JPH07205757A - Retractor with clamp - Google Patents

Abstract

PURPOSE:To provide a retractor with clamp provided with a good clamp release mechanism improving vehicle mountability further with capability of efficiently absorbing kinetic energy generated in the body of an occupant at vehicle collision time. CONSTITUTION:An upper plate 20, fixedly provided in a side plate 1a of a base 1, has a slide contact surface 20a for guiding a clamp 6 to a webbing fastening engaging position in order to engage a drawn part of a webbing 26 fastened between itself and a lower plate 16. The upper plate 20 has a deformation part 20c, which deforms a main cantilever piece 20d to the inward of the upper plate so as to place the slide contact surface 20a almost parallel to a webbing opposed surface of the clamp 6 when applied a load of prescribed level or more by a rear end side edge 6e in a plane part of the clamp 6, to also have a subcantilever piece 20f for restricting deformation of prescribed level or more of the deformation part 20c, and the deformation part 20c is deformed according to moving the clamp 6 in a direction of drawing out the webbing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractor (winding device) for a seat belt device, and more particularly, to a device provided with a clamp mechanism that directly clamps the webbing in a vehicle emergency to minimize the amount of extension of the webbing. It concerns the improvement of the retractor.

[0002]

2. Description of the Related Art Conventionally, a seat belt device has been used to protect an occupant from a collision by restraining an occupant of a vehicle on a seat. Is equipped with not only an emergency lock mechanism that locks the rotation of the take-up shaft around which the webbing is wound in the webbing pull-out direction in the event of a vehicle emergency such as a collision, but also a clamp mechanism that holds the webbing directly and stops the seat belt from extending. , There is a vehicle with improved occupant restraint performance in the initial stage of a collision.

However, in the event of a vehicle emergency such as a collision, it is conceivable that a force greater than the breaking strength of the webbing clamped by the clamp mechanism acts. That is, when a strong pulling force that further pulls out the webbing is applied to the retractor in which the seat belt is prevented from being stretched by the above-described clamp mechanism, the force that tries to clamp the webbing more strongly in the webbing clamping portion is applied. Will be added intensively, and the webbing may be broken at this sandwiching portion. Further, when the impact force due to the collision is extremely large, the occupant's body is suddenly decelerated, and as a result, the load on the occupant by the seat belt may increase.

Therefore, for example, Japanese Patent Laid-Open No. 3-1972257.
No. 4-252761 and Japanese Utility Model Laid-Open No. 4-43550.
When a pulling force of a predetermined amount or more is applied to the webbing, a part of the rotary holding member that holds the webbing is deformed, or one end of the rotary holding member is rotatably supported (retractor). Various proposals have been made that include a clamp releasing mechanism that can release the clamping force that clamps the webbing by deforming or breaking a part of the base) or the shaft. That is, by releasing the operation of the clamp mechanism and letting out the seat belt by a predetermined amount, the deceleration that occurs in the body of the occupant is alleviated to more reliably protect the body of the occupant, and the damage of the webbing is prevented. There is something.

On the other hand, as the clamp mechanism, the clamp mechanism that prevents the seat belt from extending by holding the webbing by the rotating holding member whose one end is rotatably supported by the retractor base as described above. Separately, a clamp mechanism that prevents the seat belt from extending by sandwiching the webbing so that the wedge-shaped clamp member bites between the sliding contact surface of the guide member fixed to the retractor base and the base back plate. However, in the case of such a clamp mechanism, it is not possible to apply the various clamp release mechanisms described above due to the difference in the constituent members.

Therefore, as a clamp releasing mechanism applicable to the clamp mechanism using such a wedge-shaped clamp member, for example, Japanese Unexamined Patent Publication No. 4-2666553 and Japanese Utility Model Publication No.
There is a clamp release mechanism disclosed in Japanese Patent No. 43551 and the like. In the clamp release mechanism of the above-mentioned Japanese Patent Laid-Open No. 4-2666553, the belt retractor (retractor) and the webbing tightening means (clamp mechanism) are plastically deformed at the same time when they reach specified values, and the webbing tightens away. The webbing is connected by a connecting means that allows a limited movement of the means, and when a webbing tension force of a specified load value or more acts on the webbing tightening means, the connecting means tears and the webbing tightening means releases the sandwiching of the webbing. Is configured.

Further, in the clamp releasing mechanism of Japanese Utility Model Laid-Open No. 4-43551, the holding portion (tooth portion) provided on the surface of the holding means facing the webbing can be sheared by the pulling force acting on the webbing. When the webbing is applied with a tensile force of a predetermined amount or more, the holding portion is sheared and the holding means releases the holding of the webbing.

