NO163110B - RAMMEKONSTRUKSJONSDEL. - Google Patents

Abstract

1. A frame component (1) with an inserted filling (4) for window or door frames composed of hollow-section members (1) connected to one another at the corners, having a rib (7), which is preferably disposed at the outside of the frame, and a plastics retaining strip (11), particularly of impact-resistant rigid PVC, which is inserted in the frame subsequently, preferably at the inside, to hold the filling (4), for example a pane of glass (4), wherein both the rib (7) and the retaining strip (11) each rest with a flexible seal (14, 15) against the filling (4), under prestressing, and wherein the seal (14) of the retaining strip (11) is coextruded with the latter, while the seal (15) of the rib (7) is inserted in a corresponding groove (8) and has a section of high flexibility which is substantially subjected to bending stress, characterised by the following features : the seal of the retaining strip (11) is constructed in the form of a support (14) for the retaining strip (11), which support is ribbed at its surface adjacent to the filling (4), is subjected substantially to compressive stress and has little flexibility ; the seal (15) pushed into the rib (7) is constructed in the form of a hollow-section flexible tube (15) ; the hollow-section flexible tube (15) consists of synthetic rubber with a high elastic flexibility, particularly of EPDM ; the sealing support (14) coextruded with the retaining strip (11) consists of the following materials : (a) 40 to 60 parts, particularly 50 parts, of chlorinated polyethylene with a chlorine content of 30 to 42%, particularly 36%, (b) 20 to 30 parts of polyvivyl chloride with a k-value of 58 to 78, preferably 70, and a plasticizer sorption of at least 30% (according to DIN 53417, part 1), and (c) 20 to 30 parts of nitrile rubber NBR with a ratio of butadiene to acrylonitrile of from 55 to 45 to 82 to 18, particularly 67 to 33.

Description

The invention relates to a frame part with inserted filling, in particular a window or door frame according to the preamble of patent claim 1. The window or door frame can be a blind frame or a sash frame. The frame can e.g. consist of light metal profile rods. It is preferably assembled from plastic hollow profile rods. The filling, usually one or more panes of glass, is held in place in the frame by means of two equally opposite gaskets. However, the filling can also be e.g. a plastic sheet.

One of the gaskets is held in a groove in a rib, while the other gasket sits on a fastening strip, which in turn is pushed into a groove in the hollow profile rod. As a rule, the hollow profile rod and the fastening strip are made of impact-resistant hard PVC.

Both gaskets are designed as lip gaskets with several lips, which run parallel to each other and which, through the insertion of the filling, are deformed so that they rest against its surface under tension. The material in these lips is thereby primarily stressed in bending.

Such sealing lips have a very large deformation range and are therefore also suitable for taking up relatively large dimensional deviations in the thickness of the filling and in the corresponding dimensions of the frame and the filling.

The gasket that sits in the rib is usually made of natural or synthetic rubber. Such a material remains elastic and, even after a long time, still exerts the necessary holding force on the filling.

This is different in the case of the gasket placed on the attachment strip; this consists of thermoplastic material when it is co-extruded together with the fastening strip. A co-extrusion of the frame bars' thermoplastic and a fastening strip of elastomers that are resistant in elasticity, as here

comes up, is not possible.

Thermoplastic substances, especially those containing plasticizers, tend after a long time to build up higher stresses caused by deformation, so that the known gasket, which was co-extruded together with the fastening strip, with its sealing lips after some time no longer rests against the filling with sufficient prestress. Consequently, not only is the sealing effect damaged, as such a loosely fitting sealing lip can break off due to moisture. The known packing is also no longer able to hold the filling, which often has to absorb considerable forces (e.g. wind forces), in its position.

An attempt has been made to prevent the lack of sealing by placing the fastening strip with the co-extruded thermoplastic gasket at external windows or doors on the inside of the frame. However, due to the flexibility of the thermoplastic sealing lips, which are loaded on bending, it was possible that the filling - e.g. by wind forces - was pushed further inwards, so that the outermost rubber seal also became leaky.

Based on this known technique, the purpose of the invention is to avoid, or at least reduce to a harmless level, the reduction of the packing's compressive force, or the loosening of the filling.

This purpose is achieved through the further development according to the characteristic features in patent claim 1.

By the fact that the fastening strip's gasket is no longer, as before, equipped with yielding sealing lips, which are only loaded on bending and are thereby highly stressed, but according to the invention have a steep spring characteristic, while the opposite gasket is a hollow profile hose with high compressibility and a flat spring characteristic, the fastening strip's gasket only slightly deformed. The resulting voltages are low and are therefore only reduced to a small extent. Correspondingly, the remaining part of the deformation is also small and the reduction in the compressive force stays in an area in which it can easily be taken up by the overlying continuous elastic gasket.

