JPH0243710Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a welding mold for vinyl sheets used for seats of motorcycles, scooters, etc. or chairs, etc., and in particular, two sheets are welded to the part corresponding to the ridge of the seat to form a keel. This invention relates to a welding mold for forming welded vinyl sheets.

Generally, seat A of motorcycles, scooters, etc.
As shown in FIGS. 1 and 2, a cushion material 4 is filled inside an inverted box-shaped welded vinyl sheet 1 in which a vinyl top sheet 2 and a side sheet 3 are welded to each other at their edges. That's what happens.

A keel 5 is formed at the welded portion of the top sheet 2 and side sheet 3, that is, at the ridge of the seat, to improve the appearance and shape retention of the ridge.

By the way, there is a welding mold shown in FIGS. 3 and 4 as a welding mold for the welding vinyl sheet having the above-mentioned keel.

That is, a flat metal lower mold 7 is overlaid and fixed on the upper surface of the flat metal base 6, a synthetic resin bank 8 is overlaid and fixed on the upper surface of the edge of the lower mold 7, and the end surface is turned inward. A flat metal core 9 having a recess 9a formed in a downwardly sloping shape toward the bank is removably placed on the upper surface of the lower mold 7 at a predetermined distance inward from the bank 8. The upper mold 10 was removably fitted into the groove A formed by the core 9 and the core 9 from above.

Note that 11 is a locking pin for skewering and locking the end of the sheet, and 12 is a closing body fixed to the inside of the upper mold 10, which closes the upper part of the recess 9a.

The welding mold has one sheet, for example, the side sheet 3, on the upper surface of the lower mold 7, and the edge thereof is placed on the bank 8.
The placed side sheet 3 is pressed and fixed with the core 9, and then the other sheet, for example, the top sheet 2, is placed on the upper surface of the lower mold 7, and then the other sheet, for example, the top sheet 2, is placed on the upper surface of the lower mold 7, and then the other sheet, for example, the top sheet 2, is placed on the top surface of the lower mold 7, and the end of the side sheet 3 is fixed with a locking pin. At the same time as attaching the skewer to 11, insert the core 9
Place it on the top surface of the machine. Next, the upper mold 10 is fitted into the groove A formed by the embankment 8 and the core 9, and the edge portions of the side sheet 3 and the upper sheet 2 are pressed and polymerized.
Melting the polymerized portion using a high frequency generator,
A part of it is flow-filled into the recess 9a side of the core, thereby molding the welded vinyl sheet 1 having a keel at the joint.

However, in the conventional welding mold described above, both the lower mold 7 and the core 9 are flat plates, and the entire surface of one sheet is held between them.

For this reason, when a sheet with an annular or arcuate ridge is held between the lower mold and the core as described above, folds and folds occur in the inner part of the sheet.
In other words, the wrinkles make it impossible to press and hold the edge of the sheet uniformly over the entire length, resulting in incomplete welding at the edge and the shape of the keel formed at the edge being uneven. It had some drawbacks.

The present invention was developed in view of the above circumstances, and by forming a cavity between the core and the base to accommodate the inner part of the sheet, it is possible to always ensure reliable welding and uniform welding regardless of the shape of the sheet. The object of the present invention is to provide a welding mold that can obtain a keel of the same shape.

In order to achieve the above object, the present invention has a structure in which a gap is provided between the inside of the core excluding the edge and the base to accommodate the inside of one of the vinyl sheets. Features.

Embodiments embodying the structure of the present invention will be described below with reference to FIGS. 5 and 6.

Reference numeral 20 denotes a base made of a flat metal plate, and a metal lower mold 21 curved in a horseshoe shape in plan view is fixed to the upper surface of the right end thereof.

The lower mold 21 has its outer end raised high, and the main body 22
The inner end thereof is lowered to form a stepped shape having an integral support portion 23. A bank 24 made of synthetic resin is fixed to the upper surface of the outer end of the main body 22, and a locking pin 25 is provided on the upper surface of the bank 24 over its entire length to skewer and lock the edge of the upper sheet, which will be described later. to be fixed.

On the upper surface of the support part 23 of the lower mold 21, the lower mold 2
A core 26 that presses and fixes the edge of the vinyl side sheet 3 placed on the top surface of the sheet 1 is removably placed. This core 26 is curved into a horseshoe shape when viewed from above, and its upper surface height is approximately the same height as the upper surface height of the embankment 24 when the side sheet 3 is pressed. Then, on the outer periphery of the core, the joint surface between the lower mold 21 and the upper mold, which will be described later,
That is, a filling groove 2 in which the molten material of the sheet flows to form the keel 5 at a position facing the joint surfaces of both sheets.
7 is recessed in the circumferential direction.

Reference numeral 28 denotes a gap formed between the base 20 and the core 26, and by placing the peripheral part of the core 26 on the lower support part 23 curved in a horseshoe shape, the support part 23 A void portion 28 having a height corresponding to the thickness of . This void portion 28 accommodates the edge portion 3b of the side sheet 3 described above except for the edge portion 3a.

Reference numeral 20a denotes a dowel pin which is fixed upright on the base 20, and the core 26 is positioned by passing a vertical hole formed in the core 26 through the dowel pin 20a.

Further, the core 26 is crimped and fixed to the lower mold 21 by a pressing body 29 whose one end is in contact with the upper surface of the core 26 and the other end is in contact with the upper surface of the base 20, and an eccentric cam 30 which presses an intermediate portion thereof.

