JPH0434122Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an automatic restraint type vehicle seat belt device that automatically attaches a seat belt to an occupant seated on a seat in a vehicle interior.

[Technical background of the invention and its problems]

2. Description of the Related Art Recently, an automatic restraint type seat belt device has been developed as a seat belt device installed in the interior of a vehicle such as an automobile, which automatically attaches a seat belt to an occupant seated on a seat in the vehicle interior.
Figure 9 shows an example of this type of automatic restraint type seat belt device (automatic belt).
1 is a vehicle body, 2 is a front door on the driver's seat side, 3 is a seat body, and 4 is a seat belt device body. The seatbelt device main body 4 is provided with a seatbelt retractor (retractor) 5 disposed at a substantially central position in the vehicle interior in the vehicle width direction. The seatbelt retractor 5 is attached to a backbone of the vehicle body 1 that protrudes upward, for example, at a substantially central position in the vehicle width direction of a floor panel. Further, the tip end of the seat belt webbing 6 let out from the seat belt retractor 5 is attached to a door anchor (fixed part) 7 fixed to the window frame 2a at the top of the front door 2. When the front door 2 is opened, the seatbelt webbing 6 is retracted from the seatbelt retractor 5 as the front door 2 is opened, so that the occupant who has entered the vehicle is seated on the seat body 3. When the front door 2 is closed, the seatbelt webbing 6 is retracted by the seatbelt retractor 5, and the seatbelt webbing 6 (shoulder belt) stretched between the door anchor 7 and the seatbelt retractor 5 retracts the seatbelt webbing 6. The upper body of the occupant is fixed to the seat back 3a of the seat body 3.

By the way, the seat body 3 is generally supported so as to be slidable in the front and rear directions with respect to the vehicle body 1 side.
The seat body 3 can be fixed at an appropriate sliding position by sliding the seat body 3 in the front and rear directions according to the height of the occupant. Therefore, when the seat back 3a is folded forward while the seat body 3 is moved forward with respect to the vehicle body 1, the seat belt webbing 6 is inserted between the seat back 3a and the seat cushion 3b of the seat body 3. There was a risk of being caught. In this way, the seat body 3
If the seatbelt webbing 6 is caught between the seatback 3a and the seat cushion 3b, the resistance force against the pullout operation of the seatbelt webbing 6 increases when the front door 2 is opened, and the front door 2 becomes difficult to open. There was a problem that the operating force required for the operation was large, and there was also a risk that the seat belt webbing 6 would loosen when the front door 2 was closed, and the seat belt webbing 6 would be caught between the front door 2 and the vehicle body.

Therefore, a guide ring 8 for holding the seat belt webbing 6 in an inserted state is provided in front of the seat belt retractor 5, and the guide ring 8 supports the seat belt webbing 6 at a position that prevents interference with the seat back 3a. It is also being considered that a configuration that allows However, in this case as well, the guide ring 8 was attached to the backbone of the floor panel, so as the position of the seat body 3 was adjusted, the distance between the attachment position of the guide ring 8 and the seat back 3a of the seat body 3 increased. In this case, the restraining force of the seat belt webbing 6 to fix the occupant to the seat body 3 may be weakened. Therefore, for example, when a running vehicle causes a collision, there is a risk that the occupant may be pushed forward by inertia force and collide with the steering wheel 9, etc., and the guide ring 8 may also Since it is located near the operating section, there is a risk that it will be difficult to operate the handbrake and the like. Also,
There was also a problem in that the restraining force of the seat belt webbing 6 on the occupant changed depending on the sliding position of the seat body 3.

[Purpose of invention]

This invention prevents interference between the seat body and the seat belt webbing, and also prevents the restraint force of the seat belt webbing from changing depending on the sliding position of the seat body, ensuring that the occupant is always properly restrained. A vehicle seat that can be restrained by force to the seat body, which also prevents a decrease in the operability of hand brakes, etc., and prevents an increase in seat weight to prevent a decrease in seat assembly work efficiency. The object of the present invention is to provide a belt device.

