DE69821723T2 - screen structure - Google Patents

Abstract

Screen structure, comprising at least two guides (25,26) for accommodating between them an end member (8) to which a screen (1) is attached, which screen (1), at the other end, can be rolled up onto a drum (5). The guide comprises straight parts (25,26) and a hinge joint (27) which is arranged between them. The hinge joint (27) comprises a central shell part and two adjoining side shell parts. These side shell parts execute a controlled movement with respect to the central shell part. <IMAGE>

Description

The The present invention relates to a shield structure according to the preamble of Claim 1.

A such a shielding structure is generally known and is e.g. B. in the European application 0.608.720 shown. In this document, the swivel part includes a individual part, which in the area of the ends with hinge openings for receiving is provided by hinge bolts that are on the other side rotate in the straight parts of the shield structure. Even though a structure of this kind is simple, it has the disadvantage that a significant gap between the hinge and the adjacent rectilinear parts remains in the tilt position. Such is impossible Avoid gaps because of the angle between the two straight lines Parts differ significantly in many applications. On Another significant disadvantage is that it is necessary after the straight parts to length were cut, the corresponding openings for receiving the pins, by means of which the swivel part is fastened to form therein. The Position these openings required because of the leadership of the belt in front of the front bar or the end element a very high accuracy. On Straps of this type are required to ensure that the Shielding fabric is taut in any position. Besides, is it is necessary to make a cover cap at any angle is different.

The European Registration 0.609.487 shows an articulated hinge between two straight parts and a large number of separate parts includes. There is a limited shift between each of these parts possible in the angular direction. At least six swivel parts of this type are required to one Angle of 90 ° to achieve what makes the corner joint expensive and the radius of curvature increased.

Even though this design creates protection between adjacent parts, will solve the problem of assembly difficulties described above the size Number of swivel parts increased even further. In addition, the number of swivel parts changes as a function of the angle that needs to be bridged so that the Swivel parts in the unfolded position are always positioned in this way are that they are firmly against each other (on the underside). The means that it is necessary to decide at the production site how many of the so-called arch elements are required to make one certain angle to bridge what makes the structure even more complicated.

The The object of the present invention is to overcome the disadvantages mentioned above to avoid and to create an improved shielding structure.

This Task is in the case of a shielding structure as described above is solved by means of the characterizing features according to claim 1. In this Case it is for the external protection of the middle housing part possible, that it is designed in such a way that the side case is housed in it are, however, the opposite can also be true, in which Fall the side housing parts are provided with receiving parts (one of the side housing parts is provided with receiving parts) to the central housing part to record in them. The side housing parts according to the invention can about that central housing part an angle of at least 45 ° in Form reference to each other, this angle in particular a maximum of has about 90 °, so that any angular position between 0 ° and 90 ° is possible. The connection between the side housing parts, which is preferably mechanical, ensures that the movement of the middle housing part always done evenly. This represents a smooth movement the guides, that are opposite each other in terms of shielding, sure d. that is, the front bar places the same on both sides Way back, so that it cannot tilt and jam. This stands in contrast to the structure described in European application 0.609.487 is described, in which each shift in the angular direction to a uncontrolled type takes place, which is recognizable on site difficult.

According to one advantageous embodiment of the Invention protective caps are provided, so that in the swivel part arranged parts in any position of the pivot part, for. B. between 0 ° and 90 °, always completely covered are. This means that the inside of the swivel part is not from the outside can be seen and that this interior is protected from external influences. The inside of the swivel part contains generally two receiving parts for the belt that holds the drum, around which the shield is rolled up and connects the end element. Moreover it is necessary to create a guide for the end element in the swivel part.

The mechanical connection between the two side housing parts can be carried out either directly or via the central housing part. In the case of direct coupling, these side housing parts can e.g. B. each be provided with a set of teeth, the sets of teeth coming into engagement with each other. It is also possible to use a lever system or other rod systems to connect the two side housing parts. After the insight regarding the connection of the two side housing parts was reached en, the design of such a connection is obvious to those skilled in the art.

If it an elbow in the guide rails for one Shielding there, it is necessary that the shielding on the Point of the contra-angle is supported, otherwise the shield "cuts" the elbow. For proposes this purpose the prior art support rods. According to one particularly practical design of the invention, it is possible to support staff of this type on the central housing part of the swivel part according to the invention to fix. It has been determined that this causes the path of the fabric the path of the neighboring guide rails for the front bar or for the end element essentially corresponds.

There the effective diameter of the fabric roll depends on of length of the shield that is being rolled, and since it is necessary the shield between the roller and the end element taut hold, it is common in the prior art, a spring structure in to record the end element, the spring structure by means of the above described belt maintains tension in the shield.

