Abstract:
The present invention relates to a changeable combination lock disposed with a lock body; a lock bolt is disposed inside the said lock body; more than one digit wheels are sleeved on the said lock bolt; one end of the said lock body is disposed with a retaining ring; a notch is on the said retaining ring; a mark is disposed on the surface of the retaining ring for fitting in with the notch; an actuator and a retaining member are disposed on the said retaining ring; when in use, a set of combination is decided and the mark on the retaining ring is aligned with the said combination so that a lock bar inserts into a lock hole, therefore, the combination can be changed according to the need for preventing the intruder from easily unlocking the lock.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1) Field of the Invention  
           [0002]    The present invention relates to a changeable combination lock, a structure allows the combination to be changed according to the need and prevents the intruder from easily unlocking the lock so the user can obtain more protection in application.  
           [0003]    2) Description of the Prior Art  
           [0004]    Accordingly, the general combination lock of the prior art comprises a male lock body, a female lock body, a sealing ring, a retaining body, a ring sleeve, a digit disc and a lock chain ring; wherein the male lock body has several retaining teeth disposed on the upper end surface of a sleeve rod thereof; a concave portion is defined between two retaining teeth; a rectangular locating portion is disposed at one end of the sleeve rod of the said male lock body; a flange is disposed in a proper area of the said locating portion; a receiving segment is disposed on the adjacent side of the locating portion; a female lock body is a rod body disposed with a groove and a stop block with a through hole is disposed at one end thereof; a notch is connectively disposed opposite the upper aspect of the through hole; another receiving segment is disposed at another end of the rod body of the said female lock body; there are two sealing rings and the outer rim of one of them is disposed with a projecting alignment block in a proper area; a communicated hole is disposed among several digit discs; a notch is disposed in a proper area of the communicated hole; digits are carved on the outer periphery of the digit disc; a rectangular pass-through hole is disposed on the inner wall surface of the said sealing ring; a concave hole is disposed in a proper area on the inner periphery of the digit disc; a round hole is disposed between two retaining bodies and a retaining block is disposed in a proper area at one end surface thereof, two ring sleeves has a receiving chamber at one end thereof; a vertical hole and a horizontal hole are respectively disposed inside the ring sleeve; the vertical hole and the horizontal hole are communicated; a notch is disposed at the upper end of the horizontal hole; the inside of a locating sleeve is a square through hole; a locating block fitting in with the concave hole on the digit disc is disposed in a proper area on the outer rim thereof; a lock chain ring is a chain ring with a proper strength and has two retaining segments disposed at two ends.  
           [0005]    Thereby, after the locating sleeve is sleeved at one end of the male lock body, the sealing ring, a resilient element, the retaining body and the ring sleeve are sleeved on sequentially; one end of the loch chain ring is inserted into the vertical hole of the ring sleeve; through the push of the resilient element, the retaining block of the retaining body and the retaining segment mutually engage so as to position the male lock body, the sealing ring, the retaining body, the ring sleeve and one end of the lock chain ring; after that, the locating sleeve is sleeved onto the rod body of the female lock body, then several teeth discs, the sealing ring, the resilient element, the retaining body and the ring sleeve are mounted on the female lock body; the other end of the lock chain ring is inserted into the vertical hole; through the push of the resilient element, the retaining block engages in the retaining segment of the lock chain ring. However, since the said combination lock can only set one combination for unlocking the lock and the combination is set before the product is shipped from the factory, it is very easy for the outsiders to guess the combination and further unlock the lock.  
           [0006]    In view of the mentioned reasons, the inventor of the present invention, in order to improve the abovementioned shortcomings of the device structure of the prior art, strove to research and experiment for a long term, finally developed and designed the present invention of a changeable combination lock.  
         SUMMARY OF THE INVENTION  
         [0007]    The primary objective of the present invention is to provide a changeable combination lock with a design permitting the installer to easily change the combination for unlocking the lock and further achieving the objective of being a simple and practical invention for easy access.  
