JP2000085528A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of preventing it from being used at improper positions. SOLUTION: This device is equipped with a locking means locking the rotation of a take-up shaft in the direction that its webbing is taken out, and with a detection means enabling the rocking means to be operated upon sensing specified acceleration and specified inclination by means of the movement of an inertial body, and a seat back 3 can be mounted to a seat capable of being inclined to the forward direction of a car body by releasing the connection of a seat back side connection member 12 provided for the seat back 3 with a car body side connection member 9 provided for the car body at the back face side of the seat back 3. When the connection of the seat back side connection member 12 with the car body side connection member 9 is released, the draw out of the webbing W can thereby be checked by a checking means 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device in which a seat back is attached to a seat capable of leaning forward to the front of a vehicle body.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Sho 63-176755 discloses a seat belt device in which a retractor of a seat belt device for securely holding a vehicle occupant or the like in a seat is mounted in a seat back of a reclining type seat of a vehicle or the like. Etc. This seatbelt device includes a webbing retractor built in a seatback that can lean forward to the front of the vehicle body, and a webbing passage extending in a vehicle front-rear direction near a portion of the seatback that supports a shoulder of an occupant. Is formed, and a through-anchor for hanging the webbing extended from the retractor so as to face the webbing passage is attached to the vehicle body constituting wall on the seat back rear side, and from the through anchor through the webbing passage. The webbing extending to the front side of the seat back is configured to be connectable to the vehicle body.

In this seat belt device, an engaging pin (hook) provided below the retractor and a striker (ring-shaped member) protruding from a vehicle body forming wall on the back side of the seat back are configured to be disengageable. Have been. The engagement pin is connected to the lower end of the operation rod exposed at the upper end of the seat back, and by displacing the operation rod upward, the engagement between the engagement pin and the striker is released, and the seat back is disengaged. Is configured to be able to be moved forward to the front of the vehicle body. In addition, the occupant can sit down even if the engagement between the engagement pin and the striker is released and the seat back slightly tilts forward.

[0004]

A seat belt device having an emergency lock mechanism senses the acceleration and inclination of the vehicle body by moving the inertial body, and operates the locking means by moving the inertial body. Means.
This sensing means performs its original function while the inertial body is properly supported. When this type of sensing means is provided in the seat belt device described in Japanese Utility Model Application Laid-Open No. 63-176755, when the seat back is tilted forward so that the occupant cannot sit down, the sensing means senses the inclination and locks the seat back. Activate However, when the engagement between the engagement pin and the striker is released and the seat back tilts slightly forward, the inertial body is supported in a state where the locking means is not operated, but in this state, The inertial body easily moves in a predetermined direction (for example, forward), and hardly moves in the opposite direction. Therefore, the sensitivity of the inertial body to the acceleration and the inclination of the vehicle body varies, and the original function of the sensing means may not be exhibited. However, the occupant can be seated and the webbing can be mounted as described above, and it is not desirable for the occupant to use the webbing in such a state.

[0005] In view of such circumstances, an object of the present invention is to provide a seat belt device capable of preventing use at an inappropriate position.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a locking means for locking the rotation of a winding shaft in a webbing pull-out direction, and a method of detecting a predetermined acceleration and inclination by movement of an inertial body. A seatback-side connecting member provided on the seatback and a vehicle-body-side connecting member provided on the vehicle body on the rear side of the seatback, thereby releasing the connection of the seat. In a seat belt device in which a back is attached to a seat capable of leaning forward to the front of the vehicle body, blocking means is provided for preventing the webbing from being pulled out when the connection between the seat back side connecting member and the vehicle body side connecting member is released. The present invention is attained by providing a seat belt device characterized in that:

According to the above construction of the present invention, when the connection between the seat back side connecting member and the vehicle body side connecting member is released, the webbing is prevented from being pulled out by the blocking means. Therefore, at an inappropriate position where the seat back is not fixed to the vehicle body, the webbing cannot be pulled out, and it is not preferable to use the webbing. It is possible to recognize that the seat back is not fixed.

The blocking means for preventing the webbing from being pulled out includes, for example, a configuration in which the webbing is clamped in conjunction with the release of the connection between the seat back side connecting member and the vehicle body side connecting member. Further, as another configuration of the blocking means, there is a configuration in which the locking means for locking the webbing withdrawal is forcibly activated in conjunction with the release of the connection between the seat back side connecting member and the vehicle body side connecting member.

[0009] The blocking means may be incorporated in the retractor itself. Also, it is naturally possible to provide it outside the retractor. In this case, it may be inside or outside the seat back.

