off state. Thus, the seat belt can be positively retracted. Therefore, when a passenger gets off or is going to get off, the seat belt can be securely retracted to thereby prevent the seat belt from being caught by a projection in a compartment or by the door of the automobile.

Abstract: 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.

Abstract: A motorized seat belt retractor configured to be activated in response to a signal generated by a dangerous state detection device indicating that a vehicle is in a dangerous state. The retractor is configured so that in response to the signal the retractor operates to retract a seat belt webbing prior to a collision thereby restraining an occupant positioned in a seat in the vehicle. The retractor is activated every time a signal indicating that the vehicle is in a dangerous state is received from the detector.

Abstract: A seat belt retractor including an energy absorbing mechanism which can reliably satisfy a requirement to absorb the energy flexibly is provided. When a first pulley is rotated clockwise by an extraction of a webbing in an emergency, a wire, which is connected to the first pulley at one end, is pulled. Thus, a second pulley, to which the other end of the wire is connected, is rotated clockwise around a second rotational shaft The second rotational shaft is disposed at a position away from the center of the second pulley. Thus, the rotational diameter gradually increases and a torque applied by the wire for rotating the second pulley is gradually reduced. Since the second rotational shaft is connected to a torsion bar, a load applied to the torsion bar is reduced after reaching a limit load.

Abstract: 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.

Abstract: A motorized seat belt retractor having a load limiter to control the tensile load on a seat belt webbing, especially when the webbing is withdrawn due to an emergency condition. The load limiter controls the tension by controlling the condition of the motor that drives the retractor.

Abstract: To reduce the cost of a seat belt retractor having a function of taking up a seat belt by power a motor. A spool is fitted in a base frame such that a torsion bar functions as a shaft of the spool. Two gear-clutch casings are disposed on the left and right sides of the spool via a pretensioner and a locking mechanism, respectively, wherein two motors are disposed to the gear-clutch casings, respectively. The two motors achieve respective functions which are different from each other and rotate at respective constant speeds. Unlike a case that one motor is used and the rotation speed of the motor is controlled, a speed controller and a noise filter for the motor are not required, thereby reducing the cost of the entire device.

Abstract: In a seat belt control device of the invention, when a buckle switch detects disengagement of a buckle and a tongue plate of a seat belt, the seat belt is retracted through a motor. In addition, the seat belt is re-retracted, through a motor, when a passenger detector detects that no passenger is present in an automobile, when a door switch detects that a door opens, or when an engine key switch detects that an engine key is pulled out or is in an off state. Thus, the seat belt can be positively retracted. Therefore, when a passenger gets off or is going to get off, the seat belt can be securely retracted to thereby prevent the seat belt from being caught by a projection in a compartment or by the door of the automobile.

Abstract: A seat belt retractor of the invention is basically formed of a first reel, a second reel, a rope extending between the first reel and the second reel, and a spiral spring situated in the second reel as an urging force providing device. The first reel is connected coaxially to a rotational axis of a reel shaft for winding a webbing, and has a drum shape on which the rope fixed at one end to the first reel is wound. The second reel has a rotational shaft disposed parallel to and laterally spaced away from the first reel. The second reel includes a small diameter reel portion, a large diameter reel portion, and a transition portion connecting the small diameter reel portion and the large diameter reel portion. The rope attached to the first reel extends to the small diameter reel portion and the transition portion, and is wound around a groove of the large diameter reel portion.