Wire-winding device with smooth outlets

Abstract

A wire-winding device with smooth outlets comprises an upper cover; a lower cover; a rotary unit; a wire winding around the rotary unit; two sliding units installed at two ends of the wire-winding device and at the inner sides of the upper cover and lower cover; each sliding unit having two retaining shafts and two hollow rollers; two retaining shafts of one sliding unit being installed at one end of the lower cover; each retaining shaft being installed with a hollow roller; the upper cover having two retaining holes corresponding to the two retaining shafts of the lower cover; and a via hole being formed between two hollow rollers so that the wire passes through the via hole to protrude out of the wire-winding device.

1 . A wire-winding device with smooth outlets comprising: 
 an upper cover having a round central portion and two extending portion symmetrically extending from an upper side and a lower side of a round portion;    a lower cover having a round central portion and two extending portion symmetrically extending from an upper side and a lower side of a round portion;    a rotary unit installed between the upper cover and the lower cover;    a wire winding around the rotary unit;    two sliding units installed at the two extending portions of the upper cover and lower cover;    each sliding unit including: 
 two round cylindrical retaining shafts; two retaining shafts of one sliding unit being installed at one end of the lower cover;  
 each retaining shaft being installed with a round cylindrical hollow roller;  
 the upper cover having two round cylindrical retaining holes corresponding to the two retaining shafts of the lower cover; and  
 a via hole being formed between two hollow rollers so that the wire passes through the via hole to protrude out of the wire-winding device;  
   wherein when the upper cover is combined to the lower cover, the retaining shafts of the lower cover are engaged to the corresponding retaining holes of the upper cover so that the two hollow rollers are rotatable along the two retaining shafts, respectively; thus, by the rolling of the two hollow rollers, the wire can be received in or pulled out of the wire-winding device so that the wire can slide smoothly.    
   
   
       2 . The wire-winding device with smooth outlets as claimed in  claim 1 , wherein two ends of the wire are connected with respective devices.