JP2010215015A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an operating performance of an active headrest with a simple configuration. <P>SOLUTION: Perforations 34 are formed at places near outside part of an upper part 30B of a headrest support 30 at an outer peripheral part 18B of a headrest stay insertion hole 40 of a seatback front cover 18 to constitute a weakened part 18C. When a tension more than a predetermined value acts on the outer peripheral part 18B of the headrest stay insertion hole 40 formed at the seatback front cover 18, the weakened part 18C of the seatback front cover 18 is easily broken along the perforations 34, resulting in that a headrest body 16 can be moved up in a rapid manner without being prohibited against its upward motion by the seatback front cover 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle seat applied to a vehicle such as an automobile.

  2. Description of the Related Art Conventionally, a vehicle seat having an active headrest function that moves a headrest upward and approaches a head of a seated occupant when a vehicle such as an automobile collides is known (see, for example, Patent Document 1). ).

JP 2000-125983 A

  However, in the vehicle seat having the above configuration, when the active headrest moves upward, the peripheral portion of the headrest stay insertion hole of the seat back skin is dragged to the active headrest. In order to prevent this, the headrest stay insertion hole of the seat back skin is enlarged, and a cover for concealing the enlarged headrest stay insertion hole is provided. For this reason, the structure of the site | part which supports the headrest stay in a vehicle seat becomes complicated.

  An object of the present invention is to obtain a vehicle seat that can improve the operating performance of an active headrest with a simple configuration in consideration of the above facts.

  According to a first aspect of the present invention, a vehicle seat includes a seat back frame constituting a skeleton of a seat bag of the vehicle seat, and a headrest support that is provided at an upper end portion of the seat back frame and moves upward at the time of a rear body collision. A headrest stay inserted through the bracket and the headrest support bracket and having a headrest main body provided at the upper end portion, and a headrest stay insertion hole for forming the surface portion of the seat back and for inserting the headrest stay are formed. The seat bag skin and the headrest support bracket are provided at the upper end of the headrest support bracket, and support the headrest stay so that the vertical position can be adjusted. Outside the stay insertion hole A headrest support having an outer skin clamping portion for clamping an edge portion, and the seat bag when the headrest stay support bracket moves upward on an outer peripheral portion of a headrest stay insertion hole of the seat bag skin A fragile portion that is broken by a tension acting on the skin is formed.

  Therefore, the headrest support bracket moves upward during a vehicle body rear collision, and this movement sandwiches the outer peripheral edge of the headrest stay insertion hole between the inner periphery of the upper end of the headrest support bracket and the skin clamping portion of the headrest support. The seat bag skin is pulled upward. Under the present circumstances, the weak part formed in the outer peripheral part of the headrest stay insertion hole of a seat bag skin will fracture | rupture with the tension | tensile_strength which acts on a seat bag skin. As a result, the headrest support bracket can be quickly moved upward. For this reason, the operation performance of the active headrest can be improved with a simple configuration in which the weakened portion is formed in the outer peripheral portion of the headrest stay insertion hole of the seat bag skin.

  The vehicle seat according to claim 2, wherein a seat back frame constituting a skeleton of a seat bag of the vehicle seat, a headrest support bracket provided at an upper end portion of the seat back frame and moving upward at the time of a vehicle body rear surface collision, A headrest stay that is inserted through the headrest support bracket and has a headrest body provided at an upper end portion thereof, and a seat that forms a surface portion of the seatback and has a headrest stay insertion hole for inserting the headrest stay. The headrest stay is inserted between the bag skin and the upper end of the headrest support bracket so as to support the headrest stay so that the vertical position can be adjusted, and between the upper inner periphery of the headrest support bracket. Outer edge of hole A headrest support provided with an outer skin clamping portion for clamping the headrest support bracket, and an upper end inner circumferential portion of the headrest support bracket for clamping an outer peripheral portion of the headrest stay insertion hole of the seat bag outer skin, and an outer skin clamping of the headrest support A plurality of ribs for supporting the seat bag skin at the front end are formed on at least one of the portions.

