Patent Publication Number: US-2009236480-A1

Title: Rotary device

Description:
BACKGROUND 
     1. Technical Field 
     Embodiments of the present disclosure generally relate to rotary devices, and particularly to a rotary device having a rotary mechanism. 
     2. Description of Related Art 
     Commonly, a rotary device includes a first member, a second member, and a hinge connecting the first member to the second member. The hinge is often composed of resilient members and cams. The first member is thus rotatable with respect to the second member. However, restoring forces of the resilient members may be weakened after repeatedly rotating the first member with respect to the second member, thus the reliability of the rotary device decreases with use. 
     Therefore, improved rotary devices are needed to address the aforementioned deficiencies and inadequacies. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an isometric view of a rotary device in accordance with an exemplary embodiment. 
         FIG. 2  is a partially exploded view of the rotary device in  FIG. 1 . 
         FIG. 3  is an exploded view of the rotary device in  FIG. 1  from one direction. 
         FIG. 4  is an exploded view of the rotary device in  FIG. 1  from a reverse direction to  FIG. 3 . 
         FIG. 5  is an isometric view of the rotary device in  FIG. 1  in a rotated state. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Referring to  FIG. 1 , a rotary device  99 , for example, a display device, includes a first member  200 , a second member  300 , and a rotary mechanism  400 . The rotary mechanism  400  rotatablely connects the first member  200  to the second member  300 , thus the first member  200  is rotatable with respect to the second member  300 . 
     Referring to  FIGS. 2 to 4 , the first member  200  includes a main body  210 , two first protruding posts  230  perpendicularly connected with the main body  210 . A first mounting hole  250  is defined in the main body  210  and between the two first protruding posts  230 . 
     The second member  300  is similar with the first member  200 . The second member  300  includes a base portion  310 , two second protruding posts  330  substantially perpendicular to the base portion  310 . A second mounting hole  350  is defined in the base portion  310  and between the two second protruding posts  330 . 
     The rotary mechanism  400  includes a shaft  450 , a first magnetic body  440 , a washer  430 , and a second magnetic body  420 . The shaft  450  is cylindrical and the two ends of the shaft  450  are configured to be rotatably inserted into the first mounting hole  250  and the second mounting hole  350  correspondingly, thus the first member  200  is rotatable with respect to the second member  300 . 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 . 
     The first magnetic body  440  is disk-shaped and attached to the first member  200 . The first magnetic body  440  defines two fixing holes  442  configured for engageably receiving the first protruding posts  230 , correspondingly, as a result the first magnetic body  440  can be fastened to the first member  200 , and rotating the first member  200  drives the first magnetic body  440  to rotate. A through hole  444  is defined in the first magnetic body  440  and between the two fixing holes  442  for allowing the shaft  450  to pass through the first magnetic body  440 . 
     The second magnetic body  420  is disk-shaped and attached to the second member  300 . The second magnetic body  420  defines two fixing holes  422  configured for engageably receiving the two second protruding posts  330  correspondingly, as a result the second magnetic body  420  can be fastened to the second member  300 . A through hole  424  is defined in the second magnetic body  420  and between the two fixing holes  422  for allowing the shaft  450  to pass through the second magnetic body  420 . Corresponding surfaces of the first magnetic body  440  and the second magnetic body  420  have different polarities. 
     The washer  430  defines a through hole  432  configured for allowing the shaft  450  to pass through. 
     In use, an external rotating force is applied to the first member  200 , as a result the first member  200  will drive the first magnetic body  440  to rotate clockwise or counter-clockwise to any angle (referring to  FIG. 5 ) with respect to the second magnetic body  420 . Corresponding surfaces of the first magnetic body  440  and the second magnetic body  420  having different polarities can generate an attractive magnetic force between the first magnetic body  440  and the second magnetic body  420 , thus the first magnetic body  440  and the first member  200  are stably stopped when the external force is released. In addition, the first magnetic body  440  and the second magnetic body  420  are still functional after repetitious use. Therefore, the reliability of the rotary device  99  is improved. 
     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  99  are further improved. 
     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.