Hand-held tool

Abstract

Hand-held tool comprising: - two handle elements (3, 4), each of which handle elements (3, 4) is connected to a jaw element (5, 6) in a movement-coupled manner, and - a joint (7), which joint (7) connects the two handle elements (3, 4) to each other pivotably about an axis of rotation (8), wherein a gap between the two jaw elements (5, 6) can be changed by pivoting the handle elements (3, 4) to each other or the jaw elements (5, 6) can be brought into contact with each other by pivoting, wherein the joint (7) has at least one rolling bearing (14), wherein a first handle element (3) of the two handle elements (3, 4) is connected to an inner ring (16) of the at least one rolling bearing (14) and a second handle element (4) of the two handle elements (3, 4) is connected to an outer ring (17) of the at least one rolling bearing (14) in a movement-coupled manner.

Description

[0001] The present invention relates to a hand-held tool having the features of the preamble of claim 1.

[0002] Typical hand-held tools include: two handle elements, each of which is connected to a jaw element in a movement-coupled manner, and a joint, which joint connects the two handle elements to each other in a pivotable manner around a rotational axis, wherein a gap between the two jaw elements can be changed by pivoting the handle elements relative to each other, or the jaw elements can be placed against each other by pivoting.

[0003] The following section outlines the state of the art using some specific hand-held tools as examples. This applies generally to hand-held tools.

[0004] Especially in the professions of roofer and plumber, sheet metal shears and folding pliers are part of the basic equipment, which are always carried by such persons in their daily work.

[0005] A roofer or plumber usually carries tin snips or folding pliers on his tool belt or keeps them readily available in a toolbox, since the adjustment work on roofs always has to be carried out with tin snips or the final assembly of sheet metal elements on the roof has to be carried out with folding pliers.

[0006] It can be seen that these tools must meet high functional requirements, with high loads being repeatedly exerted on the tool every day.

[0007] Therefore, it is known from the prior art to implement suitable tools using materials that can withstand this stress. In this specific field of application, metal alloys are most commonly used.

[0008] However, since users of these hand-held tools usually carry the tool with them all day, often in very exposed and vulnerable locations (roofs), the state of the art has led to developments in designing these hand-held tools with the lowest possible weight.

[0009] For example, it is known from DE 20 2024 104332 U1 to design corresponding hand-held tools from an aluminum material which, despite sufficient strength against external loads, offers a significant advantage in terms of weight for an operator of the hand-held tool.

[0010] However, a problem with corresponding hand-held tools – especially those made of aluminum materials – is that under high force loads in the static – usually closed – state (as is particularly the case with folding pliers in use) they tend to cold weld at the contact points of the joint.

[0011] If a corresponding cold welding occurs between the two handle elements and / or in the joint, it can often only be resolved by applying high force and sometimes only by damaging the hand-held tool, which of course has a very negative impact on the user-friendliness and / or handling of such hand-held tools.

[0012] The purpose of the present disclosure is therefore to provide a handheld tool which can at least partially improve the aforementioned disadvantages of the prior art and / or increase user-friendliness and / or facilitate handling.

[0013] This task is solved by a hand-held tool having the features of claim 1.

[0014] It is therefore intended that a hand-held tool includes the following: two handle elements, each of which is connected to a jaw element in a movement-coupled manner, and a joint, which joint connects the two handle elements to each other in a pivotable manner around a rotational axis, wherein a gap between the two jaw elements can be changed by pivoting the handle elements relative to each other or the jaw elements can be placed against each other by pivoting, wherein the joint has at least one rolling bearing, wherein a first handle element of the two handle elements is connected to an inner ring of the at least one rolling bearing and a second handle element of the two handle elements is connected to an outer ring of the at least one rolling bearing in a movement-coupled manner.

[0015] By using a rolling bearing in the joint, a relative movement of the two handle elements can be achieved not only with less friction, but also while avoiding damage and wear, thus making the relative movement easier and better guided by a rolling motion in the rolling bearing.

[0016] Furthermore, the use of the roller bearing between the two handle elements minimizes or eliminates the risk of cold welding, thereby increasing the user-friendliness and / or handling of the hand-held tool by providing a more reliable hand-held tool.

[0017] Furthermore, compared to the state of the art, the use of the rolling bearing allows for a more precise positioning of the two handle elements relative to each other, resulting in a significantly smaller amount of play compared to the state of the art.

[0018] Advantageous embodiments are defined in the dependent claims.

[0019] It may be provided that the inner ring of the rolling bearing is formed in one piece with the first grip element and / or the outer ring of the rolling bearing is formed in one piece with the second grip element.

[0020] Preferably, the at least one rolling bearing can be designed as a separate component and is preferably mounted on the two handle elements by means of a press fit.

