MXPA99007056A - Clamping device for connecting plastic and metal elements - Google Patents

Abstract

A clamping device for attaching plastic panels against metallic frames/profiles (3), for use in cabins and vehicles, is provided by inserting an end portion of the plastic panel (1) into a preferably conical pocket (2) in the metal profile (3) and locking it in this position by pushing in a cord (4).

Description

FIXING DEVICE FOR CONNECTING PLASTIC AND METAL ELEMENTS DESCRIPTION OF THE INVENTION The invention relates to a fastening device for attaching a plastic panel or plate to a metal frame or profile, especially for use in cabins and vehicles. The combination of plastic and metal structures, such as profiles, has been widely applied within many fields. The different properties of the materials create the need to design the technical connection of the two materials in different ways, since the specific properties of the materials must be taken into account. The joining of plastic to metal profiles is a special problem area, particularly when using modern thermoplastics. The materials are often not suitable for welding, glueing and screwing or riveting together. The plastic is relatively weak at the loading points. In addition, the rest of the properties of the materials are different with respect to the heat / cool expansions, and therefore have a substantial influence on the design solution. When building cabins where there is a desire to combine a metal frame, preferably made of extruded metal profiles, with panels or body sections made of modern thermoplastics, one faces considerable challenges with respect to the design surrounding the connection areas. from the metal profiles to the plastic panels. In the case of designs of this kind it is natural to allow the extruded profiles to form openings in the booths, such as doors, the ends of the windows, etc., and in this way a design is obtained which can be used to articulate, Screwing the windows, sticking in the windows, sealing strips, etc. Plastic panels or parts of the body can form three-dimensional basic elements which are then joined and incorporated with the metal profiles. The object of the present invention is to provide a fastening device which is especially suitable for use in the construction of such cabinets with a combination of plastic plates or panels and a metal frame. This objective is obtained with a fixation device which is characterized in the manner in which it is presented in the patent clauses. The invention will now be explained in more detail by means of the modalities which are presented in the drawings, in which: Figure 1 is a first embodiment of the invention, seen in a completely schematic section, with the inclusion of detail drawings for alternative designs of connecting cord, figure 2 is a variant of figure 1, with a clamping device, figure 3 is a variant of the design in figure 2, figure 4 is a further modality with a clamping device and Figure 5 is a variant of Figure 4. The drawings illustrate several alternative embodiments of the fixation device according to the invention in a completely schematic manner. In this way, Figure 1 illustrates the main design of the device according to the invention, wherein the end area of a plastic plate or a plastic panel which can form a part of a body, must pass within a receptacle 2 in a metal profile 3 in a vehicle cabin. The end of the plastic panel 1 is slidably fitted within the receptacle 2 which will enclose the edges of the end of the plastic panel, and thus forms a bonding area. In order to provide the plastic with a mechanical connection to the metal profile in these areas, it is designed in a special way. Here, the edge or end of the plastic panel 1 is inserted into the receptacle 2 of the profile. In the illustrated mode, the profile is designed with slots defined on one degree and an additional waveform on the other side, and possibly designed with a slight angle or conical shape in the opening area. After the end of the plastic profile 1 has been inserted into this slot, a partially elastic cord 4 is pushed into the receptacle or slot in the interior of the plastic part, which will cause the plastic panel to be pushed towards the corrugated plane in the receptacle 2, whereby it causes the cord 4 Hold tight and push down into the slotted / curved shapes on the edge of the receptacle. Since the rope 4 is elastically designed with an elasticity which can be firmer and more resilient than the plastic material, the plastic material will slide slightly upward on the corrugated surface, which provides a physical bond between the metal and the material plastic in the sliding direction. Alternatively, the end of the plastic profile is designed with a groove or flange directed upward on its outer edge, as illustrated in Figure 2. This flange is pushed upwardly formed, in the inner area of the receptacle 2 of the metal profile, so it ensures that the panel is unable to slide out of the receptacle. With such a design, it is not necessary to have a defined edge groove of the end surface of the receptacle. An alternative to this design is illustrated in Figure 3, which represents a "reverse" design to that of Figure 2, the rim is provided in the wall of the receptacle, while the end of the plastic panel has a groove.

In order to ensure that the elastic cord 4 does not loosen or fall during use for a period of time, when the elasticity in the cord 4 can be reduced and its resilience deteriorated, an immobilization profile 5 can be used as it is illustrated in figure 4. This fastening profile 5 can also be manufactured with an upwardly facing edge 6 which can cover a profiled part 7 of the plastic panel 1, part 7 whose end is inserted into the receptacle 2, as illustrated in Figure 5. By this means, it will be possible to ensure that the plastic panel 1 can not slide out of the receptacle 2, whereby it loosens its position in the connection with the metal profile 3. The locking cord 4 can be manufactured by extrusion with a circular section, a section in figure 8, or a wedge shape with a curved / corrugated surface, which is hooked onto the grooves / curves in the profile receptacle. These alternatives are illustrated in detail section drawings in Figure 1. The immobilization cord may also have a twisted structure. A special feature of the invention is based on the fact that the plastic exterior 8 is used at all times as a reference surface against the metal profile 3, so it is ensured that a controlled level is obtained for the outer sides of the panel of plastic and the profile element. This can be a problem particularly where the plastic panels / body parts are of different thicknesses. In the present invention, this is carried out by the rope which is pushed into the slightly conical shaped receptacle which is immobilized in such a way that it pushes the plastic edges of the outer side against the upper part of the metal profile independently of the thickness and irregularities of the plastic panel. The present invention also contributes with a point-free joining device which provides good distribution of the clamping forces and offers the possibility of thermal expansion and movement of the materials in relation to one another without large stresses and destruction of the panels. By using a continuous rope, an uninterrupted fastening can be obtained along the entire length of the profile receptacle into which the end portion of the plastic panel is inserted, an irregular thickness of the end section of the plastic panel in This direction will be absorbed by the cord and the cord will also act as a sealing strip.

Claims (7)

CLAUSES

1. Fixing device for attaching plastic panels to metal frames / profiles, especially for use in cabins and vehicles, characterized in that the end portion of the plastic panel is inserted in a preferably conical receptacle in the metal profile, and is immobilized in this position by a cord inserted under pressure.

2. Device as mentioned in clause 1, characterized in that the receptacle in the metal profile has approximately sharp ribs on the side which is oriented towards the outside of the plastic panel.

3. Device as mentioned in clause 1 or 2, characterized in that the receptacle in the metal profile has a roughly corrugated surface to immobilize the rope on the side of the receptacle which faces towards the inside of the plastic panel.

4. Device as mentioned in one of clauses 1 to 3, characterized in that the rope is elastic in the transverse direction.

5. Device as mentioned in one of clauses 1 to 4, characterized in that a projection edge or flange in the profile receptacle engages with the outer side of the plastic panel or a notch on the outer side, or where the outer side The plastic plate is designed with a flange which engages with a groove in the side surface of the profile receptacle.

6. Device as mentioned in one of clauses 1 to 5, characterized in that the rope is immobilized / fixed by a profile which pushes it into the receptacle and which is attached to the metal profile.

7. Device as mentioned in one of clauses 1 to 6, characterized in that the profile to immobilize and fix the rope has an outwardly directed profile part, which is immobilized against the trailing edge of the plastic panel by the collapsed panel arrangement of plastic in connection with the union against the main profile.