Abstract: In a seat belt retractor according to the present invention, a lock gear first cover 13 has a projection 13a formed in a relatively large ring shape. The projection 13a has teeth 13c formed all around the inner surface thereof at same intervals. These teeth 13c are formed to have the same positional relation with the teeth 2 f formed on the right-hand side wall 2a. Further the number of the teeth 13c is set to be a common divisor of the number of the teeth 2f, that is to be less than the number of the teeth 2f. Thereby, the frequency of occurrence of end lock decreases.

Abstract: A seat belt retractor having a reel shaft that performs relative rotation in the unwinding direction, where teeth of a main pawl approach teeth of a side wall of the seat belt retractor by a set amount, but the teeth of the main pawl do not approach the teeth of the side wall any further. When the reel shaft further rotates in the unwinding direction, a tooth of the main pawl comes into contact with the steep slope of a tooth of the side wall. Thus, the main pawl reaches a standby position. When the reel shaft further rotates in the unwinding direction, the tip of the tooth of the main pawl is guided toward the bottom tooth of the side wall by the steep slope of the tooth of the side wall, so that the teeth of the main pawl completely engage with the teeth of the side wall. Thus, the main pawl reaches a lock position or, in other words, the main pawl performs a self-lock action.

Abstract: When deceleration in excess of a predetermined value acts upon a vehicle and/or when a seat belt is pulled at an acceleration in excess of a predetermined value, lock actuating means sets a state in which a first engaging member supported on a reel shaft is capable of engaging a first engaged portion of a frame, thenceforth sets a state in which a second engaging member supported on the reel shaft is capable of engaging a second engaged portion of the frame, and then engages the first engaged portion an the first engaging member as Well as the second engaged portion and the second engaging member. As a result, engagement between the first engaged portion and the first engaging member and between the second engaged portion and the second engaging member is performed in reliable fashion. Accordingly, the reel shaft is assuredly locked against turning at both its ends in the seat belt pulling direction.

Abstract: A seat belt retractor having a webbing guide (22) which slides along guide holes (2p and 2q) in side walls (2a and 2b) in accordance with the roll diameter of a webbing (3) taken up on a reel shaft (4), thereby allowing the webbing (3) to be wound up and unwound smoothly and also protected. Since guide portions (22d and 22e) abut on the upper end surfaces of the two side walls (2a and 2b) at all times, the webbing guide (22) will not rotate to tilt when the webbing (3) is wound up and unwound. Accordingly, the webbing guide (22) can slide smoothly along the guide holes (2p and 2q), and the webbing (3) can be wound up and unwound even more smoothly.

Abstract: A seat belt retractor having a main pawl (17) which is rotatably fitted in a fourth recess (4n) provided in a reel shaft (4). In this state, a load transfer portion (17e) abuts on a load bearing surface (4j) of the reel shaft (4). Since the load transfer portion (17e) abuts on the load bearing surface (4j) of the reel shaft (4), a load (w) applied to a pawl portion (17c) of the main pawl (17) is transferred from the load transfer portion (17e) to the load bearing surface (4j) and borne by the reel shaft (4). Since teeth (17d), which serve as a point of application of load, and the load transfer portion (17e) are relatively close to each other, the main pawl (17) is subjected to only compressive force substantially. Moreover, since the load transfer portion (17e) and the load bearing surface (4j) are in plane contact with each other and hence the load is transferred to the reel shaft (4) while being dispersed over a wide area, the stress produced therein is relatively small.

Abstract: An inertia member (15) of a webbing sensor is set so that when it abuts on a first stopper (14h), the center of gravity (G) of the inertia member (15) lies at a position which is on an extension of an imaginary line (.gamma.) connecting the center of a first rotating shaft (4d) of a reel shaft (4) and the center of a shaft (14f) of a lock gear (14) at a side thereof closer to the shaft (14f) and which is a little apart from the shaft (14f). Thus, when the lock gear (14) rotates as the webbing (3) is unwound or wound up under normal circumstances, centrifugal force acts on the center of gravity of the inertia member (15), but since the line of action of the centrifugal force lies on the line (.gamma.), the inertia member (15) is not subjected to moment about the shaft (14f) by the centrifugal force. Therefore, there is no possibility of the inertia member ( 15) rotating about the shaft (14f) under normal circumstances.

Abstract: In the seat belt retractor of the invention, the main pawl 17 turns into engagement with the teeth 23a of the lock ring 23, so that the rotational force of the reel shaft in the webbing unwinding direction is transmitted to the lock ring 23 to turn it in the same direction . This rotation of the lock ring 23 is transmitted to the clamp member 26 through the arm 24 to turn the clamp member 26. As a result, the webbing 3 is fastened between the clamp member 26 and the force-bearing member 27, so that the webbing 3 can be locked against further unwinding. This makes it possible to incorporate clamp means to even a frame lock type of seat belt retractor, and improves the reliability of part engagement much more.

Abstract: In a seat belt retractor according to the present invention, a first protruding shaft of a reel shaft is loosely fitted into a recess, which is formed in an end of an output shaft, in such a manner that there is a prescribed gap between the shaft and the inner wall of the recess. The output shaft and the reel shaft are loosely fitted together so as to be capable of moving relative to each other in the axial direction but incapable of rotating relative to each other in the rotational direction. Accordingly, the reel shaft is capable of pivoting about the end of the first protruding shaft, which is the loosely fitted end. When the reel shaft pivots in this manner, the teeth of a ratchet on one side engage with teeth formed on a wall on the same side.

