| 摘要 |
PURPOSE:To confirm a position of a worker having a transponder through conversation, to complement a state of erroneous measurement in distance measurement, and to use the transponder as an alarming means. CONSTITUTION:A transceiver 10 is fitted to a rear part of a hydraulic excavator 1, while a transponder 20 is fitted to a helmet of a worker 2. The transceiver 10 is provided with a calculating circuit for measuring a distance D0 to the transponder 20, and transmits the calculated distance D0 to a control device 4 in an operator stand 3. The control device 4 compares the distance D0 with a specified reference value, and when the transponder 20 is approaching more than a specified distance, drives an alarm device in the operator stand 3 of the hydraulic excavator 1 wherein an operator is present to display a danger on a display equipped on the operator stand 3. |
