Patent Publication Number: US-2023134746-A1

Title: Door Lock

Description:
FIELD OF THE INVENTION 
     The present invention relates to a door lock which is operated easily. 
     BACKGROUND OF THE INVENTION 
     A conventional door lock does not have the function of idling lock, which makes it difficult to open the door when escaping, thus causing the disadvantage of trapping 
     The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. 
     SUMMARY OF THE INVENTION 
     The primary aspect of the present invention is to provide a door lock by which the head of the door lock actuates the first engagement portion to engage with or remove from the groove of the first clutch element so that the limitation protrusion of the second clutch element guides the drive gear to actuate the gear assembly, and the gear assembly meshes with the toothed section of the guide rod or rotates idly, such that after the toothed section of the guide rod is actuated by the gear assembly and the key is rotated clockwise or counterclockwise, the tongue is controlled by the key to retract inward or extend back to an original position, wherein when the key is rotated idly, the motor drives the tongue to unlock a door easily. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view showing the assembly of a door lock according to a preferred embodiment of the present invention. 
         FIG.  2    is a perspective view showing the exploded components of the door lock according to the preferred embodiment of the present invention. 
         FIG.  3    is a side plan view showing the operation of the door lock according to the preferred embodiment of the present invention. 
         FIG.  4    is a cross sectional view showing the operation of the door lock according to the preferred embodiment of the present invention. 
         FIG.  5    is another cross sectional view showing the operation of the door lock according to the preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIGS.  1 - 5   , a door lock according to a preferred embodiment of the present invention comprises: 
     a casing  10  including a first connection part  11  and a second connection part  12 ; 
     a head  20  connected with the first connection part  11  and including a retainer  21  formed on an outer wall of the head  20 , a first engagement portion  22  formed on a first end of the head  20  and corresponding to the casing  10 , a receiving orifice  23  defined on a second end of the head  20 , wherein the receiving orifice  23  is configured to receive a key  24 ; 
     a first clutch element  30  including a groove  31  defined on a first end of the first clutch element  30  and corresponding to the first engagement portion  22  of the head  20 , wherein when the groove  31  of the first clutch element  30  is engaged with the first engagement portion  22 , the first clutch  30  is connected with the first connection part  12  of the casing  10 ; 
     a second clutch element  50  located opposite to the first clutch element  30 , and the second clutch element  50  including a driving orifice  51  formed on a center of the second clutch element  50 , a limitation protrusion  52  extending from an outer wall of the second clutch element  50 , and an abutting segment  53  extending from an end of the second clutch element  50  opposite to the driving orifice  51 ; 
     a drive gear  60  located opposite to the second clutch element  50  and including a defining trench  61  configured to engage with or remove from the limitation protrusion  52  of the second clutch element  50 ; 
     a gear assembly  70  fixed opposite to the drive gear  60 , and the gear assembly  70  including a driven gear  71 , a motor  72 , a transmission gear  73  mounted on an end of the motor  72 , a first meshing gear  74  configured to mesh with the transmission gear  73 , and a second meshing gear  75  configured to mesh with the first meshing gear  74 ; 
     a guide rod  80  including a toothed section  81  configured to mesh with the drive gear  60 , an actuation post  82  arranged on a first end of the guide rod  80 , a guiding stem  83  connected with the actuation post  82 , a tongue  84  formed on the guiding stem  83  opposite to the actuation post  82 , and a resilient element  85  secured on a side of the tongue  84  opposite to the gear assembly  70 ; 
     a locking column  40  including a cross section formed in a square shape and inserted through the second clutch element  50 , the drive gear  60 , and the gear assembly  70 ; 
     a holder  90  including an extending sheet  91  extending from a first end of the holder  90  opposite to the tongue  84 , a fixing orifice  92  passing through the extending sheet  91  and the holder  90  and connected with the tongue  84 , a fitting sleeve  94  fitted on a second end of the holder  90  and connected with the gear assembly  70 , a first through orifice  95  defined on a center of an end of the fitting sleeve  94  and receiving the locking column  40 , a second engagement portion  93  extending from the second end of the holder  90 , a second through orifice  96  defined on a side wall of the fitting sleeve  94  opposite to the holder  90 , and a cutout  97  defined beside and communicating with the second through orifice  96  so as to engage with the second engagement portion  93  of the holder  90 . 
     In operation, the head  20  of the door lock actuates the first engagement portion  22  to engage with or remove from the groove  31  of the first clutch element  30  so that the limitation protrusion  52  of the second clutch element  50  guides the drive gear  60  to actuate the gear assembly  70 , and the gear assembly  70  meshes with the toothed section  81  of the guide rod  80  or rotates idly. After the toothed section  81  of the guide rod  80  is actuated by the gear assembly  70  and the key  24  is rotated clockwise or counterclockwise, the tongue  84  is controlled by the key  24  to retract inward or extend back to an original position, wherein when the key  24  is rotated idly, the motor  72  drives the tongue  84  to unlock a door. 
     While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention and other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.