JPS61110516A - Manufacture of sheet - Google Patents

Abstract

PURPOSE:To prevent foamed resin from leaking outside, by a method wherein at the time of molding of a sheet pad which is unified with a sheet frame, a cap is put over a protrusion of the sheet frame and foam molding is performed under a state wherein a flange is put between pads. CONSTITUTION:A foaming agent is made to foam under a state wherein a flange 17 is put between a top force 14A and bottom force 14B in a sheet pad molding tool 14 by putting cap 16, on an end part of which the elastic flange 17 is formed, over a protrusion 12A from the sheet pad molding tool 14 arranged so that a sheet frame 12 and a part of the sheet frame 12 are protruded outside within a range extending to mating surfaces 15 with a sheet frame 12 of the molding tool 14 from the tip of said protrusion 12A. In this instance, as the flange is welded to those elastically with pressure they adhere closely one another and sealing properties becomes favorable.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing seats, particularly f! It is a seat for personnel, and includes a seat frame,
The present invention relates to an improvement in a method for manufacturing a seat including a seat pad made of a synthetic resin foam integrally formed with the seat frame.

[Conventional technique (i) As shown in FIG. 15, a seat 1 is provided with a seat frame 2 and a seat pad 3 made of a synthetic resin foam that is foam-molded while enclosing the seat frame 2. Proposed.

As shown in FIG. 16, such a seat 1 is manufactured by making the end portion 2A of the seat frame 2 protrude from the mating surface of the upper mold 4A and lower mold 4B of the mold 4 during foam molding of the seat pad 3. This prevents the foam from adhering to the end 2A of the seat frame 2, thereby making it possible to connect the end 2A to a seat cushion, a reclining groove, or the like.

However, the seat frame 2 generally uses press-formed iron plates or pipes as they are, but these have low processing accuracy and, as shown in FIG. 2,
A gap is created between the periphery of the seat frame 2 and the mating surfaces of the upper mold 4A and lower mold 4B of the mold 4, from which the foamed synthetic resin agent leaks and adheres to the end 2A of the seat frame 2. There was a problem in that the foamed synthetic resin agent adhering to the end portion 2A had to be removed in a subsequent process.

Also, in general, the end portion 2A of the seat frame 2 can be viewed from the outside when the seat 1 is in a completed state. Since it is located in a position where it will be exposed, it must be painted, and the tip of the end 2A must be chamfered for safety, making the work complicated. Ta.

On the other hand, it is possible to prevent leakage of the foamed synthetic resin agent by interposing a sealing material between the seat frame 2 and the mold 4, but the sealing material needs to be attached every time molding is performed using the mold 4. There was a problem that the manufacturing cost increased, and furthermore, Tr/l became 8 concave due to correction of the end of the sealing material.

In contrast, the present inventors previously applied for patent application No. 58-790.
According to No. 05, a seat frame is placed in a seat pad molding mold so that a part of the seat frame protrudes outward, and a foamed synthetic resin agent is foamed in the molding mold to form an integral part of the seat frame. In a method of manufacturing a seat for forming a seat pad, a cap is placed on a protrusion of the seat frame from the mold in a range from the tip of the protrusion to the point where the mold meets the seat frame; By foaming the foamed synthetic resin agent in the mold in the above-mentioned state, the cap doubles as a seal between the seat frame and the mold, and prevents the foamed synthetic resin agent from leaking from the mold during foam molding of the seat pad. In addition, we have proposed a method of manufacturing a seat in which the protruding end of the seat frame can be chamfered and painted using the cap.

However, since the cap was simply matched to the upper and lower molds of the seat pad mold, due to variations in the dimensional accuracy of the cap and the dimensional accuracy of the upper and lower molds, the cap and the upper and/or lower molds There was a problem in that a gap was created between the mold and the mold, resulting in insufficient sealing.

Problems to be Solved by the Invention J This invention has been made in view of the above-mentioned problems. It is an object of the present invention to provide a method for manufacturing a sheet that prevents insufficient sealing by a cap even if there are variations in assembly accuracy in a state where the sheet is sandwiched between the sheets.

