Utility lighter

Abstract

A utility lighter includes a locking stopper fitted in a locker groove of a button body of an ignition button in an inwardly movable manner and a resilient element mounted between the locking stopper and the ignition button to normally urge and retain the locking stopper positioning between a pusher head of the ignition button and a locking flange of a piezoelectric unit housing of the utility lighter, so as to block an downwardly movement of the ignition button and prevent the ignition operation of the piezoelectric unit. In order to ignite the utility lighter, an adult user's thumb must intentionally push the locking stopper inwardly until the locking stopper is unblocked by the locking flange and then push down the ignition button at the same time.

What is claimed is:  
     
         1 . A utility lighter, comprising: 
 a casing having a liquefied gas storage, a piezoelectric unit housing and a pusher cavity defined therein;    a gas emitting unit extended from and communicated with said liquefied gas storage in said casing;    an elongated nozzle tube extended from said casing for encircling said gas emitting unit;    a piezoelectric unit fitted in said piezoelectric unit housing for generating piezoelectricity, wherein said piezoelectric unit comprises a movable operating part upwardly extended from said pusher cavity and an ignition tip extended adjacent to said gas emitting tip;    an ignition button which is slidably fitted in said pusher cavity of said casing and coupled with a top end of said piezoelectric unit, wherein said ignition button comprises a button body and a pusher head provided on top of said button body and exposing above said piezoelectric unit housing; and    a safety device comprising a locking flange provided at an edge portion of an outer wall of said piezoelectric unit housing, a locking stopper disposed between said button body, and said locking flange in an inwardly movable manner, and a resilient means mounted between said locking stopper and said ignition button for normally urging and retaining said locking stopper positioning between said pusher head and said locking flange of said piezoelectric unit housing so as to block a downward movement of said ignition button and prevent an ignition operation of said piezoelectric unit.    
     
     
         2 . A utility lighter, as recited in  claim 1 , wherein said ignition button is provided at a top side of said casing, which further comprises a handle portion, adapted for a user to hold said utility lighter with four fingers gripping around a bottom side of said handle portion of said casing and a thumb resting on said top side to operate said ignition button.  
     
     
         3 . A utility lighter, as recited in  claim 1 , wherein said locking flange is a top edge, having a predetermined thickness, of an outer wall of said piezoelectric unit housing.  
     
     
         4 . A utility lighter, as recited in  claim 2 , wherein said locking flange is a top edge, having a predetermined thickness, of an outer wall of said piezoelectric unit housing.  
     
     
         5 . A utility lighter, as recited in  claim 1 , wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.  
     
     
         6 . A utility lighter, as recited in  claim 2 , wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.  
     
     
         7 . A utility lighter, as recited in  claim 3 , wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.  
     
     
         8 . A utility lighter, as recited in  claim 4 , wherein said locking stopper comprises two guiding arms transversally extended from two inner sides of said pushing button thereof respectively, wherein said guiding arms are slidably received in two slider tracks respectively indented on two outer sidewalls of said button body transversally, so as to ensure said inward movement of said locking stopper with respect to said ignition button.  
     
     
         9 . A utility lighter, as recited in  claim 5 , wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.  
     
     
         10 . A utility lighter, as recited in  claim 6 , wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.  
     
     
         11 . A utility lighter, as recited in  claim 7 , wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.  
     
     
         12 . A utility lighter, as recited in  claim 8 , wherein a free end of each of said guiding arms forms a triangular engagement latch adapted for receiving in an engagement socket formed at an inner end of said respective slider track, wherein said two guiding arms are slidably extended underneath along said two slider tracks respectively to enable said two engagement latches being reachable with respect to said two engagement sockets respectively.  
     
     
         13 . A utility lighter, as recited in  claim 5 , wherein a locker groove is provided on a front side of said button body and said locking stopper, having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.  
     
     
         14 . A utility lighter, as recited in  claim 6 , wherein a locker groove is provided on a front side of said button body and said locking stopper, having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.  
     
     
         15 . A utility lighter, as recited in  claim 9 , wherein a locker groove is provided on a front side of said button body and said locking stopper, having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.  
     
     
         16 . A utility lighter, as recited in  claim 10 , wherein a locker groove is provided on a front side of said button body and said locking stopper having a shape and size adapted for fitting in said locker groove, further comprises a pushing button and a blocking tongue downwardly extended from said pushing button, wherein said locking stopper is normally positioned in a locking condition to block between said pusher head and said locking flange.  
     
     
         17 . A utility lighter, as recited in  claim 13 , wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.  
     
     
         18 . A utility lighter, as recited in  claim 14 , wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.  
     
     
         19 . A utility lighter, as recited in  claim 15 , wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.  
     
     
         20 . A utility lighter, as recited in  claim 16 , wherein said button body further has at least a side button wall downwardly extended from said pusher head and said movable operating part of said piezoelectric unit is extended to fit inside button body, wherein said resilient means comprises at least a compression having one end attached to said side button wall and another end urging against an inner surface of said pushing button so as to normally urge and retain said locking stopping positioning between said pusher head and said locking flange of said piezoelectric unit housing, unless a sideward force is applied to inwardly presses said pushing button until said blocking tongue is disaligned with said locking flange, and thus a downward force applied on said ignition button is able to push down said ignition button simultaneously to depress said movable operating part of said piezoelectric unit to ignite said utility lighter.  
     
     
         21 . A utility lighter, as recited in  claim 13 , wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.  
     
     
         22 . A utility lighter, as recited in  claim 14 , wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.  
     
     
         23 . A utility lighter, as recited in  claim 15 , wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.  
     
     
         24 . A utility lighter, as recited in  claim 16 , wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.  
     
     
         25 . A utility lighter, as recited in  claim 18 , wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.  
     
     
         26 . A utility lighter, as recited in  claim 20 , wherein said locker groove has a wider upper portion and a narrower lower portion and said pushing button having a shape and size adapted for fitting in said upper portion of said locker groove while said blocking tongue has a width narrower than a width of said pushing button for fitting in said lower portion of said locker groove.