JPH11326362A - Body acceleration sensor for seat belt - Google Patents

Abstract

(57) [Problem] To provide a vehicle body acceleration sensor for a seatbelt that can reduce the manufacturing cost with a simple mechanism while accurately adjusting the direction of a sensor case. SOLUTION: The sensor is rotatably mounted on a sensor case so as to be located at a first position for operating a lock means for locking rotation of a take-up shaft in a webbing pull-out direction and a second position for not operating the lock means. The sensor arm, the inertial body that relatively moves on the sensor case and moves the sensor arm to the first position, and the orientation of the sensor case is properly maintained regardless of the tilt state of the seat back 62. Transmission means 9 for interlocking the sensor case according to the inclination angle of the seat back 62
0. The locking means is operated by a movement operation of the inertial body when a predetermined vehicle acceleration is applied.

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 in a vehicle acceleration sensor for a seat belt that operates a locking means.

[0002]

2. Description of the Related Art Conventionally, a retractor for a seat belt device for holding a vehicle occupant or the like safely in a seat includes an automatic lock retractor and an emergency lock retractor. And generally, an emergency lock retractor is used which has an emergency lock mechanism for physically locking the retractor by inertial sensing means responding to sudden acceleration, collision or deceleration and effectively and safely restrains the occupant. I have.

Further, as an inertial sensing means used in such an emergency lock type retractor, there is a vehicle body acceleration sensor for detecting the acceleration and inclination of the vehicle body. This vehicle body acceleration sensor, for example, when the inertial body moves due to collision or inclination of the vehicle body, swings the sensor arm provided on the upper part of the inertial body, and rotates the take-up shaft on which the webbing is wound in the webbing pull-out direction. This is a configuration for operating locking means for locking.

Incidentally, it has been proposed that the retractor as described above is used by being attached to a seat back (seat back) of a reclining type seat of a vehicle or the like. However, when the retractor is attached to the seat back, if the occupant changes the seat back to a different tilt position according to his or her physique, the inertia of the vehicle body acceleration sensor moves due to this tilt and the sensor arm operates. I will. Then, a situation arises in which the rotation of the winding shaft in the webbing withdrawing direction is locked and the webbing cannot be withdrawn.

Accordingly, for example, US Pat. No. 4,978,087
In the specification, there is disclosed a seat belt device that appropriately adjusts the direction of a sensor case by a flexible shaft that is a transmission unit according to a reclining angle of a seat back. However, in this seat belt device, the angle detecting means for detecting the angle of the seat back is not described in detail.

[0006]

By the way, the angle detecting means is provided on a seat back side of a recliner (seat hinge mechanism) and is provided on a seat seat side with a member which rotates together with the seat back. Angle detecting means for detecting a relative turning movement with respect to the member to be performed is conceivable. Then, the relative movement of the two members is detected by the angle detecting means, and the detection result is transmitted to the retractor side by the transmitting means to adjust the sensor case to an appropriate direction.

Since the angle detecting means moves in accordance with the rotation of the seat back, it is preferable that the rotation axis is on the same axis as the adjustment axis of the seat back. As shown in FIG. 11, if the adjustment axis O of the seat back does not coincide with the rotation axis C of the angle detecting means, for example, the position of the seat back at point A (the position at which the angle detecting means is attached to the seat back). The rotation angle θ does not match the rotation angle α of the angle detecting means, and the direction of the sensor case cannot be adjusted accurately.

In order to make the adjustment axis of the seat back coincide with the rotation axis of the angle detecting means, it is necessary to make each of the recliner mechanism to which the angle detecting means is attached and the angle detecting means with high dimensional accuracy. Each has a large number of parts, and as a result, the product becomes expensive.

