| 摘要 |
A screwdriver has a socket seat, an inner shaft and an outer shaft. The socket seat has an outer wall, a circular crenulation, a central hole, a circular interspace and enlarged blocks. The inner surface of the circular crenulation has three check recesses between two enlarged blocks. The inner shaft has an upper portion in the socket seat and a lower rod. The upper portion of the inner shaft is checked by the inner surface of the socket seat. A positioning portion which is disposed on the upper portion of the inner shaft has spaced flat surfaces and spaced outcurved surfaces formed on the outer periphery alternately. A radial hole is formed on the positioning portion to receive a steel ball which is suppressed by a spring. The steel ball is disposed in any of the check recesses. Each enlarged block is adjacent to a cylindrical check block. A circular cushion is disposed on the check block. An outer shaft has a rod and a circular flange to seal the circular interspace.
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