It it was found that this spring tension is particularly difficult optimally set. This is because after this spring tension the various parts have been assembled, in general must be set on site, taking the conditions out of this Reason, of course are not optimal.

in the In general it is desirable to achieve a fabric tension as high as in the open position possible is what makes spring tension adjustment even more important.

in the In the prior art, linear coil springs are used, which cause that the tension in the fabric increases as the surface content increases the fabric is enlarged, d. i.e. while the shield opened further becomes. Gas springs are also used.

There the shields in many lengths and widths are supplied, it is important to use a spring system use that as short as possible is, so the minimum length of the end element that can be delivered is as short as possible. On the other hand, requires a stronger one Feather (which is desirable is to make the fabric tighter) a longer length.

Obviously Is it possible, such spring systems not only in the end element, but also on other positions. However, the end element is comparative long and offers considerable space for the inclusion of a spring system. A spring system in the side guide would Make the latter bigger, what for the sake of Appearance undesirable is. After the different guide rails attached and the various components assembled the spring is determined by the mechanics in accordance with prescribed regulations on site. If when doing this work If mistakes are made, the shield will not work or will work they are insufficient, though the shield structure is damaged can be. Therefore, the setting is usually made in the Way that there is a wide margin. Hence only a limited Part of the spring span used effectively, which leads to a spring system that either longer or is flaccid than required, or both. The spring systems of this kind can in leadership, arranged in the end element or in the holder for the fabric roll his.

The The object of the present invention is to avoid this disadvantage. This task is done in the case of a shielding structure like the one above is described, solved, by designing the balance spring structure so that if one first movement of that end of the spring structure that with the strap connected to a tension of the belt, the one exerted by the spring structure Drag is comparatively low, while drag on one certain point of expansion of the belt (the discontinuity point) suddenly rises to a comparatively high level. If the shield all variables are selected in such a way that this point of discontinuity Moreover the optimal setting point for the shield in question is. Obviously, it's an alternative to a belt as well possible, a chain, a rope and the like for connecting the fabric roll to use with the end element. In addition, it goes without saying that the compensation spring structure described here also a shield without the pivot part described above can be.

The The structure described above makes it special for a machinist easy to properly tension the strap on site as there is a clear transition between the comparatively low spring force and the fast rising, higher Spring force there. The point of discontinuity is for a machinist particularly easy to determine, the manufacturer only the Prescribes position at which the end element at the moment of tensioning lies.

If desired, it is still possible during the first part of the shielding path to choose a comparatively low voltage. The tension increases and only brings the fabric to the desired level of tightness from the desired moment.

A Spring balancing structure of this type can easily be made with two springs, with a comparatively weak spring and with a comparatively strong one Spring, executed become. While the first part of the process of unrolling the fabric only the first, weaker Spring active, and during of the second part comes the stronger one Pen for effect. If desired, the spring characteristic can be progressive be made. This choice is made by the producer through the Choose the roll diameter, the fabric thickness, the belt thickness and the diameter the roll of fabric hit. In all cases, those of the machine fitter remain carried out on site operations the same.

The Invention will be described in more detail below based on an exemplary embodiment explains the is illustrated in the drawing, in which:

1 a perspective view of part of a shield according to the invention, which is provided with a pivoting part, partly in section;

2 shows a side view of a detail of the pivoting part;

3 shows a perspective view of the balance spring structure;

4 shows a graphical representation of the force curve of the balance spring structure; and

5 the voltage curve of the shield when it is open (extended) shows.

1 shows a shield structure that a shield (fabric) 1 includes. This can be on a roll of fabric 2 that on a drum 5 is arranged using a motor 34 can be operated, which is only shown graphically, rolled up and unrolled from this. The shield 1 is between the fabric roll 2 and the front bar or the end element 8th curious; excited. This front bar 8th is attached to the sides in the guide rails and comprises a closed, preferably extruded section. The drawing shows only one side of this structure. In the present exemplary embodiment, the guide comprises two rectilinear guide rails 25 and 26 and a pivot point 27 that is placed between them. The front bar 8th can by the guides arranged in it from a position in which they are essentially on the fabric roll 2 rests up to the free end of the straight guide part 26 be moved.

So that the fabric can be tensioned optimally, there is a strap 4 present, moving away from the drum 5 over the pulley 15 to the front bar 8th extends and to the role 35 can be rolled up and unrolled from it. To keep the voltage of the shield at the desired level, the front panel contains 8th a balance spring structure, the details of which 3 emerge.