The present invention has been made based on the above background, and an object of the present invention is to provide a seat belt capable of reducing the manufacturing cost with a simple mechanism while accurately adjusting the direction of a sensor case. Vehicle body acceleration sensor.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sensor case movably supported by a retractor base mounted on a seat back of a reclining type seat of a vehicle or the like, and a winding case on which a webbing is wound. A first position for actuating a locking means for locking the rotation of the take-up shaft in the webbing withdrawal direction, and a second position for disabling the locking means.
And a sensor arm that is rotatably attached to the sensor case or the retractor base to be located at each of the positions, and relatively moves on an inertial body supporting surface of the sensor case when a speed change of not less than a predetermined value is received, An inertia body that moves the sensor arm to the first position, and an inertia body that moves in accordance with the inclination angle of the seatback such that the orientation of the inertia body support surface is appropriately maintained regardless of the inclination state of the seatback. This is achieved by providing a vehicle body acceleration sensor for a seatbelt, comprising: a transmission unit for interlocking a sensor case; and operating the locking unit by a movement operation of the inertial body when a predetermined vehicle body acceleration is applied.

Here, the transmission means detects a relative turning motion between a member disposed on the seat back side and rotating together with the seat back and a member disposed on the seat seat side, so that the seat back is detected. And a seat rotation axis provided on the adjustment axis of the seat back, and a rotation axis of the angle detection means provided concentrically with the adjustment axis of the seat back. It is preferable that uneven portions to be fitted to each other are provided.

According to the above construction of the present invention, the rotation axis of the seat back and the angle detecting means is adjusted by the concave and convex portions provided on the rotating axis of the seat back and the rotating axis of the angle detecting means. Matches. Therefore, the rotation angle of the seat back matches the rotation angle of the angle detection means, so that the direction of the sensor case can be accurately adjusted by the transmission means. Further, since the concave and convex portions to be fitted with each other are merely provided on the seat rotation axis of the seat back and the rotation axis of the angle detecting means, the manufacturing cost does not increase.

In order to perform accurate adjustment, preferably, the angle detecting means has a mounting hole through which a bolt for mounting the angle detecting means to the portion to be mounted penetrates. Since the holes are loosely fitted, deviation of the mounting pitch of the sheet with respect to the mounting portion can be tolerated, and high dimensional accuracy is not required, so that manufacturing costs can be reduced.

Further, as a structure for assembling the seat belt device of the present invention to a seat, a temporary fixing means is used to temporarily fix the angle detecting means to keep the relative positions of the components of the angle detecting means constant. In this state, the seat belt device is attached to a jig corresponding to the seat, the orientation of the sensor case is appropriately set, the seat belt device is removed from the jig, and the seat belt device is mounted on a seat mounted on a vehicle body. Is mentioned.

The temporary fixing means is a component of the angle detecting means, for example, a slider which is provided on the seat seat side, and a case which is provided on the seat back side and rotates together with the seat back. In addition, there is a configuration in which a hole is formed in the seat side plate and a removable pin is inserted into the hole to make the relative position constant, thereby performing temporary fixing. In addition, the temporary fixing may be performed by using a removable block member which is fitted by being brought into contact with the projection of the case and being brought into contact with the side surface of the lever connected to the seat-side plate. . Further, a temporary fixing may be performed by using a cut-and-raised portion provided on the seat-side plate and a pair of protrusions provided on the case with the cut-and-raised portion interposed therebetween.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the first embodiment of the present invention.
1 shows a schematic side view of a reclining type seat to which a seat belt device according to an embodiment is attached.

As shown in FIG. 1, the vehicle acceleration sensor 3
The seatbelt retractor 100 constituting the seatbelt device provided with the seat 2 is mounted on a seatback 62 of a reclining type seat 61 mounted on a vehicle or the like. The seat back 62 is connected to the seat 63 so as to be rotatable around a rotation axis (adjustment axis of the seat back) extending in the width direction of the vehicle body. The tilt angle is adjusted.

FIG. 2 shows a seat belt retractor 100.
FIG. 3 shows a side view of the seat belt retractor 10.
0 shows a partial cross-sectional view. As shown in FIGS. 2 and 3, the seat belt retractor 100 has a substantially cylindrical bobbin 2 around which webbing is wound, and a retractor base 1 is rotatably supported through the bobbin 2. And the latch plate 4a, which is a ratchet wheel, is connected to one end side (in FIG. 3,
(Right side) and an emergency lock mechanism 300 for preventing the latch plate 4a from rotating in the webbing withdrawing direction in a vehicle emergency.

