Static structures (e.g. – buildings) – Window or window sash – sill – mullion – or glazing
Reexamination Certificate
1999-09-14
2001-02-13
Redman, Jerry (Department: 3634)
Static structures (e.g., buildings)
Window or window sash, sill, mullion, or glazing
C052S204600, C052S204710
Reexamination Certificate
active
06185882
ABSTRACT:
BACKGROUND OF THE INVENTION
In the construction of bullet resistant window assemblies, a rectangular thick glass unit commonly includes multiple layers of glass and glass clad polycarbonate sheets, and the composition and thickness of the glass unit is selected according to the level of ballistic and bullet resistance desired. The glass unit is supported by various forms of surrounding frame systems which are commonly constructed from sections of aluminum extrusions attached to steel strips or by forming sheet steel into frame sections. Sometimes, the frame defines a chamber which is filled with concrete to provide a higher level of security. However, in the construction of a high security bullet resistant window assembly, it is desirable to have a relatively light weight and compact frame capable of the highest level or rating of bullet resistance, and also a frame which is neat and decorative in appearance and is easy to install along with the multiple layer glass unit. It is further desirable to provide a frame which may be economically constructed and which may be easily modified to accommodate glass units of different thicknesses and different sizes.
SUMMARY OF THE INVENTION
The present invention is directed to an improved bullet resistant window assembly which provides all of the desirable features mentioned above and which is especially adapted to provide a high level of resistance rating such as a NIJ Level 3 (National Institute of Justice). More specifically, the bullet resistant window assembly of the invention incorporates a frame system which provides a neat and clean exterior and interior appearance, is compact and relatively light weight, uses existing commercially available components and is easy to install within a wall opening.
In accordance with a preferred embodiment of the invention, a multiple layer bullet resistance glass unit is surrounded by a rectangular steel frame having a wide peripheral flange integrally connected to a narrow peripheral flange by a web. A set of spacer bars are welded to the narrow flange around the frame, and a set of extruded aluminum trim base strips extend around the frame and are secured by peripherally spaced screws to the spacer bars and the wide flange of the steel frame. The trim base strips capture a peripheral portion of the glass unit which is sealed to the base strips by glazing materials such as a silicone material and glazing tape. A set of steel reinforcing plates or strips are secured to the exterior and/or interior base plates by the peripherally spaced screws and overlap the steel frame and a peripheral portion of the glass unit. A set of extruded aluminum trim strips or channels are snap-fitted onto the base strips for enclosing the steel reinforcing strips and for providing the frame of the window unit with a clean, neat and decorative appearance.
Other features and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
REFERENCES:
patent: 2933779 (1960-04-01), Deloroche
patent: 3624238 (1971-11-01), McKenzie
patent: 3994243 (1976-11-01), Anders
patent: 4543755 (1985-10-01), Crandell
patent: 4625659 (1986-12-01), Saelzer
patent: 5950380 (1999-09-01), Pearson
Norshield Security Products 13070/NOR BuyLine 2716, Bullet, Attact & Blast Resistant Windows, p. 3, Montgomery Alabama.
Tubelite 1995, 22.24 401 Series Slope Wall, Vertical 22.2 401 Series Slope Wall, End Wall Transition.
Jacox Meckstroth & Jenkins
Redman Jerry
LandOfFree
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