ANTI-DUST COATING FOR A GLASS ENCLOSED CHAMBER CONTAINING A VENETIAN BLIND

Description

Field of application of the invention

[0001] The present invention relates to Venetian blinds within glass-enclosed chambers in general and in particular to an anti-dust coating for a glass enclosed chamber containing a Venetian blind.

Review of the known art

[0002] Venetian blinds, on an aluminium frame placed inside a chamber formed by panes of glass, present a disadvantage owing to the fact that, during their vertical movement, the slats tend to rub against lateral parts of the frame.

[0003] Both DE U 201 11 569 and GB A 2 330 168 disclose lateral metal parts of a frame for slatted Venetian blinds within a glass-enclosed chamber. Lateral strips for guiding the slats are fixed to the inner surface of the metal frame.

[0004] This drawback is even more serious when the frame comprises vertical strips placed between the glass and the slats to prevent direct contact between them.

[0005] Abrasion between the slats and the frame causes formation of a dark-coloured dust that first deposits on the ends of the slats but, due to vibrations set up during movement, spreads over their entire surface.

[0006] This dust creates a practically indelible stain on the slats.

[0007] DE A 31 13 957 suggests to coat the internal surface of the slat guides to facilitate the vertical sliding movement made when the blind is raised or lowered and to increase resistance to abrasion by said slats so preventing any squeaking noise but above all friction with parts of the frame producing a dark-coloured dust that forms indelible stains on the surface of the slats.

[0008] US 6 287 383 B1 discloses an apparatus for producing a visibly enhanced textured surface on slat material extruded to form a slat for a blind assembly. After extrusion and texturing processes, the slat material is passed through a spray painting station applying a substantially thicker coating of paint to the raised areas than to the adjacent lower areas. The painting station is Particularly configured to minimize variations in paint coverage along the top surface of the slat material. Such variations, which are be caused by radial variations in the density of paint droplets within the conical pattern and by the fact that the centre of the top surface passes under the conical pattern for a longer time than the outer edges of this surface, are minimized by configuring the painting station so that the conical pattern overextends the width of the slat material. The slat material is pulled along a longitudinally extending support channel by the conveyer system. Gutters extend along the support channel to collect paint sprayed beyond either side of the slat. Paint accumulated in the gutters flows away from the painting station through drain hoses. The apparatus disclosed in US 6 287 383 B1 is Particularly referred to spray paint on slat material extruded and thus not to a three-dimensional structure such as the lateral metal parts of a frame with lateral strips for guiding the slats of Venetian blinds within a glass-enclosed chamber. That is proved by the fact that the conical spray pattern overextends the width of the slat material, so the parts of the frame that will be glued to the panes of glass to make the chamber airtight would be coated too, although they should not.

Summary of the invention

[0009] Subject of the disclosure consists in an installation for a sprayer-applied coating of at least a surface of an element to be coated, the installation including:

• supporting means of said element:
• a sprayer of a coating product placed above said supporting means;
• translating means of said element under the sprayer;

wherein according to the invention:

• said supporting means comprise two or more horizontal rollers;
• said translating means comprise two or more pairs of vertical rollers in contact with the element:
• the position of the sprayer and the amplitude of spraying cone being such to coat only the internal faces of said element facing towards the sprayer when the element is constituted by a pair of lateral metal parts of a frame placed side-by-side and respective lateral guide strips facing towards the sprayer and fixed to said lateral metal parts for guiding the slats of a Venetian blind, as described in claim 1.

[0010] Further characteristics of the present invention, considered innovative, are described in the dependent claims.

[0011] The above disclosure solves the problem of excluding form coating parts of the frame that will be glued to the panes of glass by simple and inexpensive means as will now be explained.

[0012] According to an aspect of the invention, the sprayer lies along the longitudinal axis of said pair of lateral metal parts.

[0013] According to another aspect of the invention, said coating is a product to facilitate sliding movement of the edges of the slats when the blind is raised or lowered to open or close it, and to improve resistance to friction between slats and metal so Preventing any squeaking noise as well as production of a dark-coloured dust.

[0014] The coating is obtained by application of a suitable product to the parts that come in contact with the slats.

[0015] The product is so applied as to exclude those parts of the frame that will be glued to the panes of glass to make the chamber airtight.

