JPH0719026U - Retractor with clamp - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a clamp-equipped retractor having a good vehicle mountability and a good clamp releasing mechanism capable of efficiently absorbing kinetic energy generated in the body of an occupant during a vehicle collision. [Structure] An upper plate 20 fixed to a side plate 1a of a base 1 is provided with a wedge-shaped clamp 6 for tightening and engaging a pullout portion of a webbing 26 with a base back plate 1b of a retractor. It has a sliding contact surface 20a for guiding to the mating position. The upper plate 20 is cantilevered so that the sliding contact surface 20a is substantially parallel to the webbing facing surface of the clamp 6 when a load larger than a predetermined amount is applied by the rear end side edge 6e of the flat portion of the clamp 6. It has a deforming portion 20c for deforming the piece 20d inward of the upper plate 20, and the deforming portion 20c is deformed as the clamp 6 moves in the webbing pull-out direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a retractor (winding device) for a seat belt device, and more particularly, to an improvement of a retractor with a clamp having a clamp mechanism that minimizes the amount of webbing pulled out by directly sandwiching the webbing in an emergency of the vehicle. Is.

[0002]

[Prior art]

 Conventionally, a seat belt device is used to protect the occupant from the impact of a collision by restraining the occupant of the vehicle in the seat. 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 an emergency, but also a clamp mechanism that holds the webbing directly to prevent the seat belt from extending, and Some have improved the occupant restraint performance in the early stages.

However, in a vehicle emergency such as a collision, it is conceivable that a force greater than the breaking strength thereof acts on the webbing held by the clamp mechanism. In other words, if 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 clump mechanism as described above, the webbing should be clamped more strongly in the webbing clamping portion. Therefore, the webbing may be broken at the sandwiched 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, like a retractor with a clamp disclosed in Japanese Patent Laid-Open Nos. 3-197257, 4-252761, and 4-43550, a tensile force of a predetermined amount or more is applied to the web. And part of the rotary pinching member that holds the webbing deforms, or part of the case (retractor base) or shaft that rotatably supports one end of the rotary pinching member deforms. Alternatively, various types have been proposed that are provided with a clamp release mechanism that can be broken and release the holding force that holds the webbing. 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 occupant's body is alleviated to more reliably protect the occupant's body and prevent the webbing from being damaged. There is something I did.

On the other hand, as the clamp mechanism, there is a 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 crumple 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. Although there is a mechanism, in the case of such a clamp mechanism, it is not possible to apply the various clamp releasing mechanisms described above due to the difference in the constituent members.

Therefore, a clamp releasing mechanism that can be applied to a clamp mechanism using such a wedge-shaped clamp member is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-266553 and Japanese Utility Model Application Laid-Open No. 4-43551. There is a clamp release mechanism. In the clamp releasing mechanism of the above-mentioned Japanese Patent Laid-Open No. 4-266553, the belt retractor (retractor) and the webbing tightening means (clamp mechanism) are plastically deformed at the same time when the belt retractor and the webbing tightening means (clamp mechanism) reach a specified value, and the webbing tightener moves away from the belt retractor. The webbing tightening means is connected by a connecting means that allows 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 holds the webbing. It is configured to release.

Further, in the clamp releasing mechanism of Japanese Utility Model Laid-Open No. 4-43551, the sandwiching portion (tooth portion) provided on the surface of the sandwiching means facing the webbing is made shearable by the tensile force acting on the webbing. Therefore, 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]

[Problems to be solved by the device]

 However, in the retractor having the unclamping mechanism disclosed in JP-A-4-2666553, when a webbing pulling force of a predetermined value or more acts on the webbing tightening means, the connecting means is torn and the webbing tightening means becomes a belt. Since the vehicle moves in a direction away from the retractor, the vehicle space for storing the retractor must be expanded so that the belt retractor can be moved, and the vehicle mountability is not good. is there.

