JPH07246664A - Stretchable operation rod - Google Patents

Abstract

PURPOSE:To obtain a tough lightweight stretchable operation rod excellent in electric insulating properties and reduced in distortion. CONSTITUTION:A layer of a carbon fiber 2 is provided to the intermediate part in the thickness direction of a cylindrical member 4 molded from glass fiber reinforced plastic 3 and an omission part 1 is provided to the intermediate part in the longitudinal direction thereof over a predetermined distance. The layer of the carbon fiber 2 is provided to the intermediate part in the thickness direction of the end part of the cylindrical member 4 excepting the superposed fitting part of the end part thereof and, further, the layer of the carbon fiber 2 is provided to the intermediate part in the thickness direction excepting the cylindrical member 4 of either one of the base end part or intermediate part of an operation rod. By this constitution, a tough lightweight stretchable operation rod excellent in electric insulating properties and reduced in distortion is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present application relates to a telescopic operation rod, and more particularly to an operation rod used for overhead line work such as telephone lines and distribution lines.

[0002]

2. Description of the Related Art As this type of operating rod, various types have been conventionally manufactured and used according to the application.
Among them, those formed of a material having a high insulation property are used for those used in places where there is a risk of electric shock, such as telephone line construction and distribution line construction. Mostly used is glass fiber reinforced plastic molding, but when glass fiber reinforced plastic is used for telescopic operation rod,
Due to these characteristics, the electrical insulation is remarkably good, the tensile strength and the tensile elastic modulus are extremely large, and the elastic recovery rate is 100%.
Although it shows many advantages such as being close to, it also has a bad point. The telescopic operation rod used for telephone line work and distribution line work is 5 to 12.3 m long, and since the place of use is generally a heavy traffic facing the road, it is also operated from the safety aspect. Sex is important. For example, in the case of telephone construction, the height of the line stretched over the telephone pole is 5-6m, so
The operating rod used is also approximately the same length when extended. When the wire is extended, the operation rod is used to hang the wire car for the wire extension on the messenger cable, and to operate the fall prevention master rope for lifting the utility pole. At this time, if there is wind, it is difficult for the operating rod of 6 m glass fiber reinforced plastic molding to stand upright by itself due to its weight, and even if the base end is set upright to stand upright, its elasticity makes it difficult. In many cases, the middle part was bent and the tip was difficult to operate to the intended position. When operating the weight of the main rope or the like, this flexibility appears remarkably even in a windless state, and it is difficult to lock the cable because the tip portion swings. As a solution to this problem, if the thickness of each part of the expandable rod is increased in order to increase the rigidity, the weight increases, and the weight becomes too heavy for one person to handle. Further, in the work of distribution line, since the work is performed at a higher position, the length of the telescopic rod becomes longer, which causes a more remarkable problem.

[0003]

Therefore, in the present application, in order to obtain high rigidity without increasing the weight while maintaining the electrical characteristics and the mechanical characteristics of the glass fiber reinforced plastic, the middle of the cylindrical member in the thickness direction is obtained. The conventional problem is solved by providing a layer of carbon fiber having low specific gravity, high strength, and high elastic modulus in the portion. Further, when laminating the carbon fiber, the surface layer is avoided due to the problem of insulation, the carbon fiber is laminated on the intermediate layer, and a non-conducting portion where the carbon fiber is missing is provided at a predetermined portion in the length direction.

[0004]

