Abstract: A method for manufacturing a high ductility and high hot tensile strength tungsten wire for incandescent lamp filaments is disclosed. The method comprises the steps of preparing a tungsten alloy, swaging a tungsten rod from the alloy, and drawing the swaged rod to wire size in multiple drawing passes. In the method, the wire is annealed between predetermined draws. It is proposed that an annealing is performed before the final drawing pass, by annealing the wire at a temperature between 1100-1300° C. There is also provided a tungsten wire for incandescent lamp filament, which has high ductility and high hot tensile strength. The tungsten wire of the invention has a cold tensile strength-hot tensile strength ratio not exceeding 3.5.

Abstract: A method for manufacturing a high ductility and high hot tensile strength tungsten wire for incandescent lamp filaments is disclosed. The method comprises the steps of preparing a tungsten alloy, swaging a tungsten rod from the alloy, and drawing the swaged rod to wire size in multiple drawing passes. In the method, the wire is annealed between predetermined draws. It is proposed that an annealing is performed before the final drawing pass, by annealing the wire at a temperature between 1100-1300° C. There is also provided a tungsten wire for incandescent lamp filament, which has high ductility and high hot tensile strength. The tungsten wire of the invention has a cold tensile strength—hot tensile strength ratio not exceeding 3.5.

Abstract: A tungsten-rhenium filament for an operation temperature between 2900 and 3200° K is disclosed. The filament comprises an aluminum-potassium-silicon (AKS) additive. The filament has a grain microstructure comprising substantially exclusively elongated interlocking grains with a Grain Aspect Ratio (GAR) not less than 12. The rhenium content of the filament is between 0.2-0.4% by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared with a rhenium content of 0.2-0.4% by weight. The alloy powder is pressed and presintered, and thereafter sintered with direct current. A rhenium-tungsten filament is formed, which has a metastable crystal structure. The filament is annealed below the recrystallisation temperature, and recrystallised above the crystallization temperature. There is also provided a halogen incandescent lamp with a glass envelope enclosing a tungsten-rhenium filament.

Abstract: A tungsten-rhenium filament is disclosed. The filament has a re-crystallization temperature above 2000° C., and it comprises an aluminum-potassium-silicon (AKS) additive. The potassium content of the filament is between 80-110 ppm, and the rhenium content is between 0.05-0.19% by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared with a rhenium content of 0.05-0.19% by weight, and a potassium content between 80-110 ppm. The alloy powder is pressed and presintered, and thereafter sintered with direct current. A rhenium-tungsten filament is formed which has a metastable crystal structure. The filament is wound on a mandrel, and it is annealed on the mandrel below the re-crystallization temperature. The filament is finally re-crystallized above the re-crystallization temperature. A halogen incandescent lamp with an envelope enclosing a tungsten-rhenium filament is also provided.

Abstract: A tungsten-rhenium filament is disclosed. The filament has a re-crystallization temperature above 2000 ° C., and it comprises an aluminum-potassium-silicon (AKS) additive. The potassium content of the filament is between 80-110 ppm, and the rhenium content is between 0.05-0.19 % by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared with a rhenium content of 0.05-0.19 % by weight, and a potassium content between 80-110 ppm. The alloy powder is pressed and presintered, and thereafter sintered with direct current. A rhenium-tungsten filament is formed which has a metastable crystal structure. The filament is wound on a mandrel, and it is annealed on the mandrel below the re-crystallization temperature. The filament is finally re-crystallized above the re-crystallization temperature. A halogen incandescent lamp with an envelope enclosing a tungsten-rhenium filament is also provided.

Abstract: A tungsten-rhenium filament for an operation temperature between 2900 and 3200° K is disclosed. The filament comprises an aluminum-potassium-silicon (AKS) additive. The filament has a grain microstructure comprising substantially exclusively elongated interlocking grains with a Grain Aspect Ratio (GAR) not less than 12. The rhenium content of the filament is between 0,2-0,4% by weight. A method for manufacturing a rhenium-tungsten filament is also disclosed. The method comprises the following steps. An AKS doped tungsten-rhenium alloy powder is prepared with a rhenium content of 0,2-0,4% by weight. The alloy powder is pressed and presintered, and thereafter sintered with direct current. A rhenium-tungsten filament is formed, which has a metastable crystal structure. The filament is annealed below the recrystallisation temperature, and recrystallised above the recrystallisation temperature. There is also provided a halogen incandescent lamp with a glass envelope enclosing a tungsten-rhenium filament.

Abstract: The invention relates to non-sag tungsten wire for being used in light sources or heating elements, which tungsten wire is prepared from a tungsten block by powder metallurgy process with thermomechanical technique, and has an overlapped crystal structure after recrystallization and contains a dopant material. The essential feature of the tungsten wire according to the invention is that as the dopant material, it contains at least one of the following additive materials: lanthanum/III/oxide, cerium dioxide.

Abstract: An inlead for an electric lamp formed of an alloy of tungsten and molybdenum. The inlead has a rate of thermal expansion or contraction approximating that of the glass forming the bulb. This minimizes the expansion/contraction mis-match stress between the two materials. In addition, the alloy composition functions to reduce oxidation and degradation of the lead.

Abstract: A handrail with or without a wedge for escalators and speedwalks involves a number of permanently connected molded layers wherein the lower outer layer of the handrail, in part, constitutes a slide layer and, in part, constitutes a conveyor layer, an inner layer having increased longitudinal strength constitutes a traction carrier, and the upper outer layer constitutes an uppermost elastic coating of said handrail, wherein said lower outer layer has at least two symmetrically arranged longitudinal grooves whose spacing is somewhat larger than the width of said inner layer having increased longitudinal strength. The tractor carrier of the handrail is always accurately centered so that it does not tend to lateral movement.

Abstract: In power saws of the kind comprising a cutter bar around which travels a motor-driven saw chain, a safety device arranged to ensure automatic release of a safety brake to stop the saw chain. The device comprises a two-arm lever which is pivotally mounted in the body of the saw in such a manner that one arm abuts against the cutter bar so as to transmit jerky movements of said bar to the opposite arm which cooperates with means on a pivotable plate to influence the braking means.