Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1991-01-25
1994-01-04
Hastings, Karen M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65123, 65303, 65305, 264 11, 264163, C03B 1105, B29D 1100
Patent
active
052756378
ABSTRACT:
A method of pressing flowing-down molten glass from the opposite sides thereof by a pair of shaping mold members to thereby manufacture a glass optical part having surfaces corresponding to the shaping surfaces of the mold members is characterized in that a groove forming ring is provided around the shaping surface of at least one of the shaping mold members, a groove is formed in the molten glass by the groove forming ring during the press and the flowing-down molten glass is cut above that portion thereof which is being pressed, thereby obtaining a glass molded article having an ear protruding outwardly of the groove relative to an optical part body portion.
REFERENCES:
patent: 3306723 (1967-02-01), Forber
Kubo Hiroyuki
Nomura Takeshi
Sato Bunryo
Tanaka Hiroe
Yogo Nobukazu
Canon Kabushiki Kaisha
Hastings Karen M.
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