DE102017009628A1 - tenter - Google Patents

Abstract

The invention relates to a tension frame (10) for an insect screen with a frame (12) and in particular with a frame (12) attachable net (14), wherein the frame (12) consists of a plurality of rods (16) at corners ( 18) are connected to each other, in particular cohesively merge into each other. It is suggested that the frame (12) is made by bending.

Description

The invention relates to a tenter frame for insect protection with a frame and in particular with a frame attachable to the network.

State of the art

With the DE 202013003007 U1 Such a clamping frame has become known which can be installed in a window. The clamping frame rests on all sides of the window frame and is supported on this.

Disclosure of the invention

Advantages of the invention

The clamping frame according to the invention, which consists of a frame with a plurality of bars, which are connected to each other at corners, in particular merge into each other, is characterized in that the frame is made by bending. Although such a frame produced by bending has the disadvantage that in each case a separate frame must be produced for all different sizes, since resizing is as good as not possible. However, the invention is based on the finding that a frame produced by bending can be produced quickly and inexpensively and is significantly more stable than a composite frame. In addition, a frame made by bending may be provided with its inherent tension inherent in the construction. Composite frames usually need to be secured with separate fasteners in or on the window. Only by this special production of this captivating by its simplicity tenter can build the desired stability and elasticity.

The features listed in the dependent claims advantageous refinements of the clamping frame according to the main claim are possible. So it has proved to be particularly advantageous to produce the frame by a 3-roll bending process. With this method, the desired corners can be created quickly and easily in any position in a continuous process. On the base material of the frame while defined forces acting at the corners of the frame stretch or compress and thus produce a certain stiffening, which increase the stability of the frame.

It has proved to be particularly advantageous if the frame is produced by means of a 4-roll bending process. By this method, the corners of the frame are pre-bent more to be bent over the fourth role back to the actual bending angle. As a result, a relaxation occurs, which allows the so-called "memory effect of the material" largely off. The once curved shape is retained over years. Instead of rollers, one or more supports can be provided, over which the frame material to be bent is guided.

Particularly cost-effective, the frame can be produced if it consists of a rotating wire. The wire can be unrolled from a reel, directed and then fed to the bending machines. The frame is then made in one pass and cut to size.

To close the frame, it has proven to be advantageous if the ends are soldered or butt welded together.

From the large number of possible wire cross-sections, it has proved to be particularly advantageous if the wire or the rods has a diameter between 2.5 mm and 6.5 mm. Within these strengths, it is also possible to produce oversized and very small frames. If a diameter between 3 mm and 5 mm is selected, all common frame sizes can be covered. A wire diameter of 4 mm is to be preferred because with this strength 70 - 80 % of all frame size can be produced. By choosing this thickness almost all frames can be made, whereby it is not necessary to change the wire in the manufacturing process.

This leads to faster turnaround times and cost-effective production.

Stable frames can be made if the diameter of the frame is selected to be the average ratio of the length of the bars of the frame to the diameter between the values 130 and 320 lies. The effective wire diameter can then be calculated as the average of the two extreme values of the interval.

The frame is preferably made of a chromium-nickel steel having a chromium content of between 16% and 19% and a nickel content of between 6% and 10%. From the amount of possible types of steel this steel could be found, which does not rust on the one hand and on the other hand is suitable to be bent accordingly. He can still build up the necessary voltage and hold it for a long time.

If the surface of the frame has a surface roughness (Ra) between 0.5 and 5 microns, the net can easily be threaded on and still get relative to the frame the necessary support for later use. A correspondingly smooth Surface additionally causes a certain corrosion protection.

The invention also relates to a tensioning frame for an insect screen with a frame and a net attached to the frame, wherein the frame consists of a plurality of rods which are connected to each other at corners, in particular merge into one another. The clamping frame is characterized in that the network has an extension. This simple measure makes it possible to simply remove the frame once inserted again.

In a preferred embodiment, the extension is integrally connected to the network.

list of figures

• It show the 1 a tenter according to the invention, the 2 schematically a bending process with a 3-roll process and the 4 a bending process with a 4-roll process.

description

In 1 is a tenter 10 for an insect screen with a frame 12 and with one on the frame 12 attachable network 14 shown.

Because both the frame 12 as well as the network 14 sold separately, the invention also extends to the frame 12 and the network 14 each for themselves.

