JPH0727967U - Retractor with clamp - Google Patents

Abstract

(57) [Abstract] [Purpose] A retractor equipped with an emergency lock mechanism that locks the rotation of the take-up shaft in the webbing pull-out direction in the event of an emergency such as a collision. The webbing clamp mechanism that is assembled to the retractor is simple. Provided is a good retractor with a clamp having a simple structure and capable of reliably preventing the webbing from being pulled out. A control means for respectively moving a clamp 6 to a first position where webbing can be pulled out and a second position where webbing can be pulled out is provided in a pole 10
Of the mounting hole 22 for swinging between the position for engaging the latch plate 4 and the position for not engaging the latch plate 4 and for movably supporting the rear end portion 10a along the concentric circle of the latch plate 4. And a clamp lever 7 for moving the clamp 6 to the first position or the second position by following the movement of the rear end 10a of the pole 10 engaged with the latch plate 4. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat belt retractor (winding device), and more particularly to an improvement of a retractor with a clamp having a clamp mechanism that directly clamps the webbing in an emergency to minimize the amount of pulling out the webbing.

[0002]

[Prior art]

 Conventionally, a seat belt device for safely holding a vehicle occupant on a seat keeps a considerable length of webbing wound around the retractor winding shaft even when a seat belt is used. Has become. Therefore, for example, even in an emergency lock type retractor having an emergency lock mechanism that physically locks the rotation of the retractor winding shaft in the webbing pull-out direction by inertial sensing means that responds to sudden acceleration, collision, or deceleration, Even if the rotation of the take-up shaft in the webbing pull-out direction is locked in an emergency, the tension applied to the webbing causes the webbing wound on the take-up shaft to be tightened. There is a problem such as a protrusion. Such extension of the webbing impairs occupant restraint performance, so it is necessary to minimize the amount of webbing pulled out from the retractor in an emergency.

Therefore, in order to minimize the amount of webbing pulled out from the retractor in an emergency as described above, various retractors with a clamp having a clump mechanism for directly sandwiching the webbing on the exit side of the retractor are available. Proposed. For example, the webbing take-up device disclosed in Japanese Utility Model Laid-Open No. 3-86868 is provided so as to be capable of engaging with a lock wheel (claw wheel) that rotates integrally with a take-up shaft around which the webbing is wound. By engaging the lock lever (claw member) with the lock wheel when the vehicle is decelerating, etc., an emergency lock mechanism that prevents rotation of the take-up shaft in the webbing draw-out direction and prevents the take-out of the webbing, and an emergency lock mechanism The webbing holding member (clamping member) that holds the webbing is provided, and the interlocking unit that transmits the engaging force of the lock lever that is engaged with the lock wheel to the webbing holding member to position it at the webbing holding position.

When the lock lever swings to the engagement position with the lock wheel during vehicle deceleration or the like, the webbing holding member is moved by the swinging rotational force of the lock lever transmitted through the interlocking device. It is swung to the webbing clamping position. Therefore, the webbing holding member tightly engages the webbing with the rear surface of the base of the retractor to prevent the webbing from being pulled out from the retractor in an emergency.

[0005]

[Problems to be solved by the device]

 However, the lock lever in the clamp mechanism as described above is pivotally supported at a substantially intermediate position so as to swing and rotate, and the lock lever is substantially sandwiched by the tip engaging portion engageable with the lock wheel with the center of rotation interposed therebetween. Since the rear end portion extending to the opposite side swings the webbing holding member to the webbing holding position, the rotation angle of the rear end portion becomes equal to the rotation angle of the front end engaging portion. That is, when the front end engaging portion is swung downward to prevent the winding shaft from rotating in the weaving pull-out direction during emergency locking, the rear end portion swings upward by the same angle. The webbing holding member is dynamically rotated and pushed up to the webbing holding position.

Therefore, when the tip engaging portion of the lock lever is engaged with the lock wheel and the rocking rotation of the lock lever stops, the rocking rotation of the rear end portion that pushes up the webbing holding member also stops. Since there is no margin in setting the swing stroke of the rear end for swinging the webbing holding member to the webbing holding position, it is easy for the stroke to become insufficient. If the stroke of the interlocking means when swinging the webbing holding member to the webbing holding position is short as described above, the webbing holding member cannot be reliably positioned at the webbing holding position, resulting in a sufficient webbing holding force. It may not be obtained.