[0008]

However, in the retractor having the clamp releasing mechanism disclosed in JP-A-4-2666553, when a webbing tension force of a predetermined value or more acts on the webbing tightening means, the connecting means tears. Since the webbing tightening means moves in the direction away from the belt retractor, it is inevitable that the vehicle body space for storing the retractor must be expanded so that the belt retractor can be moved. There is a problem that is not good.

Further, in the retractor having the clamp releasing mechanism of Japanese Utility Model Laid-Open No. 4-43551, when a webbing tension force of a predetermined value or more acts on the holding means, the holding portion is sheared and the holding force of the webbing is released at a stretch. Therefore, the webbing tension acting on the webbing sharply decreases, and when the rotation of the winding shaft in the webbing pull-out direction is locked by the emergency locking mechanism, the webbing tension sharply increases again. Therefore, as the webbing tension increases or decreases, the deceleration that acts on the occupant's body changes significantly, and the webbing tension drops largely until the webbing clamping force is released and rises again, resulting in a collision. Therefore, it is difficult to efficiently absorb the kinetic energy generated in the body of the occupant.

Therefore, an object of the present invention is to solve the above problems, and to provide a good clamp releasing mechanism which has a good vehicle mountability and can efficiently absorb the kinetic energy generated in the body of an occupant at the time of a vehicle collision. It is to provide a retractor with a clamp.

[0011]

SUMMARY OF THE INVENTION The above object of the present invention is to provide a wedge shape for tightly engaging the pull-out portion of the webbing wound around the winding shaft of the retractor with the base back plate of the retractor. And a guide member having a sliding contact surface for slidingly contacting the flat surface portion of the clamp member opposite to the webbing facing surface to guide the clamp member to the webbing tightening engagement position, and the webbing of the take-up shaft in a vehicle emergency. In a retractor with a clamp including a clamp mechanism having an operating means for moving the clamp member in the webbing tightening direction in conjunction with an emergency lock mechanism for locking the rotation in the pull-out direction, the guide member fixed to the retractor. When the load of a predetermined amount or more is applied by the rear end side edge of the flat portion of the clamp member, the sliding contact surface is the clamp member. The webbing has a deformable portion that deforms so as to be substantially parallel to the facing surface, and a regulating means that regulates the deformation of the deformable portion beyond a predetermined value. It is achieved by a retractor with a clamp characterized in that it is configured to be deformed.

An elastic member is used for the regulating means,
The restricting means may be configured to elastically restrict the deformation of the deformable portion beyond a predetermined amount.

[0013]

According to the above configuration of the present invention, when a tensile force of a predetermined amount or more acts on the webbing in an emergency of a vehicle, a load of a predetermined amount or more is applied to the guide member via the rear end side edge of the clamp member. The clamp member moves in the webbing pull-out direction while deforming the deforming portion of the guide member such that the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, and releases the clamp mechanism.

When the deforming portion of the guide member is deformed until the clamp mechanism is released and the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, the clamp member is moved in the webbing pull-out direction. The drag force due to the restricting sliding contact surface does not act, and the clamp member is movable in the webbing pull-out direction together with the webbing, and the webbing holding force is released. Further, at this time, the deforming portion is restricted from being excessively deformed by the restricting means, and the sliding contact surface is held in a state substantially parallel to the webbing facing surface of the clamp member. Power is maintained as appropriate.

Therefore, the kinetic energy of the occupant is effectively consumed in the process of deforming the deforming portion, and the webbing holding force of the clamp member that moves even after the deforming portion completes the deformation is appropriately maintained to release the clamp. It is possible to prevent the webbing tension from suddenly dropping. Further, since the clamp mechanism is released only by deforming the deforming portion of the guide member such that the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, the vehicle body space for storing the retractor is enlarged. No need.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1st of this invention shown in FIG.1 and FIG.2.
In an exploded perspective view of a retractor with a clamp according to an embodiment, most of a base 1 has a U-shaped cross section, and a through hole 1c is formed in each of opposing base side plates 1a and 1b. A winding shaft 4 having a bobbin 2 around which a webbing is wound is fixedly mounted on the through hole 1c so as to be rotatable via left and right plastic bushes 3a and 3b. A known winding spring device 5 is arranged at one end of the winding shaft 4, and the winding shaft 4 is constantly urged in the winding direction of the webbing.

On the other hand, an emergency lock mechanism is arranged at the other end of the winding shaft 4 to prevent the webbing from being pulled out in an emergency. This emergency lock mechanism has a latch plate 4a, which is a ratchet wheel fixed to the other end of the winding shaft 4, and a part of the winding shaft 4 is projected to the outside thereof, and a through hole is formed there. The tension plate 9 inserted through 9c and the latch cup 13 which is a latch member having the internal teeth 13a are loosely fitted. Note that the spring hanger 9a formed on the spring hanger 13b and the tension plate 9 formed in the latch cup 13 is mounted a return spring 12, the latch cup 13 is action biasing force which rotates in the arrow direction X ₂ ing. On the winding shaft 4 located outside the latch cup 13, known locking means and inertia member (not shown) are arranged, and tension is applied to the webbing in an emergency such as a collision, so that the winding shaft 4 has a predetermined length. When the impact turning force in the webbing pull-out direction (arrow X ₁ direction) is applied, the latch cup 13 is rotated in the arrow X ₁ direction against the biasing force of the return spring 12.

