DE9407834U1 - Notching tool - Google Patents

Description

Reference number: G 94 07 834.3 Applicant: Franz Rau File: 650-12 Date: 14.06.1995

DESCRIPTION

From klinkwerkz eug

&iacgr;&ogr; The invention relates to a hand-held notching tool for forming vertical seam finishes on pre-profiled sheets for roof and facade cladding with the features in the preamble of the main claim.

In practice, it is known to create such standing round or slanted folds on eaves by manually cutting the sheets when they are flat. This is done freehand with sheet metal shears. After cutting, the folds are bent open, overlapped and flanged. This technique is relatively inaccurate due to the freehand cutting and is also very complex. The folds can only be set up after cutting, so that inexpensive pre-profiled sheets cannot be used.

In practice, it is also known to cut pre-profiled sheets using powered cutting machines. This is also laborious, time-consuming and costly. The pre-profiled sheets have to be cut to size on the ground before assembly. The large and unwieldy metal sheets have to be pushed into the machine by hand, which requires several operators. The sheets can only be laid on the roof or facade after they have been cut to size. This can also lead to significant tolerance problems.

.Q:

DE-C-28 24 451 describes a hand-held punching device that can be used to cut triangular notches on metal sheets. Vertical seams on pre-profiled metal sheets for roof and facade cladding cannot be produced using this device. The device is equipped with a pressure-operated piston-cylinder unit, which makes the punching device complex to construct, heavy and relatively unwieldy.

A similar punching device is also shown in DE-B-15 02 778. This even requires an external pressure medium supply, which makes the punching device particularly complex to construct and unwieldy. It can therefore only be used on the ground and is also not suitable for forming the standing fold ends.

DE-C-590 766, DE-C-735 157 and US-C-3 772 782 show various hand-held sheet metal cutters, pliers or nipple tools for sheet metal processing, which, however, cannot be used for seam finishes of the type mentioned.

It is therefore an object of the present invention to provide a hand-held tool which enables the formation of standing fold finishes in a simpler and better manner.

(Continued on page 2 of the original description)

The invention solves this problem with the features in the main claim.

The notching tool according to the invention has the advantage that it can be used on the one hand on pre-profiled sheets and on the other hand at the installation site on the roof or facade. The sheets can be processed with their standing seam webs and then immediately connected to one another. The seam finish can therefore be produced in a convenient and inexpensive manner shortly before the sheet metal strips are laid on the roof or facade.

The notching tool according to the invention works very precisely because the cutting edge already has the shape of the end line of the fold finish. This can be curved, slanted or other fold finishes.

Preferably, the punch or die has one or two bevels on the cutting edge, at least in some areas. These ensure a pulling cut into the sheet metal and a point-by-point and progressive cutting contact between the punch and die. In this way, the manual forces required can be kept to a minimum.

The die has a crossbar below the die opening, the height of which corresponds to the overhang on one sheet of the seam finish. In this way, the two sheets to be joined can be processed differently with one tool. It is only necessary to place the notching tool on the inside of the seam web of one sheet and on the outside of the seam web of the other sheet. The necessary flange oversize results

itself.

The notching tool according to the invention also makes it possible to leave a flap on a flanged sheet, which provides underlay and additional sealing of the end point.

Markings are provided on the die and/or the punch to ensure simple and precise handling of the notching tool to form the different end lines or cutting lines in the sheets. It is only necessary to position the notching tool at a smaller or larger distance from the edge of the sheet according to the markings. Operating errors are therefore largely ruled out.

For particularly simple and precise handling, the notching tool can have a movable support device that is arranged so that it can be removed and/or pivoted and can be used as a base for one of the two sheets. The support device has a base plate that can be pushed under the sheet to be processed and that is narrower than the lower crossbar of the die by about the thickness of the sheet. The punch therefore cuts exactly along the surface of the sheet. With suitable storage, the support device can be placed in a working position for processing the aforementioned sheet and in a rest position above the die. In the rest position, the support device allows the other sheet to be processed without interruption.

Further advantageous embodiments of the invention are specified in subclaims.

The invention is illustrated by way of example and schematically in the drawings. In detail:

Figure 1 : the notching tool in plan view,

Figure 2 : an eaves formation with standing, round
Fold finish in the perspective
shown assembly position and next to it in a developed flat sheet metal representation,

Figure 3 : the matrix in an enlarged and
broken top view,

Figure 4 : the die in side view according to arrow IV of Figure 3,

Figure 5 : the stamp in an enlarged plan view,

Figure 6 : the stamp in a front view according to arrow VI of Figure 5,

Figure 7 : the stamp in a side view according to arrow VII of Figure 5 and

Figure 8 : the notching tool according to Figure 1 with a support device and

Figure 9: an enlarged side view of the die and support device according to arrow IX of Figure 8.

• «

Figure 1 and Figures 3 to 7 show a hand-held notching tool (1) for forming an eaves with a vertical seam finish (4) on pre-profiled sheets (5,6) for roof and facade cladding. The notching tool (1) enables the processing of pre-profiled sheets (5,6) that already have bent vertical seam webs (7,8) with flanged upper edges.

Figure 2 illustrates such an eaves design with a standing fold end (4), which in this embodiment has a round shape with a curved end line (10). The right part of the image shows the two sheets (5,6) in the assembly position and the mutual engagement of the fold webs (7,8). The left part of the image illustrates the required cutting lines and bending edges of the two sheets (5,6), which are shown in a flat development.

The two fold webs (7,8) have a curved end line (10) or cutting line that starts from the upper edge of the fold webs (7,8) and descends in a concave arc to the bottom layer of the sheets (5,6). On the right, bottom sheet (5), the end or cutting line (10) is not drawn all the way to the front edge of the sheet. This leaves a sheet tab (9) that, when in position, provides underlay and seals the fold end point. On the left, top sheet (6), there is a double overhang (23,23'). On the one hand, due to a vertical overhang (23), the fold web (8) is higher than the fold web (7) of the other sheet (5) and can therefore overlap the latter. On the other hand, the end or cutting line (10) is offset slightly forward in the longitudinal direction of the folding bars (7,8) by the other horizontal projection (23). As the right half of Figure

As shown in the drawing, this overhang (23') can be flanged at the end line (10) using a suitable tool and bent over the fold web (7) of the sheet metal (5). Both sheets (5,6) can also have a protruding edge (22) at the front end, which is bent over and provides additional sealing and security. At the point of the fold end (4), the two sheet metal edges (22) overlap.

The notching tool (1) consists of a die (2) and a punch (3) which are movably guided into one another and with which the fold webs (7,8) on the pre-profiled sheets (5,6) can be machined to a precise fit. The die (2) and the punch (3) have a cutting edge (24) corresponding to the shape of the end line (10). In the preferred and illustrated embodiment, the cutting edge (24) is bent in a U-shape. For a so-called bevelled fold end, it has bevels instead of the curved sections (11).

With the U-shaped and symmetrical cutting edge (24), the notching tool (1) can be used on both sides and enables the machining of both folding webs (7,8).

Figures 3 and 4 illustrate the design of the die (2). It consists of a cuboid-shaped plate that has a die opening (25) approximately in the middle, on the underside of which the curved cutting edge (24) is located. Below the die opening (25) there is a crossbar (17), the height of which in the middle area essentially corresponds to the size of the projection (23). Above the die opening (25) there is a wider crossbar (21).

The punch (3) corresponds in shape to the die opening (25) and is fitted into it with very little lateral play. The punch (3) is pivotably mounted in the side webs (20) of the die (2) via lateral journal bearings (16). The bearings (16) have a horizontal rotation position and are located near the upper edge of the die opening (25) or the punch (3).

The punch (3) consists of a steel plate. It has two bevels (13, 14) on the cutting edge (24). As Figure 5 shows in the top view, the first bevel (13) consists of a groove that slopes inwards from the cutting edge (24). The inclination of the groove (13) is essentially in the normal direction to the cutting edge (24). The groove (13) can be found both on the straight section (12) and on a large part of the curved sections (11) on both sides of the cutting edge (24). Figure 7 shows the position of the groove (13) in the side view.

