JPH11180252A - Vehicle body acceleration sensor for seat belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively prevent a seat belt from being mounted in a backward inclined state exceeding an appropriate use range of the seat belt so as to positively prevent an accident caused by the erroneous use of the seat belt in a vehicle body acceleration sensor equipped at a retractor fitted into a seat back. SOLUTION: A vehicle body acceleration sensor 32 rotates a sensor case 36 equipped at a retractor 100 in a seat back, around its rotation axis in response to tilting of the seat back through a transmission means 39 so that the direction of an inertia body support face 36a of the sensor case 36 is appropriately held regardless of the inclined state of the seat back. The vehicle body acceleration sensor 32 is provided with lock operating mechanism 38 for operating a locking means of the retractor 100 for a seat belt when the seat back is tilted exceeding an appropriate use range of the seat belt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body acceleration sensor for a seatbelt, and more particularly to a seatbelt retractor mounted in a seatback of a reclining type seat of a vehicle or the like to prevent extension of a webbing in an emergency. The present invention relates to an improvement of a vehicle body acceleration sensor for a seat belt that activates a locking means to be activated.

[0002]

2. Description of the Related Art Conventionally, a seatbelt device for securely holding a vehicle occupant or the like in a seat has a retractor physically locked by an inertial sensing means that responds to sudden acceleration, collision or deceleration in a vehicle emergency. An emergency lock type retractor that has an emergency lock mechanism to effectively and safely restrain an occupant is used. Inertia sensing means used in such an emergency lock type retractor includes, for example, FIG.
As shown in FIG. 1, there is a vehicle body acceleration sensor 2 for detecting the vehicle body acceleration.

The vehicle body acceleration sensor 2 has a sensor case 4 having an inertial body support surface 3 on which a spherical inertial body 1 is mounted, and an operation in which the inertial body 1 moves on the inertial body support surface 3. A sensor arm 6 is provided on the upper part of the inertial body 1 so as to be swingable in order to operate a locking means of the emergency locking mechanism. The inertial body support surface 3 has a mortar shape with an inclination angle α so that the inertial body 1 does not move carelessly until the acceleration acting on the inertial body 1 due to a collision or inclination of the vehicle body exceeds a predetermined value. Is formed.

Recently, a retractor is mounted in a seatback (seat backrest) of a reclining type seat of a vehicle or the like, and a vehicle body acceleration sensor for a seatbelt is provided which can operate similarly even if the inclination of the seatback is changed. Various seat bell devices have been proposed in US Pat. No. 5,622,383. For example, as in a seatbelt device 14 shown in FIG. 24, a seatbelt retractor 9 around which a webbing 8 is wound is mounted in a seatback 12 of a reclining type seat 11.
Also, the webbing 8 pulled out from the retractor 9
Is extended to the front side of the seat back 12 from a slit 15 formed at a shoulder anchor position (a portion where the webbing near the shoulder extends) of the seat back 12, and the rotation of the seat back 12 on the side surface of the seat. Anchor plate 1 pivotally supported near the central adjustment axis
7. Then, a slutung 18 movably disposed at a webbing intermediate portion between the anchor plate 17 and the slit 15 is coupled to a buckle (not shown) provided upright at a substantially central portion of the vehicle body, thereby allowing the occupant to seat the seat 11. To be restrained.

Further, in the vehicle body acceleration sensor 2 of the retractor 9 mounted in the seat back 12 as described above, the orientation of the inertial body support surface 3 on the sensor case 4 is independent of the inclination of the seat back 12. A transmission means 20 such as a flexible shaft or a gear device for rotating the sensor case 4 in conjunction with the tilt of the seat back 12 is appropriately provided so as to be properly maintained. In the seat belt device 14 having such a configuration, even if the inclination state of the seat back 12 is changed or the seat 11 is slid back and forth, the positional relationship between the shoulder belt of the webbing 8 and the seat back 12 does not change, and a favorable The restraint performance can be maintained.

[0006]

By the way, as shown in FIG. 25, the seat back 12 of the reclining type seat has a full surface in which the surface of the seat back 12 extends substantially horizontally to the seat surface of the seat seat portion 22. It is not unusual to move from the flat position to the forward position. When the retractor 9 is built in the seat back 12 as in the seat belt device 14, the shoulder anchor position moves together with the reclining of the seat back 12, and the shoulder belt is always occupied regardless of the reclining position. Since the occupant is disposed at the position of the chest, the occupant may expect the restraint performance of the seat belt.

However, when the seat back 12 is tilted backward beyond the proper use range S of the seat belt,
In the event of a collision, the occupant's body passes under the webbing 8,
The so-called submarine phenomenon of jumping out and jumping forward easily occurs. In particular, the seat belt device 14
When the shoulder belt is always arranged at the position of the occupant's chest as in the above, there is a possibility that the webbing 8 may be hung on the occupant's neck when the submarine phenomenon occurs, and the proper use range S of the seat belt is exceeded. It is preferable not to fasten the seat belt when the seat back 12 is tilted backward.

Therefore, in order to prevent such an accident, the operation (angle adjustment operation) of the transmission means 20 for rotating the vehicle body acceleration sensor 2 in conjunction with the tilt of the seat back 12 is restricted, and the seat belt is moved. It is conceivable that the angle adjustment of the vehicle body acceleration sensor 2 is linked to the tilt of the seat back 12 only within the proper use range S. When such measures are taken, when the seat back 12 is tilted backward to the limit of the proper use range S of the seat belt, the angle adjustment of the vehicle body acceleration sensor 2 is stopped, and the seat back 1 is no longer adjusted.
When the vehicle body 2 is tilted backward, the sensor case 4 of the vehicle body acceleration sensor 2 is tilted and the inertial body 1 moves, so that the locking means of the retractor 9 is activated and the webbing 8 cannot be pulled out. Therefore, even if the user tries to fasten the seat belt with the seat back 12 tilted backward beyond the proper use range S, the webbing 8 cannot be pulled out. It can be prevented beforehand.

However, it is not sufficient to limit the angle adjustment of the vehicle body acceleration sensor 2 in conjunction with the tilting of the seat back 12 during the tilting of the seat belt within the proper use range S. That is, as shown in FIG. 23, the inertial body support surface 3 of the conventional vehicle body acceleration sensor 2 has an angle α
Even if the seat back 12 is tilted beyond the proper use range S of the seat belt, the inertial body 1 does not move until the sensor case 4 is tilted by the angle α or more. Therefore, even if the seat back 12 is tilted to the rearward tilt limit of the proper use range S of the seat belt, the drawer of the webbing 8 is not locked immediately.

