Cutting tool

Abstract

The invention relates to a cutting tool (1) having two cutting parts (4, 5), wherein the cutting parts (4, 5) are connected to one another in a joint (10) for pivoting movement relative to one another along a cutting plane (E), wherein furthermore a first cutting part (4) is to be regarded as stationary and a second cutting part (5) is to be regarded as movable, which cutting parts (4, 5), in an open state, delimit a cutting mouth (M), wherein in addition the second cutting part (5) has two cutting edges (16, 17) which enclose an obtuse angle (ß) and come together in a cutting tip (19). In order to develop a cutting tool of the type in question, it is proposed that the cutting tip (19) is designed to protrude with respect to a linear progression of the cutting edges (16, 17) moreover in a pivot direction (r) of the second cutting part (5). The invention also relates to such a cutting tool in which in addition the second cutting part (5) can be driven by a ratchet drive (8) and consists of a ratchet part (15) with teeth (14) and a cutting edge part (18). According to a proposed development, the cutting edge part (18) is received in an exchangeable manner in the ratchet part (15).

Description

Description Cutting tool field of technology

[0001] The invention relates to a cutting tool with two cutting parts, wherein the cutting parts are connected to one another in a joint for pivoting movement relative to one another along a cutting plane, wherein a first cutting part is to be regarded as stationary and a second cutting part as movable, which cutting parts delimit a cutting mouth in an open state, wherein moreover the second cutting part has two cutting edges which enclose an obtuse angle with one another and which converge in a cutting tip.

[0002] The invention further relates to a cutting tool with two cutting parts, wherein the cutting parts are connected to one another in a joint for pivoting movement relative to one another along a cutting plane, wherein a first cutting part is to be regarded as stationary and a second cutting part as movable, which cutting parts delimit a cutting mouth in an open state, wherein moreover the second cutting part is drivable via a ratchet drive and consists of a ratchet part provided with a toothing and a cutting edge part. State of the art

[0003] Cutting tools of the type in question are known in various designs, for example for cutting pipes, particularly plastic pipes, or electrical cables, particularly underground cables. The cutting parts of the cutting tool that define the cutting mouth can each be designed like a knife. Designs are also known in which only one cutting part part, in particular a movable cutting part, is designed like a knife. The other cutting part can only serve to support the material being cut in the area of ​​the cutting mouth.

[0004] Such a cutting tool is known from US 2020 / 0016670 A1, in which the movable cutting part has two cutting edges that converge at an obtuse angle to form a cutting tip. Further information on the prior art can be found in DE 29701 450 U1, for example. Summary of the invention

[0005] Starting from a state of the art, as initially mentioned by way of example, the task arises of advantageously developing a cutting tool of the type in question.

[0006] A possible solution to the problem is provided according to a first inventive idea in a cutting tool in which the second cutting part is pivotable and in that the cutting tip is designed to protrude by a projection amount in a pivoting direction of the second cutting part compared to a linear course of the cutting edges.

[0007] Due to the cutting tip being exposed relative to the cutting edges, an advantageously designed cutting tool is created. The cutting tip being exposed in the pivoting direction, starting from an open cutting jaw position towards a closed cutting jaw position, results in a favorable cutting path when cutting through a material to be cut, with advantageous handling of the cutting tool. When cutting a material to be cut, a cutting tool without such a projecting cutting tip results in a (first) penetration of the second cutting part through or into the wall of the material to be cut before the linear cutting edges follow, this furthermore advantageously with reduced expenditure of force.

[0008] Due to the effect of the cutting tip on the material to be cut, at least at the beginning of the cutting process, an initially approximately point-like load on the outer wall of the material to be cut can occur through the cutting tip, which can result in a force introduction that promotes the cutting effect.

[0009] According to a further inventive idea, a possible solution to the problem can be provided by a cutting tool in which the cutting edge part is interchangeably received in the ratchet part.

[0010] Due to the interchangeability of the cutting edge part, the cutting tool is advantageously further developed. Compared to the one-piece designs of cutting edge part and ratchet part known from the prior art, the proposed solution simplifies the desired replacement of the cutting part. Such a replacement may be necessary, for example, if the cutting edge(s) are blunt or to adapt the cutting part to the material to be cut. This does not require a complete replacement, including the ratchet part with the toothing for the ratchet drive.

[0011] Furthermore, this essentially two-part design of the cutting part allows for favorable manufacturing of the cutting edge part. This can be manufactured independently of the ratchet part, possibly also with regard to the choice of material.

[0012] The features of the above-described independent claims are significant both individually and in any combination with each other, whereby further features of an independent claim can be combined with the features of the further independent claim, and further also with only individual features of one or more of the independent claims.

