JPH0616845Y2 - Seat belt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a seat belt device in which a take-up device in which a occupant restraining webbing is taken up by urging force is supported by a seat back of a seat for occupant seating. Regarding

[Prior Art] In this type of seat belt device, for example, as shown in FIGS. 5 and 6, a front end portion of a frame supporting the webbing, an end portion of a webbing entrance / exit of a cover arranged so as to cover the frame, and the like. The winding device 3 including the webbing guide portion 2 for guiding the movement of the webbing 1 is fixed to the shoulder portion of the seat back 4 so that the webbing guide portion 2 faces the front of the seat (arrow F). The occupant seated on the seat grips the webbing 1 or a tongue plate (not shown) supported at one end of the webbing 1 and pulls out the seat back 4 diagonally in a direction transverse to the winding attachment force,
The webbing 1 can be mounted by engaging with a buckle device (not shown) supported at or near the side of the sheet cushion (not shown) of the sheet.

[Problems to be Solved by the Invention] However, as described above, the webbing 1 is pulled out in the direction diagonally traversing the seat back 4 via the webbing guide portion 2 which is opened toward the front of the seat.
There is a problem that the widthwise end of the webbing 1 is brought into sliding contact with the webbing guide portion 2 and the feeling of pulling out the webbing 1 is deteriorated.

Further, when the occupant moves his / her body in the webbing device and the webbing 1 is pulled out by the occupant, the same problem as described above occurs.

In consideration of the above facts, the present invention has an object to obtain a seat belt device in which sliding contact between the webbing and the webbing guide portion can be prevented, and thereby the feeling of pulling out the webbing is improved.

[Means for Solving the Problems] In the seat belt device of the present invention, the webbing that is mounted on the occupant to restrain the occupant to the seat is wound by the winding device by the webbing winding attachment force, and the webbing attachment force is also applied. In a seat belt device that is pulled out from a guide portion of a winding device against the above-mentioned condition, the winding device is rotatably supported on a shoulder portion of a seat back of the seat, and the direction of the guide portion is changed with the rotation. A pivotal support means, and biasing the winding device around the pivotal support means to a predetermined position,
The rotation biasing force is set to be weaker than the webbing winding attachment force so that the winding device can be rotated so that the guide portion is directed in the webbing pull-out direction by pulling out the webbing against the webbing winding attachment force. It is characterized by having means and.

[Operation] According to the above configuration, the winding device is rotationally urged to the predetermined position by the rotational urging means, and the rotational urging force is weaker than the webbing winding attachment urging force. When the occupant seated on the seat pulls out the webbing to install the webbing,
When the webbing is pulled out, the winding device is rotated so that the guide portion faces the webbing pulling-out direction.

This prevents the guide portion from slidingly contacting the widthwise end portion of the webbing.

Further, even when the occupant moves the body after the webbing is mounted and the webbing is pulled out, the webbing is pulled out from the guide portion, and the winding device is rotated so that the guide portion faces the webbing pull-out direction. The sliding contact between the portion and the widthwise end of the webbing is prevented.

[Advantages of the Invention] As described above, according to the present invention, the sliding contact between the webbing and the guide portion of the winding device can be prevented, so that the excellent feeling of pulling out the webbing can be obtained.

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 3 and 4, the seat 10 includes a seat cushion 12 and a seat back 14. The seat cushion 12 includes a box-shaped frame body 16 and a pair of elongated seat tracks 18 extending in the vehicle front-rear direction (directions of arrows F and R) along both sides of the frame body 16. . The seat track 18 is supported by a seat rail 20 fixed to the vehicle body so as to be movable in the vehicle front-rear direction. Therefore, the seat 10 can be moved in the front-rear direction of the vehicle by a driving device (not shown) (manually may be selected) in accordance with the physique of an occupant and can be locked at a predetermined position by locking means (not shown).

The seat back 14 is a connecting portion 22 that connects a parallel portion 22A parallel to each other to a long pipe and one end portion of the parallel portion 22A.
The seat back frame 22 is formed in a substantially U-shape so as to include B and B. The tip of the frame 22 is provided with a pin 24 on the rear end of the vehicle of the seat track 18.
Is pivotally supported by. In addition, the parallel portion 22 of the frame 22
Between A and the spring 2 at a predetermined interval along the longitudinal direction.
The seat back 14 is cushioned by the 6's. Further, a rod 28 is hung and fixed between the parallel portions 22A in the vicinity of the tip of the parallel portion 22A, and is reinforced against the bending force acting on the tip of the parallel portion 22A.

A winding device 32 (details will be described later) is supported via a bracket 30 on one side of the connecting portion 22B of the frame 22 near the parallel portion 22A.

The seat 10 is provided with a reclining mechanism 34 for reclining the seat back 14.

