JPH04158024A - Structure of automotive cushion body and method for manufacture thereof - Google Patents

Abstract

PURPOSE:To improve the cushioning properties without increasing the total thickness by a method wherein a frame main body wherein a hole is formed on a part corresponding to a seat face part and a seat face body which is movable back and forth in the hole are connected with a spring member and the end part of the spring member is integrally connected with the frame main body and the seat face body. CONSTITUTION:An approximately square hole 34 is perforated on a part corresponding to a seat main part on both sides in the car width direction of a rear seat back A of a frame main body 3. A seat face body 4 is formed in such a size that is a little smaller than the size of the hole 34 so as to be movable back and forth in this hole 34 and is placed in the hole 34 and the frame main body 3 and the seat face body 4 are integrally connected and supported with torsion bars 5a and 5b so as to make mutually facing front faces 35 and 42 on the same face level. A matching mold having three molding spaces wherein a mold for the frame main body and a pair of molds for a seat face body are under a separated condition is used and blow molding is performed by inserting torsion bars 5a and 5b across the molding space. It is possible thereby to improve cushioning properties by action of a sheet pad 2 and the torsion bars 5a and 5b without increasing the thickness of the sheet pad.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a cushion body such as an automobile seat, particularly a rear seat back, and a manufacturing method thereof.

[Conventional technology]

Conventionally, the structure of a cushion body for an automobile includes, for example, a rear seat back shown in FIGS. 6 and 7, which includes a plate-shaped frame 1b made of synthetic resin, a seat pad 2, a skin 6 (only shown in FIG. 7), etc. It is known that the frame 1b is coated with the above-mentioned frame 1b.
A method is known in which a hollow plate is formed by blow molding.

[Problem to be solved by the invention]

In the structure of the rear seat back, which is a conventional cushion body, the frame 1b is relatively hard, and the spring layer is generally omitted in the rear seat back, so the cushioning performance is limited only to the seat pad 2. determined based on

Therefore, in order to improve the cushioning performance, it is necessary to increase the thickness of the seat pad 2, and if this is done, the thickness of the cushion body as a whole will increase.

Also, when the spring layer is added, the thickness of the cushion body increases.

As a structure that improves cushioning performance without increasing the overall thickness of the cushion body, for example, the frame portion corresponding to the seat surface where the greatest cushioning performance is required in the cushion body is cut out to accommodate this notch opening. A structure and manufacturing method can be considered in which another frame body is formed and this frame body is elastically supported by the frame. However, with this structure and manufacturing method, the frame body must be manufactured as a separate component, and in addition, in order to provide the elastic support, means and work are required to connect some kind of elastic member to both the frame and the frame body. These operations are time-consuming and cause an increase in costs.

This invention was made in view of the above circumstances, and provides a cushion body for an automobile that can improve cushioning performance without increasing the overall thickness, and can suppress an increase in cost. The purpose of the present invention is to provide a structure and a method for manufacturing the same.

[i! Means to solve the problem]

In order to achieve the above object, in claim 1, in the structure of a cushion body having a synthetic resin frame formed by blow molding and an Nli covering the surface of the frame, the frame corresponds to a seat portion. The seat body is made up of a frame body with a hole formed in the hole, a seat body having a size corresponding to the hole and movable back and forth within the hole, and a spring member connecting the two to each other. The spring member is arranged so as to apply a restoring force due to backward movement of the seat body, and an end of the spring member is integrally connected to the frame body and the seat body. It was configured as follows.

Further, in claim 2, in the method of manufacturing a cushion body according to claim f11, the cushion body is manufactured by forming a frame from a synthetic resin and covering the surface of the frame with an all material. It consists of a frame body with a hole formed in a part of the frame body, a seat body with a size corresponding to the hole and which can be moved forward within the hole, and a spring member connecting the two, and the spring member is attached to a molding metal. The frame body and the seat body were inserted into a mold so as to be connected to each other via the spring member, and then the frame body and the seat body were formed by blow molding.

