Abstract: The planar multi-coil filament of a high-wattage halogen-cycle incandescent lamp is suspended within the envelope by a mount assembly having support rods that are fastened to the lead-in conductors, the ends of the filament and the insulating bridge members by mechanical means rather than metal-to-metal welds. The mechanical junctures are effected by providing a coiled portion on one of the components and then crimping or hot-clamping it around the inserted part of the other component. The expense and quality control problems encountered with tungsten-to-tungsten and molybdenum-to-tungsten welds in the prior art halogen-cycle lamps are thus eliminated. Lamp cost is further reduced by fabricating the envelope from a selected hard glass and, in the case of lamps having large planar filaments, distortion of the filament coiled sections is prevented by modifying the mount structure to provide a "floating bridge" action.

Abstract: The invention relates to halogen incandescent lamps for use in photoreproduction processes and with a simple and cheaper filament construction. In this construction the filament sections emitting light during operation form one assembly with the connection conductors interconnecting them and connection conductors of a large length have in one or more places helically wound turns which are shortcircuited by a support connected thereto.

Abstract: A high power tungsten-halogen lamp having a filament arrangement suspended between a pair of alumina bridge members which are supported by a pair of vertically disposed tungsten rods. To provide a ruggedized mount, the free ends of the vertical rods are retained in respective externally protruding cavities provided in the dome of the lamp envelope.

Abstract: An incandescent lamp such as a tungsten filament lamp in which the filament is a series of alternate active coil sections and inactive straight sections. The surrounding glass envelope is correspondingly drawn down around the straight sections to reduce the volume of the envelope and to provide mechanical support for the filament.

Abstract: An electric incandescent lamp comprising an axially extending filament in a tubular vitreous envelope has improved filament supports of wire whose outer turns are formed as hexagonal loops comprising straight segments with angles between successive segments. The sharp bends at the angles decrease the springback and unwinding of the support when it is released from the mandrel, so that variations in support loop diameter with wire tension and size are reduced. The support may be fabricated through a new method and apparatus on a forming mandrel by engaging a wire in a slot in an exposed end face simulating a shallow helicoid. As the mandrel revolves, at least one full turn is wound around its periphery (which may be hexagonal) to form the outer envelope-engaging loop. The wire is then bent radially inwards at the shoulder of the projecting portion of the helicoid face to wind filament-engaging turns around the filament and wire mandrel which extend through an axially aligned aperture in the forming mandrel.

Abstract: The invention relates to an electric incandescent lamp having a tubular envelope in which a coiled-coil filament is stretched which is supported in at least one place between the ends by a support formed from wire, of which support a part bears on the inner wall of the envelope and another part supports the filament, The part which supports the filament has a helical shape and, according to the invention, is present inside the secondary winding of the filament. The said part comprises at least two turns the winding sense of which corresponds to that of the secondary turns of the filament.