EP3269509B1 - Pliers for punching holes on trapezoidal profiles - Google Patents

Description

The invention relates to trapezoidal punch pliers with the features of the preamble of claim 1.

To attach installations to a ceiling structure made of trapezoidal sheet metal profiles, trapezoidal punch pliers are used, with which holes can be punched on the two inclined legs of the trapezoidal profile at the same time, to which, in turn, cable routes, light fittings or cable guides can be attached. Such trapezoidal punch pliers must be hand-operated and have a kinematic design similar to that of pruning shears, that is, two articulated pliers legs, each carrying a cutting punch, are relatively short, whereas from the hinge point to the other side, significantly longer lever arms with handles are designed so that the user can apply the forces required for punching.

Working with trapezoidal punch pliers is very exhausting and tiring, since as a rule not only a few individual punchings have to be made, but several rows along larger length sections of trapezoidal sheets. The work must be carried out overhead and, due to the long lever length, the user has to press the lever from a widely spread position.

The object of the present invention is thus to provide a trapezoidal punch with which the work described can be carried out much more easily.

This object is achieved by a trapezoidal punch with the features of claim 1.

Here, the two lever arms on the side of the joint facing away from the two pliers legs are only very short and their inner flanks facing each other are profiled so that they can be coupled with an electric pressing tool for heating and plumbing needs.

Such pressing tools are known in principle, for example from DE 199 27 776 A1 . The pressing tools that can be placed thereon have two pressing legs with which crimp connections can be made from pipe ends or fittings can be attached to one pipe end.

Due to the long levers that are no longer required according to the invention, which are required for manual operation of punch pliers, and the possibility of using an electric pressing tool, it is possible to make punchings on a trapezoidal sheet much easier. Even if the total weight of the unit consisting of trapezoidal punch pliers designed according to the invention and an electric pressing tool that can be coupled therewith is not less than the weight of the known hand tool, the mode of operation is much more ergonomic. The tool unit only has to be guided to the point to be machined and held there. The tool unit can be guided much closer to the body. It is no longer necessary to carry out sweeping movements with the arms and the considerable forces required for punching no longer have to be exerted by muscle power. Due to the widespread use of pipe pressing tools, the trapezoidal punch pliers according to the invention can also be used cost-effectively, since the electric drive unit of the pressing tool is either already available in the craft businesses or is available on the market in various variants.

The punch pliers according to the invention has two pairs of stop surfaces. A first pair is referred to as the front stop surfaces and is arranged with a slight offset of the connecting line of the two hinge points on the side of the front ends of the punch pliers legs; the other pair on the opposite Side of the connecting line. The opening path of the punch pliers legs is limited by the rear stop surfaces.

Essential to the invention are, among other things, the length ratio on the punch pliers legs. The front ends, which extend between a front tip, which carries the punch, and the bearing pin, are significantly longer than the rear ends of the hole legs on the other side of the bearing pin. The length ratio is at least 1.5: 1. This is the only way to achieve a large opening angle that enables the punch to be placed on both sides of the trapezoidal profile at the same time.

If trapezoidal profiles with different widths are used, the trapezoidal punch pliers have an adjustable closed position. Depending on which trapezoidal sheets are perforated, grub screws can be inserted into the threaded holes provided. The pins can be adjusted by the thread so that they protrude more or less from the stop surface, so that the closing angle of the punch pliers legs is limited depending on the width of the trapezoidal sheet metal. The force-controlled press machine switches off when the pins meet. It is also possible to use a threaded pin on one side so that it presses against the opposite stop surface.

An alternative way of limiting the travel to work is to shorten / limit the travel of the pressure rollers. As soon as the pressure rollers can no longer immerse deeply to close to the holding plate, the jaws can no longer be locked tightly. A mechanical shortening of the path can also be achieved by inserting a screw between the two lower ends of the punch pliers legs. The travel of the pressure rollers is reduced by the height of the screw head.

The punch pliers according to the invention have, in particular, a defined symmetrical open position in that a centering pin is placed on the central axis between the rear ends of the punch pliers legs lying on the other side of the bearing pin. Together with a corresponding shape, it is achieved that the two punch pliers legs are forced into an orientation that is symmetrical with respect to the central axis.

The closing is preferably assisted by a compression spring, but for the punching process it takes place predominantly through the force exerted via the pair of rollers of the electric pressing tool. In contrast to the pressing of sanitary fittings and pipe connections, however, the force exerted by the punch on a comparatively thin-walled trapezoidal sheet metal profile must be severely limited. Therefore, only a certain closing path is allowed by the abutting front stop surfaces and a certain distance between the punch pliers legs is always maintained, which is dimensioned so that the trapezoidal sheet profile is not squeezed on its side flanks after the punch has penetrated it.

The invention is described with reference to the main application, the punching of recesses in a sheet metal profile, for which purpose punches are used on the punch legs. However, it is also possible to provide cutting punches in order to be able to make cuts in sheet metal, or riveting punches in order to be able to use rivets. The term "punch" therefore includes tool inserts with a different shape.

Fig. 1

eine erfindungsgemäße Trapezlochzange gemäß einer ersten Ausführungsform in perspektivischer Explosionsdarstellung;

Fig. 2

die Trapezlochzange in seitlicher Ansicht in geöffneter Stellung;

Fig. 3

die Trapezlochzange in seitlicher Ansicht in geschlossener Stellung;

Fig. 4

eine erfindungsgemäße Trapezlochzange gemäß einer zweiten Ausführungsform in perspektivischer Explosionsdarstellung;

Fig. 5a

die Trapezlochzange nach Fig. 4 in seitlicher Ansicht in geöffneter Stellung;

Fig. 5b

Teile der Trapezlochzange nach Fig. 4 in seitlicher Ansicht in geöffneter Stellung;

Fig. 5c

ein Detail aus Fig. 5b;

Fig. 6a

die Trapezlochzange nach Fig. 4 in seitlicher Ansicht in geschlossener Stellung;

Fig. 6b

Teile der Trapezlochzange nach Fig. 4 in seitlicher Ansicht in geschlossener Stellung;

Fig. 6c

ein Detail aus Fig. 6b und

Fig. 7

eine erfindungsgemäße Trapezlochzange gemäß einer dritten Ausführungsform mit variablem Anschlag.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings. The figures show in detail:

Fig. 1

a trapezoidal punch pliers according to the invention according to a first embodiment in a perspective exploded view;

Fig. 2

the trapezoidal punch pliers in a side view in the open position;

Fig. 3

the trapezoidal punch pliers in a side view in the closed position;

Fig. 4

a trapezoidal punch pliers according to the invention according to a second embodiment in a perspective exploded view;

Figure 5a

the trapezoidal punch Fig. 4 in side view in open position;

Figure 5b

Parts of the trapezoidal punch pliers Fig. 4 in side view in open position;

Figure 5c

a detail Figure 5b ;

Figure 6a

the trapezoidal punch Fig. 4 in side view in closed position;

Figure 6b

Parts of the trapezoidal punch pliers Fig. 4 in side view in closed position;

Figure 6c

a detail Figure 6b and

Fig. 7

a trapezoidal punch pliers according to the invention according to a third embodiment with a variable stop.

• zwei spiegelbildlich zueinander ausgebildete Lochzangenschenkel 10, 20;
• zwei Lochstempel 50 und
• eine Gelenkeinheit 30.

Figure 1 shows a trapezoidal punch pliers 100 with all its individual parts in an exploded view. The main components are:

• two hole pliers legs 10, 20 which are designed to be mirror images of one another;
• two punches 50 and
• a hinge unit 30.

In the end region of each punch pliers leg 10, 20, a punch 50 is arranged on the respective inner flank. This has, for example, an end provided with a thread 51, so that an axial adjustment and thus an adjustment of the penetration depth are possible via nuts 52.

The two punch pliers legs 10, 20 are connected to one another via a joint unit 30, which is designed identically on the top and bottom. A joint base plate 31 is provided there, which has two bearing bores 32. A bearing pin 33 is guided through a bore 13, 23 on each punch pliers legs 10, 20. The bearing bolts 33 are provided with a threaded hole at both ends so that they can be screwed to the joint base plate 31 via washers 34 and screws 35.

