Electrostatic discharge noise suppression by conduction between a stepped metal element and the pane retainer

Abstract

A laminated glazing includes a first and a second glass sheet that are bonded by a first interlayer adhesive layer, a peripheral zone of the laminated glazing being covered by a stepped metal element, a window press that is rigidly connected to the structure for mounting the laminated glazing making contact with the laminated glazing, so as to hold the laminated glazing secure to its mounting structure, an electrical conductor linking the stepped metal element and the structure for mounting the laminated glazing by way of the window press.

Claims

1. A laminated glazing comprising at least a first glass sheet forming an exterior face of the glazing, which first glass sheet is linked to a second glass sheet by a first interlayer adhesive layer, wherein an edge of the first glass sheet is set back with respect to an edge of the second glass sheet, a peripheral portion of a free surface of the first glass sheet, the edge of the first glass sheet, an edge of the first interlayer adhesive layer and a portion of a surface of the second glass sheet extending beyond the first glass sheet describing a continuous stepped contour which is covered by a stepped metal element, a window press that is rigidly connected to a mounting structure for mounting the laminated glazing and a shape of which is substantially complementary to that of the continuous stepped contour making contact with the laminated glazing in a volume described by the continuous stepped contour, so as to hold the laminated glazing secure to the mounting structure, wherein said continuous stepped contour is covered by the stepped metal element with the interposition of an external seal, wherein the stepped metal element is covered by an air- and watertight seal, and wherein an electrical conductor links the stepped metal element and the structure for mounting the laminated glazing by way of the window press.

2. The laminated glazing as claimed in claim 1, wherein an electrical resistance between the stepped metal element and the structure for mounting the laminated glazing is at most equal to 30 M.

3. The laminated glazing as claimed in claim 1, further comprising at least a third glass sheet that is linked to the second glass sheet by a second interlayer adhesive layer.

4. The laminated glazing as claimed in claim 1, wherein the window press is bolted or screwed to the structure for mounting the laminated glazing.

5. The laminated glazing as claimed in claim 4, wherein the window press is formed integrally with the structure for mounting the laminated glazing.

6. The laminated glazing as claimed in claim 1, wherein a portion of the external seal is folded over the stepped metal element so as to afford the laminated glazing good durability and aerodynamic properties.

7. The laminated glazing as claimed in claim 1, wherein the electrical conductor is compressible and passes locally through the leak-tight seal.

8. The laminated glazing as claimed in claim 1, wherein the electrical conductor is positioned partly at the interface between the external seal and the leak-tight seal.

9. The laminated glazing as claimed in claim 6, wherein the electrical conductor passes locally through the folded-over portion of the external seal and extends while maintaining contact up to an exterior surface of the window press, including a screw or a bolt for attaching said window press to the structure for mounting the laminated glazing.

10. The laminated glazing as claimed in claim 1, wherein the first glass sheet is made of a mineral glass with a thickness of between 0.5 and 5 mm.

11. The laminated glazing as claimed in claim 1, wherein the second glass sheet and, if applicable, a third glass sheet and so on are made of a mineral glass with a thickness of between 5 and 10 mm, or made of a polymer material with a thickness of between 5 and 30 mm.

12. The laminated glazing as claimed in claim 1, wherein the interlayer adhesive layers are made of polyurethane (PU), polyvinyl butyral (PVB), ethylene/vinyl acetate (EVA) or equivalent, wherein a thickness of the first interlayer adhesive layer is between 3 and 10 mm.

13. A method comprising utilizing a laminated glazing as claimed in claim 1 as building, ground, air or water vehicle glazing, or glazing for street furniture.

14. The method as claimed in claim 13, wherein the laminated glazing is an aircraft cockpit glazing.

15. The laminated glazing as claimed in claim 10, wherein the thickness of the first glass sheet is between 2 and 4 mm.

16. The laminated glazing as claimed in claim 1, wherein the first glass sheet is made of a polymer material with a thickness of between 0.5 and 5 mm.

17. The laminated glazing as claimed in claim 16, wherein the polymer material is poly(methyl methacrylate) (PMMA).

18. The laminated glazing as claimed in claim 11, wherein the polymer material is poly(methyl methacrylate) (PMMA).

19. The laminated glazing as claimed in claim 11, wherein the thickness of the polymer is at most 20 mm.

20. The laminated glazing as claimed in claim 12, wherein the thickness of the first interlayer adhesive layer is between 4 and 8 mm.

