Device and method for thermally pre-stressing elongated...

Details Device and method for thermally pre-stressing elongated... Device and method for thermally pre-stressing elongated...

2005-07-21

2010-10-05

Tucker, Philip C (Department: 1791)

Glass manufacturing

Processes

Glass preform treating

C065S115000

Reexamination Certificate

active

07805962

ABSTRACT:
A device and a method for thermal pre-stressing lengthy hollow objects, in particular glass tubes, are disclosed. The device comprises a heating device, a fixture for receiving an object, and a coolant feed device comprising an outer coolant feed unit with a plurality of nozzles for feeding coolant against an outer surface of the object, and further comprising an inner coolant feed device for feeding coolant against an inner surface of the object.

REFERENCES:
patent: 2375944 (1945-05-01), Quentin
patent: 4773926 (1988-09-01), Letemps et al.
patent: 645 699 (1937-06-01), None
patent: 800.531 (1936-07-01), None
patent: 512976 (1939-09-01), None

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