Therefore, an object of the present invention is to solve the above problems, and to provide a retractor having an emergency lock mechanism for locking the rotation of the winding shaft in the webbing pull-out direction in an emergency such as a collision. (EN) Provided is a retractor with a clamp, which has a simple structure of a webbing clamp mechanism assembled to a tractor and which can surely prevent the webbing from being pulled out.

[0008]

[Means for Solving the Problems]

 The above object of the present invention is to wind a webbing by winding a claw member that is engaged with a claw wheel that rotates integrally with a take-up shaft around which the webbing is wound, into the claw wheel when the vehicle is emergency. A clan that has an emergency lock mechanism that can prevent rotation of the shaft in the webbing withdrawal direction, and that can prevent the webbing from being pulled out by sandwiching the webbing between the movable clamp member and the back surface of the base of the retractor. A retractor with a clamp having a pulling mechanism, wherein the clamp member is moved in a webbing holding direction to prevent a webbing from being pulled out, and a second position that allows the webbing to be pulled out, respectively. The control means for positioning makes the pawl member swingable between a position where the pawl member is engaged with the pawl wheel and a position where the pawl wheel is not engaged, and during the swinging thereof. The support member for movably supporting the portion along the concentric circle of the ratchet wheel, and the movement of the swing center portion of the pawl member engaged with the ratchet wheel to move the clamp member to the first portion. Or the interlocking means for bringing the clamp member to the second position. The swing center portion of the pawl member engaged with the ratchet wheel in the event of a vehicle emergency causes the clamp member to move to the second position. The rotating force of the ratchet wheel in the direction of pulling out the webbing against the biasing force to be moved moves along the concentric circle of the ratchet wheel, and the clamp member is positioned at the first position via the interlocking means. Achieved by a retractor with a clamp.

The interlocking means may be, for example, a retractor such that a clamp member is engaged with a swing end portion and a swing center portion of a pawl member is engaged with a cam portion formed on a swing center side. It is possible to use a lever member that is rotatably supported by the lever member.

[0010]

[Action]

 According to the above configuration of the present invention, when the emergency locking mechanism is activated, the pawl member is engaged with the pawl wheel, and the swing center portion of the pawl member is moved along the concentric circle of the pawl wheel, Following this movement, the interlocking means moves the clamp member to the first position where it is possible to prevent the webbing from being pulled out.

Therefore, the stroke of the interlocking means when moving the clamp member to the webbing holding position is independent of the meshing timing of the claw member and the ratchet wheel, and is freely set by the movement stroke of the swing center of the claw member. Can be set to. That is, it is possible to reliably move the crumpling member to the webbing holding position by giving a sufficient margin to the stroke of the interlocking means for moving the clamp member to the webbing holding position.

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2, a partial cross-sectional side view and an exploded perspective view of a retractor with a clamp shown in FIG. 1 and FIG. Then, through holes 21 are formed respectively. The substantially cylindrical spool 3 around which the webbing 26 is wound and integrally rotates with a winding shaft (not shown) is rotatably mounted in a state of being inserted through the through holes 21, and the side plates 1a and 1b. The latch plates 4, which are the ratchet wheels, are fixed to both end portions located outside the base. A well-known winding spring device (not shown) is arranged at an end of the winding shaft on the side plate 1b side, and the spool 3 is constantly biased in a direction of winding the webbing 26.

On the other hand, an emergency lock mechanism for preventing the webbing from being pulled out in an emergency is arranged at the end of the winding shaft on the side plate 1a side. This emergency lock mechanism is formed with a latch cup 13 loosely fitted to an end portion of the winding shaft on the side plate 1a side, and lock portions 12a and 12b engageable with inner teeth 13a of the latch cup 13. The lock arm 12 and the control plate 14 constitute a locking means and have a flange (not shown) fixed to the end of the winding shaft located outside the latch cup 13.

Further, on the outer side of the control plate 14, there is provided a ratchet wheel 19 which is an inertia member loosely fitted to a tapping screw 27 screwed to the winding shaft, and is provided on the outer peripheral surface thereof. Has ratchet teeth 19a oriented in the belt withdrawing direction for engaging with a sensor arm 32 of a vehicle body acceleration sensing means 30 described later. An annular friction spring 18 is slidably mounted on a mounting portion provided inside the ratchet wheel 19, and both ends of the friction spring 18 are engaged with the control plate 14. Therefore, the ratchet wheel 19 rotates integrally with the winding shaft and can be displaced relative to the winding shaft. When an emergency such as a collision occurs, tension is applied to the webbing, and when a shocking rotational force in the webbing pulling-out direction (arrow X ₁ direction) is applied to the winding shaft, the locking means locks the latch cup 13. Rotate in the direction of arrow X ₁ .

