| 摘要 |
<p>1,159,827. Machine tool details. HEALD MACHINE CO. 23 Aug., 1966 [7 Sept., 1965], No. 37738/66. Headings B3B and B3C. A boring machine comprises a base 11, a work support 17, and a boring bar 16 driven by a motor 14, and carried by a slide 13, which can be moved at a fast approach and retraction speed and at a slower feed rate, by an hydraulic piston 23. The latter is controlled by a directionregulation valve 32, an adjustable pressureregulating valve 61, and an adjustable flowregulating valve 33.</p> |
