JP2001233217A - Crossing rod of crossing gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crossing rod of reduced manufacturing process, having high productivity, having impact resistance undamaged even in a collision by a vehicle, being unbroken even at largely bending time, being substantially restorable to the original shape at a gentle speed without being suddenly restored even when removing a load from the bending state, being particularly restorable even when broken and bent in the vicinity of a joining part, remarkably improving a restorable frequency and being unbroken even at repeatedly bending time. SOLUTION: This crossing rod is composed of a member by inserting a thermoplastic resin foam into a hollow mold having the whole or a part composed of thermoplastic elastomer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a blocking rod installed in a barrier such as a railroad crossing.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blocking rod of a circuit breaker in consideration of preventing a vehicle such as an automobile from escaping from a railroad crossing and being damaged by collision or bending.

[0002]

2. Description of the Related Art In a conventional level crossing circuit breaker, a bamboo or fiber reinforced plastic (FRP) block rod having an outer diameter of about 30 to 60 mm is opened and closed to prevent an automobile or the like from entering a railway track. . In addition, when a car is trapped inside a railroad crossing, the blocking rod does not completely prevent the car from traveling in order to avoid a serious accident such as a collision with the train. Bamboo and FRP products are used.

[0003] In recent years, a malicious vehicle that crosses a railroad crossing just before a circuit breaker closes and breaks a block bar has been incessant.
When such a vehicle is a freight vehicle, the vehicle may be broken not only by a collision of the vehicle but also by a large deformation due to a blocking rod being interposed between the driver's seat portion and the carrier.

[0004] On the other hand, any breakage of the breaker rod is related to the safety of railways and the safety of passing vehicles, so it is necessary to immediately replace and repair the breakage rod every time a breakage occurs. However, in recent years, about 4,000 broken rod breakage accidents have occurred in the JR West Japan Railway alone alone. In addition to ensuring safety, the number of breakage rod breakage accidents has decreased in terms of repair costs and securing personnel. Is desired.

In order to prevent the breaking rod from being pushed out of the railroad crossing without breaking the breaking rod, a breaking rod breaker utilizing elasticity of a spring or the like is attached to a connecting portion between the railroad crossing breaker and the breaking rod. A circuit breaker is also used.

[0006] Further, in combination with a breaking rod breakage preventing device, a breaking rod which is hard to break is disclosed in Japanese Patent Laid-Open No. 7-3000.
No. 72 discloses a mesh sheet formed of glass fiber or the like and a blocking rod made of a thermoplastic resin having a high elastic modulus, and JP-A-8-192748 discloses a reinforcing member provided to surround a lightweight core material, In addition, a traffic blocking bar mainly having a box cross-sectional shape in which a protective material is provided outside a reinforcing member has been proposed. Japanese Unexamined Patent Publication No. 11-29048 proposes a blocking rod made of a thermoplastic elastomer.

When considering a circuit breaker capable of reducing the breakage of the breaker rod due to a vehicle collision, a breaker breaker is provided,
In a conventional breaker using a bamboo or FRP breaker bar, if the speed of the colliding vehicle is sufficiently low, the break prevention device works effectively, and a breakage accident can be prevented. However, in actuality, if the vehicle collides at a very high speed to hurry to escape, or if the vehicle crosses the railroad crossing just before the blocking rod closes, the vehicle will also collide with the blocking rod at a considerable speed, as described above. In some cases, the blocking rod is caught between the driver's seat portion of the freight vehicle and the carrier, and the blocking rod may be greatly deformed. In such a case, the break prevention device cannot follow, and a large part of the impact acts on the shut-off rod, resulting in breakage.

Therefore, even if a break prevention device is provided for a bamboo or FRP blocking rod, a breaking rod breakage accident cannot be eliminated.

