Electric resistance heating devices – Heating devices – Continuous flow type fluid heater
Reexamination Certificate
2005-04-12
2005-04-12
Campbell, Thor (Department: 3742)
Electric resistance heating devices
Heating devices
Continuous flow type fluid heater
C392S485000
Reexamination Certificate
active
06879780
ABSTRACT:
The present invention relates to a method and device of inserting a coated electric heating wire (6) into a hot water tube (2) and to an apparatus for a sealing plug mounted at an end (1a) of said hot water tube (2). An end of a hot water tube (2), normally laid out in a zig-zag form under the floor of a room to be heated, is pipe-fitted to an outlet tube (3a) of a pump (3c) through a guide tube (2A). Said coated electric heating wire (6) is inserted through a guide hole (2h) with a 20˜30 degree slant to the guide tube (2A) and is connected to a ball-type guide member (5). The ball-type guide member is inserted into said hot water tube (2) in such a way as to achieve effective sealing of the interior sectional area of said hot water tube, and then a 10˜20 kg/cm2water pressure generated by the pump (3C) is applied in the direction of shaft center of the hot water tube to push forward the ball-type guide member (5) all the way up to the other end of the tube line, carrying with it the electric heating wire (6) through the inside of the long hot water tube (2). Using a sealing apparatus mounted at the end (1a) of the hot water tube (2) in which a power line (e1, e1′) and an electric heating wire (6, 6a) are coupled inside the wire channel (1h′), a sealing plug (1) in which a coated power line is placed is inserted into a plug (2) connecting the hot water tube. Then a crown nut (4) and a cap (5d) are connected and a temperature sensor (2S) is attached to a side of the hot water tube, the end (1a) of which is sealed with the sealing plug (1) so that electric power can be supplied to the electric heating wire (6, 6a) through the power line (e1, e1′).
REFERENCES:
patent: 2705874 (1955-04-01), Binder et al.
patent: 2877630 (1959-03-01), Schultz
patent: 5146633 (1992-09-01), Kim et al.
patent: 5371830 (1994-12-01), Wachenheim
patent: 5832179 (1998-11-01), Kim et al.
patent: 5859953 (1999-01-01), Nickless
patent: 6043455 (2000-03-01), Kurita
Campbell Thor
Creighton Wray James
Narasimhan Meera P.
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