| 摘要 |
1,222,338. Tool-bits. HILTI A.G. 6 Feb., 1969 [10 April, 1968], No. 6588/69. Heading B4C. A tool 1 is held in a hammer drill's toolholder by locking cylinder(s) (not shown) engaging in closed-ended slats 9 of arcuate section in the tool's shank 4. These slats have optimum dimensions, i.e. a radius of 25-35% of the shanks diameter, a depth of 12-20% of the shanks diameter and a length 10-15% longer than the length of the locking cylinders. Wider ranges are given in the Specification. Specification 1,194,103 is referred to. |