Further, in a circuit breaker using a blocking rod having high rigidity and elasticity as proposed in JP-A-7-30072 and JP-A-8-192748,
Even when the vehicle collides at a considerable speed, the rigidity and elasticity of the vehicle make it unlikely that the blocking rod will break. However, the blocking rod that has been bent without breaking in a collision with the vehicle will store a large amount of energy in proportion to its rigidity, and after passing through the vehicle, that energy will be released, and the blocking rod will quickly return from bending. It may harm pedestrians and other vehicles near the railroad crossing. Furthermore, since the blocking bar proposed in Japanese Patent Application Laid-Open No. 8-192748 must have a three-layer structure, the manufacturing process is complicated. In addition, since the cross section of the reinforcing member is box-shaped, it is difficult for a vehicle such as an automobile trapped in a railroad crossing to bend and to return when forced to escape.

On the other hand, a blocking rod made of a thermoplastic elastomer proposed in JP-A-11-29048 is
Has shock resistance that is not damaged by vehicle collision, does not break even when bent significantly, and does not suddenly recover even when the load is removed from the bent state, substantially at a gentle speed It has the excellent property of returning to its original shape, but it does not bend near the junction of the blocking rod made of other materials and the thermoplastic elastomer and does not return when a large vehicle crashes etc. was there. In addition, it has been desired that the overall number of times of relocation during bending be further improved.

[0011]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above.

Accordingly, it is an object of the present invention to provide a high productivity with a small number of manufacturing steps, an impact resistance which is not damaged even by a collision by a vehicle, does not break even when bent greatly, and a load is applied from the bent state. Even if it is removed, it returns to its original position at a gentle speed without sudden repositioning, and is particularly excellent in repositioning when it is bent near the joint, and the number of times of repositioning is drastic And further,
An object of the present invention is to provide a blocking rod that is not easily broken even when repeatedly bent.

[0013]

In order to achieve the above object, a barrier rod of a circuit breaker according to the present invention is provided by inserting a thermoplastic resin foam into a hollow molded body entirely or partially made of a thermoplastic elastomer. It is a blocking rod of a circuit breaker characterized by being constituted by a member consisting of, furthermore, the blocking rod,
It is composed of parts divided into two or more in the length direction, and the whole is constituted by connecting them, and the tip part of the component divided in the length direction is made of a thermoplastic elastomer Being constituted by a member obtained by inserting a thermoplastic resin foam into the hollow molded body, the thermoplastic resin foam is a hollow molded body made of a thermoplastic elastomer,
Being inserted in the form of straddling a joint with a thermoplastic elastomer or a hollow molded body made of other materials to be connected thereto, and the thermoplastic resin foam being a hollow one having a space in the center part , That the cross section of the blocking rod is circular, the thermoplastic resin foam is that the surface of which is adhered a thermoplastic resin film, the thermoplastic elastomer is polyester, polyurethane, polyamide, polyolefin, Polystyrene-based elastomer and plasticized polyamide, selected from any one or a blend of any combination thereof, the thermoplastic elastomer contains a fibrous reinforcing material, the fibrous reinforcing material is a glass fiber, Carbon fiber,
Being at least one fibrous reinforcing material selected from boron fibers, silicon carbide fibers, graphite, potassium titanate whiskers and aluminum borate whiskers; the thermoplastic resin foam being a polyolefin resin foam; The apparent density of the resin foam is 0.02-
0.2 g / ml is a preferable condition, and by applying these conditions, it is possible to expect to obtain a more excellent effect.

[0014]

According to the present invention, the blocking rod is constituted by a member obtained by inserting a thermoplastic resin foam into a hollow molded body entirely or partially composed of a thermoplastic elastomer.

A thermoplastic elastomer is a material having an elastic modulus between that of a very flexible material such as conventional vulcanized rubber and a highly rigid thermoplastic such as polystyrene, polyamide or polybutylene terephthalate. .
This thermoplastic elastomer has the characteristics of both a vulcanized rubber and a high-rigidity thermoplastic, and has impact resistance comparable to that of vulcanized rubber. It is a material that exhibits unique characteristics such as rubber elasticity that recovers to a high level, mechanical strength much higher than vulcanized rubber, and thermoplasticity that can be applied to all molding methods applicable to general plastics.

