Method for producing helically wound filament elements, and filament elements produced according to this method
AssigneePatent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
InventorsJuergen Eder, Hans Liermann, Peter Schmidt, Reinhard Sprenger
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Abstract
A method for producing helically wound filament elements, and filament elnts produced according to this method. The method is distinguished in that a thermal treatment of the incandescent wire at temperatures of over 1200.degree. C. takes place already before the winding of the incandescent wire, so that, after separation, the coil springs open and can easily be detached from the core wire.
Claims21
A method of making helically wound filament elements comprising the steps of:
- a) coupling a high temperature filament wire to a machine core, the machine core being rotatable and axially displaceable from a holder, the wire extending from a wire dispenser;
- b) rotating the machine core while axially displacing the machine core to wind the wire on the machine core;
- c) heating a section of the wire between the wire dispenser and the machine core as the wire is being wound on the rotating machine core;
- d) after winding one or more turns of wire on the machine core;
- cutting the wire between the wire dispenser and the machine core leaving a wound section of wire on the machine core;
- and
- e) axially withdrawing the machine core with respect to the wound section of wire, thereby mechanically separating the wound section of wire from the machine core.
A method for producing helically wound filament elements in which a winding wire (3) made from tungsten is wound onto a core (1) with a circular cross-section and thermally treated, and the core is extracted, characterized
- a) in that the winding wire (3) is first thermally treated before the wire is wound onto the core by a very high temperature convective heat source (4), as a result of which the wire is brought to a temperature between 1200 degrees Celsius and 1800 degrees Celsius to be in the vicinity of, but less than the recrystallization temperature of the tungsten material used, and
- b) in that the winding wire (3) is rapidly wound onto the core (1) immediately thereafter.
Dependencies are inferred from the claim text.