A compression spring 40 holds the punch pliers legs 10, 20 in the closed position in order to facilitate transport and handling.

The mounting via two bearing bolts 33 arranged at a distance from one another has the advantage that no overlapping of parts of the punch pliers legs 10, 20 is necessary, so that there is also no weakening due to reduced cross-sections. The defined position and the symmetrical movement when closing and opening the two punch pliers legs 10, 20 are achieved by coupling with the electric pressing tool, which moves the two short ends 11, 21 in the same way through its roller drive.

The inner contour of the punch pliers legs 10, 20 is essential for the function of the trapezoidal punch pliers 100. The short ends 11, 21 must be rounded in order to facilitate the entry of the rollers of the pressing tool. Between the ends 11, 21, the contour must taper in the direction of the joint unit 30 in order to define an end region for the extension path of the pair of rollers. Stop surfaces 14 in the area of the joint unit 30 on the one hand and an obliquely outwardly extending contour of the respective long ends 11, 21 of the punch pliers legs 10, 20 are required so that there is a defined closed position in which the ends 12; 12 'and also the punch 50 maintain a distance from one another and do not press against one another. This distance must be adapted to the trapezoidal profile to be processed so that the profile is only punched, but not crushed. The outwardly receding long ends 12, 12 'can be V-shaped to one another; but they are preferably rounded semi-parabolic on the inside. This results in the advantage that the ends 12, 12 ′ run approximately parallel to one another and the fastening bores for the punch 50 can be made perpendicular to the ends 12.

In Figure 2 the opened trapezoidal punch pliers 100 is shown in a side view, but without the electrical pressing tool 200 required for use, which is only indicated here by a dash-dotted line.

The two punch pliers legs 10, 20 enclose a trapezoidal sheet metal profile 300. By actuating the press tool 200, on which the trapezoidal punch pliers 100 are placed, the rollers 201 of the press tool 200 are pressed between the short, rounded legs 11, 21 of the two punch pliers legs 10, 20, whereby we forced a closing movement.

The closed position is in Fig. 3 shown. The punch 50 penetrate the trapezoidal sheet 300. The punching is thus produced. As soon as the rollers 201 move back again, the two pliers legs 10, 20 can return to their widely spread starting position.

A second preferred embodiment trapezoidal punch pliers 100 'shown in FIG Fig. 4 is shown in an exploded view, is unchanged in terms of the shape of the punch legs 10, 20. A joint unit 30 'is also formed identically with two parallel joint plates 31' above and below the punch pliers legs 10, 20. In contrast to the first embodiment, the trapezoidal punch pliers 100 ′ according to FIG Fig. 4 In the joint unit 30 ', no screw connection of the bearing bolts 33' to the joint base plates 31 'is provided, but an axial fixing of the bearing bolts 33' to the joint base plates 31 via locking rings 34 'placed on the ends. The punch pliers legs 10, 20 are held in a closed position by means of a compression spring 40 which is guided in blind holes in the stop surfaces 15.

Furthermore, the trapezoidal punch pliers 100 'additionally have a locking unit 60' arranged on the central axis for a depth stop 67 '. This serves to maintain the desired distance from the underside of the trapezoidal sheet profile 300 and accordingly to carry out the punchings at the intended height of the lateral flanks of the trapezoidal sheet profile 300. The depth stop 67 'in the form of an angled wire profile can be inserted into a receptacle of a threaded sleeve 62'. The threaded sleeve 62 'is screwed to the joint base plate 31' via a screw and a lock nut 63 '. At the other end of the threaded sleeve 62 ', a further screw element 66' is inserted, which can be easily rotated via a knob 65 '. When the threaded shaft of the screw element 66 'hits the inserted depth stop element 67', this is clamped and the set stop depth is fixed.

In addition, the trapezoidal punch pliers 100 'in the joint unit 30' has a centering pin which is connected to at least one of the base plates 31 'and which has the effect that both punch pliers legs 10, 20 assume a symmetrical open position so that the two punch pliers legs 10, 20 are not misaligned takes place because in this case the punching and pressing punches 50 would start at different heights on the trapezoidal sheet metal profile 300 and could lead to a height offset of the punched recesses.