[Effect]

According to the structure of claim 1, the seat body is inserted into the hole of the seven-frame main body so as to be movable back and forth, and the seat body is connected to the frame body by the spring member, so that the entire frame is The thickness of the seat body does not increase, and the cushioning performance is improved by the spring member that supports the back and forth movement of the seat body in addition to the covering layer.

Moreover, according to the structure of claim 2, the cushion body of claim 1 is formed.

[Actual example]

In the first embodiment shown in FIG. 1, a palm seed pack A as a cushion body includes a frame 1 made of synthetic resin, a seat pad 2 as a covering layer, and an outer skin (
(not shown). The frame 1 is formed to have the general shape of a rear seat back, and includes a frame body 3, a pair of seat surfaces 4, and a pair of upper and lower torsion bars (spring members > 5a) connecting the seat surfaces 4 to the frame body 3. , 5b.

The frame body 3 is integrally formed with a seat main side portion 31, a headrest portion 32, an armrest housing recess 33, etc., and portions corresponding to the seat main portions (seat surface portions) on both sides of the rear seat back A in the vehicle width direction. A substantially square hole 34 is formed through the hole 34, and the seat body 4 is formed to be slightly smaller than the hole 34 to such an extent that it can move back and forth within the hole 34. As shown in FIG. 2, both 3 and 4 are made of synthetic resin and are formed into independent hollow plates, and together constitute the general shape of the rear seat back.

The seat body 4 is placed in the hole 34, and as shown in FIGS. 2 and 3, the front surfaces 35 and 42 of each other are flush (second
(see figure) is supported by torsion bars 5a and 5b. These torsion bars 5a and 5b are
As shown in FIGS. 1 and 3 (only the torsion bar 58 is shown in FIG. 3), the main rods 51a, 51b and the main rod 51a.

An overhanging rod 52a is bent at right angles from both ends of 51b.

52b, and a protruding rod 53 that protrudes from the tips of the overhanging rods 52a, 52b in parallel with the main rods 51a, 51b.
a and 53b are integrally bent, and the overhanging rods 52a and 52b pass through the walls of the upper and lower end surfaces 41 of the seat body 4 and the walls of the inner edge portions 341 on both upper and lower sides of the hole 34. However, the main rods 51a and 51b are integrally connected to the respective walls inside the frame body 3, and the protruding rods 53a and 53b are inside the seat body 4.

As shown in FIG. 3, the torsion bar 58 has a stepped portion 511a formed on its main rod 51a, and the hole 34 of the frame body 3 is provided with a wall such that the wall of the inner edge portion 341 runs along the stepped portion 511a. A concave portion 342 is formed in the main rod 51a, thereby strengthening the integral connection so that the main rod 51a does not rotate together.

The cushion body A having the above structure is manufactured by first molding the frame 1, then covering the front surface of the frame 1 with the seat pad 2, and covering it with the skin 6 (see FIG. 2). The frame 1 is integrally formed by blow molding, with the frame body 3 and the seat body 4 connected by torsion bars 5a and 5b. That is, for example, using a blow molding mold having three molding spaces in which one for the frame body and one for a pair of seating surfaces are separated from each other, the torsion bar 5a is placed so as to straddle the molding spaces.
By inserting the torsion bars 5b and performing blow molding in this state, the frame 1 in which the torsion bars 5a and 5b are embedded in the frame body 3 and the seat body 4 and are connected to each other is integrally molded.

In the above configuration, when a seated person applies a rearward load (see arrow in FIG. 2) to the seat back A, the seat pad 2 is compressed by the load, and the seat body 4 resists the torsion bars 5a and 5b. (See the one-dot chain line in Figure 2). In other words, the load exerted by the seated person is supported by both the compressive restoring force of the seat pad 2 and the torsional restoring force of the torsion bars 5a and 5b.

In this way, in this embodiment, in addition to the seat pad 2, the seat pad 2 is
It is possible to obtain cushioning performance that exceeds the flexibility possessed by the seatback, and the cushioning performance can be improved compared to conventional seatbacks (see FIGS. 6 and 7). Moreover, the thickness of the seat back A can be kept the same as that of the conventional seat back, and the performance of the upper two cushions can be improved without increasing the thickness of the seat back.