  Therefore, the headrest support bracket moves upward during a vehicle body rear collision, and this movement sandwiches the outer peripheral edge of the headrest stay insertion hole between the inner periphery of the upper end of the headrest support bracket and the skin clamping portion of the headrest support. The seat bag skin is pulled upward. At this time, the seat bag skin is supported by tip portions of a plurality of ribs provided on at least one of the inner periphery of the upper end of the headrest support bracket and the skin sandwiching portion of the headrest support, and friction when pulling out the seat bag skin The power is getting smaller. For this reason, the tension acting on the seat bag cover releases the seat bag cover, and the headrest support bracket moves quickly upward. As a result, the operation performance of the active headrest can be improved with a simple configuration in which ribs are provided on at least one of the inner peripheral portion of the upper end of the headrest support bracket and the skin clamping portion of the headrest support.

  As described above, in the vehicle seat according to claim 1 of the present invention, the operation performance of the active headrest can be improved with a simple configuration.

  In the vehicle seat according to claim 2 of the present invention, the operation performance of the active headrest can be improved with a simple configuration.

It is a sectional side view which shows the principal part of the vehicle seat which concerns on 1st Embodiment of this invention. FIG. 2 is an enlarged cross-sectional view taken along a line 2-2 in FIG. FIG. 3 is an enlarged cross-sectional view taken along a line 3-3 in FIG. 1. It is a sectional side view which shows the operating state of the vehicle seat which concerns on 1st Embodiment of this invention. It is a sectional side view which shows the principal part of the vehicle seat which concerns on 2nd Embodiment of this invention. FIG. 6 is an enlarged cross-sectional view taken along a 6-6 cross-sectional line in FIG. 5. It is a sectional side view which shows the operation state of the vehicle seat which concerns on 2nd Embodiment of this invention. [First Embodiment]

  Hereinafter, a first embodiment of a vehicle seat according to the present invention will be described with reference to FIGS. In these drawings, an arrow UP appropriately shown indicates the upward direction of the vehicle body, and an arrow FR indicates the forward direction of the vehicle body.

  As shown in FIG. 1, the seat back 12 of the vehicle seat 10 includes a seat back main body 14 and a headrest main body 16 provided above the seat back main body 14. The seat back main body 14 has a main frame 17 made of a pipe material bent in a substantially inverted U shape disposed inside.

  The surface of the seat back body 14 is covered with a seat back skin 18, and a seat back pad 19 is disposed inside the seat back skin 18.

  Two frame-shaped brackets 20 are attached to the front side of the outer peripheral portion of the upper pipe 17 </ b> A of the main frame 17 at a predetermined interval in the vehicle width direction. The support bracket 22 is inserted so as to be movable in the vertical direction of the vehicle body.

  The headrest support bracket 22 has a cylindrical shape whose longitudinal direction is the vertical direction, and is connected to active headrest driving means (not shown). The active headrest driving means has a well-known structure. For example, when the actuator is pushed rearward by the occupant's lower back seated in the vehicle seat 10 due to a rear collision of the vehicle body, the headrest support bracket 22 is moved upward (the headrest main body 16 In the direction of approaching the head of an occupant seated on the vehicle seat 10.

  A headrest stay 28 having a headrest body 16 provided at the upper end portion is inserted into the inner peripheral portion of the headrest support bracket 22, and a headrest support 30 is provided at the upper end portion of the headrest support bracket 22.

  The headrest stay 28 is inserted through the headrest support 30, and the headrest stay 28 is supported by the headrest support 30 so that the vertical position can be adjusted. That is, the headrest support 30 is provided with a headrest stay vertical position adjusting means (not shown) so that the vertical support position of the headrest stay 28 (the vertical position of the headrest body 16) can be adjusted.

  As shown in FIG. 3, the cross-sectional shape orthogonal to the axial direction of the headrest support bracket 22 is a rectangular frame cross-section, and the cross-sectional shape orthogonal to the axial direction of the headrest stay 28 is a circular cross-section. The headrest support 30 has a cross-sectional shape in which the outer peripheral portion is rectangular and the inner peripheral portion is circular.

  As shown in FIG.1 and FIG.4, the lower part of the headrest support 30 is the skin clamping part 30A, and the thickness M1 in the direction (horizontal direction) orthogonal to the axial direction (vertical direction) of the skin clamping part 30A is It is thinner than the thickness M2 in the direction orthogonal to the axial direction of the upper portion 30B, and this skin clamping portion 30A is inserted into the upper end opening 22A of the headrest support bracket 22.