Since it is often desirable to locate one or more elbows on the path of the shield to the rolled position, is a pivoting part 27 between the two straight parts 25 and 26 arranged. This swivel part 27 whose details are out 2 can be seen, includes two side housing parts 28 and 30 , between which a central housing part 29 is arranged. Out 2 it can also be seen that the side housing parts 28 and 30 with protruding bezels 16 are provided, which are curved in shape and by interacting with the projecting part 22 separate the space enclosed by the housing parts in each position from the central housing part. The space in the top in 2 is included, on the one hand, the movement of the end of the front bar 8th and on the other hand take up the strap with which this bar is attached. The end of the front bar 8th can e.g. B. be designed as a sled with wheels (cf. 3 ) is provided. The sector that is in a lower level and with 14 is used for the return of the belt 4 used. Out 2 it can be seen that the housing part 29 with a receiving part 18 to accommodate a storage unit 40 for the support staff 19 , over which the shield is bent, is provided. The lower sector 14 is with a cover 32 provided which the bearing assembly 40 hides. Each of the side housing parts has a projecting part 31 provided that in a correspondingly shaped chamber in the straight parts 25 . 26 can be included.

The swivel part 27 is supplied as a ready-to-use structure. The user only needs the straight parts 26 and 25 by fitting the protruding parts 31 in the corresponding chambers in the straight parts 25 and 26 connect with each other. The side housing parts 28 and 30 are on the underside with protruding edges 21 Mistake. These edges work with the protruding edge 36 of the central housing part and ensure that the underside is completely covered in every position, ie the contents of the housing parts are not visible and are protected from the effects of the weather. The side housing parts 28 and 30 are using the gearing 17 coupled. The side housing part le 28 and 30 pivot over the "low position" hinges 20 around the central part of the housing 29 , It has been determined that a structure of this type ensures that the angle between each side housing part 28 respectively. 30 and the central housing part is always the same in both side housing parts. As a result of the fact that the two arms, which are the guide for the front bar 8th create, with the structure according to the invention in the same way to perform an angular movement, it is ensured that the path in the angular direction is constant, so that both the belt 4 , which extends therein, as well as any slides that move over the angle, can easily pass through the angle piece in question.

The tabs 37 are in place to provide optimal guidance for the retracting part of the belt 4 to accomplish. The corresponding projections 38 . 39 are in place around the entering part of the belt 4 respectively.

The Swivel part described above makes it easy to get any desired angular position adjust. Any angle between 90 ° and 180 ° can be done in a simple way accomplished become. Because a number of swivel parts as described above positioned one after the other, it is possible to create any desired curvature, e.g. B. for domes, Halls and the like.

The inside of the spring system holder, e.g. B. the front bar 8th , is based on the 3 described. In the section, which is preferably closed, there is a spring balancing device for sagging the front bar 8th to prevent.

The Spring compensation device can also be found in the side guides or in a holding case are located.

The strap 4 whose end is at 40 attached to the front bar is in front of the bar 8th , The strap 4 runs over a spring wheel 11 towards the guidance system for the shield. The spring wheel 11 is by the feathers 9 and 10 that at the other end on the front bar 8th are supported, kept in a prestressed state. The spring wheel 11 is in the section of the front bar 8th guided, engages by means of two flanges around a thickened part of the section, so that the belt 4 is trapped and cannot come off the wheel. Of course, the spring tension in the system is determined by setting the length of the belt, ie the position of the belt, at 40 attached, determined.

It is common in the prior art to use a linear coil spring for the spring 9 to use. In this case, it is necessary to adjust this spring in such a way that the shield is under a certain tension under all conditions, while as the length of the belt decreases, the force exerted on the shield increases in a linear manner. The feather 10 is preferably a pneumatic spring. Since all components are only assembled on site, this spring tension is of course also fixed on site. It has been found in practice that this poses significant problems.

According to the invention, a spring is proposed 9 with the in 4 to create the characteristic curve shown, ie, during the first part of the compression, this compression can be carried out with a force which increases comparatively little. Then the point of discontinuity is reached, after which the spring force increases very quickly, whereupon it returns to a gradual further increase. A combination of this type can e.g. B. with two springs 9 . 10 , ie with a comparatively slack spring and with a comparatively strong spring that follows. Those skilled in the art can also devise other combinations of either special springs or tensioned springs. Using a spring structure of this type enables the machinist to tension the spring at a point defined by the manufacturer up to the point of discontinuity. This point of discontinuity is easy to feel. If this chucking is done correctly, the result is, provided the correct dimensioning of the remaining components is in 5 shown curve of the movement of the shield to the outside, the so-called extension. Since the spring structure can be optimized, it is possible to precisely determine its length, so that in most applications it is possible to have the spring structure in the front bar 8th take. The possibility given above to position the spring structure at different positions in the shielding structure is not excluded.

