JPS6138335Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a signal transmission device for an insulating boom used in an aerial work vehicle for electrical work.

For aerial work vehicles used for electrical work,
In order to prevent electric shock accidents for workers on the work platform installed at the tip of the boom, the boom is insulated, and there is a Fiber optic cables are used as a means of signal transmission, but in the past, the fiber optic cables were passed through the narrow interior space of the insulated boom together with the oil supply hoses, so contact with the oil supply hoses or vibrations could cause the fiber optic cables to become damaged. There was a risk of damage to the optical fiber cable if sufficient care was not taken when assembling or servicing the boom.

The present invention was developed in view of the above circumstances, and it prevents damage to the optical fiber cable by integrally inserting the optical fiber cable inside or around the FRP insulation boom made of glass fiber and plastic. It is an object of the present invention to provide a signal transmission device for an insulated boom that prevents the occurrence of damage and facilitates assembly and disassembly of the boom.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows an aerial work vehicle, in which a telescopic boom 3 is pivotally supported by a swivel base 2 provided on a vehicle body 1 and is erected by a erecting cylinder 8. It is composed of a boom 4, an intermediate boom 5, and a tip boom 6, and is expanded and contracted by a telescopic device (not shown), and a work platform 7 on which a worker rides is held in equilibrium at the tip of the tip boom 6.

The tip boom 6 is an insulating boom made of FRP made of glass fiber and plastic such as epoxy resin, and insulates between the work platform 7 and the intermediate boom 5.

As shown in FIGS. 2 and 3, an optical fiber cable 9 is inserted into the inner circumference of the tip boom 6 in a circular shape parallel to the boom's longitudinal direction, and is molded integrally with the tip boom 6. fiber cable 9
An optical signal is transmitted between the workbench 7 and the intermediate boom 5.

FIG. 4 shows another embodiment, in which the optical fiber cable 11 is wound together with the glass fiber when the insulating boom is manufactured by filament winding method etc. 11 is inserted through it.

With the above configuration, when assembling the boom,
It is no longer necessary to pass the optical fiber cable through the internal space of the insulated boom, and it is only necessary to connect other cables or equipment to the ends of the optical fiber cable that protrude from both ends of the insulated boom. You can pass an oil supply hose, etc. through it.

As described above, according to the present invention, damage to the optical fiber cable due to contact with an oil supply hose or the like or vibration can be prevented, and the boom can be easily assembled and disassembled.
Furthermore, a signal transmission device for an insulated boom is provided that can effectively use the internal space of the boom.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the aerial work vehicle, Fig. 2 is a cross-sectional view of the insulated boom taken along a plane parallel to the boom longitudinal direction, and Fig. 3 is a sectional view of the insulated boom in the boom longitudinal direction. FIG. 4 is a cross-sectional view of an insulating boom showing another embodiment. 3... Telescopic boom, 6... Tip boom (insulated boom), 9, 11... Optical fiber cable, 10
...Insulation boom.

Claims (1)

[Scope of utility model registration request] Made from glass fiber and plastic
A signal transmission device for an insulated boom, characterized by an optical fiber cable that is integrally inserted into or around the FRP insulated boom.