Then, the inclination angle of the seat back 12 reaches the rear inclination limit of the proper use range S of the seat belt, and the angle of the seat back 12 from when the angle adjustment of the sensor case 4 stops until the sensor case 4 inclines by the angle α or more. The actual inclination angle varies under the influence of the inclination state of the vehicle body and the like. Therefore, when the angle adjustment of the vehicle body acceleration sensor 2 is linked to the tilt of the seat back 12 only within the proper use range S of the seat belt as described above, it is unclear whether or not the drawer of the webbing 8 is locked. When a gray zone exists and the inclination angle of the seat back 12 is in the gray zone, there is a possibility that the seat belt may be erroneously worn.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a vehicle body acceleration sensor mounted on a retractor mounted in a seat back, wherein the vehicle body is in a backwardly inclined state beyond a proper use range of a seat belt. Accordingly, it is an object of the present invention to provide a vehicle body acceleration sensor for a seat belt, which can surely prevent a seat belt from being worn, and can surely prevent an accident due to incorrect use of the seat belt.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a retractor base mounted on a seat back of a reclining type seat of a vehicle or the like, a winding shaft rotatably supported by the base, and a rotating shaft. A sensor case movably supported by a retractor base, a first position for actuating a lock means for locking the rotation of the winding shaft of the seat belt retractor in the webbing withdrawal direction, and not actuating the lock means; A sensor arm rotatably attached to the sensor case or the retractor base to be located at the second position, and relative movement on the inertial body support surface of the sensor case when a speed change of not less than a predetermined value is received; An inertial body that moves the sensor arm to the first position, and the direction of the inertial body support surface is inclined with respect to the seat back. Transmission means for interlocking the sensor case in accordance with the inclination angle of the seat back so as to be properly maintained, and the locking means is moved by the inertial body when a predetermined vehicle acceleration is applied. A vehicle acceleration sensor for a seat belt to be actuated, comprising: a lock actuation mechanism for actuating the locking means when the seat back is tilted beyond a proper use range of the seat belt. This is achieved by a vehicle body acceleration sensor for a belt.

According to the above construction, when the reclining angle of the seat back of the reclining type seat reaches the reclining limit of the proper use range of the seat belt, the lock means for locking the rotation of the winding shaft in the webbing withdrawing direction is provided. Activated by the lock operation mechanism, the drawer of the webbing can be quickly and reliably locked regardless of the inclination state of the sensor case. Accordingly, when the seat back is tilted backward beyond the proper use range of the seat belt, the wearing of the seat belt is reliably prevented.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a vehicle body acceleration sensor for a seat belt according to an embodiment of the present invention. As shown in FIG. 1, a seat belt retractor 100 including a vehicle body acceleration sensor 32 according to the first embodiment of the present invention is mounted in a seat back 62 of a reclining type seat 61 mounted on a vehicle body. . The seat back 62 is connected to the seat portion 63 so as to be able to pivot about an adjustment shaft (adjustment axis of the seat back) 71 extending in the width direction of the vehicle body. The tilt angle is adjusted.

The reclining range (tilting range) of the seat back 62 is a maximum after the front tilting state A shown in the drawing becomes a full flat state in which the surface of the seat back 62 extends substantially horizontally with the surface of the seat seat 63. Up to the tilt state D. The suitable inclination angle of the seat back 62 when the occupant is traveling the vehicle is from the inclined state B in which the seat back 62 is slightly inclined backward from the vertical direction to the inclined state C in which the seat back 62 is inclined backward by an appropriate amount. The range from the inclined state B to the inclined state C is a proper use range S of the seat belt in which the restraint performance for the occupant can be normally exhibited.

The seat belt retractor 100
Although not shown in detail, a substantially cylindrical take-up shaft on which the webbing 70 is wound and rotatably supported by the retractor base 23, and a webbing withdrawal direction of the take-up shaft in a vehicle emergency. Emergency lock mechanism 300 for preventing rotation
And Then, the webbing 70 extending from the retractor 100 through the slot 64 formed in the seat back 62 restrains the occupant to the seat.

The retractor base 23, which is fixed to a frame member (not shown) of the seat back 62,
A metal plate is press-formed so that most of it has a U-shaped cross section, and the winding shaft is rotatably inserted into openings provided at opposing positions of the left and right side plates 23a and 23b. . A known take-up spring device (not shown) that constantly biases the take-up shaft in the webbing take-up direction is provided at the other end of the take-up shaft through which the side plate 23b of the retractor base 23 is inserted.
Is equipped.

In the present invention, various known structures can be employed as the specific structure of the emergency lock mechanism 300 for restraining the take-up shaft from rotating in the webbing withdrawing direction in the event of a vehicle emergency. For example, in the case of the present embodiment, the ratchet wheel 24 serving as the lock operating means causes a rotation delay with respect to the take-up shaft, so that the ratchet wheel 24 can swing freely to one end of the take-up shaft as the lock means. A pivotally supported pole (not shown) is engaged with the engaged portion of the retractor base 23 to prevent the winding shaft from rotating in the webbing withdrawing direction.

Below the ratchet wheel 24,
The vehicle body acceleration sensor 32 according to the first embodiment of the present invention is provided. As shown in FIGS. 4 and 5, the vehicle body acceleration sensor 32 of the first embodiment
1, a sensor case 36, an inertial body 33, a case support member 37, a lock arm 34, a transmission means 39, and a lock operation mechanism 38.

The sensor case 36 includes the inertial body 3
3 has an inertial body support surface 36a on which the sensor arm 3 is mounted, and an arm support portion 36b for rotatably supporting the sensor arm 31. The inertial body support surface 36a of the sensor case 36 is connected to the inertial body support surface 3 shown in FIG.
And a mortar shape depressed toward the center at an inclination angle α.

The case supporting member 37 includes a case supporting portion 40 to which the sensor case 36 is detachably attached by being fitted therein, and a case supporting member 37 extending upward from one side surface of the case supporting portion 40 to adjust the rotation axis of the winding shaft. This is a structure having a shaft support portion 41 rotatably supported as a center and a tongue-like connection portion 42 extending radially outward from the shaft support portion 41. The connecting portion 42 is connected to a transmitting means 39 described later, and when the seat back 62 is tilted, the case supporting member 37 is rotated by the transmitting means 39 in conjunction with the tilt of the seat back 62.

The sensor arm 31 has a shaft portion on the base end side rotatably supported by the sensor case 36. When the sensor case 36 is mounted on a retractor, the sensor arm 31 is attached to the side plate 23a by a support pin 34a. The lock means is operated via a lock arm 34 which is rotatably supported. That is, the sensor arm 31 is configured such that the distal end portion 31b pushes the lock arm 34 toward the ratchet wheel 24 and engages the swinging end portion of the lock arm 34 with the teeth 24a of the ratchet wheel 24, thereby winding the sensor arm 31. From a first position for actuating locking means for locking rotation of the shaft in the webbing withdrawal direction,
The distal end portion 31b is separated from the lock arm 34 and the pivot end of the lock arm 34 is detached from the teeth 24a, so that the distal end portion 31b can be pivotally displaced to a second position where the lock means is not operated. Further, the sensor arm 31 is integrally formed with a saucer-shaped contact portion 31c that comes into contact with the upper portion of the inertial body 33 to detect the movement of the inertial body 33.

In the present invention, the "lock means"
From the emergency lock mechanism 300 to the vehicle body acceleration sensor 32
Means those without. The inertial body 33 has a spherical shape. When the inertial body 33 is placed on the inertial body support surface 36a and receives a speed change of a predetermined value or more, the inertial body support surface 36a
a, and the sensor arm 31 circumscribing the inertial body 33 is moved to the first position.

Therefore, the sensor arm 31 moves the swinging end of the lock arm 34 to the teeth 2 of the ratchet wheel 24.
4a, the ratchet wheel 24 causes a rotation delay with respect to the winding shaft. Therefore, the pawl supported at one end of the winding shaft engages with the engaged portion of the retractor base 23. The locked state of the locking means is combined, and rotation of the winding shaft in the webbing withdrawing direction is prevented.

