Abstract:
An arrangement for attaching a safety glazing element for a building, including a supporting element connected to the building, and a glazing element including a pane coated with a safety film adhering to an inner surface of the pane. The glazing element is attached by an adhesive strip to the support. A border on the periphery of the pane is free of film so that a peripheral limit of the film is situated at a distance from the edge of the pane, the distance separating the edge of the pane and the limit of the film being alternately variable.

Description:
BACKGROUND 
     The present invention relates to a glazing element comprising a safety film. It relates in particular to an arrangement for attaching a building glazing element, for example a shop window or a glazed façade. 
     The document WO9626336 describes a building glazing element having a pane of glass of which one surface is entirely lined with a safety film. The safety film enables an anti-intrusion or non-break glazing element to be obtained. In that document, the glazing element is attached to the building by way of a mount element to which the surface of the glazing element which is lined with the film is adhesively bonded. 
     However, adhesively bonding the glazing element by way of the safety film impairs the quality of attachment of the glazing element because the glass pane is not adhesively bonded directly to the mount. 
     The document WO2007042716 provides a glazing element having a glass pane lined with a safety film, the glass pane having a peripheral region not lined with the film and thus enabling it to be attached directly to a mount element connected to the building without thereby impairing its hold. 
     However, the safety film is not held on the mount element and its effectiveness is reduced. 
     BRIEF SUMMARY 
     The aim of the invention is to provide a glazing element comprising a glass pane with a safety film for attaching the glass pane to a mount element of the building and also attaching the periphery of the film without the attachment of the film impairing the quality of attachment of the glass pane to the mount element. 
     To this end, the invention provides an arrangement for attaching a safety glazing element in which a border at the periphery of the glass pane is free of film such that a peripheral limit of the film is located at a distance from the edge of the glass pane, the distance between the edge of the glass pane and the limit of the film varying alternately. 
     According to other features of the invention, first peripheral portions of the film may be in contact with a strip of adhesive and second peripheral portions of the film may be free with respect to the strip of adhesive. 
     The first and second peripheral portions of the film may be alternately adjacent. 
     The limit of the film may be undulating, in particular in waves whose peaks correspond to the portions of the limit closest to the edge of the glass pane in the first portions, and whose troughs correspond to the portions of the limit furthest away from the edge of the glass pane in the second portions, the profile of each peak being flatter than the profile of each trough. 
     The distance between the limit of the film and the edge of the glass pane may vary alternately following a sine wave, a sawtooth profile or following a notched profile. 
     The greatest width of the film covered by the strip of adhesive in the first portions may be approximately 1 millimeter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will now be described in examples with reference to the following drawings: 
         FIG. 1  is a schematic partial section view of a glazing element according to the invention fitted on a mount element, 
         FIG. 2  is a partial plan view of a glazing element according to the invention, and 
         FIG. 3  is a detail view of  FIG. 2  as indicated by the reference III in  FIG. 2 . 
     
    
    
