Sleeve for glass tube molding
AssigneeNippon Electric Glass Co., Ltd.
InventorKenichi Hoshiba
Life of this patent
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Abstract
Provided is a sleeve for glass tube molding capable of suppressing generation of foreign matter such as rust from a sleeve shaft and suppressing adhesion of foreign matter such as rust to the molten glass without degrading mechanical strength of the sleeve shaft. A sleeve for glass tube molding includes a sleeve shaft including a through-hole and a refractory cylindrical body inserted coaxially with the sleeve shaft around the sleeve shaft. A superior rust-resistant material having rust resistance superior to that of the sleeve shaft is provided to cover a part or whole of an inner surface of the through-hole of the sleeve shaft and to cover a tip of the sleeve shaft.
Claims4
A sleeve for glass tube molding comprising:
- a sleeve shaft including a through-hole;
- a refractory cylindrical body inserted coaxially with the sleeve shaft around the sleeve shaft;
- a pipe member including a superior rust-resistant material having rust resistance superior to that of the sleeve shaft, covering a part or whole of an inner surface of the through-hole of the sleeve shaft, and including a flange at one end covering a tip of the sleeve shaft;
- and
- a glass seal including a glass material, interposed between a tip surface of the sleeve shaft and the flange of the pipe member, directly contacting the tip surface and the flange, and further protruding outward than the flange in a radial direction of the flange.
Dependencies are inferred from the claim text.