Figure 5a shows the trapezoidal punch pliers 100 'according to the second embodiment of the invention in a view from above. The tool according to the invention is connected to a pressing tool 200 and is driven via its roller pair 201. The centering pin 35 'is arranged between the two punch pliers legs 10, 20, which is attached to the central, rear bore of the T-shaped base member 31 '.

In the in Figure 5a The open position shown, the pair of rollers 201 of the pressing tool 200 is not yet inserted between the rear ends 11, 21 of the trapezoidal punch pliers 100 '. Correspondingly, the two punch pliers legs 10, 20 are still spread apart from one another. The depth stop element 67 ′ is set such that it rests on the underside of the trapezoidal sheet metal profile 300.

In Figure 5b is the position of the trapezoidal punch pliers legs 10, 20 opposite Figure 5a unchanged. However, the upper joint base plate 31 'including the locking unit 60' has been removed in order to be able to better represent the position of the two punch pliers legs 10, 20 in relation to one another and in relation to the centering bolt 35 '. In the open position, in which the front ends 12, 22 of the punch pliers legs 10, 20 are spread apart, they rest against each other on stop surfaces 15 which are slightly below the horizontal line extending through the two bearing bolts 33 '. As a result, the maximally splayed position is specified. In addition, the two punch pliers legs 10, 20 rest with their rear ends 11, 21 on the centering bolt 35 in order to achieve an exactly symmetrical alignment of the two punch pliers legs with respect to the central axis and to avoid tilting to the side.

The storage area for the two punch pliers legs 10, 20 is shown in FIG Figure 5c shown in an enlarged detail. The punch pliers legs 10, 20 lie flat against one another on the stop surfaces 15. The centering bolt 35 'lies between the rear ends 11, 21, with some play so that it is ensured in any case that the stop surfaces 15 lie close to one another and no double fit is formed.

In Figure 6a is analogous to Figure 5a the position of the trapezoidal punch pliers 100 'according to the invention in relation to a trapezoidal sheet profile 300, but in this illustration the punch legs 10 20 are maximally closed and the punching and pressing tools 50 have penetrated the lateral profile legs of the trapezoidal sheet profile 300. The depth stop 67 ′ also indicates the correct positioning in relation to the trapezoidal sheet metal profile 300 in this position.

In Figure 6b the upper joint base plate 31 'and the locking unit 60' are again removed. It can be seen that the stop surfaces 15 no longer rest against one another, so that the view of the compression spring 40 arranged between the punch pliers legs 10, 20 is cleared.

Figure 6c again shows an enlarged view from the area of the mounting of the two punch pliers legs 10, 20. As already stated, the two stop surfaces 15 are no longer in front of each other after the front ends 12, 22 have been moved towards each other and those on the other side of the bearing line between the bearing bolts 33 arranged rear ends 11, 21 have been spread apart. The spring 40 holds the closed position of the front legs of the punch pliers legs 10, 20. There is no longer any contact with the centering pin 35 in this position.

Fig. 7 shows a trapezoidal punch pliers 100 "according to a third embodiment. This corresponds to the other embodiments with regard to the geometry of the trapezoidal punch legs 10", 20 "and their connection via a joint unit 14 etc. The difference is that the trapezoid punch legs 10", 20 "receiving recesses 16 "in the form of through threaded holes.

The tool according to the invention is shown in FIG Fig. 7 not connected to a pressing tool 200. The position of the trapezoidal punch pliers legs 10 ", 20" is shown in the open position, in which the front ends 12 ", 22" of the punch pliers legs 10 ", 20" are maximally spread apart and the rear stop surfaces 15 "lie against one another.

In the trapezoidal punch pliers 100 ", two devices are provided to change the stop point of the punch pliers legs 10", 20 "and to be able to adjust the closing angle and the free space between their front ends 11", 21 ".