The transmission means 39 is provided on the inertial body support surface 3.
The sensor case 36 is moved via the case supporting member 37 in accordance with the inclination angle of the seat back 62 so that the direction of 6a is maintained properly (upward in the vertical direction) regardless of the inclination state of the seat back 62. It is rotated around the rotation axis. The case support member 37 connected to the transmission means 39 does not rotate around the rotation axis due to the inertial force acting upon a vehicle collision or the like.

As shown in FIGS. 2 and 3, the transmission means 39 includes a cam plate 50 fixed to the seat seat 63 side.
And a wire 46 as a transmitting member that moves the sensor case 36 around the rotation axis only in the rotatable range by following the cam surface of the cam plate 50, and slidably accommodates the wire 46. And a guide cylinder 45 provided in the seat back 62. As shown in FIG. 4, a slider 48 connected to the retractor-side end of the wire 46 is connected to a connecting portion 42 of the case support member 37 at the retractor-side end 45 a of the guide cylinder 45 through which the wire 46 is inserted. A guide member 60 fixed to the side plate 23a of the retractor base 23 is mounted so as to pass through the periphery.
The retractor side end of the wire 46 is connected to the connecting portion 4.
An engagement pin 48a that engages with the two long holes 42a is connected to the case support member 37 via a slider 48 that is protruded.

The cam plate side end 45b of the guide cylinder 45 is also provided.
As shown in FIGS. 2 and 3, the follower 47 connected to the cam plate side end of the wire 46 is positioned and fixed to the seat back 62 such that the follower 47 extends toward the cam surface of the cam plate 50. Have been. Then, the cam plate 50 fixed to the seat seat 63 is attached to the follower 47 by the seat back 6.
2 is given a displacement corresponding to the inclination.

The cam plate side end 45b of the guide cylinder 45
Is located at a predetermined distance from the adjustment shaft 71.
3 and fixed on the sheet 62 as shown in FIG.
When the back 62 tilts, the seat 62 is adjusted integrally with the seat back 62.
An arc R of a predetermined radius from the node shaft 71 ₁Move up. In FIG.
The position A of the cam plate side end 45b of the guide cylinder 45₁
In the figure, the seat back 62 is tilted forward as shown in FIG.
A, and similarly, the cam plate side end 45b
Position B₁Shows the tilted state of the seat back 62 in FIG.
Of the seat belt, which is the starting position of the proper use range S,
In the state B, the position C of the cam plate side end 45b₁
Is the seat back shown in FIG.
When the tilt state C is the end position of the proper use range S of the default
The position D of the cam plate side end 45b₁Is the seat bar
When the hook 62 is in the maximum backward tilt state D shown in FIG.
belongs to.

[0029] The follower 47 coupled to the cam plate side end portion of the wire 46, so as to protrude by a predetermined length L ₁ in the regulation shaft 71 side from the open end of the cam plate side end portion 45b, not shown 2 is urged in the direction of the arrow (a) in FIG. The cam plate 50 is fixed to the seat portion 63 side, and is displaced to the tip of the follower 47 projecting toward the adjustment shaft 71 when the seat back 62 is tilted in the proper use range S of the seat belt. And a regulating cam surface 50b for preventing displacement of the follower 47 when the seat back 62 is tilted backward beyond the proper use range S of the seat belt. .

When the seat back 62 is inclined from the start position to the end position of the proper use range S of the seat belt, the follower 47 projecting toward the adjustment shaft 71 when the seat back 62 is tilted. Is a cam surface with which the wire 46 is displaced in the axial direction in accordance with the inclined state of the seat back 62. Then, the wire 46 displaced by the angle adjusting cam surface 50a rotates the case support member 37 around the winding axis which is the rotation axis thereof via the slider 48, and the inertia of the sensor case 36 Body support surface 36
Adjust the direction of a.

When the seat back 62 is tilted forward to the front of the vehicle body from the start position of the proper use range S of the seat belt, the seat belt is not used and the sensor case 36 is not used.
There is no need to adjust the angle. Therefore, the follower 47
Is separated from the above-described angle adjusting cam surface 50a,
The driven Doko 47 does not perform the angular adjustment of the sensor case 36 by maintaining the initial projection length L _1.

The regulating cam surface 50b is provided with a seat back.
62 is tilted backward beyond the proper use range S of the seat belt.
When the follower 47 is in the proper use range of the seat belt.
Sensor that keeps the displacement state when it reaches the end position of S
The angle adjustment of the case 36 is avoided.
Arc R at which the open end of the cam plate side end 45b of the cam 45 moves ₁
It is formed on an arcuate cam surface concentric with. So, Sea
The seat back 62 is tilted out of the proper use range of the belt.
When made, the sensor case by the transmission means 39
Since the angle adjustment of 36 is not performed, the sensor case 36
The ground angle of the retractor is set by the tilt of the seat back 62.
-It changes together.

As shown in FIG. 4, the lock actuating mechanism 38 has an intermediate portion pivotally supported by a side plate 23a of the retractor base 23 by a support pin 53, and has a ratchet wheel 24 at one end. An engagement lever 54 formed with an engagement claw 54a engageable with the teeth 24a, a return spring 55 for urging the engagement lever 54 in a direction in which the engagement claw 54a is disengaged from the ratchet wheel 24, The transmission means 39 is mounted on the case support member 37,
When the case supporting member 37 is rotated counterclockwise in FIG. 4 to a predetermined position, the case supporting member 37 comes into contact with the other end of the engaging lever 54 to engage the engaging claw 54a with the teeth 24a of the ratchet wheel 24. And an operation unit 56 to be combined. The amount of swing of the engagement lever 54 in the direction in which the engagement claw 54a is separated from the ratchet wheel 24 is regulated by a stopper pin 59 protruding from the side plate 23a.

The operating portion 56 comes into contact with the other end of the engaging lever 54 when the seat back 62 is tilted backward to a position slightly below the backward tilt limit of the proper use range S of the seat belt, and When the back 62 is tilted backward, as shown in FIG. 5, the other end of the engagement lever 54 is pressed and urged in accordance with the rotation of the case support member 37 by the transmission means 39, and the engagement claw 54a is moved. The engagement lever 54 is rotated in the direction of engagement with the ratchet wheel 24 against the urging force of the return spring 55.

When the seat back 62 is tilted backward to the rearward tilt limit of the proper use range S of the seat belt, the operating portion 56 is engaged so that the engaging claws 54a are engaged with the teeth 24a. Swings the engagement lever 54. When the engaging claw 54a engages with the teeth 24a of the ratchet wheel 24, the other end of the engaging lever 54 comes into contact with a stopper pin 58 protruding from the side plate 23a to swing. As it is regulated, ratchet wheel 2
4 can be firmly pushed back, and the ratchet wheel 2 in the webbing withdrawal direction is
4 can be reliably prevented.

A cushion plate 56a is provided at a portion of the operation portion 56 which comes into contact with the engagement lever 54, and is constantly biased toward the engagement lever 54 by a spring 56b which is an elastic member. I have. Therefore, when the engagement lever 54 hits the tooth tip of the ratchet wheel 24, an excessive load is applied to the other components such as the engagement lever 54 and the case supporting member 37 by compressing the spring 56b. It is prevented from joining.

