DE19517496A1 - Armoured roller blind - Google Patents

Abstract

The armoured roller blind (12) comprises metal slats (20). There is a conducting strip fastened to each metal slat so that they are all permanently connected to a protective conductor. The conducting strip is on the inside of the slats and is made from highly flexible tinned copper woven mesh. The fasteners are rivets. There are conducting washers between the conducting strip and the slats at the rivet points, turned up at the edges about the strip. They are made from galvanically neutral, corrosion- resistant material, as also are the rivets. The blind is wrapped up around a metal tube with a shaft and a spring, the blind being permanently in electrical contact with the tube.

Description

Roller shutter curtains are known, consisting of one another stuck, metallic slats in the side guides ongoing, instead of swinging out doors who used the. Closing and opening devices are also known, preferably in the version with spring shaft, the one Roll up the shutter curtain and roll it through the shutter armor weight counteracting spring force in any holds open position.

The roller shutter curtains are in a common design to increase the tightness against the ingress of water and dust between the lamellar sealing inserts and in the side guides sealing lips retracted. As such Executed, robust roller shutter curtains preferably exist made of anodized, double-walled aluminum slats. These are used especially in vehicle construction instead of swing out Doors in emergency vehicles - such as B. fire and Equipment vehicles - used.

Due to the anodized surfaces and the isolie sealing inserts there is no electrically conductive Ver binding of the slats to each other and not between Slat and other guide and construction parts.  

Switch and distribution cabinets for receiving and are known to protect electrical and electronic switching and Control devices, for example for power distribution, control of machines and processes, e.g. T. constructive in Integrated machine units, e.g. T. lined up as a switch plants executed.

Such a control cabinet is usually made of metal and is closed in the usual way by means of a metallic, pivotable door. In connection with the protective conductor system, a Faraday cage with the typical properties in relation to:
Dissipation of impermissibly high contact voltages, dissipation of capacitive and inductive charges as well as shielding against electrical and electromagnetic fields.

When installing this type of control cabinets are excluded the free spaces for opening the doors the free spaces for Be service and maintenance corridors as well as escape routes, accordingly the accident prevention regulations of the professional associations as well as the regulations VDE 0100 part 729. The Known control cabinet systems therefore also have limited door width, a large space requirement. The Open doors lead when performing work considerable disabilities within the control cabinets and increased risk of accidents.

The invention is based on this prior art based on the task, the advantages, the metallic Rol Have store armor instead of doors for which universal use in electrical switching and distribution to make usable cabinets usable. Requirement for this related use is compliance with regulations about protective measures with protective conductor inside closed ner control cabinets.

DIN VDE 0660 part 500 edition 4/91 section 7.4.3.1.5.C. adopted in: DIN VDE 0660 part 500 edition 4/94 IEN 60439 part 1.

The invention relates to the permanent maintenance-free inclusion of every lamella of a metal roller shutter curtain into the existing protective conductor system.

A roller shutter armor made of metal slats could be used Replacing plastic slats, art in itself fabric slats are neither heat nor aging resistant are particularly prone to breakage. In addition, they do not have any shielding properties against electrical and electro magnetic fields, while static charges ver cause dirt on the slats. Form plastic slats neither dustproof nor waterproof roller shutter curtain. The use such roller shutter armor instead of doors at elek electrical control and distribution cabinets of any kind not practical.  

A high-frequency-tight roller shutter is also known Electromagnetically shielded rooms and cabins at German Patent Office, patent specification 23 16 879. The connection of the slats with each other in this roller shutter version and the connection to the protective conductor system is made in principle via bare contact that is not protected against external influences surfaces. The electrotechnical functionality is through Pollution and oxidation impaired and z. B. with galvanic element formation (e.g. Cu / Al) up to the complete corrosion. Only through constant functional checks and Preventive maintenance can prove functional reliability and be preserved. The industrial use of Rolla In this version there are special applications - and therefore limited - reserved.

A roller shutter curtain achieves this task with the features of claim 1:
Characterized in that according to the characterizing part of claim 1 at least one flexible electrical conductor is provided, which is permanently, maintenance-free and electrically conductive connected by fastening means to each of the metallic slats of a roller shutter curtain and is in permanently electrically conductive connection to the protective conductor system.

In a preferred embodiment of the invention Roller shutter armor is a highly flexible electrical conductor les current band on the lamella sensor facing the interior te, in the end area of the lamella. In the same version tion and in the same arrangement is a second current band led near the other end of the slat. Through the two independent ladder guides and the two resulting from it the contact points to the lamella are electrical extraordinarily reliable meshing. This symmetrical Ensure the arrangement and flexibility of the current strips a smooth winding process of the roll armor  a spring shaft. The current band is a common, high flexible, flat-rolled fabric hose based on DIN 46444, consisting of a large number of tinned copper wires from E-Cu 58 according to DIN 1787, with a minimum cross cut from 4 sqmm per current band. By the inside Arrangement of the current bands is the aesthetic feeling when Looking at the switching or Distribution cabinet not affected.