Further, in the retractor equipped with the clamp releasing mechanism of Japanese Utility Model Laid-Open No. 4-43551, when a predetermined webbing tension force acts on the clamping means, the clamping part is sheared and the webbing clamping force is released all at once. Therefore, the webbing tension acting on the webbing drops sharply, and when the rotation of the take-up shaft in the webbing pull-out direction is locked by the emergency locking mechanism, the webbing tension rises sharply again. Therefore, as the webbing tension increases or decreases, the deceleration acting on the occupant's body changes significantly, and the webbing tension drops greatly until the webbing clamping force is released and rises again. 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-mentioned problems, and to provide a good unclamping 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 equipped with a clamp.

[0011]

[Means for Solving the Problems]

 The above object of the present invention is to provide a wedge-shaped clamp member for tightening and engaging the pull-out portion of the webbing wound around the retractor winding shaft with the base back plate of the retractor, and a clamp member. And a guide member having a sliding contact surface for slidingly guiding the clamp member to the webbing tightening engagement position by slidingly contacting a flat surface portion on the opposite side of the webbing facing surface, and locking the rotation of the winding shaft in the webbing pull-out direction in the event of a vehicle emergency. In a retractor with a clamp equipped with a clamp mechanism having an operation means for moving the clamp member in the webbing tightening direction in conjunction with an emergency lock mechanism, the guide member fixed to the retractor is the clamp member. When a load larger than a predetermined value is applied by the rear end side edge of the flat surface of the member, the sliding contact surface is almost the same as the webbing facing surface of the clamp member. Achieved by a retractor with a clamp, characterized in that it has a deformable portion that deforms in parallel, and that the deformable portion is configured to be deformed as the clamp member moves in the webbing pull-out direction. To be done.

[0012]

[Action]

 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 the 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 deforming portion of the guide member is deformed so that the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, and the guide member is moved in the webbing pull-out direction.

When the deformable portion of the guide member is deformed until the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, the clamp member is movable in the webbing pull-out direction and the clamp mechanism is released. It That is, when the sliding contact surface becomes substantially parallel to the webbing facing surface of the clamp member, the drag force of the sliding contact surface that restricts the movement of the clamp member in the webbing pull-out direction does not act on the clamp member, and the clamp member and the webbing move together. The webbing clamping force is released because it can move in the pulling direction.

Therefore, the kinetic energy of the occupant can be effectively consumed in the process of deforming the deforming portion, and a sudden drop in the webbing tension when the clamp is released can be prevented. Further, since the clamp mechanism is released only by deforming the deforming portion of the guide member so that the sliding contact surface is substantially parallel to the webbing facing surface of the clamp member, the vehicle body space for accommodating the retractor is enlarged. No need.

[0015]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the exploded perspective view of the retractor with a clamp according to the first embodiment of the present invention shown in FIG. 1 and FIG. 2, most of the base 1 has a U-shaped cross section, and the opposing side plates 1a have Through holes 1c are formed opposite to each other, and a winding shaft 4 having a bobbin 2 around which webbing is wound is fixed to the through holes 1c via left and right plastic bushes 3a, 3b. It is mounted so that it can move freely. A well-known tension reducer 5 is arranged at one end of the winding shaft 4, and the winding shaft 4 is constantly biased in the winding direction of the webbing.

On the other hand, an emergency lock mechanism for preventing the webbing from being pulled out in an emergency is arranged at the other end of the winding shaft 4. 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 of the latch plate 4a. A tension plate 9 inserted through 9c and a latch cup 13 which is a latch member having 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 inertial member (not shown) are arranged, and tension is applied to the webbing in an emergency such as a collision to wind the winding. When a rotational force in the webbing pull-out direction (arrow X ₁ direction) which is more than a predetermined impact is applied to the shaft 4, the latch cup 13 is rotated in the arrow X ₁ direction against the biasing force of the return spring 12. To do.