A pawl member 11 which is engaged with the latch plate 4a to prevent the latch plate 4a from rotating in the webbing pull-out direction (arrow X ₁ direction) is provided with a pawl pin 10 via a pawl pin 10.
Is supported on the outside of the base side plate 1b so as to be engageable with and disengageable from.
The pole pin 10 is formed by the base side plates 1a and 1b facing each other.
The through hole 25 and the long hole 21 formed in the hole are inserted to bridge the outer end side shaft portion 10a in the long hole 21 around the small shaft portion 10b which is an engaging portion with the through hole 25. It is possible to swing along. Further, a through hole 9b formed in the first swing end portion of the tension plate 9 is fitted into the outer end side shaft portion 10a of the pole pin. Therefore, the pole 11 can displace the swinging rotation center along the elongated hole 21. A pole guide protrusion 11b is provided on the pole 11 so as to project into the pole guide hole 13c formed on the outer peripheral portion of the latch cup 13.

Further, a sensor case 31 constituting the vehicle body acceleration sensing means 30 is fixed to the lower portion of the base side plate 1b, and a ball weight 33 as a sensor is placed in the hollow portion and a locking projection. A sensor arm 32 having 32a is swingably attached. A sensor cover 14 is arranged outside the base side plate 1b that covers these emergency lock mechanisms.

A clamp mechanism is provided above the inside of the base 1 covered by a dust cover (not shown) to prevent the webbing from being pulled out by directly sandwiching the webbing. Explaining this with reference to the partially cutaway side view shown in FIG. 3, the clamp mechanism is provided with a clamp tooth portion 6c which is a sandwiching portion for tightening and engaging the webbing 26 by increasing frictional resistance on the surface facing the webbing. Upper stay 19 holding a clamp 6 which is a wedge-shaped clamp member and an upper plate 20 which is a guide member slidably contacting a flat surface portion 6d opposite to the webbing facing surface on which the clamp tooth portion 6c is formed. And have.

The upper stay 19 has its mounting hole 19b fitted to the protrusion 1d of the base side plates 1a and 1b.
By fixing the upper plate 20 to the mounting plate 19a with a screw, movement of the upper plate 20 in the longitudinal direction is restricted. In the upper plate 20, one corner of a hollow member having a rectangular cross section is cut out in the longitudinal direction, and an extension tongue portion 20e is formed at the tip of a main cantilever piece 20d that protrudes with the tip as a free end. The side surface has a sliding contact surface 20a that is in sliding contact with the flat surface portion 6d of the clamp 6, and is a rigid body having desired rigidity.

Further, the corner portion located on the base side of the main cantilever piece 20d is a deformed portion 20c of the upper plate 20 that deforms so that the sliding contact surface 20a is substantially parallel to the webbing facing surface of the clamp 6. The main cantilever 2
When a predetermined load or more is applied to the free end side of 0d, the cantilever piece 20d bends from the deforming portion 20c. Further, a sub-cantilever piece 20f facing the extended tongue portion 20e.
Has a corner portion located on the base side thereof bent at a predetermined angle so that the tip end surface 20g is brought into vertical contact with the surface of the bent main cantilever piece 20d.
0a is held in a state of being substantially parallel to the surface of the clamp 6 facing the webbing so as to prevent the deformable portion 20c from being excessively deformed. That is, a load larger than a predetermined value is applied to the deforming portion 20c of the main cantilever piece 20d, and the deforming portion 20c is prevented from being bent too much and the webbing holding force of the clamp 6 is suddenly released.

The upper plate 20 has both ends fitted into through holes 24 formed in the base side plates 1a and 1b facing each other, and then fixed to a mounting plate 19a of the upper stay 19 so that the clamp 6 is secured. The sliding contact surface 20a that guides to the webbing tightening engagement position is fixed so as to have a predetermined inclination angle that is closer to the lower plate 16 fixed to the base back plate 1e of the base 1 on the upper side.

