Combustion – Flame holder and fuel tank assembly
Patent
1995-01-26
1996-12-03
Yeung, James C.
Combustion
Flame holder and fuel tank assembly
251 11, 251337, F23D 1428
Patent
active
055802400
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a combustion nozzle for a gas lighter and particularly to a nozzle structure having an internal, automatic flame extinguishing device.
2. Background Art
Heretofore, gas lighters of various structures have been proposed. One of them is a gas lighter having an automatic flame extinguishing device incorporated therein, the automatic flame extinguishing device using a coiled shape memory alloy or the like disposed in the interior of the gas lighter to close a gas flow path for the extinguishment of flame when combustion continues for a time longer than necessary, with a view to preventing the occurrence of a possible accident, (refer, for example, to Japanese Utility Model Application No.98519/90).
FIG. 8 is a partial sectional view of a combustion nozzle and the vicinity thereof in a conventional gas lighter with an automatic flame extinguishing device incorporated therein.
The lighter illustrated in FIG. 8 is of a file-ignition flint type. As to the automatic flame extinguishing device, it is also the case with a piezo-ignition type.
Fuel gas is stored within a fuel tank 1. When the lighter is in use, the lighter gas flows out through a gas outlet hole 3 while the flow rate thereof is restricted by means of a flow rate control member 2. On the other hand, when the lighter is not in use, a first valve 4 fixed to the bottom of a nozzle cylinder 5 closes the gas outlet hole 3, the nozzle cylinder 5 being urged by means of a spring (not shown).
An ignition flint 11 is kept in pressure contact with a file 10 by means of a flint pushing spring 12. When the user of the lighter rotates the file 10, the ignition flint 11 is scraped off while generating heat, resulting in burning as sparks, which are scattered above a gas blow-off hole 5a. Further, when the user depresses one end (not shown) on the right-hand side in FIG. 8 of a gas valve opening lever 9, simultaneously with the rotation of the file 10, the opposite end, indicated at 9a, of the lever 9 rises, whereby the nozzle cylinder 5, which is engaged with the lever 9, is lifted. As a result, the first valve 4 is also lifted together with the nozzle cylinder 5 because it is fixed to the nozzle cylinder 5 through a bottom plug 6, whereby the gas outlet hole 3 is opened, so that the fuel gas in the fuel tank 1 passes through the gas outlet hole 3, flows along the side face of the nozzle cylinder 5, then enters the interior of the nozzle cylinder from a lateral hole 5b, passes through an internal fuel gas passage 5c of the nozzle cylinder and blows off from the gas blow-off hole 5a. At this time, the gas is ignited by the foregoing sparks to form a flame. An O-ring 7 is held in a position between the tank wall and the nozzle cylinder 5 by means of a cap 8 to prevent the fuel gas from leaking to the exterior from the outer periphery of the nozzle cylinder 5 while the lighter is in use.
In the interior of the nozzle cylinder 5 are mounted a shape memory alloy coil 14, a second valve 13 and a return spring 15, to constitute an automatic flame extinguishing device.
A lower portion 14a of the shape memory alloy coil 14 is press-fitted on a bottom plug 6, the bottom plug 6 being fitted into the nozzle cylinder 5 from the bottom side of the same cylinder, while the second valve 13 is press-fitted and fixed into an upper end 14b of the shape memory alloy coil 14. The return spring 15 is disposed in a position in which it pushed back the second valve 13 downward. Upon ignition of the fuel gas which has brown off from the gas blow-off hole 5a in the manner described above, the temperature of the nozzle cylinder 5 rises, and if it exceeds a predetermined level in the event of occurrence of an abnormal continuous combustion, the shape memory alloy coil 14 expands and pushes the second valve 13 upward, so that a portion 5d to be closed of the internal fuel gas passage 5c, which portion is located halfway of the same passage, is closed by the second valve 13. As a result, the ejection of the fuel gas from the gas bl
REFERENCES:
patent: 3205675 (1965-09-01), Matthies
patent: 3856259 (1974-12-01), Doherty, Jr.
Kubovcik, Esq. R. J.
Yeung James C.
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