When a hollow molded body is formed by using the thermoplastic elastomer and a member into which a thermoplastic resin foam is inserted to constitute a blocking rod for a circuit breaker, even if the joint is bent at a joint portion in the event of a collision of a large vehicle, the position is restored. It does not break even when it bends greatly, part of the energy stored by the bend is absorbed by viscoelasticity, and even when the load is removed from the bent state, the original speed is substantially reduced. It is possible to realize a blocking rod which returns to the position and is hardly broken even if bending is repeated many times.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION
It is constituted by a member obtained by inserting a thermoplastic resin foam into a hollow molded body entirely or partially composed of a thermoplastic elastomer.

In the case where the blocking rod is composed of two or more parts divided in the length direction, the whole or a part of the constituent parts is made of a thermoplastic resin foam in a hollow molded body made of a thermoplastic elastomer. It consists of an inserted member. In particular, in the case of a dividing rod having a divided structure, in the case where the components gradually become thinner from the root to the tip for weight reduction, the tip component is the thinnest and is easily broken. Therefore, it is preferable that the tip part is a member formed by inserting a thermoplastic resin foam into a hollow molded body made of a thermoplastic elastomer. Other parts are made of a thermoplastic elastomer, fiber reinforced plastic (FRP), or the like, which may be a hollow molded body or a non-hollow molded body, but using a hollow molded body is lighter. .

In a blocking rod composed of parts divided into two or more in the length direction, and connected as a whole, the constituent parts are connected by several methods. For example, a method in which the cross-sectional sizes of the components to be connected are different, a small component is inserted inside a component having a large cross-sectional size, and the joint portion is covered with an adhesive tape or the like. A method in which the cross-sectional sizes of components to be joined are different, and when a small component is inserted inside a component having a large cross-sectional size, or when components having the same cross-sectional size are abutted, an adhesive is applied to and bonded to the joint. The parts to be joined are
Both are made of thermoplastic materials, and the cross-sectional sizes of the parts to be joined are different, and when inserting a small part inside a part with a large cross-sectional size or when mating parts with the same cross-sectional size, heat-welding the joint part Method
And the like. In any of the methods, the larger the area of the joining portion, the higher the joining strength. Therefore, it is preferable that the cross-sectional sizes of the components to be joined are different, and a small component is inserted inside the component having a large cross-sectional size and joined. . It is preferable that the thermoplastic resin foam is inserted so as to straddle a joint between the hollow molded body made of the thermoplastic elastomer and the hollow molded body made of the thermoplastic elastomer or another material connected thereto.

The cross-section of the thermoplastic resin foam used in the present invention may be any of a circle, an ellipse, a polygon, and the like.
More preferred. Further, the hollow cross section may be a donut shape having a continuous foam or a horseshoe shape having a discontinuous shape. Further, the structure of the foam may be a closed cell type, an open cell type, a compressed bead type or the like.

The cross section of the blocking rod of the present invention may be circular, elliptical, polygonal, or the like, but preferably has a circular cross section. The blocking rod of the circuit breaker of the present invention, which is constituted by a member formed by inserting a thermoplastic resin foam into a hollow molded body entirely or partially made of a thermoplastic elastomer, is hard to break even if the cross section is circular. . And when a cross section is circular, it is easy to bend and to return as compared with a block-shaped thing.

When the thermoplastic resin foam has a thermoplastic resin film adhered to the surface thereof, the thermoplastic resin foam is given a stiffness and the thermoplastic resin foam is inserted into the hollow molded body. In addition, the workability is improved by increasing the slipperiness at the time, and the abrasion resistance of the thermoplastic resin foam when used as a blocking rod is improved, thereby increasing the durability. Thermoplastic resin films are polyolefin-based, polyester-based,
The film is made of a resin such as a polyamide resin and has a thickness of about 10 to 500 μm. The surface may be processed.

[0023] The thermoplastic elastomer used in the present invention is a rubber elastomer such as a conventional vulcanized rubber, and is melted by heating like a general thermoplastic resin.
A material that has the properties of being able to be melt-molded, such as polyester, polyamide, polyurethane, polyolefin, polystyrene, polyvinyl chloride, silicone, and polybutadiene thermoplastic elastomers, plasticized polyamide, ionomer, and heat. And a plastic fluoroelastomer. Among these, in terms of mechanical strength, rubber elasticity, polyester-based, polyamide-based, polyurethane-based, polyolefin-based, polystyrene-based thermoplastic elastomer, and plasticized polyamide are preferable,
Particularly, a polyester elastomer is preferable. Furthermore, these thermoplastic elastomers can be used alone,
Alternatively, it can be used as a blend of any combination. When used as a blend, an optional compatibilizer can be further blended.