Further, a pawl 10 serving as a claw member is bridged in the mounting hole 22 formed in the side plates 1 a and 1 b in a substantially rectangular shape in the vicinity of the latch plate 4, and the pawl 10 is attached to the pawl 10. The pair of projecting locking claws 10a engage with the latch teeth 4a of the latch plate 4 to prevent the spool 3 from rotating in the webbing pull-out direction (arrow X ₁ direction). A cam portion 22a that rotatably supports the rear end portion 10b, which is the swing center portion of the locking claw 10a, is provided at the upper edge of the mounting hole 22. The portion 22a is formed in an arc shape concentric with the center of rotation of the latch plate 4, and has a cam shape that rises to the left in FIG.

Therefore, the mounting hole 22 is made swingable between a position where the locking claw 10a of the pole 10 is engaged with the ratchet tooth 4a of the latch plate 4 and a position where it is not engaged, and the swinging thereof is performed. A support means for movably supporting the central portion along the concentric circle of the latch plate 4 is constituted. The peripheral edge of the mounting hole 22 including the cam portion 22a is strengthened by burring or the like (see FIG. 2).

Further, a link member 11 is fixed to one end of the pole 10 located outside the base with respect to the side plate 1a, and an engaging projection 11a protruding from the swinging end of the link member 11 is a latch. The cup 13 is inserted into the engaging hole 13b of the engaging portion formed on the outer peripheral portion of the cup 13. Then, the pawl 10 is biased by a biasing means (not shown) in a rotation direction in which the locking claw 10a is not engaged with the latch tooth 4a. Therefore, the pole 10 biased by the biasing means and pressed against the back plate side edge of the mounting hole 22 is prevented from moving downwardly by the latch cup 13 via the link member 11. At the same time, the latch cup 13 is biased in the webbing winding direction (the direction opposite to the arrow X ₁ ).

A sensor case 31 that constitutes the vehicle body acceleration sensing means 30 is fixed to the lower portion of the side plate 1a, and a ball weight 33 that is a sensor is placed in the hollow portion and a locking protrusion 32a is provided. A sensor arm 32 has is attached so as to be swingable. A sensor cover (not shown) is arranged outside the side plate 1a that covers these emergency lock mechanisms.

A clamp mechanism is provided on the inner upper portion of the base 1 to directly hold the webbing and prevent the webbing from being pulled out. The clamp mechanism is a wedge-shaped clamp member in which a clamp tooth portion 6c for tightening and engaging the webbing 26 is formed on a flat surface portion. 6 and an upper plate 20 that is a guide member that is in sliding contact with a flat surface portion 6d opposite to the flat surface portion on which the clamp tooth portion 6c is formed.

Both ends of the upper plate 20 are fitted into through holes 24 formed in the opposing side plates 1a and 1b, and then fixed to an upper stay (not shown) which is a fixing means to move in the longitudinal direction. Is regulated, the sliding contact surface 20a for guiding the clamp 6 to the webbing tightening engagement position is closer to the lower plate 16 fixed to the base back plate 1c of the base 1 on the upper side. It is arranged so as to have an inclination angle of.

The constricting tip portion is located on the upper side, and the flat portion 6d is positioned in surface contact with the sliding contact surface 20a of the upper plate 20. The clamp tooth portion 6c of the clamp 6 is clamped by the webbing. Since it is always arranged in parallel to the surface of 26, the clamp 6 sliding along the sliding contact surface 20a of the upper plate 20 can evenly tighten and engage the webbing 26. A return spring 15 is disposed between the engaging portion 6b projecting on the rear end side of the clamp 6 and the rear end surface 20b of the upper plate 20, and the clamp 6 is not engaged with the webbing 26. We are pushing in the right direction.

Below the clamp 6, a clamp lever 7 for restricting the movement of the clamp 6 biased by the return spring 15 is arranged. The clamp lever 7 is a lever member rotatably supported by the base 1 of the retractor, and is engaged with the emergency lock mechanism as described above by engaging the pole 10 moving along the cam portion 22. Thus, interlocking means is provided for bringing the clamp 6 to the first position where the webbing can be pulled out or the second position where the webbing can be pulled out.