The reclining mechanism 34 includes a long feed screw 36 extending in the vehicle front-rear direction along the seat track 18 on the side where the winding device 32 is supported, and the feed screw 3.
A drive means for rotating 6 and the feed screw 36 are screwed together, and a slider 38 that is moved in the vehicle front-rear direction according to the rotation of the feed screw 36 and a connecting member 39 that connects the slider 38 and the bracket 30. I have it.

The driving means includes a motor 40 arranged in the frame body 16 and gear means 42 for rotating the feed screw 36 by rotation of the output shaft of the motor 40. Therefore, when the motor 40 is rotated in the forward direction by a switch (not shown), the drive means is a slider 3 via the gear means 42 and the feed screw 36.
8 is moved in the direction of arrow R in FIG. 3, and when the motor 40 is rotated in the opposite direction, the slider 38 is moved in the direction of arrow F in FIG. 1 via the gear means 42 and the feed screw 36. .

The connecting means 39 includes a rod 46 whose one end is axially supported by the slider 38 by a pin 44, a rod 48 whose one end is axially supported by the pin 24 coaxially with the frame 22, and a pin 50 which is one end.
The rod 5 is pivotally supported by the bracket 30 at the other end and is coaxially supported by the pin 52 at the other end coaxially with the other ends of the rod 46 and the rod 48.
4 and.

Accordingly, the movement of the slider 38 in the direction of arrow R causes the rod 48 to rotate in the direction of arrow A in FIG.
4, the frame 22 is also rotated in the direction of arrow A to recline the seat back 14, the movement of the slider 38 in the direction of arrow F causes the rod 48 to rotate in the direction of arrow A, and the rod 54 also rotates the frame 22 in the direction of arrow. The seat back 14 is returned to its original position by being rotated in the A direction.

As shown in FIG. 1, the winding device 32 has a frame 60 having a rectangular base portion 56 and a pair of leg plate portions 58 extending from both sides of the base portion 56 in parallel with each other.
And a winding shaft 62 pivotally supported between the leg plate portions 58,
Is equipped with. One end of a long occupant restraining webbing 64 is locked to the winding shaft 62, and the webbing 64 is wound by the urging force of a mainspring (not shown). A tongue plate 65 is supported on the other end of the webbing 64.
5 is pulled out and the webbing 64 is pulled out in a direction diagonally crossing the seat back 14, and the tongue plate 65
Is engaged with a buckle device 67 arranged on the side of the seat cushion 12, so that the occupant can be put on the webbing.

A through hole 66 is formed in the base portion 56 of the frame 60, and the winding device 32 is axially supported by the bracket 30 embedded in the seat back 14 by a bolt 68 through the through hole 66. A notch 69 formed at the seat back 14 at one end and at the base portion 56 of the frame 60 at the other end
The bolt 68 penetrates the coil portion of the coil spring 70 that is locked to. Therefore, the winding device 32 is always provided with the second spring around the bolt 68 by the coil spring 70.
It is biased in the direction of arrow B (counterclockwise direction). Further, the frame 60 of the winding device 32 is urged in the direction of arrow B.
The seat back 14 is provided with a positioning projection 72 that abuts against the side surface of the webbing device 32 to position the winding device 32 at a predetermined position. ). The urging force of the coil spring 70 is set to be weaker than the urging force of the webbing winding acting on the webbing 64 when the occupant wears the webbing 64. Therefore, when the webbing 64 is pulled out from the winding device 32, the winding device 32 is rotated around the bolt 68 along the pulling direction of the webbing 64.

The winding device 32 includes a cover 74 that covers the winding shaft 62 and the frame 60, and the webbing 64 is pulled out through an opening 76 that forms a guide portion through which the webbing 64 formed on the cover 74 is pulled out. Has become. Further, the winding device 32 is provided with an inertial locking mechanism (not shown) so that the unwinding of the webbing 64 is instantaneously stopped when the vehicle is suddenly decelerated.

The operation of this embodiment will be described.

When the occupant gets on the seat 10 and winds up, the winding device 3
2 is located in the state shown by the solid line in FIG. 2 by the biasing force of the coil spring 70. In order to set the seat according to the physique of the occupant, the seat cushion 12 is moved in the vehicle front-rear direction (directions of arrows F and R) by a driving device (not shown) and locked by the locking means, and further, the seat back 14 is driven by the motor 40. May be rotated in the direction of arrow A or in the direction of arrow A.

Next, the passenger holds the tongue plate 65 and webbing 64.
If the tongue plate 65 is engaged with the buckle device 67, the webbing can be mounted by pulling out the tape from the winding device 32 obliquely downward. At this time, since the biasing force of the coil spring 70 is set to be weaker than the webbing winding attachment force that acts on the webbing 64 when the occupant wears the webbing, the winding device 32 is rotated around the bolt 68 in the webbing pull-out direction. It is possible to prevent the widthwise end portion of the webbing 64 from slidingly contacting the opening 76 of the cover 74, the tip end portion of the leg plate portion 58, or the like.

