Abstract:
A hinge apparatus for a mobile terminal, and more particularly, to a hinge apparatus for a mobile terminal is provided, which prevents a hinge from overlapping when a housing is folded to optimize the application of space in a display region and a keypad region and realize a miniaturized and slim device.

Description:
BACKGROUND 
       [0001]    The present invention relates, in general, to a hinge apparatus for a mobile terminal and, more particularly, to a hinge apparatus for a mobile terminal, which prevents a hinge from overlapping when a housing is folded, thus maximizing the display region of a body and a folder, in addition to realizing the miniaturization and slimness of a device. 
         [0002]    With the rapid growth IT technology and the explosion of digital information accessible via the Internet and the like, a mobile terminal such as a cell phone requires high performance and convenient portability. To this end, the miniaturization and slimness of a device are being actively pursued. 
         [0003]    For example, the mobile terminal starting from a bar type sequentially developed into a flip type, a folder type and a slide type. Currently, the general form-factor trend of mobile terminals is a bar type smartphone equipped with a large display. 
         [0004]    In this context, the above-described folder type mobile terminal refers to a mobile terminal which is configured such that a display housing is unfolded or folded with respect to a side of a main housing. A hinge structure of the folder type mobile terminal will be described below in brief. 
         [0005]      FIG. 1  is a perspective view showing a conventional hinge structure of a mobile terminal. As shown in  FIG. 1 , the conventional hinge structure of the mobile terminal is composed of a combination of a main housing  910  and a hinge apparatus  930 . Various hardware components required to operate a device are accommodated in the main housing  910 , with a keypad  911  mounted on a surface of the main housing to input text. The hinge apparatus  930  is assembled with the main housing  910  and a display housing  920 , and is used to fold the display housing  920 . 
         [0006]    According to the related art, the display housing  920  rotates about the hinge apparatus  930  to be unfolded and thereby exposes a display module  921  and the keypad  911  to the outside. In such a state, text is input using the keypad  911  to allow a user to conveniently monitor and use several functions of the terminal, such as making or receiving a phone call, sending a text message, or accessing the internet. 
         [0007]    However, in order to achieve the above-described folder type structure, the above hinge apparatus  930  should be essentially provided. Thus, each of the main housing  910  and the display housing  920  requires an additional space to be assembled with the hinge apparatus  930 . 
         [0008]    For this reason, portions of the main housing  910  and the display housing  920  inevitably overlap each other, so that a region for placing the keypad  911  and the display module  921  may undesirably become narrow. 
         [0009]    Moreover, the assembled hinge apparatus  930  causes portion of the main housing  910  to protrude out, so that a valley portion around the hinge apparatus is exposed, thereby marring the appearance of the device. As a result, this imposes restrictions on the miniaturization and slimness of the mobile terminal. 
       SUMMARY OF THE INVENTION 
       [0010]    Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, and is intended to provide a hinge apparatus for a mobile terminal, which includes a slider that may move along a predetermined orbit from an interior of a main housing when a display housing is folded, thus preventing portions of the display housing and the main housing from overlapping each other and thereby realizing an unfolded state along an extrapolated line. 
         [0011]    Further, the present invention provides a hinge apparatus for a mobile terminal, which further includes a tension band having a predetermined tension, thus allowing a slider to be smoothly received in a main housing when a display housing is folded. 
         [0012]    In an aspect, the present invention provides a hinge apparatus for a mobile terminal configured to fold a display housing from a side of a main housing, the hinge apparatus including: 
         [0013]    a slider accommodated in the side of the main housing to repeatedly perform a movement along a curved orbit in conjunction with folding of the display housing; a barrel integrally attached to the display housing and hinged to an end of the slider to enable rotation of the display housing; a cycle attachment provided in the main housing to assist the movement of the slider and rotation of the barrel induced by the movement of the slider; and a bonding assembly assembled with the slider, the barrel and the cycle attachment, and serving to guide the movement of the slider, wherein the barrel includes a rotating shaft protruding from an end in a longitudinal direction of the barrel to rotate the display housing, and a free-stop hinge provided on an opposite end of the barrel to prevent an idle movement of the barrel immediately after the display housing is folded or unfolded, and a pulley having a band ring is provided on the rotating shaft of the barrel, and a tension band is wound on the pulley of the rotating shaft of the barrel to provide tension for drawing the slider into the main housing while the display housing is folded. 
