JPS6262004A - Resilient shrinking body - Google Patents

Abstract

PURPOSE:To prevent that stitch of a knitted reinforcing construction which is put on the external periphery of a pipe body becomes irregular at the close parts to closing members which close both open ends of a shrinking body by providing a reinforcing layer made of rubber or resilient rubber member outside of said pipe body in the adjacent part to the closed member. CONSTITUTION:A resilient shrinking body consists of a rubber or resilient rubber pipe body 1, which is reinforced externally with knitted reinforcing construction 2 made of high tensile fiber or of similar kind and capped and joined with closing members 3 at opposed ends having a connecting hole 8 at least one side thereof. When pressure fluid is fed and discharged into and from the pipe body 1, the body 1 is deformed to increase in diameter so that the shrinking force is generated in the axial direction. In the constitution as above, a pipe-like reinforcing layer 10 which is made of the same material, rubber or resilient rubber, as used in the pipe body 1 is put between the pipe body 1 and the reinforcing construction 2 in the adjacent part to the closed member 3 at the side of the internal hollow 7 of the pipe body 1. The reinforcing layer 10 is laid, extending from one end of the closing member 3 in the axial direction of the pipe body 1 as long as approximately one to two times of the internal diameter of the pipe body 1.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an air bag whose outer periphery is reinforced with a braided reinforcement structure, and which expands and deforms in diameter when pressurized fluid is supplied to generate a contraction force in the axial direction.・Relates to type of elastic contractile body.

(Prior art) An airbag-type elastic contracting body that expands in the radial direction and contracts in the longitudinal direction by introducing pressurized fluid has an extremely low vertical ω compared to devices that use electric motors or hydraulic cylinders. It has many excellent features not found in conventional actuators, such as being light, smooth in motion, and easy to control.
For example, the one shown in FIG. 4 is known from Japanese Patent Publication No. 52-40378. In FIG. 4, 1 is a tubular body, 2 is a braided reinforcement structure on its outer periphery, 3 is a closing member at both ends, and 4 is a caulking cap.

For the tubular body 1, rubber or a rubber-like elastic material is usefully used in terms of air impermeability and flexibility, but equivalent materials such as various plastic materials may be substituted.

The braided reinforcement structure 2 has a braided structure that reaches a so-called rest angle (54°44') at the time of maximum expansion due to internal pressure filling of the tubular body 1, and is made of organic or inorganic high tensile strength m.
Miscellaneous materials such as aromatic polyamide van <Kevlar (trade name), twisted or untwisted bundles of filaments such as ultrafine metal wires, etc. are suitable.

One of the closure members 3 is bored on at least one side with a connecting hole 8 which communicates with the internal cavity 7 of the tubular body 1 via a hole 6 formed in the lengthwise direction of the nipple 5, in which a fitting 9 is mounted. Although not shown in the fitting 9, there is an operating pressure source,
For example, by connecting an air compressor by a conduit containing a flow control valve and applying a controlled pressure within the internal cavity 7 of the tubular body 1, the braid angle of the braided reinforcing structure 2 is enlarged, i.e. by a pantograph movement. The expansion diameter and the resulting contraction in the axial direction, that is, the distance between the connecting bottle holes of the closing member 3 is reduced.

(Problem to be Solved by the Invention) By the way, the above-mentioned airbag type elastic contracting body expands radially outward as a whole when pressurized fluid is applied to its internal cavity. is the closing member 3
Since the deformation of the tubular body and the braided reinforcement structure is restrained by the caulking cap 4 that cooperates with these members, a sudden change in diameter occurs. Therefore, in the vicinity of the closure part, each gAt/
Since the tensions acting on f1 are different, a uniform pantograph movement is no longer possible. As a result, the braided reinforcing structure is prone to breakage, and as schematically shown in FIG. However, there was a problem in that the tubular body was easily damaged. This means that the inner diameter of the tubular body is larger than its axial length.
In other words, this is particularly noticeable for elastic contraction bodies with short effective lengths.

