| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless control antenna of a crane for protecting a cable by reducing influence of a metal obstacle upon an electromagnetic wave and optimizing the function of wireless control by minimizing interception of different type. SOLUTION: A support arm of the wireless control antenna 6 is installed to point to a specified direction in the periphery of a vertical rotation axis in a lifting apparatus 2. The support arm 5 includes a head 10 deflecting in the radiating direction with respect to the axis 11, and the antenna 6 is installed on the head. Accordingly, the support arm 5 can takes two separation angular positions A, B, in particular the position of separating the antenna from a metal structure part of the lifting apparatus. COPYRIGHT: (C)2004,JPO
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