The frame 12 consists of several bars 16 at their corners 18 connected to each other. The frame 12 of the embodiment consists of four rods 14 , At their ends are the bars 14 over corners 18 connected with each other. In the embodiment, the rods 16 Fabric conclusively over the corners 18 connected with each other. That is, a continuous wire 22 both the bars 16 as well as the corners 18 forms.

(d=Drahtdurchmesser in mm, r=Radius der Ecken in mm) liegt. Dem Fachmann ist klar, dass mit kleineren Drahtdurchmesser auch kleinere Radien 20 für die Ecken 18 möglich sind. Kleine Radien 20 der Ecken 18 haben den Vorteil, dass sie sich eng und passgenau in einen Fensterrahmen einfügen lassen.The corners have a radius 20 on, which can be between 2 mm and 10 mm. In the exemplary embodiment, the radius is 5 mm. The size of the radius 20 depends on the wire thickness and can be selected from an interval whose lower limit is 2 mm smaller than the wire diameter and whose upper limit is 6 mm larger than the wire diameter. It follows that the radius 20 the corners 18 in the interval $$\text{d}-2\text{mm <r <d}+6\text{mm}$$

(d = wire diameter in mm, r = radius of the corners in mm). The skilled person is clear that with smaller wire diameter and smaller radii 20 for the corners 18 possible are. Small radii 20 the corners 18 have the advantage that they fit tightly and accurately into a window frame.

Larger radii 20 have the advantage of being the frame 12 is more stable. This is another reason why smaller wire diameters might be a slightly larger radius 20 for the corners 18 to choose. If one stays within the aforementioned interval one obtains tenter frames 10 with a very good stability, which can still be easily fit into window frames.

The frame 12 is produced in the embodiment by a 3-roll bending process. Such a method is in 2 shown. This is a wire 22 , which is usually rolled up on a reel, unrolled, straightened and then fed to a bending machine. The bending machine has three rollers 24 . 26 . 28 which the wire meets in turn. The roles 24 to 28 are arranged so that they are on the wire 22 alternately, lie opposite one another. The wire 22 can do so through the roles 24 to 28 be guided until it comes to a position in which a planned corner 18 within the roles 24 to 28 arrives. At this point, while the wire is going 22 is still transported, the middle role 26 in the direction of the two outer rollers 24 and 28 emotional. That is, she pushes herself into the wire 22 into it, which is bent by it.

The radius 20 the planned corner 18 is determined by the speed of the wire 22 , the speed of the role 26 and through the hub 30 the middle roll 26 set. It is clear to the person skilled in the art that the diameter of the bending rollers 24 to 28 must be smaller than the planned radius 20 ,

In the bending process is next to the radius 20 also the angle 32 set the respective bars 16 take each other. As a rule, the angle is 32 located in the range of 90 °. However, it is also possible, according to the place of use and the shape of the window other angles 32 provided.

In 3 shows a 4-roll bending process, which is exploited around a corner 18 to create. In principle, the 4-roll bending process differs from the aforementioned and illustrated 3-roll bending process in that a fourth roll 34 after the three roles 24 to 28 is provided, which is on the side of the middle roll 24 located. Like the middle role 24 is also the fourth role 34 movable and settles in the direction of the wire 22 move.

In contrast to the 3-roll bending process, the 4-roll bending process uses the radius 20 through the roles 24 to 28 more prone than planned, then through the fourth role 34 to be bent back so far that the planned radius 20 established. By this stronger forward and backward turn the wire 22 biased and calmed down a bit, leaving the corner 18 over a very long period both radius 20 as well as angles 32 comply.

Both the middle role 26 as well as the fourth role 34 are numerically controlled movable. About a suitable control are in this way frame 12 different size with adjusted radii 20 producible on these bending machines. This is an advantage of the tenter frame according to the invention 10 because a frame can be ordered and produced individually by the customer. It is not necessary to the frame 12 to build together on site.

The angles 32 lie in the embodiment, a tenter 10 for a rectangular window shows, at 93 °.