[Means for Solving the Problems] The present invention includes arranging a seat frame in a seat pad mold so that a portion of the seat frame projects outward, and injecting a foamed synthetic resin agent into the mold. In the method for manufacturing a seat, in which a seat pad is formed integrally with the seat frame by foaming, a protruding portion of the seat frame from the molding die is formed from a tip of the protruding portion to a mating surface of the molding die with the seat frame. At the turning point, a cap having a flexible flange formed at the end is covered, and the flange is sandwiched between the upper mold and the lower mold of the seat pad mold,
The above object is achieved by foaming the foamed synthetic resin agent within the mold.

Further, the above object is achieved by offseting the upper mold and the lower mold in the flange length direction at the flange position and sandwiching the flange in the thickness direction.

Further, in the present invention, the seat frame is arranged in a seat pad molding mold so that a part of the seat frame protrudes outward, and a foamed synthetic resin agent is foamed in the mold, so that the seat frame is combined with the seat frame. In a method of manufacturing a seat for forming an integral seat pad, a protruding portion of the seat frame from the molding die has an end portion extending from a tip of the protruding portion to a mating surface of the molding die with the seat frame. , a cap having a pair of flanges arranged in parallel in the axial direction of the seat frame is placed on the mating part of the upper mold and the lower mold of the seat pad molding mold, with an interval approximately equal to the thickness t2, and the upper mold and the lower mold are The above object is achieved by inserting the mating portion between the pair of flanges of the cap, sandwiching the cap, and foaming the foamed synthetic resin agent in the mold in this state.

Furthermore, in the present invention, the seat frame is arranged in a seat pad molding mold so that a part of the seat frame protrudes outward, and a foamed synthetic resin agent is foamed in the molding mold to form the seat frame. In the method of manufacturing a seat, the protruding portion of the seat frame from the molding die has an end portion extending from the tip of the protruding portion to the point where the molding die meets the seat frame. is made of a flexible material with a flange, and the inner dimension of the inner space is slightly smaller than the outer dimension of the protruding part of the seat frame. The above object is achieved by foaming the foamed synthetic resin agent in the mold while being sandwiched between the mold and the lower mold.

[Function] In the sheet manufacturing method according to the present invention, the flexible flange provided at the end of the cap is sandwiched between the upper mold and the lower mold in the seat butt mold, whereby the cap, the upper mold, and the lower mold Even if there are variations in the molds and their assembly accuracy, the flanges are resiliently pressed against them, preventing gaps from forming.
This increases the sealing function during foaming of synthetic resin agents.

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

In this embodiment, as shown in FIG. 1, a seat frame 12 is placed in a seat pad mold 14 so that a portion of the seat frame 12 protrudes outward, and a foamed compound is formed in the mold 14. In a method of manufacturing a seat, in which a resin agent is foamed to form a seat pad 13 integral with the seat frame 12, the molding is applied to a protrusion 12A of the seat frame 12 from the mold 14 from the tip of the protrusion 12A. Type 1
4, a cap 16 having a flexible flange 17 formed at the end thereof is placed over the area extending to the seat frame 12 of No. The foamed synthetic resin agent is foamed in the mold 14 while the plastic material is sandwiched between the two.

The cap 16 is made of soft synthetic resin, and the flange 17 has a corrugated cross section, as shown in FIG. 4, so that it can be deformed within a certain range in the thickness direction.

Further, as shown in FIG. 2, the upper mold 14A of the seat pad mold 14 has an elongated U-shaped notch 18A formed from its lower end surface to allow the seat frame 12 to fit therethrough. .

The lower mold 14B also has an elongated U-shaped notch 18B formed from its upper end into which the cap 16 can be fitted.

These upper mold 14A and lower mold 14B are connected to the flange 17.
As shown in FIGS. 1 and 3, the flange 17
is compressed so that its corrugated cross section becomes flat.