[0013] For example, a cutting tool can be provided whose cutting tip is designed to protrude in a pivoting direction of the second cutting part relative to a linear course of the cutting edges, wherein the second cutting part is essentially composed of a ratchet part and a cutting edge part, wherein the cutting edge part is interchangeably received in the ratchet part.

[0014] Further features are explained below, including in the description of the figures, often in their preferred association with one or more of the solutions described in principle or with further features. However, they may also be important in association with only individual features already described or with the respective further described feature, or each may be important independently.

[0015] The obtuse angle that the cutting edges of the second cutting part enclose with each other in a view in which a geometric pivot axis of the second cutting part is represented as a point can be determined according to a preferred embodiment may be more than 181°, for example more than about 185° up to, for example, about 240°, more preferably about 205 to 215°.

[0016] The cutting tip, which protrudes in the pivoting direction of the second cutting part, can advantageously have two pointed cutting edges that can form an acute angle with each other with reference to the view described above. Thus, an angle of less than 89° can be established in this regard, more preferably from less than approximately 85° up to, for example, approximately 70°.

[0017] In a further possible embodiment, the tip cutting edges can enclose an obtuse angle of more than 90° to one another, for example an angle of approximately 95 or 100° or more, for example up to approximately 120°.

[0018] The cutting edges can extend straight into each other, forming a point-like tip. In a further possible configuration, however, the cutting tip can also be rounded. The cutting edges then merge into each other, including a circular segment.

[0019] These tip cutting edges, which laterally delimit the cutting tip, preferably extend from the tip intersection point of the tip cutting edges into a transition area to the respectively adjoining, otherwise essentially linearly extending cutting edges.

[0020] One or both tip cutting edges can transition into the adjacent linear cutting edge via a cutting edge rounding. This rounded transition area can, as is preferred, be shaped like a cutting edge, just like the adjacent cutting edge or the tip cutting edge, so that a cutting effect can also be achieved in the area of ​​this cutting edge rounding.

[0021] The protrusion of the cutting tip relative to an intersection point of the extended, linearly extending cutting edges can correspond to approximately 0.05 to 0.2 times the length of the cutting edge extending linearly to a free end of the second cutting part. This can result in a protrusion of the cutting tip of, for example, more than 1 mm, more preferably more than approximately 1.5 mm, up to, for example, approximately 5 mm or more, further, for example, 2 to 4 mm.

[0022] The cutting tool can be a pipe cutting tool, with the first cutting part being designed as a receiving part for a pipe to be cut. Such pipe cutting tools are particularly used for cutting plastic pipes.

[0023] During a cutting process with pivoting of the second cutting part, according to a preferred embodiment, the cutting tip penetrates into the outer surface of the pipe in advance of the linearly extending cutting edges and, during the continuation of the cutting process, also penetrates into the inner surface of the pipe in advance of the areas of the linearly extending cutting edges that are essentially directly adjacent to the tip cutting edges, if necessary directly to the provided cutting edge roundings. This results in both a first cutting of the Depending on the material being cut, both the penetration of the second cutting part into the outer surface of the pipe and the emergence of the second cutting part from the inside of the pipe to the outside result in a point-like load on the pipe wall induced by the cutting tip. Starting from this point-like penetration position of the cutting tip into the outer surface of the pipe or the inner surface of the pipe, further pivoting of the second cutting part results in a respective cutting path on both sides in opposite directions in the circumferential direction of the pipe.

[0024] As a result of the pivoting of the cutting tip on a circular line, when it penetrates the outer surface and / or the inner surface of the pipe, it preferably initially cuts into the pipe essentially only with the one tip cutting edge facing the circle center. As the cutting tip pivots further, this tip cutting edge is preferably followed by the associated cutting edge rounding and the subsequent section of the linear cutting edge. At the same time, after the tip cutting edge facing the circle center has penetrated, as the cutting tip pivots further, the tip cutting edge facing away from the circle center can cut into the outer and / or inner surface, followed by the subsequent cutting edge rounding and the subsequent linear cutting edge.Accordingly, when the cutting tip penetrates the respective surface of the material to be cut, a cutting path is created starting from the cutting tip on both sides in opposite directions in the circumferential direction.

[0025] With an interchangeable receptacle of the cutting edge part in the ratchet part, a positive-locking receptacle for a portion of the cutting edge part can be formed in the ratchet part. The positive-locking receptacle can, as is also preferred, support the cutting edge part, in particular re during a pivoting displacement of the second cutting part in the cutting direction. The received portion of the cutting edge part is preferably the end portion of the cutting edge part facing away from the free end.

