Abstract:
It is the primary object of the invention to provide an improved structure of a hub, said hub having two cables that are drawn out and recoiled independently thereof; whereby the cable lengths are adjusted in a multitude of stages to the desired length, and means mounted in said hub to smoothly recoil the cables.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to an improved structure of a hub, which is used for the control over drawing out and rolling up the cables of manifold electric devices, computers and communication equipment. 
   2. Description of the Related Art 
   With the ceaseless progression of technology, the structures of computer, electronic and communication equipment are developed to meet the requirements of the present market. However, it is always inconvenient to store the cables of these devices. To solve the problem, various kinds of hubs are provided to collect the cables and control their length during use. 
   Referring to  FIG. 1 , a hub  10  is utilized by pulling out cables  101  at its ends by hand, which is single-staged. That is, the cables  101  are not fixed in place until the both ends are completely drawn out. In order to recoil cables  101 , users need to drag and release cables  101  at two ends simultaneously, and thereby cables  101  are automatically recoiled. Another kind of hub  10  belongs to a multi-staged type, of which cables  101  are drawn out and fixed in multiple stages. Though cables  101  can be fixed in multiple stages while being pulled, it is difficult to define the length of the cables  101  and then readjust. Moreover, it is still unfavorable to pull and drag cables  101  at both ends simultaneously because the process needs to be repeated several times for the entire length of cables  101 . 
   In view of the aforesaid disadvantages, a hub having two cables that can be separately adjusted in multiple stages while pulling out the cables and can be recoiled smoothly is required. Therefore, an improved structure of a hub that satisfies the practical concerns of convenience and utility is investigated and provided in the invention. 
   The aspects of structures, as well as many of the attendant advantages and features of this invention will become more apparent by reference to the following detailed description, when taken in conjunction with the accompanying drawings. 
   SUMMARY OF THE INVENTION 
   It is the primary object of the invention to provide an improved structure of a hub, said hub having two cables that are drawn out and recoiled independently thereof; whereby the cable lengths are adjusted in a multitude of stages to the desired length, and means mounted in said hub to smoothly recoil the cables. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  illustrates operation of a hub according to the prior art. 
       FIG. 2  is an exploded view of a hub according to an embodiment of the invention. 
       FIG. 3  is a perspective view of a rotating disc of a hub according to an embodiment of the invention. 
       FIG. 4  is a perspective view of a button switch device of a hub according to an embodiment of the invention. 
       FIG. 5  shows a rotating disc and a button switch device while pulling out the cables of a hub according to an embodiment of the invention. 
       FIG. 6  shows a rotating disc and a button switch device while recoiling the cables of a hub according to an embodiment of the invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 2  is an exploded diagram of a hub according to an embodiment of the invention, having a socket  20 , a cap  20   a , two rotating discs  30 ,  31 , a reel  50 , and a button switch device  40  as shown. A rotating disc  30  has a reel trench  30   a  therein, a protruding hook support  30   b  and a connecting axis  30   c  disposed in the center to connect with an end of a cable  60  surrounding rotating disc  30 . Ratchets  30   d  are further positioned around the periphery of rotating disc  30 . Referring to  FIG. 3 , rotating disc  31  having an axial through hole  31   c  and a spool  32  extending thereof, in which an opening is deployed to form a hook support  32   a . Axial through hole  31   c  is connected to an end of a cable  61  surrounding rotating disc  31 , and ratchets  31   b  are positioned around the periphery of rotating disc  31 . Reel trench  30   a  of rotating disc  30  is provided for the placement of the reel  50 . One end of the reel  50  clasps a hook support  30   b  of reel trench  30   a , and the other end of reel  50  clasps hook support  32   a  of rotating disc  31  in reference with  FIG. 3 . Connecting axis  30   c  of rotating disc  30  is inserted into axial through hole  31   c  of rotating disc  31  such that cables  60 ,  61  of rotating discs  30 ,  31  are coupled. The resultant structure is arranged over socket  20 , and button switch device  40  is disposed on the side thereof. Cap  20   a  covers the combination, and constitutes a hub  200 . Button switch device  40  ( FIG. 4 ) having two buttons  401 ,  402  thereof, having pivotal arms  401   a ,  402   a , respectively, are intersected. A spring is disposed corresponding to the axial through hole  31   c  and set into the axle center to join buttons  401 ,  402  together. Referring to  FIG. 5 , pivotal arms  401   a ,  402   a  separately obstruct ratchets  30   d ,  31   b  of rotating discs  30 ,  31 , and preventing rotating discs  30 ,  31  from recoiling cables  60 , and  61 . 
     FIG. 5  shows a rotating disc and a button switch device while pulling out the cables of a hub according to an embodiment of the invention. As shown, cable  60  is coiled around rotating disc  30 , whereby cable  60  is drawn out by hand and rotating disc  30  rotates smoothly. (Also referring to  FIG. 2 , reel  50  inside reel trench  30   a  of rotating disc  30  is synchronously turned and constricted.) Cable  60  is released without retardation from pivotal arm  401   a  of button switch device  40 . Cable  60  not being pulled is opposed by tension induced by reel  50  of rotating disc  30  and drives the reverse rotation of rotating disc  30 . As a result, ratchets  30   d  of rotating disc  30  catch pivotal arm  401   a  and ceases to move. 
     FIG. 6  shows a rotating disc and a button switch device while recoiling the cables of a hub according to an embodiment of the invention. As shown, to recoil cable  60 , pivotal arm  401   a  departs from ratchets  30   d  of rotating disc  30  when button  401  of the button switch device  40  is pressed. Accordingly, tension is induced by reel  50  of rotating disc  30  and drives the rotation of rotating disc  30  to recoil cable  60 . 
   Furthermore, the relationship between rotating disc  31  and button switch device  40  during recoiling or drawing out cable  61  is similar to that described in  FIGS. 5 and 6 , which is not disclosed in more detail hereinafter. 
   In accordance with the description above, the hub of the present invention possesses the benefit of drawing out and recoiling a single cable. The structure is not known to the public, and has utility and novelty. It is appreciated if the application is examined and granted. 
   The aforementioned embodiments of the present invention are intended to be illustrative only. It will be apparent to those skilled in the art that numerous alternative embodiments could be made without departing from the scope of the invention.