[0021] It may be provided that at least one rolling bearing is designed as a ball bearing, preferably a radial groove ball bearing.

[0022] Preferably, the two handle elements can be made of an aluminum alloy, preferably wherein the aluminum alloy is implemented by the material EN AW-7075.

[0023] It may be provided that the handle elements are manufactured using a drop forging process.

[0024] Preferably, the joint has a joint bolt which connects the two handle elements via the at least one rolling bearing, in particular which joint bolt is made of the same material as the handle elements.

[0025] It is possible for the second grip element to be directly connected to the pivot pin, with the pivot pin in turn directly interacting with the inner ring of the rolling bearing. The first grip element can, for example, engage directly with the outer ring of the rolling bearing.

[0026] It can be provided that a shear blade is attached to each jaw element, preferably by welding, particularly preferably by laser welding.

[0027] The shear blade can, for example, be made of a high-speed steel, preferably the material HS-6-5-2 C.

[0028] It may be provided that the shear blade is welded to a jaw element in a protective atmosphere by a laser welding process, preferably without additional material.

[0029] The protective atmosphere can be, for example, made of a noble gas or an inert gas, especially argon.

[0030] It may be planned that the laser welding process will be carried out in a water bath and / or underwater.

[0031] Preferably, it can be provided that, for welding the shear blade to the jaw element, the parameters of a laser welding process, preferably the frequency and / or the focusing, are adjusted such that the laser beam melts the shear blade in the area of ​​the contact point with the jaw element, whereby heat conduction and heat radiation cause the jaw element to melt at the contact surface and thus weld the jaw element to the shear blade.

[0032] It may be provided that the hand-held tool is designed as a folding pliers or sheet metal shears.

[0033] Preferably, it can be provided that each of the handle elements is formed in one piece with a jaw element.

[0034] Further advantages and details can be found in the figures and their accompanying descriptions. These show Fig. 1 - 6 a first design variant of a folding pliers, Fig. 7 - 12 different design variants of sheet metal shears, Fig. 13 a design variant of an iron braiding pliers, and Fig. 14 + 15 a further design variant of pliers.

[0035] The Figures 1 to 4 Figures 2 show different views of a first design variant of folding pliers. These folding pliers 2 comprise two handle elements 3, 4.

[0036] The handle elements 3, 4 are integrally integrated with the jaw elements 5, 6.

[0037] More precisely, the first handle element 3 is implemented as a single piece with the first jaw element 5, and the second handle element 4 is implemented as a single piece with the second jaw element 6.

[0038] The two handle elements 3, 4 are connected via the joint 7 so as to pivot about the axis of rotation 8.

[0039] In this embodiment, the joint 7 comprises a joint bolt 9, which passes through and connects the handle elements 3, 4 along the axis of rotation 8.

[0040] By pivoting the handle elements 3, 4 relative to each other, a gap between the jaw elements 5, 6 can be changed or the jaw elements 5, 6 can be placed against each other.

[0041] The two handle elements 3, 4 and the jaw elements 5, 6 formed in one piece with them are made of an aluminum alloy, and these components of this embodiment were manufactured by a drop forging process.

[0042] The Figures 5 and 6 show a detailed view of joint 7 of the first embodiment from the Figures 1 to 4 . This shows Figure 5 a side view and Figure 6 the in Figure 5 Indicative sectional view AA.

[0043] The pivot bolt 9 of this embodiment is (as shown by Figure 6 (as can be seen) designed as a screw, which screw is screwed to the first handle element 3 and is only mounted in the through hole in the second handle element 4 (but is rotatably mounted in the second handle element 4).

[0044] The pivot bolt 9 (more precisely: the screw) is connected to the inner ring 16 of the rolling bearing 14 via an interference fit. Thus, the first handle element 3 is connected to the inner ring 16 of the rolling bearing 14 via the pivot bolt 9.

[0045] The rolling bearing 14, more precisely the inner ring 16, is thus shrunk onto the joint bolt 9.

[0046] The rolling bearing 14 further has an outer ring 17, which outer ring 17 is mounted relative to the inner ring via the rolling elements and is mounted to rotate relative to the inner ring 16 about the axis of rotation 8.

[0047] The outer ring 17 is in turn connected to the second handle element 4.

[0048] The Figures 7 to 12 The images show different versions of sheet metal shears 1. These sheet metal shears 1 differ in individual details and design variations.

[0049] The Figures 7 to 10 The figures show frontal views of the sheet metal shears 1. It can be seen that the sheet metal shears 1 all have a first handle element 3 and a second handle element 4.

[0050] The first handle element 3 is integrally formed with a first jaw element 5, and the second handle element 4 is integrally formed with a second jaw element 6.

[0051] The handle elements 3 and 4 are pivotably connected to each other about an axis of rotation 8 by the joint 7. The joint 7 of these embodiments is in turn implemented by a pivot bolt 9.

