Stoves and furnaces – Tool having fluid fuel burner – Soldering iron
Patent
1996-01-16
1998-06-30
Yeung, James C.
Stoves and furnaces
Tool having fluid fuel burner
Soldering iron
126413, 431255, 431256, B23K 302
Patent
active
057718814
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an ignition apparatus for igniting a gas catalytic combustion element, and the invention also relates to a gas powered heating tool comprising the ignition apparatus. In particular, the invention relates to but is not limited to a portable hand held gas powered soldering tool which comprises the ignition apparatus, although needless to say, the invention is not limited to a soldering tool.
Gas powered heating tools, and in particular, gas powered soldering tools in which a gas/air mixture is converted to heat by flameless combustion in a gas catalytic combustion element are known. For example, a hand held gas powered soldering tool is described in European Patent Specification No. EP-A-0,118,282. In the gas powered heating tool disclosed in this European specification, the soldering tool comprises a handle housing onto which a soldering body portion is connected. A combustion chamber housing extends rearwardly from the soldering body portion towards the handle housing and houses a gas catalytic combustion element. A gas/air mixture is delivered into the combustion chamber and passes through the catalytic combustion element. To ignite the catalytic combustion element, in other words, to raise the temperature of the catalytic combustion element to its ignition temperature, it is necessary initially to allow the gas/air mixture to pass into the combustion chamber and through the catalytic combustion element, and in turn through an exhaust port from the combustion chamber. The exhausting gas/air mixture is ignited and burns with a flame in the exhaust port. The root of the flame raises the temperature of a local portion of the catalytic combustion element to its ignition temperature and thereafter, the catalytic combustion element commences to convert the gas/air mixture to heat by flameless combustion. Once the entire catalytic combustion element is at its ignition temperature, the flame in the exhaust port extinguishes. While this construction of soldering tool is quite adequate, a disadvantage of the soldering tool is that in order to ignite the catalytic combustion element, it is necessary to manually ignite the gas/air mixture to burn with a flame in the exhaust port. This requires a flint, match or other suitable means for igniting the gas/air mixture. To minimise this inconvenience, the soldering tool disclosed in this European specification is provided with a cap in which a flint igniter is located for manually igniting the gas/air mixture. However, this does not overcome the problem that a separate operation is required for igniting the gas/air mixture to raise the combustion element to its ignition temperature.
A hand held gas powered soldering tool is sold under the trade name SUGAMOTO supplied by Radio Spares of Great Britain, in which the soldering tip portion is heated with a gas catalytic combustion element, and which also comprises a piezo electric ignition element for use in raising the temperature of the gas catalytic combustion element to its ignition temperature. The piezo electric ignition element is manually operated by an operating button located in the handle of the soldering tool for igniting the fuel gas to burn with a flame which is played on the gas catalytic combustion element for raising the temperature of the gas catalytic combustion element to its ignition temperature. However, in order to extinguish the flame after the gas catalytic combustion element has been raised to its ignition temperature, it is necessary to operate the gas supply on/off switch of the soldering tool for switching off the gas for in turn extinguishing the flame. Once the flame has been extinguished, the on/off switch is again operated to reinstate a flow of fuel gas to the catalytic combustion element.
This gas powered soldering tool suffers from a number of disadvantages. In particular, the operation of the soldering tool is relatively complicated, and furthermore, difficulty can be experienced in synchronising the operation of the piezo electr
REFERENCES:
patent: 4502465 (1985-03-01), Yoshinaga
patent: 4641632 (1987-02-01), Nakajima
patent: 4785793 (1988-11-01), Oglesby et al.
patent: 4805593 (1989-02-01), Hsu
patent: 5215076 (1993-06-01), Oglesby et al.
Brereton Patrick J.
Brett Damian
Griffin Michael J.
Normanly Michael P.
Oglesby Alfred P.
Oglesby & Butler Research and Development Limited
Yeung James C.
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