JP2001269241A - Cushion pad for seat - Google Patents

Abstract

(57) [Summary] [Problem] To reduce the hardness of a portion where a thigh is placed,
A cushion pad for a seat that achieves both good fatigue reduction function and light operability at low cost and with excellent productivity. SOLUTION: In the seat cushion pad A,
On the left and right sides of the leg portion 3 for receiving and supporting the thigh in the seating portion 1, slits 4, 6 having a predetermined depth are formed along the thigh longitudinal direction and have a predetermined depth.
The rear end portions 6 are connected to each other by horizontal slits 7 facing left and right.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion pad for a seat mounted on a vehicle such as an automobile, and more particularly, to a technique for improving ride comfort and operability by foot.

[0002]

2. Description of the Related Art Functions required for vehicle seats include (1) minimizing fatigue of drivers and passengers, (2) safe and comfortable tactile support for the human body, (3) Of the vehicle body components, those components that account for a large proportion of the cost and have an economical structure; (4)
Since it occupies a large portion of the cabin space, there are various things such as being satisfactory in design and (5) having a shape and dimensions that allow the planned seating capacity to be satisfied.

Therefore, the cushion pad that determines the original shape of the seat has, as functions related to the above (1) to (5), (i) to give a good seating posture and pressure distribution to a seated human body, and (ii) economy. It must be designed and manufactured. Also, especially for drivers,
(Iii) It is required that various actions of the seated human body can be easily performed, and (iv) a structure having sufficient strength and rigidity as a structure which receives a reaction force of the various actions is required.

For example, by devising a cushion pad for a seat to prevent numbness due to compression of the thigh when riding for a long time, or to prevent hindrance to operation of clutch work or the like, a thigh is required. It is known that it is effective to make the front edge of the cushion pad, which is the portion that receives and supports the portion, softer than the other portions. As means for that, a) a different hardness means (soft blending) using a material having a relatively low hardness partially,
b) There is a means for partially bonding or integrally foaming a relatively low hardness slab material.

[0005]

As shown in FIG. 10, the above-mentioned means a) injects a plurality of high- and low-hardness stock solutions into predetermined positions of a pad mold (not shown) separately as shown in FIG. By doing so, the cushion pads A having different hardnesses, that is, the soft leg seat portion 3 and the hard butt seat portion 2 are integrally formed (soft blending means).

The means (b) has, for example, as shown in FIG. 11, a seating portion 1 formed by bonding a low-hardness partial pad 15 to a separately formed high-hardness main pad 14. It is a component of the cushion pad A (soft slab means).

However, in the method (a), two or more kinds of stock solutions are required at the time of mold injection, and additional capital investment by adding a raw material storage tank, an injection head, and a control device is required. In the method (b), post-processing is required and the number of steps is increased, and labor costs are required to set the slab. Therefore, there is a tendency that the cost is increased or the productivity is reduced. There was room left.

An object of the present invention is to reduce the hardness of a portion on which a thigh is placed so as to reduce the cost of a cushion pad for a seat that achieves both good fatigue reduction and light operability. The present invention is to be realized with advantages such as improvement of productivity system.

[0009]

Means for Solving the Problems [Structure] The structure of claim 1 is as shown in FIG.
In the left and right sides of the leg portion 3 for receiving and supporting the thigh in the seating portion 1, along the thigh longitudinal direction, and
The slits 4, 6 having a predetermined depth are formed.

Referring to FIG. 1, the seat cushion includes a tail seat portion 2 and a leg seat portion 3. Normally, the seat seat portion 2 is located on the rear side of the vehicle and the leg seat portion 3 is located on the front side of the vehicle. Be attached.

The structure of claim 2 is as shown in FIG.
In the configuration of the first aspect, the rear ends of the pair of slits 4 and 6 (rear end portions when the vehicle is mounted) are connected to each other by horizontal slits 7 facing left and right.

According to a third aspect of the present invention, as shown in FIG.
In the configuration of claim 2, the lateral slit 7 is formed at or near a boundary between the buttocks 2 for receiving and supporting the buttocks in the seating portion 1 and the legs 3. .

