LAMP FILAMENT SUPPORT CONSTRUCTION

摘要

A method of constructing a filament support member from a single-piece preformed refractory metal wire (12) having at least one loop protrusion (20) formed in the wire and positioned between the ends of the wire. A section of glass tubing (22) is positioned over and supported by the loop protrusion (20) with a head portion (19) of the loop extending beyond the section of tubing (22). Heat (21) is applied to melt the section of tubing to form an insulating bead (23) at the base of said loop protrusion (20). The head portion (19) of the loop protrusion is then trimmed to interrupt electrical continuity in the wire (12) and thus electrically isolate the respective ends of the wire (14,16).