(Objective of the Invention) The present invention has been made in view of these problems, and provides an elastic contractile body with excellent durability in which the braided reinforcement structure does not break even at the ends of the closing member. Its purpose is to.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the elastic contractile body of the present invention has a structure in which, in particular, the elastic contraction body of the present invention has a structure that is substantially 1 to 2 times the diameter of the tubular body on the outside of the tubular body in the vicinity of the closing member. A reinforcing layer of rubber or rubber-like elastic material is provided extending axially inwardly of the tubular body from at least the end of the closure member over the length of the closure member.

(Function) According to this elastic contractile body, the reinforcing layer restricts sudden deformation of the tubular body and the braided reinforcement structure in the vicinity of the closing member when pressurized fluid is supplied to the inside of the tubular body.
There is no damage to the tubular body because the braided reinforcing structure does not break down and therefore the tubular body does not protrude radially outwardly from the broken portion. This reinforcing layer of rubber or rubber-like elastic material also allows some deformation of the tubular body and the braided reinforcing structure in the vicinity of the closure member, so that the losses due to this reinforcing layer to the contraction forces generated in the elastic contracting body are It's very small.

(Example) The elastic contractile body of the present invention will be explained below with reference to the drawings.

FIG. 1 is a cross-sectional view of a part of the elastic contractile body of the present invention, and portions similar to those shown in FIG. 4 are designated by the same reference numerals. 1 is a tubular body, 2 is a braided reinforcement structure,
3 indicates a closing member, and 4 indicates a crimped cap. In this embodiment, similarly to the tubular body 1, a tubular reinforcing layer 10 made of rubber or rubber-like elastic material is provided outside the tubular body near the closure member 3, and more specifically, inside the tubular body. It is provided between the tubular body 1 and the braided reinforcing structure 2 near the closing member on the cavity 7 side. In consideration of the deformation of the tubular body as shown in FIG. It is better to extend it over

Further, in this embodiment, the reinforcing layer 10 is extended outward in the axial direction of the tubular body from the end of the closing member 3 on the inner space 7 side,
Although the configuration is such that the caulking cap 4 is attached to the closing member, the present invention is not limited to this, and by extending inward in the axial direction of the tubular body from the end of the closing member on the internal cavity 7 side, the desired shape can be achieved. Get the effect. Note that the reinforcing layer 10 may be bonded to the tubular body 1 and configured integrally.

Note that the thickness of the reinforcing layer is selected taking into account the pressure of the pressurized fluid applied to the elastic contractile body, but the thickness of the reinforcing layer is selected in consideration of the extensibility of the rubber or rubber-like elastic material forming the tubular body. However, its thickness is at most the thickness of the tubular body.

A reinforcing layer 1 is provided between the tubular body 1 and the braided reinforcing structure 2.
0, it is conventional to attach these parts to the closure member 3 using the crimping cap 4.

Even if pressurized fluid is applied to the internal cavity of the elastic contracting body configured in this manner through a connection hole provided in the closing member at one end to expand the diameter of the tubular body, the tubular body will not close to the closing member. Unlike conventional elastic contractile bodies, there is no sudden change in diameter, and therefore no knitting is caused in the braided reinforcement structure.

FIG. 2 shows another embodiment of the invention. In this embodiment, the tubular body 1 and the reinforcing layer 10 are formed separately as in the embodiment shown in FIG. This makes assembly with the member 3 even easier.

Note that, similar to the embodiment shown in FIG. 1, stepped portions may be provided at both ends of the tubular body, i.e., the reinforced portions, i.e., the thick wall portion, and at the center portion, i.e., the normal thick portion. In this example, by connecting the reinforcing part and the central part with a tapered straight line, deformation of the tubular body at the boundary between the part with the reinforcing layer and the part without the reinforcing layer when pressurized fluid is applied is prevented. It can be made more calm.

