Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1994-11-14
1998-05-05
Weisberger, Richard
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428412, 4284244, 428911, 109 10, 109 495, 109 80, B32B 712, E04B 202
Patent
active
057471592
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a bullet-resistant transparent panel, and also to a method and presses for making such a panel.
Many types of bullet-resistant transparent panels are known. One type, as described for example in U.S. Pat. No. 4,594,290, includes transparent sheets of acrylic and polycarbonate resins bonded together by a transparent polyurethane adhesive. The invention of the present application is directed particularly to the latter type of bullet-resistant transparent panel.
OBJECTS AND BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a transparent panel, particularly of the type described in U.S. Pat. No. 4,594,290, exhibiting unidirectional bullet-resisting characteristics; that is, the panel blocks the penetration of a bullet when fired from the outer side of the panel, but not when fired from the inner side of the panel.
Another object of the invention is to provide a method of making transparent panels, and a further object is to provide a press particularly useful for making such transparent panels.
According to the present invention, there is provided a transparent panel effective to block the penetration of a bullet when fired from the outer side of the panel but not when fired from the inner side of the panel, the transparent panel comprising: an outer transparent sheet of an acrylic resin having a thickness of 7.5-9 mm, and an inner transparent sheet of a polycarbonate resin having a thickness of 9.5-11 mm, the sheets being bonded together by a polyurethane transparent adhesive.
It has been surprisingly found, as will be shown more particularly below, that when the acrylic and polycarbonate sheets are of the above thicknesses, the laminated panel exhibits unidirectional bullet-resisting characteristics. Such a panel construction thus provides protection against outsiders attacking persons inside an enclosure, such as a vehicle, a protective teller's cage, or the like; but at the same time the panel permits insiders to fire against the attacking outsiders.
Best results were obtained when the outer acrylic resin sheet has a thickness of about 8 mm, the inner polycarbonate resin sheet has a thickness of about 10 mm, and the transparent polyurethane adhesive has a thickness of about 2 mm. Such a panel was found to exhibit the above-described unidirectional bullet-resisting characteristics with respect to bullets shot from an Uzi 9 mm full metal jacket (FMG), as will be described more particularly below.
In order to provide the panel with such unidirectional bullet-resisting characteristics with respect to the more powerful M-14, M-16 and AK-47 bullets, the panel may include a plurality of glass sheets bonded to each other and to the outer acrylic sheet. Preferably, the plurality of glass sheets include an outer glass sheet of 9-14 mm thickness, an intermediate glass sheet of 9-14 mm thickness, and an inner glass sheet of 3-6 mm thickness bonded to the outer face of the acrylic sheet.
As will be described more particularly below, a transparent panel including the polycarbonate and acrylic resin sheets described above, together with an outer glass sheet of 10 mm thickness, an intermediate glass sheet of 10 mm thickness, and an inner glass sheet of 4 mm thickness bonded to the outer face of the acrylic sheet, exhibits the above-described unidirectional bullet-resisting characteristics with respect to M-16 and AK-47 bullets; whereas a panel as described above but including an outer glass sheet of 10 mm thickness, an intermediate glass sheet of 10 mm thickness, and an inner glass sheet of 4 mm thickness exhibits the above-described unidirectional bullet-resisting characteristics with respect to the more powerful M-14 bullet.
According to another aspect of the present invention, there is provided a method of making a transparent panel, comprising forming a sheet of an acrylic resin and a sheet of a polycarbonate resin of the same size and configuration; applying a sealing strip around the peripheral edge of one of the
REFERENCES:
patent: 5229204 (1993-07-01), Labock
M.R.M. International, Inc.
Weisberger Richard
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