Patent ID: 7762161

Claim:
A ratchet screwdriver comprising: a handle having a hole co-axially defined therein; a ratchet mechanism co-axially received in the hole in the handle and comprising a ratchet wheel for driving the ratchet screwdriver with bi-directional operations, and a selector mounted on the ratchet mechanism and engaging with the ratchet wheel for selectively determining the operational direction of the ratchet wheel; a driving shaft relatively and co-axially mounted in the ratchet mechanism, and ratchetly and bi-directionally driven by the ratchet wheel; and a locking mechanism made of insulated material and partially longitudinally mounted in the hole in the handle for preventing the driving shaft from detaching from the ratchet screwdriver, the locking mechanism having a protrusion longitudinally extending therefrom for engaging the ratchet wheel, the ratchet wheel having a series of stubs longitudinally extending therefrom and engaged by the protrusion for making click sound when the protrusion flexibly moves over a corresponding one of the series of stubs.