JPH07308233A - Shape of seat back - Google Patents

Abstract

PURPOSE:To eliminate friction between the surface of a seat back and both of a sitting person's shoulder blades, and lessen fatigue by forming the seat back so as to set back the surface behind the shoulder blades from the surface supporting a body between the blades. CONSTITUTION:A seat 1 consists of a seat cushion 2 as seat surface, a seat back 3 formed behind the cushion 2 for supporting a back and a headrest 4 for supporting a head. Also, the seat back 3 is made of sections 3a, 3b and 3c forming the upper section of the seat back 3 for supporting a sitting person on the back of his/her shoulder blades, a section 3d forming the lower section of the seat back 3 for supporting the person on the back of his/her lumbar, and sideboard sections 3e and 3f. In this case, both shoulder blade escape sections 3b and 3c are formed, so as to be set back from the section 3a. As a result, the sitting person is supported with the section 3b. Also, the section of both shoulder blades is off the surface of the seat back 3. According to this construction, the person's fatigue can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat or the like, and more particularly to a seat back shape for reducing fatigue.

[0002]

2. Description of the Related Art A conventional general seat is formed as shown in the perspective view of FIG. 4, in which a seat 11 is a seat cushion 12 and a seat back formed behind the seat cushion 12 for supporting the back. 13 and a headrest 14 for supporting the head.

The seat back 13 which is the object of the present invention in the construction of the seat 11 is roughly classified into a scapula support portion 13a for supporting the back of the scapula of the seated person and a lumbar support portion for supporting the back of the lumbar spine. 13b, and three side support parts 13c and 13d for restricting the right and left swing of the body.

In the structure of the seat back 13 described above, the surface shape of the scapula support portion 13a related to the present invention is formed to be substantially flat in the vertical direction, and the seat back 13 is curved backward at the upper portion thereof. Is formed so as to be continuous with the upper surface of the above, and is connected to the lumbar support 13b at the lower part. In the horizontal direction, the central part is formed to be substantially flat, and the left and right side support parts 13c and 13d are formed.
It is formed so as to curve slightly forward (on the seating side) as it gets closer to the side support parts 13c and 13d. Scapula support 13a for seat cushion 12
The surface angle is set so as to be slightly more raised than the surface angle of the lumbar spine support portion 13b so that the posture above the chest approaches vertically.

The conventional scapula supporting portion 13a formed as described above has the following drawbacks in view of the influence on the sitting posture. FIG. 5 shows a state in which the seated person leans against the seat back 13, and is a YY end view in FIG. 4, showing a horizontal cross section at the position of the shoulder blade of the seated person. The alternate long and short dash line M in the figure indicates the contour of the seated person. In the same figure, since both scapula M1 and M2 of the seated person project posterior to the space between both scapula M3, the portions of both scapula M1 and M2 contact and are supported by the scapula support portion 13a. As a result, the movement of both shoulder blades M1 and M2 is obstructed by friction with the shoulder blade support portion 13a, and the freedom of movement of the arm is lost, which causes a feeling of restraint and fatigue.

Further, as shown in FIG. 5, both shoulder blades M1, M2
If the support force continues to act on the shoulders, M3 between the shoulder blades
It was easy for the back M4 to retreat and the entire surface of the back M4 to come into contact with the scapula support 13a as shown in FIG. The state is
Since the central part M5 of the chest is recessed by retracting from the state shown in FIG. 5, the lungs are in a bad posture in which they are compressed.

On the other hand, the scapula supporting portion 13a has the following drawbacks when viewed from the longitudinal center cross section of the seat back 13. In Figure 7, the seated person is seatback 13
4 shows a state of leaning on the seat, and is a longitudinal center end view of the seat 11 in FIG. 4, showing a cross section along the spine of the seated person. The alternate long and short dash line M in the figure indicates the contour of the seated person. In the figure, since the scapula supporting portion 13a supports the portion of the scapula M2 of the seated person which is protruding rearward, the portion of the thoracic vertebra M6 between both scapulas is separated from the scapular supporting portion 13a. Is in a state. Therefore, the thoracic vertebra M6 is in an unstable state in which its position changes due to the movement of both shoulder blades. The weight of the upper body of the seated person is supported by the spinal column, but if the support state of the thoracic vertebra M6 that constitutes the upper part of the occupant is unstable, the spinal column tends to bend, which causes the posture of the lower lumbar spine M8 to change. It also affected and caused the back pain as described below.

