Abstract:
A bicycle lock includes a first part and a second part located close to bicycle wheels by two bolts and two respective protection members are connected to the first part and the second part respectively. The protection members cover the heads of the bolts so that the unauthorized person cannot access the bolts to detach the bicycle lock from the bicycle. A lock rod is connected to the first part which is pivotable about the bolt corresponding thereto so as to be inserted into the second part to lock the wheel.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a bicycle lock, and more particularly, to a bicycle lock that is easily cooperated with different types of bicycles and is not unlock from outside without permission. 
     BACKGROUND OF THE INVENTION 
     Bicycles are rapidly accepted by users of different ages and jobs because of high energy cost and environment concerns. Bicycles become a trend of healthy life and bicycles do not consume energy so that the market of bicycles grows fast. How to secure the bicycles when not in use is one of the most concerns when choosing bicycles as an alternative way for transportation. Most of the users will buy a lock to lock their bicycles on a fixed object such as a post or bicycle rails. The conventional bicycle locks do have their inherent drawbacks. 
     There are four types of the conventional bicycle locks, the first one is the U-shaped lock or cable lock. The U-shaped lock and the cable lock can be attached to the bicycle frame when riding and locked to the fixed object by extending a part of the locks through the wheels. However, these locks are not secured on the bicycle frame and easily hit or scrap the coating off. The second one is a fixed lock which is usually located on the seat stays and located above the rear wheel. A latch can be extended through the rear wheel to prevent the rear wheel from rotating. A key is used to unlock the fixed lock. Both of which are easily accessed by the thieves and are easily cut by using tool. The third one is located within the front fork and restricts the rotation of the handlebar to achieve the purpose of security of the bicycle. The fourth one is located within the seat tube and restricts the rotation of the crank. The third and fourth conventional bicycles locks cannot be removed from one bicycle to another, and they usually increase the manufacturing cost for the bicycles. 
     The present invention intends to provide a bicycle lock which has better anti-theft function and can be installed to any type of bicycles. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a bicycle lock which comprises a first part and a second part, wherein the first part is connected to a first cantilever brake boss by a first bolt. A lug extends from an end of the first part. A first protection member is connected to the first part and includes an end piece which covers the first path and a head of the first bolt. Two extensions extend from the first protection member and the lug is located between the two extensions. A lock rod extends through a hole in the lug and two respective through holes in the two extensions. The first protection member and the lock rod are pivotable about the first bolt. The second part is connected to a second cantilever brake boss by a second bolt and includes a passage in which a lock core is received. A second protection member is connected to outside of the second part and includes a top portion which covers the second path and a head of the second bolt. A hook extends from a side of the second protection member and is inserted into the second part. The hook extends into the passage. 
     The bicycle lock further has a reinforcement plate connected across the two cantilever brake bosses the first and second bolts. The positioning plate is connected to the reinforcement plate and the lock rod is removably engaged with the positioning plate. 
     Another embodiment of the bicycle lock is provided and which comprises a first part connected to a first cantilever brake boss by a first bolt and a through hole is defined through the first part and perpendicularly communicates with the first part. A first threaded hole is defined in an underside of the first part and communicates with the first path and the through hole. A first protection member is threadedly connected to the first threaded hole. A lock rod extends through the through hole. A second part is connected to a second cantilever brake boss by a second bolt and includes a passage defined therein. A lock core is received in the passage. A second threaded hole is defined in an underside of the second part and communicates with the second path and the passage. A second protection member is threadedly connected to the second threaded hole. 
     The bicycle lock further has a reinforcement plate connected across the two cantilever brake bosses the first and second bolts. The positioning plate is connected to the reinforcement plate and the lock rod is removably engaged with the positioning plate. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view to show the first embodiment of the bicycle lock of the present invention; 
         FIG. 2  is a perspective view to show the bicycle lock of the present invention; 
         FIG. 3  is a front view of the bicycle lock of the present invention; 
         FIG. 4  shows that the lock rod is pivoted and to be inserted into the second part; 
         FIG. 5  shows that the lock rod is pivoted and inserted into the second part to lock the bicycle; 
         FIG. 6  is a cross sectional view taken along line A-A in  FIG. 5 ; 
         FIG. 7  is an exploded view to show the second embodiment of the bicycle lock of the present invention; 
         FIG. 8  is a perspective view to show the second embodiment of the bicycle lock of the present invention; 
         FIG. 9  is a front view of the second embodiment of the bicycle lock of the present invention; 
         FIG. 10  shows that the lock rod in  FIG. 9  is pivoted and to be inserted into the second part; 
         FIG. 11  shows that the lock rod in  FIG. 10  is pivoted and inserted into the second part to lock the bicycle; 
         FIG. 12  is a cross sectional view taken along line B-B in  FIG. 11 , and 
         FIG. 13  is a cross sectional view taken along line C-C in  FIG. 11 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 3 , the bicycle lock of the present invention comprises a first part  1 , a second part  2 , a reinforcement plate  3  and a lock rod  14 . The first part  1  is connected to a first cantilever brake boss A 1  by extending a first bolt  4  through a first path  11  in the first part  1 , the first cantilever brake boss A 1  can be on the front fork A or the seat stays (not shown). The cantilever brake boss A 1  is connected to a brake arm of the brake system. The bicycle lock can be installed close to the front wheel or the rear wheel (both not shown). A sleeve  111  is located in the first path  11  and a lug  12  extends from an end of the first part  1 . The lug  12  extends in a direction parallel to the direction of the wheel rotates. A hole  121  is defined through the lug  12 . A first protection member  13  is connected to the first part  1  and includes an end piece  131  which covers the first path  11  and a head of the first bolt  4 . Two extensions  132  extend from the first protection member  13  and the lug  12  is located between the two extensions  132 . Two respective through holes  133  are defined through the two extensions  132 . A lock rod  14  extends through the hole  121  in the lug  12  and two respective through holes  133  in the two extensions  132 . The first protection member  13  and the lock rod  14  are pivotable about the first bolt  4 . The lock rod  14  extends perpendicular to the direction that the wheel moves. 