Through the avoidance of the high bending stress, through the only relatively insignificant deformation in the pressure direction as well as through the selection of suitable cross-sections, which guarantee the compressive strength of the thermoplastic sealing material, it is ensured that the behavior of the thermoplastic gasket does not change unacceptably strongly during its lifetime.

The required equalization of tolerances as well as the necessary prestressing is achieved from the other side of the filling by the fact that the gasket on the rib is designed as a profile with high compliance and elasticity, which profile is stressed essentially in bending. This gasket maintains the required pre-tension, since, as mentioned above, it is not made of thermoplastic material, but of an elastomer with lasting elasticity.

The fixing strip's gasket thus forms exclusively a stop, which only needs to be deformed to such an extent that unevenness in the surface of the filling and the fixing strip is equalized and the necessary tightness is achieved.

As far as the frame according to the invention is placed on the outside of a building, it is preferred to arrange the fastening strip with its sealing base on the inside of the building.

According to one embodiment of the invention, the sealing surface is designed flat and provided with massive, longitudinal beads projecting towards the filling. These can have a blunt, roof- or sawtooth-shaped profile. The bead profile is preferably rounded. The profile must be compressed so that the free edges of the beads are at least not bent, in order to avoid high bending loads and thus high stresses. It is therefore preferred that the free edges of the longitudinal beads are strongly rounded. A circular segment to semi-circular profile in principle is advantageous with respect to extrusion and allows a favorable stress distribution.

Through the design of these longitudinal beads, when these in turn abut against the filling, the compressive stresses, which occur in the thermoplastic material and which in and of themselves are already low, quickly decrease in the direction of the fastening strip and are so low that the thermoplastic material no longer flows; So the tension is maintained.

The top angle of the said longitudinal beads is preferably not less than 60 degrees.

Two beads are preferably placed. If the beads have a sawtooth profile, they are preferably arranged so that the flatly falling flank of the bead faces away from the center of the filling at all times, so that the steeply falling flank faces this centre. This improves the sealing effect of the longitudinal beads.

According to a further preferred embodiment of the invention, a traditionally shaped sealing lip is arranged at the edge of the fastening strip's seal that faces the center of the filling, which in turn faces the center of the filling and rests against the filling with the end that is away from the party list. Such a lip-shaped sealing strip, which is formed from thermoplastic material, is in principle loaded on bending, so that the described stress reduction can take place in the material of this strip. However, this is not harmful, as the thermoplastic sealing base, as already stated, does not act as a tolerance compensation, but instead as only a limited yielding stop, so that even a far-reaching tension-free, weak contact of the lip-shaped strip against the filling is sufficient, to form a extra seal to increase security. In this way, the sealing substrate, in contrast to its traditional designation, only forms a gasket as a side effect. Its main task is the formation of a counterweight for the filling. The sealing function is taken over by the lip.

The longitudinal beads can, as mentioned above, also have a roof profile, although a wedge-shaped gap is then formed between the bead flank and the filling, which wedge gap opens towards the middle of the filling. Particularly when this roof-shaped design of the longitudinal strips occurs together with the arrangement of a sealing lip, however, the sealing function is taken over by this.

The lip can be co-extruded together with the strip at a suitable place of the fastening strip and separated from the sealing substrate; preferably, however, the sealing base and the lip jointly form a single seal, to simplify manufacture.

The surface of the sealing substrate, which abuts the filling, can also be made in the form of e.g. three ribs or just one rib, provided that the surface is designed so that when the substrate is compressed through bearing against the filling already after a short stretch of deformation, it no longer gives in any further, all the while the loaded material cross-section, already at a small distance from the ridges of the ribs or beads which first comes into contact with the filling, becomes so great that the compressive stress is equivalent to

end small.

If several beads are arranged, - e.g. according to fig. 4 - the bead which lies close to the center of the filling must at the same time be designed as a seal and accordingly be arranged on the edge of the sealing strip which is close to the center of the filling.

The material for the gasket pushed into the rib is preferably synthetic rubber, most preferably APTK.

This package could, for example, be a

reusable lip seal, whose cross-section is primarily loaded in bending. However, in order to achieve a particularly high load capacity at the same time as a good sealing effect, according to a further embodiment of the invention it is proposed that the gasket, which is pushed into the rib, is designed as a hollow profile tube, the section of which, which abuts the filling, ensures the sealing , while the sections that extend between the infill and the rib are loaded in bending, without the infill's contact force which produces the deformation having to be very large.

