JPH03297796A - Load support unit made of flat rubber bag - Google Patents

Abstract

PURPOSE:To improve manufacturing efficiency by cutting a long rubber molded product, provided at the interior with a beltlike fluid-filling space, to a desired length to form a flat rubber substance, nipping and compressing two opening end sides by means of press plates to form an airtight fast rubber bag product, and locating a fluid feed and discharge valve to the side part of the bag product. CONSTITUTION:A long rubber molded product 5 provided at the interior with a beltlike fluid-filling space 4 is cut at 6 to a desired length to form a flat rubber substance 7. The flat rubber substance 7 is formed such that a rubber sheet reinforced with synthetic resin cords 8 is integrally molded in a beltlike shape, and during molding, a resin film mould release agent is located in an intermediate part for vulcanization-molding. Press plates 11 and 12 being an U-shaped metal are inserted in both edges of the flat rubber substance 7 cut in a desired length and fastened for integral formation. A fluid feed and discharge valve 13 is previously attached to the press plate 11 in a manner to be inserted to the space 4. Thus, a cargo seat support unit dormed of the flat rubber bag 7 can be easily manufactured.

Description

[Detailed Description of the Invention] (Field of Application of the Invention) This invention is applicable to air jacks, air bags, etc.
The present invention relates to a load support unit made of a flat rubber bag used as a lifting device for a structure, and particularly to a structure that can be manufactured efficiently and easily.

(Prior art and its drawbacks) Conventionally, the bag structure of a load support unit using a flat rubber bag has been manufactured individually, and as shown in Fig. 1, it is made of two rubber sheets having a reinforcing cord layer (not shown). A manufacturing method is adopted in which the sheets 1 and 2 are overlapped, the folding margins 3 prepared around the four circumferences of one rubber sheet 1 are folded back and overlapped, and then vulcanization molding is performed in a vulcanization mold. However, the above method has drawbacks such as time-consuming molding operation, low productivity, large dimensional accuracy, and large nonuniform appearance.

(Structure) This invention proposes a load unit made of a flat rubber bag that improves the above-mentioned drawbacks.A long rubber molded product having a band-shaped fluid-filled space inside is prepared in advance, and this long rubber molded product is An airtight flat rubber bag is formed by clamping and pressing the open edges of the flat rubber body obtained by cutting the flat rubber body to a desired length from both sides with a presser plate, and at the same time, the fluid supply reaching the fluid filling space is A load unit made of a flat rubber bag includes a discharge valve provided on a side surface of the flat rubber bag body.

(Specific Example) In the load unit made of a flat rubber bag according to the present invention, as shown in FIG. A flat rubber body 7 obtained by cutting 6 a rubber molded product 5 into a desired length is prepared.

As shown in the enlarged view of FIG. 3, this flat rubber body 7 is made by integrally molding a rubber sheet made of a synthetic resin cord 8 such as nylon or vinylon into a belt shape and reinforced with a steel cord or the like. For example, a polyolefin thermoplastic resin film (not shown) may be vulcanized and molded with a mold release material inserted in the intermediate portion.

Therefore, the flat rubber body 7 in this example has a width of 3 with a gap in the center of the rubber sheet and both edges firmly vulcanized and bonded.
A belt-like long product 5 having a length of 0 to 100 cm can be cut into arbitrary lengths 6 to be provided in large quantities.

The open end 9.10 of the flat rubber body 7 thus cut
On the other hand, as shown in FIG. 4, pressing plates 11 and 12 having a length equivalent to the width of the flat rubber body 7 are clamped and pressed from both sides to form an airtight flat rubber bag.

In this example, the holding plate 11.12 is a metal fitting with a U-shaped cross section, and the open end sides 9.10 of the flat rubber body are crimped and integrated to form a flat rubber bag body with high airtightness and pressure resistance. .

The fluid supply/discharge valve 13 previously attached to the holding plate 11 is provided on the side surface as shown in the figure, and the inside of the valve 13 reaches the fluid filling space 4 of the flat rubber body 7, so that liquid and compressed This allows gas to be injected.

Next, in FIG. 5, a cylindrical long rubber molded product 1 is attached to a flat rubber body 7.
4 can be used, and in FIG. 6, two presser plates 15 and 16 are brought into contact with both sides of the open end sides 9 and 10 of the flat rubber body 7, and fastening means such as bolts and nuts are attached. 17, the bag is clamped and pressed to form an airtight flat rubber bag.

As shown by the imaginary line in Fig. 5, the reinforcing cord 8 of the long cylindrical rubber molded product is extended into the rubber in a biased manner to ensure sufficient load bearing capacity and durability when filled with compressed gas. It can hold pressure, and the amount of elongation and therefore the lifting height can be increased.

The flat rubber bag load support unit described above is connected to a compressed fluid injector such as a compressor (not shown) through a fluid supply/discharge valve, and is inflated by injecting compressed air or the like to apply internal pressure, resulting in a large load support capacity. Able to demonstrate

For example, a support unit with side length of 500 x 500 mm has an internal pressure of 5
The maximum lifting height when expressed as kg/crn' is 250mm.
The load bearing capacity is approximately 600 kg.

(Effects) According to the invention described above, a flat rubber body obtained by cutting a long rubber molded product into a desired length is used, and the open end sides are held from both sides by a presser plate (5). Since the product is manufactured in a vacuum, various sizes can be manufactured in large quantities efficiently, and the dimensional accuracy and appearance can be significantly improved compared to conventional products.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional manufacturing method of a load support unit using a flat rubber bag, Fig. 2 is a perspective view showing an example of a flat rubber body used in the present invention, and Fig. 3 is a partially enlarged view of Fig. 2. 4 is a perspective view showing an example of the load support unit of the present invention, FIG. 5 is a perspective view showing another example of the flat rubber body, and FIG. 6 is a perspective view showing another example of the load support unit. It is. 4...Fluid filling space, 5.14...
・Long rubber molded product, 7...Flat rubber body, 8...
...Reinforcement cord, 11.12.15.16...
... Holding plate, 13...Fluid supply/discharge valve. (6)

Claims (1)

[Claims] (1) A long rubber molded product with a band-shaped fluid-filled space inside is cut to a desired length, and the open end of the flat rubber body is clamped and pressed from both sides with a presser plate to ensure airtightness. A load support unit made of a flat rubber bag, which forms a flat rubber bag and is provided with a fluid supply/discharge valve reaching the fluid filling space on a side surface of the flat rubber bag.