In addition, a pawl member 11 that is engaged with the latch plate 4 a to prevent the latch plate 4 a from rotating in the webbing pull-out direction (arrow X ₁ direction) is provided with a pawl pin 10 via a pawl pin 10. It is rotatably supported on the outer side of the side plate 1a so as to be disengageable from the 4a. The pole pin 10 is bridged by penetrating through the through holes 27 and the elongated holes 21 formed in the opposing side plates 1a, and the outer end side shaft portion is centered on the engaging portion with the through hole 27. 10a is swingable along the elongated hole 21. Further, a through hole 9b formed in the first swinging end 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 projection 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 which constitutes the vehicle body acceleration sensing means 30 is fixedly provided under the side plate 1a, and a ball weight 33 which is 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 provided outside the side plate 1a 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 also with reference to the partially broken side view shown in FIG. 3, the clamp mechanism is a clamp which is a wedge-shaped clamp member in which a clamp tooth portion 6c for clamping and engaging the webbing 26 is formed on a surface facing the webbing. 6 and an upper stay 19 holding an upper plate 20 which is a guide member in sliding contact with a flat surface portion 6d opposite to the webbing facing surface on which the clamp tooth portion 6c is formed.

The upper stay 19 has its mounting hole 19b fitted to the protrusion 1d of the side plate 1a, and the upper plate 20 is fixed to the mounting plate 19a with a screw, thereby restricting the longitudinal movement of the upper plate 20. is doing. The upper plate 20 is formed by notching one corner portion of a hollow member having a rectangular cross section in the longitudinal direction and slidingly contacting the flat surface portion 6d of the clamp 6 with the outer surface of the cantilever piece 20d which is protruded with the tip as a free end. It is a rigid body that has a contact surface 20a and is given a desired rigidity. Further, the corner portion located on the base end side of the cantilever piece 20d is a deforming portion 20c of the upper plate 20 that deforms so that the sliding contact surface 20a becomes substantially parallel to the webbing facing surface of the clamp 6. When a load greater than a certain amount is applied to the free end side of the cantilever piece 20d, the cantilever piece 20d bends from the deforming portion 20c.

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

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. Further, since the rear portion of the clamp 6 on the side opposite to the webbing facing surface is formed in a shape having a flat surface portion substantially parallel to the webbing facing surface of the clamp 6, the rear end side of the flat surface portion 6d is formed. A rear edge 6e is formed. Further, a return spring 15 is arranged between the engaging portion 6b protrudingly provided on the rear end side of the clamp 6 and the rear end surface 20b of the upper plate 20. It is biased in the engaging direction.

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 inside the side plate 1a. Together with the outer plate 8 which is engaged with the tension plate 9, a lever member which is an interlocking means for interlocking with the emergency locking mechanism to move the clamp 6 in the webbing tightening direction is configured.

The clamp lever 7 is provided with a pair of plate-shaped members 7a and 7b formed with notches 7f that engage with a pivot 6a provided on a side wall of the clamp 6, and the clamp lever 7 is bridged between the plate-shaped members 7a and 7b. 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 hole 23 formed in the opposing side plate 1a. The outer plate 8 has a hole 8b penetrating one end of a lever pin 17 penetrating the through hole 23, and is pivotally supported along the side plate 1a. Further, the outer plate 8 has an inner side shaft portion 8a which is inserted into the elongated hole 22 of the side plate 1a so as to be engaged with the engagement hole 7e of the plate member 7a by protruding inward, and the tension plate. The plate 9 has an abutting portion 8c that engages with an engaging portion 9d formed on the second swinging end portion of the plate 9.

The clamp lever 7 is prevented from rotating downward by the inner shaft portion 8 a locked in the elongated hole 22, so that the clamp 6 moves against the urging force of the return spring 15. Are regulated. That is, the clamp 6 has its pivot shaft 6a supported by the notch portion 7f formed on the swinging end side of the plate-shaped members 7a, 7b, and its rear end wall supported by the connecting portion 7c, so that the clamp tooth portion thereof is 6c is held at a position not engaged with the webbing 26. 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 pushes the pivot shaft 6a of the clamp 6 against the biasing force of the return spring 15 to slide the flat surface portion 6d along the sliding contact surface 20a 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 elongated hole 22 does not interfere with the inner shaft portion 8a.

Further, in the tension plate 9, the outer plate 8 on which the urging force of the return spring 15 is larger than the urging force of the return spring 12 causes the engaging portion 9 d of the second swing end portion to be acted upon. Is pressed downward in the figure and is rotationally biased in the direction of arrow X ₂ . Therefore, the pole pin 10 is urged in the webbing winding direction on the back plate side end surface 21a side of the elongated hole 21.