In addition, it can still be advantageous to stiffen this hollow-profile hose through a transverse step, which preferably extends obliquely in relation to the direction of compression.

In order to achieve better sealing, according to a further embodiment of the invention, at least one sealing lip is also designed on the hollow profile tube, which extend towards the center of the filling.

As the seal, which is pushed into the rib, is preferably arranged on the side that is exposed to the weather and wind, this additional lip seal prevents water from entering the area of the hollow-profile hose adjacent to the filling, which in turn deforms when tolerances occur.

The previously used material for thermoplastic co-extruded gaskets is soft PVC, which is, however, prone to plasticizer migration and extraction, which in addition over time leads to embrittlement and to a deterioration of the adhesion to the fastening strip.

The sealing substrate can e.g. consist of a soft polyethylene.

In order to further improve the stability and elasticity of the gasket further developed as a sealing base, according to the invention, it is proposed that its thermoplastic material is assembled according to patent claim 9. Such a material is considerably more resilient than soft polyvinyl chloride.

Moreover, with this composition it is also possible to weld the material together without further ado, as no plasticizer evaporation can occur and thus no embrittlement either. Fastening strips of any length and also in the miter can thus be welded together without any problems.

Additives can be added to this preferred base material to further improve its aging resistance and reversibility as well as coloring, as stated in patent claim 10.

The preferred embodiment of the invention is described in connection with the attached schematic drawings as an explanatory example and where: Fig. 1 shows a cross-section through a frame rod of the frame according to the invention, approximately in natural size; Fig. 2 shows detail A according to fig. 1 on an enlarged scale; Fig. 3 shows another embodiment of the one in fig. 2 showed design; and

fig. 4 shows a third embodiment of the same.

The one in fig. 1 shown, highly schematic frame rod shows a plastic hollow profile rod 1, which has a surface 2 on the inside of the building and on the outside of the building a surface that lies directly opposite this, as well as a surface 5 that faces a filling designed as a double-glazed pane 4.

Close to the surface 2, the frame rod 1 is extended in the direction towards the glass pane 4 with a projecting step, in which a receiving groove 6 is formed, which faces away from the rod 1.

At the outer side 3, the frame rod 1 is extended in the direction of the double-glazed pane 4 with a projecting rib 7, which presents a surface parallel to the surfaces 2, 3, which is turned

against the glass pane 4 and a further recording groove 8 is designed.

The recess that faces the glass pane 4 and is arranged between the step with the groove 6 and the rib 7 is filled through an inserted profile rod 9. Between the surface of the profile rod 9 that faces the glass pane 4 and the latter, an insert 10 is placed which equalizes tolerances.

A fastening strip 11, which is designed as a hollow profile rod, is pushed into the receiving slot 6. One of the side walls of this fastening strip 11 rests against the surface of the step of the rod 1 as well as against the surface of the rod 9 and exhibits an anchoring step which engages in the receiving groove 6. A further wall of the fastening strip 11 extends perpendicular to the latter wall and forms with the rod 1 surface 2 a smooth inner surface. The wall 12 of the fastening strip which faces the pane of glass 4 extends approximately parallel to the pane of glass 4 and is somewhat longer than the wall which smoothly transitions into the inner surface 2 of the rod 1, so that the edges of the latter wall facing the filling as well as the wall 12 is connected to each other through a fourth wall 13, which extends obliquely in relation to the glass panes 4.

So far, the construction described as an exemplary embodiment is known.

On its surface facing the pane 4, the wall 12 has a step, in which extends a co-extruded, yielding sealing substrate 14, which also merges into the wall 13.

The sealing base 14 and the adjacent walls 12, 13 of the fastening strip 11 are denoted by A and are shown on an enlarged scale in fig. 2 respectively - in another embodiment - in fig. 3, and which is further described below.

The sealing base 14 forms, towards the inside of the frame, only a limited yielding end stop for the glass pane 4 with a steep upwardly curved spring curve.

Between the outer side of this pane 4 and the opposite surface of the rib 7 of the rod 1, an APTK hose 15 is inserted, which between the mentioned surfaces is compressed into an oval shape. The spring curve for this hose's compression motion rises flat.

On the side of the hose 15 that faces the rib 7, it has a fastening step with a mushroom-like cross-section, which is carefully pushed into the receiving groove 8, which is

cut out in rib 7.

