Child-resistant lighter

Abstract

A child-resistant lighter includes a main body, a wheel racket, a file wheel, a metal cap, and a lever is disclosed. The lever having an upward slant angle of α is within the range 10°≦α≦20° further includes a pressing part, a base, and a slipping hole. Both sides of the base furnish a salient part for acting as the pivot point of the lever, and the salient part is fitted into a securing hole provided at the bottom portion of the file wheel. The securing holes are used as the pivotal bearing seat for bearing the salient part. The pressing part having a slant surface forms an angle θ with respect to the lever and has a horizontal downward slant angle(θ-α). When it comes to use, the user exerts a force P by pressing on the slant surface of the pressing part and the file wheel with his/her thumb making the lighter generate flames. The effective force acting on the lever is P cos θ where the effective range of θ is 27°≦θ≦60°, thereby the range of the effective force is 0.5P≦P cos θ≦0.9P. Therefore, the child-resistant lighter of the invention is capable of preventing the children from carelessness or accidental igniting, thereby improving the safety efficacy of the child-resistant lighter. As a result, the lighter of the invention is capable of protecting the children from causing fire accident to achieve the efficacy of safety usage of the lighter. In this way, the lighter of the invention is capable of improving the efficacy of safety usage. Nevertheless, the exerting force P is still within the range of an adult user.

1 . A children-resistant lighter that includes a main body, a wheel racket, a file wheel, a metal cap, and a lever; the lever further includes a pressing part, a base, and a slipping hole, each side of the base furnishes a salient part used to be the pivot point C of the lever, and the salient parts are fitted in the securing holes near the bottom of the file-wheel seats, and the securing holes are used as pivot seat for bearing the salient parts; the lighter is characterized by that:
 the angle α being the horizontal upward slant angle is within a range of 10°≦α≦20° and the slant surface of the pressing part makes an angle θ with respect to the lever which makes a downward slant angle θ-α. if the exerting force of the user to exert force on the pressing part by his/her thumb is P, then the effective exerting force acting on the lever is P cos θ where the effective range of the angle θ is 27≦θ≦60°, thereby the range of effective exerting force is 0.5 P≦P cos θ≦0.9 P, thereby the lighter of the invention is capable of protecting the children from causing fire accident to achieve the efficacy of safety usage of the lighter, nevertheless, the exerting force P is still within the range of the ability of an adult user.   
   
   
       2 . The children-resistant lighter as claimed in  claim 1 , wherein the cross-section of the pressing part is in rhombus shape. 
   
   
       3 . The children-resistant lighter as claimed in  claim 1 , wherein the cross-section of the pressing part is in rectangular shape with a chamfered vertex angle. 
   
   
       4 . The children-resistant lighter as claimed in  claim 1 , wherein cross-section of the pressing part is in new-moon shape.