In a further preferred embodiment of the Roller shutter curtain according to the invention is the respective Be fastener formed from a rivet that holds the current band and reaches through the associated slat. So that's one safe and permanent electrical connection between Lamella and current band made.

In a further, particularly preferred embodiment form of the roller shutter curtain according to the invention is between the Current band and the slat an erected on the edge Washer fixed by means of the rivet, the edge sides of the current band. This ensures that despite the rivet connection that penetrates the current band, this does not expand or tear open so that it does not close Functional impairments or destruction of the Strombandes itself comes. At the contact point of the document is the oxide or anodized layer on the disc Removed lamella by face milling, so that one is sufficient the, bare, contactable contact point is guaranteed.

In a further preferred embodiment of the invent According to the roller shutter curtain there is the washer and the rivet made of galvanically neutral material; the underlay disk z. B. made of brass and the rivet z. B. made of stainless steel. The washer, lying between the lamella and the current band, thereby neutralizes the formation of a galvanic element tes. The stainless steel rivet has the same effect. The con  tact areas remain free of corrosion. At the touch place the current band with the lamellae outside the rivet place, especially when winding and unwinding the Rol loading tank on a spring shaft, the anodized layer acts insulating and galvanically neutralizing on the lamella. The anodized layer resists due to the hard Surface, damaging the friction against the current band.

In a further particularly preferred embodiment of the Roller shutter curtain according to the invention is the electrical Ver bond between the protective conductor system and the current banks derenden manufactured by the spring shaft. The construct tion parts of the spring shaft are in the electrical Ver binding as electrical conductor included. As bearings that are not sufficiently conductive between the rotating outer tube of the spring shaft - on the the current bands, as described in more detail, electrically are laid on - and the fixed inner tube of the Spring wave, are by the helix according to the invention electrically bridged. This spiral is made of PVC Core cable, H07 V-K according to VDE 0281 part 103, 6 sqmm cross cut Cu and is inside the outer tube and through that same protected, in the space above the coil spring, in same winding direction as this, inserted. One end the helix is electrically conductive with the bearing washer be, which in firm and electrically conductive connection with the outer tube is firmly screwed. The other end of the Conductor coil is attached to the inner tube in an electrically conductive manner. At the same time, the screws are electrically conductive spring bridged at its ends only with its own NEN spring tension on the inner tube or the bearing washer the outer tube rests and thus as a permanent, elec trically conductive connection - also with regard to the elec trical conductivity of the spring steel cross-section - un is useful. In the same way as the closing or opening operation of the roller shutter curtain in the coil spring  Spring shaft tensions or relaxes, the conductor coil is un minimum stress. Based on 2 m Rol The length of the shutter armor is 50 mm approx. 10 revolutions of the spring shaft for the winding process. Transferred to 52 turns of the conductor helix results in a loading length of travel of 17 mm per coil turn. The two free current band ends coming from the roller shutter curtain electrically conductive on the outer tube of the spring shaft, below Use a galvanically neutral, set up on the side washer for galvanic isolation and mounting of the current band and using a galvanically new central rivet, which connects the current band, the washer and the Penetrated outer tube, each current band with two rivet joints dung, attached. The further connection to the customer Protective conductor system is carried out by an on-site conductor close to the accessible part of the bearing pin, in the extension of the inner tube into this welds and is thus connected in an electrically conductive manner.

The roller shutter curtain according to the invention is about use universal for switchgear and distribution cabinets electrical devices and equipment can be used.

The roller shutter curtain according to the invention exists exclusively from commercially available components and can therefore be inexpensive be produced, especially in series Production as a complete kit, both for new furnishings as well as for retrofitting existing equipment exercises.

The roller shutter curtain according to the invention is light and on the object inexpensive to assemble, because the related kits already for a built-in or front mounting and in extended The same version for use instead of several doors timely, are prepared. In addition, the inventor Roller shutter curtains according to the invention are advantageous in height and width  adapt to the respective openings.

The particular advantage when using the invention Roller shutter is that the space required for Installation of control and distribution cabinets through which Elimination of the doors, according to the regulations Dimension can be minimized. This makes the list of like control and distribution cabinets even under difficult and limited space practicable.

The use of the roller shutter curtain according to the invention facilitates Takes the necessary work within the Switch and distribution cabinets significantly and lowers the un fall risk considerably, since the disability due to open No doors.