The angle 32 is preferably set to a value greater than 90 ° to a slightly convex profile of the rods 16 to reach. This allows the tenter 10 be applied to the outer edges within the window frame under tension. The angles 32 are set to values between 90.5 ° and 97 °. If the value is chosen too small, ie less than 90.5 °, it may happen that in a mass production and the associated manufacturing tolerances an angle 32 produced at 90 °, which is an inwardly bent rod 16 would produce. A frame 12 with one or more inwardly bent bars 16 can not invest in the inner window frame when installed in a window under tension.

It has been shown that angle 32 greater than 97 ° to frame 12 lead, whose wire ends no longer assign each other. These frames are then more difficult to manufacture.

The frame 12 consists in the embodiment of a rotating wire 22 , This has the advantage of being the frame 12 has and maintains an internal stability.

At one, not shown in the figure position, the two wire ends are connected together. In the embodiment, the two ends are butt welded together. This is very easy by resistance welding possible. However, it is also possible to use ultrasonic welding. The wires can also be soldered together.

If the wire connection to be solvable later, preferably a sleeve is used, which is slipped over the wire ends and either pinched or clamped by screwing.

In the embodiment, the wire 22 a diameter of 4 mm. With this wire diameter, most and most common frame sizes can be made with suitable stability.

For larger windows and, consequently, larger clamping frames 10 Also larger wire diameters up to 5 mm, in extreme cases up to 6.5 mm can be used. For smaller windows, on the other hand, wire diameters of up to 3 mm are suitable, in extreme cases up to 2.5 mm.

(l= Länge eines Stabs 16 in mm, d= Durchmesser des Draht 22 in mm)It has been shown that frame 12 with particularly good stability can be produced if it lies in the following interval: $$130<\text{I / d <320}$$

(l = length of a staff 16 in mm, d = diameter of the wire 22 in mm)

• d = 850 mm / 320 = 2,7 mm und
• d = 850 mm / 130 = 6,5 mm

For a frame with a length of 1000 mm and a width of 700 mm, the average length l = (1000 mm + 700 mm) / 2 = 850. The result then for the wire diameter d is the interval:

• d = 850 mm / 320 = 2.7 mm and
• d = 850 mm / 130 = 6.5 mm

The mean value is calculated as d = (2.7 mm + 6.5 mm) / 2 = 4.6 mm. With a wire diameter of 4 mm it is well in the interval and is a stable frame 12 can provide. This calculation is to be understood approximately, as recognizable the corners are not deducted from the frame size.

In the embodiment, there is the frame 12 from a chromium-nickel steel, with the chromium content of 18% and the nickel content of 8%. It has been found necessary to choose from the large number of possible steel and iron grades a steel which, on the one hand, is bendable, which, on the other hand, holds the tension and, moreover, should not rust over its service life. These requirements can be met if the chromium content is selected between 16% and 19% and the nickel content between 6% and 10%.

Furthermore, it is advantageous if the wire consists of a spring steel of the highest hardness.

The invention is further based on the knowledge that the surface of the frame 12 a significant impact on the manufacturability of the finished tenter with the network 14 and whose later durability applies. For the production of the clamping frame, the surface should be as smooth as possible, so that the net 14 easily over the bars 16 can be pushed. In addition, a smooth, in the extreme case polished surface, a corrosion of the frame acts 12 opposite.

In later use, however, it is advantageous if the network 14 little relative to the frame 12 moved so as to scour or scour the net 14 to prevent on a window frame. It has been shown that this is achieved when the surface roughness (Ra) is between 0.5 μm and 5 μm. In the exemplary embodiment, the roughness depth was set to 3 microns. The roughness depth is already set during manufacture of the wire or during subsequent finishing. The wire is usually drawn or rolled through a die during manufacture. The choice and quality of the production tools affects the roughness. Subsequent processes, such as those used in surface hardening, also influence the roughness depth.

The finished tenter frame 10 consists of a frame according to the invention 12 and one on the frame 12 attached network 14 , where the frame 12 from several bars 16 that exists at their corners 18 connected to each other.

The network 14 has at least one extension 36 on. About this extension 36 can the tenter 10 Simply put in a window frame and removed again.

The extension 36 is integral with the net 14 connected. When installed, it is like a small extension or a small loop 38 from.

It is also possible the extension 36 in the form of a narrow band, which in the installed state on the frame 12 extends along and does not protrude into the field of view.

