Patent Publication Number: US-8991225-B2

Title: Burglarproof device for electronic device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a burglarproof device. Particularly, the present invention relates to a burglarproof device for electronic device. 
     2. Description of the Prior Art 
     Consumer electronic products play a very important role in the modern life. Fast lifestyle and eagerness for instant information make portable electronic devices become a necessity to most people. However, since these portable devices are in high demand, wide spread, high unit price, small volume, and high portability and become more and more popular, the possibility of being stolen or lost accordingly increases. 
     One type of locks, which is developed to against thieves, is connected to the electronic product, wherein the lock is specifically connected to the electronic product via the fastener thereof into a lock hole on the electronic product. The electronic product connected to the lock is secured and locked by the fastener through a locking operation. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a burglarproof device for electronic device, the burglar device having a fastener that is easy to operate and better in securing. 
     The burglarproof device for electronic device of the present invention includes a fastener, a control unit, and a lock core. The fastener includes a plurality of lever arms surrounding a virtual axis. The control unit moves relative to the fastener and drives ends of the lever arms to move toward each other when the control unit approaches the fastener. The ends of the lever arms move away from each other when the control unit leaves the fastener. The unlocked lock core permits the movement of the control unit relative to the fastener while the locked lock core restricts the control unit from moving relative to the fastener. For example, the locking operation of the lock core drives the control unit to move toward the fastener, and the unlocking operation of the lock core drives the control unit to move away from the fastener. 
     The burglarproof device for electronic device of the present invention includes a fastener, a control unit, and a lock core. The fastener includes a plurality of lever arms surrounding a virtual axis. The control unit moves relative to the fastener and has a guiding surface, wherein the guiding surface guides ends of the lever arms to move along the guiding surface and toward each other when the control unit approaches the fastener; the ends of the lever arms move away from each other when the control unit leaves the fastener. A locking operation for the lock core drives the control unit to approach the fastener while an unlocking operation for the lock core drives the control unit to leave the fastener. 
     The burglarproof device for electronic device of the present invention includes a fastener, a control unit, an operating device, and a lock core. The fastener includes a plurality of lever arms surrounding a virtual axis. The control unit moves relative to the fastener and has a guiding surface, wherein the guiding surface guides ends of the lever arms to move along the guiding surface and toward each other when the control unit approaches the fastener; the ends of the lever arms move away from each other when the control unit leaves the fastener. The operating device drives the control unit to move relative to the fastener. The unlocking operation of the lock core releases the operating device while the locking operation of the lock core restricts the operating device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a three-dimensional view of the first embodiment of the burglarproof device of the present invention; 
         FIG. 2  shows an exploded view of the first embodiment of the burglarproof device of the present invention; 
         FIG. 3A  is a side view of a combination of the fastener, the sleeve, and a portion of the control unit of the first embodiment of the burglarproof device of the present invention in the connecting-permissible status (the original status); 
         FIG. 3B  is a front view of the combination shown in  FIG. 3A ; 
         FIG. 3C  is a cross-sectional view along the cross-sectional line AA in  FIG. 3B ; 
         FIG. 4  is a side view of the first embodiment of the burglarproof device of the present invention in the connecting-permissible status (the original status) with the housing being removed; 
         FIG. 5A  is a side view of a combination of the fastener, the sleeve, and a portion of the control unit of the first embodiment of the burglarproof device of the present invention in the locked status; 
         FIG. 5B  is a front view of the combination shown in  FIG. 5A ; 
         FIG. 5C  is a cross-sectional view along the cross-sectional line BB in  FIG. 5B ; 
         FIG. 6  is a side view of the first embodiment of the burglarproof device of the present invention in the locked status with the housing being removed; 
         FIG. 7A  and  FIG. 7B  are schematic views of the appearance of the second embodiment of the burglarproof device of the present invention in the original and the connecting-permissible status, respectively; 
         FIG. 8  is an exploded view of the second embodiment of the burglarproof device of the present invention; 
         FIG. 9A  and  FIG. 9B  are respectively a three-dimensional view and a side view of the second embodiment of the burglarproof device of the present invention in the original status with the housing being removed; 
         FIG. 10A  and  FIG. 10B  are respectively a three-dimensional view and a side view of the second embodiment of the burglarproof device of the present invention in the connecting-permissible status with the housing being removed; 
         FIG. 11  shows a three-dimensional view of the third embodiment of the burglarproof device of the present invention; 
         FIG. 12  is an exploded view of the third embodiment of the burglarproof device of the present invention; 
         FIG. 13A  is a three-dimensional view of the third embodiment of the burglarproof device of the present invention in the connecting-permissible status (the original status) with a portion of the housing being removed; 
         FIG. 13B  is a top view of  FIG. 13A ; 
         FIG. 13C  is a cross-sectional view along the cross-sectional line CC in  FIG. 13B ; 
         FIG. 14A  is a three-dimensional view of the third embodiment of the burglarproof device of the present invention in the locked status with a portion of the housing being removed; 
         FIG. 14B  is a top view of  FIG. 14A ; 
         FIG. 14C  is a cross-sectional view of along the cross-sectional line DD in  FIG. 14B ; and 
         FIG. 15  is a schematic view of the burglarproof device of the present invention in use. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, embodiments of the burglarproof device of the present invention are illustrated in detail with reference to the drawings. 