The clamp lever 7 is provided with a pair of plate-shaped members 7 a and 7 b formed with a cutout portion 7 f that engages with a pivot shaft 6 a provided on a side wall of the clamp 6, and the clamp lever 7 is bridged between the plate-shaped members 7 a and 7 b. The connecting portion 7c is in contact with the rear end wall, and the hole 7d is rotatably supported by the lever pin 17 inserted into the through holes 23 formed in the opposing side plates 1a and 1b. Further, a cam surface 7e is formed below the plate-like members 7a and 7b and the connecting portion 7c which come into contact with the rear end side portion which is the swing center of the pawl 10, and the cam surface 7e is formed. The clamp lever 7 is swung by following the pawl 10 moving along the cam portion 22a.

The clamp lever 7 is clamped against the urging force of the return spring 15 by being prevented from rotating downward by the pawl 10 which is prevented from moving downward by the latch cup 13. The movement of 6 is regulated. At this time, the cam surface 7e having a cam shape that is inclined downward to the left in FIG. 1 is such that the rear end 10b, which is the swing center of the pole 10, is positioned at the back plate end 22b of the cam 22a. There is.

That is, in the clamp 6, the pivot 6a is supported by the notch 7f formed on the swinging end side of the plate-shaped members 7a, 7b, and the rear end wall is supported by the upper part of the connecting portion 7c. Therefore, the clamp tooth portion 6c is held in a position where it does not engage with the webbing 26. Therefore, when the pole 10 moves upward along the cam portion 22a, the cam surface 7e is pressed and the clamp lever 7 is rotated upward. The clamp lever 7 rotated upward pushes the pivot shaft 6 a of the clamp 6 against the biasing force of the return spring 15 to slide the flat portion 6 d along the sliding contact surface 20 a of the upper plate 20. While doing so, the clamp 6 is moved in the direction in which it engages with the webbing 26. At this time, the mounting hole 22 does not interfere with the pole 10.

Therefore, the mounting hole 22 for supporting the pole 10 and the clamp lever 7 move the clamp 6 in the webbing holding direction to prevent the webbing 26 from being pulled out. A control means for arranging the second position and the second position for enabling the withdrawal of 26 is configured. Next, the operation of the retractor with a clamp will be described.

First, in normal use, as shown in FIG. 1, the rear end portion 10 b of the pole 10 that engages with the cam surface 7 e of the clamp lever 7 is attached to the mounting hole 22 by the urging force of the return spring 15. The clamp 6 is located at the end portion 22b on the back plate side, and the clamp 6 is urged by the urging force of the return spring 15 in a direction not engaged with the webbing 26. Further, since the pawl 10 is biased in a direction in which the locking pawl 10a is not engaged with the latch teeth 4a by a biasing means (not shown), the webbing 26 can be pulled out freely.

However, when the webbing 26 is tensioned in an emergency such as a collision and a rotational force in the webbing pull-out direction (arrow X ₁ direction) which is more than a predetermined impact is applied to the winding shaft, the ratchet wheel 19 is operated. Receives an inertial force and causes a rotation delay with respect to the rotation of the winding shaft in the webbing pull-out direction. Then, the locking means is actuated, and the lock arm 12 is moved in a direction in which the lock portions 12 a and 12 b are engaged with the inner teeth 13 a of the latch cup 13.

Further, when the winding shaft rotates in the webbing pull-out direction, the lock portion 12a of the lock arm 12 and the inner teeth 13a of the latch cup 13 mesh with each other as shown in FIG. The force is transmitted to the latch cup 13, and the latch cup 13 is rotated integrally with the winding shaft in the arrow X ₁ direction against the biasing force of the biasing means (not shown). Further, when the lock portion 12a is deformed due to an excessive force or the like, the lock portion 12b also meshes with the inner teeth 13a of the latch cup 13 to receive the force.

When the latch cup 13 rotates in the direction of the arrow X ₁ , the engaging hole 13b that engages with the engaging protrusion 11a causes the engaging portion 10a to move to the ratchet tooth 4a of the latch plate 4 via the link member 11. The pole 10 is biased in the engaging direction. At this time, the rear end 10b, which is the swing center of the pole 10, is positioned at the back plate end 22b of the mounting hole 22 by the urging force of the cam surface 7e and the return spring 15, as shown in FIG. The pole 10 is rotated in the direction of arrow Z with the rear end 10b located at the back plate end 22b.