Further, as the thermoplastic elastomer used in the present invention, a thermoplastic elastomer containing a fibrous reinforcing material can be used for the purpose of improving its mechanical strength. As the fibrous reinforcing material used here, glass fiber, carbon fiber, boron fiber, silicon carbide fiber, silicon nitride, zinc oxide, graphite, calcium sulfate, alumina, potassium titanate whisker, aluminum borate whisker, wollastonite, Examples include magnesium borate, zirconia fiber, and tyrano fiber. Among them, glass fiber, carbon fiber, boron fiber, silicon carbide fiber, graphite, potassium titanate whisker, and aluminum borate whisker are preferable in view of improvement in mechanical strength. Further, these fibrous reinforcements can be used alone or in any combination.

Further, the thermoplastic elastomer of the present invention includes:
As long as the object of the present invention is not impaired, known hindered phenols, phosphites, thioethers, aromatic amines and other antioxidants, benzophenones, benzotriazoles, hindered amines and other light stabilizers and flame retardants , A nucleating agent, a pigment, a dye, a carbon black for coloring and the like can be arbitrarily contained.

The method for producing the hollow body made of the thermoplastic elastomer used in the present invention is not particularly limited. For example, the hollow body may be formed by any molding method such as injection molding, blow molding, extrusion molding, compression molding and the like. It is obtained by molding.

The thermoplastic resin foam used in the present invention is obtained by foaming a thermoplastic resin such as polyolefin, polystyrene, polyester, or polyamide. Among them, a foam using a polyolefin resin is preferable. . Specific examples of such a polyolefin-based resin include low-density polyethylene, medium-density polyethylene, and high-density polyethylene composed of monomers containing ethylene as a main component, and ethylene with butene-1, hexene-1, octene-1, Linear copolymerized polyethylene obtained by copolymerizing an α-olefin having 4 or more carbon atoms, such as 4-methylpentene-1, or ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene-acryl Ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer,
Ethylene-propylene copolymers, terpolymers composed of ethylene-propylene-diene monomers, polypropylene composed of monomers containing propylene as a main component, and propylene in the form of blocks of α-olefins such as ethylene and butene. Copolymers randomly copolymerized, or resins obtained by arbitrarily blending these polypropylene resins with the above-mentioned polyethylene resins can be exemplified.

The thermoplastic resin used for the thermoplastic resin foam of the present invention includes a thermoplastic resin within the range not impairing the object of the present invention.
Inorganic substances, emphasis agents, pigments, antioxidants, other processing aids, and the like can be included as necessary.

The thermoplastic resin foam of the present invention may be a crosslinked type or a non-crosslinked type. In the case of a cross-linking type, a thermoplastic resin previously cross-linked by an electron beam cross-linking method, a chemical cross-linking method, a silane cross-linking method, vulcanization, or the like is thermally decomposed into a foam such as azodicarbonamide, dinitrosopentamethylenetetramine, or the like. It is foamed by a normal pressure foaming method or a pressure foaming method using an agent. The non-crosslinked type is obtained by extrusion foaming into a desired shape with an extruder or the like using an evaporating foaming agent such as chlorofluorocarbon, butane, and hexane.

The apparent density of the thermoplastic resin foam used in the present invention is arbitrary, but is preferably 0.02 to 0.2 g / ml.

The present invention has a small number of manufacturing steps and a high productivity, has an impact resistance not to be damaged even by a collision by a vehicle, does not break even when bent greatly, and a load is removed from the bent state. If it breaks down at a slow speed, it can return even if it bends near the joint, and it is also related to a blocking rod that is hard to break even if it is repeatedly bent. Useful as a blocking rod.