21. The laminated glazing as claimed in claim 3, wherein a thickness of the second interlayer adhesive layer is between 0.5 and 4 mm.

22. The laminated glazing as claimed in claim 21, wherein the thickness of the second interlayer adhesive layer is at most equal to 2 mm.

Description

(1) The invention will be better understood in light of the following description of the appended drawings, in which:

(2) FIG. 1 is a schematic representation of a laminated glazing according to the invention in which the electrical conductor is compressible and passes locally through the leak-tight seal;

(3) FIG. 2 is a schematic representation of a laminated glazing according to the invention in which the electrical conductor is positioned partly at the interface between the external seal and the leak-tight seal

(4) FIG. 3 is a schematic representation of a laminated glazing according to the invention in which the electrical conductor passes locally through the folded-over portion of the external seal and extends while maintaining contact up to an exterior surface of the window press, including a screw or a bolt for attaching said window press to the structure for mounting the laminated glazing.

(5) In these examples, a glass sheet refers to a chemically tempered aluminosilicate glass sheet, marketed by Saint-Gobain Sully under the Solidion registered trademark.

(6) With reference to FIGS. 1, 2 and 3, a laminated glazing comprises a first glass sheet 1 forming an exterior face of the glazing, having a thickness of 3 mm, which is bonded to a second glass sheet 3 having a thickness of 8 mm by a first polyvinyl butyral (PVB) interlayer adhesive layer 2 having a thickness of 5.3 mm.

(7) A third glass sheet 5 having a thickness of 8 mm is bonded to the second 3 by a second polyvinyl butyral (PVB) interlayer adhesive layer 4 having a thickness of 2 mm.

(8) The edge of the first glass sheet 1 is set back with respect to that of the second 3, a peripheral portion of the free surface of the first glass sheet 1, the edge of this glass sheet 1, the edge of the first interlayer adhesive layer 2 and a portion of the surface of the second glass sheet 3 extending beyond the first glass sheet 1 describing a continuous stepped contour which is covered by a stepped metal element 7 made of aluminum.

(9) Said continuous stepped contour is covered by the stepped metal element 7 with the interposition of an external seal 6 made of polysulfide, a portion of which is folded over the stepped metal element 7 so as to afford the laminated glazing good durability and aerodynamic properties.

(10) The stepped metal element 7 is covered by an air- and watertight seal 8 made of silicone.

(11) The laminated glazing shown in FIGS. 1, 2 and 3 may be installed from the outside via a structure for mounting the laminated glazing, by bolting to the mounting structure a window press 31 covering the laminated glazing; this bolting may or may not result in the laminated glazing being pinched, the laminated glazing may also be bonded to the window press 31, and in any case held durably secure to the mounting structure. The window press 31 is a trim added from the outside.

(12) Mounting from the inside is also possible. In this case, the shape of the window press mentioned above is present but forms an integral part of the mounting structure, and a trim (window press) is added from the inside. Bolting the inside window press and bonding the laminated glazing may be combined, with or without the laminated glazing being pinched.

(13) With reference to FIG. 1, a compressible electrical conductor 21 electrically links the zed 7 and an interior surface of the window press 31 through a reserve produced in the leak-tight seal 8. The electrical conductor 21 is made of foam filled with conductive elements.

(14) In FIG. 2, an electrical conductor 21 consisting of an aluminium or stainless steel profile electrically links the zed 7 and a frontal surface of the window press 31, passing in particular through the interface between the external seal 6 and the leak-tight seal 8.

(15) In FIG. 3, the electrical conductor 21 passes locally through the folded-over portion of the external seal 6 and extends while maintaining contact up to an exterior surface of the window press 31.

(16) For each of the laminated glazings represented schematically in FIGS. 1 to 3, the electrical conductor 21 may, at each of its two ends, be brazed, screwed, crimped, glued or pinched according to the configuration of the electrical link.

(17) No unwanted discharging of the zed, nor any disruptive noise signaling this discharge, are observed in the glazings according to the invention.