Patent ID: 7398712

Claim:
A rotary impact tool comprising: a driving portion; a body extending from a lower side of the driving portion; an axial portion extending from a lower side of the body; a through hole being formed in the axial portion for receiving a bar to provide an arm of force in operation; a lower periphery of the axial portion being formed with a thread portion an engaging unit engaged with the thread portion of the axial portion; in assembly, the axial portion being screwed to the engaging unit; an impact portion; a lateral side of the engaging unit being formed with a first insertion hole for receiving an insertion unit; a lower side of the impact portion being formed with a receiving hole; a stop unit being received in the receiving hole; a lateral side of the impact portion being formed with a second insertion hole; and an insertion unit being received in the second insertion hole; a flange extending from an upper periphery of the stop unit resting against an inner wall of the receiving hole of the impact portion so that a magnetic unit will not protrude out from the receiving hole; a magnetic unit being received in the stop unit; and an upper inner wall of the impact portion being formed with the second insertion hole; the impact portion being rotatable with respect to the engaging unit; the engaging unit being combined with the axial portion so that the impact portion is rotatale with respect to the axial portion to form a pivotal rotatable impact portion; and wherein the engaging unit is screwed to the thread portion of the axial portion; the impact portion is rotatable with respect to the engaging unit; when the insertion unit is received in the second insertion hole of the impact portion, the impact portion passes through the second insertion hole to be assembled to the first insertion hole so that the impact portion is combined with the engaging unit; when the engaging unit is screwed to the axial portion, if the user rotates the impact portion and thus the engaging unit rotates, the engaging unit, magnetic unit, and the impact portion can be screwed and detached.