US Patent 6860489 Chuck device

A chuck includes a socket, an elastic detent and a sleeve. The socket includes a hole defined axially therein, an upper slot cut therein and a lower slot cut therein. The elastic detent includes an upper transverse section and a lower transverse section. The elastic detent is mounted on the socket so that the upper transverse section of the elastic detent enters the hole through the upper slot and that the lower transverse section of the elastic detent enters the hole through the lower slot. The sleeve includes an annular flange formed on an internal face. The sleeve can be moved on the socket so that the annular flange can move the upper and lower transverse sections from the hole along the upper and lower slots, respectively.