           [0008]    Another objective of the present invention is to provide a combination lock disposed with a lock body; a lock bolt is disposed in the said lock body; more than one digit wheels set are sleeved onto the lock bolt; a retaining ring is disposed at one end of the said lock body; a notch is on the said retaining ring; a mark is carved on the surface of the retaining ring for matching with the notch; an actuator and a retaining member are disposed on the said retaining ring; when in use, a set of combination is made according to the need by rotating the digit wheel to align the mark on the retaining ring with the said combination in a straight line; then a lock bar inserts into a lock hole to make the lock bolt pressed by the lock bar move toward the digit wheel sets; the cooperation of the actuator and the retaining member disengages the actuating member from the digit wheel sets; therefore, the action of changing the combination is accomplished; contrarily, it is only necessary to rotate the digit wheel to the preset combination to align with the mark on the retaining ring in a straight line, thereby the actuating member resumes to the original position; at the same time, the lock bolt moves from the notch on the retaining ring toward the lock hole to disengage the lock bolt retained on the lock bar from the lock bar; therefore, different from the combination lock of the prior art having only one set of combination, the user can continuously change the combination according to the need and further prevent the outsider from easily unlocking the lock.  
           [0009]    To enable a further understanding of the objective, the configuration, the device features and the efficiency of the present invention, the brief description of the drawings below is followed by the detailed description of the preferred embodiment. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0010]    [0010]FIG. 1 is an exploded and pictorial drawing of the present invention.  
         [0011]    [0011]FIG. 2 is a schematic drawing of the pictorial and external view of the present invention.  
         [0012]    [0012]FIG. 3 is a schematic drawing of the cross-sectional view of the assembled present invention.  
         [0013]    [0013]FIG. 4 is a schematic drawing of the action of releasing a lock bar of the present invention.  
         [0014]    [0014]FIG. 5 is a schematic drawing of the locking action of the present invention.  
         [0015]    [0015]FIG. 6 is the first schematic drawing of the action of the cut surface of a digit wheel of the present invention.  
         [0016]    [0016]FIG. 7 is the second schematic drawing of the action of the cut surface of a digit wheel of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0017]    Referring to FIGS. 1 and 2, the present invention is a changeable combination lock disposed with a lock body ( 10 ); the said lock body ( 10 ) is comprised by two case bodies ( 11 ) in the same shape, as shown in FIG. 2; two ends of the said lock body ( 10 ) are respectively disposed with two lock holes ( 12 ,  13 ); wherein, the lock hole ( 12 ) communicates with a concave slot ( 14 ) situated at the said end rim of the said lock body; a lock bar ( 20 ) fitting in with the lock hole ( 12 ) is disposed on the said lock body ( 10 ) and is an U-shaped bar in this embodiment (for those skilled in this art, other element can be used for replacement); one end of the said lock bar ( 20 ) is disposed with a pivot joint hole ( 21 ) permitting a insert pin ( 211 ) to insert into the pivot joint hole ( 21 ) and to be pivotally jointed in the lock hole ( 12 ) communicating with the lock body ( 10 ) and the concave slot ( 14 ); a resilient element ( 121 ) is disposed in the said lock hole ( 12 ), it is a spring in this embodiment; one end of the resilient element ( 121 ) pushes against the closed end of the lock hole ( 12 ); the other end thereof presses against the end rim of the lock bar ( 20 ) inserted in the lock hole ( 12 ); the other end of the said lock bar ( 20 ) is disposed with a concave and annular insert groove ( 22 ).  
