| 摘要 |
PROBLEM TO BE SOLVED: To resolve complexity of costs and processing of a drive mechanism. SOLUTION: This hollow piston drive mechanism of a hammer drill comprises a crank pin 54 having a cylindrical link member 68 tightly connected with a partly spherical bearing 70. The partly spherical bearing 70 is slidably and rotatably arranged to a partly spherical indented part 72 formed in a crank plate 52. The cylindrical link member 68 is slidably arranged in the cylindrical bearing 56 formed at an end of the hollow piston 58. A cylindrical collar member 74 is mounted on the cylindrical link member 68 of the crank pin 54. The cylindrical collar member 74 can be mounted on the crank pin 54 after an assembly of the crank plate 52 and the crank pin 54 is assembled. COPYRIGHT: (C)2006,JPO&NCIPI
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