[0010]

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 is a schematic side view of a vehicle seat according to a first embodiment of the present invention at an occupant seating use position, and FIG. 2 is an enlarged view of a portion surrounded by A in FIG.

As shown in FIG. 1, in the seat belt device 1 of the first embodiment, one end of the webbing W is held by a retractor 10 mounted in the seat back 3 so as to be wound up and pulled out. . The seat back 3 is rotatable about a rotation axis K by a hinge mechanism 6 with respect to the seat cushion 4.

The seat back 3 according to the first embodiment.
Is a type in which the seating position is fixed only to the position shown in FIG. 1 and the reclining angle at the time of sitting cannot be adjusted and fixed. Although the reclining angle of the seat back 3 cannot be adjusted, the lock of the seat back 3 with respect to the vehicle body can be released by operating the lever 5 provided at the upper end of the seat back 3 and the seat back 3 can be tilted forward.

As shown in FIG. 2, a hook 12 as a seatback-side connecting member is attached to the seatback 3 above the retractor 10 so as to be rotatable about a rotation shaft 12a. Connecting portion 12b of this hook portion 12
Is a connecting portion 9a of a ring-shaped member 9 as a vehicle body-side connecting member protruding from a vehicle body forming wall 7 on the back side of the seat back 3.
And can be disengaged. When the lever 5 is pushed downward, a hook (not shown) rotates the hook 12 clockwise. When the hook 12 rotates clockwise about the rotation shaft 12a in conjunction with the pressing operation of the lever 5, the connection state between the hook 12 and the ring-shaped member 9 is released. ing. In addition,
The mechanism for releasing the connection between the hook 12 and the ring-shaped member 9 is not limited to the mechanical configuration including the lever 5, but may be configured such that the hook 12 is rotated by an electric force or a hydraulic pressure by a button operation. .

Here, in this embodiment, since the retractor 10 for winding the webbing W around the seatback 3 is built in, the force applied to the webbing W is directly transmitted to the seatback 3. However, since the hook 12 and the ring-shaped member 9 connect the seat back 3 and the vehicle body forming wall 7, even if the webbing tensile force acts, the tensile force can be reduced. It can play a reinforcing role.

The retractor 10 includes a webbing W
A holding mechanism 11 is provided, which is a blocking means for preventing the pull-out. The clamping mechanism 11 includes an upper plate 13 fixed to the retractor base 10a, a clamp member 15 (shown by hatching for convenience) movable in the A and B directions along the side surface of the upper plate 13, and the clamp member 15 , The lower plate 19 attached to the retractor base 10a and disposed opposite the teeth 15a of the clamp member 15, and the retractor base 10a around the rotation shaft 17a. The clamp lever 17 having the notch 17c attached to support the pivot 15c of the clamp member 15
And the retractor base 10 around the rotating shaft 18b.
The arm 18 has an abutment portion 18a abutting against and supported by a receiving portion 8 provided on the vehicle body configuration wall 7 and a projection 10c of the retractor base 10a. The spring 18 has the other end locked to the portion 18c. At the position shown in FIG. 2, the projection 17b of the clamp lever 17 and the arm 18 are not in contact.

The clamp lever 17 has a rotating shaft 17a.
Is rotated clockwise about the clamp member 15.
Is moved in the direction B along the side surface of the upper plate 13, and the webbing W is sandwiched between the clamp member 15 and the lower plate 19, so that the webbing W can be prevented from being pulled out. The pinching mechanism 11 pinches the webbing W in an emergency in order to solve the problem that the webbing W wound around the winding shaft is tightly wound by the tension acting on the vehicle in an emergency and the webbing W is extended. Thus, the webbing W can be operated in conjunction with the locking means so as to minimize the extension of the webbing W, and can also be operated when the seat back 3 is unlocked.

FIG. 3 is a schematic side view showing a state in which the seat back 3 of FIG. 1 is slightly tilted forward from an occupant seating use position, and FIG. 4 is an enlarged view of a main part of FIG.

As shown in FIG. 3, the seat back 3 is
When leaning forward from the occupant seated state, first use lever 5
Operate. In conjunction with the operation of the lever 5, the hook 12 rotates clockwise about the rotation shaft 12a as described above. Then, the connection between the connecting portion 12b of the hook 12 and the connecting portion 9a of the ring-shaped member 9 is released. In this state,
Since the sensing means for sensing the acceleration and inclination of the vehicle body is tilted and the support state of the inertial body is slightly changed, there is a possibility that the original function of the sensing means cannot be sufficiently exhibited.

