FALZZANGE

Description

[0001] The invention relates to a mobile folding pliers for bending sheet metal on facades and the like, comprising a first clamping surface and a second clamping surface, wherein the clamping surfaces are connected so as to be rotatable about a first axis of rotation, as well as a first handle and a second handle pivotally connected to the first handle, wherein the first handle is connected to the first clamping surface.

[0002] Various tools for folding or bending sheet metal have become known from the prior art. In particular, document US Pat. No. 5,222,386 A discloses a folding pliers of the type mentioned above. However, prior art tools are cumbersome and heavy, which is why they are not suitable, for example, for easily folding or bending sheet metal on facades.

[0003] This is where the invention comes in. The object of the invention is to provide a tool of the type mentioned above that is lightweight and easy to handle and mobile.

[0004] This object is achieved according to the invention by a folding pliers according to claim 1.

[0005] Within the scope of the invention, it was recognized that a compact and lightweight device for bending sheet metal can be easily achieved if a folding pliers is designed accordingly. Upon movement of the handles relative to one another, a sheet is initially clamped between the clamping surfaces. Upon further movement of the handles relative to one another, the sheet is subsequently bent around the second rotation axis by a movement of the clamping surfaces together with the sheet relative to the second handle. Such a folding pliers can be designed to be lightweight and compact, allowing them to be used mobile, for example, for facade work.As a rule, the clamping of the sheet metal is achieved by a movement of the clamping surfaces relative to each other around the first axis of rotation and the bending of the sheet metal is achieved by a movement of the clamping surfaces together with the clamped part of the sheet metal around the second axis of rotation with a continuous movement of the handles in order to ensure good handling.

[0006] To release the finished folded sheet from the folding pliers, the first handle is simply moved in the opposite direction to the movement used when clamping and folding the sheet, so that the folded sheet can be released from the folding pliers.

[0007] It has proven advantageous for the first rotation axis and the second rotation axis to be approximately parallel. The distance between the rotation axes is typically less than 20 cm, in particular less than 10 cm, and corresponds to the length of the desired fold or the length of the part of the sheet to be bent. The clamping surfaces typically extend from the first rotation axis to the second rotation axis, so that a sheet can be completely clamped, preferably in a region between the first rotation axis and the second rotation axis, in order to apply even load to the sheet and thus achieve a clean edge.

[0008] It is advantageous if the sheet metal can be clamped essentially across its entire surface between the first and second rotational axes by the clamping surfaces. This allows for continuous clamping in the area between the rotational axes. This ensures clean bending of the clamped sheet metal, or sheet metal secured between the clamping surfaces, with smooth bending edges.

[0009] A structurally simple yet robust design is achieved when a rotatable connection between the clamping surfaces and / or between the second clamping surface and the second handle is formed by a hinge, particularly a rod hinge. This also ensures uniform force transmission across the entire length of the rebate.

[0010] It has proven effective to connect the first gripping piece to the first clamping surface via a plate-shaped intermediate element, wherein the first gripping piece is preferably connected to the plate-shaped intermediate element via at least two connection positions, particularly arranged at the ends. This ensures uniform force application across the length of the fold, thus achieving a particularly smooth and high-quality bending edge.

[0011] Similarly, it has proven advantageous if the second handle is connected to the second clamping surface via a plate-shaped intermediate element, wherein the second handle is preferably connected to the plate-shaped intermediate element via at least two connection positions, in particular arranged at the ends.

[0012] To enable particularly compact transport, it is advantageous if the first clamping surface is rigidly connected to the first handle, preferably at an angle of less than 100°, in particular less than 50°, preferably 15° to 35°. The handles can then be arranged adjacent to one another in a transport position, from which transport position a sheet can be clamped and folded directly. Typically, the first clamping surface and the first handle are connected in the region of the first rotation axis.

[0013] It is advantageous if the first clamping surface is rigidly connected to the first handle. In a transport position in which the handles are in contact with one another, the clamping surfaces are arranged and opened at an angle of 10° to 90°, in particular 15° to 35°, preferably approximately 20°, to each other to accommodate a sheet metal. This allows for space-saving transport. On the other hand, the seaming pliers can then be used for seaming or for seaming sheet metal directly from the transport position.

