Electronic ignition gun

An electronic ignition gun includes a casing holding a fuel gas container, a battery and a high voltage circuit on the inside, the fuel gas container having a gas outlet valve and a pull tab coupled to the gas outlet valve, a push-button switch mounted in a hole on the casing and depressed to drive the pull tab in opening the gas outlet valve for letting fuel gas be discharged out of the fuel gas container through a gas nozzle via a gas tube and to simultaneously close the circuit between the high voltage circuit and the battery, causing the high voltage circuit to discharge a high voltage in producing sparks for igniting discharged fuel gas, and safety lock means, which stops the push-button switch from operation.

BACKGROUND OF THE INVENTION 
The present invention relates to an electric ignition gun, and more 
particularly to an electric ignition gun that can easily be operated to 
catch fire by depressing a push-button switch. 
FIG. 1 shows an electronic ignition gun according to the prior art. This 
electronic ignition gun includes a casing 1 having a sliding slot 11 at 
one side, and a sliding switch 12 mounted on the casing 1 and moved back 
and forth in the sliding slot 11. The sliding switch 12 comprises a handle 
121 disposed outside the casing 1, a substantially L-shaped stop plate 122 
coupled to the handle 121 and disposed inside the casing 1. The stop plate 
122 has one end coupled to the handle 121, and an opposite end terminating 
in a stop wall 1221. The casing 1 defines a storage chamber 13, which 
holds a fuel gas container 14. The fuel gas container 14 has a gas outlet 
valve connected to a flexible gas tube 142. The flow rate of the gas 
outlet valve of the fuel gas container 14 is controlled by a gas flow rate 
control 141. A coupling plate 143 is provided having one end coupled to 
the connecting area between the gas outlet valve of the fuel gas container 
14 and the flexible gas tube 142, and an opposite end mounted with a 
spring 144. The spring 144 has one end connected to the coupling plate 
143, and an opposite end situated above the stop wall 1221 of the stop 
plate 122. The opposite end of the flexible gas tube 142 is connected with 
a metal gas nozzle 145, having a front end on which is mounted with a gas 
flow buffer spring 146. The gas flow buffer spring 146 buffers the flowing 
speed of discharged fuel gas, enabling discharged fuel gas to be well 
mixed with air. The casing 1 further comprises a locating groove 15 on the 
inside at its front end, which receives the metal gas nozzle 145. The 
front end of the casing 1 is mounted with a metal flame nozzle 17. A 
piezoelectric igniter 18 is mounted in the casing 1 and coupled to the 
stop plate 122 of the sliding switch 12, and has two electric wires 2 
respectively extended from its two opposite terminals and respectively 
connected to the metal gas nozzle 145 and the metal flame tube 17. When 
the sliding switch 12 is pushed in one direction, the coupling plate 143 
is forced to pull the flexible gas tube 142, causing fuel gas to flow out 
of the gas outlet valve of the fuel gas container 14 through the flexible 
gas tube 142 to the metal gas nozzle 145, and at the same time the 
piezoelectric igniter 18 is driven to discharge a high voltage through the 
metal gas nozzle 145 and the metal flame tube 17 via the electric wires 2, 
thereby causing sparks to be produced in the space between the metal gas 
nozzle 145 and the metal flame tube 17, and therefore discharged fuel gas 
is ignited at the front end of the metal gas nozzle 145. Because the 
operation of the piezoelectric igniter 18 and the discharging of fuel gas 
from the fuel gas container 14 are controlled by the sliding operation of 
the sliding switch 12, the user must employ much effort to move the 
sliding switch 12 when operating the electronic ignition gun. If 
insufficient push force is applied to the sliding switch 12, the 
piezoelectric igniter 18 cannot be positively triggered to discharge a 
high voltage. 