         [0014]    The hinge apparatus may further include a torsion spring provided between a base plate and a rear portion of the slider, the torsion spring biasing the slider in an ejecting direction when the slider is in a fully ejected position and biasing the slider in a receiving direction when the slider is in a fully received position, the torsion spring being set in a neutral position where the torsion spring does not apply a force in any direction while the slider is moving. 
         [0015]    The cycle attachment may include guide pins hinged to the bonding assembly and protruding from both sides of the rear portion of the slider to control an orbit of the rear portion of the slider; guideway grooves attached to left and right sides of the base plate, and each having a curved trajectory groove to guide the corresponding guide pin; and a plurality of swing arms hinged to the bonding assembly to control the movement of the slider and an orbit of a front portion of the slider. 
         [0016]    The hinge apparatus may further include a stabilizer hinged at a central portion thereof to the base plate of the bonding assembly and performing a radial rotation with respect to the hinged central portion, both ends of the stabilizer being bent twice at a right angle; and links provided on the both ends of the stabilizer shaft, and having two articulations to be hinged to the guide pins of the rear portion of the slider, thus allowing left and right moving distances of the slider to be kept equal during the movement of the slider. 
         [0017]    The free-stop hinge may include the tension band wound between the spring and an S cam and A cam combination, and the pulley equipped with the ring for holding the tension band, thus preventing an idle movement of the display housing when being folded or unfolded. 
         [0018]    The bonding assembly may include a base plate secured to an inner wall of an upper portion of the main housing; a bracket plate attached to a central portion of a lower surface of the base plate in such a way as to be in close contact therewith, thus causing the stabilizer and the torsion spring to be hinged; and a plurality of guideway brackets fastened to both edges of the lower surface of the base plate, thus allowing the slider to be placed under the base plate and guiding the movement of the slider in conjunction with the folding of the display housing. 
         [0019]    The torsion spring may include a spring shaft coupled to prevent a coil portion from being deformed when a repulsive force is generated by a torsion moment; an upper joint provided between a rotating shaft of the spring on the base plate and the spring shaft, the upper joint having on both ends thereof rotating-shaft holes; and a lower joint provided between the spring shaft and a spring axle, the lower joint having on both ends thereof rotating-shaft holes. 
         [0020]    The base plate may include a follow projection projecting downwards from a lower surface of an end of a front portion thereof to define a rotating angle of the display housing; and an arm bearing provided on an upper portion of a front portion of each of the guideway brackets attached to both ends of the base plate to render an end of the swing arm to be hinged. 
         [0021]    The bracket plate may include an arc-shaped bent end longitudinally formed on an end of a rear portion thereof to receive and hinge the stabilizer; and a space defined between an end of the arc-shaped bent end and a spring hook protruding downwards from the base plate to render the torsion spring to be hinged. 
         [0022]    As is apparent from the above description, the hinge apparatus for the mobile terminal according to the present invention is advantageous in that the ends of the rotary portions of the display housing and the main housing come into close contact with each other by the orbital motion of the slider during the folding operation, so that the display region of the folder as well as the display region attached to the main housing is maximized, thus leading to the maximized convenience of use. 
         [0023]    Further, the hinge apparatus for the mobile terminal is advantageous in that the above-described folding structure is achieved, so that it is unnecessary to separately form a protrusion and a space which are required to mount the hinge apparatus to the overlapping rotary ends of the main housing and the display housing, thus realizing the miniaturization and the slimness of the device due to the omitted protrusion and space. 
         [0024]    Furthermore, the hinge apparatus for the mobile terminal is intended to solve the incomplete folding of the display housing through a tension band which pulls the slider with a predetermined tension so that the slider is smoothly retreated when the display housing is folded, thus allowing the folding operation of the mobile terminal to be more conveniently and more easily performed and thereby enhancing usability and achieving technical advance, therefore achieving a high investment value in the same field. As a result, this invention is very useful. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0025]      FIG. 1  is a perspective view showing a conventional hinge structure for a mobile terminal; 
