JP6976880B2 - Mat mounting structure on the seat back and vehicle seat - Google Patents

Description

The present invention relates to a mat mounting structure in a seat back and a vehicle seat.

As described in Patent Document 1, in the internal structure of a seat back in a vehicle seat, a structure is known in which a mat for supporting the back of a seated occupant is attached to the seat back frame via a guide wire.

Specifically, the guide wire is formed by having a pair of vertical wire portions that extend vertically and are spaced apart from each other on the left and right, and a horizontal wire portion that connects the lower portions of the pair of vertical wire portions in the left-right direction. Has been done.

Then, the horizontal wire portion is supported by the lower frame so as to be pivotable, and the pair of vertical wire portions have an insertion hole formed in the upper frame of the seat back frame with the upper portion being a straight rod-shaped straight portion. It is supported by being inserted and supported so that it can move up and down.

Japanese Patent Application Laid-Open No. 2015-0671772

In the seat back of the conventional vehicle seat, the mat moves backward from the natural position due to the force received from the back of the seated occupant, and returns to the natural position when the occupant leaves the seat.

In the front-back movement of this mat, the vertical wire part of the guide wire moves up and down in the insertion hole of the upper frame, and the horizontal wire part is supported so that it can be pivoted (rotated around the support part) with respect to the lower frame. By doing so, it is permissible.

However, if the seat back is strongly pushed backward by the back of the seated occupant, such as when a vehicle is hit, the mat will move significantly backward with respect to the seat back frame, but the lateral wire portion will be within the range of rotation. Only backward movement is allowed, and large backward movement is not allowed.

Therefore, there is a possibility that a large reaction force will be applied from the lower part of the mat due to the restriction of backward movement in the vicinity of the waist of the seated occupant, and there is room for improvement.

Therefore, the problem to be solved by the present invention is a mat mounting structure in a seat back in which there is no possibility that a large reaction force is applied to the occupant from the mat side even when the seat back is strongly pushed backward by the back of the occupant. And to provide vehicle seats.

In order to solve the above problems, the present invention has the following configuration.
1) It is a mat mounting structure in the seat back for mounting the mat that receives the force from the back of the occupant leaning against the seat back to the seat back frame.
A guide wire attached to the mat and having a widthwise extending portion extending in the width direction of the seat back frame on the tip end side or the root side of the seat back frame.
A holder having a base portion that rotatably supports the widthwise extending portion around its axis and a mounting portion attached to the seat back frame.
Equipped with
When a force of a predetermined value or more in the direction of detaching from the seat back frame due to the force from the back received by the mat is applied to the holder from the extending portion in the width direction, the width direction is applied. It is a mat mounting structure in the seat back in which the extending portion is separated from the base portion or the holder is separated from the seat back frame and the extending portion in the width direction is separated from the seat back frame.
2) The mounting portion is the mat mounting structure in the seat back according to 1), wherein the mounting portion is mounted to the seat back frame by a snap fit.
3) When a force of the predetermined value or more is applied to the holder, the base portion or the mounting portion is broken and the widthwise extending portion is separated from the seat back frame 1). Or it is the mat mounting structure in the seat back described in 2).
4) With a seat cushion,
With a seat back,
The seat back frame arranged inside the seat back and
The mat mounted by the mat mounting structure in the seat back according to any one of 1) to 3) with respect to the seat back frame.
Vehicle seat with.

According to the present invention, even when the seat back is strongly pushed backward by the back of the occupant, there is no possibility that a large reaction force is applied to the occupant from the mat side.

FIG. 1 is a perspective view for explaining a frame structure of a seat ST, which is an example of a vehicle seat according to an embodiment of the present invention. FIG. 2 is a partial perspective view for explaining the superstructure of the mat 5 and the guide wire 6 included in the seat ST. FIG. 3 is a partial perspective view for explaining the lower structure of the mat 5 and the guide wire 6. FIG. 4 is a cross-sectional view for explaining a holder 7 for fixing the guide wire 6 to the lower panel portion 1. FIG. 5 is a partial perspective view for explaining the detachment of the holder 7 when a large backward force is applied to the mat 5.

The frame structure of the vehicle seat ST provided with the mat mounting structure TK, which is an example of the mat mounting structure in the seat back according to the embodiment of the present invention, will be described with reference to FIG.

FIG. 1 is a perspective view for explaining a frame structure of a vehicle seat ST (hereinafter, also simply referred to as a seat ST). In the following description, each direction of front, rear, left, right, up and down is defined by the arrow shown in FIG. 1 based on the state in which the seat ST is mounted on the vehicle. The left-right direction is also called the width direction.

In FIG. 1, the seat ST has a seat cushion ST1 in which the seat cushion frame FR1 is covered with a cushion member, and a seat back ST2 in which the seat back frame FR2 is covered with a cushion member.

A pair of movable rails 62, 62 are attached to the lower part of the seat cushion frame FR1. The movable rails 62 and 62 are supported so as to be movable in the front-rear direction with respect to the rails 61 and 61 as fixing members installed on the floor surface C1 of the vehicle. As a result, the seat ST can slide back and forth with respect to the rails 61 and 61.

