JPH0715493Y2 - Seat backrest - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat backrest that is mounted on, for example, an automobile seat to maintain a natural and proper sitting posture of a occupant and to realize a comfortable sitting comfort.

[0002]

2. Description of the Related Art A vehicle seat comprises a horizontal stool and a substantially vertical backrest which is continuous with the stool. For example, when the driver sits in the seat, a large gap is opened between the lower part of the back surface, that is, the upper waist and the seat back, and the abdomen bends inward, and the spine leans forward.
Excessive strain on the lower back makes you tired. Therefore, a back plate for a seat has been proposed in which the waist of a occupant is not tired.
This seat back plate is a bow-shaped elastic frame body (a trapezoidal frame bent in a bow) that leans against the backrest of the seat.
A net-shaped support extension surface is extended to the back, and a vertical connecting pillar facing the seat backrest surface is attached to the back of this bow frame elastic frame body, and it is hung over the back portion of the seat backrest surface to bow. It has a structure in which an elastic band for fixing the frame-shaped elastic frame portion is attached (Actual No. 1-131352).

[0003]

In the conventional seat back plate, the reinforcing column abuts on the seat back surface, and the net-shaped support extension surface bulges forward and projects forward from the seat back surface. . The back of the occupant is supported by the net-shaped bearing extension surface,
By retreating the net-shaped stretched surface portion and bending of the bow-frame-shaped elastic frame body portion, comfortable sitting comfort without fatigue can be realized. However, in this seat back plate, only the connecting column is attached to the back part of the back plate, so that the bow-shaped elastic frame body bent in a bow has a constant curvature. In other words, the height position where the seat backrest bulges forward is constant, and the height position of the bulging portion cannot be changed. Therefore, it is not possible to adjust the curved bulging surface according to the occupant whose body shape (especially sitting height) varies, and there are disadvantages such as not being able to adapt to a person with a high sitting height but not a person with a low sitting height. there were. Also,
When the net-shaped support extension surface loses elastic repulsion due to long-term use, the bowed state of the bow-shaped elastic frame cannot be adjusted, and there is a disadvantage that the function of the backing plate cannot be exerted. .

The present invention solves the above problems and provides a seat backrest that can maintain a natural sitting posture and does not lose elasticity even after long-term use and can realize a comfortable sitting comfort. The purpose is to do.

[0005]

In order to achieve this object, the seat backrest of the present invention has the following structure. The seat backrest is provided with a bow frame-shaped elastic frame body portion that is gradually and largely bulged forward in a forward direction from the upper side portion to the lower side portion, and is stretched on the bow frame-shaped elastic frame body portion,
It is vertically arranged on the rear surface side of the support frame that holds the back surface in a proper sitting posture and the back side of the bow frame-shaped elastic frame body section, and makes it possible to change the curved curvature of the bow frame-shaped elastic frame body section. A chordal band piece that is in contact with the seat back surface and reinforces the bow spring repulsive force, and is arranged orthogonally on the back side of the bow frame-shaped elastic frame portion and outside the chordal band piece. It is characterized by comprising a seat mounting part.

In the seat backrest having such a structure, a frame body portion (bow frame-shaped elastic frame body portion) is formed of an elastic and tough iron wire, and a mesh-shaped toughness is formed in the frame body portion. The support bearing surface is installed. The side surface shape of the frame body portion and the support extension surface portion stretched in the plane of the frame body portion is set to a so-called "bow shape". Further, a chordal band piece is provided on the back side of the frame body portion. By adjusting the length of the chordal band piece, the entire frame body portion including the bearing extension surface portion is pulled and bent like a bow. As a result, the supporting extension surface becomes a curved bulging surface corresponding to the back surface in the correct sitting posture. That is, the bow pressing portion that bulges in the most forward direction of the bow-shaped frame body corresponds to the portion corresponding to the space between the upper waist of the occupant and the seat backrest, and the most curved bulging pressing portion. The most repulsive force is generated. Therefore, the back of the occupant is straightened by the bow pressing portion, the extra load is not placed on the waist, and the natural and most comfortable sitting posture is maintained. In particular, when the backrest is attached to the seat back by the seat attachment portion (rubber band piece), the string-shaped band piece comes into contact with the backrest surface, and as a result, the bow-frame-shaped elastic frame body including the support extension surface portion is obtained. It disperses and absorbs the pressure of the occupant acting on the portion and reinforces the bow-throttled state (repulsive force by compression). Thus, the occupant is not only allowed to maintain a natural and comfortable sitting posture, but also has breathability and a comfortable sitting comfort. Further, since the bow-shaped (bow-shaped) state can be adjusted by the string-shaped band piece, it can be used by any person, and there is no fear that the elastic repulsive force will be lost due to long-term use.