When the vehicle is rapidly decelerated while the occupant is wearing the webbing, the inertial locking mechanism works to instantly stop the unwinding of the webbing 64. At that time, the inertial force acting on the occupant acts as a load for pulling the winding device 32 in the arrow F direction. On the other hand, since the rod 54, the frame 22, the rods 48 and 46 are connected by the pins 50, 24, 52 and 44 to form a truss structure, the load in the arrow F direction is applied to the rod 54, the frame 22, the rods 48 and 46. Does not act as a bending stress, but only acts as an extension force or a compression force on each rod 54, the frame 22, the rod 48, and the like. Therefore, this load is surely supported by the rod 54, the frame 22, the rod 48, and the like.

Next, when the occupant gets off the vehicle, if the engagement between the tongue plate 65 and the buckle device 67 is released, the webbing 64 is automatically wound around the winding shaft 62 by the webbing winding attachment force of the winding device 32. At that time, the winding device 32 is moved around the bolt 68 by the urging force of the coil spring 70.
It can be rotated from the position indicated by the imaginary line to the position indicated by the solid line.

Further, even when the occupant moves his body after the webbing 64 is attached and the webbing 64 is pulled out, the webbing 64 is pulled out from the opening 76, and the winding device 32 is rotated so that the opening 76 faces the webbing pulling-out direction. Move,
Sliding contact between the opening 76 and the widthwise end of the webbing 64 is prevented.

As described above, in the present embodiment, the winding device 32 is configured so that the bolt 6 is arranged so as to be substantially parallel to the pulling-out direction of the webbing 64.
Since it is rotated around 8, the webbing 64 and the cover 74
The sliding contact with the opening 76 and the edge of the leg plate portion 58 of the frame 60 is prevented.

Further, the load acting on the winding device 32 in case of an emergency of the vehicle can be reliably supported by the truss structure by the pins 52, 24 of the rods 46, 48 and the like.

Next, a second embodiment will be described with reference to FIG.

In the present embodiment, the winding device 32 is the coil spring 1
70 (biasing force acting in the direction of arrow C) and coil spring 1
With 71 (biasing force acting in the direction of arrow D), the opening 176 of the cover 174 is displaced substantially in the webbing pull-out direction (solid line direction in FIG. 7). Therefore, when the webbing is pulled out or mounted, the winding device 32 is maintained in a state substantially indicated by the solid line. On the other hand, when the vehicle is in an emergency, the winding device 32 is rotated around the bolt 68 so that the opening 176 faces the front of the vehicle (direction of arrow F) by the inertial force acting on the occupant. Also in this embodiment, the biasing forces of the coil spring 170 and the coil spring 171 are set to be weaker than the webbing winding attachment force that acts on the webbing 64 when the occupant wears the webbing. Also,
Unlike the first embodiment, the protrusion 72 is not necessary. Other configurations are similar to those of the first embodiment.

Therefore, also in this embodiment, the winding device 32 is adapted to rotate around the bolt 68 following the webbing withdrawing direction, and the webbing 64 has the opening 76 of the cover 74 and the frame 60 and the leg plate portion 58. It is prevented from sliding on the front end of the.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an assembly of a seat belt device according to the present invention to a seat back of a winding device, and FIG. 2 is a plan view illustrating rotation of the winding device with respect to a seat back.
FIG. 3 is a side view showing a seat reclining mechanism, FIG. 4 is a front view of the seat shown in FIG. 3, FIG. 5 is a perspective view showing a state in which a seat back of a conventional winding device is attached, and FIG. FIG. 5 is a plan view and FIG. 7 is a plan view showing a second embodiment of the present invention. 10 ... Seat, 14 ... Seat back, 32 ... Winding device, 68 ... Bolt, 70, 170, 171 ... Coil sprue.

Claims (1)

[Scope of utility model registration request] 1. A webbing mounted on an occupant for restraining the occupant to a seat is taken up by a winding device by a webbing winding attachment force and pulled out from a guide portion of the winding device against the webbing attachment force. In the seat belt device described above, the winding device is rotatably supported on the shoulder portion of the seat back of the seat, and the support device changes the direction of the guide portion according to the rotation, and the winding device is rotatably supported. Rotate and bias around the means to a predetermined position,
The rotation biasing force is set to be weaker than the webbing winding attachment force so that the winding device can be rotated so that the guide portion is directed in the webbing pull-out direction by pulling out the webbing against the webbing winding attachment force. A seat belt device comprising: