EP1731240B1 - Method for fabricating a gutter bracket produced from a wire-shaped material with round section and gutter bracket - Google Patents

Abstract

The method involves using a semi-finished product as a wire-shaped metal section having a round cross-section. The metal section is rolled in a w-shaped flat profile in a cross section of a gutter bracket (1), and the side grooves running in the longitudinal direction of the bracket are rolled-in. A middle groove (11) running in the longitudinal direction is rolled in the flat sides lying opposite to one another. An independent claim is also included for a gutter bracket for an eaves gutter, comprising a metal section.

Description

The invention relates to a method for producing a gutter holder for a gutter and a gutter holder produced by this method.

Channel holders are known both for arcuate curved as well as rectangular gutters. They each have a hook adapted to the cross section of the gutter and a hook connected in one piece with the support hook attachment portion. The attachment portion is provided with fixing holes, via which the carrying hook can be fixed to a rafter. The attachment portion can be bent to the support hook in the respective inclination of the roof rafter. The dimensions of commercially available gutter holders refer to gutters according to DIN 18461. DIN EN 1462 does not specify any detailed dimensions for gutter holders. However, certain functions have to be fulfilled. Gutters for gutters are classified in load bearing capacity classes, whereby gutter supports for high loads, for light loads and gutter supports for gutters with an upper opening width of less than 80 mm are distinguished. Gutter holders must be dimensioned so that the gutters intended for them can move freely within them. Gutters must not be lifted out by strong wind. Unless this is ensured by the shape of the gutter bracket, clips or springs should be provided to secure the gutter. Usually, a channel holder consists of a solid metal strip of dimensions 30 x 5 mm. Profiled gutter holder made of multi-folded metal strips are also state of the art ( EP 1 041 218 A2 ). By the DE 196 15 299 A1 It is also known to produce gutter holder from hollow tube blanks, For this purpose, the tube blank is at least partially provided with a groove or depression in order to increase the rigidity_of the gutter holder produced in this way. The pipe blanks do not necessarily have to be round from their cross section, but rectangular, square or even hexagonal pipe blanks are also suitable. The tube blanks can be replaced by a molding device, advantageously, a suitable roll forming device, pulled through and brought into the final contour.

From the IT-B-1 241 975 a method for the production of gutter holders by rollformtechnische reshaping a flat iron is known For stiffening the flat iron two longitudinally parallel grooves are introduced into the starting material.

The invention has for its object to provide an optimized gutter bracket, which is particularly economical to produce in terms of manufacturing costs and in terms of material usage.

This object is achieved by the manufacturing method having the features of patent claim 1. Advantageous embodiments are the subject of the respective dependent subclaims.

It is essential in the method according to the invention for producing a gutter holder that the starting material is not a metallic flat strip but a wire-shaped metal profile with a round cross-section. Preferably, a cold-rolled metal wire is used with a diameter of 20 mm. By appropriate profiling, that is, by the introduction of two extending in the longitudinal direction of the gutter holder side grooves, the metal material is subjected to work hardening, which compared to a standard holder with a rectangular cross-section allows a reduced use of material. In the case of a known holder profile which is rectangular in cross-section, for example, flat copper with the external dimensions 29 mm × 4.8 mm is used, whereas in the method according to the invention copper wire with a nominal diameter of 20 mm can be used. The channel holder made of a copper wire thus has a cross-sectional area of 91 mm ² compared to a cross-sectional area of 139.2 mm ² in a rectangular profile made of a metallic material thus a lower weight. The material savings in this exemplary comparison is approximately 34%. In addition, the strain hardening leads to a higher tensile strength of the gutter holder produced by the process according to the invention. While a cross-sectionally rectangular channel holder made of a copper material EN 1172 R240 has a tensile strength of 240 to 270 N / mm ² , this tensile strength would be increased in the geometry of the gutter bracket according to the invention to 300 to 400 N / mm ² , which attributed to the production process is.