     The orientation recited in the specification such as upper, lower, left, and right corresponds to the orientation shown in the figures. When the orientation of the burglarproof device is changed, the relations among the members are not changed. 
     As  FIG. 15  shows, the burglarproof device  10  of the present invention may be used in coordination with a flexible member  700  such as cable and chain to tie an electronic device  900  to furniture, a portable and storageable object, or a vehicle, etc. to be prevented from stealing. The electronic device  900  shown in the figure is a notebook computer but is not limited thereto; the electronic device mentioned in the specification may be such as a tablet computer, a digital camera, and the like. The electronic device may have a hole having a shape of rectangular, circle, ellipse, or any geometry formed on a housing  910  thereof. 
     As  FIG. 1  and  FIG. 2  show, the burglarproof device  10   a  of the present invention has a fastener  100 , a control unit  200 , a lock core  400 , and a housing  600 . The fastener  100  is controlled to be in a connecting-permissible status or a locked status (i.e. controlling the burglarproof device  10   a  to be in the connecting-permissible status or the locked status; wherein the connecting-permissible status is generally a status in which the fastener  100  may be connected to, inserted into, or attached to the above-mentioned hole of the electronic device, and vice versa, i.e. the fastener  100  may also be disconnected from, pulled out of, or detached from the above-mentioned hole of the electronic device) by means of relative movements of the fastener  100  and the control unit  200 , especially the control unit  200  moving toward or away from the fastener  100 . An unlocking or a locking operation of the lock core  400  may be operated along with the movement of the control unit  200 . Alternatively, an unlocked status of the lock core  400  permits the movement of the control unit  200 , and a locked status of the lock core  400  restricts the movement of the control unit  200 . In the first embodiment of the present invention shown in  FIG. 1  and  FIG. 2 , the lock core  400  is a key lock. 
     On the other hand, the housing  600  primarily includes a first housing  610   a , a second housing  620   a , and a sleeve  630 . The sleeve  630  has a tubular shape and is able to enclose a portion of the fastener  100 , wherein a portion of the fastener  100  is exposed for entering or leaving a hole  911  formed on a housing  910  of the electronic device. The first housing  610   a  encloses a portion of the fastener  100 , the control unit  200 , and the lock core  400 . The second housing  620   a  may be provided, for example, for the flexible member  700  such as a cable or a chain to be disposed thereon. 
     The fastener  100  of the burglarproof device  10   a  includes a plurality of lever arms  140  received in the sleeve  630 . As shown in  FIG. 2  and  FIG. 3A , the sleeve  630  has the tubular shape but is not limited thereto. The sleeve  630  may have other shapes as long as a plurality of lever arms can be moveably received therein without being interfered by the sleeve  630 . In order to demonstrate the movement of the plurality of lever arms  140 , a cross-sectional view of the sleeve  630  is shown in  FIG. 3C , wherein it is noted that the sleeve  630  substantially encloses/surrounds the plurality of lever arms  140 . 
     Each of the lever arms  140  has a pivot  141 , an effort arm  142  beside the pivot  141 , and a resistance arm  143  beside the pivot  141  and opposite to the effort arm  142 . The effort arm  142 , the pivot  141 , and the resistance arm  143  can constitute a flat V shape so that the a free end of the effort arm  142  and a front end  144  of the resistance arm  143  have a longer displacement, wherein the pivot  141  is at the bottom of the V shape, the effort arm  142  and the resistance  143  preferably tilt from the pivot  141  and toward the same direction. 