Accordingly, the lever 6 including the clamp lever 7 and the outer plate 8 and the tension plate 9 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, during normal use, as shown in FIG. 3, the inner shaft portion 8a of the outer plate 8 that engages with the engaging hole 7e of the clamp lever 7 is moved inside the elongated hole 22 by the urging force of the return spring 15. The clamp 6 is located at the lower end of the webbing 26 and is urged by the urging force of the return spring 15 in a direction in which the clamp 6 is not engaged with the webbing 26. Further, as shown in FIG. 6, the latch cup 13 is urged in the direction of the arrow X ₂ by the urging 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 hole guide projection 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, when the webbing 26 is tensioned in an emergency such as a collision, and the turning force in the webbing pull-out direction (the direction of arrow X ₁ ) is applied to the winding shaft 4 more than a predetermined impact, it is not shown. The inertial member receives an inertial force and causes a rotation delay with respect to the rotation of the winding shaft 4 in the webbing pull-out direction. Then, the locking means is actuated, and the engaging portion 28a of the locking member 28 engages with the inner teeth 13a of the latch cup 13, so that the turning force of the flange 27 is transmitted to the latch cup 13, and as shown in FIG. The latch cup 13 is rotated in the direction of arrow X ₁ against the urging force of the return spring 12. Then, the pole guide hole 13c which engages with the pole guide protrusion 11b rotates the pole 11 in the arrow Z direction through the pole guide protrusion 11b to engage the engaging portion 11a with the latch plate 4a.

When the winding shaft 4 is further rotated in the direction of the arrow X _{1 while} the engaging portion 11a of the pole 11 is engaged with the latch plate 4a, the pole pin 10 that pivotally supports the pole 11 moves to the tension plate 9a. The tension plate 9 rotates in the direction of 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 urging force of the return spring 15 acting via the. Be moved. 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 shaft portion 8a inserted through the elongated hole 22a. The clamp lever 7 is also rotated in the arrow Y direction via.

Therefore, the clamp 6 supported by the notch 7f formed on the swing 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 close 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 clamping direction (the direction of arrow W) and bites between the sliding contact surface 20a and the lower plate 16.

Since 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, the cantilever piece 20d can be bent inward of the upper plate 20. If the pulling force acting on the webbing 26 is smaller than the predetermined pulling force and the load applied to the cantilever piece 20d by the clamp 6 is smaller than the predetermined load, Since the upper plate 20 has sufficient rigidity so that the deformed portion 20c does not deform, the webbing 26 is sandwiched between the clamp 6 and the lower plate 16, and the withdrawal is prevented.

The pole pin 10, which pivotally supports the pole 11, stops moving when it comes into contact with the front end surface 21b in the elongated hole 21, and moves in the direction of the arrow X ₁ of the winding shaft 4. Although the rotation is prevented, the timing at which the pole pin 10 comes into contact with the front end face 21b is matched with the timing at which the clamp tooth portion 6c comes into contact with the webbing 26 immediately after it is completely engaged. The operation timing 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 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 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 wound, 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. Upon further incorporated winding webbing 26 is engagement releasing the internal teeth 13a of the engagement portion 28a and the latch cup 13 of the locking member 28, direction of arrow X ₂ by the biasing force of the latch cup 13 return spring 12 The webbing 26 is turned to the initial position, and the webbing 26 is automatically pulled out.

However, in the clamped state as described above, when the impact force at the time of collision becomes excessively large and the tensile force F of the webbing 26 becomes even larger, the clamp 6 tries to move further in the direction of the arrow W, so that the lower plate 16 Also, the tension (drag) of the clamp 6 against the cantilever 20d is increased. Therefore, when a tensile force F of a predetermined value or more acts on the webbing 26, the rear end side edge 6e of the clamp 6 acts on the deformable portion 20c in an attempt to bend the cantilever piece 20d inward of the upper plate 20. Since the force exerted by the clamp 6 also exceeds a predetermined value, the deformable portion 20c is deformed so that the sliding contact surface 20a of the clamp 6 becomes substantially parallel to the webbing facing surface of the clamp 6, as shown in FIG. 5 (a). While moving in the webbing pull-out direction.

