| 摘要 |
PURPOSE: To provide a simple device for securely switching the number of revolution of a drilling device. CONSTITUTION: A drilling device having a switching device is provided with a rotatable handle 6 having a switching cam 9 for selectively adjusting the various number of revolution. A spring curved member 14 to be latched with the handle 6 is provided at each working position, and this spring curved member can be rotated in relation to a machine frame by the handle 6. Ends 14a, 14b of the spring curved member 14 are rushed into latch openings 1d, 1e of a bolt 1a provided in the machine frame and to be used for supporting the rotation of the handle 6. |