The structure of claim 4 is as shown in FIG.
The left and right lateral sides of the seating portion 1 having the buttocks 2 for receiving and supporting the buttocks and the leg portions 3 for receiving and supporting the thighs are received so that the lateral movement of the occupant can be regulated. In the cushion pad for a seat provided with the supporting lateral frame portions 5, slits 8 along the thigh longitudinal direction are formed at positions corresponding to the leg portions 3 in the front-rear direction on the upper surface 5a of each lateral frame portion 5, 5. It is characterized by having done.

As described above, the reference numerals are used for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

According to the first aspect of the present invention, the left and right sides of the leg portion, which is located at the front end of the seat portion,
Since a slit of a predetermined depth is formed along the longitudinal direction of the thigh, at least the left and right edges and the front edge are in a state close to the free end, as if they were close to an island floating from the seat. The spring constant in the left-right and up-down directions as the cushion pad is reduced as compared with the case where the surface state is continuous with the seating portion. In other words, (a) the leg portion is softer than the other portions, and a cushion state suitable for the thigh, which is better supported lightly than the buttocks, is obtained. Can be easily moved to the left and right, the legs can be easily relaxed, and the operation of the legs such as the clutch and the brake pedal can be easily performed.

Since the slit can be formed at the time of molding, it can be manufactured by injecting only a pad material for forming a relatively hard tail portion into the mold. There is no need to perform the work of aligning and injecting two types of polyurethane foam stock solution into the mold, or bonding a separately prepared low-hardness pad material to a high-hardness pad material, thereby simplifying the manufacturing process.

According to the second aspect of the present invention, since the left and right sides and the rear side of the leg portion located at the front end of the seating portion are formed with continuous slits, the left and right edges and the front and rear edges are formed. The leg seat part, which is in a state close to the free end in all four directions, is closer to the island floating from the seating part, compared to the case where it is a surface state continuous with the seating part, left and right and up and down as a cushion pad Since the spring constant of (1) is clearly reduced, the effect of (1) is strengthened.

According to the third aspect of the present invention, the horizontal slit is formed by:
A butt seat that receives and supports the buttocks that hardly moves when seated, and a leg seat that receives the thighs that are relatively likely to move when seated, such as swinging left and right or raising and lowering Because it is formed at or near the boundary, for example, when the legs are moved, only the leg seats are correspondingly rolled or bent, and the buttocks are not moved, so the fixed state is The desired buttocks portion and the orbiting legs that are desirably movable can be provided with the functions required for each, and can be brought into a state in which they are less likely to affect each other.

According to the configuration of the fourth aspect, the following operation is provided. Many cushion pads for seats are provided with horizontal frame sections that receive and support the lateral movement of the occupant so that they can be restrained from moving laterally to improve the holdability of the sitting posture and improve stability. It has become to. Therefore, a slit is formed along the longitudinal direction of the thigh at a position corresponding to the leg seat portion in the front-rear direction on the upper surface of the horizontal frame to lower the spring constant in the left-right direction. The feeling of contact with the frame becomes soft, and it is easy to move the legs to the left and right while maintaining the above-mentioned holdability and stability, and it is possible to obtain effects such as being less tired even if the legs are placed on the horizontal frame for a long time. it can. In addition, since the slit, which is a means for that, can be integrally formed at the time of molding, no additional work such as preparation of a component dedicated to the slit or processing as a separate step is required.

[Effect] In the cushion pad for a seat according to any one of the first to third aspects, a mold can be easily formed by using a single kind of pad material by devising slits on the right and left sides of the leg portion. It is possible to realize a relatively hard buttocks portion suitable for supporting the buttocks and a relatively soft leg portion which is suitable for supporting the thighs, and (b) economically and rationally with good productivity. Both good fatigue reduction and light operability were achieved.

In the cushion pad for a seat according to the second aspect, the hardness difference from the tail seat portion can be further increased by a simple modification such that a lateral slit is added to the leg seat portion, and the leg seat portion can be made larger. Increased soft feeling and the effect (b)
There is an advantage that can be strengthened.

