JP3928242B2 - Vehicle seat belt device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat belt device for a vehicle.
[0002]
[Prior art]
Many of the vehicle seat belt devices are so-called three-point seat belts. That is, the web (belt) pulled out from the retractor as the first fixed portion is passed through an anchor (guide) disposed near the shoulder portion of the occupant seated on the seat, and the leading end of the web is moved to the occupant's shoulder. While fixing to the 2nd fixing | fixed part of the left right side one side, the web between this anchor and the 2nd fixing | fixed part is detachably fixed to the 3rd fixing | fixed part of the other side of a passenger | crew's right and left side. ing. In such a three-point seat belt, the lower part of the occupant's body is restrained across the vehicle width direction, and can be restrained obliquely in a pave-like shape from the shoulder to the lower part of the body, and thus has sufficient restraint.
[0003]
Passengers sitting in the left and right parts of the driver's seat, front passenger seat, and rear seat are located near either one of the left and right sides with a rigid body strength member such as a pillar. It becomes possible to fully satisfy the point of fixation. On the other hand, for an occupant seated in the central part of the rear seat, for example, a vehicle body strength member with excellent rigidity is not positioned near the left and right, so selection of the fixing position of the retractor is a big problem. Japanese Patent Application Laid-Open No. 8-169301 discloses a device for fixing a retractor to a seat back.
[0004]
[Problems to be solved by the invention]
As described in the above publication, when the retractor is provided on the seat back, the seat back is normally connected to the seat cushion so that it can swing in the front-rear direction, that is, reclining, so that the occupant can be prevented during a frontal collision. A large restraining force is concentrated and applied to the swing fulcrum of the reclining mechanism (the amount of connection between the seat cushion and the seat back).
[0005]
The present invention has been made in consideration of the above-described circumstances. The purpose of the present invention is to restrict the occupant with a three-point seat belt even when there is no vehicle body strength member near the occupant. An object of the present invention is to provide a vehicle seat belt device in which the arrangement position is devised so that a large restraining force at the time of a frontal collision does not adversely affect the seat.
[Means for Solving the Problems]
In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1 in the claims,
The web pulled out from the retractor as the first fixing portion is passed through an anchor disposed in the vicinity of the shoulder of the occupant seated on the seat, and the leading end of the web is connected to the second on the left and right side of the occupant. In the vehicle seat belt device, the web between the anchor and the second fixing portion is detachably fixed to the third fixing portion on the other side of the left and right side of the occupant while being fixed to the fixing portion.
The seat comprises a seat cushion having a seat cushion frame extending in the longitudinal direction of the vehicle body and a cushion portion supported on the seat cushion frame, and a seat back disposed on the rear end side of the seat cushion,
The front end portion of the seat cushion frame is inclined so as to be higher than the middle portion in the front-rear direction of the seat cushion frame on the rear side of the front end portion of the seat cushion frame,
The seat cushion portion is thinner in the region of the front end portion of the seat cushion frame than the region of the middle portion in the front-rear direction of the seat cushion frame with respect to the thickness in the vertical direction,
The seat comprises a rear seat,
The floor panel below the seat cushion is provided with a bulging portion that bulges upward from the occupant's foot height in the lower region of the front end portion of the seat cushion frame,
The front end portion of the seat cushion frame is bent in the upper region of the bulging portion, and a protrusion that is the highest position among the front end portions of the seat cushion frame is formed at the front end portion of the seat cushion frame. ,
The retractor is arranged on the lower surface side of the protrusion . A preferred mode based on the above solution is as described in claim 2 and the following claims.
[0006]
【The invention's effect】
According to the first aspect, since the large restraining force applied to the web at the time of a frontal collision is distributed and received in addition to the connecting portion between the seat back and the seat cushion, it does not cause an excessively large force to act on the seat. This is preferable in terms of points. In addition, the retractor is disposed at a position where it cannot be seen in the normal use state of the seat, such as below the seat cushion, which is preferable from the viewpoint of appearance.
Further, the front end portion of the seat cushion frame is inclined so as to be higher than the middle portion in the front-rear direction of the seat cushion frame on the rear side of the front end portion of the seat cushion frame, and the seat cushion portion is related to the vertical thickness thereof. The submarine phenomenon of the occupant at the time of a forward collision (a phenomenon in which the body slides down at the beginning of the collision) because the area at the front end of the seat cushion frame is thinner than the area at the middle in the front-rear direction of the seat cushion frame It is preferable for preventing the above.
[0007]
According to claim 2, even if the seat is a seat portion in the center in the vehicle width direction in which three seats are seated in the vehicle width direction in which the vehicle body strength member having excellent rigidity is not located near the left and right, Therefore, it is preferable in that it does not apply an excessive force.
[0008]
According to the third aspect of the present invention, the seatback is set to the swinging fulcrum for swinging the seat back to the lying position while effectively using the seat back as the lying position and making the back position as the storage surface. It is possible to prevent a situation in which the binding force acts.
