Electric box for connection between a handset and a telephone base

Claim 1

An electric box connected between a telephone base and a handset, comprising: a housing having a cable hole, said housing comprised of a bottom shell and a cover shell placed on said bottom shell, said bottom shell comprising a hollow upright shaft on an inside at a center, and a split upright stub tube spaced around said upright shaft, said cover shell having a plurality of through holes; a rotary member mounted inside said housing and turned about said upright shaft of said bottom shell, said rotary member comprising a bottom chamber, a partition wall, a top chamber separated from said bottom chamber by said partition wall, an axle hole at a center of said partition wall which receives the upright shaft of said bottom shell, a slot and a notch at a periphery; a spiral spring mounted in said bottom chamber of said rotary member, having a hooked inner end fastened to a split of said split upright stub tube of said bottom shell and a hooked outer end fastened to the notch of said rotary member; a metal ring holder mounted in said top chamber of said rotary member and having a plurality of circular grooves of different diameters concentrically disposed at a top side; a flat cable wound around said rotary chamber, having one end inserted into the slot of said rotary member and connected to said metal ring holder and an opposite end extended out of the cable hole of said housing and mounted with a first module plug for connection to said handset; a plurality of metal rings respectively mounted in the circular grooves of said metal ring holder, having a respective pointed tip raised from a ring periphery and forced into contact with respective conductors in said flat cable; a plurality of metal springs respectively mounted in the through holes of said cover shell and disposed in contact with said metal rings; a plurality of terminals respectively supported on said metal springs in the through holes of said cover shell; a mounting block mounted on said cover shell; and a second module plug mounted on said mounting block for connection to said telephone base, having contacts respectively disposed in contact with said terminals.