     The number of the lever arms  140  is not limited. For example, the number of the lever arms  140  could be two, three, four, five, etc. (two lever arms  140  are shown in the figure). However, it is preferred that the lever arms  140  evenly surround a virtual axis L. Meanwhile, the pivots  141  of the lever arms  140  are close to each other and surround the virtual axis L. The effort arms  142  and the resistance arms  143  are at the same orientation, respectively. Furthermore, a side of the lever arm  140  facing the virtual axis L is defined as an inner side  146  while the reverse side thereof is defined as an outer side  145 . The outer side  145  of the front end  144  of the resistance arm  143  has a projection  147  formed thereon. An end of the projection  148  forms a hook portion  149 . The plurality of lever arms  140  in the status mentioned above, i.e. surrounding the virtual axis L, are received in the tubular sleeve  630 . The plurality of effort arms  142  extends out of the sleeve  630  from an orifice at one end (the rear end) of the sleeve  630  while the plurality of resistance arms  143  extends out of the sleeve  630  from another orifice at the other end (the front end) of the sleeve  630 , wherein a distance between the projection  147  and the orifice of the other end (the front end) of the sleeve  630  is at least equal to a thickness of the housing  910  of the electronic device  900  around the hole  911 . In addition, the virtual axis L and the axis of the sleeve  630  are preferably coaxial. 
     An elastic member  500  is disposed among the plurality of effort arms  142  and applies force to the effort arms  142  evenly so that the free ends of the effort arms  142  are distant from each other. In the case shown in the figure that the number of the lever arms  140  is two, the elastic member  500  may be a torsional spring made of steel wire. In other cases that the number of the lever arms  140  is three or greater, the elastic member  500  may be a bead made of elastic material such as rubber and is clamped by the effort arms  142 . 
     The control unit  200  is next to the rear end of the fastener  100  and includes a connecting portion  230  and a guiding surface  250 . The connecting portion  230  is for connecting the control unit  200  and the above-mentioned lock core/key lock  400 . By operating the key lock  400 , the control unit  200  may move relative to the fastener  100  along the virtual axis L to approach or leave the fastener  100 . The guiding surface  250  is located on a side of the control unit  200  that faces the fastener  100  and is a conical surface or an oblique plane sloping towards the virtual axis L and away from the fastener  100 . In addition, the guiding surface  250  may be a flat surface or a curved surface such as an arc surface. 
     Further speaking, the control unit  200  includes a connecting portion  230  and a controlling portion  240 . As  FIG. 2  shows, the connecting portion  230  is a shaft, which has a recess  231  formed thereon for receiving such as a moveable pin (not shown). The lock core/key lock  400  is operated in cooperation with the shaft  230  and the members disposed thereon such as the moveable pin to achieve the unlocked or the locked status. 
     The controlling portion  240  operates the fastener  100  to be in the connecting-permissible status or the locked status. The controlling portion  240  may include a structure of wedge block as shown in the figure; the above-mentioned guiding surface  250  is the oblique plane of the wedge block  241 . For example, the controlling portion  240  of the embodiment further includes a disc  242 . At least two wedge blocks  241  are disposed on an edge of the disc  242  in a way of the oblique planes of the wedge blocks  241  facing each other, and corresponding to the effort arms  142  of the above-mentioned two lever arms  140 , respectively. In addition, an interval between the two wedge blocks  241  is preferably greater than a sum of length of the free ends of the two effort arms  142  along a direction perpendicular to the virtual axis L. 
     When the burglarproof device  10   a  is in the connecting-permissible status, as shown in  FIGS. 3A-3C  and  FIG. 4 , the elastic member  500  enables the free ends of the effort arms  142  of the plurality of lever arms  140  to be away from each other, i.e. the front ends  144  of the resistance arms  143  approach each other. Meanwhile, the projections  147  located at the front ends  144  of the plurality of resistance arms  143  gather at the virtual axis L so that a shape and a diameter of the gathering projections  147  in a radial direction with respect to the virtual axis L allow the projections  147  to get across the hole  911  of the housing  910  of the electronic device. Under such condition, the fastener  100  is able to enter or leave the hole  911  of the housing  910  of the electronic device by the resistance arms  143  having the projections  147  on the front ends  144 . In the embodiment, the connecting-permissible status is also an original status of the burglarproof device  10   a.    