[0014] In order to ensure that rotation about the second axis of rotation only occurs when the first clamping surface is positively connected to the second clamping surface, optionally via a sheet metal clamped between the clamping surfaces, it is preferably provided that in the transport position a moment which is required to move the second handle piece relative to the second clamping surface about the second axis of rotation is greater than a moment which is required to move the first handle piece about the first axis of rotation relative to the second clamping surface, so that a movement of the first handle piece from the transport position initially triggers a movement of the first handle piece relative to the second clamping surface. This can be implemented in a variety of structural ways, in particular by means of joints which form the axes of rotation and which have varying degrees of smoothness.

[0015] A robust design of rotary axes with varying degrees of smoothness can be achieved in a simple manner if at least one spring is provided on a joint which forms the second rotary axis, in particular a rod hinge forming the second rotary axis, with which spring a frictional force acting between parts of the joint which are movable relative to one another can be introduced into the joint in order to define a torque required to initiate a movement of the joint, wherein a spring force can be adjusted in particular by means of a clamping screw. For example, spring-loaded pressure pieces acting on parts of the second rotary axis which are moved relative to one another can be provided, so that movement of the hinge or movement of the second clamping surface relative to the second handle piece about the second rotary axis is only possible by overcoming a frictional torque or torque caused by the spring.a frictional force acting on the parts of the second axis of rotation that are movable relative to one another is possible. It is understood that more than one spring can also be provided in order to introduce a uniform frictional force over the length of the hinge. The spring thus acts, for example, directly on a first part of the joint forming the second axis of rotation, which is movable relative to a second part of this joint, and presses the first part against the second part with the spring force, so that in order to move the first part relative to the second part, it is necessary to overcome a frictional force that is defined by the spring force and a friction coefficient.

[0016] Further features, advantages, and effects of the invention will become apparent from the following exemplary embodiment. Reference is made to the drawings, which show: Fig. 1 bis 3 a folding pliers according to the invention in different operating states; Fig. 4 a folding pliers according to the invention including a sheet; Fig. 5 a detail of a folding pliers according to the invention according to Fig. 4 ; Fig. 6 a folding pliers according to the invention including a sheet; Fig. 7 another folding pliers according to the invention including a sheet.

[0017] Fig. 1 bis 3 show a folding pliers 1 according to the invention in different operating states. As can be seen, the folding pliers 1 have a first handle 6 and a second handle 7, wherein the first handle 6 is rigidly connected to a first clamping surface 2. The first handle 6 and the first clamping surface 2 are, as shown, connected to a second clamping surface 3 so as to be rotatable about a first rotation axis 4, so that a part of a sheet 8 or the like can be clamped between the clamping surfaces 2, 3.

[0018] The second clamping surface 3 is rotatably connected to a second handle 7 via a second rotational axis 5, which is parallel to the first rotational axis 4, so that a sheet 8 clamped between the clamping surfaces 2, 3 can be bent or folded about the second rotational axis 5 by a rotational movement of the clamping surfaces 2, 3 connected via the clamped sheet piece.

[0019] Both the movement of the first clamping surface 2 relative to the second clamping surface 3 about the first axis of rotation 4 and the bending movement of the two clamping surfaces 2, 3 about the second axis of rotation 5 can be triggered by a movement of the first handle 6 relative to the second handle 7, so that clamping and bending of sheet metal 8 can take place with a continuous movement of the first handle 6 relative to the second handle 7.

[0020] In Fig. 1 The folding pliers 1 are shown in a transport position in which the folding pliers 1 require minimal space and the handles 6, 7 are essentially in contact with one another. From this transport position, a sheet 8 can be clamped and folded directly. For this purpose, a sheet 8 to be folded is placed between the clamping surfaces 2, 3 of the folding pliers 1, which in this transport position are open at an opening angle β of approximately 10° to 35°.

