Abstract:
A positioning device for a reel is disclosed. The positioning device contains a spring-loaded reeling disc, wherein when the cable or wire is pulled to rotate for a half round, a positioning mechanism is made. A button is used to control either a single step or multiple steps retraction of the cable or wire.

Description:
BACKGROUND OF THE INVENTION 
   (a) Technical Field of the Invention 
   The present invention relates to a reel for cable-reeling or wire-reeling, and in particular to a positioning device for a reel. The reel allows cable or wire to be retracted to the reel neatly. 
   (b) Description of the Prior Art 
     FIGS. 1 and 2  show a conventional reel A 10  comprising a front cover A 1 , a rotating spring A 2 , a sliding seat A 3 , a transmission wire A 4 , a positioning bead A 5  and a rear cover A 6 . The rotating spring retracts the transmission wire A 4  and a positioning mechanism employing the steel bead A 5  to position the wire A 4 . A steel bead rail A 31  is provided to allow the movement of the steel bead A 5 . The conventional structure requires very precise dimension and therefore fabrication of a mold for such structure is difficult, and the cost of fabrication is high. Further, the wear of the rail A 31  or the big gap formed on the rail A 31  will cause a failure in positioning. Therefore, the conventional reel A 10  is frequently dislocated or cannot be positioned. In addition, the steel bead used for positioning will not allow step by step retraction of the wire, the positioning of the wire is not accurate and only one round is made, otherwise positioning is not possible. This will cause either the cable is too long or too short. 
   Accordingly, it is an object of the preset invention to provide a positioning device for a reel which mitigates the above drawbacks. 
   SUMMARY OF THE INVENTION 
   An object of the present invention is to provide a positioning device for a reel operated with button comprising a top cover, a press button, a partition plate, a reel plate, a wire, a rotating spring and a bottom cover, wherein the top cover is provided at a center hole having a bottom inner edge provided with a first stepped level and a second stepped level, the first stepped level has an engaging slot for the mounting of the press button and the positioning of the engaging wings, and the second stepped level is for the insertion of the partition plate for securing; the press button is positioned within the first stepped level and is at the engaging slot of the first stepped level, and the bottom section of the press button has a corresponding spring having a gap with the partition plate, and the external edge of the bottom section has a pressing peg corresponding to the through slot at the lower section of the partition plate; the partition plate is positioned within the second stepped level and has a bottom face with a center for the position of the center shaft of the bottom cover, and the external edge has a through slot with a top section corresponding to the press peg of the press key and the bottom section is for the engagement of the spring-loaded peg, and therefore one side of the through slot is a slanting face, and the other side is a vertical face; a rotating plate has a clip plate or clip mouth and the inner bottom of the external edge is a spring loaded-peg slot for mounting of a peg, a spring and a sealing plate, and the peg has a slanting face at the corner corresponding to the slanting face at one side of the peg slot of the partition plate; the wire rotates along the outer edge of the rotating plate and is divided into a top position and a bottom position, the rotating spring having a center end is connected to the engaging slot at the center shaft of the inner section of the bottom cover and is secured, the external end is hooked to the engaging slot of the rotating plate, and the bottom cover matches the top cover and the center shaft is provided with an engaging slot for the insertion of the center end of the rotating spring. 
   Yet a further object of the present invention is to provide a positioning device for a reel, wherein the wire or cable can be fully retracted to the reel. 
   Still another object of the present invention is to provide a positioning device for a reel, wherein appropriate length after pulled or retracted could be secured precisely. 
   Another object of the present invention is to provide a positioning device for a reel, wherein the pulling or retraction of the wire or cable is precise. 
   Yet another object of the present invention is to provide a positioning device for a reel, wherein the pulling or retraction of wire/or cable is quick and simple and the wire or cable can be pulled or retracted in one step or in multiple steps. 
   Still a further object of the present invention is to provide a positioning device for a reel, wherein the assembly can be easily and quickly installed. 
