Patent ID: 7509893
Filing Date: 2009-03-31
Classification: B25B

Abstract:
1. A hand tool comprising: a handle having a yoke on one end thereof and a space defined between two lugs of the yoke, a recess defined in one side of the handle and a first passage defined longitudinally in an inside of the yoke, the recess communicating with the passage; a switch member having a shank which is rotatably inserted in the recess and includes a convex and curved surface and a flat surface defined in an outer periphery thereof, a lever extending from a top of the shank and located on the side of the handle; a pawl set including a pawl and a first spring, the pawl having pawl teeth defined in a first end thereof, the first spring mounted to the pawl and applied a force to push the pawl toward the shank of the switch member, a second end of the pawl movably in contact with the outer periphery of the shank, and a tool head having an operation end and an insertion on two opposite ends thereof, the insertion pivotbaly engaged with the space of the yoke and having engaging teeth, the pawl teeth being pushed to engage with the engaging teeth of the insertion when the second end of the pawl is pushed by the convex and curved surface of the shank, the pawl teeth being removed from the engaging teeth of the insertion when the second end of the pawl is in contact with the flat surface of the shank.