JPH07291005A - Seat for automobile - Google Patents

Abstract

PURPOSE:To simplify the structure and reduce the weight though a whiplash injury at the time of a rear-end collision can be surely prevented. CONSTITUTION:Connecting members 8a, 8b which are elongated backward only when load above a designated value is applied thereto are provided on connecting parts among a seat back frame 5 which supports a head rest 3 and cushion members 7a, 7b such as S springs or the like laid on the seat back frame 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat having a headrest.

[0002]

2. Description of the Related Art A headrest is provided above a seat back of a vehicle seat in order to prevent an occupant from whipping when a vehicle is hit later. However, in the conventional type, as shown in FIG. 14, due to the acceleration of the entire seat due to the impact at the time of a rear-end collision and the inertia of the occupant, the seat back a is inclined rearward, and the body of the occupant is lifted obliquely rearward. The head of the occupant shifts upward of the headrest e, a large load acts on the neck, and it is difficult to reliably prevent the whiplash injury of the occupant.

In order to deal with such a problem, the present applicant has applied for a structure shown in FIG. 13 prior to the present application (Japanese Patent Application No. 5-32629).

In this prior art, the load from the occupant applied to the seat back a due to the movement of the upper half of the occupant's body rearward due to the impact when a rear-end collision is applied is received by the impact pressure placed in front of the seat back frame b. The headrest support frame d, which is absorbed by the rearward movement of the frame c and is coupled to the impact pressure receiving frame c, is rotated around the upper side portion b ′ of the seatback frame b along with the rearward movement, and the upper end of the headrest support frame d is The headrest e provided at the front is moved forward. In this way, the headrest e is moved forward during a rear-end collision to approach the occupant's head, and the head is prevented from shifting upward from the headrest e during a rear-end collision, thereby effectively preventing a whiplash injury. .

[0005]

However, according to the above-mentioned prior art, the frame structure of the seat back has a double structure consisting of the seat back frame b and the impact pressure receiving frame c, which causes a problem that the weight becomes heavy. . Further, since the seat back has a double frame structure and the thickness becomes large, there is a drawback that the passenger space in the vehicle compartment is narrowed.

[0006]

In order to solve the above-mentioned problems, the first invention of the present application solves the above-mentioned problems by providing a seatback frame supporting a headrest and an S installed laterally on the seatback frame.
A connecting member such as a spring is provided with a connecting member that extends rearward only when a load of a predetermined value or more is applied.

In order to solve the above problems, the second invention of the present application rotatably supports a headrest support arm on the upper side of the seatback frame and disposes the headrest on the upper end of the headrest support frame, while supporting the headrest. A cushion member such as an S spring is laterally provided below the rotation fulcrum position of the arm, and a load of a predetermined value or more is applied to the connecting portion between the portion below the rotation fulcrum position of the headrest support arm and the seat back frame. It is characterized in that a connecting member extending backward only when loaded is provided.

[0008]

According to the first invention of the present application, the load of the occupant acts on the cushion member such as the S spring in response to the impact when the automobile is rear-end collided, and the connecting members located on both sides of the cushion member are shown in FIG. As shown in FIG. 5, the occupant's head can be reliably received by the headrest, and the occupant's whiplash injury effect can be effectively achieved by extending the occupant's posture almost as it was during a rear-end collision as shown in FIG. Can be prevented.

Further, according to the second invention of the present application, the posture of the occupant can be maintained by the rearward extension of the connecting member at the time of a rear-end collision as in the first invention, and as shown in FIG. The headrest support arm rotates with the rearward extension motion of the vehicle, and the headrest arranged above it moves instantly to approach the occupant's head, so the occupant's head is securely received by the headrest. It is possible to effectively prevent the whiplash injury of the passenger.