Another advantage when using one especially before drafted embodiment of the roller shutter curtain according to the invention with light metal slats instead of the steel doors in addition to a general weight loss also the Advantage that the top-heavy, the switching and distribution closets with shallow depth and with open doors is peculiar, is diminished.

A particular advantage of the roller shutter panel according to the invention zers, in the version with light metal slats result from the better thermal conductivity compared to steel, because the operation of electrical switching and distribution devices arising inside the control and distribution cabinets Heat loss is dissipated cheaply to the outside.

It should also be mentioned that the described and in the drawing Components shown in form and design by can be designed differently, e.g. B. other slats lenprofile and rewinder with and without spring shaft, with deflections, supports or slidable etc., without these variants the features of Touch roller shutter curtain according to the invention.

The roller shutter curtain according to the invention is described below of the drawings sheets 1/2 and 2/2 explained in more detail. It shows gene:

Figure 1 is a perspective view of a switch cabinet with the roll-up armor that can be developed.

FIG. 2 shows a rear view of part of the slats of the roller shutter curtain according to FIG. 1 with the protective conductor connection;

Fig. 3 shows a longitudinal section III-III in Figure 2 by the point of contact lamella with the current band.

Fig. 4 in a schematic and simplified representation of a part of the spring shaft, which is used to wind up the roller shutter curtain, with the conductor coil.

In Fig. 1, a control panel as a whole is designated 10 shown, but without the male he switching and control devices. The opening of this switching cabinet 10 can be closed with the shutter 12 according to the invention. This roller shutter armor 12 is at its free end with an end strip 14 and hand 16 provided. A covered chassis 18 is also arranged on the control cabinet 10 and accommodates the spring shaft according to FIG. 4 for the purpose of winding up the roller shutter curtain 12 . The spring shaft arrangement in the interior of a control cabinet is also common. The roller shutter curtain 12 consists of metallic slats 20 .

On the side facing away from the viewer of FIG. 1 of the Rol loading tank 12 , the protective conductor connection in the form of the current strip 22 runs along the slats 20 . The protective conductor connection consists of two mutually parallel current strips 22 , each of which extends along the edge-side Endbe range of the slats 20 . In FIG. 2, one of these two current leads 22 is shown. Such a current band 22 consists of highly flexible, tinned copper braid in the form of a flat-rolled, braided fabric hose and, as shown in FIG. 2, is riveted to the back of the slats. The conductive cross section per current band 22 is at least 4 mm². The two current strips 22 are electrically conductive at the ends with the end strip 14 , and at the other ends electrically conductive with the outer tube 30 of the spring shaft Fig. 4 by a similar rivet connection, as shown in Fig. 3, is connected.

In Fig. 3 the longitudinal section III-III in Fig. 2 is shown by one of the contact points between a blade 20 and the current band 22 . At the location of the riveting, the anodized layer is worn abge by means of a milling cutter (not shown), so that a bare metal, planned surface has been created which ensures a permanent electrical and mechanical connection. The drill hole for inserting the blind rivet 24 has been introduced at the same time by the combined drilling and milling tool. As FIG. 3 shows further, a washer 26 is inserted into the cutout in the lamella 20 , which is set up on two opposite sides in the form of the current band 22 and thereby comprises this. The washer 26 is made of brass and its thickness protrudes from the cutout in the lamella 20 . As a result, the current band 22 is embedded in the galvanically neutral washer 26 without the current band 22 touching the milling edge on the lamella 20 . This prevents the formation of a galvanic element between the lamella 20 and the current band 22 . Before the riveting process, the current band 22 is expanded in the center by means of a mandrel (not shown) to prevent damage to the current band 22 when the rivet 24 is inserted. The rivet 24 is designed as a blind rivet DIN 7337 and is made of stainless steel. Due to its properties in terms of corrosion and galvanic neutrality, this is particularly suitable for this riveted joint. The rivet 24 itself is of no importance for the electrical conductivity of the contact point.

The riveting is carried out for blind rivets known way.  

The longitudinal compensation for the current band 22 guided during the winding-up process in the inner radius of the roller shutter curtain 12 takes place by the yielding of the highly flexible current band 22 between the rivets 24 .

It is advantageous to increase the corrosion before riveting protection against all contact surfaces - like in electronics technology known and practiced - with acid-free petroleum jelly easy to grease.

The roller shutter curtain 12 is in the usual way and there not described in detail, by means of a spring shaft, as shown in Fig. 4, wound up and unwound and z. B. opened or closed an opening. Therefore, the spring shaft is only described insofar as it is related to the invention.