Therefore, according to the method of this embodiment, in the mold 14,
When the seat frame 12 with the cap 16 placed on the protrusion 12A is set and the seat pad 13 is formed by foaming the synthetic resin agent in the mold 14, the cap 16, the upper mold 14A, and the lower mold 14B are formed. Even if variations occur in the dimensional accuracy of each of the dimensional accuracy and assembly accuracy of these, the flange 17 is supported in an elastically compressed state by the upper mold 14A1 and the lower mold 14B, so that the flange 17 Therefore, the upper mold 14A and the lower mold 1 of the mold 14 against the cap 16
The foamed synthetic resin agent can be prevented from leaking from the mating surface 15 of 4B.

Although the flange 17 of the cap 16 in the embodiment described above has elasticity in the thickness direction by having a wave-shaped cross section, the present invention is not limited to this. Upper mold 14A and lower mold 14B
Any structure may be used as long as it can be elastically sandwiched between the two.

Therefore, for example, as in the second embodiment of the present invention shown in FIGS. 5 and 6, the thin plate-like bent portion 2OA, which is continuous and integral with the cap 19, is sandwiched from both sides in the thickness direction. The flange 20 may be formed by attaching the urethane foam 20B in this manner.

Further, as in the third embodiment of the present invention shown in FIGS. 7 and 8, two members 22A, 22 are arranged in parallel in the thickness direction.
A cap 2 with a double-layered flange 22 consisting of B
It may be set to 4.

Furthermore, as in the fourth embodiment shown in FIGS. 9 and 10, a plurality of annularly protruding fins 2 are provided on the front and back surfaces.
The cap 28 may have a flange 26 with a diameter of 5 (#!).

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 11 to 13.

In this fifth embodiment, the protruding portion 12A of the seat frame 12
At the end, there is a gap 31C that is approximately equal in thickness to the joining part of the upper mold 14A and lower mold 14B of the seat pad mold 14.
Then, cover the seat frame 12 with a cap 30 having a pair of flanges 31A and 31B arranged in parallel in the axial direction,
The mating parts of the upper mold 14A and the lower mold 14B are inserted into the pair of flanges 31A and 318 of the cap 30 to sandwich the cap 30, and in this state, the foamed synthetic resin agent is poured into the mold 14. It foams.

Gap 28 between the pair of flanges 28A and 28B
As shown in FIG. 12, an annular protrusion 32 is formed on the bottom of G, which abuts the respective tips of the inserted upper mold 14A and lower mold 14B.
The sealing function is improved by making contact with the tip of the seal (see Fig. 13).

In this embodiment, the flanges 31A and 31B of the cap 30 sandwich the upper mold 14A and the lower mold 14B in the thickness direction, and at the same time, the upper mold 1
It is elastically sandwiched along the periphery of the seat frame 12 by the 4A1 lower mold 14B.

Also, the gap 2 between the pair of flanges 28A and 28B
8C is designed to become narrower in the direction of the central axis of the cap 26, so when the upper mold 14A1 and the lower mold 14B are inserted, the tips thereof are sandwiched in the thickness direction to ensure a more secure seal. It is something to do.

Further, the annular projection 30 is also elastically pressed against the tips of the upper mold 14A1 and the lower mold 14B, thereby further increasing the sealing function.

Next, a sixth embodiment of the present invention shown in FIG. 14 will be described.

In this sixth embodiment, the inner dimension of the inner space of the cap 34 is formed to be slightly smaller than the outer dimension of the protrusion 12A of the seat frame 12, and the flange 36
The cap 34 is made of a flat cylindrical member made of a flexible material integrally formed with the
It is designed to be elastically fitted into 2A.

In this embodiment, similarly to the first to fourth embodiments, the flange 36 is attached so as to be sandwiched between the upper mold 14A and the lower mold 14B in the thickness direction.

In the case of this embodiment, it is possible not only to prevent the foamed resin from leaking from the mating surfaces of the upper mold 14A and the lower mold 14B, but also to prevent the foamed resin from entering the inside of the cap 32.

