Stoves and furnaces – Tool having fluid fuel burner – Soldering iron
Patent
1996-04-01
1998-09-01
Price, Carl D.
Stoves and furnaces
Tool having fluid fuel burner
Soldering iron
126413, 126401, 126403, 2221462, B23K 302
Patent
active
057996482
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a gas powered heating device, for example, a soldering iron, a glue gun, a clothes pressing iron or the like, and in particular, the invention relates to a gas powered heating device of the type comprising a main body member, a combustion chamber within which gas is converted to heat for heating the main body member, a jet means for delivering fuel gas to the combustion chamber, a fuel gas supply means for supplying fuel gas to the jet means, and a temperature responsive control means for controlling the supply of fuel gas to the jet means in response to the temperature of the main body member.
2. Description of the Prior Art
In general, gas powered heating devices are provided with a working body member, for example, in the case of a gas powered soldering iron or a desoldering iron, the working body member forms the soldering or desoldering tip portion of the soldering iron. In the case of a glue gun, the working body member in general, forms an elongated hollow housing having a bore extending therethrough, which forms a chamber for accommodating an elongated plug of hot-melt glue for heating and melting the glue for discharge through a nozzle from the chamber. A clothes pressing iron, is provided with a working body member in the form of a hot plate. The main body member, in general, is secured or formed integrally with the working body member of such devices for providing good heat conduction between the main body member and the working body member.
In many cases, it is desirable to control the temperature of the working body member. In general, temperature control is achieved by providing a temperature responsive control means which controls the supply of fuel gas to the jet means in response to a temperature sensor. The temperature responsive control means may be of the type which reduces the flow rate of fuel gas to the jet means on the temperature of the working body member exceeding the desired level; or alternatively, isolates the flow of fuel gas to the jet means on the temperature of the working body member exceeding the desired temperature. The temperature sensor, in general is located for monitoring an appropriate temperature, typically, the temperature of the main body member or the working body member. In general, temperature sensors used in conjunction with such temperature responsive control means comprise a bi-metal strip or other temperature expandable material so that on the temperature of the bi-metal strip or temperature expandable material exceeding a certain value, the temperature responsive control means is activated for either reducing or isolating the flow of fuel gas to the jet means. Such temperature responsive control means which incorporate temperature sensors which include a bi-metal strip or other temperature expandable material, suffer from a number of disadvantages. In particular, they tend to be relatively slow to react, and furthermore, they tend to cycle between a relatively wide range of temperatures around the desired temperature. For example, in general, the temperature of the main body member or working body member may have well exceeded the desired temperature before the temperature responsive control means reacts to reduce or isolate the flow of gas to the jet means. Furthermore, because of their relative slowness to react, the temperature of the main body member and/or working body member may have fallen well below the desired temperature before the temperature responsive control means reacts to return the flow of fuel gas to the jet means to normal. This, can present significant problems in the case of soldering and desoldering irons, and also in the case of glue guns. A further disadvantage of the use of a bi-metal strip and other temperature expandable materials is that they must be factory set for controlling the temperature at the desired value due to inconsistencies from bi-metal strip to bi-metal strip and inconsistencies in the temperature expandable material. This is
REFERENCES:
patent: 2601579 (1952-06-01), Wittman
patent: 2678774 (1954-05-01), Arvin
patent: 4374528 (1983-02-01), Tittert
patent: 5178530 (1993-01-01), Roldan et al.
Oglesby Alfred P.
Oglesby John P.
Oglesby & Butler Research and Development Limited
Price Carl D.
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