The seat back frame FR2 arranged inside the seat ST is rotatably supported around the rotation axis CLa extending to the left and right at the rear portion of the seat cushion frame FR1.

The seat back frame FR2 is a so-called panel frame formed in a frame shape by a panel, and the direction connecting the root side and the tip side is the longitudinal direction.

Specifically, the seat back frame FR2 includes a lower panel portion 1 extending in the left-right direction at the lower portion, a left side panel portion 2L and a right side panel portion 2R rising in the longitudinal direction (generally in the vertical direction in FIG. 1) from the left and right ends of the lower panel portion 1. And an upper panel portion 3 that connects the left side panel portion 2L and the tip end portion of the right side panel portion 2R in the left-right direction (width direction).

The upper panel portion 3 includes a pair of shoulder portions 4 and 4 that are inclined and connected to the left side panel portion 2L and the right side panel portion 2R, respectively, and a through hole 4a is formed in each shoulder portion 4. (See also Figure 2).

In the central space surrounded by the frame of the seat back frame FR2, a guide wire 6 supported by the seat back frame FR2 and a thin plate-shaped mat 5 attached to the guide wire 6 are arranged.

The guide wire 6 is supported on the seat back frame FR2 by two upper left and right support portions SL and SR corresponding to the pair of through holes 4a and a lower support portion SB.

Next, the mat 5 and the guide wire 6 will be described with reference to FIGS. 2 and 3.

FIG. 2 is a partial perspective view of the upper part of the mat 5 viewed from slightly above the rear left, and FIG. 3 is a partial perspective view of the lower portion of the mat 5 viewed from slightly above the rear right.

The guide wire 6 is formed of a linear spring material, and a lubricating layer that improves sliding performance with other members is formed on the surface of the guide wire 6.

The guide wire 6 is an upper connection in which the vertical wire portions 6a and 6a extending vertically separated from each other on the rear surface side of the mat 5 and the upper and lower portions of the vertical wire portions 6a and 6a are extended and connected in the width direction, respectively. It has a portion 6b and a lower connecting portion 6c.

The upper connecting portion 6b and the lower connecting portion 6c are also referred to as extending portions in the width direction.

The guide wire 6 further has an arm portion 6d extending diagonally upward to the left and right from the connecting portion Pt1 to which the upper connecting portion 6b and the vertical wire portion 6a are connected. Hereinafter, the left arm portion is referred to as an arm portion 6dL, and the right arm portion is referred to as an arm portion 6dR.

The mat 5 is attached to the vertical wire portion 6a and the upper connecting portion 6b by a plurality of fasteners 5a and 5b, respectively, so as to be deformed together without being separated by an external force.

The lower connecting portion 6c is formed in a straight shape, and is rotatably attached to the lower panel portion 1 around the axis CL6c extending in the left-right direction by a plurality of (three in this example) holders 7.

The holder 7 is made of, for example, resin, and is attached to the lower panel portion 1 by a snap-fit structure.

The mounting state of the holder 7 is shown in the cross-sectional view of FIG.

In FIG. 4, the holder 7 has a base portion 7b having an insertion hole 7a and a pair of engaging legs 7c, 7c protruding from the base portion 7b.

The lower connecting portion 6c is rotatably inserted into the insertion hole 7a around the axis CL6c, and the holder 7 elastically deforms the pair of engaging legs 7c and 7c into the engaging hole 1a formed in the lower panel portion 1. It is attached to the lower panel portion 1 by a snap fit that is inserted and engaged with the lower panel portion 1. Therefore, the engaging leg 7c functions as a mounting portion for mounting the holder 7 to the lower panel portion 1.

The arm portion 6dL and the arm portion 6dR have a symmetrical shape. Hereinafter, the arm portion 6dR will be described as a representative, and the reference numerals indicating the portions will be common to the left and right.

The arm portion 6dR has an inclined extending portion 6d1 extending diagonally upward from the connecting portion Pt1 connecting the upper connecting portion 6b and the vertical wire portion 6a, and a bending portion bent in the left-right direction in order to improve the elasticity of twisting and bending. It has a 6d2 and a straight portion 6d3 extending vertically upward from the bent portion 6d2.

The straight portion 6d3 is inserted into the through hole 4a formed in the shoulder portion 4 described above so as to be vertically movable from the lower side to the upper side.

As a result, in the mat 5 and the guide wire 6, the lower connecting portion 6c of the guide wire 6 is rotatably supported by the holder 7 around the axis CL6c with respect to the lower panel portion 1 at the lower portion, and the straight portion 6d3 is a through hole at the upper portion. By being inserted through and supported by 4a, it is attached to the seat back frame FR2 so that it can elastically move back and forth.

In the above configuration, the holder 7 has a lower connecting portion 6c as shown in FIG. 5 when the force applied to the holder 7 due to the backward movement of the mat 5 is larger than a preset value. It is designed to be separated from the lower panel portion 1.

