JP2010254109A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently reduce the flexural deformation of a lower panel toward a rear side by suppressing the expansion deformation of a rear panel part and a side panel part which are included in each of right and left side frames of a seat back frame. <P>SOLUTION: The seat back frame 21 includes both the right and left side frames 30, an upper frame 22 mounted across the upper end parts of both the side frames 30, and a lower panel 23 mounted across the lower parts of both the side frames 30. An operation mechanism 70 with a pressed member 80 is mounted to the lower panel 23. Each of both the side frames 30 includes a rear panel part 31, and a side panel part 32 bent at a predetermined angle toward a front side from the side edge part of the rear panel part 31. A reinforcement body 33 for suppressing the expansion deformation of both the panel parts 31 and 32 to reduce the flexural deformation of the lower panel 23 toward the rear side is arranged between the rear panel part 31 and the side panel part 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle seat having an active headrest mounted on an upper portion of a seat back.

2. Description of the Related Art Conventionally, as disclosed in, for example, Patent Document 1, in a vehicle seat mounted with an active headrest mounted on the upper portion of a seat back, an operation mechanism (lock release mechanism) having a pressure receiving member inside the seat back. ), And a structure in which the support portion of the active headrest is projected toward the back of the seated person by an operating mechanism when a backrest load at the time of rear impact acts on the pressure receiving member is known.
In this type of vehicle seat, for example, as shown in FIG. 11, the front of a lower panel 123 in which an operating mechanism 170 having a pressure receiving member 180 is mounted across the lower portions of the left and right side frames 130 of the seat back frame 121. There is a structure that is attached to the side.

JP 2008-6911 A

By the way, in the vehicle seat shown in FIG. 11, when the backrest load at the time of the rear impact is applied to the pressure receiving portion 181 of the pressure receiving member 180, the lower panel 123 that supports the operating mechanism 170 by the backrest load is rearward. May bend toward
That is, the lower panel 123 faces rearward while the rear panel 131 and the side panel 132 constituting the left and right side frames 130 of the seat back frame 121 are expanded and deformed as shown by the two-dot chain line in FIG. May be bent.
In this case, it is assumed that the operation timing of the operation mechanism 170 is delayed due to the bending of the lower panel 123, thereby delaying the protrusion timing of the support portion of the active headrest.
In order to reduce the bending of the lower panel 123, it is possible to increase the rigidity by increasing the thickness of the left and right side frames 130 and the lower panel 123. In this case, however, the weight increases.

  In view of the above problems, an object of the present invention is to prevent the rear panel portion and the side panel portion constituting the left and right side frames of the seat back frame from expanding and deforming to the rear of the lower panel. It is an object of the present invention to provide a vehicle seat that can efficiently reduce bending deformation.

In order to solve the above-mentioned problems, a vehicle seat according to a first aspect of the present invention is provided with an active headrest attached to an upper portion of a seatback, an operating mechanism having a pressure receiving member inside the seatback, and a rear impact. A vehicle seat configured to project a support portion of the active headrest toward the back of the seated person by the operating mechanism when a backrest load at the time acts on the pressure receiving member;
The seat back frame of the seat back includes left and right side frames, an upper frame mounted over the upper ends of the side frames, and a lower panel mounted over the lower portions of the side frames,
An operating mechanism having the pressure receiving member is mounted on the lower panel,
The both side frames have a rear panel part and a side panel part bent forward from the side edge part of the rear panel part at a predetermined angle,
A reinforcing body is provided between the rear panel portion and the side panel portion, which suppresses the expanding deformation of both the panel portions and reduces the backward deformation of the lower panel. .

According to the above configuration, the expansion deformation of both the panel portions can be satisfactorily suppressed by the reinforcing body provided between the rear panel portion and the side panel portion constituting the left and right side frames of the seat back frame. it can. For this reason, it is possible to efficiently reduce the rearward deformation of the lower panel while suppressing an increase in weight corresponding to the weight of the reinforcing body.
As a result, when the backrest load at the time of the rear impact is applied to the pressure receiving member, the operating mechanism can be operated without operating delay, and the delay of the protrusion timing of the support portion of the active headrest can be prevented.

The vehicle seat according to claim 2 is the vehicle seat according to claim 1,
The reinforcing body includes a reinforcing rib mounted between the rear panel portion and the side panel portion,
It is comprised by at least one of the reinforcement beads formed in the corner | angular part of the said rear panel part and the said side panel part, It is characterized by the above-mentioned.