[0026] The cutting edge part can be connected to the ratchet part, for example, by screwing. A plug-in / snap-in connection can also be provided.

[0027] In a further embodiment, the positive-locking receptacle can be designed as a receiving pocket. This can result in a receiving opening, for example, a slot-shaped opening, directed in the direction of extension of the cutting edge part to be received. Particularly in the received positive-locking position, the relevant end of the cutting edge part is preferably completely enclosed in the receiving pocket, with the exception of the cutting-effective region of the cutting edge part extending beyond the receiving opening.

[0028] The receiving pocket can be formed by a corresponding slot-shaped recess in the ratchet part. In an alternative embodiment, and as is also preferred, the receiving pocket can be formed by a depression in the ratchet part, which depression can be covered by a cover part—preferably after receiving the corresponding end section of the cutting edge part.

[0029] The cover part can be separately attached to the ratchet part. A preferred embodiment is one in which, when the cutting edge part is secured to the ratchet part via a screw connection, the screw is simultaneously used to secure the cover part in the covering position.

[0030] The cutting edge part can have a substantially rectangular outline in the area accommodated in the form-fitting receptacle, with respect to a view in which the geometric pivot axis is represented as a point. The form-fitting receptacle, such as the recess in the ratchet part, can be configured with an adapted rectangular outline, thus essentially providing a form-fitting receptacle.

[0031] The form-fitting receptacle can have two opposite longitudinal edges, which can be of different lengths. Thus, one longitudinal edge, for example, the first longitudinal edge viewed in the cutting pivot direction, can have a length that corresponds to approximately 4 to 8 times, or furthermore, approximately 6 to 7 times, the length of the second longitudinal edge.

[0032] The above-described longitudinal edges of the form-fitting receptacle can be aligned in a secant-like manner with respect to an imaginary pivoting circle around the center of the circle, for example, with respect to the pivoting circle passing through the cutting tip. The two longitudinal edges can be aligned at least substantially parallel to each other, as is also preferred.

[0033] The ranges or value ranges or multiple ranges specified above and below also include, with regard to the disclosure, all intermediate values, in particular in 1 / 10th steps of the respective dimension, and therefore, if applicable, dimensionless. For example, the specification 100 to 110° also includes the disclosure of 100.1 to 110°, 100 to 109.9°, 100.1 to 109.9° etc., the revelation of 2 to 4 mm also the revelation of 2.1 to 4 mm, 2 to 3.9 mm, 2.1 to 3.9 mm etc., the revelation of 4 to 8-fold also the disclosure of 4.1 to 8-fold, 4 to 7.9-fold, 4.1 to 7.9-fold, etc. This disclosure can serve, on the one hand, to delimit a stated range limit from below and / or above, but alternatively or additionally also to disclose one or more singular values ​​from a respectively specified range. Short description of the drawings

[0034] The invention is explained in more detail below using exemplary embodiments. They show: Fig. 1 shows the cutting tool in view, relating to a first embodiment; Fig. 2 the front view against the cutting tool according to arrow II in Figure 1; Fig. 3 shows the cutting tool of the first embodiment, schematically illustrating the application; Fig. 4 shows the cutting tool according to Figure 1 in a partially sectioned side view, relating to a pivoted-out basic position of a second cutting part, when receiving a cutting material in a cutting mouth; Fig. 5 an intermediate position during a cutting pivoting displacement of the second cutting part; Fig. 6 shows the enlarged area VI in Figure 5; Fig. 7 is a follow-up view to Fig. 5 with further pivoting displacement of the second cutting part; Fig. 8 shows the enlarged area VIII in Figure 7; Fig. 9 is a follow-up view to Fig. 7 with further pivoting displacement of the second cutting part; Fig. 10 is a follow-up view to Fig. 9 with further pivoting displacement of the second cutting part; Fig. 11 shows the enlarged area XI in Figure 10; Fig. 12 is a follow-up view to Figure 10, concerning the cutting end position; Fig. 13 a cutting edge part of the second cutting part in an individual representation; Fig. 13a is a representation according to Figure 13, concerning an alternative Design; Fig. 14 the cutting edge part and a ratchet part in perspective exploded view; Fig. 15 shows the section in plane XV in Figure 14 with the cutting edge part accommodated in a form-fitting receptacle of the ratchet part; Fig. 16 is a sectional view according to Figure 15, but with the cutting edge part removed; Fig. 17 the view towards the second cutting part composed of the cutting edge part and the ratchet part according to arrow XVII in Figure 14; Fig. 18 shows the section along the line XVIII-XVIII in Figure 17; Fig. 19 is a sectional view according to Figure 18, but with the cutting edge part removed; Fig. 20 shows a perspective exploded view of the second cutting part of a cutting tool in a second embodiment. Description of the embodiments

[0035] Shown and described is a manually operable cutting tool 1 with a first, fixed handle part 2 and a second, pivotable handle part 3 as well as a first, fixed cutting part 4 and a second cutting part 5 pivotable relative to the cutting part 4.