That is, the lock operation mechanism 38 moves beyond the proper use range S of the seat belt and the seat back 62.
By engaging the engagement lever 54 with the ratchet wheel 24 when is tilted backward, the sensor arm 31
The locking means of the emergency lock mechanism 300 can be operated irrespective of the movement of the lock. Therefore, in the vehicle body acceleration sensor 32 according to the first embodiment described above, the rearward tilt angle of the seat back 62 of the reclining type seat 61 is determined after the proper use range S of the seat belt in which the occupant restraint performance can be normally exhibited. When the inclination limit is reached, lock means for locking the rotation of the winding shaft of the retractor 100 in the webbing withdrawing direction is operated by the lock operation mechanism 38,
The drawer of the webbing is quickly and reliably locked regardless of the inclination state of the vehicle body.

Therefore, when the seat back 62 is tilted rearward beyond the proper use range S of the seat belt, the pull-out of the webbing is securely locked by the lock operation mechanism 38, so that the seat belt is not worn. Thus, it is possible to reliably prevent accidents caused by incorrect use of the seat belt.

FIGS. 6 and 7 are schematic side views of a seatbelt retractor 101 provided with a vehicle body acceleration sensor 132 according to a second embodiment of the present invention. FIG. FIG. 7 shows the position of the sensor case 36 and the state of the lock operation mechanism 138 when the sensor case 36 has reached just before the rearward limit position of the range S. FIG.
2 shows the position of the sensor case 36 and the state of the lock operation mechanism 138 when the seat belt 2 is tilted backward beyond the backward tilt limit position of the appropriate use range S of the seat belt.

In the case of the retractor 101 of the second embodiment, the configuration other than the vehicle body acceleration sensor 132 is the same as that of the retractor 100 of the first embodiment, and a detailed description is omitted. Further, in the vehicle body acceleration sensor 132 according to the second embodiment, the operation unit 149 is extended to the tip of the slider 148 coupled to the retractor side end of the wire 46 that is displaced in the longitudinal direction in accordance with the tilt of the seat back 62. When the seat back 62 is tilted beyond the proper use range S of the seat belt, the lock operation mechanism 138 that activates the locking means of the retractor is driven by the operation unit 149. The other configuration is substantially the same as the vehicle body acceleration sensor 32 of the first embodiment.

As shown in FIG. 6, the lock operation mechanism 138 has an intermediate portion pivotally supported by a side plate 23a of the retractor base 23 by a support pin 153, and
An engagement lever 154 having an engagement claw 154a formed at one end thereof for engagement with the teeth 24a of the ratchet wheel 24.
And a return spring 155 for urging the engagement lever 154 in a direction in which the engagement claw 154a is disengaged from the ratchet wheel 24, and is engaged with an engagement arm 154b formed at the other end of the engagement lever 154. And the operating portion 149 capable of swinging the engagement lever 154. The amount of swing of the engagement lever 154 in the direction in which the engagement claw 154a is disengaged from the ratchet wheel 24 is restricted by a stopper pin 159 protruding from the side plate 23a.

Then, the seat back 62 is positioned at the rearward tilt limit position (the tilted state C in FIG.
7), the operating portion 149 of the slider 148 is moved to the engagement lever 1 as shown in FIG.
54 by pressing the engagement arm 154b.
4 is engaged with the teeth 24 of the ratchet wheel 24.
a. The engagement lever 15
4 is made of synthetic resin, and the engagement lever 154
When the engaging claw 154a of the collides with the tip of the ratchet wheel 24, the engaging lever 154 side is elastically deformed, so that an unreasonable load is applied to other components such as the ratchet wheel 24 and the slider 148. Can be prevented.

When the engaging claw 154a engages with the teeth 24a of the ratchet wheel 24, the engaging arm 154b of the engaging lever 154 comes into contact with a stopper pin 158 projecting from the side plate 23a. The engagement lever 1 pushed by the ratchet wheel 24
54 can be firmly pushed back, and the rotation of the ratchet wheel 24 in the webbing withdrawing direction can be reliably prevented.

That is, the lock operation mechanism 138 moves the seat back 6 beyond the proper use range S of the seat belt.
When the lever 2 is tilted backward, the locking means of the emergency lock mechanism 300 can be operated independently of the movement of the sensor arm 31 by engaging the engagement lever 154 with the ratchet wheel 24. Therefore, the vehicle body acceleration sensor 132 according to the second embodiment can also obtain the same operation and effect as the vehicle body acceleration sensor 32 according to the first embodiment. Further, the urging force of the return spring 155 for urging the engagement lever 154 in a direction away from the ratchet wheel 24 can also be used as means for urging the wire 46 of the transmission means 39 toward the adjustment shaft 71. Can also be reduced.

FIGS. 8 and 9 are schematic side views of a seatbelt retractor 102 having a vehicle body acceleration sensor 232 according to a third embodiment of the present invention. FIG. FIG. 9 shows the position of the sensor case 36 and the state of the lock operation mechanism 238 when the position reaches just before the rearward tilt limit position of the range S. FIG.
2 shows the position of the sensor case 36 and the state of the lock operation mechanism 238 when the seat belt 2 is tilted backward beyond the backward tilt limit position of the appropriate use range S of the seat belt.

In the case of the retractor 102 of the third embodiment, the configuration other than the vehicle body acceleration sensor 232 is the same as that of the retractor 100 of the first embodiment, and the seat back exceeds the proper use range S of the seat belt. The lock operation mechanism 238 for operating the retractor locking means when the 62 is tilted is changed, and the lock arm 34 used in the vehicle body acceleration sensor 32 of the first embodiment is omitted, and the sensor case 36 is omitted. The configuration is substantially the same except that the sensor arm 31 itself oscillated by the movement of the upper inertia body 33 directly engages with the teeth 24a of the ratchet wheel 24, and a detailed description thereof will be omitted.

As shown in FIG. 8, the lock operation mechanism 238 is provided when the seat back 62 is tilted rearward to the rearward tilt limit position (the tilted state C in FIG. 1) of the proper use range S of the seat belt. As shown in FIG.
6 is moved toward the ratchet wheel 24 by the operation lever 254 waiting in front of the sensor arm 31 having moved together with the inertia body 33.
Of the sensor arm 31 regardless of the movement of the
b is engaged with the teeth 24 a of the ratchet wheel 24.

The operation lever 254 has an intermediate portion rotatably supported by a side plate 23a of the retractor base 23 by a support pin 253, and has a distal end 31b of the sensor arm 31 at one end thereof on the side of the ratchet wheel 24. Inclined surface 254a is formed. In addition, the operation lever 254 is restricted from rotating clockwise in FIG. 9 by a stopper 258 protruding from the side plate 23a, and maintains a state in which the operation lever 254 contacts the stopper 258. Return spring 255 for urging
Is equipped.

With the provision of the return spring 255, the operation lever 254 can rotate in a direction away from the stopper 258 when a load of a certain degree or more is applied to the inclined surface 254a. The shock at the time of colliding with the 254a is absorbed, so that an excessive load is prevented from being applied to the other components such as the operation lever 254 and the sensor arm 31. Note that the operation lever 254 is formed of an elastic material, and
May be configured so as to avoid applying an excessive force at the time of collision. Therefore, the vehicle body acceleration sensor 232 according to the third embodiment can also obtain the same operation and effect as the vehicle body acceleration sensor according to each of the above embodiments.

