FR2641026A3 - - Google Patents

Abstract

Thermally and acoustically insulating glass, in particular for automobile side windows, made from two sheets of glass connected by a seal and having a different thickness.

Description

INSULATING GLASS FOR VEHICLES

  The present invention relates to an insulating glass pane for vehicles, in particular to a movable side pane for motor vehicles, consisting of two sheets of glass connected by a spacing lining which follows

the entire periphery of the glass.

  This spacer can be produced in various configurations and contain materials capable of absorbing moisture inside the spacing so as to avoid phenomena

  unwanted fogging.

  Insulating glass, hereinafter referred to as "double glazing", is widely used in the building industry, since it offers considerable advantages in terms of

  thermal and acoustic insulation.

  This type of glass can also be used on vehicles to fulfill the same thermal and acoustic insulation objectives, thus offering a

  greater comfort inside the vehicle.

  For obvious safety reasons, this type of glass is preferably used for windows

movable sides of automobiles.

  Application to automobiles is known in

the state of the art.

  German patent application no. 3517581 describes double glazing for automobiles comprising two sheets of glass in which the inner sheet has a surface greater than that of the outer sheet, in particular along its short sides and along the upper edge ce, in order to favor the sealing of the glass itself and its sliding the

along the slides.

  French patent application No. 2609946 describes double glazing which is particularly suitable for use in an automobile due to its aesthetics.

  and the ease with which it can be cleaned.

  One of the problems which has hitherto hampered the large-scale use of these panes lies in that, in order to obtain adequate insulating characteristics, both thermal and acoustic, the thickness and therefore the weight of the glass n were not compatible with weight reduction

total vehicles.

  Another problem was that these glasses had to comply with the safety regulations in force and it was necessary to use thicknesses of glass which, after the tempering process, had a resistance to breakage in accordance with safety regulations. This latter problem has been solved by using a glass having a sodium / aluminum composition in place of the usual normal glass having a sodium / calcium composition. These glasses have the characteristic of giving, although they are extremely thin, thanks to a chemical toughening process, a resistance to breakage which meets the safety regulations, thus making it possible to produce double glazing panes sufficiently light

for the automotive industry.

  However, the reduction in thickness responding to the weight reduction imperative, resulted in a

  less thermal and acoustic insulation.

  The object of the present invention is by

  Therefore eliminate the above problem.

  This goal is achieved by a special positioning of the glass sheets and more specifically by using two glass sheets

  with different thicknesses.

  In particular, it has been found that by placing the glass sheet having the greatest thickness towards the outside and the glass sheet having the smallest thickness towards the inside, the acoustic insulation is considerably improved and at the same time the

  comfort inside the vehicle.

  The thermal insulation capacity is advantageously obtained by depositing on one or two sheets of glass, thin reflective and anti-solar layers containing an oxide or a metal in order to control the flow of energy and consequently obtain good conditions of insulation in both summer and winter. In addition, the thin layers are themselves electrically conductive and capable of increasing the already sensitive effect thanks to the reduction of the energy exchange coefficient, allowing demisting of the

  window by applying a voltage differential.

  The object of the present invention also relates to an insulating glass pane for vehicles, in particular to a movable side pane for motor vehicles comprising two sheets of glass connected together and at the same time spaced apart by a lining which extends over the entire periphery of the glass, characterized in that the two glass sheets have different thicknesses and in that the outer glass sheet

  is thicker than the inner sheet.

  Other features and benefits of

  the invention will follow from the following description,

  given purely by way of example without limitation and with reference to the attached single figure which shows a sectional view of a side window for automobiles. In the figure, the outer glass sheet 1 is connected to the inner glass sheet 2 by means of a spacer 3 which also has the function of sealing the spacer 4 formed by the

two sheets.

  Appropriate locking and sliding systems not shown in the figure will ensure the movement which is generally done from top to bottom.

and vice versa.

  According to the present invention, the outer sheet 1 has a thickness greater than the sheet

interior 2.

  Of course, the effects of the present invention also extend to models which allow similar uses to be obtained by bringing into play

works the same inventive idea.

Claims (5)

  1. Insulating glass for vehicles, in particular a side window for automobiles, comprising two separate glass sheets which are connected and spaced apart by a lining extending over the entire periphery of the glass, characterized in that the sheets   glass are of different thickness.   2. Insulating glass for vehicles according to claim 1, characterized in that the outer glass sheet has a thickness greater than the inner glass sheet.   3. Insulating glass for vehicles according to claim 1 or 2, characterized in that the   glass sheets have a sodium / aluminum composition.   4. Insulating glass for vehicles according to one   any of the preceding claims, characterized   in that the glass sheets are chemically toughened. 5. Insulating glass for vehicles according to one   any of the preceding claims, characterized   in that on one or both sheets of glass are deposited thin layers to increase the degree   glass thermal insulation in summer and winter.