[0036] Figures 1 to 19 show a first embodiment of the cutting tool 1 in the form of a pipe cutting tool. Figure 20 shows a second embodiment with regard to the design of the second cutting part 5.

[0037] Starting from a preferably plate-like tool body 7, the first fixed handle part 2 extends preferably in one piece and more preferably of the same material. Substantially opposite to the handle part 2, the first fixed cutting part 4 also extends preferably in one piece and, more preferably, of the same material in the manner of a freely projecting leg.

[0038] As can be seen particularly from the illustration in Figure 2, two spaced-apart, preferably plate-shaped parts 6, in particular stamped parts, furthermore in particular stamped sheet steel parts, can form the tool body 7. These two parts 6 for forming the tool body 7 can be essentially identical and extend at a distance from one another in the direction of a geometric pivot axis x, which will be described below.

[0039] The second cutting part 5, which is movable about the pivot axis x, and preferably a ratchet drive 8 are essentially arranged between the parts 6 of the tool body 7. A facing end section of the second, pivotable handle part 3, which is preferably held on the tool body 7 via a pivot pin 9, also preferably engages in the space between the parts 6 of the tool body 7. A corresponding geometric pivot axis y preferably extends spatially parallel to the geometric pivot axis x in the joint 10 of the second cutting part 5.

[0040] The handle parts 2 and 3 can, as shown, each be provided with a handle cover 11.

[0041] In Figures 4 to 12, the front part 6 in the direction of view is not taken into account in the drawing solely for the purpose of clarifying the mechanics as well as the structure and mode of operation.

[0042] Furthermore, part of the rigid tool body 7 is a leg 12, which is also formed in one piece and more preferably of the same material as the respective part 6, which leg 12, together with the tool body 7 as such and the leg-like fixed cutting part 4, delimits a cutting mouth M that is essentially U-shaped with respect to a view in the direction of the extension of the pivot axis x. The two sections of the parts 6 forming the leg 12 can, as also shown, be overlapped by a cap 13, which is made, for example, of a plastic material.

[0043] The second, pivotable cutting part 5 can, as also shown, essentially consist of a ratchet part 15 having a toothing 14 on the outside along a peripheral edge viewed in the circumferential direction, and a cutting edge part 18 having straight-line cutting edges 16, 17. The cutting edges 16 and 17, which are arranged essentially one behind the other in the longitudinal extension L of the cutting edge part 18, form an obtuse angle a of approximately 190° to 210° with each other and converge in a cutting tip 19 pointing in the pivoting direction r (see Figure 13).

[0044] This results in a movement of the second cutting part 5 in a cutting plane E resulting between the parts 6 (see Figure 2).

[0045] The pivoting mobility of the second cutting part 5 can be limited by a stop, in particular in the basic position of the second cutting part 5 shown for example in Figures 1 to 4 due to the interaction kung of a guide pin 20 with a guide groove 21 left in the parts 6 of the tool body 7 and extending coaxially to the pivot axis x. In this stop-limited basic position, as is also preferred, the second cutting part 5, in particular the cutting edges 16 and 17 of the cutting edge part 18, can lie essentially completely between the partial sections of the tool body 7 forming the leg 12 in a protected hidden position.

[0046] During a pivoting displacement of the second cutting part 5, starting from the basic position in a pivoting direction r, the guide pin 20 passes through the guide groove 21. Even in a pivoting end position, as shown for example in Figure 12, a stop limit can be provided due to the guide pin 20 being in contact with the relevant end of the guide groove 21.

[0047] The pivoting displacement of the second cutting part 5 in the pivoting direction r takes place in the exemplary embodiment and preferably using the ratchet drive 8. For this purpose, the handle part 3 can be provided with a feed lever 22 pivotally mounted thereon. This feed lever 22 engages with a feed finger 23 that is free at one end into the toothing 14 of the ratchet part 15. A pivoting displacement of the second handle part 3 in the direction of the handle part 2, which is fixed relative thereto, leads to a partial pivoting displacement of the second cutting part 5 via the engagement of the feed finger 23 in the toothing 14.A locking lever 24, which is further pivotally mounted on the tool body 7, in particular between the parts 6, prevents, with a locking finger 25 which also engages in the toothing 14, a backward displacement of the pivotable cutting part 5 against the pivoting direction r, so that even with pivoting return of the movable handle part 3 in a direction relative to the fixed one. Handle part 2 distanced pivoting position the second cutting part 5 remains in the previously reached pivoting position.