The retractor base 1 fixed to a frame member (not shown) of the seat back 62 is formed by press-molding a metal plate so that most of the retractor base 1 has a U-shaped cross section. At a position facing the side plates 1a and 1b, a winding shaft 4 combined with the bobbin 2 is rotatably bridged. The other end of the winding shaft 4 through which the side plate 1b of the retractor base 1 is inserted is provided with the winding shaft 4
A known take-up spring device (not shown) which constantly urges the bobbin 2 in the webbing take-up direction via the webbing is provided.

In the present invention, various known structures can be adopted as a specific configuration of the emergency lock mechanism 300 for locking the rotation of the winding shaft 4 in the webbing withdrawing direction in the event of a vehicle emergency. For example, in the case of the present embodiment, the ratchet wheel 19 as the locking means causes a rotation delay with respect to the winding shaft 4, so that the latch cup 13 engages the pawl 11 as the locking means with the latch plate 4a, The rotation of the take-up shaft 4 in the webbing pull-out direction is prevented.

A vehicle acceleration sensor 32 is provided below the ratchet wheel. The vehicle body acceleration sensor 32 includes a sensor arm 31, a sensor case 36, and an inertial body 33, as shown in FIGS.

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. In addition, the inertial body support surface 36a of the sensor case 36 has a bowl shape that is concave toward the center. The case support member 37 includes a case support portion 40 to which the sensor case 36 is detachably attached by fitting, and extends upward from one side surface of the case support portion 40 to rotatably support the retractor base 1. Shaft support 41 and a terminal member 92b of the inner cable 92
And a connecting portion 42 connected to the connecting portion 42.

The shaft support 41 of the case support member 37 is
The take-up shaft 4 is supported so as to be rotatable about a rotation axis S. When the seat back 62 is reclined by the transmission member 90 constituting the vehicle body acceleration sensor 32 connected to the connection portion 42, the case support member 37 is used.
Is rotated in conjunction with the reclining of the seat back 62, and the sensor case 36 is adjusted to an appropriate direction.

As shown in FIG. 2, the sensor arm 31 has a base end 31a rotatably supported by the sensor case 36. When the sensor case 36 is attached to the retractor 100, From the first position, in which the tip 31b engages with the teeth 19a of the ratchet wheel 19 to activate the locking means for locking the winding shaft 4 from rotating in the webbing withdrawing direction,
The shaft 31a can be pivotally displaced about the shaft 31a as a rotation axis to a second position where the distal end 31b is separated from the teeth 19a and does not operate the locking means. The “lock means” in the present invention means the emergency lock mechanism 300 except for the vehicle body acceleration sensor 32.

When the tip 31b of the sensor arm 31 engages with the teeth 19a of the ratchet wheel 19, the ratchet wheel 19 is delayed in rotation with respect to the winding shaft 4, and the pole 11 Are engaged with the latch plate 4a, and the rotation of the winding shaft 4 in the webbing withdrawing direction is prevented. Further, the inertia body 33
Has a spherical shape, and when it is placed on the inertial body support surface 36a and receives a speed change of not less than a predetermined value, it relatively moves on the inertial body support surface 36a and circumscribes the inertial body 33. The sensor arm 31 is moved to the first position.

FIG. 4 is a partially enlarged view of the reclining type seat 61 according to the first embodiment of the present invention. As shown in FIG. 4, the seat back 62 is connected to the seat portion 63 so as to be rotatable around a rotary shaft 77 extending in the vehicle body width direction. The tilt angle is adjusted. A first plate 71 is attached to the seat back 62, and a seat seat 63 is provided.
, A second plate 72 is attached.

The first plate 71 has a first mounting hole 7
The second plate 72 is provided with a second mounting hole 72a and a third mounting hole 72b. In addition, a circular concave portion 75 is provided on an end surface of the rotation shaft 77 that penetrates the first plate 71 and the second plate 72.

