Patent ID: 8453634

Claim:
An initial velocity accelerating tube mounted at a front end of a barrel of a toy gun, comprising: an outer pipe having a first opening and a second opening at two ends thereof; a stop member disposed at the first opening of the outer pipe, the stop member having an axial hole; a connection member disposed at the second opening of the outer pipe, the connection member having a through hole corresponding to the axial hole of the stop member, the connection member further including a connection portion to connect with the toy gun; an inner pipe disposed in the outer pipe, two ends of the inner pipe being respectively inserted in the axial hole and the through hole, the inner pipe including a first limit member an outer wall thereof close to the stop member and a second limit member on the outer wall close to the connection member; the outer wall of the inner pipe has a first annular groove corresponding to the first limit member and a second annular groove corresponding to the second limit member, the first limit member and the second limit member having a C-like shape and being engaged in the first annular groove and the second annular groove; an elastic member disposed on the inner pipe and located between the first limit member and the stop member; and the elastic member is a spring fitted on the inner pipe.