FIG. 10 is a schematic side view of a seat belt retractor 103 provided with a vehicle body acceleration sensor 332 according to a fourth embodiment of the present invention. The position of the sensor case 336 and the state of the lock operation mechanism 338 when the position reaches just before the position are shown.

In the case of the retractor 103 of the fourth embodiment, the configuration other than the vehicle body acceleration sensor 332 is the same as that of the retractor 100 of the first embodiment, and a detailed description is omitted. Body acceleration sensor 33 of the fourth embodiment
2, the sensor case 336 includes a case support member 337 fixed on the side plate 23 a of the retractor base 23.
Is rotatably supported around a rotation shaft 336c.
The rotation shaft 336c is set to pass through the center of the inertial body 33. The sensor arm 431 that engages with the ratchet wheel 24 by the movement of the inertial body 33 placed on the inertial body support surface 336a of the sensor case 336 to operate the lock mechanism is provided by the case support member 33.
7 is rotatably supported around a rotation shaft 337a.

When the seat back 62 tilts in the proper use range S of the seat belt, the transmission means 339 for adjusting the angle of the sensor case 336 according to the tilt angle of the seat back 62 is provided in accordance with the tilt of the seat back 62. The point displaced in the longitudinal direction by the cam plate 50 via the wire 346 which is a flexible transmission member displaced in the same manner as the above embodiments is common. However, the wire 3
46 is transferred to the sensor case 336 via an engagement arm 336b protruding from the sensor case 336 and a holding member 348 fixed on the wire 346 and holding the engagement arm 336b in a swingable manner. To be transmitted.

Further, an operating member 354 is connected to the retractor side end of the wire 346 which is displaced in the longitudinal direction in accordance with the tilting of the seat back 62, and the operating member 354 exceeds the proper use range S of the seat belt. A lock operating mechanism 338 for operating the locking means of the retractor when the back 62 is tilted backward is configured. The operation member 354
Is provided with an engagement claw 354a that can be engaged with the teeth 24a of the ratchet wheel 24. Further, a guide member 355 slidably supporting the operation member 354 so that the engagement between the engagement claw 354a and the ratchet wheel 24 is not released by the bending deformation of the base of the operation member 354.
Are disposed on the side plate 23a.

The operation member 354 is designed to have an appropriate elasticity so that even if the engaging claw 354a hits the tooth tip of the ratchet wheel 24, other components such as the ratchet wheel 24 and the wire 46 can be used. It can be prevented that an unreasonable load acts on the vehicle. In other words, the lock operation mechanism 338 is provided for the seat belt proper use range S.
When the seat back 62 is tilted rearward beyond the position, the engaging claw 354a of the operating member 354 is
By engaging with the lock 4, the lock means of the emergency lock mechanism 300 can be operated independently of the movement of the sensor arm 31. Therefore, the vehicle body acceleration sensor 332 according to the fourth embodiment can also obtain the same operation and effects as those of the vehicle body acceleration sensor according to each of the above embodiments.

FIG. 11 is a schematic side view of a seat belt retractor 104 provided with a vehicle body acceleration sensor 432 according to a fifth embodiment of the present invention. The position of the sensor case 436 and the state of the lock operation mechanism 438 when reaching just before the position are shown. Retractor 1 of the fifth embodiment
In the case of 04, the configuration other than the vehicle body acceleration sensor 432 is the same as that of the retractor 100 of the first embodiment, and a detailed description is omitted.

Further, in the vehicle body acceleration sensor 432 of the fifth embodiment, the sensor case 436 is rotatably mounted on a case support member 437 fixed on the side plate 23a of the retractor base 23 around a rotation shaft 436c. The rotation shaft 436 c is supported so as to pass through the center of the inertial body 33. In addition, the sensor arm 531 that engages with the ratchet wheel 24 by operating the inertial body 33 placed on the inertial body support surface 436a of the sensor case 436 and operates the lock mechanism rotates the case support member 437. It is supported rotatably about a shaft 437a.

Further, a flexible shaft 46 which is a flexible transmission member driven to rotate in accordance with the tilt of the seat back 62.
4 is provided with a holding member 484 that moves forward and backward on the flexible shaft 464 by the torsional rotation of the flexible shaft 464 at the retractor side end. The sensor case 436 is provided with an engaging arm 436b which is slidably held by the holding member 484. When the holding member 484 is displaced in the longitudinal direction of the flexible shaft 464, the arm 436b responds accordingly. And the sensor case 436 is
Rotating around 36c, the direction of the inertial body support surface 436a of the sensor case 436 is angle-adjusted.

The transmitting means 439 for adjusting the angle of the sensor case 436 in accordance with the tilt of the seat back 62 is provided with the flexible shaft 46 as shown in FIGS.
4, the holding member 484, and the adjusting shaft 7 of the seat back 62.
1 and a fixed bevel gear 504 fixed to the seat portion 63 with the central axis coincident with 1 and connected to the end of the flexible shaft 464 on the adjustment shaft 71 side via a buffer spring member 564 to fix the fixed bevel gear 504. Drive bevel gear 584 that meshes with bevel gear 504
It is composed of The holding member 484 is threadedly engaged with a feed screw portion 464 a formed on the flexible shaft 464, and advances on the feed screw portion 464 a in accordance with the amount of twist rotation of the flexible shaft 464. .

That is, in the transmitting means 439 of the fifth embodiment, when the seat back 62 is tilted, the flexible shaft 464 is torsionally driven by the driving bevel gear 584 rolling on the fixed bevel gear 504. , This flexible shaft 46
The rotation of the sensor case 436 is performed by the longitudinal displacement of the holding member 484 according to the amount of twist rotation of the sensor case 436. When the seat back 62 is tilted backward beyond the proper use range S of the seat belt, the sensor case 43
A stopper 494 for stopping the holding member 484 is provided at the open end of the guide cylinder 45 on the retractor side so that the angle adjustment of Step 6 is canceled. After the holding member 484 contacts the stopper 494, the relative rotation between the driving bevel gear 584 and the flexible shaft 464 is allowed by the buffer spring member 564, and the holding member 484 and the flexible An excessive load is prevented from acting on the flexible shaft 464.

Further, in the fifth embodiment, the support pins 45
3, the engagement lever 454 rotatably suspended on the side plate 23a is moved to the proper use range S of the seat belt.
Operating mechanism 43 for operating the locking means of the retractor when the seat back 62 is tilted backward beyond
8. Ratchet wheel 24
A weight 454a is attached to the engagement lever 454 disposed diagonally above the rear end of the retractor base 23 so that even if the inclination of the retractor base 23 changes due to the inclination of the seat back 62, the front end portion is directed in the vertical direction. It rotates around the support pin 453 by its own weight. Therefore, when the seat back 62 is tilted to the rearward tilt limit of the proper use range S of the seat belt,
The tip of the engagement lever 454 engages with the teeth 24a of the ratchet wheel 24 to activate the locking means.

That is, the lock operation mechanism 438 moves the seat back 6 beyond the proper use range S of the seat belt.
When the lever 2 is tilted backward, the tip of the engagement lever 454 is engaged with the ratchet wheel 24, so that the locking means of the emergency lock mechanism 300 can be operated independently of the movement of the sensor arm 531. it can. Therefore, the vehicle body acceleration sensor 332 according to the fifth embodiment can also obtain the same operation and effect as the vehicle body acceleration sensor according to each of the above embodiments.