The constricted tip is located on the upper side,
The plane portion 6d is the sliding contact surface 20a of the upper plate 20.
Since the clamp tooth portion 6c of the clamp 6 which is positioned in the surface contact state with the clamp plate 6 is always arranged in parallel to the surface of the sandwiched webbing 26, the clamp tooth portion 6c which slides along the sliding contact surface 20a of the upper plate 20. 6 can evenly tighten and engage the webbing 26. Also, the clamp 6
The rear part of the clamp 6 opposite to the webbing facing surface of the clamp 6
The rear end side edge 6e is formed on the rear end side of the flat surface portion 6d by being formed into a shape having a flat surface portion substantially parallel to the webbing facing surface. Further, a return spring 15 is disposed between the engaging portion 6b provided 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. It is urging in different directions.

Below the clamp 6, a clamp lever 7 for restricting the movement of the clamp 6 urged by the return spring 15 is arranged, and the clamp lever 7 is arranged outside the base side plate 1b. Together with the outer plate 8 that is provided and engages with the tension plate 9, a lever member that is an interlocking unit that moves the clamp 6 in the webbing tightening direction in conjunction with an emergency lock mechanism is configured.

The clamp lever 7 is provided with a pair of plate-shaped members 7a and 7b formed with notches 7f which engage with a pivot 6a provided on the side wall of the clamp 6, and the clamp 6 is bridged between these members. The connecting portion 7c is in contact with the rear end wall, and the hole 7d is rotatably pivotally supported by the lever pin 17 inserted into the through hole 23 formed in the opposing base side plates 1a and 1b. In the outer plate 8, one end of the lever pin 17 penetrating the through hole 23 has the hole 8
It is penetrated by b and is rotatably supported along the base side plate 1b. Further, the outer plate 8 is inserted in the elongated hole 22 of the base side plate 1b by protruding inward, and engages with the engagement hole 7e of the plate member 7a.
And a contact portion 8c that engages with an engaging portion 9d formed on the second swing end of the tension plate 9.

Then, the clamp lever 7 is connected to the clamp 6
The contact between the rear end wall and the connecting portion 7c restricts the movement of the clamp 6 against the biasing force of the return spring 15. That is, in the clamp 6, the pivot 6a has the plate-shaped member 7
The clamp teeth 6c are held at positions not engaged with the webbing 26 by being supported by the cutouts 7f formed on the swinging end sides of a and 7b, and the rear end walls being supported by the connecting portions 7c. Has been done. Therefore, when the outer plate 8 rotates upward, the clamp lever 7 is rotated upward via the inner shaft portion 8a. The clamp lever 7 rotated upward presses the pivot shaft 6a of the clamp 6 against the urging force of the return spring 15 to move the flat surface portion 6d to the sliding contact surface 20a of the upper plate 20.
The clamp 6 while sliding it along the webbing 26
Move in the direction to engage. At this time, the elongated hole 22 does not interfere with the inner shaft portion 8a.

Further, the spring hanger 9a of the tension plate 9 is engaged with the other end of the return spring 18 whose one end is engaged with the lever pin 17, and the tension plate 9 has the return spring 12 attached thereto. It is rotationally biased in the arrow X ₂ direction by the biasing force of the return spring 18 which is larger than the biasing force. Therefore, the pole pin 10 is provided on the back plate side end surface 21a of the elongated hole 21.
The webbing is biased in the webbing winding direction.

Therefore, the first position at which the lever 6 composed of the clamp lever 7 and the outer plate 8 and the tension plate 9 can move the clamp 6 in the webbing clamping direction to prevent the webbing 26 from being pulled out. And a second position that allows the webbing 26 to be pulled out.

Next, the operation of the retractor with a clamp will be described. First, in normal use, as shown in FIG.
, The inner shaft portion 8a of the outer plate 8 that engages with the engagement hole 7e of the clamp lever 7 is located at the lower end of the elongated hole 22 by the urging force of the return spring 15. 6 is urged by the urging force of the return spring 15 in a direction that does not engage with the webbing 26. Further, as shown in FIG. 7, the latch cup 13 is biased in the arrow X ₂ direction by the biasing force of the return spring 12 mounted on the spring hanger 13b and the spring hanger 9a of the tension plate 9, and the pole guide The pawl 11 with which the pawl guide protrusion 11b engages with the hole 13c is urged in a direction not engaging with the latch plate 4a, so that the webbing 26 can be pulled out freely.

However, in an emergency such as a collision, the webbing 2
When a tension is applied to the winding shaft 6 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 4, an inertia member (not shown) receives an inertial force to rotate the winding shaft 4. A rotation delay occurs with respect to the rotation in the webbing pull-out direction. Then, the locking means is actuated, and the engaging portion 28 a of the lock member 28 causes the inner teeth 13 a of the latch cup 13.
, The rotational force of the flange 27 is transmitted to the latch cup 13, and as shown in FIG.
Is rotated in the direction of arrow X ₁ against the biasing force of the return spring 12. The pole guide hole 13c that engages with the pole guide protrusion 11b is
The pole 11 is rotated in the direction of arrow Z via b to engage the engaging portion 11a with the latch plate 4a.