[0048] Both the feed lever 22 and the locking lever 24 are loaded in the usual way into the engagement position with the toothing 14 via springs, in particular leg springs, such as the leg spring 26 of the locking lever 24. The respective spring acts with one spring leg on the associated lever, while the other leg of the spring is preferably supported on the rigid tool body 7.

[0049] The feed displacement of the second cutting part 5 in the pivoting direction r occurs counter to the force of a return spring 27 acting on the second cutting part 5. Thus, as also shown, a leg spring can be provided in this context, which is supported with one leg on the rigid tool body 7 and acts with the other spring leg on the guide pin 20 counter to the pivoting direction r.

[0050] During the feed displacement of the second cutting part 5 in the pivoting direction r, the cutting edge part 18, in particular, passes through at least a partial section, further in particular with a free end 28 of the cutting edge part 18, an entry slot 29 resulting between the legs of the tool body 7 forming the first, fixed cutting part 4. This entry slot 29 can, as is also preferred, be provided due to the spaced-apart course of the parts 6 as a whole (see Figure 2).

[0051] Further preferably, the movable cutting part 5, including the free end 28 of the cutting edge part 18, does not extend in the course of the feed displacement and entry or passage through the entry slot 29 outside beyond the outer edge contour of the fixed cutting part 4, which results when viewed in the direction of the pivot axis x. Rather, in particular, the free end 28 in the insertion slot 29 is covered on both sides by the leg sections of the parts 6 forming the fixed cutting part 4.

[0052] The locking lever 24 can have an outwardly accessible handle 30 facing away from the locking finger 25, via which the locking lever 24 can be pivoted such that its locking finger 25 loses its engagement with the toothing 14 (see enlarged detail in Figure 12). The second cutting part 5 can then pivot back from the advanced position, acting via the return spring 27, with the feed finger 23 ratcheting overrun, into the home position, as shown, for example, in Figure 1.

[0053] In addition, the pivotable handle part 3 can be provided with a locking lever 31 which, in a locking position, can cooperate in a locking manner with a locking edge 32 of the tool body 7.

[0054] The cutting edge portion 18 is shown in a separate view in Figure 13. As can be seen, the linearly extending cutting edge 17 extends from the cutting tip 19 to the free end 28, while the likewise linearly extending cutting edge 16 extends from the cutting tip 19 only over a partial section of the cutting edge portion 18, leaving a cutting edge-free region 33 at the end of the cutting edge portion 18.

[0055] The cutting tip 19 is designed to protrude in the pivoting direction r relative to the linear course of the cutting edges 16 and 17. det (see also enlarged detailed view in Figure 13). This can result in a projection dimension a of the cutting tip 19 relative to an intersection point S of the extended, linearly extending cutting edges 16 and 17, which projection dimension a can correspond to approximately 0.05 to 0.1 times, furthermore, for example, approximately 0.07 times the length b of the cutting edge 17 extending linearly towards the free end 28 of the cutting edge part 18.

[0056] The cutting tip 19 merges on both sides in the direction of the respective cutting edge 16 or 17 into point cutting edges 34 and 35. These can, as shown, extend essentially in a straight line and can further enclose an acute angle ß of approximately 75 to 89°, further approximately 80 to 85° in a view in which the pivot axis x of the second cutting part 5 is represented as a point (see enlarged detail in Figure 13).

[0057] According to a further possible embodiment, the tip cutting edges 34 and 35 can also enclose an obtuse angle ß of more than 90° up to, for example, approximately 120°.

[0058] As can be seen further from the illustration in Figure 13a, the cutting tip 19 formed in the transition of the cutting edges 34 and 35 can also be rounded, for example having a radius R3 which can correspond to approximately 0.1 to 1 times, further for example approximately 0.4 to 0.6 times the projection dimension a.

[0059] According to the illustrated embodiments, both tip cutting edges 34 and 35 can be further rounded by a cutting edge rounding 36, 37 with a radius RI or R2, which is approximately 1.2 to 2 times wa can correspond to 1.5 times the board dimension a, into the associated cutting edge 16 or 17.

[0060] The first fixed cutting part 4 essentially serves as a receiving part 38 for supporting a material to be cut, for example a pipe 39 to be cut.

