JP2014172493A - Seat back structure of vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back structure of a vehicular seat in which an occipital part of a seating person can be supported suitably while improving seating comfortableness.SOLUTION: A back frame 11 of a seat back comprises a base frame body 20 and a front side support body 30 which has elasticity receiving a backrest load, The front side support body 30 includes integrally a lower constitution part 31 which is connected to the lower part of the base frame body 20 as rotatable around a horizontal axis line, an elastically-stretching part 33 installed as elastically-stretchable, an upper constitution part 34 which is connected to the upper part of the base frame body 20 as rotatable around the horizontal axis line, and a head rest part 38 which is installed at the center of the upper end part of the upper constitution part 34. When the backrest load acts to the front side support body 30 to rotate the lower constitution part 31 and the upper constitution part 34 around the horizontal axis line and the elastically-stretching part 33 are flexure-deformed backward, the upper constitution part 34 and the head rest part 38 are integrally displaced forward.

Description

  The present invention relates to a seat back structure for a vehicle seat.

A seat back structure for a vehicle seat is disclosed in, for example, Patent Document 1.
In the seat back structure for a vehicle seat disclosed in Patent Document 1, a waist support portion of a resin seat back frame is formed in a longitudinal cross-sectional wave shape having a uniform thickness. As a result, the load from the occupant is received by the corrugated mountain portion of the lumbar support portion via the cushion when seated. That is, when the occupant is seated, the load from the occupant is supported by the wave-shaped elastic portion of the waist support portion. And a passenger | crew's waist | hip | lumbar part is supported by the elastic force of a waist | hip | lumbar part support part. Thereby, the waist corresponding part of the cushion is prevented from sinking locally, and the sitting comfort is improved.

JP-A-11-137366

By the way, in the seat back structure disclosed in Patent Document 1, the waist corresponding part of the cushion is supported by supporting the waist of the seated occupant (occupant) by the elastic force of the waist support that is formed in a wave shape in the longitudinal section. Sitting comfort can be improved by suppressing the sinking locally.
However, it is assumed that the waist support portion having a wave shape in the longitudinal section is elastically deformed into a curved shape by sinking backward when a seated person's load is applied, but hardly changes in the vertical direction.
For this reason, for example, even if the seat load is applied to the lumbar support portion and the lumbar support portion sinks rearward and is elastically deformed in a curved shape at the time of rear-end collision of the vehicle, the upper part of the resin seat back frame The position of the headrest provided on the head hardly changes. For this reason, the case where a seated person's back head cannot be suitably supported by a headrest is assumed.

  In view of the above problems, an object of the present invention is to provide a seat back structure for a vehicle seat that can suitably support the back of the head of a seated person while improving the sitting comfort.

In order to solve the above-mentioned problems, in the seat back structure for a vehicle seat according to claim 1 of the present invention, the back frame of the seat back of the vehicle seat is arranged on the front side of the base frame body and the base frame body. A front support body having elasticity for receiving a backrest load,
The front side support body is connected to a lower part of the base frame body so as to be rotatable around a horizontal axis, and
An elastic stretchable portion provided on the upper side of the lower component portion so as to be elastically stretchable;
An upper component part provided on the upper side of the elastic expansion and contraction part and connected to the upper part of the base frame body so as to be rotatable around a horizontal axis;
A headrest portion provided at a central portion of an upper end portion of the upper component portion;
In one piece,
When a backrest load is applied to the front support and the lower component and the upper component are rotated about their respective horizontal axes so that the elastic expansion and contraction portion is curved and deformed backward, the upper component is integrated with the upper component. The headrest portion is configured to be rotated about the horizontal axis and displaced forward.

According to the said structure, a seating comfort can be improved by elastically supporting a seated person's back part with the elastic force of a front side support body.
In addition, for example, when the vehicle is rearwardly impacted, the backrest load of the seated person acts on the front support, and the elastic component expands backward by rotating the lower component and the upper component about their respective horizontal axes. When the head is deformed, the headrest portion is rotated around the horizontal axis integrally with the upper component portion and displaced forward.
And a seated person's back head can be suitably supported by the headrest part displaced ahead.

The vehicle seat back structure according to claim 2 is the vehicle seat back structure according to claim 1,
The upper component part is connected to the upper part of the base frame body with a long hole-like guide hole that is long in the vertical direction, and is pivotably connected to the vertical axis and movable in the vertical direction by the shaft body. .

