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Publication numberUS3387551 A
Publication typeGrant
Publication dateJun 11, 1968
Filing dateJul 22, 1966
Priority dateJul 22, 1966
Publication numberUS 3387551 A, US 3387551A, US-A-3387551, US3387551 A, US3387551A
InventorsHughes David E
Original AssigneePittsburgh Plate Glass Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Air curtain for observation window
US 3387551 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

June 11, 1968 o. E. HUGHES 3,337,551

AIR CURTAIN FOR OBSERVATION WINDOW Filed July 22, 1966 2 mvzm'on 0A W0 5. HUG/1'55 BY @QMH 5%! ATTORNEYS United States Patent 3,387,551 AER CURTAEN FOR OBSERVATION WTNDOW David E. Hughes, La Vale, Md., assignor to Pittsburgh Plate Glass Company, Pittsburgh, Pa., a corporation of Pennsylvania Filed Juiy 22, 1966, Ser. No. 567,144 2 Claims. (Cl. 98-88) ABSTRACT OF THE DTSCLOSURE A window arrangement for a wall of a glass manufacturing apparatus is constructed so as to use a gas curtain to isolate the window from the atmosphere in the apparatus.

This invention relates to the manufacture of glass and especially to a viewing window construction for attachment to the wall of a glass manufacturing apparatus.

In the float process of manufacturing flat glass wherein glass is supported on a molten metal bath, the processing takes place under controlled conditions and in a closed space. To observe the process, viewing windows are provided in the walls of the float tank, -i.e., that tank which contains the molten bath.

The atmosphere Within such a tank is controlled and may contain constituents which will condense or be deposited on the inner face of a glass Window, rendering the window opaque and unusable within a short period of time. Replacement of the windows is thus frequently required, so as to observe the process, either by an operator or by a camera.

It has been proposed to provide a window structure in which a curtain of gas is moved across the interior of a box incorporating a window, as one side, in order to avoid the problems heretofore encountered and to isolate the window from the atmosphere within the tank.

The present invention is an improved construction of such a Window, as will be evident from the foregoing description taken with the accompanying drawing, in which FIG. 1 is a perspective view of a window arrangement constructed in accordance With this invention, and

FIG. 2 is a cross-sectional View of the apparatus of FIG. 1, taken on line 2-2 thereof.

In the drawing, the apparatus of this invention includes a rectangular frame having one end attached to the wall 12 of a float tank by any suitable means and in alignment with an opening 16 in the Wall 12. The opening 16 is, of course, above the float bath in the tank.

A frame box 18 is connected, as by welding, to the frame 10 and its outer end is sealed by a window 20- of glass. Generally, it is preferred to use tempered or wire glass for the window 20.

In the top 22 of the box frame 18, there is provided an elongated, relatively narrow slot 24 which extends from side wall to side wall of the frame 18 and a tapered manifold 26 is connected in registry with the slot, which manifold is connected to a source of controlled atmosphere, generally the same atmosphere supplied to the interior of the float tank. The tapered manifold 26 and the width of the slot 24 insure an even flow of atmosphere from top to bottom of the apparatus and across the window 2i).

To exhaust the supplied atmosphere there is provided an elongated relatively narrow slot 28 in the bottom wall 30 of the frame 18 opposite the intake slot 24. Usually the slot 28 is wider than the slot 24 to insure flow of atmosphere which may expand while in the frame 18 due to the temperature therein. A V-tapered manifold 32 is connected to the wall 30 in registry with the slot 28 to exhaust the amosphere from the frame 18. A discharge pipe 34 is connected to the manifold 32 and, in turn, is connected to a venturi device 36 connected in a supply line 38 of controlled atmosphere. The venturi device 36 insures a reduced pressure at the slot 28 and the flow of atmopshere across the window 20-. The atmosphere for the window can be, especially for economy reasons, recirculated. The pressure of the atmosphere supplied and withdrawn must be such to insure fiow across the window and not how into the float tank or from the float tank.

The device described can also be used in other equipment, such as glass melting tanks, or Where similar conditions are encountered. Also, other means, such as suction pumps, etc., can be used for exhausting the atmosphere from the frame 18.