[Summary of the idea]

In this invention, a retractor for retracting the seatbelt webbing is installed at approximately the center of the vehicle interior in the width direction of the vehicle, and the tip of the seatbelt webbing that is unwound from the retractor is attached to the upper part of the vehicle door. In the seat belt device for a vehicle, the upper body of an occupant is fixed to the seat back of the seat by a seat belt webbing fixed to a fixed member and stretched between the fixing member at the upper part of the door and a retracting device. One end of the take-up device is pivotally supported below the seat cushion of the seat, and the other end of the take-up device is rotatable about the one end side when a large impact force is applied to the seat belt webbing. The seatbelt webbing includes an engaging member that engages with a lower part of the seat cushion of the seat, is fixed to the vehicle body floor below the seat cushion of the seat, and extends in the longitudinal direction of the vehicle adjacent to the retractor, and is attached to the seatbelt webbing. When a large impact force is applied and the retractor is rotated, the engaging member and the other end of the retractor engage to transmit the force acting on the seat belt webbing to the vehicle body floor. It is something.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 8. Fig. 1 shows a schematic configuration of an automatic restraint type seat belt device (automatic belt) that automatically fastens a seat belt to a passenger seated on a seat in a vehicle, and 11 is a vehicle body;
12 is a front door on the driver's seat side, 13 is a seat body, and 14 is a seat belt device body. A seatbelt retractor (retractor) 15 of the seatbelt device main body 14 is attached to the lower surface of the seat cushion 13a of the seat main body 13. Inside the seatbelt retractor 15, there are various components such as a winding mechanism for the seatbelt webbing 16 and an emergency lock mechanism that prevents the seatbelt webbing 16 from being fed out when an impact force is applied to the seatbelt webbing 16. The parts are installed. The tip of the seatbelt webbing 16 let out from the seatbelt retractor 15 is attached to one side of the seat cushion 13a of the seat body 13 (a floor panel (vehicle body floor) 41 disposed on the floor of the vehicle body 11). It extends through a belt guide 18 attached to a backbone 17 (side part on the side of a backbone 17 that is protruded upward at approximately the center position in the vehicle width direction), and this extending end is attached to the upper part of the front door 12. It is attached to a door anchor (fixed part) 19 fixed to the window frame 12a. In this case, the belt guide 18 is disposed at a substantially central position in the front-rear direction on one side of the seat cushion 13a, so that interference between the seat body 13 and the seat belt webbing 16 is prevented. When the front door 12 is opened, the seatbelt webbing 16 is retracted from the seatbelt retractor 15 as the front door 12 is opened, so that the occupant who has entered the vehicle is seated on the seat body 13. When the front door 12 is closed, the seatbelt webbing 16 is retracted by the seatbelt retractor 15.
Seat belt webbing 16 stretched between door anchor 19 and seat belt retractor 15
(shoulder belt) to secure the occupant's upper body to the seat body 1.
It is designed to be fixed to the seat bag 13b of No. 3.

Further, FIGS. 2 to 4 show the installed state of the seat belt retractor 15, and 20 is a seat frame of the seat cushion 13a. This seat frame 20 includes a pair of left and right side pipes 20a, 20b and both side pipes 20.
A connecting pipe 20c connecting the ends of a and 20b.
It is formed into a roughly U-shape. moreover,
This seat frame 20 has both side pipes 20.
A cross pipe 21 is connected between substantially central portions of a and 20b. This cross pipe 21 has approximately U
A letter-shaped support bracket 22 is fixed, and a guide bracket 23 is also fixed.
In this case, the guide bracket 23 is located closer to the backbone 17 than the mounting position of the support bracket 22. Also, the rear end of the seatbelt retractor 15 (the end of the seatbelt webbing 16 opposite to the outlet 15a)
A substantially U-shaped first mounting bracket 24 is provided on the top surface.
is fixed. The first mounting bracket 24 is rotatably connected to the support bracket 22 via a connecting bolt 25, and the seat belt retractor 15 is rotatably supported around the connecting bolt 25.