According to the above configuration, for example, at the time of a rear-end collision of the vehicle, the seat backrest load acts on the front support, and the lower and upper components are rotated about their respective horizontal axes so that the elastic expansion and contraction unit is provided. When the elastic expansion / contraction part is subsequently elastically deformed and extended after being bent and deformed rearward, the upper component part is guided by the guide hole and the shaft and moves upward. Thereby, the headrest part integral with the upper component part is displaced forward and upward.
And a seated person's back head can be supported still more suitably by the headrest part displaced to the front and the upper part.

It is a side view which shows the seat back structure of the vehicle seat which concerns on Example 1 of this invention. It is a perspective view which shows the state by which the front side support body was similarly mounted | worn with the front side of the base frame body of the seat back. It is a perspective view which shows the state from which the base frame body and the front side support body were similarly separated. It is sectional drawing which similarly shows the connection part of the upper part of a base frame body and a front side support body. It is sectional drawing which similarly shows the connection part of the lower part of a base frame body and a front side support body. Similarly, when the backrest load of the seated person acts on the front support, the headrest portion is displaced forward when the elastic elastic portion is bent and deformed backward. Similarly, when the backrest load of the seated person acts on the front support and the elastic stretchable part is extended upward, the headrest part is displaced forward and upward.

  A mode for carrying out the present invention will be described according to an embodiment.

A vehicle seat back structure according to Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a vehicle seat such as a vehicle, an aircraft, a ship, or the like is mounted on a rear portion of a seat cushion 1 by a recliner 60 so that a back frame 11 that forms a skeleton of a seat back can be adjusted in the front-back direction.
The back frame 11 constituting the seat back structure includes a base frame body 20 and a front support body 30 which is disposed on the front side of the base frame body 20 and has elasticity to receive a seat back load.

As shown in FIG. 3, the base frame body 20 is formed by pressing a steel plate, and a back panel portion 24 and an upper bent at a right angle from the upper edge of the back panel portion 24 to the front. The frame portion 21, the left and right side frame portions 22 bent at right angles from the left and right edge portions of the back panel portion 24, and a metal pipe material laid across the lower portions of the left and right side frame portions 22. The lower frame portion 23 is integrally provided. A recliner 60 and a lower arm 61 are disposed below the left and right side frame portions 22.
In addition, a support receiving portion 25 extending in the up-down direction protrudes forward from the center of the back panel 24 in the width direction (left-right direction). Further, the back panel portion 24 is provided with a plurality of weight reduction holes 28 for weight reduction located on both sides of the support receiving portion 25.

As shown in FIGS. 1 to 3, the front support body 30 is integrally molded with a resin material and has elasticity, and from the lower side to the upper side, the lower component part 31, the elastic stretchable part 33, and the upper structure The portion 34 and the headrest portion 38 are integrally and continuously formed.
The lower component part 31 supports a seated person's waist part, and is formed in the convex curve shape toward the front. Moreover, the lower connection part 32 protrudes toward the left and right both sides of the lower part of the lower structure part 31 toward back.
As shown in FIG. 5, the left and right lower connection portions 32 include bushes 40, stepped bolts 41, and fastening nuts 45 at the lower portions of the left and right side frame portions 22 of the base frame body 20. The coupling mechanism is coupled so as to be rotatable around the horizontal axis.

As shown in FIGS. 1 to 3, the elastic stretchable portion 33 supports the back of the seated person, and is provided on the upper side of the lower connecting portion 32 and has a longitudinal cross-sectional wave shape (bellows shape) that can be elastically stretched in the vertical direction. ).
The upper component part 34 is supported from the upper part of the back of the seated person to the shoulder part, and one or a plurality of vertical ribs 35 and horizontal ribs 36 are formed on the back surface thereof to enhance rigidity.
Further, a headrest portion 38 is formed integrally and continuously at the central portion in the width direction of the upper edge portion of the upper component portion 34, and one or a plurality of headrest portions 38 extend upward from the upper component portion 34 on the back surface of the headrest portion 38. The vertical ribs 35 are formed to increase the rigidity.
Further, upper connecting portions 37 protrude rearward from the left and right side portions of the upper portion of the upper component portion 34.
As shown in FIG. 4, the left and right upper connecting portions 37 include a resin guide member 50 having a guide hole 51 that is long in the vertical direction, a bush 55, a stepped bolt 56, and a fastening nut 59. It is connected to the provided connecting mechanism so as to be rotatable about the horizontal axis and movable in the vertical direction.

