JPH08192471A - Structure of inflated seal member - Google Patents

Abstract

PURPOSE: To scarcely damage a boundary between reinforcing cloth and a rubberlike elastic material due to the follow-up of the cloth to the deformation of the material even at the part having a complicated curved shape or a small bending radius, to improve the fatigue resistance and to make progress of mounting operability by incorporating stretchability in the cloth. CONSTITUTION: An inflated seal member 1 is buried with stretchable reinforcing cloth 4 between a tube rubber (cylindrical element) 2 made of a rubberlike elastic material and an outer layer rubber 3. As the cloth 4, knitted fabric (knitted) having high stretchability and flexibility, or stretchable woven fabric (woven fabric woven by crimped yarns, stretchable yarns, false twist yarns, etc.) is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an inflatable seal member, and more particularly to the structure of an inflatable seal member using a stretchable cloth as a reinforcing cloth.

[0002]

2. Description of the Related Art Conventionally, it has been used for a sealing member arranged on the peripheral portion of a hatch cover for a ship, a sealing member arranged on the peripheral portion of an opening / closing door of a vehicle, and a portion for maintaining airtightness of a room or a container. As a seal member to be used, a low-pressure air is supplied to a tubular body formed of a rubber-like elastic material in which a reinforcing cloth is embedded to instantly expand the volume of the tubular body and tightly seal the air. And other gas bodies, liquids,
An inflatable seal member that blocks dust and the like is used.

[0003]

By the way, the conventional inflatable seal member is often used for the sealing portion of the straight line portion and the curved surface portion, but the conventional reinforcing cloth is a non-stretchable cloth such as plain weave cloth. Since it is used, it cannot be used for complicated curved surface parts, and repeated expansion and contraction causes fracture at the interface between the reinforcing cloth and the rubber-like elastic material (for deformation of the rubber-like elastic material There is a problem that the non-stretchable reinforcing cloth cannot follow) and the life is short.

The present invention was devised in view of the above-mentioned conventional problems, and by providing the reinforcing cloth with elasticity, it is possible to obtain rubber-like elasticity even in a complicated curved surface shape or a portion having a small bending radius. Since the reinforcing cloth follows the deformation of the material,
An object of the present invention is to provide a structure of an inflatable seal member which is less likely to be broken at an interface between a reinforcing cloth and a rubber-like elastic material, has improved fatigue resistance, and has improved mounting workability. To do.

[0005]

In order to achieve the above object, the present invention forms a tubular body from a rubber-like elastic material having a reinforcing cloth embedded therein, and allows a fluid to flow into or out of the hollow inside of the tubular body. The structure of the inflatable seal member is configured such that the tubular body is expanded and contracted thereby, and the gist is that a stretchable cloth is used as the reinforcing cloth. It is also possible to use stretchable knitting or stretchable fabric for the reinforcing cloth.

[0006]

The present invention is constructed as described above, and is capable of expanding and contracting as a reinforcing cloth embedded in a rubber-like elastic material (knit knitting, etc.) and expandable and contractible fabrics (crimped yarn, elastic yarn, false twisted yarn). By using a woven fabric), the degree of freedom of deformation of the reinforcing cloth is increased, the shear stress at the interface between the reinforcing cloth and the rubber-like elastic material is also reduced, and the fracture at the interface can be effectively suppressed. It can be done.

Further, since the reinforcing cloth follows the deformation of the rubber-like elastic material and has a large degree of freedom with respect to the deformation, even a complicated curved surface shape or a portion having a small bending radius should be used sufficiently. Can be done.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway perspective view of an inflatable seal member 1 using a conventional plain weave cloth.
Shows a sectional view showing a contracted state of the inflatable seal member 1 embodying the present invention. The inflatable seal member 1 comprises a tube rubber (cylindrical body) 2 which is a rubber-like elastic material and an outer rubber layer 3. A stretchable reinforcing cloth 4 is embedded between them.

As the reinforcing cloth 4, as shown in FIGS. 3 and 4, a knitted fabric (knit knitting) having high elasticity and flexibility, and a stretchable woven fabric (crimped yarn, stretched yarn, false twisted yarn, etc.) Woven fabric) is used. By using a stretchable knitted fabric or a stretchable woven fabric as the reinforcing cloth 4 embedded in the rubber-like elastic material as described above,
The degree of freedom with respect to deformation is increased, the shear stress at the interface between the reinforcing cloth 4 and the tube rubber 2 and the outer layer rubber 3 is also reduced, and the fracture at the interface can be effectively suppressed.

Further, since the reinforcing cloth 4 follows the deformation of the rubber-like elastic material and has a large degree of freedom with respect to the deformation, even a complicated curved surface shape or a portion having a small bending radius can be used sufficiently. You can do things. In addition, as a method of applying internal pressure to the inflatable seal member 1, gas,
The use of a fluid such as a liquid is conceivable. Due to the ease of use of the inflatable seal member 1, air pressure is generally used, and the working pressure is 1.5 to 2.0 Kgf / cm ² .

[0011]

As described above, according to the present invention, since the stretchable cloth is used as the reinforcing cloth of the inflatable seal member, the flexibility of deformation of the reinforcing cloth is increased, and the reinforcing cloth, the tube rubber, and the outer layer rubber are increased. The shear stress at the interface is also reduced, and there is an effect that destruction at the interface can be effectively suppressed.

Further, since the reinforcing cloth follows the deformation of the rubber-like elastic material and has a large degree of freedom with respect to the deformation, even a complicated curved surface shape or a portion having a small bending radius should be used sufficiently. It is possible to improve the mounting workability.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an inflatable seal member using a conventional plain weave cloth.

FIG. 2 is a cross-sectional view showing a contracted state of the inflatable seal member embodying the present invention.

FIG. 3 is an explanatory view showing an embodiment of a stretchable reinforcing cloth (knitting).

FIG. 4 is an explanatory view showing an embodiment of a stretchable reinforcing cloth (knitting).

[Explanation of symbols]

1 inflatable seal member 2 tube rubber (cylindrical body) 3 outer layer rubber 4 reinforcing cloth

Claims (3)

[Claims] 1. A tubular body is formed of a rubber-like elastic material in which a reinforcing cloth is embedded, and the tubular body is expanded or contracted by flowing a fluid into or out of the hollow inside of the tubular body. In the structure of the inflatable seal member, a stretchable cloth is used as the reinforcing cloth, and the structure of the inflatable seal member is characterized. 2. The structure of the inflatable seal member according to claim 1, wherein a stretchable knit is used for the reinforcing cloth. 3. The structure of the inflatable seal member according to claim 1, wherein a stretchable fabric is used as the reinforcing fabric.