On the other hand, as shown in FIG. 5, the guide bracket 23 has a pair of left and right bent pieces 2 bent in a substantially L-shape on both sides of the joint 23a with the cross pipe 21.
3b and 23b are formed. Furthermore, as shown in FIG. 6, each bending piece 23b has a guide hole 26 formed in a substantially arc shape. Further, a substantially semicircular insertion hole 27 is formed adjacent to the lower end of the guide hole 26 of each bent piece 23b.
Further, a pair of protrusions 28, 28 are provided protrudingly between the insertion hole 27 and the lower end of the guide hole 26. The insertion hole 27 and the lower end of the guide hole 26 are partitioned by these protrusions 28 , 28 . In addition, the insertion hole 2 of each bent piece 23b
As shown in FIGS. 7 and 8, a shear pin 29 having a substantially semicircular cross-section is inserted through the inside of the shear pin 7. As shown in FIGS. The shear pin 29 is supported by a second mounting bracket 30 having a substantially U-shape fixed to the upper front surface of the seat belt retractor 15. Therefore, the front side of the seat belt retractor 15 is
It is attached to the cross pipe 21 via the mounting bracket 30, shear pin 29 and guide bracket 23, and the seat belt webbing 16
In a normal state in which no particularly large impact force is applied to the shear pin 29, the shear pin 29 is held within the insertion hole 27 of each bent piece 23. In an emergency when a large impact force is applied to the seat belt webbing 16, the end edge 2 of the flat surface 29a of the shear pin 29
9b, 29b shear the protrusions 28, 28 of the guide bracket 23, so that the seatbelt retractor 15 rotates clockwise around the connecting bolt 25 as shown by the arrow in FIG. ing. In this case, seat belt retractor 1
An engaging member 31 attached to the lower end of the backbone 17 in the floor panel 41 of the vehicle body 11 is located at the terminal end of the rotational trajectory of the seatbelt webbing outlet 15a of the seatbelt retractor 15 during the rotational operation in step 5. The engaging portion 31a is extended. The engagement portion 31a of the engagement member 31 has a plurality of concave and convex portions continuously formed in a substantially sawtooth shape, and the engagement portion 31a extends along the front-rear direction of the vehicle body 11. And seat belt webbing 1
In an emergency when a large impact force is applied to 6, the shear pin 2
9, the protrusion 28 of the guide bracket 23,
28 is sheared and the seatbelt retractor 15 rotates around the connecting bolt 25, the engagement protrusion formed on the seatbelt webbing outlet 15a of the seatbelt retractor 15 engages the engagement member 31. The seatbelt retractor 15 is held in a locked state in which rotation is stopped by being fitted into any of the concave and convex portions of the portion 31a.

Therefore, in the case of the above configuration, the seatbelt retractor 15 of the seatbelt device main body 14 is attached to the lower surface of the seat cushion 13a of the seat main body 13, and when the position of the seat main body 13 is adjusted in the longitudinal direction, With the sliding movement, the lower support point position of the seat belt webbing 16 (the position of the belt guide 18) is adjusted to the seat body 13.
Since the seat main body 13 is moved integrally with the seat belt webbing 16, the lower support point position of the seat belt webbing 16 and the seat main body 13 can be adjusted even when the seat main body 13 is slid to any adjustment position in the longitudinal direction of the vehicle body 11.
The distance between the seat bag 13b and the seat bag 13b can always be maintained at a constant distance. Therefore, when adjusting the position of the seat body 13 by sliding the seat body 13 in the front-rear direction, the restraining force of the seat belt webbing 16 on the occupant does not change depending on the sliding position of the seat body 13, as in the conventional case. Since this can be reliably prevented, the distance between the lower support point position of the seat belt webbing 16 and the seat back 13b of the seat body 13 is larger than the appropriate distance, and the seat belt webbing 16 allows the occupant to be held against the seat body 13. When a running vehicle causes a collision due to a weakening of the restraining force fixed to the vehicle, the occupant can be prevented from being pushed forward by inertia and colliding with the steering wheel or the like. Furthermore, unlike in the past, it is not necessary to arrange the guide ring near the operation part of the handbrake or the like, so it is possible to prevent the handbrake or the like from becoming difficult to operate. In addition, the belt guide 18 is arranged approximately in the center of one side of the seat cushion 13a in the longitudinal direction to prevent interference between the seat body 13 and the seat belt webbing 16.
Even when the seat back 13b is tilted forward, the seat belt webbing 16 can be prevented from being caught between the seat back 13b and the seat cushion 13a of the seat body 13, and the front door 12 can be opened as in the conventional case. It is possible to prevent the operating force required for the operation from increasing, and also to prevent the seat belt webbing 16 from loosening and being caught between the front door 12 and the vehicle body 11 when the front door 12 is closed. can be prevented.