           [0026]      FIG. 2  is an exploded perspective view showing the coupling of a hinge apparatus for a mobile terminal according to the present invention; 
           [0027]      FIG. 3  is an enlarged sectional view showing an internal structure of the hinge apparatus for the mobile terminal according to the present invention; 
           [0028]      FIG. 4  is an exploded perspective view showing an assembly structure of a slider in the hinge apparatus for the mobile terminal according to the present invention; 
           [0029]      FIGS. 5A to 5D  are enlarged sectional views showing an operation of the hinge apparatus for the mobile terminal according to the present invention, when it is unfolded; 
           [0030]      FIGS. 6A to 6C  are enlarged sectional views showing an operation of a tension band when the hinge apparatus for the mobile terminal according to the present invention is folded; 
           [0031]      FIG. 7  is a perspective view showing the structure of a free-stop hinge in the hinge apparatus for the mobile terminal according to the present invention; and 
           [0032]      FIG. 8  is a perspective view showing a state in which a display housing is unfolded by the hinge apparatus for the mobile terminal according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0033]    Hereinbelow, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that the present invention will be easily carried out by those skilled in the art. 
         [0034]      FIG. 2  is an exploded perspective view showing the coupling of a hinge apparatus for a mobile terminal according to the present invention.  FIG. 3  is an enlarged sectional view showing an internal structure of the hinge apparatus for the mobile terminal according to the present invention.  FIG. 4  is an exploded perspective view showing an assembly structure of a slider in the hinge apparatus for the mobile terminal according to the present invention.  FIGS. 5A to 5D  are enlarged sectional views showing an operation of the hinge apparatus for the mobile terminal according to the present invention, when it is unfolded.  FIGS. 6A to 6C  are enlarged sectional views showing an operation of a tension band when the hinge apparatus for the mobile terminal according to the present invention is folded.  FIG. 7  is a perspective view showing the structure of a free-stop hinge in the hinge apparatus for the mobile terminal according to the present invention.  FIG. 8  is a perspective view showing a state in which a display housing is unfolded by the hinge apparatus for the mobile terminal according to the present invention. 
         [0035]    As shown in  FIGS. 2 and 3 , the hinge apparatus A for the mobile terminal according to the present invention includes a slider  1 , a barrel  2 , a cycle attachment  3 , and a bonding assembly  4 . The slider  1  is accommodated in a side of a main housing  910  of the mobile terminal to repeatedly perform a movement along a curved orbit in conjunction with the folding of a display housing  920 . The barrel  2  is integrally attached to the display housing  920  and is hinged to an end of the slider  1  to enable the folding of the display housing  920 . The cycle attachment  3  is further provided in the main housing  910  to assist the movement of the slider  1  and the rotation of the barrel  2  induced by the movement thereof. The bonding assembly  4  is assembled with the slider  1 , the barrel  2  and the cycle attachment  3  to guide the movement of the slider  1 . 
         [0036]    Preferably, an opening groove  910   a  is formed by cutting a central portion of an edge of the main housing  910  to receive the barrel  2  and to prevent the movement of the slider  1  and the rotation of the display housing  920  from interfering with each other. 
         [0037]    The slider  1  repeats the movement along the curved orbit from the interior of the main housing  910  to the exterior of the device in such a way as to fold the display housing  920  in a reciprocating manner. A barrel receiving groove  1   a  is inwardly formed on a central portion of an edge of a front portion of the slider  1  to receive the barrel  2 . As the barrel receiving groove  1   a  is formed, first and second holding ends  11  and  12  protrude from opposite sides of the barrel receiving groove  1   a  to come into close contact with both ends of the barrel  2 . 
         [0038]    In order to assemble the slider with the cycle attachment  3  and the bonding assembly  4 , guide pins  13  protrude from both ends of a rear portion of the slider to be inserted into guideway brackets  43  of the bonding assembly  4 , which will be described later herein. 
         [0039]    Further, a first recess hole  1   b  is formed in a central portion of an upper end of the front portion of the slider  1  to receive a follow projection  411  which projects downwards from a lower surface of a base plate  41  of the bonding assembly  4 , which will be described later herein, when the display housing  920  is unfolded. 