[0007]

FIG. 2 is a plan view showing a concrete example of the seat backrest according to the present invention.

The seat backrest has a bow frame-shaped elastic frame portion 1
And a supporting and extending surface portion 2 stretched on the bow frame-shaped elastic frame body portion 1 for holding a back surface in a proper sitting posture, and a chord shape provided on the back surface side of the bow frame-shaped elastic frame body portion 1. It is composed of a band piece 3 and a seat mounting portion 4 provided on the back surface side of the bow-shaped elastic frame body portion 1 and outside the chordal band piece 3. The bow-frame-shaped elastic frame body portion 1 bends an elastic and tough iron wire 11, bends both ends of a substantially horizontal upper side portion 1a inwardly in an outwardly-spreading manner, and a bent piece portion (both side piece portions). Each of the tip ends of the is bent inward to be molded into a circular frame. This iron wire frame 11 has an upper side 1a
The width is gradually widened from the lower side portion 1b to the lower side portion 1b, and the upper side portion 1a and the lower side portion 1b are set so as to bulge largely in the forward direction. That is, the iron wire frame 11 is set to be a frame body whose side surface has a "bow shape". The iron wire frame 11 is stretched with the bearing extension surface portion 2. In the embodiment, the bearing extension surface portion 2 is made of nylon mesh fabric, polyester mesh fabric,
The mesh ground using the chemical fiber such as is used.
As shown in FIG. 4, the outer peripheral portion of the support stretched surface 2 is wrapped around the iron wire frame 11, and the edge cloth 12 is folded from the outside and the edge cloth (upper / lower) 12 is integrally sewn ( The support extension surface portion 2 is integrally fixed to the overedging suture line 13) and the iron wire frame 11. Therefore, as shown in FIG. 3, the supporting stretched surface portion 2 has an arched surface, and the lower portion has the largest bulge forward and corresponds to the so-called occupant's most natural back surface. That is, the lower portion of the support and extension surface portion 2 and the pressing portion 21 are positioned so as to correspond to the gap between the upper waist of the occupant and the seat back 61.

The chordal band piece 3 is a pair of upper band 31 and lower band 32.
Is fixed to the back side of the upper side portion 1a of the bow-frame-shaped elastic frame body portion 1, and the front end (free end) is provided with a buckle portion 31a with a stopper.
Is installed. The other lower band 32 has its base end fixed to the back side of the lower side 1b of the bow-shaped elastic frame body 1, and the front end of this lower band 32 is inserted into the buckle part 31a with a stopper to stop it. The connection state is fixed by the part. When the lengths of the upper and lower bands 31 and 32 are adjusted, that is, the lengths are set to be short, the bow frame-shaped elastic frame body portion 1 including the support extension surface portion 2 is drawn and bent to bend like a bow, and the pressing portion 21 is further pulled. It is possible to greatly bulge and to increase the elastic repulsion force. In the embodiment, two pairs of chordal band pieces 3 are arranged in parallel.

The seat mounting portion 4 is a rubber band having a constant width in the embodiment, and both ends of the rubber band 4 are horizontally (chordally) on the back sides of both side portions of the bow-frame elastic frame body portion 1. It is fixed to the band piece 3 at right angles. The seat mounting portion 4 is provided outside the chordal band piece 3.
That is, the string-shaped band piece 3 is in contact with the surface of the backrest 61 of the seat 6, and the mounting rubber band 4 is extended to make one round around the outer periphery of the seat backrest 61 so that the backrest device can be attached to the seat 6. (See FIGS. 1 and 3).

In addition, in the embodiment, an example in which the bearing extension surface portion 2 is made of mesh material is shown.
Is not limited to a mesh fabric, and ordinary woven fabric (cloth) can be used as long as it has toughness. In addition, upon implementation, as shown in FIG. 1, the seat cushion 7 to be placed on the seat stool 62 may be connected to the backrest device of the present invention via the connecting piece 5 to be used as a so-called double cushion shape. Of course.

