JPH10291434A - Car seat frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb energy generated and to effectively damp an impact with a simple structure when a car bumps into the back of the other car. SOLUTION: An emergency frame 19 is rotatably fixed to a seat back frame 12 which is a core material of a car seat back and which is shaped like a letter of inverted U and the lower part of the frame 19 can be oscillated backward. The emergency frame 19 is provided with a head rest 13 at the top end and is joined to the bottom end of back side of the seat back frame 12 at the bottom end. A resin bracket 23 for detaching the bottom end of the emergency frame 19 from the seat back frame 12 is provided and a belt retractor 25 for damping an impact force when the emergency frame 19 is detached is interposed between the bottom end of the emergency frame 19 and the bottom end of the seat back frame 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat frame for an automobile, and more particularly, to reduce the impact at the time of a rear-end collision and reduce the impact at the time of a rear-end collision so that the headrest is positioned close to the head of the occupant. The present invention relates to an automobile seat frame that is automatically moved.

[0002]

2. Description of the Related Art A headrest provided on an automobile seat is generally mounted on an upper portion of a seatback in order to prevent an occupant from whipping due to a rear-end collision. In order to prevent whipping obstacles with this headrest, the headrest that is moderately distant from the occupant's head in normal times should be able to automatically move to the closest position of the head when receiving a rear-end collision is required.

The applicant of the present application has previously proposed a vehicle seat disclosed in Japanese Utility Model Laid-Open No. 7-18442 having such a structure (see FIG. 5). As shown in FIG. 6, the vehicle seat transfers the load from the occupant 2 applied to the seat back 1 to the front of the seat back frame 3 by the movement of the occupant's upper body moving rearward due to the impact at the time of a rear-end collision. Absorption is caused by the rearward movement of the placed emergency frame 4. By the rearward movement of the impact pressure receiving frame 4, the lower end of the headrest support frame 5 connected to the upper end of the impact pressure receiving frame 4 is moved rearward. Since the headrest support frame 5 has an intermediate portion supported by the seat back frame 3 so as to be rotatable in the front-rear direction, the lower end moves rearward to move the upper end to which the headrest 6 is fixed forward. Accordingly, the headrest 6 can be automatically moved to a position close to the head of the occupant 2, and the occupant can be prevented from whipping due to a rear-end collision.

[0004]

In the above-mentioned structure, the headrest 6 is moved forward through the headrest support frame 5 by the backward movement of the impact pressure receiving frame 4 when a collision occurs. ing.
The rearward movement of the impact pressure receiving frame 4 is performed by deforming the low rigidity portion 7 formed by drilling or notching the lower portion of the impact pressure receiving frame 4 at the time of a rear-end collision, so that the impact pressure receiving frame 4 is bent.

However, the low rigidity portion 7 of the impact pressure receiving frame 4
In the deformation of the above, there is a possibility that it becomes insufficient to absorb the large energy generated at the time of the rear-end collision and effectively reduce the impact. Therefore, there is a need to develop a mechanism that can more effectively reduce the impact due to energy absorption at the time of a rear-end collision, and development of such a mechanism has been desired.

Accordingly, the present invention has been developed and proposed to meet the above-mentioned demands, and has as its object to absorb energy generated at the time of a rear-end collision and to effectively mitigate the impact by a simple structure. I do.

[0007]

SUMMARY OF THE INVENTION As a technical means for achieving the above object, the present invention provides an emergency U-shaped seat back frame pivotally attached to an inverted U-shaped seat back frame serving as a core material of an automobile seat back. A lower part can be swung rearward, and a headrest is attached to an upper end of the emergency frame, and a lower end of the emergency frame is connected to a lower end of the rear side of the seat back frame to generate an emergency force from behind. Providing a simple fixing means for allowing the lower end of the frame to be detachable from the seat back frame, and providing a buffer between the lower end of the emergency frame and the lower end of the seat back frame to reduce the impact force when the emergency frame is detached. It is characterized by being interposed.

