| 摘要 |
The operator and service platform (40) is supported displaceably relatively to the drive frame in the direction of the guides (4) between a lower position in which it does not obstruct the work movements of the drilling boom unit (62), and an upper position in which the drilling boom unit in the collapsed inactive position extends through an aperture in the operator and service platform (40). The drive frame supports at qual distances from the guides (4) two parallel guide beams (26) for the movement of the operator platform, and which form a guide for each parallel platform support beam (42). These beams (42) support at their upper end the operator platform, and drive units (80,82) are provided for moving the support beams along the guide beams (26). A protective roof (72) is fitted rotatably on a platform column (70) which is adjustable around an articulated shaft (76) running in the direction of the guides. The column is connected to the shaft via an arm (74). The guides support two parallel cog or pin rod tracks, with each of which two drives (10) work. |