The in Fig. 4 simplicity because of not shown roller shutter curtain 12 is on a whole with 30 designated tes, metallic, electrically conductive outer tube winding bar. The two current bands 22 are permanently, electrically conductive, permanently connected to the outer tube 30 in any position of the roller shutter curtain 12 via a bleached rivet connection (not shown) which has already been explained. The outer tube 30 is placed on the recess of the bearing plate 36 and permanently connected to one another in an electrically conductive manner by means of screws (not shown). Within the outer tube 30 runs - as an actuation aid for opening and closing the roller shutter curtain 12 - a coil spring 54 which is penetrated by the inner tube 44 .

By the coil spring 54 own ring tension this is drawn on a further recess of the bearing plate 36 on the one hand and on the other hand on the end of the inner tube 44 opposite the bearing plate 36 . Function and structure of the coil spring 54 are known in the prior art, so that this is not discussed in detail.

In Fig. 4 is further shown the conductor coil 34 according to the invention, which is positioned in the cavity of the spring shaft between the inner tube 44 and the outer tube 30 , on the coil spring 54 freely lying. The conductor coil 34 is on the one hand at the end of the interior 44 , with this train relieved, by means of screwed clamp 33 and screw 32 , permanently electrically connected. The other end of the conductor helix 34 is also strain-relieved on the bearing disk 36 and permanently electrically connected to it (clamp and screw not shown). The continuous protective conductor connection according to the invention via a spring shaft results from the bearing bolt 46 inserted at the end of the inner tube and firmly welded to one another, which is immovably mounted in a bearing part 48 inside the chassis 18 . The part not part of the invention connection to an existing protection circuit system is made by customer connection z. B. by means of an electrical line 52 as a screw fastening on the outer part of the bearing pin 46 .

All screw connections required for electrical conductivity each consist of brass screw with an underlying brass washer and an underlying, nickel-plated serrated washer to prevent corrosion and a self-loosening. The helix is provided with crimped or soldered cable lugs on both ends. Contact points on steel components, such as the inner tube 44 and the bearing pin 46 , are tin-plated against corrosion.

The foregoing description and drawings limit refer only to the information and characteristics as for the example embodiment of the invention are essential. Like this therefore features in the description and in the drawing disclosed and not mentioned in the claims, if necessary, they also serve to determine the Object of the invention.

Claims (11)

1. roller shutter ( 12 ) consisting of slats ( 20 ) made of tall, characterized in that at least one current band ( 22 ) is provided, which is connected by fastening means with the slats ( 20 ) such that a permanent, electrically conductive The lamellae ( 20 ) are interconnected and there is a permanent, electrically conductive connection to a protective conductor system. 2. Roller shutter curtain ( 12 ) according to claim 1, characterized in that the current band ( 22 ) runs on the inside of the slats ( 20 ) and consists of highly flexible, tinned copper braid in flat-rolled, braided fabric hose design. 3. roller shutter curtain ( 12 ) according to claim 2, characterized in that the respective fastening means is formed from a rivet ( 24 ) which passes through the current band ( 22 ) and the lamella ( 20 ) assigned to it. 4. roller shutter curtain ( 12 ) according to claim 3, characterized in that between the current band ( 22 ) and the La melle ( 20 ) a washer ( 26 ) by means of rivets ( 24 ) is fixed, which comprises the edge of the current band ( 22 ). 5. roller shutter curtain ( 12 ) according to claim 4, characterized in that the washer ( 26 ) consists of an electrically conductive material and that at the point of contact of the washer ( 26 ) with the La melle ( 20 ) a bright metallic surface for electrical contacting on the lamella ( 20 ). 6. Roller shutter curtain ( 12 ) according to one of claims 4 and 5, characterized in that the washer ( 26 ) consists of galvanically neutral, corrosion-resistant material. 7. roller shutter curtain ( 12 ) according to claim 3, characterized in that the rivet ( 24 ) consists of galvanically neutral, corrosion-resistant material. 8. roller shutter curtain ( 12 ) according to one of claims 1 to 7, characterized in that it can be wound onto the metallic outer tube ( 30 ) of a spring shaft and that the current band ( 22 ) in firm, permanent, electrically conductive connection with this outer tube ( 30 ) stands. 9. roller shutter curtain ( 12 ) according to claim 8, characterized in that the outer tube ( 30 ) of a spring shaft and the inner tube ( 44 ) of the same spring shaft by a conductor helix ( 34 ) are permanently connected in an electrically conductive manner. 10. Roller shutter curtain ( 12 ) according to claim 9, characterized in that the conductor helix ( 34 ) inside the outer tube ( 30 ) of a spring shaft, in the space between the coil spring ( 34 ) is guided, the coil spring ( 54 ) from the inner tube ( 44 ) is reached. 11. Roller shutter (12) according to claim 10, characterized in that the inner tube (44) of a spring shaft in insoluble, electrically conductive connection to the bearing pin (46) and this bearing pin (46) has a connection possibility for electrical connection to a grounding conductor system .