[Effects of the Invention] Since the present invention is configured as described above, in the method of manufacturing a seat in which a seat pad is molded with a part of the seat frame protruding from the seat pad molding die, Even if there are variations in the dimensional accuracy of the cap, the dimensional accuracy of the upper and lower molds of the seat pad molding mold, and the assembly accuracy of these, the foamed synthetic resin foamed in the molding mold will still fit the cap and the upper and lower molds. It has the excellent effect of preventing leakage to the outside through the gap between the

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the sheet manufacturing method according to the present invention, FIG. 2 is an exploded perspective view showing the relationship between an upper mold, a lower mold and a cap in the first embodiment, and FIG. 3 4 is an enlarged sectional view taken along the TV-TV line in FIG. 2, FIG. 5 is a II perspective view showing the cap in the second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line VI-VI in FIG. 5, FIG. 7 is a perspective view showing a cap in the third embodiment of the present invention, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. 10 is a perspective view showing a cap in a fourth embodiment of the present invention, FIG. 10 is a sectional view taken along the line x-X in FIG. 9, and FIG. 11 is the same as FIG. 1 showing a fifth embodiment of the present invention. 12 is an enlarged sectional view showing the cap in the fifth embodiment, FIG. 13 is a sectional view showing essential parts of the fifth embodiment, and FIG. 14 is a sixth embodiment of the present invention. Decomposition #4 shown
15 is a perspective view showing a sheet to be manufactured by the method of the present invention, and FIG. 16 is a sectional view showing a conventional sheet manufacturing method. 12...Seat frame, 12A...Protrusion part,
14... Seat pad mold, 14A... Upper mold, 14B... Lower mold,
15...Matching surface, 17.20.22.26.31A, 31B, 36...
Flange, 19.24.26.28.30.34... Cap,
31C...Gap. Agent Matsu 111 Kei Yutaka Yaron

Claims (4)

[Claims] (1) A seat frame is placed in a seat pad mold so that a part of the seat frame protrudes outward, and a foamed synthetic resin agent is foamed in the mold to form a sheet that is integrated with the seat frame. In a method of manufacturing a seat for forming a pad, a protruding portion of the seat frame from the mold,
A cap having a flexible flange formed at the end is placed over the range from the tip of the protrusion to the mating surface of the mold with the seat frame, and the flange is attached to the upper and lower molds of the seat pad mold. A method for manufacturing a sheet, comprising foaming a foamed synthetic resin agent in the mold while the sheet is sandwiched between the sheets. (2) The upper mold and the lower mold are offset in the flange thickness direction at the flange position, and the flange is sandwiched between the flange in the thickness direction.
Method for manufacturing the sheet described in Section 1. (3) A seat frame is placed in a seat pad mold so that a part of the seat frame protrudes outward, and a foamed synthetic resin agent is foamed in the mold to form a seat integral with the seat frame. In a method of manufacturing a seat for forming a pad, a protruding portion of the seat frame from the mold,
In the range from the tip of the protrusion to the mating surface of the mold with the seat frame, the seat frame is provided with a gap approximately equal to the thickness of the mating portion of the upper mold and the lower mold of the seat pad mold at the end. A cap having a pair of flanges arranged in parallel in the axial direction is placed on the cap, and the mating portions of the upper mold and the lower mold are inserted between the pair of flanges in the cap to sandwich the cap, and in this state, the molding is performed. A sheet manufacturing method characterized by foaming a foamed synthetic resin agent in a mold. (4) A seat frame is placed in a seat pad mold so that a portion of the seat frame protrudes outward, and a foamed synthetic resin agent is foamed in the mold to form a seat integral with the seat frame. In a method of manufacturing a seat for forming a pad, a protruding portion of the seat frame from the mold,
The range from the tip of the protrusion to the mating surface of the mold with the seat frame is made of a flexible material with a flange at the end, and the inner dimension of the inner space is larger than the outer dimension of the protrusion of the seat frame. The method is characterized in that a foamed synthetic resin agent is foamed in the mold with a cap slightly smaller in size covered and the flange sandwiched between the upper and lower molds of the seat pad mold. Method of manufacturing sheets.