     When the fastener  100  of the burglarproof device  10   a  having its resistance arms  143  entering the hole  911  of the housing  910  of the electronic device, it is ready to proceed with a locking operation. Please refer to  FIG. 4  and then  FIG. 6 , operating the key lock  400  will drive the control unit  200  through the connecting portion  230 , which results in the control unit  200  moving relative to the fastener  100  to approach the fastener  100 . Meanwhile, the guiding surface  250  of the control unit  200  contacts the free ends of the effort arms  142 . Since the control unit  200  is continued to be driven by the above-mentioned key lock  400  to move relative to the fastener  100  along the virtual axis L and approach the fastener  100 , the guiding surface  250  pushes against the free ends of the plurality of effort arms  142  so that the effort arms  142  move along the guiding surfaces  250  and simultaneously approach to each other. In other words, two effort arms  142  gradually gather together between the two wedge blocks  241 , as shown in  FIGS. 5A-5C  and  6 . Since the free ends of the effort arms  142  approach to each other, the elastic member  500  disposed among the plurality of effort arms  142  are therefore compressed by the effort arms  142  and deformed with a restoring force for returning to an initial status. 
     On the other hand, since the free ends of the effort arms  142  of the plurality of lever arms  140  move along the guiding surfaces  250  and simultaneously approach to each other, the front ends  144  of the resistance arms  143  move away from each other, wherein the plurality of projections  147  previously gathering at the virtual axis L spread radially. When the fastener  100 , especially the resistance arm  143  of the lever arm  140  has been inserted into the hole  911 , the ends of the projections  148  spread to a degree of not able to be pulled out of the hole  911  of the housing  910  of the electronic device, and the housing  910  of the electronic device interferes with the hook portion  149 . In other words, the burglarproof device  10   a  is in the locked status and unable to be disengaged from the hole  911  of the housing  910 . 
     In order to release the burglarproof device  10   a  from the locked status to the connecting-permissible and unlocked status, the above-mentioned lock core  400  of key lock is operated to drive the connecting portion  230  of the control unit  200 , which makes the control unit  200  to move along the virtual axis L and away from the fastener  100 . For example, using a key to operate a rotation of a bead seat of the lock core  400  enables the moveable pin to move along the recess  231  on the shaft  230  and contract, in other words, making the shaft  230  disengage from a secured status and move. Meanwhile, the wedge block  241  and the guiding surface  250  also move away from the free ends of the effort arms  142 . When the guiding surface  250  does not interfere with the free ends of the effort arms  142 , the confinement of the free ends of the effort arms  142  are released and the elastic member  500  returns to the initial status due to the restoring force and pushes the effort arms  142  to be restored to its original status of being far away from each other. On the other hand, the projections  147  located at the front ends  144  of the plurality of resistance arms  143  come closer to the virtual axis L again to reach a state that is able to be in and out of the hole  911  of the housing  910  of the electronic device. At this time, the burglarproof device  10   a  is allowed to be detached from the hole  911  of the housing  910  of the electronic device so that the electronic device is released. 
     Alternatively, the lock core  400  of key lock need not drive directly the connecting portion  230  as long as the forced exerted on the fastener  100  by the connecting portion  230  is released, e.g. by releasing the restoring force of the elastic member. Since the elasticity of the elastic member  500  pushes the effort arms  142 , the free ends of the effort arms  142  are restored to the original status of being far away from each other. Meanwhile, the free end of the effort arm  142  pushes the guiding surface  250  so that the connecting portion  230  moves away from the fastener  100 . The unlocking operation is therefore easily accomplished. 
     In view of the above description, it is comprehended that the distance between the projection  147  and the orifice of the front end of the sleeve  630  is at least equal to the thickness of the housing  910  of the electronic device  900  around the hole  911 . Since the thickness of the housing  910  of electronic devices varies, a pad  800  of may be disposed in front of the housing  600  if there is a gap formed between a front end of the housing  600  and the electronic device and needed to be filled. The pad  800  may be formed of elastic material such as rubber or PVA, which may deform in accordance with the gap between the front end of the housing  600  and the electronic device to substantially fill the gap. 
