Heating – Work chamber having heating means – Tortuous – branched or baffled heating flue means within or...
Reexamination Certificate
1999-11-23
2001-03-13
Wilson, Gregory (Department: 3749)
Heating
Work chamber having heating means
Tortuous, branched or baffled heating flue means within or...
C445S045000, C445S066000
Reexamination Certificate
active
06200132
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to ovens for the heat treatment of glass articles and, more specifically, to tunnel type ovens for continuous treatment of cathode ray tubes at the same time as gases contained within the tube are evacuated, commonly referred to as “exhaust ovens”.
2. Description of the Related Art
One example of an exhaust oven for this purpose is described in U.S. Pat. No. 4,752,268.
The heating and cooling of the shaped glass envelope forming the tube to minimise stresses therein and its evacuation which subjects the walls to substantial external pressure is a critical operation. The demand for larger and flatter cathode ray tubes, particularly for domestic high definition “flat screen” television receivers, has increased the processing problems and the need for ovens giving economical production and minimum damage or wastage of these high value components.
The object of the invention is to provide an exhaust oven for cathode ray tubes which is particularly effective and reliable in operation to provide economical and consistent production.
SUMMARY OF THE INVENTION
An exhaust oven for heat treating and simultaneously evacuating cathode ray tubes includes a tunnel structure with a through passageway and temperature control apparatus for providing regulated heating and/or cooling of the atmosphere in one or more longitudinal zones of the passageway. The oven also includes apparatus for conveying the tubes along the passageway and exhaust ducts operatively connected to the necks of the tubes during conveyance to evacuate gases therefrom. Baffles within at least one of the longitudinal zones of the passageway circulate the atmosphere about the exterior of the tubes. The baffles include at least one inlet directing a flow of atmosphere to impinge onto the face of the screen panel of each tube and one or more outlets in adjacent spaced relationship to side edges of said panel and/or to the neck of the tube for exit of the flow of atmosphere from the baffles.
According to one aspect of the invention there is provided an exhaust oven for heat treating and simultaneously evacuating cathode ray tubes as defined by claim
1
of the appended claims.
According to another aspect the invention comprises a cathode ray tube as defined by claim
10
hereof.
REFERENCES:
patent: 3884667 (1975-05-01), Schraven
patent: 4028052 (1977-06-01), Verhoeven et al.
patent: 4752268 (1988-06-01), Kataoka et al.
patent: 4979919 (1990-12-01), Toyama
patent: 5201682 (1993-04-01), Nakagawa et al.
patent: 5588830 (1996-12-01), Josefsson et al.
patent: 0 287 452 B1 (1991-03-01), None
patent: 0 060 586 (1982-09-01), None
Brinks Hofer Gilson & Lione
Stein Atkinson Stordy Limited
Wilson Gregory
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