As shown in FIG. 3B, when the winding shaft further rotates in the direction of arrow X _{1 with} the engaging portion 10 a of the pole 10 engaged with the latch tooth 4 a of the latch plate 4, As shown in FIG. 5, the rear end 10b of the pole 10 which receives the rotational force of the spool 3 resists the urging force of the return spring 15 acting via the clamp lever 7 from the end 22b of the back plate. It moves in the direction of the front end 22c. Therefore, the rear end 10b, which moves upward along the clamp along the cam 22a, presses the cam surface 7e to rotate the clamp lever 7 in the arrow Y direction.

Therefore, the clamp 6 supported by the cutout portion 7 f formed on the swing end side of the clamp lever 7 is immediately swung upward along the sliding contact surface 20 a of the upper plate 20. Since the sliding contact surface 20a is inclined so that the upper side is closer to the lower plate 16, the wedge-shaped clamp 6 that is swung upward against the biasing force of the return spring 15 is webbed. The webbing 26 is clamped by moving in the clamping direction (arrow W direction) and biting between the sliding contact surface 20a and the lower plate 16. Therefore, the webbing 26 is sandwiched between the clamp 6 and the lower plate 16 and is prevented from being pulled out.

That is, the swing stroke of the clamp lever 7 when the clamp 6 is moved to the webbing holding position can be freely set by the length of the cam portion 22a and the shape and length of the cam surface 7e. That is, the swing stroke of the clamp lever 7 is determined by the moving stroke of the rear end portion 10b moving along the cam portion 22a, and the engaging portion 10a of the pole 10 causes the latch tooth 4a of the latch plate 4 to move. The meshing timing associated with the above is determined by the swing stroke of the pole 10 that swings and rotates with the rear end 10b as the swing center. Therefore, the swing stroke of the clamp lever 7 has nothing to do with the timing of engagement between the pole 10 and the latch plate 4.

Therefore, without delaying the meshing timing between the pole 10 and the latch plate 4, it is possible to allow a sufficient margin for the swing stroke of the clamp lever 7 when the clamp 6 is moved to the webbing holding position. The clamp 6 can be reliably moved to the webbing clamping position. Therefore, the swing stroke of the clamp lever 7 when moving the clamp 6 to the webbing clamping position is insufficient, so that the clamp 6 cannot be reliably positioned at the webbing clamping position, and the clamp mechanism has a sufficient webbing position. There is no possibility that the clamping force will not be obtained, and the clamping mechanism can reliably prevent the webbing from being pulled out in the event of an emergency of the vehicle. The rear end 10b of the pawl 10 is in front of the cam 22a. moving upon reaching the side edge 2 2c is stopped, but you prevent rotation of the arrow X ₁ direction of the spool 3, the timing the rear side end portion 10b abuts on the front end portion 22c is The clamp tooth portion 6c is aligned with the timing which comes into contact immediately after the clamp tooth portion 6c completely bites into the webbing 26. The operation timings of the clamp 6 and the pawl 10 can be arbitrarily changed by appropriately changing the lengths and shapes of the cam portion 22a and the cam surface 7e.

Further, even when the vehicle receives a speed change more than a predetermined value in an emergency, the vehicle body acceleration sensing means 30 operates the locking means, and the clamp mechanism and the emergency locking mechanism operate as described above. When the tension applied to the webbing 26 is released, the force for holding the clamp 6 in the clamping direction is lost, and the clamp 6 is biased by the return spring 15 in the non-engaging direction with the webbing 26. The clamp mechanism is removed. At the same time, the rear end portion 10b of the pole 10 moves to the back plate end portion 22b along the cam portion 22a, and the clamp 6 returns to the initial position. When the webbing 26 is further wound, the pawl 10 is rotated in the direction opposite to the arrow Z direction by the urging force of the urging means (not shown), and the lock between the latch plate 4 and the engaging portion 10a is released. When the webbing 26 is further wound, the engagement between the lock portion 12a of the lock arm 12 and the inner teeth 13a of the latch cup 13 is released, and the latch cup 13 is provided with a biasing means (not shown) via the link member 11. By the force, it is rotated in the direction opposite to the arrow X ₁ direction and returned to the initial position, and the webbing 26 can be pulled out freely.