Then, as shown in FIG. 5B, when the deforming portion 20c is deformed until the sliding contact surface 20a becomes substantially parallel to the webbing facing surface of the clamp 6, the clamp 6 moves in the webbing pull-out direction. It becomes movable and the clamp mechanism is released. That is, when the sliding contact surface 20a becomes substantially parallel to the webbing facing surface of the clamp 6, the drag force of the sliding contact surface 20a that restricts the movement of the clamp 6 in the webbing pull-out direction is no longer applied to the clamp 6, and the clamp 6 is moved to the webbing. Since the webbing 26 can be moved together with the webbing 26 in the webbing pull-out direction to release the webbing holding force, the webbing 26 can be prevented from being broken at the holding portion. Even when the clamping force of the webbing by the clamp mechanism is released, the webbing 26 is prevented from being pulled out via the take-up shaft 4 by the emergency lock mechanism.

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 the webbing tension when the clamp is released becomes sharp. You can prevent the depression. That is, as is clear from the graph of FIG. 11 showing the relationship between the webbing tension F generated on the webbing clamped by the clamp mechanism and the clamp movement amount S in the webbing pull-out direction, it is shown by the solid line in the figure. The webbing tension F acting on the webbing 26 during the operation of the clamp release mechanism of the first embodiment is such that the point O (the state of FIG. 5 (a)) at which the webbing nip begins to be released is completely released (the point of FIG. 5 (b)), it gradually decreases in accordance with the clamp movement amount S within a certain range up to a certain range, and the conventional clamp release mechanism (webbing is applied with a tensile force above a predetermined level) indicated by a broken line in the figure. When it is obtained, the webbing tension F is not rapidly released as in the case of the tooth portion being sheared.

Therefore, during the webbing clamp, the motion energy generated in the body of the occupant due to the collision can be efficiently absorbed, and after the clamp is released, the emergency locking mechanism prevents the take-up shaft 4 from moving in the webbing pull-out direction. When the rotation is locked and the webbing tension rises again, it is possible to prevent a large change in the deceleration that acts on the occupant's body, and a very effective protection function can be exerted.

In addition, the retractor with a clamp of the first embodiment clamps only by deforming the deforming portion 20c of the upper plate 20 so that the sliding contact surface 20a becomes 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 accommodating the retractor, and the vehicle mountability is good. FIG. 7 is an enlarged perspective view of an essential part of a retractor with a clamp according to a second embodiment of the present invention, but detailed description of the same components as those of the first embodiment will be omitted.

The upper plate 40, which is a guide member that constitutes the clamp mechanism of the retractor with a clamp shown in FIG. 7, has a hollow member having a rectangular cross-section with one corner cut out in the longitudinal direction, and the tip extends as a free end. An extended tongue portion 40e is formed at the tip of the main cantilever piece 40d, and a rigid body having a desired rigidity by having a sliding contact surface 40a on the outer surface that is in sliding contact with the flat surface portion 6d of the clamp 6. Is.

Further, the corner portion located on the base end side of the main cantilever piece 40 d is deformed such that the sliding contact surface 40 a is substantially parallel to the webbing facing surface of the clamp 6, and the first plate of the upper plate 40 is deformed. The main cantilever piece 40d bends from the first deformable portion 40c when a load larger than a predetermined value is applied to the free end side of the main cantilever piece 40d. Further, the corner portion of the sub cantilever piece 40f facing the extension tongue portion 40e, which is located on the base end side, is a second deforming portion 40g which is deformed next to the first deforming portion 40c.

The upper plate 40 has both ends fitted into the through holes 52 formed in the opposite side plates 51 a, and then fixed to the mounting plate 19 a of the upper stay 19 to tighten the clamp 6 by webbing. The sliding contact surface 40a for guiding to the engagement position is fixed so as to have a predetermined inclination angle which is close to the lower plate 16 fixed to the base back plate 51b of the base 51 on the upper side.