     DETAILED DESCRIPTION 
     A building may have openings which need to be covered with a glazing element, such as for example shop windows. These glazing elements are liable to be subject to acts of vandalism such as objects being thrown at them and are thus provided with a safety film which, without constituting a screen, slows down illegal entry, prevents the glass pane being dislocated from its mount, or prevents pieces of glass being thrown out under the effect of the impact. 
     According to the invention, a glazing element  8  comprises a glass pane  14  of which one surface is lined with a safety film  20 . This safety film is a film of polyethylene terephthalate having a thickness of around 200 to 350 micrometers. This film  20  adheres to the glass pane  14  by way of an adhesive material. 
     This glazing element  8  is adhesively bonded to a mount element  10 . This mount  10 , for example a metal frame, is attached to the building and comprises a wall  12  which delimits an opening in this building. 
     The glazing element  8  fully or partially closes the opening. A peripheral portion  16  of the glass pane  14  covers the mount  10  over all or just part of the perimeter of the opening. Said portion  16  of the glass pane surrounds said opening such that it is opposite a region  17  of the mount extending at the periphery of the opening in a plane parallel to the glazing element  8 . 
     The film  20  applied to the glass pane  14  is present over the entire inner surface of the glass pane  14  opposite the opening, but also around this surface, in order to limit deterioration of the glass pane close to its edges. The expression “inner surface of the glass pane  14 ” is understood to mean the surface opposite the mount  10 . 
     In the example shown, a peripheral limit  22  of the film is located between the wall  12  of the mount defining the opening and the peripheral edge  18  of the glass pane such that a peripheral band  24  of the film extends between said peripheral portion  16  and said region  17 . The band  24  is located opposite the region  17  on an inner fraction  17 A of the region  17  next to the opening. The band  24  extends over an area of the glass pane covering an inner fraction  16 A of the peripheral portion  16  next to the surface of the glass pane opposite the opening. The inner fractions  16 A and  17 A extend between the level of the limit  22  and the level of the wall  12  of the mount defining the opening. 
     An outer fraction  16 B of the peripheral portion  16  is next to the peripheral edge  18  of the glass pane. The outer fraction  16 B forms a free border of film, i.e. a border  16 B of the glass pane not covered with the film. Apart from the border  16 B located between the peripheral edge of the glass pane and the peripheral limit of the film, the glass pane is covered by the film over its entire inner surface. 
     The outer fraction  16 B, or border  16 B, and the outer fraction  17 B thus extend between the level of the edge  18  and the level of the limit  22 . 
     A strip of adhesive  30 , also called an adhesive seal, is located between the region  17  and the portion  16  of the glass pane  14  for attaching the glazing element to the mount element  10 . 
     The strip of adhesive  30  has an inner edge  30 A by the film and an outer edge  30 B by the peripheral edge  18  of the glass pane. The strip of adhesive  30  has a mid axis  30 C. 
     The strip of adhesive  30  is also used to adhesively bond the film  20  in order to preserve the cohesion of the assembly formed by the glass pane and the film. 
     According to the invention, the peripheral limit  22  of the film is not rectilinear or approximately rectilinear. 
     In the exemplary embodiment shown, the limit  22  is undulating so as to form a mid line  22 A ( FIG. 3 ) approximately parallel to the edge of the glass pane along the greater part of the perimeter of the glass pane. The amplitude of the undulations is in this case around 5 millimeters. 
     In an embodiment which is not shown, the limit  22  is cut approximately following a sine wave having an amplitude of 4 millimeters. The amplitude of the sine wave depends on the width of the peripheral enameling of the glazing element, the enameling usually being intended to make the adhesive invisible from the outside. 
     In the embodiment shown, the limit  22  is cut following a profile forming waves. The peak of each wave, which corresponds to the portions of the limit  22  closest to the edge of the glass pane, has a flatter profile than the profile of the trough of each wave, which corresponds to the portions of the limit  22  furthest away from the edge of the glass pane. 
     According to the invention, the strip of adhesive  30  covers the wave peak and does not cover the wave trough. Each trough is thus free of adhesive bonding with respect to the strip  30 . In the embodiment shown, the strip of adhesive  30  covers the peak of the waves for a distance of approximately 1 millimeter. In this case, the strip of adhesive  30  covers the peak of the waves for a distance of approximately one quarter of the wave amplitude and for a distance of less than one quarter of the width of the strip of adhesive. 
     The regions of the film not covered by the strip make it possible to avoid the presence of a region of incipient unsticking of the strip  30  from the glass pane, to the benefit of the quality of attachment of the glass pane  14  to the mount  10 . 
     Thus, advantageously, if the adhesive material is insufficient for the cohesion of the film and the glass pane in the event of an impact on the glass pane, the strip of adhesive  30  prevents the glass pane being broken by reinforcing the effect of the film at its peripheral limit without harming the effect of the strip of adhesive for attaching the glass pane to the mount  10 . 
     In a first phase of fitting the glazing element  8  to the mount  10  connected to the building, the strip of adhesive  30  is stuck on in a manner offset with respect to the mid line  22 A of the peripheral limit  22  and then the safety glazing element is assembled on the mount. 
     It should be noted that the mid axis  30 C of the strip of adhesive  30  is offset toward the outside, i.e. toward the peripheral edge  18  of the glass pane  14 , both with respect to the mid line  22 A and with respect to the peaks of the waves of the film. 
     The strip  30  is applied both over the outer fraction  16 B of the peripheral portion  16  of the glass pane  14  and over the film  20 , over the first peripheral portions of the film. 
     In a second fitting phase, the glass pane is then presented to the opening  12  and to the region  17  of the wall  10  and then the strip  30  is pressed against the outer fraction  17 B in order to attach the glass pane  14  to the wall  10 . 
     The strip  30 , compressed between the glass pane  14  and the mount  10 , adheres to a portion of the peripheral limit of the film. 
     Typically, the strip of adhesive  30  is around 6 to 10 millimeters wide. 
     In the embodiment shown, the non-rectilinear cut of the limit of the film is continuous, i.e. has no sharp corners, but as an alternative, the limit of the film follows a sawtooth profile, i.e. with triangular cuts which form peaks and troughs. As an alternative, the limit of the film follows a notched profile forming peaks and troughs. 
     In an alternative embodiment, all of the peaks do not connect with the adhesive, so that the second portions comprise a series of peaks and troughs.