JPS6223651B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl seat used for the seat of a motorcycle, scooter, etc., and more particularly to a welded vinyl sheet and a welding mold thereof.

Generally, the seats on motorcycles, scooters, etc.
As shown in the figure, a cushion material is filled inside an inverted box-shaped welded vinyl sheet 3 in which a vinyl top sheet 1 and a side sheet 2 are welded together at their edges. .

A keel 4 is formed at the welded portion between the top sheet 1 and the side sheet 2 to improve the appearance and shape retention of the corner.

By the way, the conventional welded vinyl sheet 3
As shown in Fig. 2, a separate bead 5 is inserted at the edge of the top sheet 1 and side sheet 2 made of vinyl with a woven fabric pasted on their back surfaces, so that the three are integrated. It was made by welding. As shown in FIG. 3, this bead 5 was made by integrally forming a rod-shaped bead portion 5a forming a keel and a plate-like band portion 5b from a vinyl material. Note that A in the figure is the cushion material.

For this reason, in the conventional type, a bead 5, which is a special part, is required separately in order to form the keel 4, which increases the material cost.

Furthermore, in the conventional welding mold for welding vinyl sheets, as shown in FIGS. 4 and 5, an upper mold 7 on which one of the sheets, for example, the side sheet 2, is placed is fixed to the base 6, and A locking pin 8 through which the band portion 5b of the bead 5 and the edge of the other sheet, for example, the top sheet 1, are skewered and locked is erected on the outer edge of the mold 7 (right side in the figure), and the above-mentioned The core 9 against which the side sheet 2 is pressed is placed on the lower mold 7 at a predetermined distance from the locking pin 8, and the locking pin 8 and the core 9 are placed on the lower mold 7.
An upper mold 10 that can be fitted from above is provided between the core 9 and the locking pin 8, and the upper mold 10 is sequentially placed upwardly on the lower mold 7 between the core 9 and the locking pin 8, as shown in FIG. The side sheet 2, bead 5, and top sheet 1 which have been prepared are pressed from above by the upper mold 10 as shown in FIG.
In this state, the upper and lower molds 10 and 7 were heated to weld the overlapping portions of the side sheet 2, bead 5, and top sheet 1. Incidentally, reference numeral 11 denotes a tightening fitting for tightening the core 9, which is tightened by a wing nut 12.

In the conventional mold described above, since the outer edge 7a of the lower mold 6 is a plane at the same height as the placement surface 7b of the side sheet 2, the three parts of the side sheet 2, the bead 5, and the top sheet 1 When welding, the molten material flows outward from the upper and lower molds 7 and 10 and solidifies in an irregular shape. There was a drawback that required a lot of work.

Furthermore, both the bead 5 and the top sheet 1 had to be skewered and locked on the locking pin 8, which resulted in the disadvantage that placing materials in the mold required time and effort.

The present invention has been made in view of the above-mentioned circumstances, and the first object of the invention is to reduce the amount of melted material generated when two vinyl sheets are welded together, as shown in FIG. The purpose is to obtain an inexpensive welded vinyl sheet by forming a keel 4.

The second object of the invention is to provide a bank at the outer edge of the lower mold where the locking pin is located, and to fit the upper mold with the bank and the core placed on the lower mold. By forming a fitting recess and a melt-filling part filled with the melt of the vinyl sheet on the facing wall between the core and the upper mold, the first The present invention provides a welding mold that is most suitable for producing the welded vinyl sheet of the second invention.

The configuration of the present invention will be explained in detail below with reference to illustrated embodiments.

FIG. 6 shows a welded vinyl sheet 3 according to the present invention.
It is a cross-sectional view of main parts of , and each edge part 1 of a vinyl top sheet 1 with a woven fabric pasted on the back side and a vinyl side sheet 2 with a woven fabric pasted on the back side.
a, 2a are overlapped and welded together in a clasped shape, and the molten material melted and flowed from the respective end edges 1a, 2a during welding is solidified overlay 3a in a keel shape on the inner end of the weld.

FIG. 7 is a sectional view showing a welding mold for the welding vinyl sheet 3 shown in FIG. A bank 13 made of synthetic resin that protrudes upward along the edge of the side sheet 2 is fixed to the side edge 7a, and the edge of the top sheet 1 is skewered and locked onto the upper surface of the bank 13. The locking pin 8 is fixed in an upright position. The core 9 on which the side sheet 2 is pressed,
It is placed on the lower mold 7 at a predetermined distance from the embankment 13, that is, at a distance such that the upper mold 10 fits therein. An upper mold 10 is fitted and erected between the embankment 13 and the core 9, in which the side sheet 2 and the top sheet 1 are pressed together. The outer end wall of the core 9, that is, the wall of the core 9 facing the upper mold 10, is formed into a downwardly sloping recess to provide a melt filling portion 14, and the inner wall of the upper mold 10 is filled with the melt. A closing body 15 that closes off the upper part of the portion 14 is fixed.

Incidentally, reference numeral 16 in FIG. 7 is a dowel pin for positioning the core 9, which is erected and fixed on the lower mold 7.

Here, among the reference numerals given in FIG. 7, parts common to those in FIG. 4 are given the same reference numerals as in FIG. 4.