Next, the operation of the clamp mechanism of the second embodiment will be described. First, when an emergency such as a collision occurs, tension is applied to the webbing 26, and when a turning force in the webbing pull-out direction that is more than a predetermined impact is applied to the winding shaft 4, as shown in FIG. The wedge-shaped clamp 6, which is immediately moved upward along the sliding contact surface 40a of the upper plate 40 by the upper plate 40 and is swung upward against the biasing force of the return spring 15, moves in the webbing clamping direction (arrow W direction). ) And bites between the sliding contact surface 40a and the lower plate 16.

In the clamped state as described above, the impact force at the time of collision becomes excessively large, and a tensile force F of a predetermined value or more acts on the webbing 26, so that the rear end side edge 6e of the clamp 6 becomes a main piece. Since the force acting on the deformable portion 40c to bend the holding piece 40d inward of the upper plate 40 also becomes a load larger than a predetermined value, as shown in FIG. 8 (b), the clamp 6 has the sliding contact surface 40a. The deforming portion 40c is moved in the webbing pull-out direction while being deformed so as to be substantially parallel to the webbing facing surface. Therefore, the extended tongue portion 40e of the main cantilever piece 40d bent inward of the upper plate 40 abuts the tip portion of the sub cantilever piece 40f.

When the pulling force F further acts on the webbing 26, the main cantilever piece 40d tries to bend the sub-cantilever piece 40f inward of the upper plate 40, so that the clamp 6 is deformed by the deformed portion 40c and the deformed portion 40c. The portions 40g are simultaneously deformed and moved in the webbing pull-out direction. Then, as shown in FIG. 8 (c), when the deforming portion 40c and the deforming portion 40g are deformed until the sliding contact surface 40a becomes substantially parallel to the webbing facing surface of the clamp 6, the clamp 6 pulls out the webbing. Since the clamp mechanism is released by allowing the webbing 26 to move in any direction, breakage of the webbing 26 at this sandwiching portion is avoided.

That is, similarly to the clamp mechanism of the first embodiment, the deformation resistance generated when the deformable portion 40c and the deformable portion 40g are deformed in the clamp mechanism of the second embodiment is mediated by the webbing 26. As a result, the kinetic energy of the occupant at the time of a vehicle collision can be effectively consumed, and a sudden drop in the webbing tension when the clamp is released can be prevented.

FIG. 9 is an enlarged perspective view of an essential part of a retractor with a clamp according to a third embodiment of the present invention. The upper plate 60, which is a guide member constituting the clamp mechanism of the retractor with a clamp, has a rectangular cross section. One end of a cantilevered piece 60d, which is formed by cutting out one corner of a hollow member in the longitudinal direction in the longitudinal direction and protruding the tip as a free end, has an extension tongue 60e formed at the outer side surface thereof, and a flat surface portion 6d of the clamp 6 on the outer surface thereof. It is a rigid body that has a sliding contact surface 60a that is in sliding contact with and is given a desired rigidity.

The upper plate 60 has both ends fitted into through holes 63 formed in the opposite side plates 61a, and then fixed to the mounting plate 19a of the upper stay 19 to tighten the clamp 6 by webbing. The sliding contact surface 60a that guides it to the 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 61b of the base 61 on the upper side.

A deforming pin 62, which is inserted through a through hole 64 formed in a side plate 61a facing the upper plate 60, is bridged above the upper plate 60, and the deforming pin 62 has the extending tongue portion 60e. Is located in the swing range of. Next, the operation of the clamp mechanism of the third embodiment will be described. First, when an emergency such as a collision occurs, tension is applied to the webbing 26, and when a rotational force in the webbing pull-out direction that is more than a predetermined impact is applied to the winding shaft 4, as shown in FIG. The wedge-shaped clamp 6, which is immediately moved upward along the sliding contact surface 60 a of the upper plate 60 and swung upward against the urging force of the return spring 15, moves in the webbing clamping direction (arrow W). Direction) and bite between the sliding contact surface 60a and the lower plate 16.

