| 摘要 |
1,246,524. Drilling machines. ATLAS COPCO A.B. 19 Aug., 1969 [10 Sept., 1968], No. 41338/69. Heading B3C. A drilling machine comprises a chuck 15, rotated by a sliding vane air motor 16, and moved at a fast approach rate, and a low drilling rate, by a combined pneumatic and hydraulic feed system 14. A pecking feed is provided by a pneumatic control unit 70. The machine is described in Specification 1,246,523. |
