JPH0824072A - Spring structure of seat back for vehicle - Google Patents

Abstract

PURPOSE:To make it possible to improve the body pressure distribution of the pelvis and the lumbar vertebra and to improve the final posture. CONSTITUTION:This spring structure is provided with upper and lower S springs 30, 35 which support the prescribed vertebra spondyl part of the dorsal spondyl and the prescribed spondyl part of the lumbar spondyl or the upper and lower spondyl parts of the lumbar spondyl of the upper half body of the human body between right and left vertical frames 24 of a seat back frame 21 and is provided with a perpendicular supporting part 32 in the central part between these upper and lower springs S in such a manner that the spinal cord is supported straight. The spring structure is so constituted that the spinal cord is stably held by the lower S spring 35 having approximately an inverted T shape and the perpendicular supporting part 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat back, and more particularly to a seat back spring structure.

[0002]

2. Description of the Related Art Conventionally, as a spring structure of a seat back 1 of a vehicle seat S of this type, in order to improve vibration absorption during traveling of the vehicle and distribution of body pressure of a human body during sitting, for example, FIG. As shown, the outer peripheral frame 3 of the seat back frame 2 is formed by bending a pipe material and is formed into a substantially rectangular frame body by the upper frame 4, the left and right vertical frames 5, and the lower frame 6. Brackets 7 of headrests are attached at predetermined intervals, and between the left and right vertical frames 5, piano wires with a predetermined diameter, or S springs 8a, 8b formed by bending hard steel wires at equal pitches are formed. 8c are mounted at a predetermined interval to balance tension.

The S springs 8a, 8b and 8c are attached to the left and right vertical frames 5 at predetermined intervals a as shown in FIG. 9 (a).
Engage with the engaging members 9 attached corresponding to 1, a2, a3, or as shown in Fig. (B), pierce the left and right vertical frames 5 at predetermined intervals corresponding to the positions a1, a2, a3. It is engaged with and attached to the engaged hole 10 formed. Further, in order to improve the tension balance of each S spring 8a, 8b, 8c, S
The sub wires 11 are connected to the springs 8a, 8b and 8c at predetermined intervals in the vertical direction by clips 12 as shown in FIG. A seat back pad is wrapped around the seat back frame 2 formed in this way, and
Further, the skin material is covered to form the seat back 1.

[0004]

However, this conventional spring structure for the seat back frame 2 requires a plurality of clips 12 for attaching the sub-wires 11 in order to improve the tension balance of the S springs 8a, 8b, 8c. As a result, the number of parts increases, and man-hours for parts management are required.
Further, it requires a lot of man-hours for mounting, and there are problems in terms of cost and weight. In addition, the S springs 8a, 8b, 8 of equal pitch
Since c is attached to the positions a1, a2, a3, there is a problem in the body pressure distribution, particularly in the pelvis and the lumbar vertebrae. The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to eliminate the sub-wire 11 and keep the number of clips 12 to a minimum number, and in particular, improve the body pressure distribution in the pelvis and the lumbar spine. An object of the present invention is to provide a seat back spring structure capable of improving the final posture.

[0005]

In order to solve the above technical problems, the present invention provides a spring structure for supporting the upper half of the human body by engaging between the left and right vertical frames of a seat back frame of a vehicle seat, Between the left and right vertical frames of the seat back frame, upper and lower S springs that horizontally support a predetermined vertebral portion of the thoracic vertebra and a predetermined vertebral portion of the lumbar vertebra or upper and lower vertebral portions of the lumbar vertebra. And this S above and below
A vertical support portion is provided in the central portion between the springs so as to support the spinal cord straightly, and the spinal cord can be stably held by the substantially inverted T-shaped lower S spring and the vertical support portion. The upper S spring engaged between the left and right vertical frames of the seat back frame is an inclined S-shaped downwardly inclined S spring portion having a substantially S shape at a predetermined pitch from the left and right engaging ends toward the center of the frame. The left and right downwardly inclined S springs are vertically supported from the ends thereof in a substantially U shape, and the lower S spring is formed in a substantially S shape at a predetermined pitch, and the vertical support portion is provided at the center. The S springs engaged with the left and right vertical frames of the seat back frame are substantially S-shaped at a predetermined pitch toward the center of the frame. Horizontal upper and lower S springs and ends of the upper and lower S springs A vertical spring portion provided between and a pair of left and right S springs formed in a substantially U shape. The left and right vertical spring portions are clip-connected at a predetermined interval in the center of the frame. It is a seat back spring structure.