FIG. 5 is a schematic view of the angle detecting means 70 according to the first embodiment of the present invention. As shown in FIG. 5, the angle detecting means 70 provided in the transmitting means 90 includes a case 81 which is a member which rotates together with the seat back 62, a seat seat side plate 98 attached to the second plate 72, and a seat. Winding for detecting the inclination angle of the seat back 62 by detecting a relative turning motion with a slider 82 which is a member disposed on the seat seat side via a lever 83 fixed to the seat side plate 98. Means 80.

Therefore, the inclination angle of the seat back 62 is detected by detecting the relative turning motion between the case 81 and the seat-side plate 98, and the case supporting member 37 is transmitted through the transmission means 90. It is linked to the reclining angle of 62. The case 81
A first mounting hole 97a is provided in the seat back-side plate 97 integrally formed with the seat, and a second mounting hole 98a and a third mounting hole 98 are formed in the seat-seat-side plate 98.
b is provided. The first mounting hole 97a, the second mounting hole 98a, and the third mounting hole 98b are fool holes into which mounting bolts are loosely fitted. In the first embodiment, the seat back side plate 97 and the case 81
Is integrally formed, but may be formed as a separate member.

The seat seat side plate 98 is provided with a shaft member 99 serving as a rotation axis of the angle detecting means 70 provided concentrically with the adjustment axis of the seat back 62, and is a cylindrical projection. The shaft member 99 is connected to the seat rotation shaft 7.
7 with the concave portion 75. Here, the convex member 99 may be formed integrally with the seat-side plate 98. The shaft member 99 has a chamfered tip, so that it can be easily inserted into the recess 75.

FIG. 6 is an exploded perspective view of the angle detecting means 70. As shown in FIG.
The case 81 accommodates an inner cable 92 constituting the transmission means 90 and is integrally formed with the seat back side plate 97, a slider 82 having a substantially fan shape around which the inner cable 92 is wound, and a projection 83b. A lever 83 having a cylindrical portion 83a serving as a rotation axis of the slider 82 for preventing rotation of the slider 82, a washer 84 having a long hole, and connecting the lever 83 via the washer 84 to the seat seat portion. And a nut 85 that can be fixed to the side plate 98. Here, the washer 8
The lever 83 may be fixed by caulking the front end 98t of the seat seat fixing member 98 without providing the nut 4 and the nut 85.

The case 81 has a groove 81b for accommodating a screw portion 95a of a joint 95 connected to an end of the outer tube 94 constituting the transmission means 90 on the seat rotation axis side. Adjusting screw 91 to be screwed
A hole 81c through which the cylindrical portion 83a of the lever 83 is inserted;
2, and a projection 81e for preventing the rotation of the second member 2 are provided.

The slider 82 includes a hollow cylindrical portion 82a rotatably supported by the cylindrical portion 83a of the lever 83, an arc-shaped guide groove 82b around which the inner cable 92 is wound, and A hole 82c to which the terminal member 92a of the cable 92 is fixed is provided.

Further, an adjusting screw 91 and a nut 93 are attached to the screw portion 95a of the joint 95 of the transmission means 90. Therefore, by appropriately adjusting the adjusting screw 91 housed in the screw housing hole 81a of the case 81 and the adjusting screw 93 abutting on the end 81f of the case 81, the screw is formed in the groove 81b of the case 81. The joint 95 in which the portion 95 a is stored moves in the Z direction, and the outer tube 9 connected to the joint 95 is moved.
By moving 4, the protrusion of the inner cable 92 housed in the outer tube 94 can be adjusted.

The slider 82 and the case 8
1 and the seat-seat-side plate 98 are provided with holes 82k, 81k, and 98k, respectively, which function as temporary fixing means described later. These holes 82k, 81k,
98k are provided so as to be located on the same line at the initial position of the seat back shown in FIG. 1 (a position having an inclination angle set for assembly).