For producing a tenter 10 becomes a wire 22 after being straightened, fed to a three or four roller bender and bent and cut to length according to the values previously entered in a sequence program. This creates the frame 12 with the wire ends facing each other.

The network 14 , which is stretchable in two dimensions, is cut to size, folded over at its long sides and sewn at a distance, making a seam 40 and a loop area 42 arises. At one point the loop area becomes 42 left open. There is also an extension 36 on the net 14 educated.

An alternative network 14 is essentially stretchy in one direction only. The reason for this lies in the production of the net, which can be knitted or knitted with different stitches. Such a substantially stretchable net in one direction 14 is cut and sutured so that the direction in which it can be stretched is diagonal to the corners. In this way, the stretchability can be exploited at least partially in the length and width directions.

The prepared network 14 gets over the open spot in the loop area 42 in the area of the wire ends on the wire 22 so postponed that the wire 22 or the bars 16 in the loop area 42 to come to rest. The size of the prepared network 14 is chosen so that the net 14 as part of 12 energized. This will be the net 14 prepared so that it is between 1.5% and 5% smaller in the finished state than the frame 12 , In the embodiment, the network 14 3% smaller than the frame 12 ,

After the net 14 on the frame 12 is threaded, the wire ends are welded together by resistance welding butt. The opening of the loop area 42 must therefore be chosen so large that the network 14 can be kept away from the hot areas during the welding process.

Alternatively, a sleeve made of metal or plastic can be pushed over the wire ends and clamped or glued.

In an alternative embodiment, the frame becomes 12 finished bent and its ends joined together. Then the network becomes 14 so sewn that the rods 16 from the network 14 are enclosed. This will be the net 14 inside the frame 12 so stretched or stretched that the outer circumference of the net 14 around the bars 16 can be beaten and squeezed around.

In another embodiment, the bars are 16 or is the wire 22 sheathed, especially with a plastic, which is then connected to the net 14 glued or verschscheißt.

The prepared clamping frame 10 is introduced into the window inside an open window, in which its elasticity is utilized. The opposite bars 16 are moved toward each other and put into the window frame. Become the bars 16 let go, the tenter lays down 10 on the inside of the window frame.

To the tenter frame 10 to remove from the open window is on the extension 36 or. the loop 38 a force is applied by hand to the center of the window, so that the rod 16 bends in this area, gripped by hand and the entire clamping frame can be removed from the window.

It is clear to the person skilled in the art that the variables mentioned here are based on the usual tolerances that result in manufacturing processes.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202013003007 U1 [0002]

Claims (10)

Tenter frame (10) for insect protection with a frame (12) and in particular with a frame (12) attachable net (14), wherein the frame (12) consists of a plurality of bars (16) connected to each other at corners (18) are, in particular cohesively merge into each other, characterized in that the frame (12) is made by bending. Tensioning frame (10) after Claim 1 , characterized in that the frame (12) is made by means of a 3-roll bending process or by means of a 4-roll bending process. Clamping frame (10) according to one of the preceding claims, characterized in that the frame (12) consists of a rotating wire (22). Clamping frame (10) according to one of the preceding claims, characterized in that the wire (22) is soldered or butt welded at its ends. Clamping frame (10) according to any one of the preceding claims, characterized in that the wire (22) or the rods (16) has a diameter between 2, 5 mm and 6.5 mm, in particular between 3 mm and 5 mm, preferably 4 mm or have. Tentering frame (10) according to one of the preceding claims, characterized in that the diameter (d) of the wire (22) is selected such that the average ratio of the lengths (l) of the bars (16) of the frame (12) to the diameter (d) is between 130 and 320. Clamping frame (10) according to any one of the preceding claims, characterized in that the frame (12) consists of a chromium-nickel steel with a chromium content between 16% and 19% and a nickel content between 6% and 10%. Clamping frame (10) according to any one of the preceding claims, characterized in that the surface of the frame (12) has a roughness (Ra) between 0.5 and 5 microns. Tentering frame (10) for insect protection comprising a frame (12) and a net (14) fixed to the frame (12), the frame (12) consisting of a plurality of rods (16) connected together at corners (18), in particular cohesively merge into each other, in particular according to one of the preceding claims, characterized in that the network (14) has an extension (36, 38). Clamping frame (10) according to one of the preceding claims, characterized in that the extension (36, 38) is integrally connected to the net (14).

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