When the take-up shaft 4 is further rotated in the direction of the arrow X _{1 with} the engaging portion 11a of the pole 11 engaged with the latch plate 4a, the pole pin 10 pivotally supporting the pole 11 causes the tension plate 9 to rotate. The tension plate 9 rotates in the direction of the arrow X ₁ because it moves from the back plate side end surface 21a in the elongated hole 21 toward the front side end surface 21b against the biasing force of the return spring 15 acting via the. To be made. Then, the engaging portion 9d of the tension plate 9 rotates the outer plate 8 in the arrow Y direction via the contact portion 8c of the outer plate 8, so that the inner side shaft portion 8a through which the elongated hole 22 is inserted is inserted. Clamp lever 7 is also arrow Y
Is rotated in the direction.

Therefore, the clamp 6 supported by the notch 7f formed on the swinging end side of the clamp lever 7 is immediately moved upward along the sliding contact surface 20a 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 slid upward against the urging force of the return spring 15 is webbed. It moves in the sandwiching direction (arrow W direction) and bites between the sliding contact surface 20a and the lower plate 16.

Here, the rear end side edge 6e of the clamp 6 is located closer to the free end side of the cantilever piece 20d than the deforming portion 20c, so that the cantilever piece 20d is moved to the upper plate 2.
Although the force of bending inward of 0 acts on the deformable portion 20c, the tensile force acting on the webbing 26 is smaller than a predetermined tensile force, and the clamp 6 causes the cantilever 20 to move.
When the load applied to d is smaller than the predetermined load, the upper plate 20 has sufficient rigidity so that the deforming portion 20c does not deform, so the webbing 26 is attached to the clamp 6 and the lower plate 16. It is pinched and the drawer is blocked.

The pole pin 10, which pivotally supports the pole 11, stops moving when it comes into contact with the front end face 21b in the elongated hole 21, and the winding shaft 4 rotates in the direction of arrow X _1. The pole pin 10 prevents the end face 21 on the front side.
The timing of contact with b is matched to the timing of contact immediately after the clamp tooth portion 6c completely bites into the webbing 26. The operation timings of the clamp 6 and the pole 11 can be arbitrarily changed by appropriately changing the shapes of the contact portion 8c and the elongated hole 21.

Further, even when the vehicle receives a speed change more than a predetermined value in an emergency, the vehicle body acceleration sensing means 30 activates the lock means to activate the clamp mechanism and the emergency lock mechanism as described above. Then, when the tension applied to the webbing 26 is released, the force for holding the clamp 6 in the clamping direction disappears, and the clamp 6 is biased by the biasing force of the return spring 15 in the direction not engaged with the webbing 26. The clamp mechanism is released. At the same time, the tension plate 9 also rotates in the releasing direction (arrow X ₂ direction), and the clamp 6 and the tension plate 9 return to their initial positions. When the webbing 26 is further rolled up,
The pole 11 is rotated in the direction opposite to the arrow Z direction, and the lock between the latch plate 4a and the engaging portion 11a is released.
When the webbing 26 is further wound, the lock member 28
The engagement between the engaging portion 28a of the latch cup 13 and the inner tooth 13a of the latch cup 13 is released, the latch cup 13 is rotated in the direction of the arrow X ₂ by the urging force of the return spring 12, and is returned to the initial position. You can freely withdraw.

However, in the clamped state as described above, the impact force at the time of collision becomes excessively large and the webbing 26
When the pulling force F of the clamp 6 is further increased, the clamp 6 further tries to move in the direction of the arrow W, so that the tension force (drag force) of the clamp 6 on the lower plate 16 and the cantilever piece 20d is also increased. Therefore, a tensile force F of a predetermined amount or more acts on the webbing 26, so that the rear end side edge 6e of the clamp 6 acts on the deformable portion 20c to bend the cantilever piece 20d inward of the upper plate 20. Because of the above load, the clamp 6 moves in the webbing pull-out direction while deforming the deformable portion 20c so that the sliding contact surface 20a is substantially parallel to the webbing facing surface of the clamp 6, as shown in FIG. , The clamp mechanism is released. Therefore, breakage of the webbing 26 at the sandwiched portion is avoided.

Even after the webbing 26 extends from the retractor and the clamp mechanism is released by moving the clamp 6 in the webbing pull-out direction, the clamp 6 restricts its movement as shown in FIG. The sliding contact surface 20a of the upper plate 20 is substantially parallel to the webbing facing surface of the clamp 6, and the extension tongue portion 20e of the main cantilever piece 20d bent inward of the upper plate 20 is the tip surface of the sub cantilever piece 20f. While the deforming portion 20c is deformed until it abuts 20g, it moves in the webbing pull-out direction. Even when the clamping force of the webbing by the clamp mechanism is released, the webbing 26 is prevented from being pulled out by the emergency lock mechanism via the take-up shaft 4, so that the clamp 6 moves in the webbing pull-out direction at the same time. The webbing 26 wound around 2 is tightly wound and extends.