Here, when the seat back 62 shown in FIG.
Is pulled by the inner cable 92 and tries to rotate in the counterclockwise direction.
It does not rotate when pressed by b. On the other hand, the case 81
As the seat back 62 falls, the seat back 6
2 and counterclockwise. Then, the end of the slider 82 and the end of the inner cable 92 do not move, and the case 81 rotates counterclockwise, so that the inner cable 92 extends and is wound around the guide groove 82b of the slider 82. .

Then, as shown in FIG. 2, the inner cable 92 is pulled in the Y direction. One end 92b of the inner cable 92 is connected to the case supporting member 37, and the inner cable 92 is also moved along the winding surface 44 concentric with the winding shaft 4, so that the case supporting member 37 is It rotates clockwise about the take-up shaft 4. Therefore, the winding radius of the inner cable 92 wound around the guide groove 82b of the slider 82 and the winding radius of the inner cable 92 wound around the winding surface 44 via the spring 89 are set to be equal. Since the seat back 62 is tilted and the other end of the inner cable 92 moves by the length of the inner cable 92 wound around the slider 82, the sensor case 36 rotates by the angle at which the seat back 62 tilts. Therefore, the seat back 6
Regardless of the tilt state of 2, the direction of the sensor case 36 is kept appropriate (vertically upward), so that the acceleration of the vehicle body can be reliably detected.

Next, a process of assembling the seat belt device of the present invention to a seat will be described. Before assembling the seat belt device to the seat, the sensor case 36 of the vehicle body acceleration sensor 32 needs to be oriented properly when assembled. Here, since the orientation of the sensor case 36 is adjusted by the angle detecting means 70 and the transmitting means 90, the angle detecting means 70 and the transmitting means 90 are moved to the initial position of the seat back before the seat belt device is assembled. It is necessary to adjust to the corresponding state. That is, it is necessary to temporarily fix the angle detecting means 70 in a predetermined state and adjust the transmitting means.
In order to perform the temporary fixing, the temporary fixing pins 88 shown in FIG. 6 are inserted so as to penetrate the holes 82k, 81k, and 98k provided in the slider 82, the case 81, and the seat-side plate 98, respectively. Thus, the angle detecting means 70 is temporarily stopped.

Thereafter, while maintaining the temporarily fixed state, the angle detecting means 70 is attached to the jig corresponding to the sheet, the adjusting screw 91 is adjusted, and the position of the joint 95 is adjusted. The joint 95 is connected to the outer tube 94. By moving the inner cable 92 in the outer tube 94, the protrusion of the inner cable 92 is adjusted, and the sensor case 36 is adjusted in an appropriate direction. The seat belt device in this state is removed from the jig.

Thereafter, the seat belt device is mounted on the seat actually mounted on the vehicle body. This final assembly step will be described below. Centering is first performed by the shaft member 99 shown in FIG. 5 and the concave portion 75 of the seat back 62, and thereafter, a first mounting hole 97 a of the seat back side plate 97 and a second mounting hole 98 of the seat side plate 98.
a, the third mounting holes 98b are respectively connected to the first plate 7
The angle detecting means 70 is bolted to the seat back 62 or the seat seat 6 in accordance with the first mounting hole 71a, the second mounting hole 72a and the third mounting hole 72b of the second plate 72.
Attach to 3.

Here, since the shaft member 99 of the angle detecting means 70 fits into the concave portion 75 of the rotating shaft 77 of the seat back 62, the adjusting axis of the seat back 62 and the angle detecting means 70 Can be made to coincide with each other. Therefore, since the rotation angle of the seat back 62 and the rotation angle of the angle detection unit 70 match, the direction of the sensor case 36 can be accurately adjusted by the transmission unit 90. Further, the shaft member 99 and the concave portion 75 which fit each other are connected to the seat side plate 98 and the seat rotating shaft 7.
7, the manufacturing cost does not increase.