Since the present invention is configured as described above, the welded vinyl sheet 3 according to the present invention has a solidified overlay portion 3a of the molten material formed at the welded inner ends of both the top sheet 1 and the side sheet 2. Has high rigidity,
The shape retention of the welded part is improved, and the inner end of the welded part is raised, which improves the appearance.

Further, in the welding mold according to the present invention, since the bank 13 is fixed to protrude from the outer edge 7a of the lower mold 7, when one vinyl sheet, for example, the side sheet 2, is placed on the lower mold 7, the above-mentioned The inner wall 13a of the embankment 13 prevents the side sheet 2 from protruding outward.
The positioning of the mold onto the lower mold becomes easy (the state shown in FIG. 7).

Further, the core 9 is arranged at a distance from the bank 13,
Both of these form a fitting recess for the upper mold 10, and a molten material filling part 14 is provided with a recess in the wall facing the upper mold of the core 9, and a fitting recess is provided between the core 9 and the bank 13. The upper die 10 is used to form the upper and lower sheets 1,
Since both end edges 1a, 2a of the molds 2 are overlapped and pressed (the state shown in FIG. 8), if the upper and lower molds 7, 1 are housed in a high frequency generator (not shown) in this state, the upper and lower molds 7, 1
Both end edges 1a, 2a melted by heating at 0
The outward flow of the melt 3b is blocked by the embankment 13 and flows toward the inner melt filling part 14 (the state shown in FIG. 9). Then, after a predetermined period of time, the molten material 3b is taken out from the high frequency generator and left to cool, and then the molded top sheet 1 and side sheet 2 are taken out from each mold 7, 10 and the core 9, and the 12th As shown in the figure,
Cut the outer end (right end) 1a of the top sheet 1 along imaginary line A, and then cut the inner parts (left) of each top sheet 1 and side sheet 2 as shown by imaginary lines A and C in FIG. Then, it is bent to the right around the solidified overlay 3a (molten body 3b).

Then, as shown in Figure 6, each sheet 1,
The built-up solidified portion 3a connecting the parts 2 protrudes outward in the shape of a keel.

Here, the molten material filling portion 14 is formed by recessing the outer end surface of the core 9 in an arc shape as shown in FIG. The end face may be formed with a downward slope, and the grooves 14a may be formed at a predetermined pitch in the longitudinal direction. Further, the molten material filling portion 14 may be formed on the wall side of the upper mold 10 facing the core 9.

As explained above, the welded vinyl sheet according to the present invention does not require special parts separately.
A keel that improves shape retention and appearance can be formed at both welded inner ends, and an inexpensive welded vinyl sheet can be obtained.

In addition, the welding mold according to the present invention only requires adding a bank to the lower mold and forming a recess in at least one of the core or the relative face walls of the upper and lower molds, so that only a partial improvement of the conventional mold is required. The welded vinyl sheet of the first invention can be molded and has the effect of being inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a motorcycle seat on which the welded vinyl sheet according to the present invention is applied, Fig. 2 is a cross-sectional view of the main parts showing how the conventional welded vinyl sheet is used, and Fig. 3 shows its main parts. A perspective view showing,
4 and 5 are a sectional view and a sectional view of a main part showing a conventional mold, FIG. 6 is a sectional view of a main part of a welding vinyl sheet according to the present invention, and FIG. 7 is a welding mold according to the present invention. 8 and 9 are sectional views of main parts showing the welding process, FIGS. 10 and 11 are sectional views of main parts and perspective views of main parts showing other embodiments, and FIG. 12 FIG. 2 is a sectional view of a main part showing an inverted state of a welded vinyl sheet. 1...Top sheet, 2...Side sheet, 3...
Welded vinyl sheet, 4...keel, 5...bead,
6... Base, 7... Lower mold, 8... Locking pin, 9
... Core, 10 ... Upper mold, 11 ... Tightening fitting, 1
2... Butterfly nut, 13... Bank, 14... Molten material filling part, 15... Closure body, 16... Knock pin.

Claims (1)

[Claims] 1. A core is interposed between two vinyl sheets arranged in the vertical direction, and the ends of each vinyl sheet are extended outward from the core, and the ends of each vinyl sheet are The end portion of each vinyl sheet is surrounded by a mold from above and below and from the outside, and the end portions of each vinyl sheet are heated and melted while being polymerized and pressurized in the vertical direction using the mold, thereby causing the melted material to flow and collect from the mold in the direction of the core. Then, the heating of the mold is canceled to solidify the fluidized molten material, and then each vinyl sheet is turned over so that the core surface side of the solidified molten material faces outward. 2. A lower mold supporting one vinyl sheet, a bank fixed to the upper surface of the lower mold protruding along the edge of the one vinyl sheet, and a bank horizontally spaced apart from the bank to support the one vinyl sheet upward. The core is pressed from above, and the end of the other vinyl sheet, which is fitted from above between the embankment and the core and spanned from the top surface of the core to the top surface of the embankment, is pressed against the end of one vinyl sheet. an upper mold for polymerizing and pressing, a melt filling part having a concave cutout in the lower part of at least one of the horizontal facing walls between the core and the upper mold, and a heating device for heating at least one of the upper mold and the lower mold. Welding mold for welding vinyl sheet.