SUMMARY OF THE INVENTION 
The present invention has been accomplished to provide an electronic 
ignition gun which eliminates the aforesaid problem. According to one 
aspect of the present invention, the electronic ignition gun comprises a 
casing holding a fuel gas container, a battery and a high voltage circuit 
on the inside, the fuel gas container having a gas outlet valve and a pull 
tab coupled to the gas outlet valve, and a push-button switch mounted in a 
hole on the casing, wherein when the push-button switch is depressed, the 
pull tab is driven to open the gas outlet valve for letting fuel gas be 
discharged out of the fuel gas container through a gas nozzle via a gas 
tube, and at the same time the open circuit between the high voltage 
circuit and the battery is closed by a metal contact plate at the bottom 
side of the push-button switch, causing the high voltage circuit to 
discharge a high voltage in producing sparks for igniting discharged fuel 
gas. According to another aspect of the present invention, a safety lock 
means is provided to stop the push-button switch from operation. The 
push-button switch is allowed to be depressed only when the safety lock 
means is unlocked.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIGS. 2 and 3, an electronic ignition gun in accordance with 
the present invention is generally comprised of a casing 3 defining a 
receiving chamber 30, a fuel gas container 5 and a high voltage circuit 7 
mounted in the receiving chamber 30 inside the casing 3. The fuel gas 
container 5 comprises a gas filling valve 50 at its bottom side, and a gas 
outlet valve 51 at its top side. A flexible gas tube 53 is connected 
between the gas outlet valve 51 and a metal gas nozzle 55 positioned in a 
hole 31 at the front end of the casing 3. The metal gas nozzle 55 has a 
front gas outlet on which is mounted a gas flow buffer spring 57. The gas 
flow buffer spring 57 buffers the flowing speed of discharged fuel gas, 
enabling discharged fuel gas to be well mixed with air. A metal flame tube 
33 is fastened to the front end of the casing 3 around the metal gas 
nozzle 55. The metal flame tube 33 has a flame output hole 331 at its 
front end, and a plurality of air vents 333 spaced around the periphery 
adjacent to the flame output hole 331. An insulative bushing, for example 
a ceramic bushing 334, is mounted within the flame tube 33 around the 
metal gas nozzle 55. A gas flow rate control 58 is coupled to the gas 
outlet valve 51 of the fuel gas container 5, and operated to regulate the 
flow rate of fuel gas. The gas flow rate control 58 has a part that 
extends out of a hole in the casing 3 to permit manual operation. A pull 
tab 59 is pivoted to the gas outlet valve 51 of the fuel gas container 5. 
The high voltage circuit 7 has one end connected to the metal gas nozzle 
55, and an opposite end connected to one end of a power supply device for 
example a battery 71 positioned in a receiving chamber 30 of the casing 3, 
by a lead wire. The opposite end of the battery 71 is connected to the 
metal flame tube 33 by a lead wire. 
A push-button switch 303 is mounted in a hole 301 at the casing 3, and 
spaced above the pull tab 59. One end of the bottom side of the 
push-button switch 303 is pivoted to a rod (not shown) inside the casing 
3. The other end of the bottom side of the push-button switch 303 is 
connected to one end of a spring element 3031. The other end of the spring 
element 3031 is connected to a recessed seat 305 in the receiving chamber 
30 inside the casing 3. An arched metal contact plate 3032 is fixedly 
fastened to the bottom side of the push-button switch 303. An open circuit 
20 is provided at the lead wire between the high voltage circuit 7 and the 
battery 71 adjacent to the metal contact plate 3032. When the push-button 
switch 303 is depressed, the metal contact plate 3032 is lowered to 
contact the two opposite ends of the open circuit 20, causing the high 
voltage circuit 7 and the battery 71 to be electrically connected, and at 
the same time the pull tab 59 is forced by the push-button switch 303 to 
open the gas outlet valve 51 of the fuel gas container 50, enabling fuel 
gas to flow out of the fuel gas container 50. Further, a lid 304 covers on 
the casing 3 to hold the battery 71 inside the casing 3. 
Referring to FIGS. 4 and FIG. 3 again, the casing 3 comprises a sliding 
rail 37 on the inside adjacent to the push-button switch 303. A stop plate 
38 is mounted on the sliding rail 37. A spring element 381 is provided 
having one end connected to the stop plate 38 and an opposite end fastened 
to a recessed seat 307 inside the casing 3. The spring element 381 imparts 
a forward pressure to the stop plate 38, causing the stop plate 38 to stop 
the push-button switch 303 from downward movement. Therefore, the 
push-button switch 303 can be operated only when the stop plate 38 is 
pushed backwards from the push-button switch 303. 
Referring to FIG. 2 again, the casing 3 comprises a longitudinal peephole 
39 through which the user can visually check the volume of fuel gas in the 
fuel gas container 5. When fuel gas is going to be used up, a new supply 
of fuel gas can be filled in the fuel gas container 5 through the gas 
filling valve 50. 
Referring to FIGS. from 2 through 5 again, the stop plate 38 is forced by 
the spring element 381 to stop the push-button switch 303 from downward 
movement, preventing the push-button switch 303 from being operated (see 
FIG. 3). When in use, the stop plate 38 is pushed away from the 
push-button switch 303 (see FIG. 4), then the push-button switch 303 is 
depressed to force the metal contact plate 3032 into contact with the two 
opposite ends of the open circuit 20 (see FIG. 5), enabling the high 
voltage circuit 7 to be electrically connected to discharge a high voltage 
through the metal gas nozzle 55 and the metal flame tube 33. As a resutt 
sparks are produced in the space between the metal gas nozzle 55 and the 
metal flame tube 33 to ignite discharged fuel gas from the metal gas 
nozzle 55. 
While only one embodiment of the present invention has been shown and 
described, it will be understood that various modifications and changes 
could be made thereunto without departing from the spirit and scope of the 
invention disclosed.