In this separation, the engaging leg 7c of the holder 7 is elastically deformed to be disengaged from the engaging hole 1a (hereinafter referred to as disengagement separation), and the engaging leg 7c or the base 7b of the holder 7 is disengaged. It may be either by destruction (hereinafter referred to as destruction separation) or by destruction.

FIG. 5 shows a state in which the lower connecting portion 6c is disengaged and separated from the lower panel portion 1.

When the back of the occupant seated on the seat ST pushes the seat back ST2 backward, the mat 5 under the force from the back moves backward (arrow DRc in FIG. 5), and the back is placed on the base 7b of the holder 7. As a force caused by the force from the guide wire 6, a force Fa in a direction for disengaging the engaging leg 7c from the engaging hole 1a is applied by the lower connecting portion 6c of the guide wire 6.

In particular, in the case of a rear-end collision of a vehicle or the like, the back of the occupant shockably moves the seat back ST2 backward, so that the force Fa becomes a very large value as compared with the case of normal sitting.

When the lower connecting portion 6c is separated from the lower panel portion 1 when the Fa is large by the elastic deformation separation of the holder 7, the holder 7 is elastic when the force Fa becomes a predetermined value or more. It is set and formed in advance so that it is deformed and separated from the engaging hole 1a (lower panel portion 1) and the lower connecting portion 6c is separated from the lower panel portion 1 with the base portion 7b attached.

On the other hand, in the case of breaking separation of the holder 7, when the force Fa becomes a predetermined value or more, the base portion 7b is broken and the lower connecting portion 6c is separated from the base portion 7b and separated from the lower panel portion 1. Or, it is set and formed in advance so that the engaging leg 7c is broken and the lower connecting portion 6c is separated from the lower panel portion 1 with the base portion 7b attached.

As a result, the mat mounting structure TK and the vehicle seat ST provided with the mat mounting structure TK have a lower connecting portion of the guide wire 6 when the seat back ST2 is strongly pushed backward by the back of the seated occupant due to a rear-end collision of the vehicle or the like. The 6c is separated without being restrained by the lower panel portion 1 to allow a large backward movement of the mat 5.

Therefore, unlike the conventional structure in which a large backward movement of the mat 5 is restricted, there is no possibility that a large reaction force is applied to the seated occupant from the mat 5 side.

The present invention is not limited to the embodiments described above, and can be variously modified without departing from the gist of the present invention.

In the mat mounting structure TK of the embodiment, the upper portion of the guide wire 6 is inserted and supported in the through hole 4a as a straight portion 6d3, and the lower connecting portion 6c is formed in the lower portion and supported by the holder 7 on the frame side. Although it is a structure, it may be upside down.

That is, the upper portion of the guide wire may be supported on the frame side by the holder 7, and the lower portion may be used as a straight portion to be inserted and supported in the through hole on the frame side.

The structure for attaching the holder 7 to the lower panel portion 1 is not limited to the snap-fit structure described above. It may be a fastening structure using screws or a tightening structure using a fastener band.

1 Lower panel part, 1a Engagement hole 2L Left side panel part, 2R Right side panel part 3 Upper panel part 4 Shoulder part, 4a Through hole 5 Mat, 5a, 5b Fastener 6 Guide wire 6a Vertical wire part, 6b Upper connection part, 6c Lower connecting part 6d, 6dL, 6dR Arm part, 6d1 inclined extension part, 6d2 bending part 6d3 straight part 7 holder 7a insertion hole, 7b base, 7c engaging leg 61 rail, 62 movable rail CLa rotation axis, CL6c axis, C1 Floor Fa force FR1 Seat cushion frame, FR2 Seat back frame Pt1 Connecting part SL, SR, SB Support part ST Seat (Vehicle seat)
ST1 seat cushion, ST2 seat back TK mat mounting structure

Claims (4)

It is a mat mounting structure in the seat back for mounting the mat that receives the force from the back of the occupant leaning against the seat back to the seat back frame.
A guide wire attached to the mat and having a widthwise extending portion extending in the width direction of the seat back frame on the tip end side or the root side of the seat back frame.
A holder having a base portion that rotatably supports the widthwise extending portion around its axis and a mounting portion attached to the seat back frame.
Equipped with
When a force of a predetermined value or more in the direction of detaching from the seat back frame due to the force from the back received by the mat is applied to the holder from the extending portion in the width direction, the width direction is applied. A mat mounting structure in a seat back in which the extending portion is separated from the base portion or the holder is separated from the seat back frame and the extending portion in the width direction is separated from the seat back frame. The mat mounting structure for a seat back according to claim 1, wherein the mounting portion is mounted to the seat back frame by a snap fit. 1. The mat mounting structure in the seat back according to claim 2. With a seat cushion,
With a seat back,
The seat back frame arranged inside the seat back and
A mat attached to the seat back frame by the mat mounting structure in the seat back according to any one of claims 1 to 3.
Vehicle seat with.

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