FIG. 13 is a schematic side view of a seat belt retractor 105 provided with a vehicle body acceleration sensor 532 according to a sixth embodiment of the present invention. The position of the sensor case 536 and the state of the lock operation mechanism 538 when the position reaches just before the position are shown. In the case of the seatbelt retractor 105 of the sixth embodiment, the vehicle body acceleration sensor 532
Structures other than the above are the same as those of the retractor 100 of the first embodiment, and a detailed description thereof will be omitted.

In the vehicle body acceleration sensor 532 of the sixth embodiment, the transmission means 439 for adjusting the angle of the sensor case 536 in accordance with the tilt of the seat back 62 is the same as that of the fifth embodiment. I have.
Further, the mechanism by which the transmission means 439 rotates the sensor case 536, the support structure of the sensor arm 531 and the like are completely the same as those in the above-described fifth embodiment.

The sensor case 536 according to the sixth embodiment is integrally formed with an engagement lever 545 whose front end can be engaged with the teeth 24a of the ratchet wheel 24, and the engagement lever 545 exceeds the proper use range S of the seat belt. Thus, a lock operating mechanism 538 for operating the locking means of the retractor when the seat back 62 is tilted rearward. Accordingly, the transmission means 439 adjusts the angle of the sensor case 536 in accordance with the tilt of the seat back 62, and at this time, the engagement lever 545 also moves the sensor case 536.
It is rotated integrally with 36. When the seat back 62 is tilted to the rearward tilt limit of the proper use range S of the seat belt, the distal end of the engagement lever 545 engages with the teeth 24a of the ratchet wheel 24, and the locking means of the retractor operates. Operate.

That is, the lock operation mechanism 538 moves beyond the proper use range S of the seat belt and
By engaging the tip of the engaging lever 545 with the ratchet wheel 24 when the lever 2 is tilted backward, the locking means of the emergency lock mechanism 300 can be operated independently of the movement of the sensor arm 531. it can. Therefore, also in the sixth embodiment, the same operation and effect as those of the fifth embodiment can be obtained. In addition, the lock operation mechanism 5
Since the engagement lever 545 functioning as 38 is formed integrally with the sensor case 536, the number of parts can be reduced and cost can be reduced.

FIG. 14 is a schematic side view of a seat belt retractor 106 having a vehicle body acceleration sensor 632 according to a seventh embodiment of the present invention. The position of the sensor case 36 when it reaches just before the position and the lock operation mechanism 6
38 shows the state of FIG. The vehicle body acceleration sensor 63 in the seat belt retractor 106 according to the seventh embodiment.
In FIG. 2, the lock arm 34 used in the vehicle body acceleration sensor 32 of the first embodiment is omitted, and the sensor arm 31 itself oscillated by the movement of the inertial body 33 on the sensor case 36 is directly connected to the ratchet wheel 24. Tooth 2
4a and the lock operation mechanism 63
The configuration other than the point of changing 8 is completely the same as that of the first embodiment, and the detailed description of the common configuration is omitted.

The lock operating mechanism 6 according to the seventh embodiment.
Reference numeral 38 denotes a retractor base 23 as shown in FIG.
A cylinder member 656 fixed to the side plate 23a, and a pressing piston 6 slidably fitted to the cylinder member 656.
54, and a return spring 655 for urging the pressing piston 654 in the pushing direction. When the seatback 62 is tilted to the rearward tilt limit of the seat belt proper use range S, the lock operation mechanism 638
The contact portion 654a of the pressing piston 654 is brought into contact with the inertial body 33 on the sensor case 36 which is rotated around the rotation axis thereof according to the inclination angle of the seat back 62, thereby preventing the inertial body 33 from moving. I do. Even if the inertia body 33 is prevented from moving, the sensor case 3
Since the rotation of the sensor arm 6 and the sensor arm 31 continues, the inertial body 33 moves relative to the sensor case 36.

That is, when the seat back 62 is tilted beyond the backward tilt limit of the proper use range S of the seat belt, the lock operating mechanism 638 forcibly pushes the inertia body 33 on the sensor case 36 by the pressing piston 654. Relative movement and engaging the sensor arm 31 with the ratchet wheel 24, it is possible to operate the locking means of the emergency locking mechanism 300 independently of the movement of the sensor case 36 and the sensor arm 31 by the transmission means 39. it can. Therefore, also in the seventh embodiment, the same operation and effect as those of the above embodiments can be obtained.

FIG. 16 is a schematic side view of a seatbelt retractor 107 having a vehicle body acceleration sensor 732 according to an eighth embodiment of the present invention. The position of the sensor case 36 when it reaches just before the position and the lock operation mechanism 7
38 shows the state of FIG. The configuration of the seatbelt retractor 107 of the eighth embodiment other than the vehicle body acceleration sensor 732 is the same as that of the retractor 100 of the first embodiment, and a detailed description thereof will be omitted.

The vehicle body acceleration sensor 73 of the eighth embodiment
2. In the vehicle body acceleration sensor 32 of the first embodiment, only the lock operating mechanism for operating the retractor locking means when the seat back 62 is tilted to the rearward tilt limit of the seat belt proper use range S is improved. Things. The rest of the configuration is the same as that of the first embodiment, and the common configuration is denoted by the same reference numeral as in the first embodiment, and description thereof is omitted.

The lock operating mechanism 7 in the eighth embodiment
Reference numeral 38 includes an operating lever 754 whose base end is fixed to a slider 748 coupled to the retractor-side end of the wire 46 and whose distal end engages the swinging end of the lock arm 34. When the seat back 62 is tilted backward to the rearward tilt limit of the proper use range S of the seat belt, the distal end of the operation lever 754 pushes up the lock arm 34 to ratchet the swinging end of the lock arm 34. It is configured to engage with the teeth 24a of the wheel 24. The operation lever 754 is made of synthetic resin. When the tip of the operation lever 754 hits the tooth tip of the ratchet wheel 24 via the lock arm 34, the operation lever 754 side is elastically deformed. This can prevent an excessive load from being applied to other components such as the ratchet wheel 24 and the slider 748.

That is, the lock operation mechanism 738 moves the seat back 6 beyond the proper use range S of the seat belt.
When the operation lever 754 is engaged with the ratchet wheel 24 when the lever 2 is tilted backward, the locking means of the emergency lock mechanism 300 can be operated independently of the movement of the sensor arm 31. Therefore, the vehicle body acceleration sensor 732 according to the eighth embodiment can obtain the same operation and effect as those of the vehicle body acceleration sensor according to each of the above embodiments.

FIG. 17 is a schematic side view of a seat belt retractor 108 having a vehicle body acceleration sensor 832 for a seat belt according to a ninth embodiment of the present invention.
FIG. 8 is a schematic front view of a cam plate 850 fixed to the reclining type seat 61 on the seat seat 63 side. Book 9
The configuration other than the vehicle body acceleration sensor 832 in the seat belt retractor 108 of the embodiment is substantially the same as the retractor 102 of the third embodiment shown in FIG.
Detailed description is omitted.