         [0040]    In addition, a plurality of spring-axle locating grooves  1   c  is formed on an edge of the rear portion of the slider  1  at predetermined intervals so that torsion springs of the cycle attachment  3  are received and located therein. Both a lower joint  35  of the spring and a spring axle  36  pass through the spring-axle locating grooves  1   c.    
         [0041]    Moreover, arm holes  1   d  are inwardly formed in both ends of the slider  1  such that an end of a swing arm  32  of the cycle attachment  3  which will be described later is inserted into each of the arm holes. 
         [0042]    Further, a first hinge groove  11   a  and a shaft hole  12   a  are inwardly formed in inner walls of the first and second holding ends  11  and  12  such that a free-stop hinge  22  and a rotating shaft  21  of the barrel  2  which will be described later are inserted therein. 
         [0043]    Further, band receiving portions  11   b  and  12   b  for receiving and protecting the tension band  23  of the barrel  2  which will be described later are formed in front ends of openings of the left and right shaft holes  11   a  and  12   a . Each receiving portion is partially cut off to expose the tension band  23  to the outside. 
         [0044]    As shown in  FIG. 4 , the slider  1  is configured such that the second holding end  12  is detachably assembled therewith, thus allowing the barrel  2  received in the barrel receiving groove  1   a  to be more easily assembled therewith. 
         [0045]    The barrel  2  includes the rotating shaft  21  that rotates the display housing  920  folded from a side of the main housing  910 , serves as a hinge point of the display housing  920 , and protrudes from an end in a longitudinal direction of the barrel, and the free-stop hinge  22  that is provided on an opposite end to prevent the idle movement of the barrel  2  immediately after the display housing  920  is folded or unfolded. 
         [0046]    Further, the tension band  23  is wound on an outer surface of the rotating shaft  21 , and provides tension to allow the slider  1  to be smoothly received in the main housing  920  while the display housing  920  is folded. 
         [0047]    Moreover, a second hinge groove  2   a  is inwardly formed in an end on which the free-stop hinge  22  is provided, thus enabling the insertion of the free-stop hinge  22 . A hinge spring  222  of the free-stop hinge  22  and a rotation preventing stopper  224  of an A cam are received in the second hinge groove. A pulley  221  is mounted between the rotation preventing stopper  224  of the A cam of the free-stop hinge  22  and an A cam and S cam combination  223  such that the tension band  23  is wound thereon. 
         [0048]    A second recess hole  2   b  is downwardly formed in the central portion of the upper end of the barrel  2  to receive the follow projection  411  that protrudes downwards from the lower surface of the base plate  41  of the bonding assembly  4 , which will be described below, when the display housing  920  is folded. 
         [0049]    Preferably, one end of the tension band  23  wound around the pulley is provided with a ring for securing the band, while the other end is provided with a hanger  231  that is bound to the bonding assembly  4  to generate the tension on the band  23 . 
         [0050]    The cycle attachment  3  renders the arc-shaped movement of the slider  1  and the rotation of the barrel  2  to be performed naturally. 
         [0051]    The cycle attachment includes a guideway bracket  43 , a stabilizer  31 , left and right swing arms  32 , a plurality of torsion springs  33 , and upper and lower joints  34  and  35 . The guide pin  13  protruding from a rear of the slider is fitted into the guideway bracket, so that it controls the rear orbit of the slider  1 . A central portion of the stabilizer is hinged to the bonding assembly  4  and both ends thereof which are rotatable around the hinged central portion in a radial direction are assembled with the guide pin  13  via links  311 , thus allowing the left and right moving distances of the slider  1  to be kept equal when the slider  1  performs the movement. Each swing arm  32  rotates in a radial direction while being hinged at one end thereof to the bonding assembly  4  and inserted at the other end into the arm hole  1   d  of the slider  1 , thus controlling a front orbit when the slider  1  performs the movement. An upper end of each torsion spring is positioned between the bracket plate  42  and the spring hook  423 , a central portion thereof is fitted over the spring shaft  331 , and both ends are coupled to the spring axles  36 , thus achieving the semi-automatic movement of the slider  1  when the display housing  920  is folded, and having an elastic repulsive force to secure the slider at a fully ejected position and a fully retraced position. The upper and lower joints  34  and  35  serve to maintain a uniform distance among three action points (a rotating shaft of a base plate side, a center of a spring coil, and a center of a spring axle) of the spring. 