This step 16 is extended transversely through the inner space of the hose 15, forming an obliquely extending transverse step 17.

At the area of the hose 15 that faces the pane of glass 4 and away from the rod 1, a sealing lip 18 is formed which presses elastically against the pane of glass 4.

In fig. 2, detail A is shown on an enlarged scale.

As can be seen, the sealing substrate 14 is fitted in a step in both the wall 12 and the wall 13, as it is ensured through corresponding curvatures that the walls 12, 13 essentially have the same wall thickness throughout.

The sealing substrate 14 has a section which is connected to the wall 12 through co-extrusion and whose surface 21, which faces the glass pane 4, runs parallel to the wall 12.

Projecting from the surface 21 are two longitudinal beads 19, 20, which exhibit an approximately sawtooth-shaped profile with a flank, extending approximately at right angles to the surface 21 and facing the sealing lip 22, to be described further below, as well as a flank which falls flat in relation to the surface and points in the opposite direction. The angle between the two flanks is approx. 70 degrees, but the edge of the two longitudinal beads 19, 20 which faces the glass pane 4 is strongly rounded.

The height of the two longitudinal beads 19, 20 above the surface 21 corresponds approximately to the thickness of the sealing substrate 14 between this surface 21 and the wall 12 of the fastening strip 11.

The width of the two longitudinal beads, measured at the height of the surface 21, as well as the mutual distance is approximately more than twice the thickness of the sealing substrate 14, measured between the surface 21 and the wall 12 of the fastening strip 11.

The height of the longitudinal beads is preferably approx. 1.25 mm, width approx. 3 mm.

At the transition between the walls 12 and 13 of the fixing strip 11, a long sealing lip 22 is formed, which from this transition area tapers in the direction towards the middle of the glass pane and as in fig. 2 is shown in its rest position,

in which it protrudes far beyond the free edges of the longitudinal beads 19, 20. In the assembled state (cf. Fig. 1), however, this sealing lip 22 is strongly deformed (in Figs. 2 and 3 upwards), whereby it lies tightly against the glass pane 4, whose surface facing the sealing lip 22 lies on the longitudinal strips 19, 20 , which is then only slightly compressed, and thus roughly coincides with the above-mentioned connecting line.

The embodiment according to fig. 3 essentially corresponds to that according to fig. 2, with the exception that (if the overall dimensions are maintained) the longitudinal beads 23, 24 are no longer shaped like saw teeth like the longitudinal strips 19, 20, but roof-shaped, whereby in cross-section they have the shape of a flat isosceles triangle with a strongly rounded tip.

Fig. 4 shows an embodiment of the non-extruded sealing substrate, which is loaded under pressure and where there is no lip seal 22. In the case of the seal according to fig. 4, the sealing substrate 14 is likewise provided with two ribs or beads 30 and 31. The rib 30 appears here as a flat domed ridge, which extends near the middle of the height of the sealing substrate 14, while the other rib 31 is designed in a similar way to the ribs 20 and 19 according to fig. 2 and is located at the upper edge, so that the free rounded edge of the gasket 31 also takes over the function of the lip seal 22.

To ensure the latter, the rib 31 is somewhat steeper and higher than the rib 30, so that the rib 31 in any case comes into contact with the filling 4.

Since the stress on the rib is essentially a compressive and not a bending stress, the seal's limiting surface 32 is arranged almost horizontally.

For the production of the sealing substrate 12 was used

after chlorinated polyethylene (CPE), namely with 30 to 42% chlorine content. This material alone has a Shore A hardness of approx. 55 (DIN 53505, 10s).

The post-chlorinated polyethylene is mixed with nitrile rubber NBR with a ratio between butadiene and acrylonitrile of 55 to 45 - 82 to 18 (preferably 67 to 33) in order to achieve a satisfactory recovery elasticity. As the Shore hardness due to the addition of nitrile rubber is not yet sufficiently increased, polyvinyl chloride with a K number of 58 to 78 (preferably 70) with a plasticizer absorption of at least 30% (DIN 53417, part 1) is added to the mixture.

The usual PVC stabilizers and preferably filler such as chalk and corresponding pigments are added to the mixture thus obtained for the desired color setting.

As additives, 0 to 0.5 parts azo-dicarbonamide, 0 to 20 parts calcium carbonate, uncoated, 1.5 to 2.5 parts barium-cadmium laurate and/or barium-cadmium stearate and/or barium-cadmium- myristinate, 0.4 to 0.6 parts organic phosphite as a co-stabilizer for the above barium compounds with a refractive index nD<20> = 1.515 to 1.525, and 1 to 2 parts epoxidized soybean oil.