Also, with regard to 5 noted that this figure shows that the tension force decreases during the first part of the opening path of the shield and then increases. A property of this kind is particularly desirable in certain circumstances. Of course, the tension characteristic of the shielding fabric depends not only on the springs chosen, but also on the relationships between the roll diameter of the shielding fabric and the roll diameter of the belt and the thickness of the belt and the thickness of the shielding fabric.

Of course, the spring characteristic shown here can differ significantly from that in 4 distinguish the spring characteristic shown. The only we A significant feature is that the spring force is at a comparatively low level up to a certain load, the spring force thereafter at a defined point or within a specific, comparatively narrow range, whereby the machine fitter can tension the shield at the point or in the region , increases much faster. In the example shown, the pneumatic spring 10 used to achieve the desired effect. This is because the coil spring is comparatively limp and performs the first part of the movement, while the pneumatic spring connected in series takes effect from the point of discontinuity.

By precisely adjusting the roll diameter of the fabric roll and using a belt with the correct thickness and with a precisely predictable elevator behavior, it is possible to produce a shielding structure that, for any length, has the desired progressive behavior with the required fabric tension combined with minimal installation dimensions in the Spring system shows. The prerequisite is that the spring system is set precisely. By using a two-part spring system, it is only necessary to manually pull the belt until it reaches the point of discontinuity and hold it in position 40 fasten to achieve the correct adjustment of the spring system. It is also possible to achieve a regressive nature in the first part of the movement of the shield. In addition, due to the presence of the comparatively slack spring, it is possible to compensate for any creep in the fabric and / or in the belt. The invention makes it possible to choose a second, stronger pneumatic spring with exactly the required movement, so that the installation space is optimally used. The system does not encounter any problems such as belt breakage or engine overload. In addition, further adjustment mechanisms are unnecessary.

It goes without saying the invention has been described above with reference to the preferred embodiments. amendments on these embodiments, the scope of the attached Expectations are for obvious to those skilled in the art.

Claims (10)

Shielding structure that a shielding ( 1 ) and a drum ( 5 ), on which the shield can be rolled up, and at the free end, which is spaced from the drum, with an end element ( 8th ) is provided, the shielding structure comprising two spaced guide rails, which between them the end element ( 8th ), whereby each guide rail has at least two straight parts ( 25 . 26 ) and an articulated swivel part ( 27 ), which is located between them, the pivoting part ( 27 ) a central housing part ( 29 ) with two spaced pivot points ( 20 ) is provided, each of which is on a side housing part ( 28 . 30 ) is attached, each with a straight part ( 25 . 26 ), characterized in that the swivel part only the central housing part ( 29 ) and two side housing parts ( 28 . 30 ), the pivot points ( 20 ) of the central housing part are connected directly to the side housing parts, any shift in the angular direction between 0 ° and 90 ° between the side housing parts is possible, so that every angle between the straight parts in the range of 90 ° -180 ° bridges through the swivel part can be. A shield structure according to claim 1, wherein the side housing parts are mechanically connected to each other for a substantially smooth movement each side housing part in relation to the central part. Shielding structure according to one of the preceding claims, in which the lateral housing parts each have protective caps ( 16 . 21 ) which are designed to extend at least partially over the central part in the use position. Shielding structure according to one of the preceding claims, in which the central housing parts each have at least one protective cap ( 22 . 36 ) include. Shielding structure according to one of the preceding claims, in which each of the side housing parts is connected by connecting means ( 31 ) is provided, which it with the adjacent rectilinear part ( 25 . 26 ) connect. Shielding structure according to one of the preceding claims, wherein the central housing part with a fastening ( 32 ) for the inclusion of a support role ( 19 ) is provided. Shield structure according to one of the preceding claims, comprising a support role ( 19 ) comprising a bearing bush ( 14 ) in a recording part ( 18 ) of the central housing part ( 29 ) enclosed and by a cover fitting ( 32 ) is attached. Shielding structure according to one of the preceding claims, comprising a compensating spring structure and a belt, the spring structure on the one hand with the belt ( 4 ) connected to the drum ( 5 ) is connected, and on the other hand on part of the shielding structure is supported, wherein the compensating spring structure is such that when a first movement of that end of the spring structure which is connected to the belt is carried out with a tension of the belt against which the counterforce exerted by the spring structure is comparatively low, the counterforce suddenly rises to a comparatively high level at a certain point in the expansion of the belt, the discontinuity point. A shield structure according to claim 7, wherein the belt ( 4 ) through the balance spring structure via a wheel ( 11 ) is guided, which moves by means of its two flanges around two projections formed in the end element. Shield structure according to claim 8 or 9, wherein the compensating spring structure in the end element ( 8th ) is arranged, which has a closed section.