As shown in FIG. 7, a morphological gap is likely to occur behind the thoracic vertebra M6 located below the scapula M2,
The part of the thoracic vertebra M6 retreats and is easily bent. FIG. 8 shows the bent state, in which the part of the thoracic vertebra M7 corresponding to the lower part of the thoracic vertebra M6 is retracted and the seat back 1 is moved.
3 shows a state of being supported by No. 3. When the portion of the thoracic vertebra M7 begins to bend, a buckling force is generated due to the weight applied to the portion, and the buckling force further presses the seatback 13 surface to retreat to increase the bending. The bend affects the lumbar vertebra M8, and the lumbar vertebra M8 is bent in the direction opposite to the ideal direction, which increases the load on the lumbar vertebra M8. In addition, when the buckling force is generated, the supporting force of the buckling force also increases, so that the lumbar region moves forward and the lumbar vertebra M8 is further bent.

In addition, in FIG. 8, when the thoracic vertebra M7 is retracted, the stomach M9 is depressed and pressed, and there is a drawback that it feels painful.

As described above, the conventional seat back 13 is
Since the seated person has a shape that supports the protruding portions of both shoulder blades M1 and M2, it is not possible to achieve an ideal posture.

[0011]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional drawbacks by improving the shape of the seat back and to provide a comfortable seat with less fatigue.

[0012]

As shown in FIG. 1, in a seat 1 in which a seat back 3 is formed at least behind both shoulder blades of a seated person, a seat for supporting a space between the shoulder blades of the seated person. The scapula escape portions 3b and 3c are formed by retracting and forming the seat back 3 surface located behind both shoulder blades from the interscapular support portion 3a on the back 3 surface.
Is used as a means.

[0013]

FIG. 2 shows a state in which the seated person leans against the seat back 3, and is an end view taken along line XX in FIG. 1, showing a horizontal cross section at the position of the seated person's scapula.
The alternate long and short dash line M in the figure indicates the contour of the seated person. In the figure, since both scapula relief parts 3b and 3c are formed to be retracted from the interscapular support part 3a, the seated person is supported by the interscapular support part 3a, and both shoulder blades M1 and M2 are supported.
The part is separated from the seat back 3 surface.
Therefore, there is no friction between the shoulder blades M1 and M2 and the seat back 3 surface, the arm can be moved lightly, and fatigue can be reduced. Further, when the space between the scapulas is supported, a retracting force acts on both scapulas M1 and M2, so that the chest can be widened and a comfortable posture can be obtained.

On the other hand, FIG. 3 is a longitudinal center end view of the seat 1 in FIG. 1 and shows a cross section along the spine of a seated person.
The alternate long and short dash line M in the figure indicates the contour of the seated person. In the figure, since the interscapular support part 3a directly supports the part of the thoracic spine M6, the spinal column can be stabilized in a predetermined shape unlike the conventional case. Therefore, buckling of the spinal column is less likely to occur, and back pain and fatigue can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the present invention is carried out by directly following the conventional structure, material and manufacturing technique of the seat, and the present invention achieves the object by changing the shape.

A seat 1 according to the present invention is formed as shown in the perspective view of FIG. 1. The seat 1 is a seat cushion 2 which serves as a seat surface, a seat back 3 formed behind the seat cushion 2 and a head for supporting the back. Headrest 4 for supporting
It consists of The structure of the seat back 3 to which the present invention is applied is broadly divided into parts (3a, 3b, 3c) that form the upper part of the seat back 3 and support the position behind the scapula of the seated person. And a portion that forms the lower part of the seat back 3 and supports the position behind the lumbar spine (3
d)) and side support parts (3e, 3f) formed on both sides of the two parts to limit the lateral sway of the body.
It is divided into three). Among them, the present invention is a part (3a, 3b, 3) that supports the position behind the scapula of the seated person.
It relates to the shape of c).

In this embodiment, the scapula relief portion is formed by retreating the seat back 3 surface located behind both scapulas from the interscapular support portion 3a supporting the scapula between the seated person. 3b and 3c are formed. The purpose is to reduce or eliminate the supporting force applied to both scapulas by letting out the protrusions of both scapulas in the scapula relief parts 3b and 3c.