[0032]

EXAMPLES The effects of the present invention will be described below with reference to examples. All percentages and parts in the examples are on a weight basis unless otherwise specified. The physical properties in the examples are
It was measured by the following method. -Apparent density Measured according to JIS K6767.・ Cross-linking degree The foaming agent is finely cut, precisely weighed, placed in a 300-mesh wire netting container, and heated with hot tetralin (130 ° C. ± 1 ° C.).
Time extracted. Next, the plate was thoroughly washed with acetone, dried with a vacuum drier, weighed precisely, and determined by the following formula. Degree of crosslinking (%) = weight of extraction residue / weight before extraction × 100

[Reference Example] [Production of Polyester Elastomer Hollow Molded Product (A-1)] A polyester-based thermoplastic elastomer “Hytrel” 2751 manufactured by Toray DuPont Co., Ltd. was extruded to an outer diameter of 48 mm and an inner diameter of 45 mm. , 1.6m long
Was molded.

[Production of polyester elastomer hollow molded article (A-2)] Polyester thermoplastic elastomer "Hytrel" 6347G manufactured by Du Pont-Toray Co., Ltd.
15 (glass fiber blending amount: 15%) was formed into a cylinder having an outer diameter of 48 mm, an inner diameter of 45 mm, and a length of 1.6 m by extrusion molding.

[Production of Polyurethane Elastomer Hollow Molded Product (A-3)] Using a polyurethane thermoplastic elastomer "Elastoran" RVP1007 (glass fiber blending amount: 15%) manufactured by Takeda Bird Urethane Industry Co., Ltd., and extrusion molding. A cylinder having an outer diameter of 48 mm, an inner diameter of 45 mm, and a length of 1.6 m was formed.

[Production of FRP hollow molded article (B-1)]
After the filamentous glass fiber is knitted into a cylindrical shape, the glass fiber cylinder is further impregnated with the unsaturated polyester resin, heated and cured in an autoclave, cut and polished, and has an outer diameter of 48 mm, an inner diameter of 45 mm, and a length of 1. 6m FR
A cylinder made of P was obtained.

[Production of FRP Hollow Molded Body (B-2)]
Knitting thread-like glass fiber into a tapered cylindrical shape,
Further, the glass fiber cylinder is impregnated with the unsaturated polyester resin, heated and cured in an autoclave, and then cut and polished to obtain an outer diameter of 44.20 mm at one end and an inner diameter of 4 mm.
1.00 mm, outer diameter 45.52 mm at other end, inner diameter 42.
A tapered FRP cylinder having a length of 00 mm and a length of 1.5 m was obtained.

[Production of Thermoplastic Resin Foam (C-1-5)] A polyolefin resin foam manufactured by Toray Industries, Inc.
It was thermoformed into a cylindrical shape as shown in Table 1.

[0039]

[Table 1]

Example 1 A polyurethane foam (C-3) was added to a polyurethane elastomer hollow molded body (A-3).
1) was inserted to produce a blocking rod. One end of this blocking rod is fixed with a 10 cm fixing margin and the other end is bent 90 ° at a speed of 0.1 m / sec, and then the load is released repeatedly until the cylinder does not return to a horizontal position. The number was recorded. Table 2 shows the results.

Comparative Example 1 A blocking rod was used without inserting a thermoplastic resin foam into a polyurethane elastomer hollow molded article (A-3). Example 1 of this blocking rod
A bending resistance test was performed in the same manner as described above. Table 2 shows the results.

Comparative Examples 2 and 3 A thermoplastic resin foam (C-1) was inserted into an FRP hollow molded body (B-1) to produce a blocking rod. A bending resistance test was performed on this blocking rod in the same manner as in Example 1. Further, a blocking rod was inserted into the FRP hollow molded article (B-1) without inserting a thermoplastic resin foam, and a bending resistance test was performed on the blocking rod in the same manner as in Example 1. Table 2 shows these results.
Shown in

[0043]

[Table 2]

As is clear from Table 2, the shut-off rod in which the thermoplastic resin foam is inserted into the hollow molded article made of the thermoplastic elastomer has a greater resilience when bent than the shut-off rod in which the thermoplastic resin foam is not inserted. Excellent, the number of times to return to the original shape is overwhelmingly large. On the other hand, the FRP blocking rod is broken once by bending 90 ° regardless of the insertion or non-insertion of the thermoplastic resin foam, is inferior in bending resistance, and has no improvement effect.

