Patent ID: 7357666

Claim:
A cable winder, comprising: an upper shell provided with retaining slots and retaining columns on an inner wall of the upper shell; a lower shell covering a lower half of said cable winder, said lower shell having a cable outlet and a central shaft extending upright on an inner wall of the lower shell; a clamping part retained by said retaining slots of said upper shell; a rail mount provided with a spiral rail having a retaining slot, one end of said clamping part being slidably embedded in said spiral rail, said retaining slot of said spiral rail stopping said clamping part when said clamping part slides into said retaining slot; a rotary tray having a central through hole of passing said shaft of said lower shell, an upper receptacle and a lower receptacle; a spiral spring mounted within said upper receptacle of said rotary tray, a middle point of said spiral spring being fixed by a notch on said shaft of said lower shell, whereby said spiral spring will provide a restoring force against the movement of said rotary tray; and a signal transmission cable, a first section of said cable being wound several times around said shaft within an inner part of said lower receptacle of said rotary tray and being fixed by the retaining column, whereby a first terminal will be extended outside said lower shell along said shaft, a second section of said cable being wound several times in an opposite direction to said first section around said shaft within an outer part of said lower receptacle of said lower shell, a second terminal of said second section being extended out of said lower shell through said cable outlet, said first and second terminals being capable of being installed with a connector; whereby said rotary tray, together with said spiral spring and said signal transmission cable, will be retained between said upper and said lower shells, and whereby said first section of said cable in said inner part of said lower receptacle will be loosened when said second section of said cable in said outer part is pull out of said lower receptacle and said first section of said cable in said inner part of said lower receptacle will be tightened when said second section of said cable in said outer part is retracted into said lower receptacle, and whereby a section of said cable pulled out of said lower shell will maintain a fixed length due to said clamping part being retained within said retaining slot in said spiral rail on said rail mount after said clamping part slides over a fixed distance.