         [0018]    A first and a second spaces ( 16 ,  17 ) adjacent to each other and divided by a partition ( 15 ) are disposed between two lock holes ( 12 ,  13 ) of the lock body ( 10 ); the ends of the said first and second spaces ( 16 ,  17 ), not adjacent to each other, are respectively adjacent to the lock holes ( 12 ,  13 ); wherein, one end of the first space ( 16 ) adjacent to the second space ( 17 ) is disposed with a opposite column cotter ( 161 ); a sleeve ( 30 ) situated over the first and second spaces ( 16 ,  17 ) is fixedly mounted on the column cotter ( 161 ); a stop plate ( 301 ) is disposed at one end of the sleeve ( 30 ); the other end of the stop plate ( 301 ) connects with a convex ear ( 31 ); a through hole ( 311 ) is disposed on the convex ear ( 31 ) for the column cotter ( 161 ) to insert; the other end of the said sleeve ( 30 ) is inserted onto the partition ( 15 ) adjacent to the lock hole ( 13 ); an axially extending open slot ( 32 ) passing through the inside thereof is disposed on the said sleeve ( 30 ); in the area adjacent to the lock hole ( 13 ), an adjacent annular groove ( 33 ) is disposed in a certain distance on the sleeve ( 30 ); an opening ( 34 ) radially extending but not through the whole sleeve ( 30 ) is disposed between the annular grooves ( 33 ).  
         [0019]    A resilient element ( 35 ) is sleeved on the said sleeve ( 30 ) and it is a spring in this embodiment; one end of the said resilient element ( 35 ) presses against onto the stop plate ( 301 ), the other end is attached by a bushing ( 36 ) sleeved on the said sleeve ( 30 ); more than one digit wheels ( 40 ) are sleeved on the sleeve ( 30 ); the said digit wheels ( 40 ) are installed in the second space ( 17 ) adjacent to the lock hole ( 13 ); a locating partition ( 171 ) capable of locating the digit wheel ( 40 ) is disposed on the inner wall of the said second space ( 17 ) for fixing the digit wheel ( 40 ) at its position and keeping it from deviating; the surfaces of the digit wheels ( 40 ) are disposed with consecutive digits ( 41 ), they are digits 0 to 9 in this embodiment; the side rims of the said digit wheels ( 40 ) just protrude in the fitting lock hole ( 13 ) on the lock body ( 10 ) for facilitating the user to rotate; a concave groove ( 42 ) is disposed respectively in the opposite area toward each digit in the digit wheel ( 40 ); a set of actuating member ( 50 ) is disposed respectively in the said digit wheels ( 40 ); a locating seat ( 51 ) is disposed on the said actuating member ( 50 ); the said locating seats ( 51 ) are respectively clamped between the sleeve ( 30 ) and the digit wheels ( 40 ); one end of the said locating seat ( 51 ) is disposed with a flange ( 511 ) contracting inwardly; the said flanges ( 511 ) are disposed respectively with a slide slot ( 512 ) extending axially; a live ring ( 52 ) is respectively attached on the said flanges ( 511 ) in flush with the other end; a resilient retainer ( 521 ) tightly attached onto the surface of the flange ( 511 ) is disposed on the said live rings ( 52 ); a concave opening ( 522 ) fitting in with the slide slot ( 512 ) is disposed on the said live rings ( 52 ); a locating point ( 513 ) is disposed on one end surface not contracting inwardly on the said locating seats ( 51 ); inside the said end of the said locating seats ( 51 ), a ring retainer ( 53 ) in an open form is disposed for the limiting function of the rotating locating seat ( 51 ).  
