| 摘要 |
PURPOSE:To improve the workability and accuracy of angle detection and to simplify a titled device by combining a magne-scale which moves together with a boom, and a detector which stays still in a constant position in spite of the depression and elevation of the boom. CONSTITUTION:While a rocket 5 and a boom 3 are in a vertical state, a detector 15 is in the position corresponding to the point (a) of a mange-scale 14, thereby detecting that the boom 3 is in the vertical state. When the rocket 5 and the boom 3 make depression or elevation movement, a stationary plate 12 displaces relatively by an angle alpha, that is, the angle of elevation. On the other hand, a static member 11 does not move despite the depression or elevation of the boom 3 and therefore the position of the detector 15 corresponding to said scale moves from the point (a) to (b). The rate of this displacement is detected with the detector 15, and the angle of elevation is operated and displayed. Thereby, the workability and accuracy of the angle detection are improved and the device is simplified. |