Experiments have shown that a gutter holder produced by the process according to the invention can be used with all commercial bending tongs and does not bring any complaints in the processing, which is due to maintaining the profile external dimensions of 29 x 5 mm. Tests have also confirmed that the permanent deformation is less in the gutter holder produced by the method according to the invention than in the case of a solid profile.

The selected cross-sectional profile has a decisive influence on the load capacity of the gutter bracket. It is considered to be particularly useful if not only on one side of the flat profile are rolled two extending in the longitudinal direction of the gutter holder grooves, but also on the opposite flat side a center groove is provided. The W-shape of the flat profile results in this case by bilateral profiling of Flachprofis. In principle, however, it can be considered sufficient if at least one of the opposing flat sides is profiled, so that the desired W-shaped profile results solely from the side grooves. Another advantage is that in a groove holder profiled on only one side, the smooth flat side can be arranged on the side facing away from the gutter, so that the visual appearance does not change compared to known gutter holders.

A gutter holder produced by the method according to the invention is formed by rolling from a metal profile with a round cross-section to a cross-section with a substantially W-shaped flat profile. This W-shape is considered to be particularly favorable in terms of production since the two middle limbs of the W-shaped profile collide in the middle, where in the case of a wire-shaped metal profile the center of mass is already present, that is to say most of the material is present. Starting from the middle of the gutter bracket, the edge areas can then be rolled out, which are particularly resistant to bending due to the combination of side bars, side grooves and edge bars. Overall is Such a gutter holder very flat building at a height of about 5 mm. Due to the production-related work hardening he still has a sufficiently high modulus in the X and Y direction. Such a channel holder can be equipped with the conventional springs for attaching the gutters. Thus, the moments of resistance are as large as possible, the edge webs and the central web on the same height.

For manufacturing reasons, it is considered expedient if the adjacent to the central web groove flanks of the side grooves are made chamfered and ramp-like rise to the central web out. In addition to the side grooves may be formed on the side grooves facing away from the flat side a center groove in the region of the central web. This center groove may correspond in width to the width of the central web. The groove flanks of the center groove are preferably designed bevelled. In addition, if the pitch angle of the groove flanks of the center groove and the pitch angle of the groove flanks of the side groove are the same, results in the region of the groove flanks a substantially constant wall thickness, which may correspond in particular to the wall thickness in the region of the central web. In this case, a homogeneous material distribution is sought, in the sense that the wall thickness of the gutter holder is essentially constant over its entire width. Accordingly, the side grooves and the center groove may have the same depth.

As an alternative to the center groove, the opposite flat side of the flat profile can be smoothly rolled. This may be expedient for optical reasons, in particular if the smooth rolled side is the side facing away from the gutter. In principle, it is also possible to turn the smooth rolled or provided with the middle groove flat side of the gutter in the installation position.

The metal profile may consist of a steel material, copper or a copper alloy, aluminum or an aluminum alloy. The material may be surface-treated, in particular steel materials may be galvanized. The use of stainless steels is possible.

The metal profile can be used both for gutters for semicircular gutters and for gutters with box-shaped cross-section.

Figur 1

in der Seitenansicht einen Rinnenhalter für eine Dachrinne;

Figur 2

in vergrößertem Maßstab einen Querschnitt durch die Darstellung der Figur 1 entlang der Linie II-II und

Figur 3

entsprechend der Darstellung der Figur 2 eine alternative Querschnittsform.

The invention will be explained in more detail with reference to the embodiments illustrated in the schematic drawings. Show it:

FIG. 1

in side view, a gutter holder for a gutter;

FIG. 2

on a larger scale a cross section through the representation of FIG. 1 along the line II-II and

FIG. 3

according to the representation of FIG. 2 an alternative cross-sectional shape.