[0009]
According to the fourth aspect , the anchor and the retractor can be arranged in relation to the sheet, and there is no need to particularly consider the arrangement relationship with other members other than the sheet .
[0010]
According to claim 5 , the web is pulled out from behind the occupant and used, and the direction in which the web is pulled out from the retractor is directed toward the occupant's back direction. It will be a thing.
[0011]
According to the sixth aspect , it is possible to increase the thickness of the seat cushion in the center portion in the vehicle width direction of the occupant seating position as much as possible without being obstructed by the retractor, which is preferable for improving the ride comfort. .
[0012]
According to the seventh aspect , the retractor can be incorporated in the sheet in advance as an accessory of the sheet. Further, the retractor can be firmly fixed to a member excellent in strength such as a frame of a seat cushion.
[0013]
According to the eighth aspect of the present invention, the retractor can be firmly fixed to a member excellent in strength such as a floor panel.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In FIGS. 1 and 2, reference numeral 1 denotes a seat, which is a rear seat disposed behind the front row seat constituting the driver seat and the passenger seat. The seat 1 includes a seat cushion 2, a seat back 3, and a headrest 4 that is detachably attached to the seat back 3. The frame 2a of the seat cushion 2 is attached to the floor panel 5 via a bracket (not shown). However, the seat cushion 2 may be attached in a manner that allows sliding in the front-rear direction or in a manner that does not allow sliding in the front-rear direction.
[0015]
The seat back 3 can swing with respect to the seat cushion 2 in the front-rear direction about the swing fulcrum 6 (reclining mechanism). The seat back 3 can be largely swung back and forth, and can take a forward lying position where the seat back 3 is tilted forward and superposed on the seat cushion 2 in a substantially horizontal state. The back surface of the seat back 3 is a substantially flat surface, and the back surface of the seat back 3 constitutes a substantially horizontal storage surface when set to the forward lying position. Further, the seat back 3 is greatly swung rearward so that a substantially horizontal backward lying position can be taken, and the seat cushion 2 and the seat back 3 are substantially flush with each other at the backward lying position. A large flat surface is constructed.
[0016]
The seat 1 has three seats in the vehicle width direction, and the seat belt device according to the present invention is applied to the occupant F seated at the center thereof. The seat belt device is a so-called three-point system. First, a retractor 11 as a first fixing portion is fixed to a front end portion of the lower surface of the frame 2a of the seat cushion 2 by a fixing tool such as a bolt. Near the left and right sides of the occupant F, a pair of left and right second fixing portions 12 and a third fixing portion 13 are fixed to the frame 2 a of the seat cushion 2. And the anchor 14 which has the ring part 14a is being fixed to the side of the upper end part of the seat back 3 near the side of the headrest 4 for center seats. The anchor 14 is fixed by screwing a mounting screw portion 14 b extending downward to the frame of the seat back 3.
[0017]
From the retractor 11, the web 15 is pulled out rearward. After reaching the rear end of the seat cushion 2, the web 15 extends upward behind the seat back 3 along the back surface of the seat back 3, and is inserted into the ring portion 14 a of the anchor 14. The tip of the web 15 that has passed through the anchor 14 is always fixed to the second fixing portion 12.
[0018]
A buckle receiving member 17 as a first engaging member is always fixed to the third fixing portion 13 via a short connecting wire 16 or the like. The web 15 between the anchor 14 and the second fixing portion 12 is inserted into a ring portion 18a of a buckle 18 as a second engagement member. The engagement protrusion 18 b of the buckle 18 is engaged with (removed from or inserted into) the buckle receiving member 17. The buckle receiving member 17 has a built-in lock mechanism, and is automatically locked when the buckle 18 is engaged so that the buckle 17 is not removed. By operating a lock operating member 17 a provided on the buckle receiving member 17, the lock is released and the buckle 18 can be pulled out from the buckle receiving member 17.
[0019]
Here, it demonstrates in detail regarding the retractor 11. FIG. First, the frame 2a of the seat cushion 2 has the lowest middle portion in the front-rear direction, and is shaped so that the butt of the occupant F can sufficiently sink (the seat cushion 2 corresponding to the middle portion in the front-rear direction). The cushion part is thickest). Each of the front end portion and the rear end portion of the seat cushion 2 is higher than the middle portion in the front-rear direction, and the cushion of this portion is thinned.
[0020]
The retractor 11 is fixed to the lower surface of the frame 2a, and the position of the retractor 11 is set at a position sufficiently higher than the lowest position near the front end of the frame 2a. The web 15 pulled out from the retractor 11 extends rearward while maintaining a vehicle width direction position substantially the same as the position of the retractor 11 in the vehicle width direction, and reaches the rear end of the seat cushion 2. On the lower surface of the frame 2a, a guide roller 21 for holding the web 15 smoothly by preventing the web 15 from interfering with the frame 2a and the like is held.