On the one hand, the two trapezoidal punch pliers legs 10 ″, 20 ″ are provided with threaded pins 17 ″ as setting elements, which are introduced into the threaded bores 16 ″ provided for this purpose. By turning the threaded pins 17 ", their spacing in relation to the stop surfaces 14" on the inner flanks of the punch pliers legs 10 ", 20" changed and thereby the closing angle can be adjusted so that a profile located between the front ends 11 ', 21 "is not squeezed.

A second possibility to limit the dwell angle between the trapezoidal punch pliers legs 10 ″, 20 ″ is also shown in FIG Fig. 7 pictured. The schematically shown screw 19 ″ in the rear area prevents any complete rolling in of the pair of rollers 201 (see Fig. Figure 6a ). As a result, the trapezoidal punch pliers legs 10 ″, 20 ″ cannot reach their maximum closed position, which is so desired with wider trapezoidal sheets.

Claims (11)

1. Trapezoidal piercing pliers (100; 100'), at least comprising two pliers legs (10, 20; 10", 20") arranged mirror-inverted to each other, each with a piercing punch (50; 50"), as well as a joint unit (30; 30') for connecting the two piercing pliers legs (10, 20; 10", 20"),
   characterized by,

   - that the ends (11; 21) of the piercer legs (10, 20; 10", 20") facing away from the front ends (12; 22) with the piercing punches (50; 50") are designed for connection to a double roller feed fork of an electric pressing tool (200);

   - that the punch legs (10, 20; 10", 20") have front stop surfaces (14) at the front ends (12, 22; 12", 22") in the region of the joint unit (30), which stop surfaces (14) abut against each other in the closed position, wherein a distance is maintained between the front ends (12; 22) of the punch legs (10, 20; 10", 20") and between the punches (50; 50").
2. Trapezoidal hole punch (100; 100'; 100") according to claim 1, characterized in that the hole punch legs (10, 20; 10", 20") have rear stop surfaces (15) in the region of the joint unit (30) at the rear ends (11, 21; 11", 21"), the hole punch legs (10, 20; 10", 20") abutting one another in the open position at the rear stop surfaces (15).
3. Trapezoidal punch (100; 100'; 100") according to claim 1 or 2, characterized in that the rear ends (11, 21; 11", 21") of the punch legs (10; 20) each have a semi-parabolic inner contour extending from the rear stop surfaces (15).
4. Trapezoidal hole punch (100; 100'; 100") according to any one of claims 1 to 3, characterized in that the joint unit (30; 30') comprises two bearing pins (33; 33') fixed between two joint base plates (31).
5. Trapezoidal hole punch (100; 100'; 100") according to one of claims 1 to 4, characterized in that a centering pin (35) is arranged on the central axis, between the rear ends (11, 21; 11", 21") of the trapezoidal hole punch legs (10, 20; 10", 20").
6. Trapezoidal hole punch (100; 100'; 100") according to claim 5, characterized in that the centering pin (35) is arranged between the joint base plates (31) and is connected to at least one of the joint base plates (31).
7. Trapezoidal hole punch (100') according to any one of claims 1 to 6, characterized by a locking unit (60') which is connected to one of the joint base plates (31) and in which an adjustable depth stop element (67') can be inserted.
8. Trapezoidal punch (100; 100'; 100") according to any one of claims 1 to 7, characterized in that the piercing punches (50; 50") are detachably connected to the front ends (12, 22; 12", 22") of the trapezoidal punch legs (10, 20; 10", 20").
9. Trapezoidal hole punch (100; 100'; 100") according to claim 8, characterized in that the distance of the front edge of the hole punches (50; 50") with respect to the front ends (12, 22; 12", 22") is adjustable.
10. Trapezoidal hole punch (100") according to at least one of the preceding claims, characterized in that in at least one hole punch leg (10", 20") there is arranged in each case at least one adjusting element (17") which is adjustable transversely to the longitudinal extent of the hole punch legs (10", 20") and which projects into the intermediate space formed between the hole punch legs (10", 20").
11. Trapezoidal hole punch (100") according to at least one of the preceding claims, characterized in that an adjusting element (17") is provided on each of the two hole punch legs (10", 20"), and in that the hole punch legs (10", 20") have two receiving recesses (16"), arranged in mirror image with respect to a longitudinal axis, for the adjusting elements (17").

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