According to the first aspect of the invention, the above operation can be performed with a simple structure in which a connecting member is added as compared with the conventional one, and according to the second aspect of the invention, compared with the conventional one. The above operation can be performed with a simple configuration in which a connecting member and a headrest support arm (a structure that is not much different from the conventional headrest support post having a rotatable structure) are added, Compared with the prior art example shown in FIG. 13, the structure can be simplified, the size can be reduced, and the weight can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

FIGS. 1 and 2 show a vehicle seat A, where 1 is a seat cushion, 2 is a seat back, and 3 is a headrest. The seat back 2 is reclinably attached to the seat cushion 1 via an adjusting mechanism 4.

A seat back frame 5 forming a skeleton structure of the seat back 2 is formed by bending a metal pipe into an inverted U shape, and the headrest 3 is provided on an upper side 5a thereof through a pair of support posts 6,6. Is attached. A pair of upper and lower S springs 7a and 7b are laterally provided between the both side portions 5b and 5b of the seat back frame 5 via connecting members 8a and 8b.

As shown in FIGS. 3 and 4, the connecting members 8a and 8b are formed in a compressed shape by folding a steel strip in a zigzag shape, one end of which is the side portion 5b and the other end of which is the S portion. The springs 7a and 7b are fixed to the ends by welding, respectively. The connecting members 8a and 8b are set to have rigidity so as to extend rearward only when a load of a predetermined value or more is applied. Then, as shown in FIG. 4, when the lower connecting member 8b exerts a load larger than a predetermined value on the upper connecting member 8a via the S springs 7a and 7b, the expansion amount thereof is large. Is configured to be.

Next, the operation of the above embodiment will be described.

When the vehicle is rear-end hit, a shocking load is applied to the seat toward the front, and the load of the occupant is applied to the S springs 7a and 7b toward the rear due to the reaction. At this time, a load of a predetermined value or more is applied to the connecting members 8a and 8b located at both ends of the S springs 7a and 7b, so that the connecting members 8a and 8b.
4 extends rearward as shown in FIGS. 4 and 5, and the entire body of the occupant does not tilt backward and moves rearward in a substantially original posture. For this reason, as shown in FIG. 14, the occupant does not float up obliquely rearward due to the impact at the time of a rear-end collision,
The head of the occupant is reliably received by the headrest 3, and the neck of the occupant is protected. Also, the connecting member 8
Since the impact energy is absorbed by the spring action of a and 8b, the impact force acting on the occupant is relaxed.

When the vehicle is hit later, both S springs 7
Since the load acting on a and 7b reaches about 1,000 kgf, it is preferable to set the rigidity such that the connecting members 8a and 8b extend backward only when the load reaches 800 kgf or more. During normal operation, the maximum load acting on both S springs 7a and 7b is 15
Since it is about 0 kgf, the connecting members 8a and 8b maintain their original shapes, and as a result, smooth operation can be maintained. In this embodiment, the lower connecting member 8b is the upper connecting member 8b.
The amount of extension at the time of a rear-end collision is set to be larger than that of a. This is to make it easier to keep the posture of the occupant at the rear-end collision in a more vertical state.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the vehicle seat B according to the second embodiment, the headrest support arm 9 is rotatably supported on the upper side portion 5a of the seatback frame 5, and the upper end portion of the headrest support arm 9 (a pair of post portions). The headrest 3 is provided at 9a. As shown in FIG. 7, the headrest support arm 9 is composed of a pair of left and right bending arms, and the bracket portion 9b provided on the post portion 9a of the headrest support arm 9 is fitted on the upper side portion 5a of the seatback frame 5 to provide a seatback. The frame 5 is rotatably supported. The lower end of the headrest support arm 9 is connected to the end of the upper S spring 7a.

The structure of the second embodiment is common to that of the first embodiment except that the above-mentioned difference and the lower connecting member 8b in the first embodiment are not provided. Cage, seat cushion 1, seat back 2, headrest 3, adjusting mechanism 4, seat back frame 5, upper S spring 7a, lower S spring 7b, upper connecting member 8
The structure and operation of a are similar to those of the first embodiment.

Next, the operation of the second embodiment will be described.