Further, both the angle detecting means 70 and the reclining type seat 61 are composed of a plurality of parts, and there is a slight deviation in the mounting pitch due to factors such as dimensional tolerances and clearance of the movable parts. However, the angle detecting means 70
If the mounting position is shifted, it cannot be fixed, and the seat back angle cannot be detected correctly. Therefore, it is necessary to mount the angle detecting means 70 accurately. In the present embodiment, the first mounting holes 9 of the seat back side plate 97 are provided.
7a, a second mounting hole 98a of the seat fixing member 98
The third mounting hole 98b is formed as a stupid hole into which a bolt is loosely fitted, so that the first plate 71 serving as a portion to be mounted is provided.
The first mounting hole 71a and the second mounting hole 72a and the third mounting hole 72b of the second plate 72 can be fixed even if they are misaligned. Note that the first mounting hole 97a and the second
The mounting hole 98a and the third mounting hole 98b may be formed as long holes. Accordingly, the angle detecting means 70 can tolerate a shift in the mounting pitch with respect to the seat back 62, and high dimensional accuracy is not required, so that manufacturing costs can be reduced.

By obtaining the above steps, the seat belt device is assembled on the seat. Then, finally, the temporary fixing pin 88 is pulled out and the temporary fixing is released, whereby the assembly of the seat belt device is completed.

Next, a modification of the temporary fixing means in the first embodiment will be described. First, a first modification will be described with reference to FIG. The angle detecting means 70 shown in FIG. 7 has substantially the same configuration as the angle detecting means 70 shown in FIG. 6, except that the slider 82, the case 81, and the seat seat side plate 98 shown in FIG. The holes 82k, 81k and 98k are not provided in the slider 82, the case 81 and the seat-side plate 98 of the first modification shown in FIG. And
A block member 87 (shown by hatching for convenience) is used as a temporary fixing means instead.

As shown in FIG. 2, the inner cable 92 is connected to the inner cable 92 by a spring 89 for urging the case support member 37 in the counterclockwise direction on the retractor 100 side.
As shown in the figure, the urging force in the X direction normally works. This X
The slider 82 receives a force in the counterclockwise direction by the biasing force in the direction, contacts the protrusion 83b of the lever 83 connected to the seat side plate 98, and cannot further rotate in the counterclockwise direction. ing. Therefore, Case 8
If the relative position between the first and seat seat side plates 98 is not changed, as a result, the slider 82 can also be maintained at a fixed position, and can be temporarily fixed. As a means for performing such a temporary fixing, a block member 87 that fits by contacting the protrusions 81e and 81f of the case 81 and contacting the side surface of the lever 83 connected to the seat-side plate 98 is provided. By using this, the relative position between the case 81 and the seat-seat-side plate 98 becomes constant, and temporary fixing becomes possible.

By performing the temporary fixing using the block member 87 as described above, the angle detecting means can be temporarily fixed in the same manner as when a pin is used as the temporary fixing means.

Next, with reference to FIG.
A modified example will be described. First, the angle detecting means 70 shown in FIG. 8 is the same as the angle detecting means 7 shown in FIGS. 5, 6, and 7.
7, except that holes 82k, 81k, and 98k provided in the slider 82, the case 81, and the seat side plate 98 of FIG. 6 are not provided, and the block shown in FIG. That is, the member 87 is not used. And as an alternative temporary fixing means,
As shown in FIG. 8A, a cut-and-raised portion 98t provided on the seat side plate 98 and the cut-and-raised portion 98t are provided.
And a pair of protrusions 81t provided on the case 81 with the.

As in the first modification, the case support member 37
The slider 82 receives a force in the counterclockwise direction by the spring 89 for urging the slider 82 in the counterclockwise direction, abuts the projection 81b of the lever 83, and can no longer rotate counterclockwise. I have. Therefore, also in the second modification, if the relative position between the case 81 and the seat side plate 98 is not changed, as a result, the slider 82 can be maintained at a fixed position. Is possible. As means for performing such temporary fixing, a cut-and-raised portion 98 cut and raised by a hole 98t perpendicular to the plane of the seat seat side plate 98 is used.
t is a pair of protrusions 81t provided on the outer periphery of the case 81.
By being sandwiched between the case 81 and the case 81, the relative position between the case 81 and the seat side plate 98 becomes constant, and temporary fixing becomes possible.