For a black color, 0.5 to 1.5 parts of flame soot or gas soot are added, while for a white color, 4 to 8 parts of rutile-type titanium dioxide are added. This material was fed to a coextrusion tool, along with a

hard PVC composition, which contained CPE as an impact strength component. The coextrudate was calibrated and given the design shown in the drawings.

The material of the sealing substrate had the following mechanical values:

The tear-off strength of the fixing strip's co-extruded sealing substrate amounts to more than 70 N/m 3.

The device according to the invention was described in connection with a door or window frame, but can also be used in other contexts, e.g. at room dividers, as on. in the same way as a door leaf frame is made up of plastic hollow profile rods and a filling.

For a better understanding of the invention, reference is finally made to the fact that the compression of the gasket 15 during the installation of the double pane 4 amounts to approximately eight to twelve times the compression of the sealing substrate 21.

Claims (10)

1. Frame construction part with inserted filling, in particular window or door frame of profile rods (1) which are connected to each other at the corners, where a rib (7) is arranged on each profile rod (1), preferably on the outer side of the frame (3), where on the opposite side, i.e. preferably on the inside of the frame (2), a fixing strip (11) made of plastic, especially of impact-resistant hard PVC, is placed, as both the rib (7) and the fixing strip (11) are provided with a seal of deformable material, namely a seal (14) co-extruded with the fastening strip (11) and a seal (15) whose foot (16) is inserted into a groove (18) in the rib (7), where the seal (15) has a profile with high elasticity which is mainly stressed by bending, and where the two seals (14, 15) are prestressed against a filling (4), e.g. a glass pane or a door filling, characterized in that the co-extruded seal (14) consists of a thermoplastic elastomer based on chlorinated polyethylene, polyvinyl chloride and nitrile rubber with steep spring characteristics, and that the opposite seal (15) is designed as a hollow profile tube of a synthetic rubber with high compressibility and flat spring characteristics. 2. Frame construction part according to claim 1, characterized in that the seal (14) of the fastening strip (11) has a mainly flat shape and exhibits on its surface (21) facing the filling (4) at least one, preferably two massive longitudinal beads (19, 20, 23 , 24, 30, 31). 3. Frame construction part according to claim 2, characterized in that the longitudinal beads (19, 20, 23, 24, 31) have a roof or sawtooth profile, if the edge facing the filling (4) is preferably rounded and whose flanks form an angle that is not less than approx. 60°. 4. Frame construction part according to claim 2, characterized in that the bead profile (30) is rounded. 5. Frame construction part according to one of claims 1-4, characterized in that the side of the seal (14) which faces away from the associated profile rod (1) is designed with an elastic lip (22) which rests against the filling (4). 6. Frame construction part according to one of claims 1-5, characterized in that the seal (15) inserted in the rib (7) is formed from APTK. 7. Frame construction part according to claim 6, characterized in that the seal (15) designed as a hollow profile tube preferably exhibits an internally lying transverse step (17). 8. Frame construction part according to claim 6 or 7, characterized in that the side of the seal (15) which faces away from the associated profile rod (1) is designed with at least one sealing lip (18) which rests against the filling (4). 9. Frame construction part according to one of claims 1-8, characterized in that the seal (14) co-extruded with the fastening strip (11) consists of the following materials in the given quantities/size ratios: a) 40 - 60 parts (preferably 50 parts) chlorinated polyethylene with a chlorine content of 30 - 42% (preferably 36%), b) 20 - 30 parts polyvinyl chloride with a K number of 58 - 78 (preferably 70) and a plasticizer uptake of at least 30%, and c) 20 - 30 parts nitrile rubber NBR with a ratio of butadiene to acrylonitrile of from 55-45 to 82-18 (preferably 67-33). 10. Frame construction part according to claim 9, characterized in that the seal (14) co-extruded with the fastening strip (11) contains at least one of the following additives: d) 0-0.5 parts azo-dicarbonamide, e) 0-20 parts calcium carbonate, uncoated, f) 1.5-2.5 parts barium-cadmium laurate and/or barium-cadmium stearate and/or barium-cadmium myristinate, g) 0.4-0.6 parts organic phosphite as co-stabilizer to f) with a refractive index nD<20> = 1.515 - 1.525, and h) 1 - 2 parts of epoxidized soybean oil, as well as i) for black coloring 0.5 - 1.5 parts of flame soot or gas soot, respectively j) to whitening 4-8 parts titanium dioxide of the rutile type.