[0061] During the cutting process, in which the second cutting part 5 with its cutting edge part 18 is displaced in the pivoting direction r, the protruding cutting tip 19 initially advances toward the linearly extending cutting edges 16 and 17 and strikes the outer surface 40 of the pipe 39 (see Figures 5 and 6). This results in an approximately point-like force introduction via the cutting tip 19, which facilitates an initial penetration of the cutting tip 19 into the pipe wall 41 and a subsequent penetration of the cutting tip 19 with the cutting areas adjoining on both sides through the pipe wall 41.

[0062] As a result of the pivoting of the cutting tip 19 on a circular line k, upon penetration into the outer surface 40 or upon penetration through the pipe wall 41, the tip cutting edge 34, facing the circle center KM with respect to the pivot axis x, initially and essentially cuts the pipe 39, followed by the opposite tip cutting edge 35, both cutting edge curves 36 and 37, and the linearly extending cutting edges 16 and 17 (see also Figures 7 to 9). Upon the first penetration of the pipe wall 41, a cutting path originating from the cutting tip 19 on both sides in the circumferential direction results.

[0063] As the cutting process continues, the cutting tip 19 again advances to the directly adjacent cutting edges edges 34 and 35 adjoining areas of the cutting edges 16 and 17 into the inner surface 42 of the tube 39. Here, too, with the penetration of the tube wall 41 from the inside to the outside, a cutting path is produced starting from the cutting tip 19 on both sides in the circumferential direction, counteracting the cutting path otherwise brought about by the linear cutting edges 16 and 17 (compare Figures 10 to 12).

[0064] The cutting edge part 18 can be interchangeably received in the ratchet part 15. For this purpose, a positive connection is preferably provided between the cutting edge-free portion 33 of the cutting edge part 18 and a positive-locking receptacle 43 of the ratchet part 15.

[0065] According to the illustrations in Figures 14 to 19, according to the first embodiment shown there, the positive-locking receptacle 43 can be formed by a slot-shaped receiving pocket 45 opening openly into an edge surface 44 facing away from the toothing 14. The cutting edge part 18, with its partial area 33, can be inserted into the receiving pocket 45 through the slot opening. The inserted position can be secured by a screw 46, which screw 46 passes through an opening 47 in the ratchet part 15 and, penetrating a correspondingly positioned bore 48 in the partial area 33 of the cutting edge part 18 at the end of the screw shaft, engages in a threaded bore 49 formed in the cheek of the cutting edge part 18 (see in particular Figure 15).

[0066] In this first embodiment, the partial area 33 of the cutting edge part 18 received in the receiving pocket 45 is completely enclosed directly by the material of the ratchet part 15 - with the exception of the outlet opening of the receiving pocket 45.

[0067] According to the illustration in Figure 20, according to a second embodiment, the receiving pocket 45 can also be formed in the form of a depression 50 in the surface of the ratchet part 15, which depression 50 is covered, in particular in the holding position of the cutting edge part 18, by a preferably form-adapted cover part 51.

[0068] The partial area 33 of the cutting edge part 18 to be received in the receiving pocket 45 can have a substantially rectangular plan, with two opposite and preferably substantially parallel longitudinal edges 52 and a narrow edge 53 extending at an acute angle of approximately 45 to 60° to one of the longitudinal edges.

[0069] The form-fitting receptacle 43 or the receiving pocket 45 has a contour adapted to the shape of the partial area 33, with two opposite, essentially parallel longitudinal edges 54 and 55 and a transverse edge 56 adapted to the course of the narrow edge 53 of the partial area 33.

[0070] The longitudinal edges 54 and 55 are formed with different lengths, wherein the longitudinal edge 54 leading in the pivoting direction r can have a length c which can correspond to approximately 4 to 6 times, further approximately 5 times the length d of the further longitudinal edge 55 viewed in the same direction (compare for example Figure 19).

[0071] With regard to an imaginary swivel circle, for example given by the circular line K, the previously described longitudinal edges 54 and 55, if necessary in their imaginary extension, run in a secant-like manner (see Figure 18).

[0072] During a cutting process, the cutting edge part 18 is supported in particular via the leading longitudinal edge 52, further in particular via the end section of the longitudinal edge 52 facing the narrow edge 53 on the associated longitudinal edge 54 in the form-fitting receptacle 43. Alternatively or in combination therewith, during the cutting process, the narrow edge 53 can be supported accordingly on the associated transverse edge 56 of the form-fitting receptacle 43.

