Abstract:
A universal trailer lock including an upper housing, a lower housing, a lock barrel set and a latch. A limit separator is further included, wherein the limit separator is provided to embed into a limiting groove of the upper housing. By the composition of above structure, the universal trailer lock may applied to trailer couplers with different specifications for effectively prevent trailers from being stolen.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    a) Field of the Invention 
         [0002]    The invention relates to a universal trailer lock and, more particularly, a universal trailer lock for tightly locking on a trailer coupler, which is applied to trailer couplers with different specifications for effectively prevent trailers from being stolen.
       b) Description of Prior Art       
 
         [0004]    For preventing from being stolen, a trailer lock  2  is usually used to lock on a coupler in front of the trailer. Since couplers may be roughly divided into three specifications: large size, medium size and small size, a general trailer lock applied for a medium-sized or small-sized coupler  1  could not be provided for large-sized coupler  1  to lock, otherwise, a trailer lock applied for a large-sized coupler  1  could not be provided for a medium-sized or small-sized coupler to lock. The following problem may be caused in this condition: 
         [0005]    1. For the market demand for the use, manufacturers may produce trailer lock  2  with at least two different specifications, thus, preparation costs and inventory space may significantly increase. 
         [0006]    2. For dealers, there are many specifications of trailer locks made by various manufacturers, however, other related goods may also be displayed in limited space, the products with various specifications may only be occupied display space of other products, and stored space may also increase, so that purchase intention of dealers may be affected. 
         [0007]    3. For users, while changing to another trailer, if specification of the couplers  1  are different, the trailer lock  2  should be changed, it is not eligible for benefits. 
       SUMMARY OF THE INVENTION 
       [0008]    In view of this, the inventor finally completes the universal trailer lock of the present invention after numerous improvements, namely, the object of the present invention is to provide a universal trailer lock for tightly locking on a trailer coupler, which is applied to trailer couplers with different specifications for effectively prevent trailers from being stolen. 
         [0009]    To achieve the above object according to the invention, an universal trailer lock of the present invention is consisted of an upper housing, a lower housing, a lock barrel set and a latch. 
         [0010]    The upper housing, which includes a concave space, two side arms are extended from two sides of the upper housing respectively, a limiting groove is set on each side arm. 
         [0011]    The lower housing, which is provided to set on the upper housing correspondingly, a lock barrel chamber, a locking block chamber and a latch through hole are set inside the lower housing, a side of the lock barrel chamber is communicated with the locking block chamber, a first elastic element and a locking block are set in the locking block chamber, an locking part is set on an end of the locking block, and a groove is set on a peripheral edge of the locking block. 
         [0012]    The lock barrel set, which is placed in the lock barrel chamber, the lock barrel set includes a lever for inserting into the groove of the locking block, to drive the locking block for sliding. 
         [0013]    The latch, which is a rod body, is provided to insert into the latch through hole of the lower housing, at least a slot set on a peripheral edge of the latch is provided for the locking part of the locking block to embed into for locking. 
         [0014]    The upper housing, at least a fixing hole is set on its side arm. 
         [0015]    The latch, a fastening slot is set on a side of the latch, which is provided for a C-type elastic fastener to fix on it. 
         [0016]    The universal trailer lock of the present invention further includes a limit separator, a through hole is set in the center of the limit separator, two embedded parts are respectively set on two sides of the limit separator to embed into the limiting grooves of the upper housing, at least a positioning hole is set on the limit separator. 
         [0017]    The lower housing, at least a ball pocket is set on it, a positioning set is placed inside the ball pocket, the positioning set is consisted of a ball, a second spring and a fixed block. 
         [0018]    At least a fixing hole is set on two sides of the lower housing, the fixing hole is corresponded to the fixing hole of the side arms of the upper housing for a corresponding fixed element to insert into to fasten. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]      FIG. 1  is a three-dimensional schematic diagram of a conventional trailer lock; 
           [0020]      FIG. 2  is a three-dimensional schematic diagram of the present invention; 
           [0021]      FIG. 3  is a three-dimensional exploded diagram of the present invention; 
           [0022]      FIG. 4  is a three-dimensional schematic diagram of the lower housing of the present invention; 
           [0023]      FIG. 5  is a three-dimensional diagram ( 1 ) of the present invention; 
           [0024]      FIG. 6  is a three-dimensional schematic diagram ( 2 ) of the present invention; 
           [0025]      FIG. 7  is a schematic diagram ( 1 ) of the lock mode of the present invention; 
           [0026]      FIG. 8  is a schematic diagram ( 2 ) of the lock mode of the present invention; 
           [0027]      FIG. 9  is a I-I cross-sectional schematic diagram of  FIG. 8  of the present invention; 
           [0028]      FIG. 10  is a schematic diagram of the operation of the positioning set of the present invention; and 
           [0029]      FIG. 11  is a schematic diagram of unlocking mode of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0030]    Please refer to  FIG. 2  to  FIG. 6 , the universal trailer lock  3  of the present invention, which is consisted of an upper housing  31 , a lower housing  32 , a lock barrel set  34  and a latch  37 . 
