| 摘要 |
A ratchet screwdriver includes a first tubular member with an open end and a closed end. A bore extends from the open end towards the closed end. The inner side of the closed end has a recessed groove and the outer side of the same is connected to a handle. The wall of the first tubular member has a thorugh-hole therein into which two annular projections extend. A second tubular member has an open end and a closed end. A second bore for carrying a bit, extends from the open end towards the closed end of the same. A ratchet wheel with a shaft is co-axially mounted on the closed end of the second member, when fit in the bore of the first member the shaft is journalled in the recessed groove of the closed end of the first member. A locking mechanism baised by spring member, is mounted on the first member, and disposed in the through-hole of the first member, the lower end of which having an oblique side extending into a notch formed between two adjacent teeth of the ratchet wheel.
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