[0073] The above statements serve to explain the inventions covered by the application as a whole, which each independently develop the state of the art by at least the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0074] A cutting tool, characterized in that the cutting tip 19 is designed to protrude in a pivoting direction r of the second cutting part 5 relative to a linear course of the cutting edges 16, 17.

[0075] A cutting tool characterized in that the cutting tip 19 has two tip cutting edges 34, 35 which enclose an acute angle ß with each other.

[0076] A cutting tool characterized in that the tip cutting edges 34, 35 enclose an obtuse angle ß with each other.

[0077] A cutting tool characterized in that one or both tip cutting edges 34, 35 merge into the linear cutting edges 16, 17 via a cutting edge rounding 36, 37.

[0078] A cutting tool characterized in that the projection dimension a of the cutting tip 19 relative to an intersection point S of the extended linearly extending cutting edges 16, 17 corresponds to 0.05 to 0.2 times the length b of the cutting edge 17 extending linearly to a free end 28 of the second cutting part 5 facing away from the joint 10.

[0079] A cutting tool, characterized in that the cutting tool 1 is a pipe cutting tool and that the first cutting part 4 is designed as a receiving part 38 for a pipe 39 to be cut.

[0080] A cutting tool, which is characterized in that in the course of a cutting process with pivoting of the second cutting part 5 the cutting tip 19 initially penetrates into the outer surface 40 of the tube 39 in advance of the linearly extending cutting edges 16, 17 and in the course of the continuation of the cutting process in advance of the areas of the linearly extending cutting edges 16, 17 immediately adjoining the tip cutting edges 34, 35 into the inner surface 42 of the tube 39.

[0081] A cutting tool characterized in that the cutting tip 19, as a result of the pivoting on a circular line k, initially cuts into the pipe 39 essentially only with the one tip cutting edge 34 facing the circle center KM when penetrating the outer surface 40 and / or inner surface 42 of the pipe 39.

[0082] A cutting tool characterized in that the cutting edge part 18 is interchangeably received in the ratchet part 15.

[0083] A cutting tool, characterized in that a positive-locking receptacle 43 for a partial area 33 of the cutting edge part 18 is formed in the ratchet part 15.

[0084] A cutting tool characterized in that the cutting edge part 18 is screw-connected to the ratchet part 15.

[0085] A cutting tool characterized in that the form-fitting receptacle 43 is designed as a receiving pocket 45.

[0086] A cutting tool, characterized in that the receiving pocket 45 is formed by a recess 50 in the ratchet part 15, which recess 50 can be covered by a cover part 51.

[0087] A cutting tool, characterized in that the cutting edge part 18 has a substantially rectangular outline in its partial area 33 received in the form-fitting receptacle 43.

[0088] A cutting tool characterized in that the form-fitting receptacle 43 has two opposite longitudinal edges 54, 55 which are of different lengths.

[0089] A cutting tool characterized in that the longitudinal edges 54, 55 run in a secant-like manner with respect to an imaginary pivoting circle.

[0090] All disclosed features are (individually, but also in combination with each other) essential to the invention. The disclosure of the application hereby also includes the disclosure content of the associated / attached priority documents. documents (copy of the prior application) are included in full, also for the purpose of incorporating features of these documents into claims of the present application. The subclaims characterize, even without the features of a referenced claim, independent inventive developments of the prior art with their features, in particular in order to file divisional applications on the basis of these claims. The invention specified in each claim may additionally have one or more of the features provided in the above description, in particular with reference numbers and / or specified in the list of reference numbers. The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular insofar as they are clearly dispensable for the respective intended use or can be replaced by other technically equivalent means. List of reference symbols 1 cutting tool 29 entry slot 2 first handle part 30 handle 3 second handle part 31 locking lever 4 first cutting part 32 locking edge 5 second cutting part 33 sub-area 6 parts 34 tip cutting edge 7 tool body 35 tip cutting edge 8 ratchet drive 36 cutting edge rounding 9 pivot pin 37 cutting edge rounding 10 Joint 38 Receptacle 11 Handle cover 39 Tube 12 legs 40 outer surface 13 Cap 41 Pipe wall 14 Toothing 42 Inner surface 15 Ratchet part 43 Form-locking holder 16 Cutting edge 44 Edge surface 17 Cutting edge 45 Receiving pocket 18 Cutting edge part 46 Screw 19 Cutting tip 47 Opening 20 guide pin 48 bore 21 Guide groove 49 Threaded hole 22 Feed lever 50 recess 23 Feed finger 51 Cover part 24 locking lever 52 longitudinal edge 25 locking fingers 53 narrow edge 26 Leg spring 54 Longitudinal edge 27 Return spring 55 Longitudinal edge 28 free end 56 transverse edge a Projection dimension ß Angle b Length c Length d Length k Circular line r Ver Swivel direction x Swivel axis y Swivel axis E Cutting plane KM circle center L Longitudinal extension M cutting jaw RI Radius R2 radius R3 radius S Intersection a Angle

