Patent attributes
A central lock comprises a center pole (2), a center top cap (1), and a center bottom cap (3). A locking piece (4) is received in the center bottom cap (3); a first through hole (41) is provided in the locking piece (4); and the end part of the center pole (2) is provided with a clamping groove (21) and a clamp locking part (22) located at the lower end of the clamping groove (21). When the central lock is in a locked state, the locking piece (4) is clamped with the clamping groove (21) of the center pole (2), and the locking part (22) abuts against a lower end surface of the locking piece (4); and when the central lock is in an unlocked state, the locking piece (4) is separated from the clamping groove (21), and the clamp locking part (22) can pass through the first through hole (41).