  A headrest stay insertion hole 40 for inserting the headrest stay 28 is formed in the seat bag skin 18. Further, the outer peripheral edge portion 18A of the headrest stay insertion hole 40 of the seat bag skin 18 is sandwiched between the inner peripheral portion of the upper end opening 22A of the headrest support bracket 22 and the skin clamping portion 30A of the headrest support 30. .

  As shown in FIG. 2, a perforation 34 is formed on the outer peripheral portion 18 </ b> B of the headrest stay insertion hole 40 formed in the seat bag skin 18 at a portion near the outside of the upper portion 30 </ b> B of the headrest support 30. The part where 34 is formed is a fragile part 18C that is easily broken compared to other parts. Further, the perforations 34 of the seat bag skin 18 are formed at a predetermined pitch P1 at a predetermined distance Y1 from the outer peripheral surface of the upper portion 30B of the headrest support 30.

  Therefore, as shown in FIG. 4, when the headrest support bracket 22 and the headrest support 30 move upward (in the direction of arrow A in FIG. 4), a predetermined value is applied to the outer peripheral portion 18B of the headrest stay insertion hole 40 of the seat bag skin 18. When the above tension F <b> 1 is applied, the fragile portion 18 </ b> C of the seat bag skin 18 is easily broken along the perforation 34.

  Next, the operation of this embodiment will be described.

  In the normal use state, as shown in FIGS. 1 and 3, the headrest stay of the seat bag skin 18 is between the inner peripheral portion of the upper end opening 22 </ b> A of the headrest support bracket 22 and the skin sandwiching portion 30 </ b> A of the headrest support 30. The outer peripheral edge 18A of the insertion hole 40 is sandwiched. For this reason, the headrest stay insertion hole 40 formed in the seat bag skin 18 is not exposed outside the upper portion 30B of the headrest support 30. As a result, the appearance quality can be improved without providing a cover or the like on the headrest support 30.

  On the other hand, at the time of a vehicle rear-side collision in which another vehicle collides from the rear side of the vehicle body, the active headrest driving means is operated, and as shown in FIG. When moved in the direction A), the tension F1 acts on the outer peripheral portion 18B of the headrest stay insertion hole 40 of the seat bag skin 18.

  At this time, in this embodiment, the perforation 34 is formed in the outer peripheral portion 18B of the headrest stay insertion hole 40 of the seat bag skin 18 in the vicinity of the outside of the upper portion 30B of the headrest support 30 and becomes the fragile portion 18C. ing. For this reason, when a tension F1 of a predetermined value or more acts on the outer peripheral portion 18B of the headrest stay insertion hole 40 of the seat bag skin 18, the fragile portion 18C of the seat bag skin 18 is easily broken along the perforation 34.

  As a result, the headrest body 16 supported by the headrest stay 28 can quickly move upward without being prevented from moving upward by the seat bag skin 18.

  As described above, in this embodiment, the operation performance of the active headrest can be improved with a simple configuration in which the fragile portion 18C is formed by the perforation 34 on the outer peripheral portion 18B of the headrest stay insertion hole 40 of the seat bag skin 18.

[Second Embodiment]

  Next, 2nd Embodiment of the vehicle seat of this invention is described according to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 5 and 6, in the present embodiment, a plurality of ribs 50 are formed to protrude along the axial direction on the outer peripheral portion of the skin clamping portion 30 </ b> A of the headrest support 30. Are formed at predetermined intervals in the circumferential direction of the skin sandwiching portion 30A.

  As shown in FIG. 6, the cross-sectional shape of the rib 50 viewed from the axial direction (vertical direction) of the headrest support 30 is a semicircular shape, and the inner periphery of the tip end portion 50 </ b> A and the upper end opening portion 22 </ b> A of the headrest support bracket 22. The outer peripheral edge portion 18A of the headrest stay insertion hole 40 of the seat bag skin 18 is sandwiched between the two portions.

  That is, the contact area between the rib 50 and the seat bag skin 18 is reduced, and the frictional force when the seat bag skin 18 is pulled out from between the rib 50 and the upper end opening 22A of the headrest support bracket 22 is reduced. ing.