At this time, the main cantilever piece 20d is held by the sub-cantilever piece 20f, and the sliding contact surface 20a is held in a state substantially parallel to the webbing facing surface of the clamp 6.
The deforming portion 20c is not bent too much after the clamp mechanism is released, and the webbing holding force of the clamp 6 is not suddenly released. Therefore, the deformation resistance generated when the deformation portion 20c is deformed effectively consumes the kinetic energy of the occupant at the time of a vehicle collision via the webbing 26, and moves even after the deformation portion 20c completes the deformation. Clamp 6
The webbing clamping force can be appropriately kept constant, and a sudden drop in the webbing tension when the clamp is released can be prevented. Further, the clamp mechanism is released, and the rotation of the winding shaft 4 in the webbing pull-out direction is locked by the emergency lock mechanism to prevent a large change in the deceleration acting on the body of the occupant when the webbing tension increases again. It is possible,
A very effective protection function can be exhibited.

In the retractor with a clamp of the first embodiment, the deforming portion 20c of the upper plate 20 is deformed so that the sliding contact surface 20a is substantially parallel to the webbing facing surface of the clamp 6. Since the mechanism is released, it is not necessary to expand the vehicle body space for storing the retractor, and the vehicle mountability is good. In addition, the sliding portion 20a of the upper plate 20 is maintained in a state of being substantially parallel to the webbing facing surface of the clamp 6, and the deforming portion 20
The restricting means for restricting c from being excessively deformed is not limited to the auxiliary cantilever piece 20f whose tip surface 20g abuts on the extended tongue portion 20e in the first embodiment, and can of course take various forms. is there.

For example, FIG. 8 is an enlarged sectional view of an essential part of a clamp mechanism in a retractor with a clamp according to a second embodiment equipped with another restricting means according to the present invention, and is an upper guide member constituting the clamp mechanism. The plate 40 has a substantially U-shaped cross-section, and the flat surface portion 6 of the clamp 6 is provided on the outer surface of the one cantilever piece 40d which is protruded with its tip as a free end.
It is a rigid body that has a sliding contact surface 40a that is in sliding contact with d and is given a desired rigidity. The other cantilever piece 40f of the upper plate 40 is fixed to the mounting plate 19a of the upper stay 19 (not shown) so that the clamp 6
Sliding contact surface 4 for guiding the webbing to the webbing tightening engagement position
0a is fixed to the lower plate 16 fixed to the base back plate so as to have a predetermined inclination angle which is closer to the lower plate 16 on the upper side.

The corner portion of the cantilever piece 40d located on the base side is a deforming portion 40c of the upper plate 40 that deforms so that the sliding contact surface 40a is substantially parallel to the webbing facing surface of the clamp 6. And the cantilevered piece 40
When a load larger than a predetermined value is applied to the free end side of d, the cantilever piece 40d bends from the deforming portion 40c. Further, inside the upper plate 40, an insert member 41 which is a solid member having a substantially triangular cross section is arranged,
The sliding contact surface 40a is held in a state of being substantially parallel to the webbing facing surface of the clamp 6 to form a restriction means for restricting the deformation portion 40c from being excessively deformed.

That is, when the cantilever 40d is bent inward of the upper plate 40 by the clamp 6 due to the tensile force F acting on the webbing 26 above a predetermined level, as shown by the chain double-dashed line in FIG. In addition, since the cantilevered piece 40d after the clamp is released is pressed against the insert member 41 and the sliding contact surface 40a is held in a state substantially parallel to the webbing facing surface of the clamp 6, the deformable portion 40c bends too much and the clamp 6 is bent. The webbing clamping force of is not suddenly released.

FIG. 9 is an enlarged sectional view of an essential part of a clamp mechanism in a retractor with a clamp according to a third embodiment equipped with another restricting means according to the present invention. The upper plate 50 is a guide member constituting the clamp mechanism. Has a substantially U-shaped cross-section and has an extended tongue portion 50e formed at the tip of one cantilever piece 50d that is bulged with the tip as a free end, and is in sliding contact with the flat surface portion 6d of the clamp 6 on the outer surface. It is a rigid body that has a sliding contact surface 50a and is given a desired rigidity.
The other cantilever piece 50f of the upper plate 50 is
The sliding contact surface 50a for guiding the clamp 6 to the webbing tightening engagement position by being fixed to the mounting plate 19a of the upper stay 19 (not shown) is located above the lower plate 16 fixed to the base back plate 1e. It is fixed so as to have a predetermined inclination angle that is close to.

