Abstract:
A portable electronic device includes a body, a casing, and a resilient element. The casing accommodates the body such that the body can slide within the casing. The casing has an opening through which an electrical connection unit connected to the body protracts out of, or retracts into, the casing. The resilient element has an end connected to the casing and another end abutting against the body. The resilient element exerts a resilient restoring force upon the body in response to the sliding of the body. The casing has a stop structure configured to operate in conjunction with an engagement structure of the body and thereby limit the range of the sliding of the body. The engagement structure can be disengaged from the stop structure to separate the body from the casing. Accordingly, the portable electronic device has multiple uses, namely quick maintenance, easy assembly, body protection, and automatic accommodation.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 099134711 filed in Taiwan, R.O.C. on Oct. 12, 2010, the entire contents of which are hereby incorporated by reference. 
     FIELD OF THE TECHNOLOGY 
     The present invention relates to portable electronic devices, and more particularly, to a portable electronic device capable of receiving therein an electrical connection unit automatically. 
     BACKGROUND 
     With memory devices becoming more popular with people and memory capacity becoming larger, portable plug-and-play (PnP) electronic products are in wide use. Conventional portable electronic devices each comprise a casing and a body enclosed therein. The body of the conventional electronic device comprises a storage unit and an electrical connection unit protruding out of the casing. The storage unit can be connected to an external electrical connection end via the electrical connection unit so as to enable data transmission. The external electrical connection end is exemplified by a USB flash drive or a USB stick. 
     As mentioned earlier, the electrical connection unit is exposed from the casing. The casing consists of an upper cover and a lower cover. Due to the two aforesaid features, conventional portable electronic devices are vulnerable. The electrical connection unit is likely to be hit and damaged, because it is exposed from the casing. The upper and lower covers can be crushed as a result of a hit on the casing. To overcome the aforesaid drawbacks of conventional portable storage devices, protection for the electrical connection units of recently developed portable storage devices is improved. For example, the electrical connection unit of a portable storage device is covered with a protective cover whenever the portable storage device is idle. Alternatively, the electrical connection unit is retractable into the casing. Normally, the retraction of the retractable electrical connection unit is performed manually by means of a manually operated rod. Nonetheless, it is not uncommon for the portable electronic device to become inoperable after the manually operated rod has severed under an inappropriate force. 
     Taiwan Patent No. M360428, entitled Connector Retractable Device for USB Flash Drive, discloses two bilaterally disposed spring structures for use with a USB flash drive such that a push exerted on the rear end of the body of the USB flash drive by the user is followed by automatic retraction and resultant positioning of the body of the USB flash drive under the reaction of the springs abutting against the body of the USB flash drive. However, the spring structures of Taiwan Patent No. M360428 have the following drawbacks: failure to demonstrate ease of use, user-based operation-dependent retraction function, and the likelihood of damaging the body, or crushing the upper and lower covers, of the USB flash drive as a result of a hit thereon. Similar drawbacks are found in Taiwan Patent No. M376871 entitled Flash Drive Having Retractable Connector. 
     Accordingly, it is imperative to provide a portable electronic device advantageously characterized by enhanced protection for its body and a electrical connection unit, a reinforced casing structure for protecting the received electrical connection unit and body, automatic accommodation of the electrical connection unit in the casing without requiring a user to touch a driving rod, and a structure conducive to easy separation of the body and the casing so as to facilitate maintenance. 
     SUMMARY 
     It is an objective of the present invention to provide a portable electronic device capable of receiving an electrical connection unit therein automatically without user-based operation as soon as the electrical connection unit is disconnected from an external circuit. 
     It is another objective of the present invention to provide a portable electronic device that allows the electrical connection unit to be safely received inside the portable electronic device whenever the portable electronic device is not in use and enables easy and quick removal of the electrical connection unit while maintenance is underway. 
     In order to achieve the above and other objectives, the present invention provides a portable electronic device comprising: a body comprising a positioning structure, an engagement structure, and an electrical connection unit, the positioning structure having an end provided with a pin, and the electrical connection unit being connectable to an external circuit; a casing for receiving the body slidable within the casing in a direction, the casing having an opening and a stop structure, the opening allowing the electrical connection unit to protract out of the casing or retract into the casing while the body is sliding, the stop structure limiting a sliding range of the body when operating in conjunction with the engagement structure, the casing further having an inner wall disposed thereon with a one-way circular track for receiving the pin, the positioning structure being slidable with the body so as to drive the pin to slide within the one-way circular track, and the one-way circular track being provided with a reverse recess positioned in vicinity of the opening to allow the pin to stay in the reverse recess; and a resilient element having an end coupled to the casing and another end configured to abut against the body, and exerting a resilient restoring force upon the body in response to the sliding of the body. 