In the seat backrest having such a structure, the frame body portion (bow-shaped elastic frame body portion) 1 is formed by the elastic and tough iron wire 11, and the frame body portion 1 is meshed. A tough support extension surface 2 is stretched. The side surface shape of the frame body portion 1 and the support extension surface portion 2 stretched in the plane of the frame body portion is set to a so-called "bow shape". At the time of use, as shown in FIGS. 1 and 3, the frame body portion 1 including the supporting and extending surface 2 is compressed in the vertical direction, and the connecting length of the chordal band pieces 3 and 3 is set to be short. , The entire frame body portion 1 including the support extension surface portion 2 is pulled and bent like a bow.
As a result, the support extension surface portion 2 becomes a curved bulge surface corresponding to the back surface in the correct sitting posture. That is, the bow pressing portion 21 that bulges in the most forward direction of the bow-shaped frame body portion 1 corresponds to the portion corresponding to the gap between the upper waist of the occupant and the seat back 61, and the most curved pressing force is applied. The largest repulsive force is generated in the portion 21. Therefore, the seat occupant straightens the back muscles by the bow pressing portion 21 and does not put an extra burden on the waist,
The most comfortable sitting posture in nature is maintained. In particular, when the backrest device is attached to the seat backrest 61 by the seat mounting portion 4, the string-shaped band piece 3 comes into contact with the surface of the backrest 61, and as a result, the bow-shaped elastic frame body portion (the support extension surface portion 2). ) 1 bow pulling condition (repulsive force due to compression) is further reinforced,
The pressure on the seat back 61 side by the occupant is repelled. Thus, the occupant is not only allowed to maintain a natural and comfortable sitting posture, but also has breathability and a comfortable sitting comfort. Further, since the bow-shaped (bow-shaped) state can be adjusted by the string-shaped band piece 3, it can be used by any person, and there is no fear that the elastic repulsive force will be lost due to long-term use.

[0013]

According to the present invention, as described above, the bow-shaped elastic frame body having the supporting and extending surface is provided with the chordal band piece composed of the upper band and the lower band. By adjusting the connecting length of the, the entire frame body part including the support extension surface part can be drawn and bent like a bow, and the curved curvature of the bow frame-shaped elastic frame part can be adjusted. The curved bulging surface of the bow-shaped elastic frame body portion can be adjusted according to the sitting height of the person, and the bearing extension surface portion can correspond to the back surface in the correct sitting posture.
Therefore, it is possible to cope with occupants having various sitting heights, and the occupant can maintain a natural and comfortable sitting posture, and a comfortable sitting comfort can be obtained. In addition, since the bow shape can be adjusted with a pair of chordal band pieces consisting of the upper and lower bands, even if the elastic bearing surface loses elastic repulsion due to many years of use, the bow frame elastic frame body The elastic repulsive force can be revived by squeezing the part in a bow shape, which has the excellent effect of achieving the object of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which an example seat backrest is mounted on a seat.

FIG. 2 is a plan view showing an example seat backrest.

FIG. 3 is a side view showing an example seat backrest.

FIG. 4 is a partially enlarged sectional view showing a main part of the seat backrest according to the embodiment.

[Explanation of symbols]

 1 Bow frame-shaped elastic frame part 2 Support extension surface part 3 String-shaped band piece 4 Seat attachment part

Claims (1)

[Scope of utility model registration request] 1. A bow-frame-shaped elastic frame body part which is gradually and largely bulged forward in a forward direction from an upper side part to a lower side part, and the bow-framed elastic frame part is stretched to have a proper sitting posture. A support stretched surface portion that holds the back surface, a chordal band piece vertically arranged on the back surface side of the bow frame-shaped elastic frame body portion, and a back surface side of the bow frame-shaped elastic frame body portion, and A seat backrest consisting of a seat mounting portion arranged orthogonally to the outside of a chordal band piece, wherein the chordal band piece has a base end portion of an upper side portion of an arch frame-shaped elastic frame body portion. The lower band consists of an upper band that is fastened to the back side and has a buckle with a stopper at the tip, and a lower band that is fastened to the back side of the lower side of the bow-frame elastic frame body at the base end. By inserting the tip of the into the buckle with a stopper and fixing it, the length of the upper and lower bands can be adjusted and the bow frame A backrest for a seat, characterized in that the curved curvature of the flexible frame body is variable.