Furthermore, when a large impact force acts on the seat belt webbing 16 and the seat belt webbing 16 is strongly pulled upward in FIG.
A rotational force is applied to rotate the connecting bolt 25 at the bottom of the connecting bolt 3a in the clockwise direction as shown by the arrow in FIG. When this rotational force becomes larger than a predetermined set value, the protrusions 28, 28 of the guide bracket 23 are sheared by the shear pin 29. Therefore, in this case, the seat belt retractor 15 rotates clockwise around the connecting bolt 25, and as shown by the imaginary line in FIG.
The rotating end near the engaging portion 31a of the engaging member 31
Therefore, the impact force acting on the seat belt webbing 16 can be transmitted to the floor panel 41 side via the engagement member 31.

Therefore, since there is no need to particularly increase the rigidity of the seat frame 20, cross pipe 21, etc. that support the seat belt retractor 15, an increase in the weight of the seat body 13 can be prevented, and the assembly of the seat body 13 can be simplified. There will be no problem even when

It should be noted that this invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of this invention.

[Effect of idea]

According to this invention, the winding device is attached to the seat cushion, which prevents interference between the seat body and the seatbelt webbing, and provides a stable restraining force for the occupant at all times, regardless of the sliding position of the seat. .

Furthermore, the winding device is pivotally supported at one end under the seat cushion of the seat, and is locked at the other end so as to be able to rotate when a large impact force is applied to the seat belt webbing, and is adjacent to the winding device. Since the engaging member that extends in the longitudinal direction of the vehicle is fixed to the vehicle floor below the seat cushion of the seat, when a large impact force is applied to the seatbelt webbing, the locking part of the retractor is released. ,
By rotating and engaging with the engagement member, the impact force acting on the seat belt webbing can be transmitted to the vehicle body floor via the engagement member.

Therefore, there is no need to increase the rigidity of the seat frame, so there is no increase in the weight of the seat, and no problems occur during assembly.

[Brief explanation of the drawing]

1 to 8 show one embodiment of this invention, and FIG. 1 is a perspective view showing the overall schematic structure;
Fig. 2 is a plan view showing the installed state of the seat belt retractor, Fig. 3 is a side view of the same, Fig. 4 is a front view of the same, Fig. 5 is a front view showing the guide bracket, Fig. 6 is a side view of the same, FIG. 7 is a perspective view showing the shearing pin, FIG. 8 is a side view showing how the shearing pin is attached, and FIG. 9 is a perspective view showing the general structure of a conventional example. 12...Front door, 13...Seat body,
13a... Seat cushion, 13b... Seat bag, 15... Seatbelt retractor (winding device), 16... Seatbelt webbing, 31
...Engagement member, 41...Floor panel (vehicle body floor).

Claims (1)

[Scope of utility model registration request] A retractor for retracting the seatbelt webbing is disposed at approximately the center position in the vehicle width direction in the vehicle interior, and the tip of the seatbelt webbing unwound from the retractor is attached to a fixing member above the door of the vehicle. A seat belt device for a vehicle in which the upper body of an occupant is fixed to a seat back of a seat by a seat belt webbing stretched between a fixing member at an upper portion of the door and a retractor, wherein the retractor is One end of the seat belt webbing is pivotally supported under the seat cushion of the seat, and the other end of the winding device is configured to rotate around the one end side when a large impact force is applied to the seat belt webbing. Attached to the bottom of the seat cushion,
An engaging member is provided that is fixed to the vehicle body floor below the seat cushion of the seat and extends in the longitudinal direction of the vehicle adjacent to the retractor, and when a large impact force acts on the seat belt webbing, the retractor rotates. 1. A vehicle seat belt device, wherein the engaging member and the other end of the retracting device engage with each other to transmit force acting on the seat belt webbing to the vehicle body floor.