It is possible to use a belt retractor with a force limiter or a plate curved in a meandering shape as the buffer means.

[0009]

1 to 4 show an embodiment of the present invention.
And will be described.

As shown in FIG. 1, an automobile seat frame includes a seat cushion frame 11 serving as a core material of an automobile seat cushion, and the seat cushion frame 1 as a core material.
The main part is composed of an inverted U-shaped seat back frame 12 attached to the rear end of the vehicle 1 so as to be adjustable in angle and serving as a core material of an automobile seat back, and a headrest 13 attached to an upper portion of the seat back frame 12. Be composed.

More specifically, the above-mentioned seat back frame 12 includes a side frame member 15 whose lower end is attached to the seat cushion frame 11 via a pivot 14.
The upper frame member 16 is integrally fixed to the upper end. The side frame member 15 is formed by bending the front and rear end edges substantially at right angles, while the upper frame member 16 is formed in a pipe shape curved and formed in a U-shape. In the seat back frame 12, the upper end of the side frame member 15 is formed so as to surround and bend the curved end portion of the upper frame member 16, and both overlapping portions are joined and integrated by welding.

The above-mentioned seat back frame 12 has two vertical frame members 17 and a horizontal frame member 18 which is integrally joined to the lower ends of the vertical frame members 17 by welding or the like.
Π-shaped emergency frame 19 composed of
Is pivoted. This emergency frame 19
It is attached to the seat back frame 12 as follows. At the upper end of the vertical frame member 17 of the emergency frame 19, a headrest 13 is mounted via a headrest stay 20.

First, the upper ends of the two vertical frame members 17 are pivotally connected to the upper frame member 16 of the seat back frame 12 by the rotating hinge 21. In this mounting structure, the emergency frame 19 attached by the rotating hinge 21 has the upper end disposed on the front side of the seat back frame 12 and the left and right ends of the horizontal frame member 18 located at the lower end thereof. It is arranged on the back side. In this way, the emergency frame 19 is set so that a portion below the rotating hinge 21 can swing backward.

The horizontal frame member 18 of the emergency frame 19 is located on the back side of the seat back frame 12 as described above, and its length is set so that both ends thereof are in contact with the side frame members 15 of the seat back frame 12. The dimensions are set. Then, the horizontal frame member 18 of the emergency frame 19 is fixed to the lower rear end of the side frame member 15 of the seat back frame 12 by simple fixing means 22.

The simple fixing means 22 connects the horizontal frame member 18 with such strength that the horizontal frame member 18 can be detached from the side frame member 15 of the seat back frame 12 when the emergency frame 19 receives an impact force at the time of a rear-end collision. For example, the horizontal frame member 18 is fastened to the side frame member 15 of the seat back frame 12 by screws 24 using Ω-shaped resin brackets 23 holding both ends of the horizontal frame member 18 of the emergency frame 19. .

Further, the lower end of the vertical frame member 17 of the emergency frame 19 and the seat back frame 12
A buffer means 25 for reducing the impact force at the time of a rear-end collision is interposed between the lower frame member 15 and the lower portion of the side frame member 15. As the buffer means 25, it is preferable to use a belt retractor with a force limiter.

In the belt retractor 25 with a force limiter, a core member (metal shaft) 26 is inserted through a U-shaped retractor frame 28, one of the insertion ends of the core member 26 is fixed to the retractor frame 28, and the other end thereof is fixed. The insertion end is rotatable with respect to the retractor frame 28, and the core 2
The belt 27 is wound around a metal or resin bobbin integrally attached to the belt 6. The retractor frame 28 of the belt retractor 25 is fixed to the side frame member 15 of the seat back frame 12 and the end of the belt 27 is connected to the vertical frame member 17 of the emergency frame 19. The impact force at the time of a rear-end collision is
The energy is absorbed by the torsional deformation of No. 6 and the slight elongation of the belt 27, so that the energy is absorbed.