[0052] The Figures 11 and 12Figure 1 shows a top view of two different embodiments of a sheet metal shear 1, showing different designs, thicknesses and thus stabilities of sheet metal shears 1.

[0053] The embodiments of Figures 7 to 12 are designed such that the joint 7 has a rolling bearing 14, wherein the first grip element 3 is connected to an inner ring 16 and the second grip element 4 to an outer ring 17 of the rolling bearing 14 (similar to the detailed view of the Figures 5 and 6 ).

[0054] To make the cutting edges or blades of the scissors more stable and wear-resistant, scissor blades 10, 11 were implemented, which are made of high-speed steel.

[0055] These shear blades 10, 11 are arranged on the jaw elements 5, 6 of the sheet metal shears 1, more precisely: connected to them by a laser welding process.

[0056] The Fig. 13 shows an exemplary embodiment of an iron braiding pliers 12.

[0057] This iron braiding pliers 12 in turn comprises two handle elements 3, 4. The handle elements 3, 4 are integrally connected to the jaw elements 5, 6.

[0058] The two handle elements 3, 4 are connected via the joint 7 so as to pivot about the axis of rotation 8.

[0059] The joint 7 in turn comprises a rolling bearing 14, wherein the first grip element 3 is connected to an inner ring 16 and the second grip element 4 to an outer ring 17 of the rolling bearing 14 (similar to the detailed view of the Figures 5 and 6 ).

[0060] The Figures 14 and 15 show an embodiment of a flat-nose pliers 15.

[0061] Fig. 14 represents the entire flat-nose pliers 15 and Fig. 15 A detailed view of the jaw elements 5, 6 and the joint 7.

[0062] The joint 7 in turn comprises a rolling bearing 14, wherein the first grip element 3 is connected to an inner ring 16 and the second grip element 4 to an outer ring 17 of the rolling bearing 14 (similar to the detailed view of the Figures 5 and 6 ). Reference symbol list:

[0063] 1. Tin scissors 2. Folding pliers 3. First handle element 4. Second handle element 5. First jaw element 6. Second jaw element 7. Joint 8. Rotation axis 9. Joint bolt 10. First scissor blade 11. Second scissor blade 12. Iron braiding pliers 13. Cutting pliers 14. Roller bearing 15. Flat-nose pliers 16. Inner ring of the roller bearing 17. Outer ring of the roller bearing

Claims

1. Hand-held tool comprising: - two handle elements (3, 4), each of which is connected to a jaw element (5, 6) in a movement-coupled manner, and - a joint (7), which joint (7) connects the two handle elements (3, 4) to each other pivotably about an axis of rotation (8), wherein a gap between the two jaw elements (5, 6) can be changed by pivoting the handle elements (3, 4) to each other or the jaw elements (5, 6) can be brought together by pivoting, characterized by the fact that the joint (7) has at least one rolling bearing (14), wherein a first grip element (3) of the two grip elements (3, 4) is connected to an inner ring (16) of the at least one rolling bearing (14) and a second grip element (4) of the two grip elements (3, 4) is connected to an outer ring (17) of the at least one rolling bearing (14) in a motion-coupled manner.

2. Tool according to claim 1, wherein the inner ring (16) of the rolling bearing (14) is formed integrally with the first handle element (3) and / or the outer ring (17) of the rolling bearing (14) is formed integrally with the second handle element (4).

3. Tool according to claim 1, wherein the at least one rolling bearing (14) is designed as a separate component and is preferably mounted on the two handle elements (3, 4) by a press fit.

4. Tool according to one of the preceding claims, wherein the at least one rolling bearing (14) is designed as a ball bearing, preferably a radial groove ball bearing.

5. Tool according to one of the preceding claims, wherein the two handle elements (3, 4) are made of an aluminum alloy, preferably wherein the aluminum alloy is material EN AW-7075.

6. Tool according to one of the preceding claims, wherein the joint (7) has a joint bolt (9) which joint bolt (9) connects the two handle elements (3, 4) to each other via the at least one rolling bearing (14), preferably which joint bolt (9) is made of the same material as the handle elements (3, 4).

7. Tool according to at least one of the preceding claims, wherein a shear blade (10, 11) is attached to each jaw element (5, 6), preferably by welding, particularly preferably by laser welding.

8. Tool according to claim 7, wherein the shear blades (10, 11) are made of a high-speed steel, preferably the material HS-6-5-2 C.

9. Tool according to at least one of the preceding claims, wherein the hand-held tool is designed as folding pliers (2) or sheet metal shears (1) or flat pliers (15).

10. Tool according to at least one of the preceding claims, wherein each of the handle elements (3, 4) is formed in one piece with a jaw element (5, 6).

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