In addition, since the frame 1 can be integrally molded by blow molding, it is easier to manufacture than, for example, when the frame body and the seat body are individually blow molded and then a torsion bar is inserted and attached afterwards. In addition to this, it is possible to prevent an increase in cost and avoid an increase in man-hours. Furthermore, since they are integrally molded, the degree of connection between the torsion bars 58, 5b, the frame body 3, and the seat body 4 can be improved, and the torsional restoring force of the torsion bars 58, 5b can be reliably exerted.

A second embodiment is shown in FIG. This second embodiment uses a coil spring 5C as a spring member that connects the frame body 3a and the seat surface body 4a. As shown in FIG. 5, this frame 1a has a locking end 5'1G of the coil spring 5C,
The coil spring 5C is inserted into a blow molding mold and blow molded so as to be integrally connected with the coil spring 5C and the seat body 4a. In this second embodiment as well, the same effects as in the first embodiment can be obtained.

Other aspects of the first and second embodiments will be described below.

A. In the above embodiment, the case where the cushion body is a seat back is shown, but the cushion body is not limited to this, and may be, for example, a seat bottom, or may be not only a rear seat but also a front seat.

B. In the above embodiment, the shape of the hole and the seat body are square, but the shape is not limited to this, and may be circular or polygonal, for example.

C9 In the above embodiment, the hole 34 is formed through the hole 34, but the present invention is not limited to this, and for example, a recessed hole that allows the seat body to move back and forth may be formed.

D. In the above embodiment, the upper and lower parts of the seat body are supported by spring members, but the present invention is not limited to this, and, for example, both sides of the seat body may be supported.

〔Effect of the invention〕

As explained above, according to the structure of the automobile cushion body according to claim 1 of the present invention, the cushioning performance can be improved without increasing the overall thickness, and the increase in cost can be suppressed. I can do it.

Further, according to the structure of claim 2, the cushion body of claim 1 can be manufactured easily and reliably, and as a result, the restoring force of the spring member can be easily and reliably manufactured compared to the case where the spring member is attached later. Therefore, the effect of improving the cushioning performance as claimed in claim 1 can be easily and reliably obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the first embodiment of this invention, and the second
The figure is an enlarged cross-sectional explanatory view of the cushion body taken along line 6 in Fig. 1, Fig. 3 is an enlarged perspective view of the frame with part of it cut away, and Fig. 4 shows the frame of the second embodiment. Perspective view,
5 is a partially enlarged front explanatory view of FIG. 4, FIG. 6 is a view corresponding to FIG. 1 showing the structure of a conventional cushion body, and FIG. 7 is a view corresponding to FIG. 2 of the conventional cushion body. 1.18... Frame, 2... Seat pad, 3゜3a... Frame body, 4, 4a... Seat body, 5a
. 5b...Torsion bar, 5C...Coil spring, 6...Skin, 34...Hole, A...Seat pack. Patent applicant Delta Kogyo Co., Ltd. Representative Patent attorney Etsushi Kotani
Patent Attorney Chief 1) Masamukai Patent Attorney Takao Iroi Figure 4 Figure 5

Claims (1)

[Claims] 1. In the structure of a cushion body having a synthetic resin frame formed by blow molding and a coating layer covering the surface of the frame, the frame has a hole in a portion corresponding to the seat surface. It consists of a formed frame main body, a seat body having a size corresponding to the hole and movable back and forth within the hole, and a spring member connecting both to each other, and the seat body is arranged so as to close the hole. , the spring member is arranged so that a restoring force is applied by the backward movement of the seat body, and an end of the spring member is integrally connected to the frame body and the seat body. Structure of automobile cushion body. 2. In the manufacturing method of a cushion body, which is manufactured by forming a frame from synthetic resin and coating the surface of the frame with a coating layer, the frame is a frame body in which a hole is formed in a part of the seat surface. The seat body has a size corresponding to the hole and is movable back and forth within the hole, and a spring member that connects the two. A method of manufacturing a cushion body for an automobile, characterized in that a frame body and a seat body are inserted so as to be connected to each other, and then the frame body and the seat body are formed by blow molding.