According to the above configuration, when the reinforcing body is constituted by the reinforcing ribs, it is very easy to attach the reinforcing ribs between the rear panel portion and the side panel portions constituting the left and right side frames of the seat back frame. Can be configured.
In addition, when the reinforcing body is constituted by reinforcing beads (triangular beads, diamond beads, etc.), the rear panel portion, the side panel portion, and the corner portion constituting the left and right side frames of the seat back frame are recessed. It can be easily constructed and does not increase in weight.

A vehicle seat according to claim 3 is the vehicle seat according to claim 1 or 2,
The reinforcing panel is mounted between the left and right side frames and superimposed on the lower panel.

  According to the said structure, the bending deformation to the back of a lower panel can be further reduced with a reinforcement panel.

It is a perspective view which shows the vehicle seat which concerns on Example 1 of this invention. It is a perspective view which similarly shows the frame | skeleton of a vehicle seat. It is a perspective view which similarly shows the action | operation mechanism of an active headrest. It is a side view which similarly shows the action | operation mechanism of an active headrest. It is a front view which similarly shows the action | operation mechanism of an active headrest. It is a perspective view which similarly shows a seat back frame from the back side. FIG. 7 is a plan sectional view of the seat back frame based on the VII-VII line in FIG. 6. It is sectional drawing which similarly shows the relationship between the side frame of a seat back frame, a lower panel, a reclining upper arm, a reinforcement rib, and a reinforcement panel. It is explanatory drawing which shows the embodiment by which the reinforcement bead was formed in the corner | angular part of the rear panel part and side panel part of a side frame. It is explanatory drawing which shows the embodiment by which the folding | turning part was formed in the side edge part of a reinforcement panel. It is explanatory drawing which shows the reference example by which the side frame of a seat back frame is not reinforced.

  The best mode for carrying out the present invention will be described in accordance with an embodiment.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle seat 1 includes a seat cushion 10, a seat back 20, and an active headrest 50.
As shown in FIGS. 1 and 2, the seat cushion 10 has a reclining lower arm 12 fixed to the left and right sides of the rear portion of the cushion frame (not shown) by fixing means such as bolts or welding.
On the other hand, a reclining upper arm 24 is fixed to lower portions of the left and right side frames 30 of a seat back frame 21 (described later) provided in the seat back 20.
The seat back 20 is attached to the seat cushion 10 so that the angle can be adjusted between a standing position and a desired tilt position by a reclining mechanism 40 disposed between the reclining lower arm 12 and the reclining upper arm 24.

  As shown in FIGS. 2 and 6, the seat back frame 21 provided in the seat back 20 has left and right side frames 30 that are L-shaped (or U-shaped) with a predetermined interval in the left-right direction. And an upper frame 22 made of an inverted U-shaped metal pipe material that spans between the upper ends of the side frames 30 and integrally connects the side frames 30, and is fixed to the lower portions of the side frames 30, respectively. The left and right reclining upper arms 24 projecting downward, and the lower panel 23 straddling between the lower portions of the side frames 30 and integrally connecting the side frames 30 are formed.

  As shown in FIG. 2, a pair of left and right support holders 41 are attached to the upper frame 22, and supports 42 are fitted into both the support holders 41, respectively. The pair of left and right stays 52 of the active headrest 50 are inserted and locked to the both supports 42 so as to be height-adjustable, so that the active headrest 50 is mounted on the upper portion of the seat back 20.

Inside the active headrest 50, a base part 51, a pair of left and right stays 52 integrally attached to the base part 51, and a base mechanism 51 are assembled via a link mechanism (not shown), and are always attached by a spring. A support plate 53 (corresponding to the support portion of the present invention) urged in the protruding direction and a lock mechanism 57 that locks the support plate 53 in a normal support position against the urging force of the spring are arranged. Yes.
When the lock mechanism 57 is unlocked, the link mechanism is actuated by the biasing force of the spring, so that the support plate 53 is instantaneously projected to the projecting position for supporting the seated person's rear head. It is like that.

An unlock member 58 for unlocking the lock mechanism 57 is disposed at the unlock position at one of the supports 42, in the upper portion of the support 42 on the right side in FIG. It is inserted so that it can be pushed up.
Further, one end of the interlock cable 60 (upper end in FIG. 2) that can push up the unlocking member 58 to the unlocking position is inserted and locked to the one support 42.
In the first embodiment, the interlocking cable 60 includes an outer cable 61 and an inner cable 65 that is movably inserted through the outer cable 61.

