JP2002322676A - Antenna device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device for a construction machine eliminating any possibility of touching an obstacle on the outside. SOLUTION: A support cover 15 is attached to a support metal fitting 11 attached to a support 3 of an operation room and a cylindrical member 16 is supported to the support cover 15. The cylindrical member 16 is composed of a radio wave transmissive material such as carbon graphite etc. An antenna support plate 20 having a screw part 21 in its outer circumferential part is fastened to the upper end part of the cylindrical member 16. The antenna 22 is disposed in a lower surface of the antenna support plate 20 with its facing to the inward of the cylindrical member 16 and fixed to the antenna support plate 20 by an antenna connecting metal fitting 23. An antenna cable 24 to be connected to the antenna 22 is drawn out from the antenna connection metal fitting 23 and enters into the operation room via grommet 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a construction machine provided with a handrail, which is provided for ascending and descending to a driver's seat.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing several examples of radio and radio communication antennas mounted on a conventional construction machine such as a hydraulic excavator or bulldozer. Numeral 30 denotes a manually extendable antenna of the first example, and numeral 31 denotes a flexible antenna of the second example, all of which are mounted on the upper part of the cab 1 and protrude above the roof. Since these are subject to legal restrictions such as height restrictions during operation, the manually extendable antenna 30 is reduced in size, and the flexible antenna 31 has a foldable structure. Reference numeral 32 denotes an embedded antenna embedded in the rear glass 5 of the cab 1.

[0003]

However, the above configuration has the following problems. In a manually extendable antenna and a flexible antenna, since the antenna is exposed to the outside, there is a possibility that the antenna may be damaged by contact with an external obstacle or the like during work or the like. Since the manually extendable antenna and the flexible antenna protrude from the roof of the driver's cab, the antenna needs to be reduced or collapsed during operation due to height restrictions or the like. Therefore, the operation becomes complicated and the structure becomes complicated. The glass-embedded type is troublesome to replace when it is broken, and the cost is high.

The present invention has been made in view of the above-mentioned problems, has no fear of contact with an external obstacle, does not require a special operation such as retracting an antenna during operation, and can be used in the event of breakage. It is an object of the present invention to provide an inexpensive construction machine antenna device that can be easily replaced.

[0005]

In order to achieve the above object, a first invention is directed to a construction machine provided with a handrail provided for a driver to go up and down to a driver's seat. The handrail is made of a tubular member made of a radio wave transmitting material, and has a configuration in which a radio wave antenna is built in the tubular member.

According to the first invention, since the antenna is built in the cylindrical member of the handrail, it does not come into contact with an external obstacle, and no special operation such as storage during operation is required. Since the tubular member is made of a radio wave transmitting material, there is no possibility of causing radio interference. In addition, replacement at the time of breakage is easy and the cost is low.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an antenna device for a construction machine according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of a cab of a hydraulic shovel provided with an antenna according to the present invention. In FIG. 1, columns 3, 3 for supporting a windshield 2 are provided on the left and right sides of the front surface of a cab 1 mounted on a lower traveling body 5. A door 4 is provided on a side surface of the cab 1, and the door 4 is provided.
A handrail 10 for elevating is attached to the side column 3. The handrail 10 includes a pair of support covers 15, 15 provided oppositely above and below the column 3, and the support covers 15, 15.
And a cylindrical member 16 supported by the support member.

FIG. 2 is a sectional view showing the structure of the upper part of the handrail 10. In FIG. 2, a support bracket 11 is fastened to the column 3 with a screw 12. A hole 13 that penetrates the column 3 is provided at a substantially central portion of the support fitting 11, and a grommet 14 is attached to the hole 13. A support cover 15 is attached to the support fitting 11, and the support cover 1 is provided.
5, a cylindrical member 16 is supported by an interference fit. The tubular member 16 is made of carbon graphite or F
It is made of a radio wave transmitting material such as RP. Tubular member 16
An antenna support plate 20 having a screw portion 21 on the outer peripheral portion is fastened to the upper end of the antenna support plate. An antenna 22 is arranged on the lower surface of the antenna support plate 20 toward the inside of the tubular member 16, and is fixed to the antenna support plate 20 by an antenna connection fitting 23. The antenna cable 24 connected to the antenna 22 exits from the antenna fitting 23, passes through the grommet 14, and is guided into the cab 1.

A handrail 10A as shown in FIG. 3 may be used. The same components as those described in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 3, a support 11B may be provided on the bearing 11A, and the cylindrical member 16 may be directly supported on the support 11B by interference fitting. In this case, since the load of the handrail 10A is not applied to the support cover 15A attached to the support fitting 11A, the strength of the support cover 15A can be reduced.

Since the antenna according to the present invention is constructed as described above, the antenna 22 does not come into contact with an external obstacle to be damaged, and a special operation for lowering the height of the antenna 22 during operation is required. Absent. Since the antenna 22 is built in the radio wave transmitting tubular member 16, there is no possibility of causing radio interference, and the receiving position is high, so that the receiving sensitivity is good. Further, an antenna device for a construction machine which is easy to maintain and replace at the time of failure or the like and is inexpensive can be obtained.

In this embodiment, the number of antennas 22 is one. However, when two antennas are required as in the case of a diversity antenna, the upper and lower support covers 15 are used to make the cylindrical member 1.
6 can be mounted facing each other.

In this embodiment, the handrail 10, 10A is used.
Is installed in the driver's cab 1, but the present invention is applicable to a handrail for raising and lowering the driver's seat even in a vehicle without the driver's cab 1.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cab of a hydraulic shovel having an antenna according to the present invention.

FIG. 2 is a sectional view of a handrail showing an attached state of the antenna of the present invention.

FIG. 3 is a sectional view of a handrail showing an attached state of the antenna of the present invention.

FIG. 4 is a perspective view showing several examples of antennas of a conventional construction machine.

[Explanation of symbols]

1 ... Driver cab, 3 ... Prop, 10,10A ... Handrail, 11,
11A: mounting bracket, 11B: support, 14: grommet, 15, 15A: support cover, 16: tubular member, 20
... Antenna support plate, 22 ... Antenna, 23 ... Antenna fitting, 24 ... Antenna cable.

Claims (1)

[Claims] 1. A construction machine provided with a handrail (10) provided for a driver to ascend and descend to a driver's seat, wherein the handrail (10) is made of a tubular member (16) made of a radio-permeable material. An antenna device for a construction machine, wherein a radio wave antenna (22) is built in the tubular member (16).