| 摘要 |
PROBLEM TO BE SOLVED: To improve retention volume of a blade having asymmetrical hammer head connection. SOLUTION: The peripheral groove 7 of a disk 12 has an upstream lip 5 and a downstream lip 6, the bearing surface 4a of the upstream lip 5 is connected to the bottom wall 8 of the groove 7 through a circular surface 9a, and in the upstream lip 5, the circle C is formed to draw a crescent shape with a thickness (e), whereby the retention volume of the blade 1 is improved. (a) The connection between the bearing surface 4a of the upstream lip 5 and the bottom wall of the groove 7 is corrected by removing the material from the disk. (b) The disk is fitted to a blade 30 providing each heel 31 with larger volume so that an upstream flank 3a enlarges the value of a radius R and the value of the thickness (e). COPYRIGHT: (C)2005,JPO&NCIPI
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