The vehicle body acceleration sensor 83 of the ninth embodiment
2 is an operation lever 25 that constitutes a lock operation mechanism 238 in the vehicle body acceleration sensor 232 of the third embodiment.
4 and a cam plate 8 instead of the cam plate 50
The lock operation mechanism 838 is constituted by using the reference numeral 50. That is, the cam plate 850 used in the ninth embodiment includes the follower 4
7, a displacement corresponding to the inclination of the seat back 62 is given. However, as shown in FIG. 18, when the seat back 62 is in the inclined state C which is the end position of the proper use range S of the seat belt. from the contact position P ₁ of the follower 47, in the interval until the abutment position P ₂ of the follower 47 when exceeding the傾限field after proper use range S of the seat belt, providing a rapid displacement to the wire 46 A shift cam surface 50c is provided.

According to the shift cam surface 50c, the sensor case 36 is required due to the slight tilting of the seat back 62 from the rearward tilt limit of the proper use range S of the seat belt to immediately after the rearward tilt limit is exceeded. In response to the large rotation described above, the sensor arm 3 is tilted until the inertia body 33 moves, and swings due to the movement of the inertia body 33.
By engaging 1 with the ratchet wheel 24, the locking means of the retractor is activated.

That is, the lock operation mechanism 838 moves the seat back 6 beyond the proper use range S of the seat belt.
2 is tilted backward, the cam surface 5 for dislocation of the cam plate 850 is moved.
0c inclines the sensor case 36 via the wire 46 at a stroke larger than at least the inclination angle α of the inertial body support surface 36a, thereby minimizing the influence of the leaning state of the vehicle body and the like, thereby reducing the locking means of the emergency lock mechanism 300. Can be activated. Therefore, the vehicle body acceleration sensor 832 according to the ninth embodiment can also obtain the same operation and effect as the vehicle body acceleration sensor according to each of the above embodiments. Further, since the function as the lock operation mechanism can be obtained only by the shift cam surface 50c formed on the cam plate 850, the number of parts can be reduced and the assemblability can be improved.

FIG. 19 is a schematic side view of a seat belt retractor 109 provided with a vehicle body acceleration sensor 932 according to a tenth embodiment of the present invention. FIG. It is a schematic front view of the fixed cam plate 950. The vehicle body acceleration sensor 932 according to the tenth embodiment differs from the vehicle body acceleration sensor 232 according to the third embodiment in that the locking means of the retractor is used when the seat back 62 is tilted to the rearward tilt limit of the proper use range S of the seat belt. Only the lock operation mechanism to be operated is improved. The rest of the configuration is the same as that of the third embodiment, and the description of the common configuration will be omitted by retaining the same reference numerals as those of the third embodiment.

The lock operating mechanism 938 in the tenth embodiment is similar to the transmitting means 39 for adjusting the angle of the sensor case 36 in accordance with the tilt of the seat back 62,
A flexible shaft 146 displaced in the longitudinal direction following the cam surface of the cam plate 950 when the seat back 62 is tilted;
6 is provided at the retractor side end of the seat back 62.
Is engaged with the ratchet wheel 24 when the seat belt is tilted rearward to the rearward tilt limit of the proper use range S of the seat belt.
54. An engagement claw 95 engageable with the teeth 24 a of the ratchet wheel 24 is provided at a tip end of the operation member 954.
4a is elastically supported.

The flexible shaft 146 is slidably supported in the guide tube 145. Further, as shown in FIG. 20, the cam plate 950 of the transmission means 39 for displacing the wire 46 in accordance with the tilt of the seat back 62 includes a follower 147.
And also functions as a cam plate for applying a displacement to the flexible shaft 146 via the. The cam surface of the cam plate 510 that applies a longitudinal displacement to the wire 46 and the flexible shaft 146 is wider than the cam surface of the cam plate 50 used in the first embodiment so that two followers can abut. It is formed in.

That is, the lock operation mechanism 938 moves the seat back 6 beyond the proper use range S of the seat belt.
2 is tilted backward, the engagement claw 954 of the operation member 954
By engaging a with the ratchet wheel 24, the locking means of the emergency lock mechanism 300 can be operated independently of the movement of the sensor arm 31. Therefore, the vehicle body acceleration sensor 932 according to the tenth embodiment is described.
However, the same operation and effect as those of the vehicle body acceleration sensor of each of the above embodiments can be obtained.

The operating member 954 is engaged with the engaging claw 954a.
By elastically supporting the ratchet wheel 954a, even if the engaging claw 954a hits the tooth tip of the ratchet wheel 24, it is possible to prevent an excessive load from acting on other components such as the ratchet wheel 24 and the flexible shaft 146. it can. Also, as shown in FIG. 21, a cam plate 95 for displacing the flexible shaft 146 of the lock operating mechanism 938 in the longitudinal direction separately from the cam plate 50 for displacing the wire 46 of the transmission means 39 in the longitudinal direction.
1 may be provided. In this case, the cam plate 951 only needs to be capable of imparting a displacement sufficient to engage the operation member 954 with the ratchet wheel 24 when the seat back 62 tilts beyond the rearward tilt limit. When the seat back 62 is tilted, it is not necessary to displace the wire 46 in the longitudinal direction, so that the cam 46 can be formed in a simple cam shape as compared with the cam plate 50.

FIG. 22 is a schematic side view of a seat belt retractor 110 provided with a vehicle body acceleration sensor 1032 according to an eleventh embodiment of the present invention.
7 shows the position of the sensor case 36 and the state of the lock operating mechanism 1038 when the position reaches just before the rearward limit position of the seat belt proper use range S. Although not shown in detail, the seatbelt retractor 110 of the eleventh embodiment is rotatably supported by the retractor base 23 by being inserted into a substantially cylindrical bobbin around which the webbing 70 is wound. And an emergency lock mechanism 400 for restraining rotation of the winding shaft in the webbing withdrawal direction in the event of a vehicle emergency. The specific configuration of the emergency lock mechanism 400 is slightly different from that of the emergency lock mechanism 300, and the ratchet wheel 1024, which is a lock operating means, has a rotation delay with respect to the winding shaft, so that the latch cup 1
Numeral 025 is to engage the pawl 1030, which is a locking means, with the latch plate 1040 provided at one end of the winding shaft to prevent the winding shaft from rotating in the webbing pull-out direction.

Below the ratchet wheel 1024, a vehicle acceleration sensor 103 according to the eleventh embodiment is provided.
Two are equipped. In the vehicle body acceleration sensor 1032 according to the eleventh embodiment, the operating unit 10 is attached to the tip of the slider 1048 connected to the retractor side end of the wire 46 that is displaced in the longitudinal direction in accordance with the tilt of the seat back 62.
When the seat back 62 is tilted beyond the proper use range S of the seat belt, the lock operating mechanism 1038 for operating the retractor locking means is driven by the operating portion 1049. The other configuration is substantially the same as the vehicle body acceleration sensor 232 of the third embodiment.

The lock operating mechanism 103 of the eleventh embodiment
8 is an engaging arm 10 protruding from the pole 1030.
31 and a pole 103 engaged with the engagement arm 1031.
And the operation unit 1049 capable of swinging zero. Then, the seat back 62 is in the proper use range S
When the slider 1048 is tilted backward to the rearward tilt limit position, the operation unit 1049 of the slider 1048 presses the engagement arm 1031 of the pawl 1030 to engage the pawl 1030 with the latch plate 1040.