  Also, one end portion (the upper end portion in FIG. 2) of the outer cable 61 is movably inserted into one support 42, and the other end portion (the lower end portion in FIG. 2) of the outer cable 61 is It is locked to the cable fixing piece 79 of the base plate 71 of the operating mechanism 70 to be described. Further, one end portion (the upper end portion in FIG. 2) of the inner cable 65 is locked inside one support 42, and the other end portion (the lower end portion in FIG. 2) of the inner cable 65 is the first described below. 2 is connected to the operating member 96 (see FIG. 3).

As shown in FIG. 2, an operating mechanism 70 having a pressure receiving member 80 is mounted inside the seat back 20.
In the first embodiment, an operating mechanism 70 is mounted on the front surface of the lower panel 23 of the seat back frame 21. When the backrest load at the time of rear impact acts on the pressure receiving member 80, the inner cable 65 is pulled by the operating mechanism 70, whereby the unlocking member 58 is pushed up to the unlocking position, and the locking mechanism 57 of the active headrest 50 is reached. Is unlocked, and the support plate 53 of the active headrest 50 is projected toward the back of the seated person.

As shown in FIGS. 3 to 5, the operation mechanism 70 includes a base plate 71, a pressure receiving member 80, an operation arm 85, a first operation member 90, and a second operation member 96.
The base plate 71 is formed by pressing a metal plate, and is fixed to the front surface of the lower panel 23 with bolts or the like.
A pair of left and right mounting pieces 72 corresponding to the pressure receiving member 80 are formed to be bent forward at the upper portion of the base plate 71, and a guide piece 73 corresponding to the operating arm 85 is forwardly provided at the left edge as viewed in FIG. It is bent and formed.
The guide piece 73 is formed with a long hole-shaped guide hole 74 for moving and guiding the operation pin 89 of the operation arm 85. The long hole 74 has a front guide surface 75 having a gently curved surface, and a rear guide surface. 76 is formed.
Further, as shown in FIG. 4, the rear guide surface 76 is formed in a stepped shape including an upper guide surface 76a and a lower guide surface 76b retreated to the rear side with a step surface at the lower end of the upper guide surface 76a. Has been.
Further, as shown in FIG. 5, a corresponding stopper piece 78 of the first actuating member 90 is formed in the vicinity of the center portion of the base plate 71 by bending.
Further, a cable fixing piece 79 to which the other end 63 of the outer cable 61 of the interlocking cable 60 is fixed is formed at the upper right side of the base plate 71 in FIG.

As shown in FIGS. 3 and 4, the pressure receiving member 80 has a base portion (rear portion) attached between a pair of left and right mounting pieces 72 of the base plate 71 so as to be rotatable about a horizontal shaft 82, and a spring 83. Is biased upward (in the direction of arrow A in the figure).
The pressure receiving member 80 is formed with a pressure receiving portion 81 extending forward from the base, and the pressure receiving portion 81 is in contact with the rear surface of the pad member 25 of the seat back 20 as shown in FIG. The person's backrest load is received.
Further, a connecting piece 84 corresponding to the operating arm 85 is formed in the vicinity of the pressure receiving portion 81 of the pressure receiving member 80 by bending.

As shown in FIGS. 3 to 5, the operating arm 85 transmits only the backrest load from the occupant during the rear-end collision of the vehicle to the first operating member 90 described below. Is formed.
One end of the operating arm 85 is attached to the connecting piece 84 of the pressure receiving member 80 so as to be rotatable about a horizontal axis 86.
A lateral operation pin 89 protrudes (fixes) on the side surface of the operation arm 85 in the vicinity of the bent portion of the cross-section. The operation pin 89 is movably inserted along the guide hole 74 of the base plate 71. Further, a weight 88 is attached to the distal end portion of the operating arm 85.
Further, the operating arm 85 is urged by a spring 87 downward (in the direction of arrow B in FIG. 4) where the operating pin 89 contacts the front guide surface 75 of the guide hole 74.
Further, when the operation pin 89 is moved from the upper guide surface 76a of the rear guide surface 76 of the elongated hole 74 to the lower guide surface 76b at the time of a rear collision, the operation pin 89 is engaged with the first operation member 90 described below. It can be operated by engaging the joint portion 93.

