Abstract:
A stylus includes a stylus barrel, a electrically conductive stylus head connecting to the stylus barrel, a rod assembly and a shaft. The rod assembly includes a swing block and an elastic member connecting the end of the swing block. The rod assembly is assembled in stylus barrel, the shaft is secured on the stylus barrel and passes through the swing block, making the swing block enable to tilt about the shaft, an end of the stylus head rotatably connects the other end of the swing block relative to the elastic member, the other end of the stylus head exposed to the stylus barrel, the elastic member provides an elastic force to cause the stylus head return to the original position after the stylus is moved into a tilted position.

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to styluses, and particularly, to a stylus used in portable electronic devices. 
     2. Description of the Related Art 
     With the development of wireless communication and information processing technologies, portable electronic devices, such as mobile phones and personal digital assistants (PDAs), employing touch screens are now in widespread use. The styluses are commonly used for writing against the touch screen of the electronic device. Especially, condenser-type styluses are employed widespread, the condenser-type stylus needs to electronically conduct with body of user for forming an electronic field in the electronic device when using the stylus, making the electronic device enable to detect the writing signal of the stylus. However, the conventional condenser-type styluses associated with such devices are complicated in structure and therefore costly to manufacture. 
     Therefore, there is room for improvement within the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present stylus can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present stylus. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded isometric view of an embodiment of a stylus. 
         FIG. 2  is an isometric view of the stylus shown in  FIG. 1  in assembling. 
         FIG. 3  is an integral, assembled isometric view of the stylus shown in  FIG. 1 . 
         FIG. 4  is a cut-away view of the stylus shown in  FIG. 3  along the direction IV-IV. 
         FIG. 5  is a cut-away view of the stylus shown in  FIG. 3 , when the stylus is in use. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows an exemplary embodiment of a stylus  100  used in a portable electronic device such as a mobile phone, or a personal digital assistant (PDA). The stylus  100  includes a stylus barrel  10 , a rod assembly  20 , a sleeve  30 , a stylus head  40 , a shaft  50  and several connecting pins. The rod assembly  20  and the stylus head  40  are assembled in the sleeve  30 , and the sleeve  30  is assembled in the stylus barrel  10 . The stylus head  40  is mechanically connected forming an electrically conductive connection with the stylus barrel  10  and an end of the stylus head  40  extends out of the stylus barrel  10 , to make sure the stylus head  40  electrically conducting with the body of user when using. 
     The stylus barrel  10  has an open end and an opposite closed end, and further includes a barrel wall  12 , a receiving chamber  14  and a stop flange  16  (shown in  FIG. 4 ). The stop flange  16  is annularly formed in the internal surface of the barrel wall  12 , abutting the closed end. The barrel wall  12  radially defines a shaft hole  122 , adjacent to the open end, passing through the opposite two sides of the barrel wall  12 . The shaft hole  122  can receive the shaft  50  therein. 
     The rod assembly  20  includes a first connecting member  21 , an elastic member  22 , a second connecting member  23 , and a swing block  24 . The first connecting member  21  includes a first main plate  212 , a first connecting plate  214  perpendicularly extending from one end surface of the first main plate  212 , and a first connecting post  216  perpendicularly extending from the other end surface of the first main plate  212 . The first main plate  212  forms two opposite latching flanges  2122  on the periphery thereof. The first connecting plate  214  has a first connecting hole  2142  defined therein. The first connecting post  216  is configured to engage with an end of the elastic member  22 . 
     The elastic member  22  may be a coil-spring and can be displaced between the first connecting member  21  and the second connecting member  23  to provide an elastic force for the first connecting member  21  and the second connecting member  23 . 
     The second connecting member  23  includes a second main plate  232 , two parallel clamping plates  234  perpendicularly extending from an end surface of the second main plate  232 , and a second connecting post  236  perpendicularly extending from an opposite end surface of the second main plate  232 . The second main plate  232  has two opposite pillars  2322  protruding from the periphery. The two clamping plates  234  enclose a space (not labeled) for clamping an end of the swing block  24 , and the two clamping plates  234  define two coaxially aligned second connecting holes  2342 . The second connecting post  236  is positioned towards the first connecting post  216  and can engage the other end of elastic member  22 . 
     The swing block  24  defines a middle hole  242  and two end holes  244 . The middle hole  242  is defined at the center of the swing block  24 , and is generally rectangular and facilitates the shaft  50  to pass through. The middle hole  242  can be a guiding hole and the shaft  50  can slide along the sidewall of the middle hole  242 . Each end holes  244 , adjacent to an end of the swing block  24 , enables the swing block  24  to connect with the second connecting member  23  and the stylus head  40 . 
     The sleeve  30 , may be tube shaped with two ends of which can slidably surround the rod assembly  20  and stylus head  40  including a peripheral wall  32 , a first opening end  34  at one end and a second opening end  36  at the opposite end. The peripheral wall  32  defines two latching grooves  322 , abutting on the first opening end  34 , oppositely located at two sides of the peripheral wall  32 . Each latching groove  322  axially extends toward to the second opening end  36 , the latching groove  322  is in a stepped shape and includes a first latching section  3222  and a second latching section  3224 . The first latching section  3222  interconnects the first opening end  34  and is wider than the second latching section  3224 . The first latching section  3222  has substantially the same width as the latching flange  2122 , and can receive the latching flange  2122  sliding along the first latching section  3222 . The second latching section  3224  has substantially the same width as the diameter of the pillar  2322 , and can receive the pillar  2322  sliding along the second latching section  3224 . The peripheral wall  32  defines a cutout  324  at the opposite other end, interconnecting the second opening end  36  and for providing a space where the stylus head  40  rotates. The peripheral wall  32  radially defines a first fixing hole  326  and a second fixing hole  328 . The first fixing hole  326  is positioned adjacent to the first opening end  34  and connects to the first connecting member  21 . The second fixing hole  328  is positioned adjacent to the second opening end  36  and is used to connect the stylus head  40  to the sleeve  30 . 