Claims

Claims 1. Cutting tool (1) with two cutting parts (4, 5), wherein the cutting parts (4, 5) are connected to one another in a joint (10) for pivoting movement relative to one another along a cutting plane (E), wherein a first cutting part (4) is to be regarded as stationary and a second cutting part (5) as movable, which cutting parts (4, 5) delimit a cutting mouth (M) in an open state, wherein, moreover, the second cutting part (5) has two cutting edges (16, 17) which enclose an obtuse angle (ß) with one another and which converge in a cutting tip (19), characterized in that the second cutting part (5) is pivotable and in that the cutting tip (19) is designed to protrude by a projection amount (a) in a pivoting direction (r) of the second cutting part (5) relative to a linear course of the cutting edges (16, 17).

2. Cutting tool according to claim 1, characterized in that the cutting tip (19) has two tip cutting edges (34, 35) which enclose an acute angle (ß) with one another.

3. Cutting tool according to claim 2, characterized in that the tip cutting edges (34, 35) enclose an obtuse angle (ß) with one another.

4. Cutting tool according to one of claims 2 or 3, characterized in that one or both tip cutting edges (34, 35) merge into the linear cutting edges (16, 17) via a cutting edge rounding (36, 37).

5. Cutting tool according to one of the preceding claims, characterized in that the projection dimension (a) of the cutting tip (19) relative to an intersection point (S) of the extended linearly extending cutting edges (16, 17) corresponds to 0.05 to 0.2 times the length (b) of the cutting edge (17) extending linearly to a free end (28) of the second cutting part (5) facing away from the joint (10).

6. Cutting tool according to one of the preceding claims, characterized in that the cutting tool (1) is a pipe cutting tool and that the first cutting part (4) is designed as a receiving part (38) for a pipe (39) to be cut.

7. Cutting tool according to one of claims 2 to 6, characterized in that in the course of a cutting process, with pivoting of the second cutting part (5), the cutting tip (19) initially penetrates into the outer surface (40) of the tube (39) in advance of the linearly extending cutting edges (16, 17) and in the course of the continuation of the cutting process in advance of the areas of the linearly extending cutting edges (16, 17) immediately adjoining the tip cutting edges (34, 35) into the inner surface (42) of the tube (39).

8. Cutting tool according to one of claims 2 to 7, characterized in that the cutting tip (19) as a result of the pivoting on a circular line (k) when penetrating the outer surface (40) and / or inner surface (42) of the pipe (39) initially cuts into the pipe (39) essentially only with the one tip cutting edge (34) facing the circle center (KM).

9. Cutting tool (1) with two cutting parts (4, 5), wherein the cutting parts (4, 5) are connected to one another in a joint (10) for pivoting movement relative to one another along a cutting plane (E), wherein a first cutting part (4) is to be regarded as stationary and a second cutting part (5) as movable, which cutting parts (4, 5) delimit a cutting mouth (M) in an open state, wherein, moreover, the second cutting part (5) is drivable via a ratchet drive (8) and consists of a ratchet part (15) provided with a toothing (14) and a cutting edge part (18), or cutting tool (1) according to one of claims 1 to 8, characterized in that the cutting edge part (18) is received in the ratchet part (15) in an exchangeable manner.

10. Cutting tool according to claim 9, characterized in that a positive locking receptacle (43) for a partial area (33) of the cutting edge part (18) is formed in the ratchet part (15) 11. Cutting tool according to claim 10, characterized in that the positive-locking receptacle (43) is designed as a receiving pocket (45).

12. Cutting tool according to claim 11, characterized in that the receiving pocket (45) is formed by a depression (50) in the ratchet part (15), which depression (50) can be covered by a cover part (51).

13. Cutting tool according to one of claims 9 to 12, characterized in that the cutting edge part (18) is screw-connected to the ratchet part (15).

14. Cutting tool according to one of claims 10 to 13, characterized in that the cutting edge part (18) has a substantially rectangular outline in its partial region (33) received in the form-fitting receptacle (43).

15. Cutting tool according to one of claims 9 to 14, characterized in that the form-fitting receptacle (43) has two opposite longitudinal edges (54, 55) of different lengths.

16. Cutting tool according to claim 15, characterized in that the longitudinal edges (54, 55) extend in a secant-like manner with respect to an imaginary pivoting circle.

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