US 5,799,648 AGranted

Gas powered heating device

AssigneeOglesby & Butler Research & Development Limited

InventorsAlfred P. Oglesby, John P. Oglesby

Life of this patent

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Abstract

A gas powered soldering tool (1) comprising a main body member (4) terminating in a soldering tip portion (8) has a combustion chamber (10) located therein. A gas catalytic combustion element (12) is located in the combustion chamber (10), and fuel gas is delivered into the combustion chamber (10) from a jet nozzle (15) and an air mixing venturi bore (17). A temperature responsive controller (28) for controlling the fuel gas supply to the jet nozzle (15) comprises a valve (39) having a valving member (58) which is operable by a permanent magnet (63) slidably located in a bore (64). A first member (70) of thermomagnetic material the Curie point of which is substantially similar to the temperature at which the main body member (4) is to be controlled is located at one end of the bore (64). The magnetic attraction between the first member (70) and the permanent magnet (63) is greater than the magnetic attraction between a second member (71) in the bore (64) and the permanent magnet (63) when the first member (70) is magnetic, thereby maintaining the valve (39) open, and vice versa when the first member (70) becomes non-magnetic for closing the valve (39).

A gas powered heating device comprising:

a main body member (4,85),
a combustion chamber (10) adjacent the main body member (4,85) within which gas is converted to heat for heating the main body member (4,85),
a jet means (15) for delivering fuel gas to the combustion chamber (10),
a fuel gas supply means (23,25) connected to the jet means (15) for supplying fuel gas to the jet means (15), and
a temperature responsive control means (28) for controlling the temperature of the main body member (4,85) around a predetermined temperature, the temperature responsive control means comprising:
a valve means (39) for controlling the supply of fuel gas from the fuel gas supply means (23,25) to the jet means (15),
a first member (70) of thermomagnetic material, the magnetic characteristic of which is a function of the temperature of the first member (70), the first member (70) being associated with the main body member (4,85) so that the temperature of the first member (70) is a function of the temperature of the main body member (4,85),
a second member (71) of magnetic material located spaced apart from the first member (70), and
a magnet means (63) operably associated with the valve means (39) for operation thereof, the magnet means (63) being moveable between the first member (70) and the second member (71) and being located in magnetic relationship with the first member (70) and the second member (71) so that the magnetic attraction between the second member (71) and the magnet means (63) is greater than the magnetic attraction between the first member (70) and the magnet means (63) for all positions of the magnet means (63) while the temperature of the first member (70) exceeds a temperature which is a function of the predetermined temperature for urging the magnet means (63) towards the second member (71) for operating the valve means (39) for controlling the flow of fuel gas to the jet means (15) for in turn controlling the temperature of the main body member (4,85) around the predetermined temperature.

6 more elements

Facts

Application

08/619,686Filed 1 Apr 1996

Priority

GB S9307331 Oct 1993

Granted

1 Sep 1998

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

F23N 5/02
Systems for controlling combustion: using devices responsive to thermal changes or to thermal expansion of a medium
B23K 3/022
Flame-heated soldering irons: using a gaseous fuel
G05D 23/015
Without auxiliary power: with mechanical sensing element not covered by groups G05D23/02 and G05D23/12
G05D 23/024
With sensing element expanding and contracting in response to changes of temperature: the sensing element being of the rod type, tube type, or of…

Abstract

Claims27