         [0052]    The stabilizer  31  is bent to form steps at both ends thereof, so that the both ends are rotatable about a central portion thereof in the radial direction. Preferably, the links  311  are provided on the both ends of the stabilizer, with a pin hole  311   a  formed through each link to insert the guide pin  13  of the slider  1  therein. 
         [0053]    The torsion spring  33  generates a repulsive force by torsion moment, thus realizing the semi-automatic movement of the slider  1 . Preferably, in order to prevent a coil portion from being deformed by the generated torsion moment, the spring shaft  331  and the spring axles  36  are further provided to continuously pass through the plurality of torsion springs  33 , the upper joint  34 , and the lower joint  35 . 
         [0054]    The bonding assembly  4  is assembled with the slider  1  and the cycle attachment  3  to guide the movement of the slider  1 . The bonding assembly includes a base plate  41 , a bracket plate  42 , and left and right guideway brackets  43 . The base plate is secured to an inner wall of an upper portion of the main housing  910 . The bracket plate is further assembled with a central portion of a lower surface of the base plate  41  in such a way as to be in close contact therewith, thus causing the stabilizer  31  and the torsion spring  33  to be hinged to each other. The guideway brackets are fastened to both edges of the lower surface of the base plate  41 , thus placing the slider  1  under the base plate  41  and guiding the movement of the slider  1  as the display housing  920  is folded. 
         [0055]    The follow projection  411  and a spring hook  423  are provided on the base plate  41 . The follow projection projects downwards from a lower surface of an end of a front portion of the base plate to create a rotating angle of the display housing  920 . The spring hook is bent downwards, so that an upper rotating shaft of the spring is positioned therein. 
         [0056]    A band support hole  42   a  is formed through an edge of the bracket plate  42  to support and bind the hander  231  of the tension band  23 . An arc-shaped bent end  421  is longitudinally formed in an end of a rear portion of the bracket plate to seat and hinge a central portion of the stabilizer  31  of the cycle attachment  3 . A joint recess  422  is formed in the arc-shaped bent end  421  to be at a position corresponding to the upper joint  34 , thus allowing a rotating shaft of the spring  33  on a base-plate side to be freely rotated. 
         [0057]    Guideway grooves  43   a  and  43   b  are longitudinally formed through the guideway bracket  43  to have a curved orbit along which the inserted guide pin  13  slides forwards and backwards, thus guiding the movement of the slider  1  in conjunction with the folding of the display housing  920 . Further, an arm bearing  412  is formed in an upper portion of a front of the guideway bracket to support a rotating shaft of the swing arm  32  on a base side. 
         [0058]    Reference letter “s” denotes at least one stopper for absorbing shocks when an end of a rotary portion of the display housing comes into close contact with an end of a rotary portion of the main housing. 
         [0059]    An operation of the hinge apparatus A for the mobile terminal according to the present invention configured as described above will be described below in detail. 
         [0060]    First, as shown in  FIG. 3 , the barrel  2  integrally attached to a surface of the display housing  920  is received in the barrel receiving groove  1   a  of the slider  1 , and simultaneously assumes a state wherein it is rotatable about the first and second holding ends  11  and  12  using the rotating shaft  21  and the free-stop hinge  22 . 
         [0061]    Here, the tension band  23  wound on the rotating shaft  21  is received in the band receiving portion  12   b  and is simultaneously drawn out at an end equipped with the hanger  231 , so that the end is bound to the band support hole  42   a  of the bracket plate  42 . The tension band  23  wound on the free-stop hinge is received in the band receiving portion  11   a , and the hanger  231  is likewise bound to the band support hole  42   a  of the bracket plate  42 . 
         [0062]    Thus, the display housing  920  is coupled to a side of the main housing  910  in such a way as to be foldable. The free-stop hinge  22  prevents an undesirable movement when the display housing  920  is finally folded or unfolded by the rotation of the barrel  2 . 
         [0063]    Further, when the display housing  920  is folded, the tension of the tension band  23  allows the slider  1  to be smoothly moved backwards and received in the main housing  910 . This is realized by the tension of the tension band  23 . 
         [0064]    Subsequently, the slider  1  is received in the main housing  910  by the bonding assembly  4 , and is reciprocated along the curved orbit in conjunction with the driving of the cycle attachment  3 , thus being repeatedly moved out from or retracted into the main housing  910 . 
