Abstract:
A rotary device includes a first member and a second member magnetically and rotatablely connected with the first member by a magnetic force. The magnetic force is capable of automatically adjusting the first member to a target position when the first member is rotated away from an initial position and exceeding a predetermined range relative to the second member.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to rotary devices, and particularly, to a rotary device with a rotary mechanism. 
         [0003]    2. Description of Related Art 
         [0004]    Rotary devices, such as bar phones, are ubiquitous. Commonly, a bar phone includes a first member for mounting a display unit thereon, a second member having a keyboard and a camera thereon, and a hinge rotatablely connecting the first member to the second member. The keyboard and the camera are disposed on opposite sides of the second member. 
         [0005]    The display unit of the first member and the keyboard of the second member are in the same side. When the user uses the bar phone to take a picture of himself, the second member is rotated thereby having the camera and the display unit facing the user. However, it is inconvenient to rotate the first member and accurately stopping at 180 degrees so as to have the display unit and the camera on the same side. 
         [0006]    Therefore, an improved rotary device is needed to address the aforementioned deficiencies and inadequacies. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1  is an isometric view of a rotary device in accordance with an exemplary embodiment. 
           [0008]      FIG. 2  is an exploded view of the rotary device of  FIG. 1  from one perspective. 
           [0009]      FIG. 3  is an exploded view of the rotary device of  FIG. 1  from another perspective. 
           [0010]      FIG. 4  is an isometric view of the rotary device in  FIG. 1  of a rotated state. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0011]    Referring to  FIGS. 1 to 3 , a rotary device  100  such as a bar phone includes a first member  200 , a second member  300 , and a rotary mechanism  400 . The rotary mechanism  400  rotatably connects the first member  200  to the second member  300 . The first member  200  and the second member  300  communicate with each other via a signal cable  600 . 
         [0012]    The first member  200  is approximately a rectangular cuboid and defines a first receiving space  210  adjacent to the second member  300 . Two screw holes  214  are defined in the bottom of the first receiving space  210 . A first mounting hole  212  is also defined in the bottom of the first receiving space  210  and between the two screw holes  214 . 
         [0013]    The second member  300  is similar to the first member  200 . The second member  300  is approximately a rectangular cuboid and defines a second receiving space  310  corresponding to the first receiving space  210 . Two screw holes  314  are defined in the bottom of the second receiving space  310 . A second mounting hole  312  is also defined in the bottom of the second receiving space  310  and between the two screw holes  314 . 
         [0014]    The rotary mechanism  400  includes a shaft  450 , and a first magnetic body  440 , a washer  430 , and a second magnetic body  420 . The shaft  450  is a hollow cylinder with opposite ends inserted into the first mounting hole  212  and the second mounting hole  312 , thus the first member  200  and the second member  300  are rotatable around the shaft  450 . The first magnetic body  440 , the washer  430 , and the second magnetic body  420  are sleeved on the shaft  450 . The washer  430  is sandwiched between the magnetic bodies  440 ,  420 . 
         [0015]    The first magnetic body  440  is engageably received in the first receiving space  210 . Two fixing holes  442  are defined in the first magnetic body  440  corresponding to the two screw holes  214  of the first member  200 . Two screws  500  threadedly engage with the two screw holes  214  after passing through the two fixing holes  442 , correspondingly, to fasten the first magnetic body  440  to the first member  200 . As a result, the first magnetic body  440  can rotate together with the first member  200 . A through hole  444  is defined in the magnetic body  440  corresponding to the first mounting hole  212  of the first member  200  for allowing the shaft  450  to pass through the first magnetic body  440 . 
         [0016]    The second magnetic body  420  is engageably received in the second receiving space  310 . Two fixing holes  422  are defined in the second magnetic body  420  corresponding to the two screw holes  314  of the second member  300 . Two screws  500  threadedly engage with the two screw holes  314  after passing through the two fixing holes  422  correspondingly to fasten the second magnetic body  420  to the second member  300 . A through hole  424  is defined in the second magnetic body  420  corresponding to the second mounting hole  312  of the second member  300  for allowing the shaft  450  to pass through the second magnetic body  420 . The side of the first magnetic body  440  and the side of the second magnetic body  420  facing each other have different magnetic poles, such that a magnetic attraction force exists between the first magnetic body  440  and the second magnetic body  420 . 
         [0017]    The washer  430  defines a through hole  432  configured for allowing the shaft  450  to pass through. The washer  430  defines a gap  434  for allowing replacement. 
         [0018]    In use, an external force is applied to rotate the first member  200  with the first magnetic body  440  clockwise or counter-clockwise relative to the second member  300  associating with the second magnetic body  420 . The magnetic attraction force, generated between the first magnetic body  440  and the second magnetic body  420 , may be equilibrated by a friction force generated between the first magnetic body  440  and the second magnetic body  420 , thus the first member  200  can be precisely located between an initial position and a target position when the external force is released. It should be noted that the initial position and the target position are determined by the shape of the first magnetic body  420  and the second magnetic body  440 . In this embodiment, the first magnetic body  420  and the second magnetic body  420  are strip/bar shaped. 
         [0019]    As shown in  FIG. 4 , the first member  200  rotates with respect to the second member  300 . In a first condition, when the first member  200  is rotated relative to the second member  300  within a predetermined range, say between 0 and 90 degrees or 270 to 360 degrees, the magnetic attraction force generated between the first magnetic body  440  and the second magnetic body  420  drives the first member  200  to return to the initial position. In the initial position, a maximum magnetic attraction force is generated between the first magnetic body  440  and the second magnetic body  420 , and the first member  200  aligns with the second member  300  at a first angle A 1 , in this embodiment, this first angle is 0 degrees. In this case, the rotary device  100  can be considered as being in a normal position. 
         [0020]    In a second condition, when the first member  200  is rotated relative to the second member  300  not within the predetermined range, that is more than 90 degrees and less than 270 degrees, the magnetic attraction force generated between the first magnetic body  440  and the second magnetic member  440  drives the first member  200  to rotate and rest at the target position. In the target position, a maximum magnetic attraction force is also generated between the first magnetic body  440  and the second magnetic body  420 , and the first member  200  aligns with the second member  300  at a second angle A 2 , in this embodiment, this second angle is 180 degrees. In this case, the rotary device  100  may be used to take a self-portrait, and a preview and/or a photo of the self-portrait taken by a camera (not labeled) attached to the second member  300  may be displayed on the display screen of the first member  200 . An input device and the camera may be arranged on opposite sides of the second member  300  correspondingly. 
         [0021]    In addition, the first magnetic body  440  and the second magnetic body  420  are still functional after repetitious use. Therefore, a reliability of the rotary device  100  is improved. 
         [0022]    Moreover, the washer  430  sandwiched between the first magnetic body  440  and the second magnetic body  420  can decrease friction between the first magnetic body  440  and the second magnetic body  420  when the first member  200  rotates with respect to the second member  300 . Therefore, the reliability and work life of the rotary device  100  is further improved. 
         [0023]    It is to be understood, however, that even though numerous information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; and that changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.