EP 0255638 B1 19930505 - INCANDESCENCE LAMP AND MANUFACTURING OF ITS TUBULAR ENVELOPE
Title (en)
INCANDESCENCE LAMP AND MANUFACTURING OF ITS TUBULAR ENVELOPE
Publication
Application
Priority
HU 337786 A 19860806
Abstract (en)
[origin: EP0255638A2] The invention relates to a support (3) for fixing the spirals (2) of gas-filled incandescent lamps having a tubular envelope (1) and with flattened ends, and a method of manufacturing the support (3) and placing it in the envelope. The support (3) according to the invention is provided with a spiral first section, whose length exceeds at least one complete turn pitch and which presses on the inner wall of the tubular envelope (1), and a second section which connects onto the first section and whose length likewise exceeds at least one turn pitch, and which second section surrounds the spiral (2) and whose internal diameter is greater than the external diameter of the spiral (2) arranged in its interior. During manufacture and during insertion of the support (3) in the tubular envelope (1), one end of a flexible metal wire is mounted on a mandrel (5) provided with an insert (6), the wire is wound on the mandrel (5) and on the insert (6) for a length which in each case exceeds at least one turn pitch, the wire is then cut to length and the tubular envelope (1) is pushed onto the mandrel (5) provided with the wire, after which the mounted wire end is released and the mandrel is pulled back. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
H01K 1/24 (2013.01)
Designated contracting state (EPC)
AT CH DE GB IT LI NL SE
DOCDB simple family (publication)
EP 0255638 A2 19880210; EP 0255638 A3 19891129; EP 0255638 B1 19930505; AT E89100 T1 19930515; DE 3785703 D1 19930609; HU 195707 B 19880628; HU T44359 A 19880229; JP S6348741 A 19880301
DOCDB simple family (application)
EP 87110420 A 19870717; AT 87110420 T 19870717; DE 3785703 T 19870717; HU 337786 A 19860806; JP 19455887 A 19870805