When the vehicle is rear-end hit, a shocking load is applied to the seat toward the front, and the load of the occupant is applied to the S springs 7a and 7b toward the rear due to the reaction. At this time, since a load greater than a predetermined value is applied to the connecting members 8a located at both ends of the upper S spring 7a, the connecting member 8a extends rearward as shown in FIGS. 8 and 9, and the body of the occupant leans backward. Prevent to some extent. Further, as the upper connecting member 8a extends rearward, the headrest support arm 9 rotates about the seat back frame upper side 5a as a rotation fulcrum P as shown by an arrow in FIG. 9, and the headrest supported on the upper end thereof. 3 moves so as to approach the occupant's head. Therefore, the situation in which the occupant floats up obliquely rearward during a rear-end collision is prevented to some extent, and the headrest 3 instantly approaches the occupant's head. Protected. Further, since the impact energy is absorbed by the spring action of the connecting member 8a, the impact force acting on the occupant is alleviated.

In the second embodiment, the connecting member 8a is used.
As the strip, a strip formed by zigzag folding a steel strip into a compressed shape is used. As shown in FIGS. 10 to 12, a pair of links 10a and 10b, a fuse member 10c,
The connecting member 10 including the pair of mounting bolts 10d and 10e is used to disconnect the fuse member 10c when a load of a predetermined value or more is applied.
As a whole, it can be extended backward when a load of a predetermined value or more is applied.

The present invention can be constructed in various modes other than the above-mentioned embodiment, and for example, the connecting member shown in FIGS. 10 to 12 can be adopted as the connecting member in the first embodiment, or In the second embodiment, as in the first embodiment, the connecting members may be arranged at both ends of each of the S springs in multiple stages.

[0025]

According to the present invention, it is possible to prevent the body of an occupant from floating obliquely upward and rearward when a vehicle is hit later, or in addition to this, the headrest is instantly brought close to the occupant's head. As a result, the head of the occupant can be reliably received by the headrest, and as a result, whiplash obstacles can be effectively prevented, and in comparison with the prior art shown in FIG. However, it is possible to achieve the effects that the structure can be simplified, the size can be reduced, and the weight can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway rear view thereof.

FIG. 3 is a perspective view of a main part thereof.

FIG. 4 is a perspective view showing an operation of a main part thereof.

FIG. 5 is a side view showing a state of a seat back at the time of a rear-end collision.

FIG. 6 is a side view showing a second embodiment of the present invention.

FIG. 7 is a partially cutaway rear view thereof.

FIG. 8 is a perspective view showing the operation of the main part, (a)
Shows a normal state and (b) shows a rear-end collision state.

FIG. 9 is a side view showing a state of a seat back at the time of a rear-end collision.

FIG. 10 is a perspective view showing a modification of the connecting member of the second embodiment.

FIG. 11 is a side view showing the normal state.

FIG. 12 is a side view showing the state at the time of the rear-end collision.

FIG. 13 is a side view showing a prior art example filed prior to the present invention, in which (a) shows a normal state and (b) shows a rear-end collision state.

FIG. 14 is a side view showing a collision state of a conventional example.

[Explanation of symbols]

 3 Headrest 5 Seat back frame 7a, 7b Cushion members 8a, 8b, 10 Connecting member 9 Headrest support arm P Rotation fulcrum

Claims (2)

[Claims] 1. A connecting portion for connecting a seat back frame supporting a headrest and a cushion member such as an S spring provided laterally to the seat back frame so as to extend rearward only when a load of a predetermined value or more is applied. A vehicle seat, which is provided with a member. 2. A headrest support arm is rotatably supported on an upper side portion of a seatback frame, and a headrest is disposed on an upper end portion of the headrest support arm, while a headrest support arm is provided on a lower portion of a rotation fulcrum position. S
A connecting member that is provided with a cushion member such as a spring and that extends backward only when a load of a predetermined value or more is applied to the connecting portion between the seatback frame and a portion below the pivotal fulcrum position of the headrest support arm. An automobile seat characterized by being provided with.