The corner portion of the cantilevered piece 50d located on the base side is a deformed portion 50c of the upper plate 50 that deforms so that the sliding contact surface 50a becomes substantially parallel to the webbing facing surface of the clamp 6. And the cantilevered piece 50
When a predetermined load or more is applied to the free end side of d, the cantilever piece 50d bends from the deforming portion 50c. Further, on the upper side of the upper plate 50, an abutment pin 51 inserted through a through hole formed in the opposing base side plate is bridged so as to be located within the swing range of the extension tongue portion 50e. The sliding contact surface 50a is held in a state substantially parallel to the webbing facing surface of the clamp 6 so as to prevent the deformable portion 50c from being excessively deformed.

That is, when the cantilever piece 50d is bent inward of the upper plate 50 by the clamp 6 by the pulling force F acting on the webbing 26 of a predetermined value or more, as shown by the chain double-dashed line in FIG. Further, the extended tongue portion 50e of the cantilever piece 50d after releasing the clamp has the contact pin 5
Since the sliding contact surface 50a is held in a state of being substantially parallel to the webbing facing surface of the clamp 6, the deformable portion 50a
There is no possibility that the webbing clamping force of the clamp 6 is suddenly released by the excessive bending of c.

FIG. 10 is an enlarged sectional view of an essential part of a clamp mechanism in a retractor with a clamp according to a fourth embodiment equipped with another restricting means according to the present invention. The upper plate 60 is a guide member constituting the clamp mechanism. Is cross section U
A rigid body that has a desired rigidity by having a sliding contact surface 60a that is in sliding contact with the flat surface portion 6d of the clamp 6 on the outer surface of the one cantilever piece 60d that has a letter shape and is bulged with the tip as a free end. Is. The other cantilever piece 60f of the upper plate 60 is the mounting plate 1 for the upper stay 19 (not shown).
By being fixed to 9a, the sliding contact surface 60a for guiding the clamp 6 to the webbing tightening engagement position has a predetermined inclination angle that is closer to the lower plate 16 fixed to the base back plate 1e on the upper side. It is fixed to have.

The corner portion of the cantilever piece 60d located on the base side is a deforming portion 60c of the upper plate 60 that deforms so that the sliding contact surface 60a is substantially parallel to the webbing facing surface of the clamp 6. And the cantilevered piece 60
When a predetermined load or more is applied to the free end side of d, the cantilever piece 60d bends from the deformable portion 60c. Further, the upper plate 60 is attached to the tip of the cantilever piece 60d.
Ribs 61 projecting inward are formed, and the sliding contact surface 60a is held substantially parallel to the webbing facing surface of the clamp 6 to restrict the deforming portion 60c from over-deforming. Are configured.

That is, when the cantilever piece 60d is bent inward of the upper plate 60 by the clamp 6 by the tensile force F of a predetermined force or more acting on the webbing 26, as shown by the chain double-dashed line in FIG. In the cantilever piece 60d after the clamp is released, the rib 61 has the cantilever piece 6d.
Since the sliding contact surface 60a is held in a state of being substantially parallel to the webbing facing surface of the clamp 6, the deforming portion 60c is excessively bent, and the webbing holding force of the clamp 6 is rapidly released. Never.

FIG. 11 is an enlarged sectional view of an essential part of a clamp mechanism in a retractor with a clamp according to a fifth embodiment equipped with another restricting means according to the present invention. The upper plate 70 is a guide member constituting the clamp mechanism. Is cross section U
A rigid body having a desired rigidity by having a sliding contact surface 70a that is in sliding contact with the flat surface portion 6d of the clamp 6 on the outer surface of the one cantilever piece 70d that has a letter shape and is projected with the tip as a free end. Is. The other cantilever 70f of the upper plate 70 is the mounting plate 1 for the upper stay 19 (not shown).
By being fixed to 9a, the sliding contact surface 70a for guiding the clamp 6 to the webbing tightening engagement position has a predetermined inclination angle that is closer to the lower plate 16 fixed to the base back plate on the upper side. To be fixed.

The corner portion of the cantilevered piece 70d located on the base side is a deformed portion 70c of the upper plate 70 that deforms so that the sliding contact surface 70a is substantially parallel to the webbing facing surface of the clamp 6. And the cantilevered piece 70
When a load larger than a predetermined value is applied to the free end side of d, the cantilevered piece 70d bends from the deformed portion 70c. Further, a rubber block 71, which is an elastic member having a substantially trapezoidal cross section, is disposed inside the upper plate 70, and the sliding contact surface 70a is held in a state substantially parallel to the webbing facing surface of the clamp 6. Thus, a regulating means for regulating the deforming portion 70c so as not to deform too much is configured.