[0021]
The web 15 extends upward along the back surface of the seat back 3 from the rear end of the seat cushion 2, that is, the lower end of the seat back 3, while maintaining substantially the same vehicle width direction position as the retractor 11 in the vehicle width direction. The anchor 14 is positioned exactly at the position extending upward. That is, the position in the vehicle width direction of the retractor 11 and the position in the vehicle width direction of the anchor 14 are substantially matched, and an unreasonable bending force or the like in the vehicle width direction between the web 15 and the anchor 14 is reached. Has been made to not work. In the embodiment, as is clear from FIG. 2, the retractor 11 and the anchor 14 are slightly offset in the vehicle width direction with respect to the occupant F (the middle position in the vehicle width direction of the central seat on which the occupant is seated). The position is set (offset to be located near the shoulder of the occupant F in the vehicle width direction).
[0022]
At the time of a frontal collision, the restraining force to the occupant F by the web 15 is supported by the three fixing portions 11 to 13. This restraining force acts as a force for swinging the seat back 3 forward, but is also received by the retractor 11, that is, the frame 2 a of the seat cushion 2. Large force is prevented from acting.
[0023]
In FIG. 1, a retractor can also be arrange | positioned in the front-back direction substantially intermediate part of the seat cushion 2, and the retractor arrange | positioned in such a position is distinguished and shown with the code | symbol 11B. Moreover, a retractor can also be arrange | positioned at the rear-end part of the seat cushion 2, and the retractor arrange | positioned in such a position is shown with the code | symbol 11C. The retractor 11B is fixed to the floor panel 5 and the retractor 11C is fixed to the frame 2a. However, if the retractor 11B is below the seat cushion 2, the retractor 11B is fixed to the frame 2a or the floor panel 5 It can be arbitrarily selected whether to fix to.
[0024]
Although the embodiments have been described above, the object of the present invention is not limited to those explicitly described, but also implicitly includes providing what is substantially preferred or expressed as an advantage.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view illustrating an embodiment of the present invention.
FIG. 2 is a front view of FIG.
[Explanation of symbols]
1: Seat 2: Seat cushion 3: Seat back 5: Floor panel 6: Swing fulcrum of seat back 11: Retractor (first fixed part)
12: Second fixing portion 13: Third fixing portion 14: Anchor 15: Web 17: Buckle receiving member 18: Buckle

Claims (8)

The web pulled out from the retractor as the first fixing portion is passed through an anchor disposed in the vicinity of the shoulder of the occupant seated on the seat, and the leading end of the web is connected to the second on the left and right side of the occupant. In the vehicle seat belt device, the web between the anchor and the second fixing portion is detachably fixed to the third fixing portion on the other side of the left and right side of the occupant while being fixed to the fixing portion.
The seat comprises a seat cushion having a seat cushion frame extending in the longitudinal direction of the vehicle body and a cushion portion supported on the seat cushion frame, and a seat back disposed on the rear end side of the seat cushion,
The front end portion of the seat cushion frame is inclined so as to be higher than the middle portion in the front-rear direction of the seat cushion frame on the rear side of the front end portion of the seat cushion frame,
The seat cushion portion is thinner in the region of the front end portion of the seat cushion frame than the region of the middle portion in the front-rear direction of the seat cushion frame with respect to the thickness in the vertical direction,
The seat comprises a rear seat,
The floor panel below the seat cushion is provided with a bulging portion that bulges upward from the occupant's foot height in the lower region of the front end portion of the seat cushion frame,
The front end portion of the seat cushion frame is bent in the upper region of the bulging portion, and a protrusion that is the highest position among the front end portions of the seat cushion frame is formed at the front end portion of the seat cushion frame. ,
The retractor is disposed on the lower surface side of the protrusion,
A vehicle seat belt device. In claim 1,
The seat is a seat portion in the center in the vehicle width direction in which three people are seated in the vehicle width direction.
A vehicle seat belt device. In claim 1 or 2,
The seat back is adapted to be able to take a lying position where it is tilted forward and polymerized in a substantially horizontal state on the seat cushion,
The back surface of the seat back in the lying position is configured as a substantially flat surface to be a storage surface,
A vehicle seat belt device. In any one of Claims 1-3,
The anchor is fixed to the upper end of the seat back;
The web pulled out from the retractor extends upward along the back of the seat back from the rear end of the seat cushion, and is arranged to pass through the anchor.
A vehicle seat belt device. In any one of Claims 1-4,
The web is pulled backward from the retractor;
A vehicle seat belt device. In any one of Claims 1-5,
The retractor is disposed offset in the vehicle width direction with respect to an occupant seated on the seat cushion,
The anchor is also offset in the vehicle width direction with respect to the occupant seated on the seat cushion so as to be in the same position in the vehicle width direction as the retractor.
A vehicle seat belt device. In any one of Claims 1-6,
The retractor is fixed to a lower surface of a seat cushion frame of the seat cushion;
A vehicle seat belt device. In any one of Claims 1-6 ,
The retractor is fixed to a floor panel below the seat cushion,
A vehicle seat belt device.

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