         [0031]    The upper housing  31  includes a concave space  310 , two side arms  311  are extended from two sides of the upper housing  31  respectively, at least a fixing hole  312  and a limiting groove are set on each side arm  311 . 
         [0032]    The lower housing  32  is set on the upper housing  31  correspondingly, a lock barrel chamber  321 , a locking block chamber  322  and a latch through hole  323  are set inside the lower housing  32 , a side of the lock barrel chamber  321  is communicated with the locking block chamber  322 , a first elastic element S 1  and a locking block  35  are set in the locking block chamber  322 , an locking part  351  is set on an end of the locking block  35 , and a groove  352  is set on a peripheral edge of the locking block  35 . 
         [0033]    The lock barrel set  34 , which is placed in the lock barrel chamber  321 , the lock barrel set  34  includes a lever  341  for inserting into the groove  352  of the locking block  35 , to drive the locking block  35  for sliding (the structure of the lock barrel set  34  is prior art, not described in details here.) 
         [0034]    The latch  37 , which is a rod body, is provided to insert into the latch through hole  323  of the lower housing  32 , a fastening slot  371  is set on a side of the latch  37 , the fastening slot  371  is provided for a C-type elastic fastener  38  to fix on it, at least a slot  372  set on a peripheral edge of the latch  37  is provided for the locking part  351  of the locking block  35  to embed into for locking. 
         [0035]    The present invention further includes a limit separator  33 , a through hole  331  is set in the center of the limit separator  33 , two embedded parts  332  are respectively set on two sides of the limit separator  33  to embed into the limiting grooves  313  of the upper housing  31 , at least a positioning hole D is set on the limit separator  33 . 
         [0036]    The lower housing  32 , at least a ball pocket  324  is set on it, which is corresponded to the at least a positioning hole D of the limit separator  33 , a positioning set  36  is placed inside the ball pocket  324 , the positioning set  36  is consisted of a ball B 1 , a second spring S 2  and a fixed block B 2 . The ball B 1  is embedded into the positioning hole D for limiting (as shown in  FIG. 10 ). 
         [0037]    The lower housing  32 , at least a fixing hole  325  is set on its two sides, the fixing hole  325  is corresponded to the fixing hole  312  of the side arms  311  of the upper housing  31  for a corresponding fixed element A to insert into to fasten. 
         [0038]    By the composition of above elements, if the coupler  4  in front of a trailer is large-sized (please refer to  FIG. 5  and  FIG. 7 ), the limiting groove  313  of the upper housing  31  is provided to place an edge portion  41  of the coupler  4 , thus the limit separator  33  could not be used, at this time, the limit separator  33  could be took out from the limiting groove  313  first. If the coupler  4  is medium-sized or small-sized, the limit separator  33  should be used (please refer to  FIG. 6  and  FIG. 8 ), the concave space  310  of the upper housing  31  is provided to place the edge portion  41  of the coupler  4 , and the limit separator  33  could be limited without escaping the limiting groove  313  of the upper housing  31  by embedding the ball B 1  of the positioning set  36  into the positioning hole D. 
         [0039]    In the present invention, when locking, no matter what the coupler  4  is a large-sized, medium-sized or small-sized specification, its edge portion  41  may be corresponded to the concave space  310  of the upper housing  31  (for a medium-sized, small-sized specification, please refer to  FIG. 8 ), or to the limiting groove  313  (for large-sized specification, please refer to  FIG. 7 ). And then a user could insert a key K to rotate the lock barrel set  34 , the lever  341  is driven to push the locking block  35  sliding, at this time, the first elastic element S 1  helps the locking block  35  pushing outwards by its elasticity, and the locking part  351  is embedded into the slot  372  of the latch  37 , and the locking mode is implemented (a medium-sized, small-sized coupler is illustrated as an locking example herein, as shown in  FIG. 8  and  FIG. 9 ). 
         [0040]    In the present invention, when unlocking (please refer to  FIG. 11 , a medium-sized, small-sized coupler is illustrated as an unlocking example herein), a user insert the key k to reversely rotate the lock barrel set  34  first, the lever  341  is driven to push the locking block  35  sliding reversely, the locking block  35  compresses the first elastic element S 1 , the locking part  351  exits the slot  372  of the latch  37 , and the unlocking mode is implemented.