     In another embodiment of the present invention, as shown in  FIGS. 7A-7B  and  FIG. 8 , the burglarproof device  10   b  has the fastener  100 , the control unit  200 , a lock core of combination lock  400 , the housing  600 , and an operating device  300 , wherein the housing  600  includes a first housing  610   b  and a second housing  620   b . The first housing  610   b  and the second housing  620   b  face each other, move toward the virtual axis L to combine and form an accommodation space for receiving the control unit  200 , the lock core  400 , and a portion of the fastener  100 . At least one of the first housing  610   b  and the second housing  620   b  has a hole  605  and a first through hole  606 . The hole  605  is for dial(s)  410  of the lock core  400  of the combination lock to be exposed while the first through hole  606  is for the operating device  300  to be exposed for an user&#39;s operating. On the other hand, the combination of the first housing  610   b  and the second housing  620   b  also form a second through hole  607  communicating with the accommodation space. The second through hole  607  may be for the resistance arm  143  of the lever arm  140  of the fastener  100  to extend out and get across the hole  911  of the housing  910  of the electronic device. The second through hole  607  is equal to the orifice of the front end of the sleeve  630  in the previous embodiment. 
     As mentioned above, the fastener  100  of the embodiment includes a plurality of lever arms  140  received in a front portion of the housing  600  close to the second through hole  607 . The elastic member  500  is disposed among the effort arms  142  of the plurality of the lever arms  140 . 
     The control unit  200  is disposed next to the rear end of the fastener  100  and includes the connecting portion  230  and the guiding surface  250 . The connecting portion  230  is connected with the lock core  400  of combination lock. By means of an unlocking operation or a locking operation, the lock core  400  of combination lock allows or restricts movements of the control unit  200  relative to the fastener  100  and along the virtual axis L. The guiding surface  250  is located on a side of the control unit  200  that faces the fastener  100  and may be a conical surface or an oblique plane sloping towards the virtual axis L and away from the fastener  100 . In addition, the guiding surface  250  may be a flat surface or a curved surface such as an arc surface. 
     Further speaking, the control unit  200  includes the connecting portion  230 , the controlling portion  240 , and the driven portion  260 . As shown in  FIG. 8 , the connecting portion  230  is a shaft, which has a plurality of teeth  232  formed on a surface thereof for cooperating with the lock core  400  to perform the unlock or lock operation. In addition, when the lock core  400  is unlocking, the shaft may move along an axis C; the axis C may be on the virtual axis L; alternatively, the axis C may be shifted away from the virtual axis L and parallel to the virtual axis L. In the embodiment, it is preferred that the axis C and the virtual axis L are substantially parallel to each other. 
     The controlling portion  240  controls the fastener  100  to be in the connecting-permissible status or the locked status. The controlling portion  240  may include a tubular structure. A cylindrical tube  243  has one end facing the fastener  100 , wherein an inner side thereof is formed as an inner wall of a funnel, wherein the inner wall is drawn close in a direction away from the fastener  100  and serves as the guiding surface  250 . The inner wall of the funnel  250  also corresponds to the effort arms  142  of the lever arms  140 , as described above. In addition, the cylindrical tube  243  has an inner wall connected to a narrower end of the funnel  250  (i.e. the end where the inner wall drawn close), where the cylindrical tube  243  has an inner diameter preferably greater than the sum of length of the free ends of the two effort arms  142  along a direction perpendicular to the virtual axis L. 
     The driven portion  260  may interact with the operating device  300  of the embodiment. The operating device  300  may have a structure such as button, knob, switch, or rotary disc exposed from the first through hole  606  for the user touching and operating. Additionally, the operating device  300  may have a driving portion  310  entering the accommodation space formed by the housing  600  and interacting with the control unit  200  or the lock core  400 . In the embodiment, the operating device  300  has the driving portion  310  formed as a wedge block for interacting with the control unit  200  through the driven portion  260 . 
     The driven portion  260  is a slot formed in the control unit  200 . The slot  260  corresponds to the driving portion  310  and is able to receive at least a portion of the driving portion  310 . An oblique plane  311  of the driving portion/wedge block  310  may contact with a slot wall  261  of the slot  260 . In the embodiment, a displacement of the driving portion/wedge block  310  perpendicular to the virtual axis L and toward the slot  260  makes the control unit  200  move along the virtual axis L and away from the fastener  100  (the shaft  230  moves along the axis C) by means of the oblique plane  311  pushing against the slot wall  261 . Alternatively, when the control unit  200  is unable to move along the virtual axis L, the oblique plane  311  of the wedge block  310  contacts against the slot wall  261  of the slot  260  so that the wedge block  310  cannot move toward the slot  260 , i.e. the button  320  is unpressable. 
