Patent ID: 7581468
Filing Date: 2009-09-01
Classification: B25B

Abstract:
1. An angle adjustable hand tool comprising: a handle having a first connection end and a first hole defined axially in the first connection end, a second hole defined in the first connection end and perpendicularly communicating with the first hole, two respective springs received in the first and second holes respectively; a driving head having a driving member and a second connection end which is pivotably connected to the first connection end and includes a first engagement end having teeth defined therein; a pawl movably received in the first hole and having a second engagement end which is removably engaged with the teeth of the first engagement end, at least one first flat surface defined in a shank of the pawl and a first contact surface connected to the first flat surface; a button engaged with the second hole and including at least one second flat surface which is matched with the first flat surface of the pawl, a recess defined in the button and located substantially perpendicular to the at least one second flat surface, a second contact surface connected to the recess, when the button is pushed, the second contact surface being disengaged from the first contact surface and the pawl is then located in the recess of the button so that the driving head is pivoted and the first engagement end of the driving head moves over the second engagement end of the pawl to adjust the angle of the driving head relative to the handle, the second engagement end of the pawl is engaged with the first engagement end again when releasing the button; wherein a second guide surface is connected between the recess and the second contact surface; wherein the second guide surface is a curved and convex surface.