As shown in FIG. 4, the guide member 50 has a flange portion 53 at the base end, and the guide cylinders 52 in which the guide holes 51 are penetrated are the left and right side frame portions 22 of the base frame body 20. It is fitted into a long hole vertically inserted through the upper portion of the guide cylinder 52, and a locking claw 54 at the tip of the guide tube 52 is elastically locked to the side frame portion 22.
Then, a stepped bolt 56 is inserted into the guide hole 51 of the guide tube 52 via the bush 55, and a fastening nut 59 is fastened to the male thread portion of the stepped bolt 56, so The connecting portion 37 is rotatable on the upper part of the left and right side frame portions 22 of the base frame body 20 around the center line (that is, the horizontal axis line) of the shaft body portion 58 of the stepped bolt 56, and in the guide hole 51. It is connected so that it can move up and down along.

The vehicle seat back structure according to the first embodiment is configured as described above.
Therefore, the seating comfort can be improved by elastically supporting the back of the seated person by the elastic force of the front support 30.
In addition, for example, when the vehicle is rearwardly impacted, the backrest load of the seated person acts on the front support 30, and as shown in FIG. 6, the lower component 31 and the upper component 34 are respectively connected to the stepped bolts 41, When the elastic telescopic part 33 is bent and deformed backward to a position where it abuts on the support receiving part 25 of the back frame 11 by turning around the horizontal axis centering on the 56 shaft body parts 43 and 58, the upper structure The headrest portion 38 is rotated around the horizontal axis integrally with the portion 34 and displaced forward.
Then, the headrest portion 38 displaced forward can suitably support the back of the seated person.

Further, in the first embodiment, the upper component portion 34 of the front support 30 includes a long-hole-shaped guide hole 51 that is long in the vertical direction of the guide member 50 disposed on the upper portion of the base frame body 20 and a stepped bolt. A shaft body portion 43 of 41 is connected so as to be rotatable about a horizontal axis and movable in the vertical direction.
For this reason, for example, at the time of rear-end collision of the vehicle, the seat back load acts on the front support 30, and the lower component 31 and the upper component 34 are connected to the shaft body 43 of the stepped bolts 41 and 56. , 58 is rotated around the horizontal axis about 58, and the elastic expansion / contraction part 33 is bent and deformed backward to a position where it comes into contact with the support receiving part 25 of the back frame 11.
Subsequently, when the elastic stretchable portion 33 is elastically deformed and extended upward along the support receiving portion 25, as shown in FIG. It is guided by the shaft body 43 of the bolt 41 and moves upward. Thereby, the headrest part 38 integral with the upper component part 34 is displaced forward and upward.
Then, the back of the seated person can be more suitably supported by the headrest portion 38 displaced forward and upward.

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 implement with a various form.
For example, in the first embodiment, the case where the upper component 34 of the front support 30 is connected to the upper part of the base frame 20 so as to be rotatable about the horizontal axis and movable in the vertical direction is exemplified. The present invention can be implemented without necessarily moving in the vertical direction.

DESCRIPTION OF SYMBOLS 11 Back frame 20 Base frame body 30 Front side support body 31 Lower structure part 33 Elastic expansion-contraction part 34 Upper structure part 38 Headrest part 41 Stepped bolt 43 Shaft part 50 Guide member 51 Guide hole 56 Stepped bolt 58 Shaft part

Claims (2)

A back frame of a seat back of a vehicle seat includes a base frame body and a front support body that is disposed on the front side of the base frame body and has elasticity to receive a backrest load,
The front side support body is connected to a lower part of the base frame body so as to be rotatable around a horizontal axis, and
An elastic stretchable portion provided on the upper side of the lower component portion so as to be elastically stretchable;
An upper component part provided on the upper side of the elastic expansion and contraction part and connected to the upper part of the base frame body so as to be rotatable around a horizontal axis;
A headrest portion provided at a central portion of an upper end portion of the upper component portion;
In one piece,
When a backrest load is applied to the front support and the lower component and the upper component are rotated about their respective horizontal axes so that the elastic expansion and contraction portion is curved and deformed backward, the upper component is integrated with the upper component. Further, the seatrest structure for a vehicle seat is characterized in that the headrest portion is rotated about the horizontal axis and displaced forward. The vehicle seat back structure according to claim 1,
The upper component part is connected to the upper part of the base frame body with a long hole-like guide hole that is long in the vertical direction, and is pivotably connected to the vertical axis and movable in the vertical direction by the shaft body. Seat back structure for vehicle seats.

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