When the seat back 3 is lowered toward the front of the vehicle, the contact portion 18a of the arm 18 separates from the receiving portion 8 of the vehicle body constituting wall 7, and as shown in FIG. The arm 18 turns clockwise around the turning shaft 18b. Then, the arm 18 comes into contact with the projection 17b of the clamp lever 17, and the clamp lever 17
Is also rotated clockwise about the rotation shaft 17a.

When the notch 17c pushes the pivot 15c of the clamp member 15 against the urging force of the return spring 16, the clamp lever 17 moves the clamp member 15 along the side surface of the upper plate 13. B in the direction B, the webbing W is sandwiched between the clamp member 15 and the lower plate 19, and the teeth 15 of the clamp member 15
The biting of the webbing W prevents the webbing W from being pulled out. That is, when the seat back 3 is not at the proper position where the hook 12 and the ring-shaped member 9 are connected, the webbing W can be used because the webbing W can be prevented from being pulled out as well as being caught by holding the webbing W. It is possible to avoid using the webbing W at a seatback position where seating is not appropriate and it is possible to recognize that the seatback 3 is not fixed.

When the seat back 3 is tilted from the state shown in FIG.
The hook 12 first rotates clockwise about the rotation shaft 12a because the tapered surface 12c of the lower surface of the hook 12 is pressed by the ring-shaped member 9. Then, after the tapered surface 12c has passed through the connecting portion 9a, the tapered surface 12c is rotated counterclockwise by its own weight or by urging means (not shown), and returns to the state of FIG. In this state, since the webbing W has been released from being pinched, the webbing W can be used, and the sensing means can also sufficiently perform its original function.

Next, a second embodiment of the present invention will be described. FIG. 5 is a schematic side view of the retractor in the occupant seating use position of the seat belt device according to the second embodiment of the present invention, and FIG. 6 shows a state in which the seat back is slightly tilted forward from the occupant seating use position. 1 is a schematic side view of a retractor of FIG.

As shown in FIG. 5, the retractor 30 according to the second embodiment is provided with sensing means 31 for detecting the acceleration and inclination of the vehicle body. The sensing means 31 includes a spherical inertia body 33, a sensor case 35 on which the inertia body 33 is placed, and a tooth of a ratchet wheel 39 which is rotatably attached to the sensor case 35 about a rotation shaft 37 a. And a compatible sensor arm 37.

Therefore, when the inertial body 33 of the sensing means 31 senses the acceleration of the vehicle body in a vehicle emergency, the inertial body 33
Moves on the sensor case 35, the sensor arm 37 rotates clockwise around the rotation shaft 37a, and when the tip of the sensor arm 37 engages with the teeth of the ratchet wheel 39, the ratchet wheel 39 is moved. The rotation of the webbing W with respect to the take-up shaft (not shown) is delayed, and the locking means is operated to lock the rotation of the take-up shaft in the webbing pull-out direction.

A lever 38 is provided on a side surface of the retractor base 30a so as to be rotatable about a rotation shaft 38a, and is a blocking means for preventing the webbing W from being pulled out. The lever 38 has a U-shaped portion 38c.
Are urged by a spring 39. In the occupant seating use position shown in FIG. 5, since a force is applied to the U-shaped portion 38c of the lever 38 in the direction C against the urging force of the spring 39, the pressing portion 38c of the lever 38 and the sensor arm The rear end 37b of the 37 is not in contact. However, when the connection between the seat back side connection member and the vehicle body side connection member is released, the pressing force in the C direction is released in conjunction with the operation. As a method of releasing the pressing force in the C direction, for example, when the seatback-side connecting member and the vehicle-body-side connecting member are connected, the U-shaped portion 38c is used.
Is provided, and the pressing member moves upward in conjunction with the operation of the lever, thereby forming the U-shaped portion 38c.
The pressing member is brought into a non-contact state, and the pressing force is released.

When the seat back is tilted forward from the occupant seating position shown in FIG. 5, first, a lever protruding from the upper end of the seat back is operated as in the first embodiment. When the lever is operated, the connection between the seat back side connecting member and the vehicle body side connecting member is released in conjunction with the operation.

When the seat back is tilted toward the front of the vehicle, the pressing force in the direction C is released, and the arm 38 is rotated clockwise about the rotation shaft 38a by the urging force of the spring 39. Then, as shown in FIG.
Of the sensor arm 37 abuts on the rear end 37b of the sensor arm 37, and the sensor arm 37 rotates clockwise about the rotation shaft 37a. Then, the tip of the sensor arm 37 and the teeth of the ratchet wheel 36 mesh with each other, the locking means operates, and the webbing is prevented from being pulled out. That is, when the seat back is not at the proper position, the locking means is forcibly operated by a mechanical method so that the webbing W cannot be pulled out, and it is not preferable to use the webbing W. The use of the webbing in the position can be avoided, and it can be recognized that the seat back is not fixed.