[0006]

With the above-mentioned structure, the lumbar vertebra is supported in a substantially inverted T shape by the lower S spring and the vertical support portion, which have a substantially inverted T shape, so that the position of the pelvis can be stably determined and the spinal cord can be determined. Is supported straight, and is supported in a comfortable final position, and the body pressure distribution is also good.

[0007]

1 is a front view of a seat back frame 21, FIG. 2 is a perspective view of the seat back frame 21, and FIG. 3 is an X-axis of FIG. An X-ray sectional view is shown, in which the seat back frame 21 includes an outer peripheral frame 22 and S springs 30, 35.
The outer peripheral frame 22 is formed into a substantially rectangular frame body by the upper frame 23, the left and right vertical frames 24, and the lower frame 25 as in the conventional case, and the upper frame 23 is formed at predetermined intervals. A headrest bracket 26 is attached. Further, on the left and right vertical frames 24 of the outer peripheral frame 22, for example, engaging holes 27a of the S spring 30 are provided so as to correspond to a position A1 for supporting a predetermined portion of the thoracic vertebra, and for example, a predetermined vertebra of the lumbar vertebra. S spring 3 corresponding to position A2 supporting the part
The engagement holes 27b of No. 5 penetrate, and the S springs 30 and 35 are engaged with the positions A1 and A2, respectively.

The S springs 30 and 35 are formed by bending a piano wire having a predetermined diameter or a hard steel wire at an equal pitch, as in the conventional case, and the S spring 30 hooked at this position A1.
As shown in the drawing, a downwardly inclined S spring portion 31 is formed which is bent downward from the left and right engaging ends 30a toward the central portion in an inclined manner at a prescribed angle and in an S shape at a prescribed pitch. Down S
The inner end of the spring portion 31 is formed in a substantially U-shape downward at a predetermined distance t at a central portion thereof with a predetermined length to form a vertical support portion 32.

Further, the S spring 35 is formed into an S shape by bending at a predetermined pitch almost like the conventional S spring 8 and has a vertical support portion hanging from the upper S spring 30 at the center thereof. A slightly wider U that connects to the lower end of 32 in an overlapping manner
A letter-shaped connection receiving portion 36 is formed.

The engaging ends 30a and 35a of the S springs 30 and 35 thus formed have engaging holes 27a and 27, respectively.
While being engaged with b, the ends of the vertical support portions 32 of the upper S springs 30 are fitted into the connection receiving portions 36 of the lower S springs 35 so that the wire rods are overlapped with each other and fixed by the clips 37. The base side of the vertical support portion 32 of the upper S spring 30 is also connected by a clip 38 so as to maintain a substantially U-shaped space. Thus, the upper and lower S springs 30, 35
A seat back pad is attached to the outer peripheral frame 23 to which is attached to cover the skin material to form a seat back, and a seat back is formed via an arm bracket 39 to a reclining adjuster attached to the seat cushion side. Has been done.

When an occupant sits on the seat thus formed and leans back on the seat back, the S spring 30 at the upper portion of the seat back frame 21 obliquely supports the thoracic vertebrae of the upper half of the body and at the lower portion. The S spring 35 horizontally supports a predetermined vertebral portion of the lumbar vertebra, and in particular, the lower S spring 35 and the vertical support portion 32 of the upper S spring 30 form a substantially inverted T shape. The vertical support portion 32 supports vertically along the spinal cord. Therefore, since the load of the upper body is applied to the lumbar region, the lower S spring 35
The vertical support portion 32 of the upper S spring 30 determines the position of the pelvis in a stable manner, and supports the lumbar portion in a substantially inverted T shape, so that the spinal cord is supported straight and supported in a comfortable final posture. The body pressure distribution is improved, and the movement of the back muscles of the occupant is reduced, so that fatigue such as stiff shoulders and low back pain can be reduced.

Further, since the seat back frame 21 of this embodiment is configured to be supported at two points by the upper and lower S springs 30 and 35, one can be omitted from the conventional three S springs 8a, 8b and 8c. Further, since the sub wire 11 can be omitted and the number of clips can be reduced, the number of steps for assembling the seat back frame 21 can be reduced, the cost can be reduced, and the weight can be reduced. It also helps consumption.

