ANTENNA CABLE BREAK DETECTOR FOR CONSTRUCTION MACHINE WIRELESS COMMUNICATION APPARATUS AND CONSTRUCTION MACHINE WIRELESS COMMUNICATION APPARATUS
First Claim
1. An antenna cable break detector for a construction machine wireless communication apparatus that includes a communication device amounted in a construction machine, an antenna, and an antenna cable, the antenna cable including a central wire and an armor wire that is positioned concentrically outside the central wire, one end each of the central wire and the armor wire being connected to the communication device, the other end of the central wire being connected to the antenna, the other end of the armor wire being grounded, the antenna cable break detector comprising:
- a direct current shutoff device that is connected to the armor wire of the antenna cable to shut off a direct current flow from the armor wire to the communication device; and
current shutoff detection device that is connected to the armor wire of the antenna cable, that applies a direct current to the armor wire from a power supply for detecting a break in the antenna cable, and detects the shutoff of the direct current.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna cable break detector used with a construction machine wireless communication apparatus to detect a break in an antenna cable. The antenna cable 4 includes a central wire 6 and an armor wire 7 that is positioned concentrically outside the central wire. One end of the central wire and the armor wire is connected to a communication device. The other end of the central wire is connected to an antenna 3. The other end of the armor wire is grounded. The antenna cable break detector has a direct current shutoff device that is connected to the armor wire to shut off the flow of direct current 15 from the armor wire to the communication device. There is also a current shutoff detection device that is connected to the armor wire to detect the shutoff of the flow of a direct current the armor wire.
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Citations
4 Claims
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1. An antenna cable break detector for a construction machine wireless communication apparatus that includes a communication device amounted in a construction machine, an antenna, and an antenna cable, the antenna cable including a central wire and an armor wire that is positioned concentrically outside the central wire, one end each of the central wire and the armor wire being connected to the communication device, the other end of the central wire being connected to the antenna, the other end of the armor wire being grounded, the antenna cable break detector comprising:
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a direct current shutoff device that is connected to the armor wire of the antenna cable to shut off a direct current flow from the armor wire to the communication device; and current shutoff detection device that is connected to the armor wire of the antenna cable, that applies a direct current to the armor wire from a power supply for detecting a break in the antenna cable, and detects the shutoff of the direct current. - View Dependent Claims (2, 3)
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4. A construction machine wireless communication apparatus that includes a communication device mounted in a construction machine, an antenna, and an antenna cable, the antenna cable including a central wire and an armor wire that is positioned concentrically outside the central wire, one end each of the central wire and the armor wire being connected to the communication device, the other end of the central wire being connected to the antenna, the other end of the armor wire being grounded, the construction machine wireless communication apparatus further comprising:
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an antenna cable break detector for detecting a break in the antenna cable; wherein the antenna cable break detector includes a direct current shutoff device that is connected to the armor wire of the antenna cable to shut off a direct current flow from the armor wire to the communication device, and a current shutoff detection device that is connected to the armor wire of the antenna cable, that applies a direct current to the armor wire from a power supply for detecting a break in the antenna cable, and detects the shutoff of the direct current.
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Specification