[0016] The product is transparent, resistant to U.V. rays and is of a kind that will not give off volatile substances which could pollute the glass walls of the chamber.

[0017] In one type of execution the product is a polytetrafluoroethylene.

[0018] In another type of execution the product is a polyalkylsiloxane.

[0019] Coating on the external sides of the pair is avoided by the amplitude and position of the sprayer cone and, on the internal faces, by reciprocal contact.

[0020] In this installation the pair of frame parts is supported by two or more horizontal rollers and drawn along by two or more pairs of vertical rollers.

[0021] The two elements of each pair of vertical rollers are placed one on either side of the pair of frame parts.

[0022] On completing application of the product, the coated parts are placed in a drying oven.

Short description of the figures

[0023] Characteristics and purposes of the disclosure will be made still clearer by the following examples of its execution illustrated by diagrammatically drawn figures.

Fig. 1 Glass-enclosed chamber with Venetian blind supported by a frame comprising lateral tubular parts with a guide strip for the slats, perspective.

Fig. 2 Detail of the chamber in Figure 1 at the position of a slat, cross section.

Fig. 3 Detail of the chamber in Figure 1 showing a lateral metal part without slat guide, at the position of a slat, cross section.

Fig. 4 Installation for application by roller of a coating on the surfaces of lateral metal parts facing towards the slats, perspective, not included in the claims.

Fig. 5 Cross section of the installation in Figure 4.

Fig. 6 Installation for application of the coating by a sprayer to surfaces of a pair of metal parts facing towards the slats, perspective.

Fig. 7 Cross section of the installation in Figure 6.

Fig. 8 Detail of a pair of frame parts in the coating sprayer, cross section.

Fig. 9 Detail of the glass-enclosed chamber in Figure 1 showing metal parts with the slat-guiding strip, the internal faces of which are coated, cross section.

Detailed description of some preferred forms of realizing the invention

[0024] The glass-enclosed chamber 10 comprises the frame 14 and panes of glass 38, 40.

[0025] The frame 14 consists of the upper 16, lower 18 and lateral 20 parts, and comprises the upper fixed box 50.

[0026] The Venetian blind 58 comprises the slats 60 with holes 62 for the cords 64 fixed below to the lower mobile box 54. With said cords 64, the blind can be lowered and raised by devices placed inside the upper fixed box 50, and which for simplicity are not described.

[0027] The filling 42 in the space around the frame 14 of the glass-enclosed chamber, can be seen in Figures 2 and 3.

[0028] The lateral metal parts 20 of the frame 14, with slat guiding strips 22, present internal faces 30, external faces 32 and sides 34, 35 to which the glass panes 38, 40 are fixed by glue.

[0029] Abrasion at the ends of the slats, when moving up or down, against the internal faces 30 of the lateral metal parts 20, as happens at present, and of the slat guide strips 22, not only produces an annoying squeak but also a dark-coloured dust that settles on the ends of the slats, gradually moving across their entire surfaces and leaving practically indelible stains 66 (Figures 2, 3).

[0030] To avoid these drawbacks a coating of protective material, 85 (Figure 4) and 110 (Figures 6, 8, 9), is applied to the internal faces 30 of the frame's lateral metal parts 20 and to the slat guide strips 22, that not only eases the sliding movement of the slats against the internal faces of said lateral parts, but also prevents production of the dark-coloured dust and therefore of the stains 66 (Figures 2, 3). Installations such as 70 and 90 are used to apply this coating.

[0031] The alternative unclaimed installation 70 (Figures 4 and 5) comprises the roller 74, with pin 76, partially immersed in the coating liquid 82 in the bath 72.

[0032] The shaped faces 78, 80 of said roller 74 match respectively with the internal face 30 of the tubular part 20 and with the internal face of the guide strip 22 for the slats 60.

[0033] As clearly seen in Figures 4 and 5, by means of an axial sliding movement of the metal part 20, the liquid 82 is transferred to said internal faces 30 of said part 20 and of the guide strip 22, so forming a protective coating.

[0034] The installation 90 comprises the sprayer 104 fed through tube 106.

[0035] A pair of metal parts 20, 20', with their sides 35, 34' placed together, are made to slide under the sprayer cone 104 supported by horizontal rollers 92, 94 and drawn along by the pairs of vertical rollers 96,97 and 100,101 as illustrated in Figures 6 and 7.