  Therefore, in the present embodiment, the active headrest driving means is activated at the time of the rear collision of the vehicle body, and the headrest support bracket 22 and the headrest support 30 are moved upward (in the direction of arrow A in FIG. 7) together with the headrest body 16 as shown in FIG. When moved, the tension F <b> 1 acts on the outer peripheral portion 18 </ b> B of the headrest stay insertion hole 40 formed in the seat bag skin 18.

  At this time, the outer peripheral edge portion 18A of the headrest stay insertion hole 40 of the seat bag skin 18 is sandwiched between the tip portion 50A of the rib 50 and the inner peripheral portion of the upper end opening 22A of the headrest support bracket 22, and the rib The contact area between 50 and the seat bag skin 18 is small, and the frictional force when the seat bag skin 18 is pulled out is reduced. For this reason, when a tension F1 of a predetermined value or more acts on the outer peripheral portion 18B of the headrest stay insertion hole 40 of the seat bag skin 18, the seat bag skin 18 is easily formed between the rib 50 and the upper end opening 22A of the headrest support bracket 22. Exit.

  As a result, the headrest body 16 supported by the headrest stay 28 can quickly move upward without being prevented from moving upward by the seat bag skin 18.

  Thus, in this embodiment, the operation performance of the active headrest can be improved with a simple configuration in which the ribs 50 are formed in the skin sandwiching portion 30A of the headrest support 30.

  [Supplementary explanation of the above embodiment]

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the first embodiment, the fragile portion 18C is formed in the seat bag skin 18 by the perforation 34, but the fragile portion 18C is formed by other weak portion forming means such as a thin-walled portion instead of the perforation 34. It is good also as a structure.

  In the second embodiment, the rib 50 may be provided on the inner peripheral side of the upper end opening 22 </ b> A of the headrest support bracket 22, or the rib 50 may be provided on the upper surface opening of the headrest support 30 and the skin clamping portion 30 </ b> A of the headrest support bracket 22. You may provide in both the inner peripheral side in the part 22A. Further, the cross-sectional shape of the rib 50 is not limited to a semicircular shape, and may be another cross-sectional shape such as a triangular shape.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat back 14 Seat back main body 16 Headrest main body 18 Seat back skin 18C Seat back skin fragile part 22 Headrest support bracket 28 Headrest stay 30 Headrest support 30A Headrest support skin perforation 34 Seat back skin perforation 40 Headrest stay insertion hole in seat back skin 50 Rib 50A Rib tip

Claims (2)

A seat back frame constituting a skeleton of a seat bag of a vehicle seat;
A headrest support bracket provided at an upper end portion of the seat back frame and moving upward at the time of a vehicle body rear surface collision;
A headrest stay inserted through the headrest support bracket and having a headrest main body provided at the upper end;
While constituting the surface portion of the seat back, a seat bag skin formed with a headrest stay insertion hole for inserting the headrest stay;
Provided at the upper end portion of the headrest support bracket, and supports the headrest stay so that the vertical position can be adjusted, and the outer peripheral edge of the headrest stay insertion hole of the seat bag skin between the headrest support bracket and the inner peripheral portion of the upper end of the headrest support bracket A headrest support provided with an epidermis clamping part for clamping the part,
A vehicular seat having a fragile portion that is ruptured by a tension acting on the seat bag skin when the headrest stay support bracket moves upward at the outer periphery of the headrest stay insertion hole of the seat bag skin . A seat back frame constituting a skeleton of a seat bag of a vehicle seat;
A headrest support bracket provided at an upper end portion of the seat back frame and moving upward at the time of rear collision of the vehicle body;
A headrest stay that is inserted through the headrest support bracket and has a headrest body at the upper end; and
While constituting the surface portion of the seat back, a seat bag skin formed with a headrest stay insertion hole for inserting the headrest stay;
Provided at the upper end portion of the headrest support bracket, and supports the headrest stay so that the vertical position can be adjusted, and the outer peripheral edge of the headrest stay insertion hole of the seat bag skin between the headrest support bracket and the inner peripheral portion of the upper end of the headrest support bracket A headrest support provided with an epidermis clamping part for clamping the part,
And at least one of the inner periphery of the upper end of the headrest support bracket that sandwiches the outer periphery of the headrest stay insertion hole of the seat bag skin and the skin sandwiching portion of the headrest support at the tip portion. A vehicle seat having a plurality of supporting ribs.

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