Abstract: An expandable baton includes an internally threaded first tube; a first inner support tube disposed in the first tube and including first external threads secured to the internal threads of the first tube; a second inner support tube spaced from the first inner support tube with a first annular groove formed between them; a second lock mechanism at a first end of the second tube; a first lock mechanism at a first end of the first tube; a release mechanism including an axially moveable lock needle having a pointed second end, a pushbutton and a spring, a pressing of the pushbutton moves the lock needle to either insert into or disengage from the second lock mechanism, thereby unlocking the second lock protuberances or locking same; and a positioning member for limiting the release mechanism.

Abstract: An expandable baton includes an internally threaded first tube; a first inner support tube disposed in the first tube and including first external threads secured to the internal threads of the first tube; a second inner support tube spaced from the first inner support tube with a first annular groove formed between them; a second lock mechanism at a first end of the second tube and including two second lock protuberances and a second externally threaded connection wherein the second externally threaded connection includes a second shoulder; a release mechanism including an axially moveable lock needle having a pointed second end and a pushbutton at a first end, a pressing of the pushbutton moves the lock needle to either insert into or disengage from the second lock mechanism, thereby unlocking the second lock protuberances or locking same; and a positioning member for limiting the release mechanism.

Abstract: An expandable baton includes a first tube; a second tube disposed in the first tube; at least one lock mechanism disposed on a first end of the second tube, clamped to an inner surface of the first tube and including a locking pipe, two lock protuberances and two elastic members, the lock protuberances correspondent to each other and the elastic members disposed between the two lock protuberances; a release mechanism including a lock needle and a pushbutton, a pressing of the pushbutton moves the lock needle to insert into the lock mechanism, the lock protuberances depart from the first tube simultaneously and urge the elastic members to an unlocked position, without a pressing of the pushbutton, the restored elastic members enable the lock protuberances to a locked position; and a positioning member for limiting the release mechanism at a first end of the first tube.