     Compared to the prior art, the present invention provides a portable electronic device that allows an electrical connection unit to be automatically received inside the portable electronic device as soon as the body of the electrical connection unit is disconnected from an external circuit. Furthermore, a casing of the portable electronic device is integrally formed as a unitary unit so as to reinforce the portable electronic device. In addition, not only is the electrical connection unit fixed to the inside of the portable electronic device by means of an engagement structure and a stop structure, but maintenance performed on the portable electronic device is speeded up and rendered easy by disengagement of the engagement structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A detailed description of further features and advantages of the present invention is given below so that a person skilled in the art can understand and implement the technical contents of the present invention and readily comprehend the objectives, features, and advantages thereof by reviewing the disclosure of the present specification and the appended claims in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a schematic view of a portable electronic device; 
         FIG. 2  is a cross-sectional schematic view of the portable electronic device shown in  FIG. 1 ; 
         FIG. 3  is a schematic view of the portable electronic device with an electrical connection unit received in a casing; 
         FIG. 4  is a schematic view of the portable electronic device with the electrical connection unit protruding out of the casing; and 
         FIG. 5  is a schematic view of a body of the portable electronic device, showing that the body has a post therein. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1  through  FIG. 5 , there are shown schematic views of a portable electronic device in an embodiment of the present invention. As shown in  FIG. 1 , a portable electronic device  1  comprises a casing  2 , a body  4 , and a resilient element  6 . The casing  2  has an opening  22  and a stop structure  24 . A one-way circular track  26  is disposed on the inner wall of the casing  2 . The one-way circular track  26  is provided with a reverse recess  262  positioned in the vicinity of the opening  22 . The body  4  comprises a positioning structure  42 , an engagement structure  44 , and an electrical connection unit  46 . The positioning structure  42  has one end provided with a pin  422  and the other end provided with a sharply-bent hook  424  fixed to the body  4 . The resilient element  6  has one end coupled to the casing  2  and the other end abutting against the body  4 . The resilient element  6  exerts a resilient restoring force upon the body  4  in response to the sliding of the body  4 . 
     Referring to  FIG. 2 , there is shown a cross-sectional schematic view of the portable electronic device  1  shown in  FIG. 1 . The casing  2  has a receiving space for receiving the body  4 . The body  4  is slidable within the receiving space of the casing  2  in a direction. The electrical connection unit  46  of the body  4  corresponds in position to the opening  22 , thereby allowing the electrical connection unit  46  to protract out of the casing  2  or retract into the casing  2  while the body  4  is sliding, as shown in  FIGS. 3 and 4 . The stop structure  24  limits the sliding range of the body  4  slidable within the casing  2  when operating in conjunction with the engagement structure  44 . The engagement structure  44  restricts the movement of the body  4  to the receiving space of the casing  2  as soon as the body  4  slides into the casing  2 . The body  4  cannot be separated from the casing  2  by sliding, unless the engagement structure  44  is disengaged from the stop structure  24 . For example, to move the body  4  into the casing  2 , a user may press the engagement structure  44  with a tool such that the engagement structure  44  lies lower than the stop structure  24 , and then the user slides the body  4  into the casing  2 ; meanwhile, the engagement structure  44  which has become unrestrained restores to its original position as soon as the body  4  slides into the casing  2 , whereas the stop structure  24  confines the body  4  to the receiving space of the casing  2 . To take the casing-bound body  4  out of the casing  2  for a maintenance-related purpose, the user may press the engagement structure  44  with a tool to remove the restriction otherwise imposed upon the engagement structure  44  by the stop structure  24 , as shown in  FIG. 1 . As mentioned earlier, the body  4  can be easily put into or taken out of the casing  2  by pressing the engagement structure  44 , and thus it is feasible for the casing  2  to be integrally formed as a unitary unit so as to reinforce the portable electronic device  1 . 
     The one-way circular track  26  is disposed on the inner wall of the casing  2 . The one-way circular track  26  further comprises a first track  264  and a second track  266  in communication with each other. Both the first track  264  and the second track  266  are in communication with the reverse recess  262  positioned in the vicinity of the opening  22 . The pin  422  can stay in the reverse recess  262 . The one-way circular track  26  accommodates the pin  422  of the positioning structure  42  as soon as the body  4  slides into the casing  2 . The positioning structure  42  slides together with the body  4 , and in consequence the pin  422  slides within the one-way circular track  26 . For example, the sliding of the body  4  in the direction of the opening  22  causes the pin  422  to slide along the first track  264  and enter the reverse recess  262  and causes the electrical connection unit  46  to protract out of the casing  2 . Conversely, the sliding of the body  4  away from the opening  22  causes the pin  422  to leave the reverse recess  262  and slide along the second track  266  and causes the electrical connection unit  46  to retract into the casing  2 . 