In the cushion pad for a seat according to the third aspect, since the lateral slit is formed at or near the boundary between the tail seat portion and the leg seat portion, the functions required for the tail seat portion and the leg seat portion can be mutually performed. It was able to be fully demonstrated without interference, and the total performance could be improved. In the cushion pad for a seat according to the fourth aspect, a slit is formed in the horizontal frame portion so that the molding can be easily performed using a single kind of pad material, while a relatively hard material suitable for supporting the buttocks. A relatively soft horizontal frame suitable for contact with the thigh and the thigh can be realized, and the above-mentioned effect (b) can be obtained in the case where the horizontal frame is provided.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

Although not shown, the front seat of an automobile generally has a structure generally provided with a seat portion on which a occupant (occupant) sits, a backrest (back seat), and a headrest. The seat portion is configured by covering a cushion pad made of urethane foam or felt with a skin material made of genuine leather, vinyl leather, cloth, or the like. Next, the action pad A will be described.

As shown in FIG. 1, the action pad A is
The seating portion 1 is composed of horizontal frame portions 5 and 5 formed on the left and right sides and laterally outside through valley portions 4 extending forward and backward, respectively. The seating portion 1 has a hip for receiving and supporting the buttocks. Seat part 2
And a leg portion 3 for receiving and supporting the thigh. With reference to the upper surface 2a of the butt seat portion 2, the upper surface 3a of the leg seat portion 3 is set to a surface that is inclined forward and upward,
The upper surface 5a of the horizontal frame portion 5 is set to have an inclined surface that is generally higher and further higher toward the outer side.
Has a function of receiving and supporting the lateral movement of the occupant so as to be able to regulate it.

As shown in FIGS. 1 to 3, the left and right centers of the leg portions 3 corresponding to the front portion of the seating portion 1 have a predetermined depth along the front-rear direction (an example of the longitudinal direction of the thigh). In addition to forming the vertical slit 6, a horizontal slit 7 is formed to connect the front and rear intermediate portions of the left and right valleys 4 and 4 and the rear end of the vertical slit 6. This horizontal slit 7
Is set at a position between the buttocks portion 2 and the leg portion 3, and when a standard passenger is seated,
It exactly matches the position corresponding to the base of the thigh in the front-rear direction.

The horizontal slit 7 is disposed at a position L mm forward of the hip point HP in the butt seat portion 2, and it is preferable that L ≧ 30. In addition, the seating surfaces 2a and 3a which are the upper surfaces of the seating portion 1 should receive the ischial tuberosity of the occupant firmly, and the front corners of the seating surfaces 2a and 3a support the thighs only slightly. It is desirable to do so.

The groove depth d of the vertical slit 6 located at the left and right center as the cushion pad A is d ≧ 5 mm,
The width t is desirably t = 0.5 to 20 mm. In addition, the above-mentioned valley portion 4 can be regarded as a kind of a vertical slit, and its front-rear length can extend over the entire length of the seating portion 1 as shown in FIG. It may be one from the edge to seven lateral slits, and various types are conceivable.

As described for reference, the general thickness under the buttocks is 130 m.
As a result of simulating the surface pressure load distribution by the finite element method in a model in which vertical slits 6 having various depths are provided on the front edge of the cushion pad A of m The surface pressure at the measurement point and at the second measurement point slightly before and after the center in the front-rear direction is such that the deeper the slit depth is, the lower the pad hardness is, that is, the pad hardness is substantially softened, and the holdability (with the thighs) Was confirmed to be improved.

That is, the depth of the vertical slit 6 is 10 mm
First specimen, 20 mm second specimen, and 35 mm third specimen
When the test was performed on three types of test pieces, the surface pressure at the first measurement point was 5.6% for the second test piece and 6.6% for the third test piece, based on the first test piece, which was a control model. As a result, the surface pressure at the second measurement point was reduced by 11.5% in the second specimen and by 12.6% in the third specimen.

[Alternative Embodiment] The relaxation of the tensile stress by the left and right division of the leg portion 3 by the vertical slit 6 is particularly effective at the front edge portion of the leg portion 3, but as shown in FIG. Side slits 8 are formed along the front and rear directions (an example of the longitudinal direction of the thighs) at positions corresponding to the leg portions 3 in the front and rear directions on the upper surface 5a of each of the horizontal frame portions 5 and 5 so that the left and right sides of the legs Cushion pad A, which is also used for softening the movement of the user, may be used. The side slit 8 is formed in a cut shape whose front and rear ends are not opened.