As another buffer means, a metal plate 25 'curved in a meandering shape as shown in FIG. 2 may be used. The frame member 15 and the vertical frame member 17 of the emergency frame 19 may be joined by welding or the like.

In the automobile seat frame having the above-described structure, a normal space between the head of the occupant 30 sitting on the seat and the headrest 13 does not hinder the free movement of the head as shown in FIG. It is kept at intervals.

On the other hand, at the time of a rear-end collision, as shown in FIG. 4, the screwing of the resin bracket 23, which is the simple fixing means 22, is released by the impact force, so that the emergency frame 19 is fixed to the seat back frame 12. It is released. As a result, the impact force at the time of a collision is applied to the belt retractor 25 with the force limiter, and the belt retractor 25 absorbs the energy at the time of the collision by the torsional deformation of the iron core material 26 and the minute extension of the belt 27. Reduce the impact force.

At this time, the emergency frame 19
The vertical frame member 17 and the horizontal frame member 18 below the pivot hinge 21 swing back around the rotary hinge 21 while the impact force at the time of the rear collision is reduced by the belt retractor 25 with the force limiter. On the contrary, the headrest 13 attached to the upper end of the vertical frame member 17 of the emergency frame 19 and located above the revolving hinge 21 swings forward with the revolving hinge 21 as a center, and is close to the head of the occupant 30. Move to the position and the crew 30
To support the head from behind to avoid whipping obstacles due to rear-end collisions.

Further, in this automobile seat frame,
It is also possible to protect the occupant 30 at the time of a forward collision. That is, the two vertical frame members 1 of the emergency frame 19 are provided inside the seat back frame 12.
Since the 7 is disposed, it is possible to prevent an object flying from behind the seat from colliding with the back of the occupant 30 by the above-described vertical frame member 17 at the time of the rear-end collision.

Note that a conventional automobile seat (FIGS. 5 and 6)
), The headrest 6 is attached by the headrest support frame 5 which is bent and formed in an approximately L-shape, so that the positioning of the headrest 6 is difficult. In this case, the headrest 13 is mounted directly above the emergency frame 19 via the headrest stay 20, so that the position of the headrest 13 is extremely easy.

[0024]

According to the present invention, the emergency frame is pivotally attached to the seat back frame, and the emergency frame can be detached from the seat back frame between the emergency frame and the seat back frame by an impact force from behind. The simple fixing means and the shock absorbing means to reduce the impact force when the emergency frame is detached are provided, respectively, so that the impact can be more effectively reduced by the energy absorption at the time of the collision with a simple structure. In addition, whipping failure can be more reliably prevented, and safety is dramatically improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a seat frame according to the present invention.

FIG. 2 is a partial perspective view showing another example of the buffer means in the seat frame.

FIG. 3 is a cross-sectional view showing a normal state of the seat frame of the present invention.

FIG. 4 is a cross-sectional view illustrating a state of the seat frame of the present invention at the time of a rear-end collision.

FIG. 5 is a side view showing a normal state in a conventional example.

FIG. 6 is a side view showing a state at the time of a rear-end collision in a conventional example.

[Explanation of symbols]

12 Seat back frame 13 Headrest 19 Emergency frame 22 Simple fixing means 25 Buffer means (belt retractor with force limiter)

Claims (3)

[Claims] 1. An emergency frame is pivotally mounted on an inverted U-shaped seat back frame serving as a core material of an automobile seat back so that a lower portion thereof can swing backward, and a headrest is mounted on an upper end portion of the emergency frame. And a simple fixing means for connecting the lower end of the emergency frame to the lower rear end of the seat back frame so that the lower end of the emergency frame can be detached from the seat back frame by an impact force from behind, A seat frame for an automobile, wherein a buffer means for reducing the impact force when the emergency frame is detached is interposed between a lower end portion of the emergency frame and a lower end portion of the seat back frame. 2. The vehicle seat frame according to claim 1, wherein said buffer means is a belt retractor with a force limiter. 3. The automobile seat frame according to claim 1, wherein said buffer means is a plate curved and formed in a meandering shape.