Cable drum for automatic rewinding of a cable

Claim 1

A cable drum for automatically rewinding of a cable comprising: restoring spring; a housing holding said restoring spring; a shaft; three disc-shaped walls fastened to said shaft, said shaft extending perpendicular to said walls, said walls defining two winding area means, one of said disc-shaped separating walls being common to both winding areas and having a holding slot for fixing the cable in place; a bushing rotatably carried within a bottom portion of said housing and having a central opening of non-circular cross-section receiving an axially extending protrusion of said shaft having complementary cross-section, an upper portion of the housing being circumferentially connected to said bottom portion, said shaft having an upper trunnion rotatably held in a bore in said upper portion and which completes said bottom portion to form a cylindrically hollow body having a smooth surface; feed-out guide means located within marginal zones of said bottom portion and said upper portion of the housing, one end of said restoring spring being attached to said bottom portion and the other end of said spring being connected to said bushing; said disc-shaped walls comprising cable drum discs connected rigidly to said shaft, said cable drum being prepared for operation by separating the housing portions and removing said cable drum discs, a middle part of the cable to be wound being thereafter pressed into said slot so that a part of the cable is always received by one of said winding area means, one cable end projecting through one exit opening and the other cable end projecting through another exit opening when said cable is substantially wound on the drum so that said cable drum discs are inserted into said bottom portion of the housing, said cable drum being operative after said protrusion of said shaft is inserted into said opening of said bushing and said housing portions are connected.