When the seat back is tilted from the state of FIG. 6 to the normal position toward the rear side of the vehicle in FIG. 5, C shown in FIG.
When the arm 38 rotates counterclockwise about the rotating shaft 38a, the pushing portion 3 of the arm 38 is actuated.
8b and the rear end 38b of the sensor arm 37 do not come into contact with each other.
It turns around 7a and returns to the state shown in FIG. 5 again. In this state, the meshing state has been released,
The use of the webbing W becomes possible, and the sensing means can sufficiently exhibit its original function.

Next, a third embodiment of the present invention will be described. FIG. 7 is a schematic side view of the retractor in the seatbelt device according to the third embodiment of the present invention at an occupant seating use position.

As shown in FIG. 7, the retractor 40 according to the third embodiment also has a sensing means 41 for detecting the acceleration and inclination of the vehicle body, as in the second embodiment. This sensing means 41 also includes an inertia body 43, as in the second embodiment,
It comprises a sensor case 45 on which the inertial body 43 is mounted, and a sensor arm 47 attached to the sensor case 45 so as to be rotatable around a rotation shaft 47a. The operation of the sensing means 41 is the same as that of the second embodiment, and will not be described.

The rotating shaft 4 is provided on the retractor base 40a.
A movable part 50 and a stopper 48 that can rotate around the
And a solenoid 49 which slidably accommodates
The transmission member 51 connected to one end of the webbing 9 is provided as blocking means for blocking the webbing W from being pulled out. The protrusion 50 a of the movable part 50 of the solenoid 49 is connected to the hole 48 c of the stopper 48.

When the seat back is tilted forward from the occupant seating state shown in FIG. 7, first, a lever protruding from the upper end of the seat back is operated as in the first and second embodiments. When the lever is operated, the connection between the seat back side connecting member and the vehicle body side connecting member is released in conjunction with the operation.

When the seat back is lowered toward the front of the vehicle, a solenoid (not shown) for detecting disconnection between the seat back side connecting member and the vehicle body side connecting member is transmitted through the solenoid 51 through the transmission member 51. When the movable portion 50 moves upward in the drawing by operating the 49, the stopper 48 connected to the movable portion 50 rotates clockwise about the rotation shaft 48a. Then, the claw portion 48b of the stopper 48 meshes with the teeth of the ratchet wheel 46, and the locking means is operated, thereby preventing the webbing from being pulled out. That is, when the seat back is not at the proper position, the locking means is forcibly activated by the electric means, so that the webbing W cannot be pulled out, and it is not preferable to use the webbing W. The use of the webbing W at the position can be avoided, and it can be recognized that the seat back is not fixed. Here, as the electrical means, for example, means for detecting disconnection between the seatback-side connecting member and the vehicle-body-side connecting member when the electrical contacts come into contact with each other can be mentioned.

When the seat back is tilted to the normal position toward the rear of the vehicle in the figure, the electric means does not operate, the solenoid 49 does not operate, and the movable part 50 moves downward in the figure. Accordingly, the stopper 48 connected to the movable portion 50 rotates counterclockwise about the rotation shaft 48a, and the engagement between the claw portion 48b of the stopper 48 and the teeth of the ratchet wheel 46 is released. In this state, since the meshing state has been released, the webbing W can be used, and the sensing means can also sufficiently exhibit the original function.

Next, a fourth embodiment of the present invention will be described. FIG. 8 is a schematic side view of a seat belt device according to a fourth embodiment of the present invention at an occupant seating use position, and FIG. 9 is a state in which the seat back of the seat belt device of FIG. It is an outline side view of the state where it fell down.

As shown in FIG. 8, on the upper part of the retractor 70 in the drawing, a hook 72 as a seat back side connecting member is rotatable about a rotation shaft 72a as in the above-described embodiment. It is attached to the back 63. The connecting portion 72b of the hook portion 72 can be engaged with and disengaged from a connecting portion 69a of a ring-shaped member 69 serving as a vehicle-body-side connecting member protruding from a vehicle-body-forming wall 67 on the rear side of the seat back 63.

At the upper part of the retractor 70 in the figure, rightward in the figure of the ring-shaped member 69, there is provided a holding mechanism 81 functioning as a blocking means for preventing the webbing W from being pulled out. The pinching mechanism 81 has a side surface supported by the connecting portion 69a of the ring-shaped member 69 and a plate 87 having two pins 87a. The plate 87 is wound around the pins 87a of the plate 87 and urges the plate 87 to the left in the drawing. A compression coil spring 86, a first clamp member 85 fixed to the seat back 63, a pin 87a is slidably supported in the hole, and the compression coil spring 86 is supported on a side surface thereof;
It is configured to include a first clamp member 85 fixed to the pin 87a of the plate 87 and a second clamp member 89 that is arranged to face through the webbing W.