At the tip of the operating portion 1049, a cylindrical portion 1 supporting a contact member 1050 via a spring member 1055 is provided.
051 and the corresponding contact member 1050 is the wire 4
The configuration is such that the pole 1030 is rotated by the displacement in the longitudinal direction of the pole 6. Therefore, when the locking portion 1030a of the pawl 1030 hits the tooth tip of the latch plate 1040, the spring member 1055 causes the engagement arm 1
It is possible to prevent an unreasonable load from being applied to other components such as 031 and the slider 1048.

That is, the lock operation mechanism 1038 engages the pawl 1030 with the latch plate 1040 when the seat back 62 is tilted rearward beyond the proper use range S of the seat belt, whereby the sensor arm The locking means of the emergency lock mechanism 400 can be operated independently of the movement of the lock 31. Therefore, also in the vehicle body acceleration sensor 1032 according to the eleventh embodiment, the same operation and effect as those of the above embodiments can be obtained. It should be noted that the configurations of the lock unit, the sensor arm, the sensor case, the inertial body, and the like in the present invention are not limited to the configurations of the above-described embodiments, and it is needless to say that the configurations can be appropriately changed based on the gist of the present invention. No.

[0087]

According to the vehicle body acceleration sensor for a seat belt of the present invention, when the rearward tilt angle of the seat back of the reclining type seat reaches the rearward tilt limit of the proper use range of the seat belt, the webbing withdrawal direction of the winding shaft is obtained. The lock means for locking the rotation of the webbing is operated by the lock operation mechanism, so that the pulling out of the webbing can be locked quickly and reliably regardless of the inclination state of the sensor case. Therefore, when the seat back is tilted backward beyond the proper use range of the seat belt, the locking means of the retractor is reliably operated to prevent the webbing from being pulled out, thereby reliably preventing the seat belt from being worn. Thus, accidents due to incorrect use of the seat belt can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a reclining type seat in which a seat belt retractor including a vehicle body acceleration sensor for a seat belt according to a first embodiment of the present invention is incorporated in a seat back.

FIG. 2 is a seat side view schematically showing a transmission unit in the vehicle body acceleration sensor for a seat belt according to the first embodiment of the present invention shown in FIG.

FIG. 3 is an enlarged view of a main part of the transmission means shown in FIG. 2;

FIG. 4 is a schematic side view of the seatbelt retractor including the seatbelt vehicle acceleration sensor according to the first embodiment of the present invention, in which the seatback is positioned immediately before the rearward tilt limit position of the proper use range of the seatbelt. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 5 is a schematic side view of a seat belt retractor provided with the vehicle body acceleration sensor for a seat belt according to the first embodiment of the present invention, in which a seat back exceeds a backward tilt limit position of a proper use range of the seat belt. 4 shows the position of the sensor case and the state of the lock operation mechanism when the sensor case is tilted backward.

FIG. 6 is a schematic side view of a seat belt retractor provided with a vehicle body acceleration sensor for a seat belt according to a second embodiment of the present invention. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 7 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a second embodiment of the present invention, in which a seatback exceeds a rearward tilt limit position of a proper use range of the seatbelt. 4 shows the position of the sensor case and the state of the lock operation mechanism when the sensor case is tilted backward.

FIG. 8 is a schematic side view of a seat belt retractor provided with a vehicle body acceleration sensor for a seat belt according to a third embodiment of the present invention. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 9 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a third embodiment of the present invention, in which a seatback exceeds a rearward tilt limit position of a proper use range of the seatbelt. 4 shows the position of the sensor case and the state of the lock operation mechanism when the sensor case is tilted backward.

FIG. 10 is a schematic side view of a seatbelt retractor including a vehicle body acceleration sensor for a seatbelt according to a fourth embodiment of the present invention, in which a seatback is positioned immediately before a rearward tilt limit position of a proper use range of the seatbelt. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 11 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a fifth embodiment of the present invention. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

12 is an enlarged view of a main part showing a configuration of a transmission unit of the vehicle body acceleration sensor for the seat belt shown in FIG.

FIG. 13 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a sixth embodiment of the present invention, in which a seatback is positioned immediately before a rearward tilt limit position of a proper use range of the seatbelt. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 14 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a seventh embodiment of the present invention, in which a seatback is positioned immediately before a rearward tilt limit position of a proper use range of the seatbelt. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 15 is an enlarged sectional view of a lock operating mechanism used in the vehicle body acceleration sensor for the seat belt shown in FIG.

FIG. 16 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to an eighth embodiment of the present invention, in which a seatback is positioned immediately before a rearward tilt limit position of a proper use range of the seatbelt. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 17 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a ninth embodiment of the present invention. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

18 is an enlarged view of a main part of a transmission unit of the vehicle body acceleration sensor for the seat belt shown in FIG.

FIG. 19 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to a tenth embodiment of the present invention. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

20 is an enlarged perspective view of a main part of a transmission unit and a lock operation mechanism of the vehicle body acceleration sensor for the seat belt shown in FIG. 19;

FIG. 21 is an enlarged perspective view of a main part showing a modification of the transmission means and the lock operation mechanism shown in FIG. 20;

FIG. 22 is a schematic side view of a seatbelt retractor provided with a vehicle body acceleration sensor for a seatbelt according to an eleventh embodiment of the present invention, in which a seatback is positioned immediately before a rearward tilt limit position of a proper use range of the seatbelt. Fig. 7 shows the position of the sensor case and the state of the lock operation mechanism when the temperature reaches the threshold.

FIG. 23 is a longitudinal sectional view of a conventional vehicle body acceleration sensor.

FIG. 24 is a seat perspective view showing a schematic configuration of a conventional seatbelt device provided with a retractor on a seatback of a reclining type seat.

25 is a seat side view showing a reclining range of a seat back in the reclining type seat shown in FIG. 24.

[Explanation of symbols]

 23 retractor base 24 ratchet wheel 24a teeth 31 sensor arm 32 vehicle body acceleration sensor 33 inertia body 34 lock arm 36 sensor case 37 case support member 38 lock operation mechanism 39 transmission means 45 guide cylinder 46 wire 54 engagement lever 54a engagement claw 55 Return spring 56 Operation part 56 61 Reclining type seat 62 Seat back 63 Seat seat part 70 Webbing 100 Retractor

Claims (1)

[Claims] 1. A retractor base mounted on a seat back of a reclining type seat of a vehicle, a winding shaft rotatably supported by the base, and a sensor rotatably supported by the retractor base. A case and a first position for actuating a lock means for locking the rotation of the winding shaft of the retractor for the seat belt in the webbing withdrawal direction, and a second position for disabling the lock means. A sensor arm rotatably mounted on the sensor case or retractor base,
An inertial body that moves relative to the inertial body support surface of the sensor case when receiving a speed change of a predetermined value or more and moves the sensor arm to the first position, and the orientation of the inertial body support surface is the position of the seat back. Transmission means for interlocking the sensor case in accordance with the inclination angle of the seat back so as to be properly maintained regardless of the inclination state, and the inertial body moves when a predetermined vehicle acceleration is applied. A vehicle acceleration sensor for a seat belt for operating a locking means, comprising a lock operating mechanism for operating the locking means when the seat back is tilted beyond a proper use range of the seat belt. A vehicle acceleration sensor for seat belts.