[0036] It will be seen that the sprayer cone 108 lies substantially along the longitudinal axis of the pair of metal parts 20 and 20' so that the internal faces 30 and 30' of said parts 20 and 20' receive the sprayer applied coating 110 and 110'.

[0037] This coating is not extended to the sides 34, 35 and 34' 35' of the metal parts.

[0038] Exclusion from coating of the external sides 34 and 35' of the pair of parts is ensured by adjustment of the sprayer cone and, of the internal sides 35 and 34', by their reciprocal contact.

[0039] Figure 9 illustrates the metal part 20 the faces of which are turned towards the slats 60 and are protected by the coating 85 or 110.

[0040] This coating prevents abrasion of the metal due to friction with the edges of the slats, thus preventing production of the dark-coloured dust with all its attendant negative effects.

Claims

1. Installation (90) for a sprayer-applied coating of at least a surface of an element (20, 22; 20', 22') to be coated, the installation including:

- supporting means of said element;

- a sprayer (104) of a coating product (82) placed above said supporting means;

- translating means of said component under the sprayer; characterized in that:

- said supporting means comprise two or more horizontal rollers (92, 94);

- said translating means comprise two or more pairs of vertical rollers (96, 97; 100, 101) in contact with the element (20, 20');

- the position of the sprayer (104) and the amplitude of spraying cone (108) being such to coat only the internal faces (30, 30') of said element (20, 22; 20', 22') facing towards the sprayer when the element is constituted by a pair of lateral metal parts (20, 20') of a frame (14) placed side-by-side and respective lateral guide strips (22, 22') facing towards the sprayer (104) and fixed to said lateral metal parts (20, 20') for guiding the slats (60) of a Venetian blind (58).

2. Installation as in claim 1, characterized by the fact that said sprayer (104) lying along the longitudinal axis of said pair of lateral metal parts (20, 20').

3. Installation as in claim 1, characterized by the fact that the two vertical rollers of each pair (96, 97; 100, 101) being placed one on either side of the pair of lateral metal parts (20, 20').

4. Installation as in claim 1, characterized by the fact that said coating (110, 110') is a product to facilitate sliding movement of the edges of the slats (60) when the blind (58) is raised or lowered to open or close it, and to improve resistance to friction between slats and metal so preventing any squeaking noise as well as production of a dark-coloured dust.

5. Installation as in claim 4, characterized by the fact that said product (82) is transparent, is resistant to U.V. rays and will not give off volatile substances that can pollute the glass-enclosed chamber.

6. Installation as in claim 4, characterized by the fact that said product (82) is polytetrafluoroethylene.

7. Installation as in claim 4, characterized by the fact that said product (82) is poly-alkylsiloxane.

8. Installation as in any one of the preceding claims, characterized by the fact that said product (82) is dried out in an oven.

Ansprüche

1. Anlage (90) für einer Sprayer-aufgebrachter Beschichtung von mindestens einer Oberfläche eines zu beschichtenden Elementes (20, 22; 20', 22'), wobei sie Anlage umfasst:

- Stützmittel des besagten Elementes;

- ein Sprayer (104) eines beschichtenden Werkstoffes (82), der über den besagten Stützmitteln gelegen ist;

- bewegliche Mittel des besagten Teiles unter dem Sprayer;

dadurch gekennzeichnet, dass

- die besagten Stützmittel zwei oder mehrere waagerechte Rollen (92, 94) umfassen;

- die besagten bewegliche Mittel zwei oder mehrere paare senkrechte Rollen (96, 97; 100, 101) umfassen, die in Berührung mit dem Element (20, 20') sind;

- die Lage des Sprayers (104) und die Weite des Sprühkegels (108) so bemessen sind, dass sie nur die inneren Flächen (30, 30') des besagten Elementes (20, 22; 20', 22') beschichten, die dem Sprayer zugewandt sind, wenn das Element aus einem Paar seitlicher Metallteile (20, 20') eines Rahmens (14) besteht, die nebeneinander gelegen sind, und aus entsprechenden Streifen für eine seitliche Führung (22, 22'), die dem Sprayer (104) zugewandt sind und mit den besagten seitlichen Metallteilen (20, 20') befestigt sind, um die Lamellen (60) einer Jalousie (58) zu führen.

2. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass der besagte Sprayer (104) entlang der Längsachse des besagten Paares von seitlichen Metallteilen (20, 20') liegt.

3. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass die zwei senkrechte Rollen jedes Paares (96, 97; 100, 101) auf jeder Seite des Paares von seitlichen Metallteilen (20, 20') gelegen sind.

4. Anlage nach Anspruch 1, dadurch gekennzeichnet, dass die besagte Beschichtung (110, 110') ein Produkt ist, um eine gleitende Bewegung der Ränder der Lamellen (60) zu vereinfachen, wenn die Jalousie angehoben oder abgesenkt wird um sie zu öffnen oder schließen, und um den Reibungswiderstand zwischen Lamellen und Metall zu erhöhen, um so jeden Quietschen, wie auch die Erzeugung eines dunkelfärbigen Pulvers zu verhindern.

5. Anlage nach Anspruch 4, dadurch gekennzeichnet, dass das besagte Produkt (82) transparent ist, gegen UV-Strahlen beständig ist und keine flüchtige Stoffe abgibt, die die verglaste Kammer verschmutzen können.

6. Anlage nach Anspruch 4, dadurch gekennzeichnet, dass das besagte Produkt (82) ein Polytetrafluorethylen ist.

7. Anlage nach Anspruch 4, dadurch gekennzeichnet, dass das besagte Produkt (82) ein Polyalkylsiloxan ist.

8. Anlage nach jeder der vorangehenden Ansprüchen, dadurch gekennzeichnet, dass das besagte Produkt (82) in einem Ofen getrocknet wird.

Revendications

1. Installation (90) pour un revêtement appliqué avec pulvérisateur d'au moins une surface d'un élément (20, 22' ; 20', 22') à revêtir, l'installation comprenant :

- des moyens de support du dit élément ;

- un pulvérisateur (104) d'un produit de revêtement (82) placé sur les dits moyens de support ;

- moyens de translation du dit composant au dessous du pulvérisateur;

caractérisé en ce que :

- les dits moyens de support comprennent deux ou plusieurs rouleaux horizontaux (92, 94) ;

- les dits moyens de translation comprennent deux ou plusieurs couples de rouleaux verticaux (96, 97 ; 100, 101) en contact avec l'élément (20, 20') ;

- la position du pulvérisateur (104) et l'amplitude du cône de pulvérisation (108) étant en manière de revêtir seulement les surfaces intérieures (30, 30') du dit élément (20, 22 ; 20', 22') dirigé vers le pulvérisateur, quand l'élément est constitué par un couple de parties métalliques latérales (20, 20') d'un châssis (14) placé côté-côté et des respectives bandes latérales de guide (22, 22') dirigées vers le pulvérisateur (104) et fixées aux dites parties métalliques latérales (20, 20') pour guider les lamelles (60) d'un store Vénitien (58).

2. Installation selon la revendication 1, caractérisée en ce que le dit pulvérisateur (104) est situé le long de l'axe longitudinal du dit couple de parties métalliques latérales (20, 20').

3. Installation selon la revendication 1, caractérisée en ce que les deux rouleaux verticales de chaque couple (96, 97 ; 100, 101) sont placés un sur chaque côté du couple de parties métalliques latérales (20, 20').

4. Installation selon la revendication 1, caractérisée en ce que le dit revêtement (110, 110') est un produit pour faciliter un mouvement de glissement des bords des lamelles (60) quand le store (58) est soulevé ou baissé pour l'ouvrir ou le fermer, et pour améliorer la résistance à friction entre lamelles et métal en manière de prévenir chaque bruit de grincement comme aussi une production de poussière de couleur foncé.

5. Installation selon la revendication 4, caractérisée en ce que le dit produit (82) est transparent, est résistant au rayons X et n'émet pas des substances volatiles qui peuvent polluer la chambre vitrée.

6. Installation selon la revendication 4, caractérisée en ce que le dit produit (82) est polytétrafluoroéthylène.

7. Installation selon la revendication 4, caractérisé en ce que le dit produit (82) est poly-alkylsiloxane.

8. Installation selon une quelconque des revendications précédentes, caractérisée en ce que le dit produit (82) est séché dans un four.

Drawing