As shown in FIG. 9, when the seat back 63 is tilted forward from the occupant seating use state shown in FIG. 5, the lever 65 is first operated. When the lever 65 is operated, the hook 72 rotates clockwise about the rotation shaft 72a in conjunction with the operation. Then, the connection between the connecting portion 62b of the hook 72 and the connecting portion 69a of the ring-shaped member 69 is released.

When the seat back 63 is tilted toward the front of the vehicle, the side surface of the plate 87 is no longer supported by the connecting portion 69a of the ring-shaped member 69. And the second clamp member 89 fixed to the plate 87 also moves to the left. Therefore, the webbing W is sandwiched between the first clamp member 85 and the second clamp member 89, and the webbing W is prevented from being pulled out. That is, when the seat back 63 is not at the proper position, the webbing W is sandwiched to prevent not only the webbing W from being pulled out but also the webbing W from being caught, so that it is not preferable to use the webbing W. The use of the webbing W at the position can be avoided, and it can be recognized that the seat back is not fixed.

It should be noted that the state of FIG.
Is tilted toward the vehicle rear side in the figure to the proper position, the hook 7
Since the tapered surface 72c of the lower surface of 2 is pressed by the ring-shaped member 69, the hook 72 first rotates clockwise about the rotation shaft 72a. Then, the tapered surface 72c is
After passing through 9a, it rotates counterclockwise by its own weight or by urging means (not shown), the side surface of the plate 87 is supported by the connecting portion 69a of the ring-shaped member 69, and returns to the state of FIG. In this state, since the webbing W has been released from being pinched, the webbing W can be used, and the sensing means can also sufficiently perform its original function.

The structure of the holding means and the structure for forcibly operating the locking means constituting the blocking means of the present invention are as follows.
It is needless to say that the present invention is not limited to the above-described embodiment, but can be appropriately modified and improved based on the gist of the present invention.

[0042]

As described above, in the seat belt device of the present invention, when the connection between the seat back side connecting member and the vehicle body side connecting member is released when the seat back is tilted forward to the front of the vehicle body, the webbing is provided. The webbing cannot be pulled out at an improper position where the seat back is not fixed to the vehicle body, and it is not preferable to use the webbing. The use of the webbing at the back position can be avoided, and it can be recognized that the seat back is not fixed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a seat belt device according to a first embodiment of the present invention at an occupant seating use position.

FIG. 2 is an enlarged view of a portion surrounded by A in FIG.

FIG. 3 is a schematic side view of a state in which the seat back of FIG. 1 has been slightly tilted forward from an occupant seating use position.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a schematic side view of a retractor provided to a seat belt device according to a second embodiment of the present invention at an occupant seating use position.

FIG. 6 is a schematic side view of the retractor in a state where the seat back is slightly forwardly moved from an occupant seating use position from the state of FIG. 5;

FIG. 7 is a schematic side view of a retractor in an occupant seating use position in a seat belt device according to a third embodiment of the present invention.

FIG. 8 is a schematic side view of a seat belt device according to a fourth embodiment of the present invention at an occupant seating use position.

9 is a schematic side view of the seat belt device of FIG. 8 in a state where the seat back is slightly tilted forward;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat belt device 3 Seat back 7 Body construction wall 9 Ring member 12 Hook 11 Clamping mechanism 13 Upper plate 14 Spring 15 Clamp member 16 Return spring 17 Clamp lever 18 Arm 19 Lower plate 38 Lever 39 Spring 48 Lever 49 Solenoid 50 Movable part 51 Transmission Member 72 Hook 79 Ring Member 81 Nipping Mechanism 85 First Clamp Member 86 Compression Coil Spring 87 Plate 89 Second Clamp Member

Claims (1)

[Claims] 1. A seat comprising: locking means for locking rotation of a take-up shaft in a webbing pull-out direction; and sensing means for detecting a predetermined acceleration and inclination by movement of an inertial body and operating the locking means. A seatback-side connecting member provided on the back,
A seat belt device in which the seat back is attached to a seat capable of leaning forward to the front of the vehicle body by releasing the connection of the seat back to a vehicle body-side connecting member provided on the vehicle body on the rear side of the seat back. A seatbelt device comprising a blocking means for blocking the webbing from being pulled out when the connection between the member and the vehicle body-side connecting member is released.