FIG. 1 shows in side view a channel holder 1 for a curved cross-section gutter. Both the gutter bracket 1 and the gutter not shown in this embodiment are made of copper. The channel holder 1 has an adapted to the cross-sectional contour of the gutter support hooks 2 and a straight mounting portion 3, which is bent according to the inclination of the roof, not shown relative to the support hooks 2. In the transition region of the support hook 2 on the mounting portion 3, an S-shaped configured clamping spring 4 is provided. At the free end of the support hook 2, a clamping spring 5 is also formed. The clamping springs 4, 5 serve to fix the inserted into the support hook 2 gutter.

FIG. 2 shows the profile of the gutter holder 1 produced by the method according to the invention in cross section. It can be seen that the profile is configured substantially W-shaped, wherein the entire cross-sectional contour is to be referred to as a flat profile. In this embodiment, the flat profile has a height H of 5 mm and a width B of 29 mm. This flat profile has an upper flat side 6, into which two side grooves 7 funnel-shaped in cross-section are introduced. The side grooves 7 are bounded by a central web 8 and edge edges 9 extending edge. On the opposite flat side 10 below the central web 8 a center groove 11 is rolled, which is wider than the side grooves 7. The width B1 of the central web 8 corresponds to the width of the center groove 11. The center groove 11 has in this embodiment has a slightly smaller depth than the Side grooves 7. At a depth of the side grooves of about 2 mm, the center groove 11 has a depth of about 1.5 mm.

FIG. 1 shows that the funnel-shaped side grooves 7 have obliquely rising groove flanks, with respect to the vertical, ie the central longitudinal plane MLE results in a pitch angle W1 of 30 °. The opening angle of the cross-sectionally symmetrical side grooves 7 is therefore 60 ° in this embodiment.

The pitch angle W2 of the center groove 11 with respect to the central longitudinal plane MLE is in this embodiment twice as large as the pitch angle W1 of the side grooves 7. This results in an opening angle W3 of 120 °. All outer edges of the flat profile are rounded, including the transition of the side grooves 7 to the central web. 8

In a modification of the embodiment of the FIG. 2 shows FIG. 3 a variant with a slightly different profiling. The flat profile 12 shown differs from the embodiment of the FIG. 2 by the slightly different design of the side grooves 13. The adjoining the central web 15 groove flanks 16 are in the same Slope angle W4 to the central longitudinal plane MLE as the groove flanks 16 of the center groove 17. This results in a over the entire cross-section substantially constant wall thickness distribution of the flat profile 12, whereby voltage spikes in the material can be avoided.

Another difference over the embodiment of the FIG. 2 is that the outer groove flank 18 of the side grooves 13 is more rounded over a radius corresponding to the flank height. As a result, the side grooves 13, unlike the first embodiment, are no longer symmetrical. Overall, however, the material distribution is more uniform in such a cross-sectional shape.

Reference numerals:

1 -

gutter brackets

2 -

Top hook

3 -

attachment section

4 -

clamping tongue

5 -

clamping tongue

6 -

upper flat side

7 -

side groove

8th -

center web

9 -

edge web

10 -

lower flat side

11 -

center groove

12-

low profile

13-

Seitennut v. 12

14-

Middle bridge v. 12

15

Groove flank v. 13

16-

Groove flank v. 17

17-

Middle well v. 12

B -

Width v. 1

B1 -

Width v. 8th

H -

Height v. 1

MLE -

Mid-longitudinal plane v. 1, 13

W1 -

angle

W2 -

angle

W3 -

angle

W4 -

angle

Claims (3)

1. Method for producing a gutter bracket for an eaves gutter, a semi-finished product being rolled into a substantially W-shaped flat profile, the semi-finished product used being a wire-shaped metal profile and two side grooves (7, 13) running in the longitudinal direction of the gutter bracket (1) being rolled into a flat side (6) of the flat profile, characterised in that the semi-finished product used has a round cross-section.
2. Method according to claim 1, characterised in that a centre groove (11, 17) running in the longitudinal direction is rolled into an opposing flat side (10).
3. Method according to claim 1 or 2, characterised in that a metal from a group containing steel materials, copper and copper alloys, aluminium and aluminium alloys is selected for the metal profile.

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