The second bevel (14) is designed as an undercut of the cutting edge (24). Figure 6 shows the undercut (14) in the front view of the stamp (3). The undercut (14) also begins at the arc sections (11) of the cutting edge (24), preferably slightly below the point at which the arc sections (11) merge into the vertical side edges of the stamp (3). In Figure 5, the point is marked by a dashed transverse line. Due to the undercut (14), the cutting edge (24) increasingly recedes from the side edge or arc section (11) towards the middle of the cutting edge (24). In other words, the effective cutting edge (24) descends downwards from the plate surface of the stamp (3). In the preferred embodiment, the undercut (14) is

• ·· · ♦

centrally symmetrical and therefore runs in a V-shape, as shown in Figure 6 for the straight section (12) of the cutting edge (24). Figure 7 shows how the undercut (14) runs over the curved section (11) of the cutting edge (24).

The bevel(s) (13,14) result in a point-by-point and pulling cut. Furthermore, a sharper cutting edge (24) is created. The cutting and operating path as well as the hand forces are reduced in an ergonomically favorable manner.

The die (2) and the punch (3) are each provided with a handle (18,19). The handle (18) of the die (2) is arched or bow-shaped and is an extension of the side bars (20). The handle (19) of the punch (3) is rod-shaped and is located inside the bow-like handle (18). The handle (19) is also attached at an angle to the plate surface of the punch (3). This means that in the starting position of the notching tool (1) the punch (3) is swiveled outwards at an angle. Figure 4 illustrates this position. In this position the two handles (18,19) are in one plane.

In this open position, the notching tool (1) is placed on the sheet metal (6), whereby the die (2) with the lower crosspiece (17) comes to rest on the sheet metal (6) and the swung-out punch (3) overlaps the folding web (8). On the underside of the die (2) and also on the underside of the punch (3) there are markings (15) by which the cutting edge (24) can be aligned in the desired position to the front edge of the sheet metal. The vertical projection (23) is created by the approach of the die (2) to the sheet metal (6). With the help of the markings (15)

the horizontal projection (23') can be adjusted by which the end or cutting line (10) on the sheet (6) is offset from that on the sheet (5).

By pulling the handles (18,19) apart, the punch (3) is moved towards the die (2) and cuts the folding web (8) along the desired end or cutting line (10). The end or cutting line (10) is drawn from the upper edge of the folding web to the front edge of the sheet (6).

The folding web (7) is then cut on the other sheet (5). To do this, the notching tool (1) is turned over and its die (2) is placed on the outside of the folding web (7). The sheet (5) is placed under the cutting point so that the lower cross web (17) extends under the sheet (5). The straight section (12) of the cutting edge (24) on the die (2) is thus approximately at the height of the sheet surface. Fig. 8 and 9 show an embodiment of the notching tool (1) described in more detail below with a support device (26) for exact positioning on the sheet (5).

The folding web (7) is now cut in the manner described above by operating the handles (18, 19) and pivoting the stamp (3), whereby the end or cutting line (10) is not drawn all the way to the front edge of the sheet (5). Rather, it ends at the upper edge of the edge area (22) that is to be folded over later. The flap (9) cut free in this way is then bent horizontally.

The sheets (5,6) are then placed on top of each other with the folding webs (7,8) in the manner shown in Figure 2. The edge areas (22) and the overhang are then

(23) is flanged along the end line (10). The seam end (4) is thus sealed tightly.

Modifications of the embodiment shown are possible in various ways. Firstly, the cutting edge (24) can be angled instead of bent for an oblique fold finish. In the preferred embodiment, the notching tool (1) is U-shaped and centrally symmetrical cutting edge

(24) can be used on both sides. In another

In this embodiment, a left and a right tool can also be formed, wherein the cutting edges (24) are essentially L-shaped and have a different length, taking into account the projection (23).

