A MULTISTAGE BOLT SOCKET

PROBLEM TO BE SOLVED: To solve a problem that a conventional multistage type socket integrating sockets different in diameter takes time to displace additional sockets, that durability of the additional sockets is short, that the inside socket runs idle when it is fastened with an impact driver, etc. and that it is impossible to integrate more than three kinds of the sockets because of these reverse functions. SOLUTION: It is possible to always set the sockets at a head end part of the bolt to be a target, to prevent idle running and to integrate up to two to five kinds of the sockets by forming the smallest socket on a main body and the larger sockets sequentially on a movable part by forming a storage part of a spring semicircular on the inside and the outside of the socket. COPYRIGHT: (C)2008,JPO&INPIT