JPH0543810Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a rubber bag for press used to apply a uniformly distributed load to a bent article.

[Prior art]

Conventionally, for example, skis are of a laminated type made of plywood, and are formed by interposing an adhesive between each laminated layer and applying heat and pressure. This ski is not flat and has curved parts at its leading and trailing ends, so it cannot be pressure-formed using a flat press. Therefore, during molding, in order to apply an evenly distributed load to the ski, a wooden mold that matches the curved part is placed on one side of the ski, a rubber bag is placed on the other side, and air is pumped into the rubber bag. The bag is inserted and internal pressure is applied so that the rubber bag follows the shape of the curved part of the ski.

However, this rubber bag is molded flat, and the elasticity of the constituent rubber varies depending on the area, making it impossible to fully follow the shape of the ski. There is.

[Purpose of invention]

The object of the present invention is to provide a rubber bag for pressing that can sufficiently follow the shape of a bent article such as a ski.

[Structure of the idea]

For this reason, the present invention provides a rubber bag that forms a convex curved surface and a concave curved surface on the surface while air is trapped inside, which is constructed with a rubber coated sheet of Sudarecdo in which the convex curved surface portion is arranged on a bias, and the concave curved surface is The gist of the present invention is a rubber bag for pressing, characterized in that a portion thereof is constructed of a plain-woven rubber-covered sheet or a radially arranged rubber-covered sheet of Sudareccord.

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view showing how a ski is formed using a rubber press. 1st
In the figure, reference numeral 1 is a ski; on the bottom surface of the ski 1 there is a lower mold 2 that matches the shape of the curved part of the ski 1; Rubber bug 3 is placed there.
Further, an upper wooden mold 4 is placed on the upper surface of the rubber bag 3. Molding is performed by applying pressure to the lower wooden mold 2 and the upper wooden mold 4.

The rubber bag 3 has a front fastener 5 and a rear fastener 6, which allow the rubber bag 3 to
Prevents internal air from leaking to the outside.

In the present invention, the convex curved surface portion 7 of the rubber bag 3 is constructed of a rubber-covered sheet of Sudareccord arranged on a bias in order to increase extensibility. This rubber-covered sheet is, for example, a rubber-covered sheet used as a carcass layer of a bias tire.

The concave curved surface part 8 of the rubber bag 3 is a part where contraction force acts, so it is made of a non-stretchable material.
That is, it is composed of a rubber-covered sheet of plain woven cloth or a rubber-covered sheet of radially arranged Sudarecord. As the rubber-coated sheet of plain woven cloth, a general rubberized cloth may be used. In addition, the rubber-covered sheet of Suda Records arranged radially is, for example,
This is a rubber-covered sheet used as the carcass layer of radial tires. When constructing the concave curved surface portion 8 with these sheets, these sheets may be placed on a rubber coated sheet of Suda record placed on the bias.

Next, an example of a method for manufacturing a rubber bag will be shown below.

First, as shown in FIG. 2A, the rubber covered sheet 11 of Suda Record placed on a bias is pasted onto the rubber sheet 10, and as shown in FIG. Match and paste. 13 is a butt portion. Then, as shown in Figure 2C, the angle is 45° to the axial direction.
Two plies are pasted together at a bias angle, and a non-stretchable material is partly pasted on the parts where contraction force acts as shown in FIG. (2nd
Figure E), perform vulcanization.

[Effect of idea]

As explained above, in the rubber bag of the present invention, the convex curved surface part is made of a rubber coated sheet of Suda record arranged on the bias, and the concave curved part is composed of a rubber coated sheet of plain woven cloth or the rubber coated sheet of Suda record arranged radially. Since it is constructed from a covering sheet, the suda cord placed in the bias direction stretches when air is injected, while the suda cord placed in the plain woven fabric or radially does not stretch, so that a bent portion is naturally formed. Further, wrinkles do not occur at the bent portion. Therefore, according to the present invention, it is possible to obtain a rubber bag that can sufficiently follow the shape of a bent article such as a ski.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional explanatory diagram showing how a ski is formed using a rubber bag for pressing, Figures 2 A to E
FIG. 1 is an explanatory diagram showing an example of the method of manufacturing a rubber bag according to the present invention. 1...Ski board, 2...Lower last, 3...Rubber bag, 4...Upper last, 5...Front stopper, 6...
...Rear fastener, 7...Convex curved surface portion, 8...Concave curved surface portion, 10...Rubber sheet, 11...Suda record covering sheet arranged on the bias.

Claims (1)

[Scope of utility model registration request] In a rubber bag that forms a convex curved surface and a concave curved surface on the surface while air is trapped inside, the convex curved surface portion is made of a rubber-coated sheet of Suda Record arranged on a bias, and the concave curved surface portion is made of a rubber coated sheet of plain woven fabric. 1. A rubber bag for pressing, characterized in that it is composed of a covering sheet or a radially arranged rubber covering sheet of Suda Record.