I claim:

1. A window arrangement for connection to a wall of glass manufacturing apparatus having at least one openin g therein which comprises a frame fitted in registry with said opening, a glass window sealing the outer end of the frame, a slot in the top of the frame extending from side to side thereof, means connected to said slot for supplying a gas thereto and thus to said frame, a slot in the bottom of said frame extending from side to side thereof, means including a venturi-device connected to said second-named slot for withdrawing said gas, said slots directing gas supplied to said frame as a curtain across said window to isolate said window from the atmosphere in said glass manufacturing apparatus.

2. Apparatus as recited in claim. 1, further including a tapered manifold to insure uniform flow of gas to said first-named slot.

References (Iited UNITED STATES PATENTS 2,977,636 4/1961 Stout 98-436 X 2,896,854 7/1959 Noble et a1 9836 X 3,282,193 11/1966 Jennings 9836 ROBERT A; OLEARY, Primary Examiner.

W. E. WAYNER, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2896854 *Jul 10, 1956Jul 28, 1959Electric Eye Equipment CompanyProtecting device for window of optical housing
US2977635 *May 9, 1958Apr 4, 1961Edith E MillerProcess for tinting art objects
US3282193 *Apr 16, 1964Nov 1, 1966Minikay LtdAir curtains
Referenced by
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US3625133 *Aug 22, 1969Dec 7, 1971Sanko Air PlantAir-curtaining apparatus for forming an internal-isolated zone
US4303435 *Dec 1, 1980Dec 1, 1981Ppg Industries, Inc.Glass ribbon float tank with a pyrometer assembly having a heated viewing tube and method of use
US4449995 *Jul 22, 1982May 22, 1984Ppg Industries, Inc.Hinged window closure for float glass processing chamber
US4700615 *Jan 3, 1986Oct 20, 1987Protectaire Systems Co.Spray booth
US4779970 *Feb 9, 1987Oct 25, 1988Adolph Coors CompanyMoisture control system
US5042456 *May 30, 1990Aug 27, 1991Cameron CoteAir canopy ventilation system
US5232401 *Apr 20, 1992Aug 3, 1993Kawasaki Steel CorporationAir supplying apparatus
US5251608 *Jul 22, 1991Oct 12, 1993Cameron CoteAir canopy ventilation system
US5306209 *May 4, 1992Apr 26, 1994Lang Fred DContaminant shield for viewing ports
US5437702 *Aug 24, 1993Aug 1, 1995Coors Brewing CompanyHot bottle inspection apparatus and method
US5734467 *Jul 31, 1995Mar 31, 1998Coors Brewing CompanyInspection apparatus for high temperature environments
US5935285 *Dec 30, 1997Aug 10, 1999Coors Brewing CompanyMethod for inspecting manufactured articles
US6025910 *Sep 12, 1995Feb 15, 2000Coors Brewing CompanyObject inspection method utilizing a corrected image to find unknown characteristic
US6025919 *Aug 16, 1996Feb 15, 2000Coors Brewing CompanyMethod for measurement of light transmittance
US6049379 *Dec 30, 1997Apr 11, 2000Coors Brewing CompanyMethod for inspecting translucent objects using imaging techniques
US6089108 *Aug 20, 1997Jul 18, 2000Coors Brewing CompanyHot bottle inspection apparatus and method
US6118526 *Jul 23, 1997Sep 12, 2000Coors Brewing CompanyMethod for measurement of light transmittance
US6212962 *Feb 23, 2000Apr 10, 2001Coors Brewing CompanyHot bottle inspection apparatus and method
US6425346Mar 1, 2000Jul 30, 2002Delaval Holding AbProtecting device for a teat localizer
US20080003939 *Jun 8, 2006Jan 3, 2008Ralph Prideaux NaishAir exchange control apparatus and system
US20080285132 *Apr 1, 2008Nov 20, 2008O'kane Kevin JamesElement deflector for lenses, and/or method of making the same
WO2000051417A1 *Mar 1, 2000Sep 8, 2000Delaval Holding AbA protecting device for a teat localizer
U.S. Classification359/509, 65/158, 65/182.1, 74/566, 65/339, 239/105, 454/188, 65/32.2
International ClassificationE06B7/28, E06B7/00, C03B5/42, C03B5/00, C03B18/00, C03B18/16
Cooperative ClassificationE06B7/28, C03B18/16, C03B5/42
European ClassificationE06B7/28, C03B18/16, C03B5/42