A rear slit 9 extending in the left-right direction may be formed at the rear of the rear seat portion 2 so that the pad surface hardness can be substantially further softened so that the seating feeling can be improved. The rear slit 9 is also formed in a notched shape whose left and right ends are not opened.

As shown in FIG. 5, a pair of left and right vertical slits 4 and 6 for the left thigh and a pair of right and left vertical slits 6 and 4 for the right thigh are formed in the leg portion 3 in total of four. The cushion pad A in which the vertical slit of the book is formed may be used. As shown in FIG. 6, a plurality of lateral slits 7 are provided in the leg portion 3, or a plurality of side slits 8 are provided in the left and right lateral frame portions 5, 5.
Alternatively, a single or a plurality of left and right auxiliary slits 13 may be provided.

As shown in FIG. 7, the vertical slit of the leg portion 3 is formed into a different depth type vertical slit 10 having a depth d which becomes deeper toward the front edge of the seat, or as shown in FIG. Different width vertical slit 11 whose width becomes wider toward the front edge of the sheet
Alternatively, as shown in FIG. 9, the spring constant of the pad material in the leg portion 3 is increased toward the front side by forming it in the odd-numbered vertical slit 12 in which the number in the left-right direction increases toward the front edge of the seat. You may set so that it may become substantially low.

That is, the movement of the thigh in the left-right direction in the sitting posture is such that the thigh swings around the base (buttock). The pad material is configured to be softer toward the outer diameter side of the rocking movement in which is larger, and the easiness of moving the thigh is improved. As described above, it is advantageous from the viewpoint of ergonomics to make the operability and ease of relaxation of the legs more comfortable.

The above-mentioned various slits 4, 6 to 9 may have a groove depth direction obliquely downward or wavy (zigzag shape) in plan view, and may have a groove width or groove depth. The height and the like may be sequentially changed in the length direction.

[Brief description of the drawings]

FIG. 1 is a plan view of a cushion pad for an automobile seat.

FIG. 2 is a longitudinal sectional view of the cushion pad shown in FIG.

FIG. 3 is a cross-sectional view of a seating portion of the cushion pad shown in FIG. 1;

FIG. 4 is a plan view of a cushion pad provided with slits in a butt seat portion and a side frame portion.

FIG. 5 is a plan view of a cushion pad having four longitudinal slits.

FIG. 6 is a plan view of a cushion pad provided with various slits.

FIG. 7 is a partial side view of a seat showing a different depth vertical slit.

FIG. 8 is a partial plan view of a seat showing a different width vertical slit.

FIG. 9 is a plan view of a seating portion showing an irregular numbered vertical slit.

FIG. 10 is a longitudinal sectional view of a conventional cushion pad formed by soft molding.

FIG. 11 is a longitudinal sectional view of a conventional cushion pad formed by slab bonding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seating part 2 Buttocks part 3 Legs part 4,6 Slit 5 Side frame part 7 Side slit 5a Upper surface 9 Slit

Claims (4)

[Claims] 1. A left and right side of a leg seat portion for receiving and supporting a thigh in a seating portion, along a longitudinal direction of the thigh, and
A cushion pad for a seat in which a slit having a predetermined depth is formed. 2. The rear end portions of the pair of slits are
2. The cushion pad for a seat according to claim 1, wherein the cushion pads are connected by lateral slits facing left and right. 3. The cushion pad for a seat according to claim 2, wherein the lateral slit is formed at or near a boundary between a butt seat portion for receiving and supporting the buttocks in the seating portion and the leg seat portion. . 4. The lateral movement of a occupant can be restricted to the left and right sides of a seat having a hip portion for receiving and supporting the buttocks and a leg portion for receiving and supporting the thigh. A seat cushion pad provided with a lateral frame portion for receiving and supporting, wherein a slit is formed along a longitudinal direction of a thigh at a position corresponding to the leg portion in a front-rear direction on an upper surface of each lateral frame portion. Cushion pad for seat.