Laminated aircraft windshield
First Claim
1. A transparent laminated window having high impact resistance adapted for mounting on a support structure, said window comprising an outer protective sheet or ply of an abrasion resistant, chemical resistant and thermal resistant material selected from the group consisting of glass and plastic and a sublaminate comprising a plurality of thin, transparent, structural sheet members of polycarbonate resin each having a maximum thickness of 0.250 inch, elastomeric resinous interlayer material selected from the group consisting of polyurethanes and silicones which exhibit good tensile strength retention and embrittlement resistance over a wide range of temperatures disposed between and bonded to said structural sheet members, said structural sheet members and said elastomeric resinous interlayer material extending beyond the edge of said outer protective sheet to form edge portions integral therewith for mounting of the window to said support structure, said structural sheet members and said interlayer material having aligned spaced apertures in said edge portions and adapted for alignment with spaced apertures on said support structure for said window for receipt of edge attachment means applied only through said apertures when aligned to rigidly secure said edge portions to said support structure for said window such that loads imposed on said window are transferred from said window to said support structure through said structural sheet members and said edge attachment means, and interlayer material selected from said group bonding said outer protective sheet or ply to said sublaminate.
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Accused Products
Abstract
Disclosed are laminated windshields, preferably having an outer protective sheet of glass or plastic, at least two relatively thin structural sheet members of polycarbonate resin and interlayers of elastomeric resin interposed between and adhering said sheet and sheet members together. The thickness and material composition of the structural sheet members and interlayers are selectively correlated so that they function as an efficient energy absorber over a wide range of temperatures, such that forces emanating from a predesigned or preestablished impact on the outer sheet member are dissipated without penetration of the windshields.
85 Citations
36 Claims
- 1. A transparent laminated window having high impact resistance adapted for mounting on a support structure, said window comprising an outer protective sheet or ply of an abrasion resistant, chemical resistant and thermal resistant material selected from the group consisting of glass and plastic and a sublaminate comprising a plurality of thin, transparent, structural sheet members of polycarbonate resin each having a maximum thickness of 0.250 inch, elastomeric resinous interlayer material selected from the group consisting of polyurethanes and silicones which exhibit good tensile strength retention and embrittlement resistance over a wide range of temperatures disposed between and bonded to said structural sheet members, said structural sheet members and said elastomeric resinous interlayer material extending beyond the edge of said outer protective sheet to form edge portions integral therewith for mounting of the window to said support structure, said structural sheet members and said interlayer material having aligned spaced apertures in said edge portions and adapted for alignment with spaced apertures on said support structure for said window for receipt of edge attachment means applied only through said apertures when aligned to rigidly secure said edge portions to said support structure for said window such that loads imposed on said window are transferred from said window to said support structure through said structural sheet members and said edge attachment means, and interlayer material selected from said group bonding said outer protective sheet or ply to said sublaminate.
- 15. A transparent laminated window having high impact resistance adapted for mounting on a support structure, said window comprising an outer protective sheet or ply of an abrasion resistant, chemical resistant and thermal resistant material selected from the group consisting of glass and plastic, a first interlayer of elastomeric resin selected from the group consisting of polyurethanes and silicones which exhibit good tensile strength retention and embrittlement resistance over a wide range of temperatures adhered to said outer protective sheet, a pair of thin, transparent, structural sheet members of polycarbonate resin each having a maximum thickness of 0.250 inch, a second interlayer of elastomeric resin selected from said group disposed between and bonded to said structural sheet members, said first interlayer of elastomeric resin being adhered to one of said structural sheet members, and said first interlayer and said second interlayer of elastomeric resin having a thickness greater than 0.015 inch, whereby the propagation of cracks caused by impact on said outer protective sheet is minimized, said structural sheet members and said second interlayer of elastomeric resin extending continuously beyond the edge of said outer protective sheet to provide aligned edge portions integral therewith for mounting of the window to said support structure, said structural sheet members and said interlayer material having aligned spaced apertures in their edge portions and adapted for alignment with spaced apertures on said support structure for said window for receipt of edge attachment means applied only through said apertures when aligned to rigidly secure said edge portions of said structural sheet members and said interlayers to said support structure for said window such that loads imposed on said structural sheet members are transferred from said structural sheet members to said support structure through said edge attachment means.
Specification