In a further modification, the bevels (13,14) can be arranged on the die (2) instead of on the punch (3). In addition, in both design variants, only one bevel (13) or (14) can be present.

In the embodiment shown, the handles (18, 19) are one-piece. Alternatively, they can also be split or telescopic. They can then be disassembled into smaller parts or pushed together and transported more easily.

The mutual design and mounting of the punch (3) and die (2) can also vary. In the preferred embodiment, particularly favorable lever forces are achieved, which make handling the notching tool (1) easier. Similar kinematic conditions can be achieved by modifying the mounting.

Fig. 8 and 9 show a variant of the notching tool (1) with a movable support device (26). This consists of an essentially horizontal base plate (27) which is mounted on the die (2) via lateral holding arms (28) arranged at right angles. The support device (26) is preferably pivotably mounted on the die (2), but it can also be removable.

In the preferred embodiment, the bearing is pivotable and height-adjustable. For this purpose, the holding arms (28) each have an elongated hole (32) at the upper end, through which a transverse pin (29) from the die (2) extends. The pin (29) is preferably at the height of the bearing (16) of the punch (3) and can represent its extension.

The holding arms (28) are fixed using suitable clamping elements (31), preferably wing nuts, which can be screwed onto the pins (29) with a thread at the end and clamp the holding arms (28) against the die (2). In addition, spring catches (33) can be present between the side webs of the die (2) and the holding arms (28), which lock the support device (26) in a working position and in a rest position.

The base plate (27) serves as a base for the sheet metal (5) in the manner already mentioned above, where the end line or cutting line (10) is drawn down to the sheet metal surface and into the lower fold line of the fold web (7).

The base plate (27) is thinner than the lower crosspiece (17) of the die (2). The difference in size is chosen so that the height difference essentially corresponds to the thickness of the sheet metal (5). In the working position shown in Figure 9 for processing the sheet metal (5), the base plate (26) is flush with the underside of the crosspiece (17). Its rear side rests against the side surface of the crosspiece (17) that faces the punch (3) that is swung out in the open position. The base plate (27) is arranged in a suitable manner in front of the two lateral holding arms (28) at a distance that corresponds approximately to the thickness of the die. In the working position, the two holding arms (28) extend along the sidepieces of the die (2). In the working position, the sheet metal (5) can be placed on the base plate (27), whereby the upper edge of the lower crosspiece (17) is essentially at the level of the sheet metal surface, so that the punch (3) with its straight section (12) cuts quite precisely along the sheet metal surface.

To machine the other sheet (6), the support device (26) can be brought into a rest position, which is shown in dashed lines in Fig. 9. To do this, the support plate (27) with the holding arms (28) in the slot (32) is pulled downwards opposite the pins (29) until it is located below the crossbar (17). It can then be swung backwards under the die (2), whereby in the end position the support plate (27) takes up a position above the die (2). It is then located outside the working area of the die (2) and the punch (3), whereby the lateral holding arms (28) also come to lie along the side bars of the die (2).

* 9 *# • *** * *
4 « ft* • «-
* · * ft ♦
* * * ·· « * ♦ · *

The back of the base plate (27) rests against the handle (18) on the die side and has a corresponding recess (30) in the middle, with which it can partially enclose the handle (18). The recess (30) also allows the holding arms (28) to be arranged in alignment with the side webs of the die (2).

To return to the working position, the support device (26) is swiveled back, passed under the die (2) and then pushed up again in the elongated holes (32) and brought into the aforementioned stop position on the crosspiece (17). The support plate (27) can have bevels on the front and side edges to make it easier to grip the sheet metal (5) underneath.

Variations can also be made in the support device (26) compared to the embodiment shown. This concerns the bearing, which can be designed as a simple plug-in bearing, and also the clamping elements, which can be designed as spring pins, clamps or the like. Likewise, the base plate (26) can alternatively be individually attached to the die in the working position and removed again for processing the other sheet.