Next, FIG. 4 shows another embodiment of the seat back frame 21, which is a seat back frame 41.
In, the shape is different from that of the S springs 30 and 35, and the outer peripheral frame 22 has the same configuration. This is because the S springs 42 and 43 engaged with the outer peripheral frame 22 are formed in a symmetrical shape, and the engaging end portion 44a is engaged with the engaging hole 27 at the position A1 of the outer peripheral frame 22 so that the central portion side of the frame 22 is closed. An upper S spring portion 44 that is bent in an S-shape at a predetermined pitch so as to face each other, and a vertical spring portion 45 that extends downward from the end portion of the upper S spring portion 44 by a predetermined length. The lower S spring portion is bent from the lower end of the vertical spring portion 45 into an S shape at a predetermined pitch corresponding to the upper S spring portion 44, and the engaging end portion 46a is engaged with the engaging hole 27b at the position A2. And 46 form a substantially U-shape.

The S springs 42 and 43 formed in this manner have the engaging end portions 44a and 46 of the upper and lower S spring portions 44 and 46, respectively.
Since a is engaged with the engagement holes 27a and 27b at the positions A1 and A2, the vertical spring portions 45 have a predetermined distance t, and the upper and lower portions of the left and right vertical spring portions 45 have a distance t. Are connected by a clip 47.

Therefore, this seat back frame 4
In the left and right S springs 42 and 43 engaged with 1, the left and right upper S spring portions 42 horizontally support the upper thoracic vertebrae, and the left and right lower S spring portions 46 are predetermined vertebrae of the lumbar vertebrae. The portion is supported horizontally, and the left and right lower S spring portions 46 and the left and right vertical spring portions 45 form a substantially inverted T-shape, and the left and right vertical spring portions 45 extend vertically along the spinal cord. To support. Therefore, since the load of the upper half of the body is applied to the lumbar vertebra, the left and right lower S spring portions 46 and the left and right vertical spring portions 45 stably determine the position of the pelvis, and the lumbar vertebra portion is substantially inverted T-shaped. Since the spinal cord is supported straight, the body is supported in a comfortable final position and the body pressure distribution is good, and the movement of the back muscles of the occupant is small, and fatigue such as stiff shoulders and low back pain can be reduced. The same operational effects as those of the above embodiment are obtained.

In each of the above embodiments, the thoracic vertebra part and the lumbar vertebra part are illustrated as being supported horizontally at two points, but they are configured as shown in FIG. Good. The outer peripheral frame 52 of the seat back frame 51 has an upper frame (not shown) and left and right vertical frames 5 as in the above.
3 and the lower frame 54 are formed in a substantially rectangular shape. On the lower side of the left and right vertical frames 54, for example, S corresponding to the positions B1 and B2 of the intervals for supporting the upper and lower parts of the lumbar vertebra part of the human body. Engagement holes 56a and 56b of the springs 57 and 60 are provided so that S springs 57 and 60 are engaged with the positions B1 and B2, respectively.

The S spring 57 is formed by shortening the vertical support portion 32 of the S spring 30 described above.
Reference numeral 7 denotes a downwardly inclined S spring portion 58 that is bent downward from the left and right engaging ends 57a toward the central portion in an S-shaped manner at a prescribed angle and at a prescribed pitch. Spring part 58
The inner end of each is formed in a substantially U shape with a predetermined length downward at a central portion thereof at a predetermined interval t to form a vertical support portion 59.

Further, the S spring 60 is formed into an S-shape by bending at a predetermined pitch in the same manner as the S spring 35 described above, and has a vertical support portion suspended from the upper S spring 57 at the center thereof. Slightly wide U that is connected to the lower end of 58 in an overlapping manner
A letter-shaped connection receiving portion 61 is formed.

The engaging ends 57a and 60a of the S springs 57 and 60 thus formed are engaged with the engaging holes 56a and 56b at the positions B1 and B2, respectively, and the vertical supporting portion 59 of the upper S spring 57 is supported. The end portion is fitted into the connection receiving portion 61 of the lower S spring 60, and the wire rods are overlapped with each other to form the clip 3
It is fastened by 7.

Therefore, this seat back frame 5
In No. 1, since the upper and lower parts of the lumbar vertebrae are supported horizontally and the lumbar vertebrae are supported straight by the vertical support portion 59, the lumbar vertebra is not in a dorsal posture, and the same operational effect as that of the above embodiment is obtained. It plays.