     Since the lock core of combination lock  400  in the unlocked state allows the control unit  200  to move along the virtual axis L (wherein the shaft  230  moves along the axis C) while the lock core of combination lock  400  in the locked state restricts control unit  200  from moving, the driving portion/wedge block  310  is moveable toward the slot  260  only when the lock core of combination lock  400  is unlocked, wherein the control unit  200  is pushed to move along the virtual axis L and away from the fastener  100 , i.e. the user can press the button  320 . When the lock core of combination lock  400  is locked, the lock core  400  and the control unit  200 , especially the driving portion  260  restricts the displacement of the driving portion/wedge block  310 , i.e. the user cannot press the button  320 . 
     When the burglarproof device  10   b  is in an original status, as shown in  FIG. 7A  and  FIGS. 9A-9B , the tubular controlling portion  240  of the control unit  200  contacts against the free ends of the effort arms  142  through the inner wall of the funnel  250  or an inner wall. In other words, the cylindrical tube  243  gathers two effort arms  142  so that the resistance arms  143  move away from each other. At the same time, the elastic member  500  disposed among the effort arms  142  is compressed by the effort arms  142  and deformed with a restoring force for returning to an initial status. 
     On the other hand, the front ends  144  of the resistance arms  143  are away from each other. The plurality of projections  147  spread radially from the virtual axis L, wherein the ends of the projections  148  spread to a degree of not able to pass through the hole  911  of the housing  910  of the electronic device. 
     When the burglarproof device  10   b  is in the original status, one end of the driving portion/wedge block  310  is located near an entrance of the slot  260 . When the lock core of combination lock  400  of the burglarproof device  10   b  in the original status is unlocked, the driving portion/wedge block  310  may move toward the slot  260  to push the control unit  200  to move along the virtual axis L and away from the fastener  100 . As shown in  FIG. 7B  and  FIGS. 10A-10B , the cylindrical tube  243  moves away from the effort arms  142  along with the control unit  200  moving away from the fastener  100 . Meanwhile, the cylindrical tube  243  no longer confines the two effort arms  142  coming closer to each other, i.e. the confinement of the free ends of the effort arms  142  by the inner wall of the cylindrical tube  243  is released. At the same time, the elastic member  500  is released to the initial status and pushes the free ends of the effort arms  142  to be restored to a state of being away from each other due to the restoring force. On the other hand, the projections  147  located at the front ends  144  of the plurality of resistance arms  143  gather at the virtual axis L, which allow themselves to get across the hole  911  of the housing  910  of the electronic device. At the same time, the burglarproof device  10   b  is in the connecting-permissible status and is allowed to be detached from the hole  911  of the housing  910  of the electronic device. Alternatively, the burglarproof device  10   b  is allowed to be connected to the electronic device. 
     On the contrary, when the oblique plane  311  of the driving portion/wedge block  310  no longer pushes against the slow wall  261 , e.g. the pressing of the button is released, it is preferred that the control unit  200  moves along the virtual axis L and toward the fastener  100 , e.g. the control unit  200  is pushed by the restoring force of the elastic member  500 . At the same time, the cylindrical tube  243  also moves toward the effort arms  142 . The cylindrical tube  243  starts in contacting the free ends of the effort arms  142  from the inner wall of the funnel  250 , the free ends of the effort arms  142  then move toward each other and along the inner wall of the funnel  250 . The two effort arms  142  are preferably gathered in the cylindrical tube  243 . At the same time, the front ends  144  of the resistance arms  143  move away from each other, wherein the plurality of projections  147  previously gathering at the virtual axis L spread radially. In the case that the fastener  100 , i.e. the resistance arm  143  of the lever arm  140  has been inserted into the hole  911 , when the ends of the projections  148  spread to the degree of not able to pass through the hole  911  of the housing  910  of the electronic device, the housing  910  of the electronic device interferes with the hook portion  149 . That is, the burglarproof device  10   b  is unable to be pulled out of the hole  911  of the housing  910 . Meanwhile, it is able to further perform the locking operation of the lock core of combination lock  400  to make the burglarproof lock  10   b  be in the locked status. 