FIG. 3 shows another embodiment of the invention. In this embodiment, an annular reinforcing layer 10 made of rubber or a rubber-like elastic material is provided on the outer periphery of the braided reinforcing structure 2. The fact that it extends inward in the axial direction of the body 1, preferably over a length of about 1 to 2 times the inner diameter of the tubular body, is the same as in the previously described embodiments. In this embodiment, since the reinforcing layer can be attached to the outer periphery of the braided reinforcement structure, the attachment can be made easier.

Note that the reinforcing layer 10 may be bonded to the braided reinforcing structure 2 using a suitable adhesive or the like, but the pantograph movement of the braided reinforcing structure 2 may be This is not very advantageous since there is a risk that it will be restrained by the reinforcing layer, so if it is necessary to fix it, it is better to fix it with the caulking cap 4.

Incidentally, in the prior art, in order to prevent the braided reinforcement structure from breaking in the vicinity of the closure member, the length of the tubular body was required to be approximately 20 times the inner diameter of the tubular body, but the elasticity of the present invention According to the shrinkable body, even if its length is about 10 times the inner diameter of the tubular body, no knitting will occur. Furthermore, the pressure required to destroy the elastic contractile body, that is, the burst pressure, was increased by about 25%.

Note that the present invention is not limited to these examples, and for example, reinforcing layers may be provided between the tubular body and the braided reinforcing structure and on the outer periphery of the braided reinforcing structure, and within the scope of the claims. Various modifications are possible.

(Effects of the Invention) As described in detail above, according to the elastic contracting body of the present invention, by providing a reinforcing layer on the outside of the tubular body near the closing member, the elastic contracting body is maintained in the vicinity of the closing member even when pressurized fluid is applied. Sudden expansion deformation does not occur. Therefore, the braided reinforcement structure does not cause the braid to break near the closure member, and the tubular body does not locally protrude from this broken part, so the durability of the elastic contractile body is significantly improved. The fracture strength is also improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a cross section of a part of an elastic contractile body of the present invention. FIG. 2 is an explanatory diagram showing a cross section of another elastic contracture body of the present invention. FIG. 5 is an explanatory diagram showing, in an exaggerated manner, a state in which a pressurized fluid is applied to the elastic contracting body shown in FIG. 4. FIG. 1... Tubular body 2... Braided reinforcement structure 3
... Closing member 4 ... Caulking cap 5.
... Nipple 6 ... Hole 1 ... Internal cavity
8... Connection hole 9... Fitting 1
0... Reinforcement layer Figure 1 Procedure Correction Writing method) December 2, 1985 Michibe Uga, Commissioner of the Patent Office 1, Indication of the case 1985 Patent Application No. 199313 2, Name of the invention Elasticity Contractor 3, relationship with the amended person case Patent applicant (527) Bridgestone Corporation 4,
Agent 6? li “Detailed description of the invention” “Brief description of the drawings” in the correct subject specification
Column 7, Contents of the amendment (as shown in the attached sheet) 1. "Near the closing part" on page 4, line 7 of the specification is corrected to "near the closing member." 2. On page 10, line 19 of the same page, ``Figure 2 is partially cut away'' to ``Figures 2 and 3 are examples of other embodiments of the elastic contractile body of the present invention.'' Correct the part to "cut off".

Claims (1)

[Claims] 1. Rubber or rubber-like elastic material whose outer periphery is reinforced with a braided reinforcement structure of high-tensile fibers, and whose openings at both ends are sealed and bonded on at least one side with a closing member having a connecting hole. In an elastic contracting body that expands and deforms in diameter by supplying and discharging pressurized fluid into and out of the tubular body to generate a contractile force in the axial direction, rubber or rubber is attached to the outside of the tubular body near the closing member. reinforcing layers made of a shaped elastic material, these reinforcing layers extending inward in the axial direction of the tubular body from at least the end of the closure member over a length of substantially 1 to 2 times the internal diameter of the tubular body; Features an elastic contractile body. 2. The elastic contractile body according to claim 1, wherein the reinforcing layer and the tubular body are integrally formed. 3. The elastic contractile body according to claim 1, wherein the reinforcing layer is provided on the outer periphery of the braided reinforcing structure.