DE3448023A1 - Clamping device for sheets, in particular for large-size sheets of paper - Google Patents

Abstract

A clamping device for sheets, in particular for large-size sheets of paper, is to be constructed in such a way that sheets can be fixed durably with one hand and can be removed easily, in which case no special requirements have to be placed on the quality of the paper and the risk of tearing out and increased stock-keeping can be avoided. This object is achieved in that at least one spring element (4) is inserted under pressure between a limb (3) of the holding profile (1) and the edge of the baseplate (2), and the upper edge of the baseplate (2) is inserted in the open side of the holding profile (1), while the other sides of the baseplate (2) are enclosed by U-shaped frame profiles, and the baseplate is pressed into said frame profiles with at least one elastic element, said elastic element having a steeper spring characteristic compared to the spring element (4). <IMAGE>

Description

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Clamping device for foils, in particular for large-format paper foils

The invention relates to a clamping device for foils, in particular for large-format paper foils, consisting of a base plate, at least one at the upper end of the base plate arranged retaining profile and spring elements ^ by means of which the film can be pressed against the base plate, as a retaining profile a U-profile is used, in 'whose open .side a Edge of the base plate is inserted.

Such a clamping device is already known from US Pat. No. 2,814,138 known. With such paper fastenings, the springs either act directly on the paper from the outside or via profiles, which are hinged to the edge of the base plate by hinge pins, Flat springs, torsion springs or profiles formed from resilient material. There is the disadvantage that Use both hands, especially with large paper formats must be in order to push the paper into the correct position on the one hand and a spring force acting on the paper on the other hand to be lifted, for example, by lifting a flap or triggering a catch. The film can slip easily here or lift off the edge of the system in windy conditions.

In the case of other known externally acting spring forces with externally rounded clamping devices, the Disadvantage that the spring force must remain very weak in order to be able to insert the paper without spring relief. The disadvantage can only be circumvented if the paper has a greater hardness, strength and rigidity than is justifiable for economic reasons having.

For other clamping devices in which screws or nail tips are used, a pre-punching or at least there should be a marking in the foil. Apart from

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the increased risk of pulling out, especially in the case of moisture, there is also the disadvantage of larger stocks different types of paper from the suppliers.

The object of the present invention is to design a clamping device of the type mentioned in such a way that foils can be permanently fixed and easily removed with one hand, without the disadvantages mentioned in the prior art, such as special demands on the paper quality, risk of tearing or to have to accept increased storage.

According to the invention, this object is achieved by what is stated in the claims specified features solved. The clamping device according to the invention enables one-handed operation for the first time, the area covered by the clamping device itself is very small. Another advantage of the invention The clamping device is that it is kept very small in its dimensions and is therefore optically inconspicuous. i

In the following the invention is explained in more detail using an exemplary embodiment. Show it:

Fig. 1 = cross section through the retaining profile of the clamping device
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Fig. 2 = side view of a poster carrier, consisting of a retaining profile and frame profiles

3 = cross section through a frame profile 30

In FIG. 1, the holding profile 1 is shown with two nose arches 9a, 9b, between which the base plate 2 is clamped via a spring element 4 which is supported on the leg 3 of the holding profile 1. The base plate 2 is preferably slightly elastic and non-adhesive, for example made of acrylic. The spring element used is preferably a flat steel spring that is bent in a wave shape and whose spring characteristic is matched in this way ^! is that a compression without strong deflection of the

elastic base plate is possible.

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Should a slide, for example a large-format paper, are clamped in the retaining bar, the film is first placed on the base of the plate 2 and the film is guided with light pressure against the base plate between base plate and leg 13. After relieving the flat steel spring 4 the film is clamped between the nasal arch 9a and the base plate 2, any overhangs in the storage space 12 being taken up can be.

According to Fig. 2, the holding profile 1 is with frame profiles 5, 6.7 firmly connected to a poster carrier. The spring elements 4a, 4b are housed in the retaining profile 1, while a frame Hose profile 8 is inserted. This tubular profile 8 ends preferably 8 to 12 cm in front of the upper frame corners. The frame profiles 5, 6, 7 are U-shaped and reach over the edge of the base plate 2.

According to Fig. 3, a preferred frame profile is C-shaped. In the upper part of the C-arm 14, the hose profile 8 is arranged, which the base plate 2 against stop surfaces 15, of the lower C-arm presses.

It is advantageous that the lugs of the holding or frame profile 1, 5, 6, 7 have lugs between the legs, which have a rounding for better introduction of the paper or the film and at the same time form an edge that the seat of the spring elements guaranteed. Ventilation slots and weather protection rails can also be accommodated in the profiles, which prevent rainwater from penetrating through lateral drainage. When installing the clamping profile according to the invention in a showcase cabinet, the profiles can be arranged in the manner of a labyrinth, so that a waterproofing is guaranteed with simultaneous ventilation of the showcase interior. This ventilation is important because the temperature fluctuations often cause condensation to form, which can then evaporate through appropriate convection. In addition, a build-up of heat in electrical lighting must be avoided. r * r \ n \ * ^

Claims (6)

At the 23rd OS 1985 MW / ka. Annex II 3445 02 claims: 1. Clamping device for foils, especially for large format ones Paper foils, consisting of a base plate, at least one at the upper end of the base plate arranged retaining profile and spring elements, by means of which the film can be pressed against the base plate is, whereby a U-profile is used as a retaining profile, in the open side of which an edge is used the base plate is inserted, characterized in that between one leg (3) of the retaining profile (1) and the edge of the base plate (2) at least one spring element (4) inserted under pressure is and the upper edge of the base plate (2) in the ι the open side of the retaining profile (1) 'is pushed in, while the other sides of the base plate (2) of f U-shaped frame profiles (5, 6, 7) are enclosed, and the base plate is pressed into these frame profiles with at least one elastic element, the elastic element having a spring characteristic curve that is steeper than that of the spring element (4). 2. Clamping device according to claim 1, characterized in that in the junction between the holding profile (1) and frame profiles (5, 6) a free space is formed without elastic spring elements. 3. Clamping device according to one of the preceding claims, characterized in that the inside of the legs U-shaped profiles have a nasal thickening in cross section, the nasal arch (9) at the open End of the profile. 4. Clamping device according to one of the preceding claims, characterized in that the U-profiles (1, 5, 6, 7) within a showcase construction as a closed Frame are executed, with ventilation slots and gutters arranged in the area of the upper retaining profile are. 5. Clamping device according to one of the preceding claims, characterized in that the U-profile frame, consisting is formed from the individual profiles (1, 5, 6, 7) as a swing-out poster carrier. 6. Clamping device according to one of the preceding claims, characterized in that the swing-out poster carrier is secured in a locking profile which has an invisible lock accessible from below.