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    • 5. 发明专利
    • PRODUCTION OF DRAWN GLASS BULB
    • JPS60204633A
    • 1985-10-16
    • JP5974684
    • 1984-03-28
    • STANLEY ELECTRIC CO LTD
    • TAKEDA MASAICHI
    • C03B23/051C03B23/047C03B23/08C03B23/11
    • PURPOSE:To produce a drawn glass bulb with little unevenness in wall thickness, drawn dimension, etc., by inserting a round bar of amaterial slightly compatible with glass vertically into a glass tube having one closed end, and softening a given part under heating to form a drawn part. CONSTITUTION:A glass tube 25 after closing one end in the preceding step is fed by a feeding table 30, and a round bar 24 is vertically inserted thereinto. The sound bar 24 consists of a carbon based material slightly compatible with glass, and formed into a stepped shape having an insertion part with an outside diameter smaller than the inside diameter of the glass tube 25. The glass tube 25 and round bar 24 are pushed up and positioned by a positioning member 31, and a given position of the glass tube 25 is heated by a rotating burner 32. Thus, a molten and softened part is drawn by lowering automatically the round bar 24 by a dimension (l1) to form a drawn part (25B) along the round bar 24. The resultant drawn part (25B) is then annealed to remove the glass tube 25, and the drawn part (25B) is cut to give the aimed drawn glass bulb.