         [0065]    To this end, the base plate  41  of the bonding assembly  4  is assembled with the main housing  910  in such a way as to be in close contact with the upper portion of the inner wall thereof, and the bracket plate  42  is further attached to the central portion of the lower surface of the base plate  41 , thus allowing the stabilizer  31  of the cycle attachment  3 , the left and right swing arms  32  and the torsion spring  33  to be hinged to the bonding assembly  4 . 
         [0066]    Thereafter, the guideway brackets  43  are coupled to lower surfaces of both sides of the base plate  41 . Preferably, the base plate  41  and the guideway bracket  43  are assembled with each other via additional screw bolts (not shown). 
         [0067]    Through such a process, the bonding assembly  4  is fixed and it is possible to provide a mobile terminal which is configured such that its display housing  920  is foldable by the movement of the slider  1  along the curved orbit and the rotation of the barrel  2 . 
         [0068]    As described above, the operation of unfolding the display housing  920  using the hinge apparatus A of the present invention will be described. 
         [0069]    First, as shown in  FIG. 5A , as the follow projection  411  is received in the second recess hole  2   b  and the barrel cam  24  is not moved by the free-stop hinge  22 , the display housing  920  maintains a close contact state with a side of the main housing  920 . 
         [0070]    In this state, if the display housing  920  is rotated, as shown in  FIGS. 5B ,  5 C and  5 D, the display housing  920  is unfolded, so that the unfolded state is obtained. Thus, this may be achieved by the rotation of the barrel cam  24  and the movement of the slider  1  along the curved orbit. 
         [0071]    In this case, the movement of the slider  1  is uniformly assisted by the cycle attachment  3  and the bonding assembly  4 . 
         [0072]    That is, if the slider  1  is moved out by the folding of the display housing  920 , the rear portion of the slider  1  moves along the guideway grooves  43   a  and  43   b  of the guideway brackets  43  of the cycle attachment  3 , while the front portion thereof moves along an arc path as the swing arms  32  rotate in a radial direction. The display housing  920  is rotated by the barrel cam  24 . 
         [0073]    While the slider  1  is moved out, the barrel cam  24  moves the slider  1  beyond a neutral position of the torsion spring  33  and thereafter moves the display housing  920  to a final unfolded position by the combination of the repulsive force of the torsion spring  33  mounted between the rear of the slider  1  and the bracket plate  42  and the force of the free-stop hinge  22 . 
         [0074]    Meanwhile, when the display housing  920  is fully folded, the follow projection  411  received in the second recess hole  2   b  pushes the barrel cam  24 , thus generating a force for ejecting the slider  1  out. As soon as the guide pins  13  come into close contact with the ends of the guideway grooves  43   a  and  43   b , the operation of unfolding the display housing  920  is completed. 
         [0075]    As such, as the display housing  920  is unfolded by the slider  1 , an end of the rotary portion of the display housing  920  is in contact with an end of a side of the main housing  910 , thus forming an extending surface. Therefore, a display portion of a folder and a display provided on a back of a main body do not overlap each other but are placed in the same direction, thus maximizing the convenience of use. 
         [0076]    On the other hand, the operation of folding the display housing  920  may be performed in the reverse order of the operation of unfolding the display housing  920 . Particularly, the slider  1  can be smoothly received in the main housing  910 , so that the incomplete folding of the display housing  920  is relieved by the tension band  23 . 
         [0077]    In other words, if the folder  920  rotates in the folding direction (closed direction, counterclockwise direction of the drawing), the barrel rotates counterclockwise and the tension band wound on the rotating shaft of the barrel is taken up. Since the other end of the tension band is attached to the interior of the base plate, tension pulling the slider  1  into the main housing  910  is generated and thus the slider  1  is continuously drawn in. In this case, the torque of the free-stop hinge also plays role in moving the slider inwards. 
         [0078]    Therefore, the hinge apparatus A according to the present invention allows the display housing  920  to perform an excellent folding operation. Further, as shown in  FIG. 8 , the end of the rotary portion of the display housing  920  does not overlap the end of a side of the main housing  910 , so that the display portion of the folder and the main body are placed on the roughly same plane, thus maximizing the area for the display portion, realizing the miniaturization and slimness of the device, and providing an unique design to the mobile terminal because of a differentiated hinge structure 
         [0079]    In addition, it is possible to replace the display of the main body with a general keypad according to the specification of a product. 
         [0080]    Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 
         [0000]    
       