Further, the seat back frame 6 shown in FIG.
5 is the positions B1 and B2 of the seat back frame 51 described above
The S springs 66 and 67 are engaged with the engagement holes 56a and 56b of the S to support the upper and lower sides of the lumbar vertebrae.
The vertical spring portion 45 of the above S springs 42 and 43 is formed to be short, and the upper S spring portion 68 and the vertical spring portion 6 are
9a and 69b and the lower S spring portion 70 are formed into a substantially U-shape, and a part of the upper and lower S spring portions 68 and 70 are overlapped with each other so that the vertical spring portions 69a and 69b are interchanged left and right. Are fixed to each other by a clip 38 and are connected at a predetermined interval t. Therefore, also in this frame 65, upper and lower parts of the lumbar vertebrae are horizontally supported by the upper and lower S spring portions 68, 70 of each other in the same manner as described above, and the lumbar vertebrae portions are supported by the mutual vertical spring portions 69a, 69b. Since it supports straightly, it does not have a back posture. The vertical spring portions 69a and 69b are left and right interchanged to prevent the entanglement.

The position A where the above S springs engage with each other
The distance between 1, A2 and positions B1, B2 is selected according to the usual mounting angle of the seat back frame, the shape of the seat back, and the like.

[0023]

Since the present invention is configured as described above, the vertical support portions of the lower S spring and the upper S spring are formed in a substantially inverted T shape, and the vertical support portions are spinal cords. Support vertically along. Therefore, since the load of the upper half of the body is applied to the lumbar vertebra, the lower S spring and the vertical support stably determine the position of the pelvis and support the lumbar vertebra in a substantially inverted T-shape. It is supported straightly, is supported in a comfortable final posture, and has a good body pressure distribution. Further, the movement of the back muscles of the occupant is reduced, and fatigue such as stiff shoulders and low back pain can be reduced. Further, since the seat back frame is configured to be supported by the upper and lower S springs at two points, one can be omitted from the conventional S spring, and further, the sub wire can be omitted to reduce the number of clips. In addition, the number of steps for assembling the seat back frame can be reduced, the cost can be reduced, and the weight can be reduced, which also contributes to fuel consumption.

[Brief description of drawings]

FIG. 1 is a front view of a seat back frame.

FIG. 2 is a perspective view of a seat back frame.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is a front view of a seat back frame showing another aspect of the S spring.

FIG. 5 is a front view of the seat back frame showing another mounting mode of the S spring.

FIG. 6 is a front view of the seat back frame showing another mounting mode of the S spring.

FIG. 7 is a perspective view of a seat.

FIG. 8 is a perspective view of an S spring assembly of a conventional seat back frame.

9 (a) and 9 (b) are cross-sectional views of the engaging end portion of a conventional S spring.

FIG. 10 is a perspective view of another S spring assembly of the conventional seat back frame.

[Explanation of reference signs] 21, 41, 51, 65 seat frame 24, 54 vertical frame 30, 35, 42, 43, 57, 60, 66, 67 S
Spring 31,58 Downward S spring 32,59 Vertical support part 36,61 Connection receiving part 37,38,47 Clip 44,68 Upper S spring part 45,69a, 69b Vertical spring part 46,70 Lower S spring part

Claims (3)

[Claims] 1. A spring structure for supporting an upper half of a human body by engaging between left and right vertical frames of a seat back frame of a vehicle seat, wherein the upper half of the human body is provided between the left and right vertical frames of the seat back frame. The upper and lower S springs that horizontally support the predetermined vertebral portion of the thoracic vertebra and the predetermined vertebral portion of the lumbar vertebra, or the upper and lower vertebral portions of the lumbar vertebra, and the spinal cord straight in the center between the upper and lower S springs. A seat back spring structure for a vehicle, in which a vertical support portion is provided so as to be able to support, and a spinal cord can be stably held by a substantially inverted T-shaped lower S spring and the vertical support portion. 2. An upper S spring engaged between the left and right vertical frames of the seat back frame is tilted downward in a substantially S shape at a predetermined pitch from the left and right engaging ends toward the center of the frame. It is composed of an S spring portion and a vertical support portion that hangs down from the ends of the left and right downwardly inclined S springs into a substantially U shape.
2. The spring structure for a vehicle seat back according to claim 1, wherein the springs are formed in a substantially S-shape at a predetermined pitch, and a connection receiving portion of the vertical support portion is provided in a central portion for clip connection. 3. The S springs that are engaged with the left and right vertical frames of the seat back frame are substantially S-shaped horizontal upper and lower S spring portions at a predetermined pitch toward the center of the frame, and the upper and lower S springs. A pair of left and right S springs formed in a substantially U shape by a vertical spring portion provided between the end portions of the portion,
2. The spring structure for a vehicle seat back according to claim 1, wherein the left and right vertical spring portions are clip-connected at predetermined intervals in a central portion of the frame.