That is, when the cantilevered piece 70d is bent inward of the upper plate 70 by the clamp 6 by the pulling force F acting on the webbing 26 of a predetermined value or more, as shown by the chain double-dashed line in FIG. Further, the cantilevered piece 70d after releasing the clamp is pressed against the rubber block 71, and after the rubber block 71 is compressed and deformed by the thickness d, the sliding contact surface 70a becomes substantially parallel to the webbing facing surface of the clamp 6. Since the deformed portion 70c is not bent too much, the webbing holding force of the clamp 6 is not suddenly released because it is held. Furthermore, the cantilever piece 70d includes
Since the elastic force of the rubber block 71 that urges the clamp 6 in the webbing holding direction acts, the clamp 6 can be more reliably held.
The webbing clamping force can be maintained. As the elastic member, a block member made of synthetic resin or the like can be used in addition to the rubber block, and a spring member such as a compression coil spring can be used as the cantilever 70d and the cantilever 7
You may interpose between 0f.

The shape of the guide member, the position and the number of the deformed portions of the guide member in the present invention are not limited to those of the above-mentioned embodiments, and various modifications can be made. Of course. 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 including other inertial sensing means and locking means.

[0054]

Thus, according to the retractor with a clamp of the present invention, when a tensile force of a predetermined value or more acts on the webbing in an emergency of the vehicle, the sliding contact surface of the guide member of the clamp member is substantially the same as the webbing facing surface of the clamp member. While deforming the deforming portion of the guide member so as to be parallel to each other, the deforming portion is moved in the webbing pull-out direction to release the clamp mechanism, and the deforming portion is restricted from being excessively deformed by the restricting means, and the sliding contact surface has the clamp member. The surface is held substantially parallel to the webbing facing surface.

Therefore, the kinetic energy of the occupant is effectively consumed in the process of deforming the deforming portion, and the webbing clamping force of the clamp member is appropriately maintained even after the unclamping, so that the webbing tension suddenly drops when the unclamping is released. Can be prevented. Further, since the clamp mechanism is released only by deforming the deforming portion of the guide member such that the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, the vehicle body space for storing the retractor is enlarged. No need.

Therefore, it is possible to provide a retractor with a clamp, which has a good mountability on a vehicle and can efficiently absorb the kinetic energy generated in the body of an occupant at the time of a vehicle collision.

[Brief description of drawings]

FIG. 1 is a part of an exploded perspective view of a retractor with a clamp according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the remaining portion of the retractor with clamp shown in FIG.

FIG. 3 is a partially cutaway side view for explaining the operation of the clamp mechanism of the retractor with clamp shown in FIG.

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

5 is an enlarged side view of an essential part for explaining the operation of the clamp mechanism shown in FIG.

6 is an enlarged side view of an essential part for explaining the operation of the clamp mechanism shown in FIG.

FIG. 7 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.

FIG. 8 is an enlarged sectional view of an essential part for explaining the operation of the clamp mechanism according to the second embodiment of the present invention.

FIG. 9 is an enlarged side view of an essential part for explaining the operation of the clamp mechanism according to the third embodiment of the present invention.

FIG. 10 is an enlarged sectional view of an essential part for explaining the operation of the clamp mechanism according to the fourth embodiment of the present invention.

FIG. 11 is an enlarged side view of an essential part for explaining the operation of the clamp mechanism according to the fifth embodiment of the present invention.

[Explanation of symbols]

 1 base 1a base side plate 1b base side plate 1e base back plate 4 winding shaft 4a latch plate 6 clamp 7 clamp lever 8 outer plate 9 tension plate 10 pole pin 11 pole 15 return spring 16 lower plate 18 return spring 19 upper stay 20 upper plate 20a Sliding surface 20c Deformation part 20d Main cantilever piece 26 Webbing 30 Vehicle body acceleration sensing means

Claims (1)

[Claims] 1. A wedge-shaped clamp member for tightening and engaging a drawn-out portion of a webbing wound around a winding shaft of a retractor with a base back plate of the retractor, and a webbing facing surface of the clamp member. A guide member having a sliding contact surface that slides in contact with a flat surface portion on the opposite side to guide the clamp member to the webbing tightening engagement position; and an emergency locking mechanism that locks rotation of the winding shaft in the webbing pull-out direction in an emergency of the vehicle. In a retractor with a clamp provided with a clamp mechanism having an operating means for interlockingly moving the clamp member in a webbing tightening direction, the guide member fixed to the retractor is a rear end of a flat portion of the clamp member. When a predetermined load or more is applied by the side edge, the sliding contact surface becomes substantially parallel to the webbing facing surface of the clamp member. In addition to having a deformable portion that deforms as described above, it also has a regulating means that regulates the deformation of the deformable portion beyond a predetermined value, and the deformable portion is configured to be deformed as the clamp member moves in the webbing pull-out direction. Retractor with a clamp that is characterized by