As shown in FIGS. 3 to 5, the first actuating member 90 transmits the movement of the actuating arm 85 to the second actuating member 96 described below. It is attached so as to be rotatable about an axis 91 in a direction orthogonal to 71. A contact piece 93 extending to a position where the first actuating member 90 can come into contact with the stopper piece 78 of the base plate 71 is formed on the upper one side (right side in FIG. 5). On the left side, an engaging piece 94 extending to a position where it can come into contact with the operating pin 89 is formed, and a second operating member 96 described below is engaged in a non-operating state in an upper central portion. A locking portion 95 that stops is formed.
The first actuating member 90 is biased by the spring 92 in the direction in which the abutting piece 93 abuts against the stopper piece 78 (the direction of arrow C in FIG. 5).

As shown in FIG. 5, the second operating member 96 pulls the inner cable 65 of the interlocking cable 60 by being rotated in conjunction with the operation of the first operating member 90. The shaft 97 is attached so as to be rotatable about a shaft 97 in a direction orthogonal to the base plate 71.
The second actuating member 96 is engaged with the cable connecting piece 100 to which the cable end 68 attached to the other end 67 of the inner cable 65 of the interlocking cable 60 is connected, and the locking portion 95 of the first actuating member 90. An engaging portion 99 is formed that is detachably engaged and held in an inoperative state.
The second actuating member 96 is urged by a spring 98 in the direction in which the engaging portion 99 engages with the locking portion 95 of the first actuating member 90 (the direction of arrow D in FIG. 5).

The operation mechanism 70 configured as described above operates as follows.
First, from the state shown in FIG. 4, when a backrest load by a normal seated person acts on the pressure receiving member 80 with respect to the seat back 20 and the pressure receiving member 80 rotates against the urging force of the spring 83, the operating arm The operating pin 89 rotates about the shaft 82 against the urging force of the spring 87 while being guided to move downward along the front guide surface 75 of the guide hole 74.
For this reason, in the backrest load by a normal seated person, the 1st operation member 90 is not operated.

At the time of the rear impact of the vehicle, if the backrest load of the seated person at the time of the subsequent impact acts on the pressure receiving member 80, an inertial force acts on the weight 88 of the actuating arm 85 toward the rear. The pin 89 rotates about the shaft 82 against the urging force of the spring 87 while being guided to move downward along the rear guide surface 76 of the guide hole 74.
The first operating member 90 resists the urging force of the spring 92 by pushing down the engaging piece 94 of the first operating member 90 while the operating pin 89 is moved along the lower guide surface 76 b of the rear guide surface 76. Then, the shaft 91 is turned around.
As the first actuating member 90 rotates, the turning force is transmitted to the second actuating member 96 via the locking part 95 and the engaging part 99, and the second actuating member 96 receives the biasing force of the spring 98. Against this, it rotates around the shaft 97.
As a result, the inner cable 65 of the interlocking cable 60 is pulled, and the unlocking member 58 is pushed upward by the pulling, and the lock mechanism 57 of the active headrest 50 is unlocked.
Then, the support plate 53 of the active headrest 50 protrudes toward the back of the seated person.

In the vehicle seat according to the first embodiment, when the backrest load at the time of the rear impact is applied to the pressure receiving member 80, the lower panel 23 of the seat back frame 21 is moved backward via the operation mechanism 70 by the backrest load. In order to reduce bending toward the rear, a reinforcing body 33 is provided between the rear panel portion 31 and the side panel portion 32 constituting the left and right side frames 30 of the seat back frame 21. Yes.
In the first embodiment, as shown in FIGS. 6 to 8, the reinforcing body 33 is composed of one or a plurality of substantially triangular reinforcing members mounted between the rear panel portion 31 and the side panel portion 32 of the side frame 30. The rib 34 is configured.
Further, as shown in FIG. 2, it is desirable to dispose the reinforcing rib 34 near the height level of the side frame 30 corresponding to the height of the shaft 82 that forms the rotation center of the pressure receiving member 80. Furthermore, it is desirable to arrange reinforcing ribs 34 at a plurality of upper and lower locations (two locations in FIG. 2) near the height level.

Further, in the first embodiment, as shown in FIGS. 6 and 7, the seat back frame 21 is straddled between the rear side surfaces of the rear panel portions 31 of the left and right side frames 30 and on the rear side surface of the lower panel 23. The reinforcing panel 36 is integrally attached by welding or the like in the overlapped state.
Further, as shown in FIG. 7, the left and right end portions of the reinforcing panel 36 are extended from the rear side surfaces of the rear panel portions 31 of the left and right side frames 30 along the side panel portions 32 to form folded portions 37. It is desirable that the folded portion 37 is integrally fixed to the outer surface of the side panel portion 32 by welding or the like to increase the rigidity of the portion.
As shown in FIG. 10, even if the left and right end edges of the reinforcing panel 36 are formed within the range of the rear side surfaces of the rear panel portions 31 of the left and right side frames 30, it is effective to prevent the lower panel 23 from being bent backward. is there.