Reference numeral 31 denotes a lever for rotating the eccentric cam 30, and when the longer diameter side of the eccentric cam 30 is rotated downward as shown in the figure via the lever 31, the core 26 is crimped and fixed via the pressing body 29, Conversely, if you rotate the short diameter side of the eccentric cam 30 downward,
The crimping of the core 26 is released.

32 is a metal upper mold, which includes a bank 24 and a core 26.
The lower mold 21 is fitted into the gap formed by the
It is placed on the upper surface of the main body part 22 of.

The upper die 32 is for overlapping and pressing the edge 2a of the vinyl top sheet 2 onto the edge 3a of the side sheet 3, and skewers and locks the outer edge of the top sheet to the locking pin 25. , after its inner part is arranged to extend in the direction of the core 26, it is fitted into the above-mentioned gap from above.

On the inner peripheral wall of the upper mold 32, a plurality of presser pieces 33 are provided in the circumferential direction for pressing just inward of the edge portion of the upper sheet 2.

The presser pieces 33 are fixed to the upper mold 32 in a vertically adjustable manner by inserting screws that are screwed into the upper mold 32 into vertically elongated long holes 34 formed in each presser piece 33. . The fixing position of this presser piece 33 is adjusted up and down depending on the thickness of both sheets 2 and 3, and when the lower end of the upper mold 32 presses the upper sheet 2, the presser piece 33 also fixes the upper surface on the core 26. sheet 2
Adjust the amount of pressure. 35 is a spring that presses the presser piece 33 from above and below.

According to the above embodiment, one sheet, for example, the side sheet 3, is placed with its edge portion 3a on the main body portion 22 and support portion 23 of the lower mold 21, and its inner portion 3b
The core 2 is extended inwardly from the support portion 23.
6 is placed on the upper surface of the support part 23, the core 2
The inner part 3b of 6 is attached to the support part 23 with respect to the base 20.
A gap 28 is formed at a distance equal to the thickness of the side sheet 3 plus the thickness of the side sheet 3. For this reason,
The inner portion 3b of the side sheet 3 is no longer clamped by the core 26 and the base 20 even in the folded state, and the pressing force of the core 26 is applied exclusively to the support portion 23, and the inner portion 3b of the side sheet 3 is The core 2 is directly inward of the end edge 3a.
6 and the support portion 23 to press and hold them uniformly.

In this state, attach the top sheet 2 to the bank 24 at its end.
The locking pin is skewered and locked, and its inner part is arranged to extend in the direction of the core 26, so that the bank 24 and the core 26
When the upper die 32 is inserted into the gap formed by the above, the end edges 2a and 3a of both sheets 2 and 3 are pressed together.

If the welding mold is housed in a high frequency generator (not shown) in this state, the high frequency waves flowing between the upper mold 32 and the lower mold 21 will weld the joining edges of both sheets 2 and 3. A part of the melted material fills the filling groove 27 to obtain a welded vinyl sheet in which a keel is formed. In this case, since the side sheet is tightly clamped between the core 26 and the support section 23 of the lower die 21, the molten material will not leak outside inadvertently, and the set The keel is formed smoothly.

In addition, in the present invention, as shown in FIG. 7, the end of the side sheet 3 may be locked to the locking pin 25 in the same way as the end of the top sheet.

In addition, as shown in FIG.
The void portion 28 may be formed by providing the space a.

As is clear from the above embodiments, according to the configuration of the present invention, the inner part of the sheet held between the core and the lower die is inserted into the gap formed between the inner part of the core and the base. Therefore, even if the sheet has a complicated shape such that folds occur on the inside of the sheet, the edge where both sheets are joined will always remain smooth. Since the sheets can be held uniformly and tightly, both sheets can be reliably welded together, and the keel formed at the end edge can have a uniform shape.

[Brief explanation of drawings]

Figure 1 is a seat for a motorcycle or scooter, etc., Figure 2 is a sectional view of its main parts, Figure 3 is a sectional view showing how a conventional welding mold is used, and Figure 4 is a sectional view of its main parts showing its operating state. 5 is a sectional view showing the welding mold according to the present invention in use, FIG. 6 is a sectional view of the main part showing its operating state, and FIG. 7 is a sectional view of the main part showing another embodiment. . 1... Welding vinyl sheet, 2... Top sheet, 2a... Edge portion, 3... Top sheet, 3a...
...Edge, 3b...Inner part, 20...Base, 2
1...Lower mold, 22...Main part, 23...Support part,
24... Bank, 25... Locking pin, 26... Core,
27...Filling groove, 28...Gap, 29...Press body, 30...Eccentric cam, 31...Lever, 3
2... Upper mold, 33... Pressing piece, 34... Long hole, 3
5...screw, 36...spring.

Claims (1)

[Scope of utility model registration request] The edge of one vinyl sheet is placed on the lower mold fixed to the base, and the inner edge of the edge is pressed and fixed to the base side with a core placed above the base, and the edge of the other vinyl sheet is A welding metal whose part corresponds to the edge of one of the vinyl sheets, and which welds both vinyl sheets by sandwiching and heating the ends with an upper die and the lower die, which are arranged above the edge. A welding mold for a welding vinyl sheet, the mold having a cavity for accommodating the inner part of the one vinyl sheet between the inner part of the core except for the edge part and the base.