| 摘要 |
<p>1,140,842. Cutting tools. PRODUCTION ENG. RESEARCH ASSOCIATION OF GREAT BRITAIN. 21 Jan., 1966 [1 Nov., 1965], No. 36057/68. Divided out of 1,140,841. Headings B3B, B3K and B3L. A reversible and indexable cutting bit of slice-like form for use in turning, milling and planing which has a central hole and a plurality of similar distinct cutting edges around its periphery radially spaced from the central hole. Each cutting edge has a convex outline and a contour whereby the angle between the end of a cutting edge and a radius from the centre of the bit through the most prominent part of the cutting edge is not less than 30 degrees.</p> |