[Embodiment] In order to prevent electrical connection to the operating part at hand when the live wire comes into contact with the distal end of the telescopic operating rod, the surface should be covered with an insulator over the entire length including the distal end.
In addition to that, a configuration in which an insulating portion is provided in the middle portion is effective. In the present application, glass fiber reinforced plastic 3 is used as the base material in consideration of required factors such as weight, rigidity, elasticity, and insulation. As shown in FIG. 1, a similar carbon fiber 2 was formed on a semi-cured prepreg obtained by mixing a curing material with epoxy resin and impregnating a cloth woven with glass yarn.
Place a narrow sheet in the semi-cured state. This position is about one-third from the upper end of the glass fiber reinforced plastic 3 sheet, and is rolled into the core material from the upper end direction to form a cylindrical shape. Therefore, as shown in Fig. 3, the finished cross-section after the core material is removed after curing is the outer two layers of glass fiber reinforced plastic 3 layers, then the carbon fiber 2 layer, and the innermost layer again glass fiber reinforced plastic 3 layer. Becomes As can be seen in the distribution of bamboo vascular bundles, it is ideal for the pipe material to which bending stress is applied that the tough structures are densely arranged in a gradient toward the outer layer. Insulating properties are emphasized, and the two surface layers are three glass fiber reinforced plastic layers. With the above configuration, a unit cylindrical member of a telescopic operation rod that is rigid, tough, yet lightweight, and has excellent insulating properties can be obtained, but even though the two surface layers are covered with glass fiber reinforced plastic, The carbon fiber of the layer is a good conductor, and if it is exposed due to peeling of the surface layer, an unexpected accident is possible. Therefore, the non-conducting part where the carbon fiber is missing is provided in at least one part of the entire length. First, as shown in FIG. 1, one method is to provide a cut portion in which a carbon fiber layer is obliquely cut at predetermined intervals in a manufacturing process, and as a result of an experiment, this interval is 1
Around 00 mm is suitable. Also, by making the missing part obliquely overlapped with each other, when finished in a cylindrical shape, there is no discontinuity of the carbon fiber when viewed from the side, it is difficult to concentrate the load on one place, and it is easy to maintain stable rigidity is there.
In addition, a prepreg having the same thickness as the carbon fiber is arranged in the missing portion so as to have the same thickness to avoid concentration of load.
The second method is that the carbon fiber layers are not layered on both ends of the unit cylindrical member, and both end portions are portions that are successively polymerized and connected in a small diameter toward the tip direction, and even if the carbon fiber layers are missing. Because of the double structure and because the glass fiber layer having the same thickness as the carbon fiber layer is polymerized, the strength is not reduced and the conduction can be interrupted. This configuration is shown in FIG. In the third method, as shown in FIG. 6, when connecting cylindrical members each having a smaller diameter in the distal direction, carbon fibers are not layered on any of the unit members. For example, it has little effect on the overall bend.

[0005]

As described above, there are three possible methods and configurations for achieving the same purpose, and the insulating effect is almost the same regardless of which method is adopted. Further, the means for obtaining the effect is a change in the structure that can be performed without using a new material, and can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view of a cylindrical base material sheet according to a first embodiment of the present application.

FIG. 2 is a partial cross-sectional view of the operating rod of the first embodiment of the present application.

FIG. 3 is a sectional view of the present application.

FIG. 4 is a perspective view of a cylindrical base material sheet according to a second embodiment of the present application.

FIG. 5 is a partial cross-sectional view of the operating rod of the second embodiment of the present application.

FIG. 6 is a sectional view of an operating rod according to a third embodiment of the present application.

[Explanation of symbols]

 1 Missing part 2 Carbon fiber 3 Glass fiber reinforced plastic 4 Cylindrical member

Claims (3)

[Claims] 1. A cylindrical member 4 molded from glass fiber reinforced plastic 3 having a layer of carbon fibers 2 having a gap 1 at a predetermined distance in the lengthwise direction in the middle in the thickness direction, from the base end to the tip. Telescopic operation rod characterized by being connected in order of smaller diameter. 2. A layer of carbon fiber 2 is provided at an intermediate portion in the thickness direction except for a superposed fitting portion at an end portion of a cylindrical member 4 molded of glass fiber reinforced plastic 3, and the layer is gradually thinned from a base end portion toward a tip end. A telescopic operation rod characterized in that the cylindrical members 4 are connected so as to have a diameter. 3. When connecting glass fiber reinforced plastic 3 molded cylindrical members 4 having successively smaller diameters from the proximal end toward the distal end, one cylindrical member at either the proximal end or the intermediate part.
Except for 4, the telescopic operating rod is characterized in that a layer of carbon fiber 2 is provided in the middle portion in the thickness direction.