The interscapular support part 3a is a lumbar support part 3d.
Is formed so as to be continuous in plane, and both are supported so that the spine of a seated person has a predetermined posture. Seat back 3
A two-dot chain line S shown in the center of the figure indicates the surface shape. The shape will be described with reference to FIG. 3. There are curved peaks at the portion supporting the position behind the pelvis shown by the symbol P1 and the portion supporting the position behind the stomach shown by the symbol P2.
The constituent surface between the two forms a receding curved surface, and the receding amount is about 5 to 15 mm. The interscapular support portion 3a also forms a slightly receding curved surface, and the receding amount is represented by the symbol P1.
Is about 2 to 7 mm as measured from the extension of the straight line connecting the vertices indicated by the symbol P2. The interscapular support part 3a is connected to the surface indicated by the symbol P2 in the lower part thereof, and in the upper part, in order to raise and support the upper half of the body slightly, measure from an extension line of a straight line connecting the vertices indicated by the symbols P1 and P2. The position is set to be about 5 to 15 mm on the seating side.

Since the upper part of the shoulder blades is narrow and the lower part of the shoulder blades is wide, the width of the interscapular support portion 3a is accordingly 10 to 10.
It will be about 14 cm. It is appropriate that the step between the interscapular support part 3a and the scapula relief parts 3b and 3c is about 1 to 3 cm.
The step shown in FIG. 2 shows an example of a size in which a gap is formed behind both shoulder blades M1 and M2, but the supporting force applied to both shoulder blades M1 and M2 can be reduced even if there is no gap. However, some of the objects of the present invention can be achieved. The step is formed by molding a sponge which is a cushioning material inside the seat back 3, and the surface thereof is covered with a covering material such as woven fabric or leather. It is necessary to consider the hardness of the sponge and the installation of a support plate so that the sponge will not be crushed and the step will not disappear when a supporting force acts on the interscapular support part 3a.

[0020]

The present invention reduces or eliminates the supporting force applied to both shoulder blades by supporting the space between the shoulder blades of the seated person, so that there is no friction between the three seat backs and both shoulder blades and the arm can be moved lightly. I became less tired.
In addition, when the space between the scapula is supported, a retreating force acts on both scapula M1 and M2 as shown in FIG. 2, so that the chest is naturally widened and a comfortable posture is achieved.

Further, as shown in FIG. 3, the interscapular support portion 3
Since a directly supports the portion of the thoracic vertebra M6, no space is formed behind the thoracic vertebra M6, and the spinal column can be stably supported in a predetermined shape. As a result, the buckling of the spinal column was less likely to occur, and back pain and fatigue could be reduced. In addition, the pressure on the stomach due to the bending of the spinal column disappeared, and a comfortable posture was achieved.

As described above, according to the present invention, not only the physical improvement such as the reduction of fatigue around the shoulder and the reduction of low back pain, but also
There are great sensory improvements such as freedom of movement of arms, easy breathing, and pleasant digestive organs, and the benefits of this invention in the future will be long-term.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat showing an embodiment of the present invention.

2 is a XX end view shown in FIG. 1, showing a horizontal cross section at the position of the scapula of a seated person.

3 is a longitudinal center end view of the seat 1 in FIG. 1, showing a cross section along the spine of a seated person.

FIG. 4 is a perspective view showing a conventional seat.

5 is a YY end view shown in FIG. 4, showing a horizontal section at the position of the scapula of a seated person.

FIG. 6 is a YY end view shown in FIG. 4, showing a horizontal cross section at the position of the scapula of a seated person.

7 is a longitudinal center end view of the seat 11 in FIG. 4, showing a cross-section along the spine of a seated person.

8 is a longitudinal center end view of the seat 11 in FIG. 4, showing a cross section along the spine of a seated person.

[Explanation of symbols]

 1 seat 2 seat cushion 3 seat back 3a interscapular support part 3b shoulder blade relief part 3c shoulder blade relief part

Claims (1)

[Claims] 1. A seat in which a seat back is formed at least behind both shoulder blades of a seated person, and the shoulder blades of the seat back surface supporting the space between the shoulder blades of the seated person rather than the interscapular support portion. The seat back surface located behind is formed by retreating to form a scapula relief part, and the protrusions of both scapulas are released in the scapula relief part to reduce or eliminate the supporting force applied to both scapulas. The shape of the seat back characterized by.