In the clamped state as described above, the impact force at the time of collision becomes excessively large, and a tensile force F of a predetermined value or more acts on the webbing 26, whereby the rear end side edge 6e of the clamp 6 is cantilevered. Since the force acting on the deformable portion 60c when the piece 60d is bent inward of the upper plate 60 becomes a load larger than a predetermined value, as shown in FIG. 10 (b), the clamp 6 has the sliding contact surface 60a. While the deforming portion 60c is deformed so as to be substantially parallel to the webbing facing surface, the moving portion moves in the webbing pull-out direction. Then, the extension tongue portion 60e of the cantilever piece 60d bent inward of the upper plate 60 abuts the deforming pin 62.

When the pulling force F further acts on the webbing 26, the cantilever piece 60d tries to bend the deforming pin 62 forward of the retractor, so that the clamp 6 deforms the deforming portion 60c and the deforming pin 62 at the same time. While moving, move in the webbing pull-out direction. Then, as shown in FIG. 10 (c), when the deforming portion 60c and the deforming pin 62 are deformed until the sliding contact surface 60a becomes substantially parallel to the webbing facing surface of the clamp 6, the clamp 6 becomes Since the clamp mechanism is released by being movable in the webbing pull-out direction, breakage of the webbing 26 at this sandwiching portion is avoided.

That is, similar to the clamp mechanism of the first and second embodiments, the deformation resistance generated when the deforming portion 60c and the deforming pin 62 are deformed in the clamp mechanism of the third embodiment. Can effectively consume the kinetic energy of the occupant at the time of a vehicle collision via the webbing 26, and prevent the webbing tension from dropping sharply when the clamp is released.

Further, a description will be given based on the graph of FIG. 11 showing the relationship between the webbing tension F and the clamp movement amount S in the webbing pull-out direction in the clamp mechanisms of the second and third embodiments. The webbing tension F acting on the webbing 26 during the operation of the clamp release mechanism of the third embodiment starts the deformation of the deforming portion 40g or the deforming pin 62 which is the second deforming portion from the point O at which the clamping of the webbing starts to be released. Up to the point P, there is a tendency to decrease almost like the operation of the clamp releasing mechanism of the first embodiment.

Then, the deformation of the deforming portion 40g or the deforming pin 62 starts from this point P, so that the deforming of the deforming portion 40g or the deforming pin 62 is completed, as indicated by the alternate long and short dash line in the figure. Until the point R is reached, the clamp movement amount S increases while maintaining an appropriate webbing tension F. That is, the clamp mechanisms of the second and third embodiments have finer control over the webbing tension and the amount of clamp movement when the clamp 6 in the clamped state moves in the webbing pull-out direction, as compared with the first embodiment. Is possible, and the degree of freedom in design is improved.

The shape of the guide member and the configuration of 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 provided with other inertial sensing means and locking means.

[0056]

[Effect of device]

 That is, 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 slide contact surface of the guide member of the clamp member becomes substantially parallel to the webbing facing surface of the clamp member. While the deforming portion of the guide member is deformed, the clamp mechanism is released by moving in the webbing pull-out direction, so that the kinetic energy of the occupant is effectively consumed in the process of deforming the deforming portion, and the webbing at the time of releasing the clamp is released. A sudden drop in tension can be prevented.

Further, since the clamp mechanism is released only by deforming the deformable portion of the guide member so 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 released. You don't have to expand. Therefore, it is possible to provide a retractor with a clamp, which has a good vehicle mountability and is capable of efficiently absorbing the motion energy generated in the body of an occupant during 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.

FIG. 6 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. 1.

FIG. 7 is an enlarged perspective view of essential parts of a retractor with a clamp according to a second embodiment of the present invention.

FIG. 8 is an enlarged side 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 perspective view of a main part of a retractor with a clamp according to a third embodiment of the present invention.

FIG. 10 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. 11 is a webbing tension F in the clamp mechanism,
6 is a graph showing a relationship with a clamp movement amount S in a webbing pull-out direction.

[Explanation of symbols]

 1 Base 1a Side plate 1b 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 19 Upper stay 20 Upper plate 20a Sliding surface 20c Deformation part 20d Cantilever piece 26 Webbing 30 Body acceleration detecting means

Claims (1)

[Scope of utility model registration request] 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. It has a deformation section which urchin deformed retractor Clamp, characterized in that the modified shape portion is configured to be deformed with the movement of the webbing pull-out direction of the clamping member.