     In the another embodiment of the invention, as shown in  FIGS. 11-12 , the burglarproof device  10   c  has the fastener  100 , the control unit  200 , the lock core of key lock  400 , and the housing  600 , wherein the lock core  400  may move along the axis C during the unlocking and locking operation. 
     As mentioned above, the fastener  100  of the embodiment includes the plurality of lever arms  140  (two lever arms are shown in the figure), which preferably evenly surround the virtual axis L. In the embodiment, the virtual axis L and the axis C may be perpendicular to each other. The elastic member  500  is disposed between the effort arms  142  of the two lever arms  140 . 
     In the embodiment, the control unit  200  is aside the effort arms  142  of the two lever arms  140  of the fastener  100  and includes the connecting portion  230  and the controlling portion  240 , wherein “being aside” means an orientation of 90 degrees with respect to the above-mentioned outer side with reference to the virtual axis L. The connecting portion  230  is for connecting the above-mentioned lock core/key lock  400 . By operating the key lock  400 , the control unit  200  may move relative to the two effort arms  142  of the fastener  100  along or parallel to the axis C to approach or leave the fastener  100 . 
     The controlling portion  240  operates the fastener  100  to be in the connecting-permissible status or the locked status and may include the structure of wedge block as shown in the figure. For example, the controlling portion  240  of the embodiment further includes a plate  245  extending from the lock core of key lock  400 , at least two wedge blocks  244  are disposed on opposite sides of the plate  245  in a way of the oblique planes of the wedge blocks  244  facing each other and correspond to the effort arms  142  of the two lever arms  140 , respectively; wherein the oblique plane of the wedge block  244  serve as the guiding surface  250 . In addition, an interval between the two wedge blocks  244  is preferably greater than the sum of length of the free ends of the two effort arms  142  along the direction perpendicular to the virtual axis L. 
     In other words, the two wedge blocks  244  and the plate  245  constitute a U-shaped structure. The two effort arms  142  may be eventually gathered in the U-shaped structure  246  along with a displacement of the control unit  200  along or parallel to the axis C toward the two effort arms  142 . 
     When the burglarproof device  10   c  is in the connecting-permissible status, as shown in  FIGS. 13A-13C , the elastic member  500  makes the free ends of the effort arms  142  of the plurality of lever arms  140  move away from each other, i.e. the front ends  144  of the resistance arms  143  approach to each other. Meanwhile, the projections  147  located at the front ends  144  of the plurality of resistance arms  143  gather at the virtual axis L so that the shape and the diameter of the gathering projections  147  in a radial direction with respect to the virtual axis L allow themselves to get across the hole  911  of the housing  910  of the electronic device. On the other hand, the control unit  200  is away from the two effort arms  142 . 
     When performing the locked operation of the lock core of key lock  400 , the lock core  400  may drive the connecting portion  230  so that the control unit  200  moves relative to the two effort arms  142  of the fastener  100  and approach the two effort arms  142 . The control unit  200  will contact the free ends of the effort arms  142  from the guiding surfaces  250  of the controlling portion  240 . By means of the continuous driving of the above-mentioned key lock  400  along/parallel to the axis C, the control unit  200  moves relative to the fastener  100  and approaches the fastener  100 , the guiding surfaces  250  push against the free ends of the two effort arms  142  so that the effort arms  142  move along the guiding surfaces  250  and simultaneously approach to each other; in other words, two effort arms  142  are gradually gathered together between the two wedge blocks  244 . 
     As  FIGS. 14A-14C  show, two effort arms  142  are eventually gathered in the U-shaped structure  246 , i.e. between the two wedge blocks  244 . On the other hand, the plurality of projections  147  previously gathering at the virtual axis L spread radially therefrom. When the fastener  100 , especially the resistance arm  143  of the lever arm  140 , has been inserted into the hole  911 , the ends of the projections  148  spread to a degree of not able to pass through the hole  911  of the housing  910  of the electronic device, the burglarproof device  10   c  cannot be pulled out of the hole  911  of the housing  910  and the burglarproof device  10   c  is in the locked status. 
     Although the preferred embodiments of present invention have been described herein, the above description is merely illustrative. The preferred embodiments disclosed will not limit the scope of the present invention. Further modification of the invention herein disclosed will occur to those skilled in the respective arts and all such modifications are deemed to be within the scope of the invention as defined by the appended claims.