REFERENCE SIGN

1 Notching tool 2 die 3 Rubber stamp 4 Fold finish 5 sheet 6 sheet 7 Folding bar 8th Folding bar 9 rag 10 End line 11 Arch section 12 straight section 13 chamfer, groove 14 Bevel, undercut 15 mark 16 camp 17 Crossbar below 18 Handle, die 19 Handle, stamp 20 Side bar 21 Crossbar above 22 edge 23,23' Got over 24 Cutting edge 25 Matr i &zgr; enö ffnung 26 Support device 27 Base plate 28 Holding arm 29 cone 30 Recess 31 Clamping element 32 Long hole 33 Spring catch

15

Claims (21)

15 PROTECTION CLAIMS 1.) Hand-held notching tool for forming standing seam finishes on pre-profiled sheets for roof and facade cladding, characterized in that the notching tool (1) has a die (2) and a punch (3) which are movably guided into one another and have a cutting edge (24) corresponding to the end line (10) of the seam finish (4). 2.) Notching tool according to claim 1, characterized in that the cutting edge (10) is bent in a U-shape. 3.) Notching tool according to claim 1 or 2, characterized in that the punch (3) or the die (2) has at least one bevel (13, 14) at least in some areas on the cutting edge (24). 4.) Notching tool according to claim 3, characterized in that the one bevel (13) is designed as a groove which slopes away from the cutting edge (24) essentially in the normal direction. 5.) Notching tool according to claim 3 or 4, characterized in that the other bevel (14) is designed as an undercut, the cutting edge (24) increasingly receding from the lateral edge towards the center. 6.) Notching tool according to claim 5, characterized in that the undercut (14) is centrally symmetrical and has a V-shape. 7.) Notching tool according to claim 1 or one of the following, characterized in that the punch (3) is rotatably mounted on the die (2) (16) and is precisely fitted into the die opening (25). 8.) Notching tool according to claim 1 or one of the following, characterized in that the die (2) has a transverse web (17) on the lower edge, the height of which corresponds to the projection (23) of the fold end (4). 9.) Notching tool according to claim 1 or one of the following, characterized in that the die (2) and/or the punch (3) have one or more markings (15) for the length of the fold end (4). 10.) Notching tool according to claim 1 or one of the following, characterized in that the die (2) is provided with a bow-shaped handle (18) and the punch (3) is provided with a rod-shaped handle (19). 11.) Notching tool according to claim 10, characterized in that the handle (19) is attached to the stamp (3) at an angle. · t · 12.) Notching tool according to claim 10 or 11, characterized in that the handles (18, 19) are designed to be divisible or telescopic. 13.) Notching tool according to claim 1 or one of the following, characterized in that a support device (26) for the sheets (5, 6) is movably arranged on the notching tool (1). 14.) Notching tool according to claim 13, characterized in that the support device (26) has a base plate (27) which is thinner than the lower crosspiece (17) of the die (2), wherein the size difference essentially corresponds to the sheet thickness. 15.) Notching tool according to claim 13 or 14, characterized in that the base plate (27) is pivotally mounted on the die (2) via lateral holding arms (28). 16.) Notching tool according to claim 13, 14 or 15, characterized in that the base plate (27) is spaced in front of the holding arms (28) and, in the working position, strikes the lower crosspiece (17) on the side facing the opened punch (3). 17.) Notching tool according to claim 13 or one of the following, characterized in that the base plate (27) is additionally mounted on the die (2) in a height-adjustable manner and can be pivoted past the crosspiece (17) into a rest position above the die (2). • » ** ♦♦·· ·· ♦ 18.) Notching tool according to claim 13 or one of the following, characterized in that the holding arms (28) are guided via an elongated hole (32) on a pin (29) and can be fastened with clamping means (31). 19.) Notching tool according to claim 13 or one of the following, characterized in that the holding arms (28) can be locked in the rest and/or working position by means of spring catches (33) on the die (2). 20.) Notching tool according to claim 13 or one of the following, characterized in that Notching tool according to claim 13 or one of the following, characterized in that the base plate (28) has a recess (30) for the handle (18) on the back. 21.) Notching tool according to claim 13 or one of the following, characterized in that the base plate (27) has bevels on the front and sides.