Abstract: A deceleration sensing member (7) includes a casing (7a), a lever (7b) having a pawl, and an inertia member (7c) that tilts to a two-dot chain position when deceleration exceeding a predetermined value acts on the vehicle. The bottom of the inertia member (7c) is formed in the shape of a small-mass portion (7j), while the top of the inertia member (7c) is formed in the shape of a large-mass portion (7k), so that the center of gravity of the inertia member (7c) lies at a relatively high position. Further, an actuating projection (7m) is formed on the large-mass portion (7k). Thus, it is possible to obtain a relatively large pivoting stroke of the actuator with a relatively small angle of inclination of the inertia member (7c). The deceleration sensing member (7) can be attached without play by longitudinally press-fitting engagement ridges (7g and 7h) into respective recesses (13j and 13k ).

Abstract: A device for maintaining a biasing state of a biasing force application means used in a seat belt retractor. The inner end (8a) of a power spring (8) of the biasing force application means (5) is retained by a bush (9), and the outer end (8b) of the power spring (8) is retained by a retaining portion (10d) of a spring casing (10). In a state where the biasing force application means (5) is formed as a subassembly and the power spring (8) has been wound up by a predetermined amount in a direction in which a webbing (3) is unwound, a spring pin (12) is attached to the subassembly so that a pair of rotation preventing arms (12a) and (12b) of the spring pin (12) pierce through small holes (11b and 11c) provided in a cover (11), either of grooves (9b and 9c) and either of grooves (9 d and 9e), which are provided in the bush (9), and small holes (10b and 10c) provided in the spring casing (10), thereby enabling the power spring (8) to be readily maintained in the wound-up state.

Abstract: The seat belt retractor of the present invention is provided with a fragile portion .gamma. near a supporting section of a rotating shaft 21 on two side walls 2b (and 2a--not shown) of a case 2. The fragile portion .gamma. undergoes plastic deformation or rupture when a load exceeding a predetermined value is applied on a seat belt 1 through the rotating-squeezing member 20 and a rotating shaft 21 by pulling force. When the fragile portion .gamma. undergoes plastic deformation or rupture, the rotating-squeezing member 20 is moved toward loading direction, and the rotating-squeezing member 20 is separated from the sliding-squeezing member 19. Then, the rotating-squeezing member 20 is turned over, and the squeezing force on the seat belt 1 by the rotating-squeezing member 20 and the sliding-squeezing member 19 is alleviated. As the result, the application of highly concentrated load on the seat belt can be avoided.

Abstract: An infant-restraining protective seat includes a shoulder-belt adjusting device (6) provided on a seat back. The shoulder-belt adjusting device (6) includes a belt guide (101) for guiding shoulder belts (5a) in such a manner that the position of the shoulder belts can be adjusted up or down, supporting means (102) for supporting the belt guide (101), a vertically extending screw shaft (103) for moving the supporting means (102) up and down, an operating knob (104) turnably attached to the left side wall (33) of the seat back (3), and a torque link (105) which connects the operating knob (104) and the screw shaft (103) while producing a right-angle change in direction, and which transmits the rotational torque of the operating knob (104) to the screw shaft (103). The lower end of the screw shaft (103) is supported so as to be capable of rotating in a state in which the shaft is supported in the thrust direction by means of a lower bracket ( 37).

Abstract: A seat belt retractor comprises a frame including a pair of opposite side walls and a rear wall extending between the side walls, a seat belt take-up reel extending between the side walls of the frame, a first gripping member mounted to the rear wall of the frame to grip a seat belt, a shaft extending between the side walls of the frame, a second gripping member having a support hole at one end to receive the shaft whereby the second gripping member is pivotally supported by the frame, the second gripping member being rotated between a position where the other, free end of the second gripping member is overlapped with the first gripping member and a position remote from the first gripping member, and an operating mechanism for moving the second gripping member to overlap with the first gripping member in emergency situations of a vehicle, wherein the first gripping member is moved on the rear wall of the frame in the direction in which the second gripping member is rotated, and the frame is provided with a st

Abstract: A seat belt retractor comprises a frame including a pair of opposite side walls and a rear wall extending between the side walls, a seat belt take-up reel extending between the side walls of the frame, a first gripping member mounted to the rear wall of the frame to grip a seat belt, a shaft extending between the side walls of the frame, a second gripping member having a support hole at one end to receive the shaft whereby the second gripping member is pivotally supported by the frame, the second gripping member being rotated between a position where the other, free end of the second gripping member is overlapped with the first gripping member and a position remote from the first gripping member, and locking means for moving the second gripping member to overlap with the first gripping member in emergency situations of a vehicle, wherein the second gripping member has a front edge to contact with the seat belt faster than any other portions when the second gripping member is rotated in such a direction as to

Abstract: A seat belt retractor comprising a first emergency lock mechanism for locking a reel shaft around which a seat belt is wound and a second emergency lock mechanism for sandwiching and locking said seat belt drawn out from the reel shaft by a rotatable member which pivots on one of its ends. The rotatable member has a deformable portion which is deformed so that the distance from the center of rotation to the sandwiching face of the seat belt may be shortened.

Abstract: A seat belt retractor comprises a frame including a pair of opposite side walls and a rear wall extending between the side walls, a seat belt take-up reel extending between the side walls of the frame, a first gripping member mounted to the rear wall of the frame to grip a seat belt, a shaft extending between the side walls of the frame, a second gripping member having a support hole at one end to receive the shaft whereby the second gripping member is pivotally supported by the frame, the second gripping member rotated between a position where the other, free end of the second gripping member is overlapped with the first gripping member and a position remote from the first gripping member, operating means for moving the second gripping member to overlap with the first gripping member in emergency situations of a vehicle, a guide made of synthetic resin and mounted to the frame to guide the seat belt in a region where the seat belt is gripped between the first and second gripping members, and a metallic reinf