[Embodiment 2] A description will be given with reference to FIG. A cylindrical thermoplastic resin foam (C-2) 2 having an outer diameter of slightly less than 45 mm is inserted into a hollow body (A-1) 1 made of a cylindrical polyester elastomer having an inner diameter of 46 mm until the whole is hidden. Of the hollow body 1 made of polyester elastomer was stopped at a position about 20 cm from one end 1a of the hollow body 1. On the other hand, the outer diameter is 45.52 mm,
One end 3a of the tapered FRP hollow molded body (B-2) 3 having an inner diameter of 42.00 mm is inserted into one end 1a of the polyester elastomer hollow body 1, and the overlapping portion is 20 cm.
I tried to be. Further, the joining portion was fixed from the outside with an adhesive tape 4 to manufacture a blocking rod.

A portion 3 cm from the other end 3 b of the FRP hollow molded body 3 of the blocking rod was fixed as a margin 3 c, and this portion was fixed. Next, the polyester molded hollow molded body was bent 90 ° at a position (bending point A) 28 cm from one end 1a, and then the load was repeatedly released, and the number of bendings until the cylinder did not return to a substantially horizontal state, The number of times until the damaged portion was broken was recorded. Table 3 shows the results.

Example 3 Instead of the polyester elastomer hollow body (A-1) used in Example 2, a polyester elastomer hollow molded body (A-2) was used instead of a thermoplastic resin foam (C-2). Using a thermoplastic resin foam (C-3) instead of, a blocking rod was manufactured in the same manner as in Example 2, and the bending resistance was evaluated in the same manner as in Example 2. Table 3 shows the results
Shown in

Example 4 Instead of the polyester elastomer hollow body (A-1) used in Example 2, a polyester elastomer hollow molded body (A-2) was used instead of a thermoplastic resin foam (C-2). Using a thermoplastic resin foam (C-4) instead of, a blocking rod was manufactured in the same manner as in Example 2, and the bending resistance was evaluated in the same manner as in Example 2. Table 3 shows the results
Shown in

[Embodiment 5] A description will be given with reference to FIG. 41 mm outside diameter cylindrical thermoplastic resin foam (C-5) 2
Is attached to one end 3a of a tapered FRP hollow molded body (B-2) 3 having an outer diameter of 45.52 mm and an inner diameter of 42.00 mm.
0 cm was inserted. Next, a cylindrical polyester elastomer hollow molded body (A-2) 1 having an inner diameter of 46 mm is placed on a thermoplastic resin foam 2 partially inserted into a tapered FRP hollow molded body 3 by tapered FRP hollow molded body 3. Hollow molded body 3
Is inserted from the one end 3a to a position overlapping by 20 cm, and the joining portion is fixed with an adhesive tape 4, and the thermoplastic resin foam 2 is a hollow molded body 1 made of a thermoplastic elastomer;
A blocking rod inserted in such a manner as to straddle a joint with the FRP hollow molded body 3 connected thereto was manufactured. This blocking rod was subjected to a bending test in the same manner as in Example 2, and the results are shown in Table 3.

[Comparative Example 4] A thermoplastic resin foam (C-
2) Without inserting, the overlapping distance outside the tapered FRP hollow molded body (B-2) is 200 mm.
Then, the junction was fixed with an adhesive tape to produce a blocking rod. One end of this blocking rod composed of only the FRP hollow molded body (B-2) is fixed with a fixing margin of 100 mm, and 28 cm from the tip of the polyester elastomer hollow molded body (A-1) at the joint portion.
After bending at 90 °, the load was repeatedly released, and the number of bends until the cylinder did not return to substantially horizontal and the number of times until the bent portion was broken were recorded.
Table 3 shows the results.

[0051]

[Table 3]

Comparative Example 5 The polyester elastomer hollow body (A-1) used in Example 2 was replaced by FRP
The hollow molded article (B-1) made of a thermoplastic resin foam (C-
Using a thermoplastic resin foam (C-3) instead of 2), a blocking rod was manufactured in the same manner as in Example 2, and the bending resistance was evaluated in the same manner as in Example 2. This blocking rod was broken by one bending.