   The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. 
   Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an exploded perspective view of a conventional reel employing steel bead for positioning. 
       FIG. 2  is a perspective view of the bottom section of the sliding seat of the conventional reel. 
       FIG. 3  is a perspective view of the preferred embodiment in accordance with the present invention. 
       FIG. 4  is an exploded view of the reel showing the individual components. 
       FIG. 5  is a schematic view showing the bottom section of the top cover of the present invention. 
       FIG. 6  is a schematic view showing the bottom section of the partition plate of the present invention. 
       FIG. 7  is a schematic view showing the bottom section of the button of the present invention. 
       FIG. 8  is a schematic view showing the flat structure of the peg in accordance with the present invention. 
       FIG. 9  is a schematic view showing the bottom structure of the reel of the present invention. 
       FIG. 10  is a schematic view showing the operation of the reel in accordance with the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims. 
   Referring to  FIGS. 3 and 4 , the positioning device for a reel operated with button comprising a top cover  1 , a press button  2 , a partition plate  3 , a rotating plate  4 , a wire  5 , a rotating spring  6  and a bottom cover  7 , wherein the top cover  1  is provided with a center hole  11  similar to the press button  2  for the mounting of the press button  2 . As shown in  FIG. 5 , the bottom inner edge of the center hole  11  is provided with the first level  111  and a second stepped level  113 . The first stepped level  111  has an engaging slot  112  for the mounting of the press button  2  and the positioning of the engaging wings  21 , and the second stepped level  113  is for the insertion of the partition plate  3  for securing. Thus, bottom edge of the press button  2  and the partition plate  3  form a narrow gap by means of a spring  22 , which is the distance the button  2  is depressed, as shown in  FIG. 10 . The press button  2  is positioned within the first stepped level  111  and is at the engaging slot of the first stepped level  111 , and the bottom section of the press button  2  has a corresponding spring having a gap with the partition plate, and the external edge of the bottom section has a pressing peg  24  corresponding to the through slot  31  at the lower section of the partition plate  3  as shown in  FIGS. 6 and 10 . 
   As shown in  FIG. 6 , the partition plate  3  has a positioning slot  32  for the center shaft  71  of the bottom cover  7  and the external edge has a through slot  31  with a top section corresponding to the press peg of the press key and the bottom section is for the engagement of the spring-loaded peg  41 . One side of the through slot  31  has a slanting face  311 , and the other side has a vertical face  312 . The rotating plate  4 , as shown in  FIG. 9 , has a clip plate or clip mouth  44  and the inner bottom of the external edge has a spring loaded-peg slot  45  for mounting of a peg  46 , a spring  47  and a sealing plate  48 . As shown in  FIG. 8 , the peg  46  has a slanting face  461  at the corner corresponding to the slanting face  461  at one side of the through slot  31  of the partition plate  3 . The wire  5  rotates along the outer edge of the rotating plate  4  and is divided into a top position and a bottom position. The rotating spring  6 , as shown in  FIG. 4 , has a center end connected to the engaging slot  711  at the center shaft  71  of the inner section of the bottom cover  7  and is secured. The external end is hooked to the engaging slot  49  of the rotating plate  4 , and the bottom cover  7  matches the top cover  1  and the center shaft  71  is provided with an engaging slot  49  for the insertion of the center end of the rotating spring  6 . 
   As shown in  FIG. 10 , when the wire  5  is to be pulled out from the reel of the present invention, the rotating plate  4  rotates and the spring-loaded peg  41  will pass through smoothly the slanting face  311  at one side of the peg  31 . Thus, the wire  5  will be pulled out smoothly when the wire  5  is to be retracted, the button  2  is depressed, the press peg  24  passes through the peg slot  31  and the spring-load peg  41  is depressed, and the rotating plate  4  rotates by means of the spring. Thus, the button  2  is used to provide a single retraction or multiple retractions. 
   It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
   While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.