The vehicle seat according to the first embodiment is configured as described above.
Accordingly, the reinforcing ribs 34 as the reinforcing bodies 33 provided between the rear panel portion 31 and the side panel portions 32 constituting the left and right side frames 30 of the seat back frame 21 are used to form the two panel portions 31, 32. Spreading deformation can be satisfactorily suppressed.
For this reason, it is possible to efficiently reduce the rearward deformation of the lower panel 23 while suppressing an increase in weight corresponding to the weight of the reinforcing rib 34.
As a result, when the backrest load at the time of the rear impact acts on the pressure receiving member 80, the pressure receiving member 80, the operating arm 85, the first operating member 90, and the second operating member 96 can be operated without operating delay. As a result, it is possible to prevent a delay in the projecting time of the support plate 53 as a support portion of the active headrest 50, and it is possible to favorably support the back head of the seated person.

Further, in the first embodiment, the reinforcing rib 34 is mounted between the rear panel portion 31 and the side panel portion 32 constituting the left and right side frames 30 of the seat back frame 21 with an extremely simple structure. The reinforcing body 33 can be configured easily.
Further, in the first embodiment, the rear of the lower panel 23 is provided by the reinforcing panel 36 that is mounted between the rear side surfaces of the left and right side frames 30 of the seat back frame 21 and superimposed on the rear side surface of the lower panel 23. Can be further reduced.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can also be implemented with a various form.
For example, in the first embodiment, the rear panel portion 31 and the side panel portion 32 constituting the left and right side frames 30 of the seat back frame 21 and the reinforcing rib 34 as the reinforcing body 33 for suppressing the expansion deformation. However, as shown in FIG. 9, reinforcements such as triangular beads and diamond beads are provided at the corners of the rear panel portion 31 and the side panel portion 32 constituting the left and right side frames 30 of the seat back frame 21. Even if the bead 35 is formed to constitute the reinforcing body 33, the present invention can be implemented. In this case, the reinforcing body 33 can be easily configured by forming the reinforcing beads 35 by recessing the corner portions of the rear panel portion 31, the side panel portion 32, and the weight does not increase.
Further, by forming the reinforcing body 33 by a combination of the reinforcing rib 34 and the reinforcing bead 35, it is possible to satisfactorily suppress the expansion deformation of the rear panel portion 31 and the side panel portion 32.
Further, the operation mechanism 70 having the pressure receiving member 80 that receives the backrest load at the time of the rear collision may be configured in any manner.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Seat cushion 12 Reclining lower arm 20 Seat back 21 Seat back frame 30 Side frame 31 Rear panel part 32 Side panel part 33 Reinforcement body 34 Reinforcement rib 35 Reinforcement bead 36 Reinforcement panel 50 Active headrest 57 Lock mechanism 58 Unlocking member 60 Interlocking cable 61 Outer cable 65 Inner cable 70 Operating mechanism 80 Pressure receiving member

Claims (3)

An active headrest is mounted on the upper portion of the seat back, an operating mechanism having a pressure receiving member is mounted inside the seat back, and the active headrest is moved by the operating mechanism when a backrest load at the time of a rear impact is applied to the pressure receiving member. A vehicle seat configured to protrude toward the back of the seated occupant,
The seat back frame of the seat back includes left and right side frames, an upper frame mounted over the upper ends of the side frames, and a lower panel mounted over the lower portions of the side frames,
An operating mechanism having the pressure receiving member is mounted on the lower panel,
The both side frames have a rear panel part and a side panel part bent forward from the side edge part of the rear panel part at a predetermined angle,
A reinforcing body is provided between the rear panel portion and the side panel portion, which suppresses the expanding deformation of both the panel portions and reduces the backward deformation of the lower panel. Vehicle seat. The vehicle seat according to claim 1,
The reinforcing body includes a reinforcing rib mounted between the rear panel portion and the side panel portion,
A vehicle seat comprising at least one of reinforcing beads formed at corners of the rear panel portion and the side panel portion. The vehicle seat according to any one of claims 1 and 2,
A vehicle seat characterized in that a reinforcing panel is mounted between the left and right side frames and overlaid on the lower panel.

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