[0021] In order to clamp a sheet 8 arranged between the clamping surfaces 2, 3 or to fix it force-fittingly between the clamping surfaces 2, 3, a first handle 6 of the folding pliers 1 is moved relative to a second handle 7 of the folding pliers 1 from the Fig. 1 shown position clockwise in the direction of movement 13. Since the first clamping surface 2 is rigidly connected to the first handle 6, a rotary movement of the first handle 6 also causes a rotary movement of the first clamping surface 2 relative to the second clamping surface 3, whereby a sheet 8 arranged between the clamping surfaces 2, 3 is clamped by the clamping surfaces 2, 3 when the first handle 6 is moved clockwise relative to the second handle 7. Such a position, in which the clamping surfaces 2, 3 are closed, an opening angle β between the clamping surfaces 2, 3 is therefore 0 °, is shown in Fig. 2 shown.

[0022] From the Fig. 2 In the position shown, with a further movement of the first handle 6 relative to the second handle 7 in the direction of movement 13, no further movement of the first handle 6 relative to the second clamping surface 3 about the first rotation axis 4 is possible, especially since the clamping surfaces 2, 3 are already closed. A further movement of the first handle 6 relative to the second handle 7 clockwise in the direction of movement 13 therefore causes Fig. 2 In the clamping position shown, a rotational movement of the clamping surfaces 2, 3 together with the sheet 8 and the first handle 6 clockwise around the second rotation axis 5. During this movement, the sheet 8 clamped between the clamping surfaces 2, 3 is bent. A bending position in which the clamping surfaces 2, 3 are closed and pivoted relative to the second handle 7 is shown in Fig. 3 shown. Here it can also be seen that the first clamping surface 2 is connected at an angle α of approximately 50° to an intermediate element 10, via which the first clamping surface 2 is rigidly connected to the first handle 6.

[0023] In order to release the finished folded or bent sheet 8 from the folding pliers 1, the first handle 6 is simply moved in the opposite direction to the direction of movement 13 during clamping and folding, i.e. counterclockwise in this case, so that the clamping surfaces 2, 3 are opened and the sheet 8 is released.

[0024] Fig. 4 bis 6 show a folding pliers 1 according to the invention in an operating position as in Fig. 3 shown, but with a sheet 8 clamped between the clamping surfaces 2, 3. As can be seen, the sheet 8 is bent in the area of ​​the second rotation axis 5. This is achieved by the sequence of movements described above.

[0025] As shown, the grips 6, 7 are connected to the clamping surfaces 2, 3 via plate-shaped intermediate elements 10, wherein the grips 6, 7 are arranged in end regions of the plate-shaped intermediate elements 10 or are connected to the grips 6, 7 at end-arranged connection positions 11 in order to ensure uniform force transmission and introduction into the sheet 8.

[0026] Especially in Fig. 6 It can be seen that the first axis of rotation 4 and the second axis of rotation 5 are constructed here by rod hinges 9 in order to transmit forces particularly evenly.

[0027] It is understood that the length of the plate-shaped intermediate elements 10 or the rotation axes 4, 5 is selected according to the sheet metal 8 to be folded or bent and can be individually adjusted if necessary. Similarly, the length of the handles 6, 7 or their distance from the rotation axes 4, 5 can be adapted to a specific application, so that the folding pliers 1 can be easily operated or the sheet metal 8 can be easily folded using appropriate lever lengths.

[0028] Fig. 7 shows a further embodiment of a folding pliers 1 according to the invention together with a sheet 8, wherein the folding pliers 1 are essentially analogous to the one shown in Fig. 6 illustrated folding pliers 1, but additionally has springs fastened with clamping screws 12 in the region of the second rotation axis 5. The springs generate a frictional force acting between relatively movable parts of the rod hinge 9 forming the second rotation axis 5, so that a frictional moment caused by these springs must be overcome before the second clamping surface 3 can be moved relative to the second handle 7 about the second rotation axis 5. No corresponding springs are provided on the first rotation axis 4, which is why a moment to rotate the second clamping surface 3 relative to the second handle 7 about the second rotation axis 5 is greater than a moment to rotate the first handle 6 about the first rotation axis 4 relative to the second clamping surface 3. This ensures that during a pivoting movement of the first handle 6 from the Fig. 1illustrated transport position in the direction of movement 13, a rotational movement of the first handle 6 together with the first clamping surface 2 about the first axis of rotation 4 relative to the second clamping surface 3 initially occurs, and a rotational movement of the first clamping surface 2 together with the second clamping surface 3 about the second axis of rotation 5 only occurs when the first clamping surface 2 is positively connected to the second clamping surface 3, possibly via a sheet metal 8 or the like clamped between the clamping surfaces 2, 3, or is in contact with it. Analogously, this predetermines the sequence of movements when opening the seaming pliers 1. This ensures easy handling of the tool. The level of the friction torque to be overcome can be adjusted using the clamping screws 12, via which a preload of the springs can be adjusted.