As is clear from the comparison between Examples 2 to 5 and Comparative Examples 4 and 5, the blocking rod of the present invention is excellent in bending resistance and extremely high in repositioning.

[0054]

According to the present invention, the number of manufacturing steps is small and the productivity is high, and it has impact resistance which is not damaged even by collision with a vehicle.
It does not break even when bent significantly, and even when the load is removed from the bent state, it does not suddenly restore, but restores substantially the original shape at a gentle speed,
Even if it is bent near the joint, it can be repositioned, and the number of times of repositioning is dramatically improved.
The present invention relates to a blocking rod that is hard to break even when repeatedly bent, and is useful as a blocking rod for a level crossing circuit breaker for a train track or the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a second embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a fifth embodiment of the present invention.

[Explanation of symbols]

 1: Hollow body of polyester elastomer 2: Foam of thermoplastic resin 3: FRP hollow molded body 4: Adhesive tape A: Bending point

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 391054464 1-10-10 Haradanaka, Toyonaka City, Osaka Prefecture (72) Inventor Masaya Okada 2-4-24 Shibata, Kita-ku, Osaka City, Osaka West Inside Japan Railway Company (72) Inventor Hiroshi Kuwahara 3-4-1-18 Nakanoshima, Kita-ku, Osaka-shi, Osaka Toray Dupont Co., Ltd.Osaka Head Office 1916 Kiriyama Inside Toray Pefic Products Co., Ltd. (72) Inventor Yutaka Noritake 1-10-10 Haradanaka, Toyonaka City, Osaka Prefecture F-term in Tetsuden Sangyo Co., Ltd. 5H161 AA01 RR04 RR14

Claims (12)

[Claims] An interrupting rod for an interrupter, comprising a member formed by inserting a thermoplastic resin foam into a hollow molded body entirely or partially made of a thermoplastic elastomer. 2. The shut-off rod according to claim 1, wherein the shut-off rod is made up of two or more parts divided in a length direction, and the whole is configured by connecting them. Cut off stick of machine. 3. The method according to claim 1, wherein the tip part of the component part divided in the longitudinal direction is a member formed by inserting a thermoplastic resin foam into a hollow molded body made of a thermoplastic elastomer. Item 3. A blocking rod of the circuit breaker according to Item 2. 4. The barrier rod according to claim 2, wherein the thermoplastic resin foam comprises a hollow molded body made of a thermoplastic elastomer, and a thermoplastic elastomer or another material connected thereto. A blocking rod of a circuit breaker inserted in a form straddling a joint portion with a hollow molded body made of: 5. The blocking rod of a circuit breaker according to claim 1, wherein the thermoplastic resin foam has a hollow shape having a space in a center portion. 6. The shut-off rod of a circuit breaker according to claim 1, wherein the cross-section of the shut-off rod is circular. 7. The shut-off rod for a circuit breaker according to claim 1, wherein the thermoplastic resin foam has a thermoplastic resin film adhered to the surface thereof. 8. The method according to claim 1, wherein the thermoplastic elastomer comprises a polyester, a polyurethane, a polyamide, a polyolefin, a polystyrene elastomer and a plasticized polyamide, or a blend of any combination thereof. The blocking rod of the circuit breaker according to any one of claims 1 to 7. 9. The shut-off rod of an interrupter according to claim 1, wherein the thermoplastic elastomer contains a fibrous reinforcing material. 10. The fibrous reinforcing material is one or more fibrous reinforcing materials selected from glass fibers, carbon fibers, boron fibers, silicon carbide fibers, graphite, potassium titanate whiskers and aluminum borate whiskers. The shut-off rod of the shut-off device according to claim 9, wherein: 11. The shut-off rod for a circuit breaker according to claim 1, wherein the thermoplastic resin foam is a polyolefin resin foam. 12. The thermoplastic resin foam according to claim 1, wherein the apparent density is 0.02 to 0.2 g / ml.
2. The blocking rod of the circuit breaker according to claim 1.