As described above, by performing the temporary fixing using the cut-and-raised portion 98t and the projection 81t, the same effect as when the pin and the block member are used as the temporary fixing means can be obtained. As a method of releasing the temporarily fixed state, as shown in FIG. 8B, the cut-and-raised portion 98t is bent downward in the figure to remove the temporarily raised portion from the groove formed between the projecting portions 81t, and the temporary fixing is performed. There is a way to cancel it.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 9 shows a partially enlarged view of the reclining type seat 161 according to the second embodiment of the present invention. As shown in FIG. 9, the seat back 162 is connected to the seat seat 163 so as to be rotatable about a rotation shaft 177 extending in the vehicle width direction. First plate 171 as in the embodiment
The second plate 172 is attached to the seat portion 163.

The first plate 171 is provided with a first mounting hole 171a, and the second plate 172 is provided with a second mounting hole 172a and a third mounting hole 172b. In addition, a convex portion 175 having a cylindrical shape is provided on an end surface of the rotation shaft 177 penetrating the first plate 171 and the second plate 172. The tip of the projection 175 is chamfered.

FIG. 10 is a schematic view of an angle detecting means 170 according to the second embodiment of the present invention. As shown in FIG. 10, the angle detecting means 170 includes a case 81 which is a member that rotates together with the seat back, a seat seat side plate 198 fixed to the second plate 172, and a seat seat side plate 198. And a winding means 80 for detecting the inclination angle of the seat back 62 by detecting a relative turning movement with respect to a slider 82 which is a member arranged on the seat seat side via the lever 83 provided. .

Therefore, the inclination angle of the seat back 62 is detected by detecting the relative turning motion between the case 81 and the seat seat side plate 98, and the case supporting member 37 is connected to the seat support member 37 via the inner cable 92. It is linked to the reclining angle of the back 62. Seat back side plate 197 integrally formed with case 81
Is provided with a first mounting hole 197a, and the seat-side plate 198 is provided with a second mounting hole 198a and a third mounting hole 198b. In the second embodiment, the seat back side plate 197 and the case 8
Although 1 is integrally molded, it may be a separate member.

The seat seat side plate 198 is provided with a shaft member 199 serving as a rotation axis of the angle detecting means 170 provided concentrically with the adjustment axis of the seat back 62. The shaft member 199 is attached so as to penetrate both the seat side plate 198 and the hole 83c of the lever 83. The shaft member 199 is provided with a hole 199a as a circular concave portion, and the hole 199a is formed in the convex portion 175 of the rotation shaft 177.
Mates with The hole 199a does not have to penetrate.

Therefore, centering is first performed by the hole 199a and the convex portion 175, and then the first mounting hole 197a of the seat back side plate 197, the second mounting hole 198a of the seat seat side plate 198, and the third mounting hole. Hole 1
98b are respectively connected to the first mounting holes 171a of the first plate 171 and the second mounting holes 17a of the second plate 172.
2a and the third mounting hole 172b, and the angle detecting means 170 is bolted to the seat back 162 or the seat 1
63.

Here, the hole 19 of the angle detecting means 170
9a is fitted to the convex portion 175 of the seat rotation shaft 177, so that the adjustment axis of the seat back 162 and the rotation axis of the angle detecting means 170 can be matched.
Therefore, since the rotation angle of the seat back 162 and the rotation angle of the angle detection means 170 match, the direction of the sensor case 36 can be accurately adjusted by the transmission means 90. In addition, the shaft member 199 and the projection 1 that fit together
Since only 75 is provided, there is no increase in manufacturing cost.

Further, also in this embodiment, bolts are loosely fitted in the first mounting holes 197a of the seat back side plate 97 and the second mounting holes 198a and the third mounting holes 198b of the seat seat side fixing member 198. The first plate 17 which is a portion to be attached,
Even if the first mounting hole 171a and the second mounting hole 172a and the third mounting hole 172b of the second plate 172 are misaligned, they can be fixed. The first mounting hole 197a, the second mounting hole 198a, and the third mounting hole 198b.
May be formed in a long hole. Accordingly, the angle detecting means 70 can tolerate a shift in the mounting pitch with respect to the seat back 62, and high dimensional accuracy is not required, so that manufacturing costs can be reduced.