     The one-way circular track  26  further comprises a receiving portion  268  for receiving the positioning structure  42 ; in other words, both the first track  264  and the second track  266  extend from the receiving portion  268 , communicate with each other, and communicate with the reverse recess  262  positioned in the vicinity of the opening  22 . As a result, the pin  422  can move from the receiving portion  268  to the reverse recess  262  by sliding along the first track  264 , and can move from the reverse recess  262  to the receiving portion  268  by sliding along the second track  266 . 
     At the moment that the body  4  slides into the casing  2 , the resilient element  6  abuts against the body  4  and thus exerts a resilient restoring force upon the body  4  in response to the sliding of the body  4  within the casing  2 . For example, the sliding of the body  4  in the direction of the opening  22  causes the pin  422  to follow the first track  264  to the reverse recess  262 , and in consequence the body  4  compresses and deforms the resilient element  6 , as shown  FIG. 4 . Conversely, upon a pause in the sliding of the body  4  and commencement of withdrawal of the pin  422  from the reverse recess  262 , the resilient element  6  exerts a resilient restoring force upon the body  4  to thereby move the body  4  backward, and the pin  422  of the body  4  follows the second track  266  to the receiving portion  268 , as shown in  FIG. 3 . 
     In practice, the user may push the body  4  of the portable electronic device  1 , such that the body  4  slides toward the opening  22  of the casing  2  to thereby allow the electrical connection unit  46  of the body  4  to protract out of the casing  2  through the opening  22 ; meanwhile, the pin  422  of the positioning structure  42  follows the first track  264  of the one-way circular track  26  to the reverse recess  262 . At this point of time, the body  4  slides toward the opening  22  of the casing  2  to thereby compress and deform the resilient element  6 . The compressed resilient element  6  exerts a resilient restoring force upon the body  4 . Once the body  4  slides toward the opening  22  to such an extent that the pin  422  enters the reverse recess  262 , the pin  422  will stay in the reverse recess  262  to assist the electrical connection unit  46  in being fixed to this position, and in consequence the portable electronic device  1  is connected to an external circuit through the electrical connection unit  46 . 
     Afterward, the user may exert a force upon the casing  2  in attempt to withdraw the portable electronic device  1  from the external circuit. In response to the user&#39;s effort, the external circuit exerts an equal reaction upon the electrical connection unit  46  to thereby assist the pin  422  in exiting the reverse recess  262  and entering the second track  26 . Once the user withdraws the portable electronic device  1  completely, the resilient restoring force corresponding to the compression of the resilient element  6  is exerted upon the body  4  such that the body  4  will slide away from the opening  22 ; meanwhile, the pin  422  of the body  4  follows the second track  266  of the one-way circular track  26  to the receiving portion  268 . As mentioned earlier, the body  4  is pushed by a resilient restoring force to thereby slide away from the opening  22 , and, as a result, the electrical connection unit  46  is automatically received in the casing  2 , thereby dispensing the user&#39;s operating the electrical connection unit  46  with a manual rod. 
     In addition, the body  4  further comprises a post  48 . The resilient element  6  is put around the post  48  as soon as the body  4  slides into the casing  2 ; in so doing, the resilient element  6  is fixed between the body  4  and the casing  2  by means of the post  48 , such that the functionality of the resilient element  6  is brought into full play, as shown in  FIG. 5 . 
     The body  4  is a printed circuit board, an electronic component, a memory device, and/or a storage device. The electrical connection unit  46  is a universal serial bus (USB), a serial advanced technology attachment (SATA), an external serial advanced technology attachment (E-SATA), an IEEE 1394 interface (FireWire), or a high-definition multimedia interface (HDMI). 
     Compared to the prior art, the present invention provides a portable electronic device that allows an electrical connection unit to be automatically received inside the portable electronic device as soon as the body of the electrical connection unit is disconnected from an external circuit. Furthermore, a casing of the portable electronic device is integrally formed as a unitary unit so as to reinforce the portable electronic device. In addition, not only is the electrical connection unit fixed to the inside of the portable electronic device by means of an engagement structure and a stop structure, but maintenance performed on the portable electronic device is speeded up and rendered easy by disengagement of the engagement structure. 
     The foregoing embodiments are provided to illustrate and disclose the technical features of the present invention so as to enable persons skilled in the art to understand the disclosure of the present invention and implement the present invention accordingly, and are not intended to be restrictive of the scope of the present invention. Hence, all equivalent modifications and variations made to the foregoing embodiments without departing from the spirit and principles in the disclosure of the present invention should fall within the scope of the present invention as set forth in the appended claims.