Spiral fluorescent tube and method and device for manufacturing

Details Spiral fluorescent tube and method and device for manufacturing Spiral fluorescent tube and method and device for manufacturing

1995-03-17

1997-03-11

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313160, 313490, 313634, H01J 150, H01J 162, H01J 1716

Patent

active

056104766

ABSTRACT:
A fluorescent tube which is used for bulb-type fluorescent lamps is spirally wound, so that the effective length of the tube is increased. While a fluorescent tube is kept vertical, it is rotated and heated evenly at the part to be wound to a glass softening temperature or above by a heating device. The rotation of the fluorescent tube is stopped, and the part which is not facing a rod are heated. Then, the tube is clamped from a horizontal direction by a pair of clamps, and is wound around the rod at least 2.5 times by rotating the clamp arms in opposite directions while the arms gradually shift away from each other.

REFERENCES:
patent: D280345 (1985-08-01), Paget
patent: 4772819 (1988-09-01), Ridders
patent: 4871944 (1989-10-01), Skwirut

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