The angle detecting means according to the second embodiment is provided with a temporary fixing means using the pins and holes of the first embodiment.
Naturally, it is also possible to apply the temporary fixing means using the block member of the first modified example and the temporary fixing means using the cut-and-raised portion and the projecting portion of the second modified example.

The configurations of the lock means, the vehicle body acceleration sensor, and the like in the present invention are not limited to the above-described embodiment, but can be appropriately changed and improved based on the gist of the present invention. For example, a configuration may be adopted in which the pawl is engaged with the internal teeth of the retractor base and locked instead of the latch plate serving as the locking means. In addition, the shape of the concave and convex portions provided on the rotation axis of the seat back and the rotation axis of the angle detecting means that are fitted to each other is not limited to a circular shape, but may be a polygonal shape or any other configuration that can be fitted. It is not limited to the embodiment described above.

[0060]

As described above, in the vehicle body acceleration sensor for a seat belt according to the present invention, the seat rotation axis of the seat back and the rotation axis of the angle detecting means are provided with concave and convex portions to be fitted to each other. Therefore, the rotation axis of the seat back coincides with the rotation axis of the angle detecting means only by fitting the concave and convex portions.
Therefore, since the rotation angle of the seat back matches the rotation angle of the angle detection means, the direction of the sensor case can be accurately adjusted by the angle detection means. In addition, since the concave and convex portions to be fitted with each other are merely provided on the seat rotation axis of the seat back and the rotation axis of the angle detecting means, the cost can be reduced. Further, in order to perform an accurate adjustment, preferably, the angle detecting means has a mounting hole through which a bolt for mounting the angle detecting means to the mounting portion penetrates, and the mounting hole is loosely fitted with the bolt. Because of the stupid hole, deviation of the mounting pitch of the sheet from the mounting part can be tolerated, and high dimensional accuracy is not required.
Manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a reclining type seat according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of the seat belt retractor according to the first embodiment of the present invention.

FIG. 3 is a sectional view of the seat belt retractor according to the first embodiment of the present invention.

FIG. 4 is a partially enlarged view of the reclining type seat according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram of an angle detecting unit according to the first embodiment of the present invention.

FIG. 6 is an exploded perspective view of the angle detecting means according to the first embodiment of the present invention.

FIG. 7 is a first modification of the temporary fixing means.

FIG. 8 is a second modification of the temporary fixing means.

FIG. 9 is a partially enlarged view of a reclining type seat according to a second embodiment of the present invention.

FIG. 10 is a schematic diagram of an angle detection unit according to a second embodiment of the present invention.

FIG. 11 is a schematic diagram for explaining a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retractor base 1a, 1b Side plate 2 Bobbin 4 Take-up shaft 4a Latch plate 11 Pole 13 Latch cup 19 Ratchet wheel 31 Sensor arm 32 Body acceleration sensor 33 Inertial body 36 Sensor case 37 Case support member 61 Reclining seat 62 Seat back 63 Seat seat part 70 Angle detection means 75 Depression 90 Transmission means 99 Convex member 100 Retractor for seat belt 170 Angle detection means 175 Convex part 199 Shaft member 199a Hole 300 Emergency lock mechanism

Claims (1)

[Claims] 1. A sensor case movably supported by a retractor base attached to a seat back of a reclining type seat of a vehicle or the like, and a rotation of a winding shaft on which a webbing is wound in a webbing pull-out direction is locked. A sensor arm rotatably attached to the sensor case or the retractor base so as to be located at a first position for operating the locking means to be activated and a second position for not operating the locking means, respectively; In response to a change in speed, the inertial body that relatively moves on the inertial body support surface of the sensor case and moves the sensor arm to the first position, and the orientation of the inertial body support surface is inclined 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 maintained properly regardless of the A vehicle acceleration sensor for a seatbelt, wherein the locking means is operated by a movement operation of the inertial body when a predetermined vehicle acceleration is applied.