The clamp lever 7 which is the interlocking means and the cam portion 22a of the mounting hole 22 which is the supporting means constituting the control means in the present invention are not limited to the shapes of the above-mentioned embodiment, and various shapes are used. Of course, it is possible to change. Further, the present invention is not limited to the configuration of the emergency lock mechanism as in the above embodiment, but can be applied to a retractor with a clamp having an emergency lock mechanism having other inertial sensing means and locking means. The configuration of the car and the claw member is not limited to the configuration of the above embodiment.

Further, in the clamp mechanism according to the above-described embodiment, the webbing 26 is clamped between the lower plate 16 and the clamp 6 which is a wedge-shaped clamp member by moving the clamp 6 along the upper plate 20. However, it is also possible to use, for example, a clamp member in which a clamp is held at the swing side end of a clamp holder which is swingably supported. In this case, a cam surface is formed on the clamp holder that abuts the swing center of the claw member that moves along the concentric circle of the ratchet wheel, and the clamp holder is directly swung in the webbing clamping direction by the movement of the claw member. It should be configured as follows.

[0038]

[Effect of device]

 That is, the control means of the present invention, which moves the clamp member in the webbing holding direction to position the clamp member in the first position where the webbing can be pulled out and the second position where the webbing can be pulled out, is Support means for making the claw member swingable between a position for engaging the claw wheel and a position for not engaging the claw wheel, and for movably supporting the swing center portion along a concentric circle of the claw wheel. , Interlocking means for bringing the clamp member to the first position or the second position following the movement of the swing center of the pawl member engaged with the pawl wheel. , The stroke of the interlocking means when moving the clamp member to the webbing holding position is independent of the timing of engagement between the claw member and the ratchet wheel, and can be freely set by the stroke of the swing center of the claw member. . That is, it is possible to reliably move the clamp member to the webbing holding position by giving a sufficient margin to the stroke of the interlocking means for moving the clamp member to the webbing holding position.

Therefore, in a retractor having an emergency lock mechanism for locking the rotation of the winding shaft in the webbing pull-out direction in an emergency such as a collision, the webbing clamp mechanism assembled to the retractor has a simple structure. In addition, it is possible to provide a good retractor with a clamp that can reliably prevent the webbing from being pulled out.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a retractor with a clamp according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the clamp mechanism shown in FIG.

FIG. 3 is an enlarged view of a main part for explaining the operation of the emergency lock mechanism of the retractor with the clamp shown in FIG.

4 is a fragmentary side view for explaining the operation of the clamp mechanism of the retractor with clamp shown in FIG.

5 is a fragmentary side view for explaining the operation of the clamp mechanism of the retractor with clamp shown in FIG. 1. FIG.

[Explanation of symbols]

 1 Base 1a Side plate 1b Side plate 1c Base back plate 3 Spool 4 Latch plate 6 Clamp 7 Clamp lever 7e Cam face 10 Pole 11 Link member 13 Latch cup 15 Return spring 16 Lower plate 17 Lever pin 20 Upper plate 21 Through hole 22 Mounting hole 22a Cam Part 23 Through hole 24 Through port 26 Webbing 30 Vehicle body acceleration sensing means

Claims (1)

[Scope of utility model registration request] 1. A webbing pull-out of a take-up shaft by engaging a pawl member, which is provided so as to be able to engage with a ratchet wheel that rotates integrally with a take-up shaft around which webbing is wound, with the ratchet wheel in a vehicle emergency. With a clamp mechanism that has an emergency locking mechanism that can prevent rotation in any direction and that can prevent the webbing from being pulled out by sandwiching the webbing between the movable clamp member and the back surface of the retractor base. In the retractor, the control means for moving the clamp member in a webbing holding direction to position the clamp member in a first position where the webbing can be pulled out and a second position where the webbing can be pulled out are provided. The pawl member is allowed to swing between a position where it is engaged with the pawl wheel and a position where it is not engaged, and the center of the pivoting of the pawl wheel is Supporting means for movably supporting along the center circle, and movement of the swing center of the pawl member engaged with the pawl wheel are followed by the clamp member at the first position or the first position. 2 and the interlocking means for bringing the clamp member to the second position, and the swing center portion of the pawl member that is engaged with the pawl wheel in the event of a vehicle emergency resists the urging force that positions the clamp member in the second position. A retractor with a clamp which moves along a concentric circle of the ratchet wheel by the rotational force of the ratchet wheel in the pulling-out direction of the webbing and positions the clamp member to the first position via the interlocking means.