[0029] A seaming pliers 1 according to the invention is space-saving, lightweight, and easy to handle, which makes it easy to use in a mobile manner, for example, to bend metal sheets 8 on facades and the like. Furthermore, the seaming pliers 1 according to the invention are robustly designed, making them suitable for harsh operating conditions, especially on construction sites.

Claims

1. A portable seaming pliers (1) for bending sheet metal (8) on facades and suchlike, comprising a first clamping face (2) and a second place (3), wherein the clamping faces (2, 3) are connected rotatably about an axis of rotation (4) at a first end of the two clamping faces (2, 3), and a first grip (6) and a second grip (7) connected in a swivelling manner to the first grip (6), wherein the first grip (6) is connected torque-proof to the first clamping face (2), wherein the second grip (7) is connected rotatably to the second clamping face (3) about a second axis of rotation (5) at a second end of the two clamping faces (3) lying opposite the first end, so that when the first grip (6) is swivelled relative to the second grip (7) from a transport position into a movement position (13), the first clamping face (2) is moved relative to the second clamping face (3), in such a way that a sheet metal (8) arranged between the clamping faces (2, 3) can be clamped by the clamping faces (2, 3), after which a further swivelling movement of the first grip (6) relative to the second grip (7) in movement direction (13) brings about a rotational movement of the first clamping face (2) together with the second clamping face (3) about the second rotational axis (5) relative to the second grip (7), in order to bend the clamped sheet metal (8).

2. The portable seaming pliers (1) according to claim 1, characterised in that the first axis of rotation (4) and the second axis of rotation (5) are approximately parallel.

3. The seaming pliers (1) according to claim 1 or 2, characterised in that the sheet metal (8) can be clamped essentially by the clamping faces (2, 3) over the full area between the first axis of rotation (4) and the second axis of rotation (5).

4. The seaming pliers (1) according to any one of claims 1 to 3, characterised in that a rotatable connection between the clamping faces (2, 3) and / or between the second clamping face (3) and the second grip (7) is formed by a hinge, in particular a piano hinge (9).

5. The seaming pliers (1) according to any one of claims 1 to 4, characterised in that the first grip (6) is connected to the first clamping face (2) via a plate-shaped intermediate element (10), wherein the first grip (6) is preferably connected to the plate-shaped intermediate element (10) via at least two connection positions (11), in particular arranged at the end.

6. The seaming pliers (1) according to any one of claims 1 to 5, characterised in that the second grip (7) is connected to the second clamping face (3) via a plate-shaped intermediate element (10), wherein the second grip (7) is preferably connected to the plate-shaped intermediate element (10) via at least two connection positions (11), in particular arranged at the end.

7. The seaming pliers (1) according to any one of claims 1 to 6, characterised in that the first clamping face (2) is rigidly connected to the first grip (6), wherein in a first transport position, in which the grips (6, 7) abut against one another, the clamping faces (2, 3) are arranged at an opening angle (β) of 10° to 90°, in particular 15° to 35°, preferably approximately 25°, to one another and are opened in order to grip a sheet metal (8).

8. The seaming pliers (1) according to any one of claims 1 to 7, characterised in that in the transport position a moment that is required to move the second grip (7) relative to the second clamping face (3) about the second axis of rotation (5) is greater than a moment that is required to move the first grip (6) relative to the second clamping face (3) about the first axis of rotation (4), so that a movement of the first grip (6) from the transport position first triggers a movement of the first grip (6) relative to the second clamping face (3).

9. The seaming pliers (1) according to claim 8, characterised in that at a hinge forming the second axis of rotation (5), in particular a piano hinge (9) forming the second axis of rotation (5), at least one spring is provided with which a frictional force acting between parts of the hinge that move relative to one another can be introduced into the hinge, in order to define a moment required to initiate a movement of the hinge, wherein a spring force can be adjusted in particular by a clamping screw (12).