         
               
             
               
               
             
           
               
                   
               
               
                 &lt;Description of reference numerals of important parts&gt; 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 A: hinge apparatus 
                 1: slider 
               
               
                 1a: barrel receiving groove 
                 1b: first recess hole 
               
               
                 1c: spring locating groove 
                 1c-1: spring hole 
               
               
                 1d: arm hole 
                 11: first holding end 
               
               
                 11a: first hinge groove 
                 12: second holding end 
               
               
                 12a: shaft hole 
               
               
                 12b: band receiving portion 
                 13: guide pin 
               
               
                 2: barrel 
                 2a: second hinge groove 
               
               
                 2b: second recess hole 
                 3: cycle attachment 
               
               
                 4: bonding assembly 
                 21: rotating shaft 
               
               
                 22: free-stop hinge 
                 221: hinge shaft pulley 
               
               
                 222: hinge spring 
               
               
                 223: hinge S cam/A cam combination 
               
               
                 224: hinge A cam stopper 
                 23: tension band 
               
               
                 231: hanger 
                 24: barrel cam 
               
               
                 31: stabilizer 
                 311: link 
               
               
                 311a: pin hole 
                 32: swing arm 
               
               
                 33: torsion spring 
                 331: spring shaft 
               
               
                 34: upper joint 
                 35: lower joint 
               
               
                 36: spring axle 
                 41: base plate 
               
               
                 411: follow projection 
                 412: arm bearing 
               
               
                 42: bracket plate 
                 42a: band support hole 
               
               
                 43: guideway bracket 
                 43a, 43b: guideway groove 
               
               
                 421: arc-shaped bent end 
                 422: joint recess 
               
               
                 423: spring hook 
                 910: main body 
               
               
                 911: main-body display 
                 920: folder