     The stylus head  40  includes a bar portion  42  and a tip portion  44  formed at an end of the bar portion  42 . The bar portion  42  can be inserted into the inside of the sleeve  30  from the second opening end  36  and rotatably connects with the sleeve  30 . The bar portion  42  axially defines a slot  422  for receiving the other end of the swing block  24 . The bar portion  42  radially defines a first engaging hole  424  and a second engaging hole  426 . The first engaging hole  424  is adjacent to the outer end of the bar portion  42  and allows the shaft  50  to pass through. The second engaging hole  426 , positioned adjacent to the middle of the bar portion  42 , is used for connecting the swing block  24  with the stylus head  40 . The bar portion  42  can define a depression  428  at the sidewall for a rotation of the stylus head  40 . The tip portion  44  is generally a disk-shaped and connects with the bar portion  42  at an obtuse angle, and the tip portion  44  is for manipulation of a touch screen of an electronic device. 
     Referring to  FIG. 2 , to assemble the stylus  100 , the rod assembly  20  is assembled. During this process, one end of the swing block  24  connects to the second connecting member  23 . The end of the swing block  24  extends into the space between the two clamping plates  234 . The end hole  244  aligns with the two second connecting holes  2342 . The first connecting pin  25  passes through the second connecting holes  2342  and the end hole  244  to rotatably connect the swing block  24  with the second connecting member  23 . Then, the two ends of the elastic member  22  respectively engage with the first connecting post  216  and the second connecting post  236 , so the rod assembly  20  is assembled substantially. 
     Referring to  FIGS. 3 and 4 , the rod assembly  20  is positioned into the sleeve  30  for assembly. The swing block  24  extends into the sleeve  30  from the first opening end  34 , the second main plate  232  is received in the sleeve  30  and the pillars  2322  slide along the second latching sections  3224  until the pillars  2322  resist against the bottom of the second latching section  3224 . The first main plate  212  is received in the sleeve  30  and the latching flanges  2122  slide along the first latching sections  3222  until the latching flanges  2122  abuts against the bottom of the first latching sections  3222 . At the same time, the first connecting hole  2142  aligns with the first fixing hole  326 . A second connecting pin  60  passes through the first fixing hole  326  and the first connecting hole  2142  to securely connect the first connecting member  21  to the sleeve  30 . The elastic member  22  is compressed between the first connecting member  21  and the second connecting member  23 . An end of the swing block  24  extends to abut to the second opening end  36 . 
     Then, the bar portion  42  of the stylus head  40  is inserted into the sleeve  30  from the second opening end  36 , and the slot  422  of the bar portion  42  receives one end of the swing block  24 . The second engaging hole  426  aligns with the end hole  244  of the swing block  24 . A third connecting pin  70  passes through the second engaging hole  426  and the end hole  244  to rotatably connect the swing block  24  with the stylus head  40 . At the case, the first engaging hole  424  aligns with the middle hole  242  of the swing block  24 . 
     The sleeve  30  is mounted into the receiving chamber  14  of the stylus barrel  10  until the first opening end  34  of the sleeve  30  resists against the stop flange  16 . At this time, the shaft hole  122  of the stylus barrel  10 , the middle hole  242 , the second fixing hole  328  and the first engaging hole  424  aligns with each other in the written order. The shaft  50  is assembled, by passing through the shaft hole  122  of the stylus barrel  10 , the middle hole  242 , the second fixing hole  328  and then the first engaging hole  424 . Then, the sleeve  30  is secured in the stylus barrel  10 , while the stylus head  40  can rotate about the shaft  50 , and the tip portion  44  of the stylus head  40  is exposed relative to the stylus barrel  10 . Accordingly, the stylus  100  is assembled. 
     Referring to  FIG. 5 , in use of the stylus  100 , the stylus head  40  flexes as it is pressed by an external force against the writing surface of the electronic device to maintain a more constant pressure against the writing surface of the electronic device. The bar portion  42  tilts at a pivot point relative to the shaft  50  until the bottom of the depression  428  resists against the end wall of stylus barrel  10 . The swing block  24  tilts at a pivot point relative to the second connecting pin  60  at a corresponding angle. At the same time, the swing block  24  axially moves toward to the second connecting member  23 , with the shaft  50  sliding from one end to the other end of the middle hole  242 . Thus, the swing block  24  resists against the second connecting member  23 , the pillars  2322  slide along the second latching sections  3224  to form a gap  2324 . The elastic member  22  is completely compressed. After the stylus head  40  is released, the elastic member  22  resists against the second connecting member  23 , the swing block  24  rotates and the bar portion  42  rotates correspondingly, and the stylus head  40  returns to the original state. 
     To make the stylus head  40  conductive, the stylus barrel  10 , the sleeve  30  and the stylus head  40  should be made of electrically conductive materials. 
     It is to be understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of assemblies and functions of various embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.