     The second part  2  is connected to a second cantilever brake boss A 1  by extending a second bolt  5  through a second path  21  in the second part  2 . The second cantilever brake boss A 1  can be on the front fork A or the seat stays (not shown). The second part  2  includes a passage  22  defined therein and a lock core  24  received in the passage  22 . An insertion hole  23  is defined in a side of the second part  2  and communicates with the passage  22 . A second protection member  25  is connected to outside of the second part  2  and includes a top portion  251  which covers the second path  21  and a head of the second bolt  5 . A hook  252  extends from a side of the second protection member  25  and inserted into the second part  2  via the insertion hole  23  and a pin  26  extends through the hook  252  to position the hook  252 . The hook  252  extends into the passage  22 . The second protection member  25  further includes an end wall  253  at an end thereof and the end wall  253  faces the first part  1 . 
     A substantially U-shaped reinforcement plate  3  is connected across the two cantilever brake bosses A 1  by the first and second bolts  4 ,  5 , and a positioning plate  31  is connected to the reinforcement plate  3  and the lock rod  14  is removably engaged with the positioning plate  31 . 
     Referring to  FIGS. 4 to 6 , when locking the bicycle lock, the user removes the lock rod  14  from the positioning plate  31  and pivots the first part  1 , the first protection member  13  and the lock rod  14  about the first bolt  4 , the lock rod  14  extends through the gap between spokes of the front or rear wheel and is inserted into the passage  22  of the second part  2 . The hook  26  of the second protection member  25  is located above the lock rod  14  as shown in  FIG. 6 . Even if the pin  26  is broken or removed from the second part  2  by the thief, the hook  252  cannot be accessed because the lock rod  14  blocks the hook  252  so that the bicycle lock cannot be damaged. 
     When unlocking the bicycle lock, the user uses a key (not shown) to rotate the lock core  24  to allow the lock rod  14  to be removed from the passage  22  as shown the status in  FIG. 4 . 
       FIGS. 7 to 9  show a second embodiment of the bicycle lock of the present invention, wherein the first part  1  is connected to the first cantilever brake boss A 1  by extending a first bolt  4  through a first path  11  in the first part  1 . A through hole  16  is defined through the first part  1  and perpendicularly communicates with the first part  11 . A first threaded hole  17  is defined in an underside of the first part  1  and communicates with the first path  11  and the through hole  16 . A first protection member  18  is threadedly connected to the first threaded hole  17 . A lock rod  14  extends through the through hole  16 . A first slot  15  is defined in a top of the first part  1 . 
     The second part  2  is connected to a second cantilever brake boss A 1  by extending a second bolt  5  through a second path  21  in the second part  2 . The second part  2  includes a passage  22  defined therein and a lock core  24  is received in the passage  22 . A second threaded hole  28  is defined in an underside of the second part  2  and communicates with the second path  21  and the passage  22 . A second protection member  29  is threadedly connected to the second threaded hole  28 . A second slot  27  is defined in a top of the second part  27 . 
     A substantially U-shaped reinforcement plate  3  has its two ends inserted into the first and second slots  15 ,  27  which are in communication with the first and second paths  11 ,  21 , the first and second bolts  4 ,  5  extending through the first and second paths  11 ,  21  and the two ends of the reinforcement plate  3  which is connected across the two cantilever brake bosses A 1 . A positioning plate  31  is connected to the reinforcement plate  3  and the lock rod  14  is removably engaged with the positioning plate  31 . 
     As shown in  FIGS. 10 to 13 , when locking the bicycle lock, the user removes the lock rod  14  from the positioning plate  31  and pivots the first part  1  and the lock rod  14  about the first bolt  4 . The lock rod  14  then extends through the gap between spokes of the front or rear wheel and is inserted into the passage  22  of the second part  2  to reach the locked status. In this embodiment, the first and second protection members  18 ,  29  are located outside of the first and second bolts  4 ,  5  as shown in  FIG. 12 ,  13 , so that the thief cannot use tool to access and damage. Besides, the thief cannot extend tool into the first and second threaded holes  17 ,  28  to damage the first and second protection members  18 ,  29  because the lock rod  14  blocks the first and second threaded holes  17 ,  28 . 
     When unlocking the bicycle lock, the user uses a key (not shown) to rotate the lock core  24  to allow the lock rod  14  to be removed from the passage  22  as shown the status in  FIG. 10 . 
     The bicycle lock can be installed to any bicycle frame and the user can easily operate the bicycle lock by using a key. The bicycle lock is secured on the bicycle frame so that the coating of the bicycle frame does not scratched by any moving part of the bicycle lock. Besides, the bicycle lock is located on the two sides of the bicycle frame so as to keep a proper aesthetic purpose. The bicycle lock is connected to the bicycle frame by two bolts and this is easy and convenient to any users. The protection members block the first and second bolts from access from outside of the bicycle lock, so that there will be no place for the thief to break the bicycle lock. The reinforcement plate effectively prevents tools such as saw or pliers from entering the gap between the first and second parts to break the bicycle lock. 
     While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.