Patent ID: 6155143
Filing Date: 2000-12-05
Classification: B25B,B25G

Abstract:
A screwdriver having extending and retracting action, comprising:a handle; a duct disposed in the handle and extending from the front end of the handle along the axial direction of the handle;a shank having at the front a head for driving a fastening element, the shank being put in the duct to extend and retract along the duct; the shank having a rod body of a cross section of a predetermined length in the predetermined geometrical form, and capable of being driven to turn by the handle;an elastic element disposed in the handle and located between the handle and the shank, the elasticity of the element capable of keeping the shank in the state of being pushed out of the handle;a retaining device disposed in the handle and adjustably retaining the shank at any position along the length thereof; the retaining device capable of being operated and controlled manually, so as to relieve the shank of the retaining state.