FR2650855A1 - PROCESS FOR THE SEALED FIXING OF DOUBLE GLAZING IN A CHASSIS, ESPECIALLY A WINDOW - Google Patents

Abstract

This method comprises the installation of the double glazing in the rebate of the frame arranged flat, characterized in that this installation constitutes the first operation of the method and is followed by the injection, in the space existing between the double glazing 2 and the bottom of rebate 11 of the frame 1, of a liquid mixture formed of at least two constituents giving rise to a polymerization reaction at room temperature.

Description

The subject of the present invention is a method of fixing

  waterproof double glazing in a carpentry frame.

  To date, the industrial installation of double glazing is traditionally carried out on the frame, generally made of wood, metal or plastic, placed on the production line, by applying a strip of mastic on the rebate of this frame. then install the double glazing, which is necessarily of dimensions slightly less than

that of said chassis.

  The glazing positioning operation is difficult to achieve with all the desired precision, and it is necessarily followed by the installation of shims of variable sizes that the operator selects and places on the sides of the frame in the necessary places, so as to make up for the play inevitably created by the installation and so that the double glazing

gives rigidity to the leaf.

  Once the glazing is placed on the frame, a second layer of this product is placed on its upper face and approximately opposite the first layer of mastic, on which the glazing bead is placed, and the assembly thus formed is then placed in a press which secures the various elements by crushing the putty. The glazing bead is then fixed to the chassis,

  generally by nailing or screwing.

  This method has drawbacks because it requires relatively long manufacturing times due to the successive operations which must be carried out manually, which results in significant labor costs. In addition, the glazed panel thus produced presents risks of leakage, in particular at the level of the lower assemblies, whence the need to complete the sealing with an additional deposit of mastic applied to the right of the assemblies, and to spare means water drainage, most often sloping drilling or rebate. The object of the present invention is to remedy these drawbacks by proposing a method of fixing double glazing which combines the advantage of technically superior results, in particular in terms of sealing, that of authorizing

  automation of the production line.

  The present invention thus relates to a method of fixing a double glazing which is essentially characterized in that it consists in casting or injecting between the rebate of the joinery and said double glazing a fluid liquid mixture formed of at least two constituents giving rise to a polymerization reaction at room temperature, leading to the formation of a seal which ensures both the sealing of the glazing and its

seat wedging.

  In accordance with the method according to the invention, the double glazing is firstly placed in the rebate of the frame arranged flat, and secondly the liquid composition is poured or injected, filling all the space available between the rebate and the glazing, and infiltrating

also under the latter.

  The glazing bead is then fixed either by conventional means or by gluing, after depositing a strip of mastic or glue-mastic at the periphery of the upper face of the glazing. The composition used in the process according to the invention to produce the leaktight seal between the glazing and the joinery can consist of any liquid mixture capable of giving rise to a polymerization reaction at room temperature, however it advantageously consists of mixture, produced at the time of use, of an isocyanate and a polyol, leading to the in situ formation of a polyurethane. According to a preferred embodiment of the method according to the invention, the mixture used is such that the crosslinking of the polyurethane takes place within a period of time of the order of

a few tens of seconds.

  For this purpose, the starting mixture can be that consisting of a polyol whose viscosity is from 9 to 10,000 mP / s at

  C and the density at the same temperature of 1.45 and a 4.4'-

  diphenylmethane diisocyanate of viscosity 180 to 200 mP / s and density 1.22 to 20 C, the weight ratio of the mixture being 100 parts of polyol per 25 parts of isocyanate. The mixture, injected in a few seconds, gives a joint whose physical characteristics at 20 C are as follows I

- gelation time: 12s.

  - setting time: 2 min 30 s to 3 min 30 s.

  - shear stress: 8 N / mm2.

- bonding value: 30 to 40 N / cm.

  In order to improve the joining of the glazing to the frame, it is possible to provide on the horizontal face of the rebate a groove extending the space existing between the end of the double glazing and the bottom of said rebate and intended to receive the liquid composition forming the joint. Other features and advantages of this

  invention will emerge from the following description of one of its

  embodiments illustrated by the appended drawing, being indeed

  understood that this description has no character

  limiting with respect to the invention.

  In the accompanying drawing: - Figure 1 shows a partial sectional view of a double glazing fixed according to the method of the invention to a frame

  window whose rebate has a groove.

  - Figure 2 shows a partial sectional view of a double glazing fixed, according to the method of the invention, to a frame

  window whose rebate has no groove.

  If we refer first to Figure 1, we see the frame 1 secured to the double glazing 2 by a polyurethane gasket 3 which fills the space between the rebate base 11 and said double glazing 2, as well as that formed by a groove 12 formed in the horizontal face of said rebate. The double glazing 2, formed by two panes 21 and 22 secured by a conventional seal 23 forming a spacer, carries at the periphery of its upper face a conventional seal 4 made of mastic, glue or glue-mastic, intended to secure it to the glazing bead 5 fixed to the bottom of the rebate 11 by conventional means not

  shown as screws or nails, or by gluing.

  If we then refer to Figure 2, we find the same elements as in Figure 1, except for groove 12: in this case, the mixture constituting the polyurethane seal 3 seeps between the base 25 of the double glazing 2 and the base of the rebate,

  connecting the double glazing 2 to the frame 1.

  It is clearly understood, on examination of these figures, the role played by the polyurethane seal 3, which provides a particularly effective connection between the double glazing 2 and the frame 1, and which gives the assembly a perfect seal, thanks at the continuity of said joint 3 between edge 24

and the base 25 of the double glazing 2.

  It should in particular be emphasized that any faulty assembly between the uprights and the lower cross member of the chassis is necessarily sealed during the pouring or injection of the liquid mixture constituting the seal, which

  explains the perfect tightness of the assembly thus produced.

  This total tightness of the assembly constitutes one of the main advantages of the method according to the invention, which makes it possible to obtain a dry rebate requiring neither drainage nor ventilation. To this advantage is added that constituted by the fact that the double glazing is sealed in the frame, which results in a significantly greater rigidity of the assembly compared to conventional assemblies, and a significantly improved resistance over time. Finally, if the frame is pressed, during the installation of the double glazing, on a flat surface, the leaf obtained has a remarkable flatness, clearly better than that of

conventional leaves.

  The process according to the invention combines with these notable advantages that of not requiring a pressing operation to

  securing the assembly formed by the frame, the glazing and the

  glazing beads, the latter also losing its technical utility to play only an aesthetic rattle. The method according to the invention thus makes it possible to install double glazing of significant thickness in usual rebates, since the glazing bead is no longer necessary to ensure the mechanical strength. of the whole and that a simple clothing with a dish or a rod of aluminum, polyvinyl chloride or rubber is enough to close the space existing between the glass sheet and the rebate.

Claims (3)

CLAIMS.   1) A method of tightly fitting a double glazing in a carpentry frame, in particular a window frame, comprising the laying of double glazing in the rebate of the frame arranged flat, characterized in that this laying constitutes the first operation of the process and is followed by the injection, in the space existing between the double glazing (2) and the rebate bottom (11) of the frame (1), of a liquid mixture formed of at least two constituents giving rise to a reaction of polymerization at ambient temperature.   2) Method according to claim 1 or claim 2, characterized in that the injected mixture consists of at least one polyol and at least one isocyanate each having a density less than 1.5 and polymerizing in a period of time of about a minute.   3) Method according to claim 1, characterized in that the rebate of the frame (1) has a groove (12) on its face arranged horizontally.