         [0020]    A lock bolt ( 60 ) is inserted at the end in an open form of the said sleeve ( 30 ); a locating step ( 611 ) fitting in with the digit wheel ( 40 ) is disposed on the said lock bolt ( 60 ); the said locating step ( 611 ) protrudes outwards from the inside of the opening slot ( 32 ) of the sleeve ( 30 ); a resilient element ( 61 ) is pressed against one end of the said lock blot ( 60 ) sleeved on the sleeve ( 30 ) and it is a spring in this embodiment; the other end of the resilient element ( 61 ) pushes against the inside of a closed end of the sleeve ( 30 ); the other end of the said lock bolt ( 60 ) is disposed with a retainer member ( 62 ) extending into the lock hole ( 13 ); a retaining hook ( 621 ) is disposed at the free end of the said retaining member ( 62 ); the said retaining hook ( 621 ) just retains on the insert slot ( 22 ) of the lock bar ( 20 ); a retaining ring ( 70 ) partially projecting in the slot hole ( 14 ) of the lock body ( 10 ) is disposed in the adjacent area between the said second space ( 17 ) and the lock hole ( 13 ); through the clamping of a C-shaped clamp ( 71 ) inserted in the annular slot ( 33 ) of the sleeve ( 30 ), the said retaining ring ( 70 ) is sleeved on the sleeve ( 30 ); a mark ( 72 ) is disposed on the periphery surface of the said retaining ring ( 70 ); a notch ( 73 ) corresponding to the said mark ( 72 ) and extending axially is disposed in the said retaining ring ( 70 ); an actuating member ( 74 ) inserted on the inner lateral rim of the retaining ring ( 70 ) is disposed on the side of the retaining ring ( 70 ) facing the digit wheel ( 40 ); a live retaining member ( 75 ) is disposed on the said actuating member ( 74 ); a toggle ( 76 ) is inserted in the said retaining ring ( 70 ); a concave opening ( 761 ) fitting in with the notch ( 73 ) is disposed on the said toggle ( 76 ).  
         [0021]    When in use, referring to FIGS. 1, 2,  3 ,  4 ,  5 ,  6  and  7 , first the digit wheel ( 40 ) is rotated to the preset digit ( 41 ) to make the locating point ( 513 ) of the locating seat ( 51 ) and the resilient retainer ( 521 ) on the live ring ( 52 ) move along to the concave groove ( 42 ) opposite the present digit ( 41 ) and the slide slot ( 512 ) on the locating seat ( 51 ) opposite the locating step ( 611 ) of the lock blot ( 60 ); then the mark ( 72 ) on the retaining ring ( 70 ) is rotated to align with the preset digit ( 41 ) in one straight line, thereby to make the notch ( 73 ) of the retaining ring ( 70 ) opposite the locating step ( 611 ) of the lock bolt ( 60 ); after that, the end of the lock bar ( 20 ) not pivotally jointed with the lock body ( 10 ) is inserted in the lock hole ( 13 ) to press and force the lock bolt ( 60 ) to smoothly slide passing the notch ( 73 ) and the slide slot ( 512 ); as it is moving toward the inside of the sleeve ( 30 ), the retaining member ( 75 ) on the retaining ring ( 70 ) is pressed and forced by the actuating member ( 74 ) to disengage the actuating member ( 74 ) and to press toward the locating seat ( 51 ), so as to press the said locating seats ( 51 ) to separate from the digit wheel ( 40 ); after that, the digit wheel ( 40 ) and the retaining ring ( 70 ) are rotated at will, as shown in FIGS.  3 ,  5  and  7 ; therefore, under the blocking of the locating seat ( 51 ), the lock bolt ( 60 ) does not tend to move outwards; furthermore, the retaining hook ( 621 ) of the retaining member ( 62 ) just retains onto the insert slot ( 22 ) of the lock bar ( 20 ) and the setting action is thereby accomplished.  
         [0022]    On the contrary, if trying to disengage one end of the lock bar ( 20 ) from the lock hole ( 13 ), it is only necessary to rotate the set digit ( 41 ) of the digit wheel ( 40 ) to a certain position, then rotate the mark ( 72 ) on the retaining ring ( 70 ) to align with the preset digit ( 41 ) in one straight line to make the notch ( 73 ) of the retaining ring ( 70 ) opposite the locating step ( 611 ) of the lock bolt ( 60 ); therefore, the lock bolt ( 60 ) moves toward the outside of the sleeve ( 30 ) to make the locating seat ( 51 ) move along back to the original position and further make the retaining hook ( 621 ), retained on the insert slot ( 22 ) of the lock bolt ( 20 ) and of the retaining member ( 62 ), separate from the lock bar ( 20 ), thereby unlock the lock, as shown in FIGS. 3, 4 and  6 .  
         [0023]    The mentioned embodiment of the present invention is only an exemplary description of one of the feasible implementations of the present invention, those who skilled in this art might be able to conduct various changes for the detail shapes with equal efficiency; however, those changes should be included in the spirit and the scope of the present invention.