Pipe cutting device

Abstract

The invention relates to a pipe cutting device (1) with a cutting blade (2), support rollers (3, 4) and a spindle (5), wherein the cutting blade (2) is accommodated in a first housing part (7) and the support rollers (3, 4) and the spindle (5) are accommodated in a second, L-shaped housing part (8), wherein the first housing part (7) is guided in the second housing part (8) for movement by means of the spindle (5) in a predetermined direction of movement (r), wherein, in addition, a spindle nut (6) connected to the first housing part (7) cooperates with the spindle (5), and the spindle nut (6) can be disengaged to achieve quick adjustment via a push button (31) projecting from the outside of the first housing part (7), wherein the spindle (5) is accommodated in a first L-shaped leg (9) of the second housing part (8) and the support rollers (3, 4) are arranged in a second L-leg (10).In order to further advantageously design a pipe cutting device of the type in question, it is proposed according to an inventive idea that the cutting blade (2) is arranged with a view to a superimposed arrangement between the push button (31) and the spindle (5).

Description

field of technology

[0001] The invention relates to a pipe cutting device with a cutting blade, support rollers and a spindle, wherein the cutting blade is accommodated in a first housing part and the support rollers and the spindle in a second, L-shaped housing part, wherein the first housing part is guided in the second housing part for movement by means of the spindle in a predetermined direction of movement, wherein in addition a spindle nut connected to the first housing part cooperates with the spindle and the spindle nut can be actuated via a push button protruding from the outside of the first housing part to achieve quick adjustability, wherein the spindle is accommodated in a first L-leg of the second housing part and the support rollers in a second L-leg running approximately at right angles to the first L-leg.

[0002] The invention also relates to a pipe cutting device with a cutting blade, support rollers and a spindle, wherein the cutting blade is accommodated in a first housing part and the support rollers and the spindle in a second housing part, wherein furthermore the first housing part is guided in the second housing part for movement by means of the spindle in a predetermined direction of movement.

[0003] Furthermore, the invention relates to a pipe cutting device with a cutting blade, support rollers and a spindle, wherein the cutting blade is accommodated in a first housing part and the support rollers and the spindle in a second housing part, wherein furthermore the first housing part is guided in the second housing part for movement by means of the spindle in a predetermined direction of movement and the cutting blade is arranged spring-loaded in the direction of movement by means of a spring. State of the art

[0004] Pipe cutting devices of the type in question are known in particular from sanitary installation technology and pipeline construction. Reference is made, for example, to US 1 945 949 A, WO 2020 / 074487A1 (US 2022 / 0001470 A1), or WO 2022 / 152845A1. With such a pipe cutting device, a pipe section made of, for example, mild steel, V2A, cast iron, brass, copper, or even a thermoplastic can be advantageously severed, preferably without chipping. In this case, a circumferential, circular cut is usually made in the circumferential direction of the pipe using at least one cutting blade. The active element can be a profile-wedge-shaped, hardened cutting blade, for example made of a high-speed steel, optionally of a hard metal.

[0005] It is also known to release the spindle nut from an otherwise conventional locking mechanism for quickly adjusting the opening width between the cutting blade and the support rollers, whereby the element serving for the locking mechanism, for example in the form of a push button, is exposed for manual operation. From the aforementioned US 1 945 949 A, it is known to arrange a lever-shaped push button at the end of the spindle and essentially in the extension of the spindle, via which the spindle nut can be influenced in such a way that, when actuated, it disengages from the spindle. Viewed in the longitudinal extension of the spindle, the push button is arranged opposite a rotary knob designed to rotate the spindle. Summary of the invention

[0006] In view of the above-described state of the art, the object is to further advantageously design a pipe cutting device of the type in question.

[0007] A possible solution to the problem is provided according to a first inventive idea in a pipe cutting device in which the cutting blade is arranged with a view to a superimposed arrangement between the push button and the spindle.

[0008] The selected stacked arrangement, or even a sequential arrangement, of the push button, cutting blade, and spindle, which stacked arrangement can occur essentially in the longitudinal direction of the first housing part, allows for advantageous handling of the pipe cutting device. The push button is arranged close to the cutting blade to be adjusted and is displaceably arranged in an area facing away from the spindle, for example on the first housing part. The second housing part, which accommodates the spindle, can actuate the push button alone as a counterweight for a user's hand, which would otherwise grip the pipe cutting device. Overall, the proposed design allows for ergonomically advantageous handling of the pipe cutting device.

[0009] The cutting blade can, in particular, be a cutting wheel. Where reference is made to a cutting wheel below, this also refers to a cutting blade in the more general sense, as long as the rotatability of the cutting blade as such is not important.

[0010] The quick adjustment allows for convenient positioning of the pipe cutter on the pipe to be cut. First, the pipe cutter is positioned with the opening enlarged and then the cutting wheel is guided along the spindle toward the pipe wall using its first housing section. For this purpose, the spindle nut can be designed to be ratcheted over to reduce the opening width. This is particularly useful in hard-to-reach areas. The push button, conveniently positioned as described above, can be used to increase the opening width, but also to reduce it, as an alternative to or in combination with the ratchet adjustment described above.

[0011] According to a further inventive concept, the object can be achieved in that the first housing part or the second housing part has a pointer element and in that the second housing part or the first housing part has a scale with a plurality of values arranged one behind the other in the direction of movement, wherein a distance between the cutting blade and the support rollers can be determined on the basis of a value of the scale to which the pointer element is assigned.

[0012] Advantageously, the provided scale and the pointer element create a display device, via which the clear distance between the cutting blade and the support rollers in a direction of movement of the first housing part relative to the second housing part can be determined. For example, values in the form of numbers and / or letters and / or symbols can be provided on the scale for this purpose. The display device can be used, for example, to determine a pipe diameter or to enable a preset, adapted, for example, to the outer diameter of the pipe to be cut.

[0013] According to a further inventive concept, the cutting blade can also be held by means of a cutting blade axis in a holding part movably received in the first housing part, wherein the spring is effective between the holding part and the first housing part.

[0014] This further inventive concept also provides a pipe cutting device that is advantageous in terms of handling. This allows, for example, the pipe cutting device to be applied to a pipe to be cut, in which case the pipe cutting device can be clamped to the pipe by means of the cutting blade, which is spring-loaded via the mounting part, and the opposing support rollers. The spring thus acts directly or, as is also preferred, indirectly via the mounting part on the cutting wheel, which is loaded essentially in the direction of the support rollers. The mobility of the cutting wheel axis, or of a bearing of the cutting blade in general, preferably together with the mounting part, is preferably limited by stops.

[0015] The holding part can be slidably received in the first housing part, preferably transversely to a longitudinal extent of the first housing part.

[0016] As far as the spring is concerned, it can be a conventional metal spring, for example in the form of a cylindrical compression spring, a leaf spring or a conical spring.

[0017] The features of the above-described independent claims are essential both individually and in any combination with each other, whereby further features of an independent claim can be combined with the features of another independent claim or with features of several independent claims, and further also with only individual features of one or more of the other independent claims.

[0018] For example, an advantageous pipe cutting device can be produced in which the cutting blade is arranged between the push button and the spindle with a view to being arranged one above the other and / or in which the first housing part or the second housing part has an indicator element and the second housing part or the first housing part has a scale with a plurality of values arranged one behind the other in the direction of movement, wherein a distance between the cutting blade and the support rollers can be determined on the basis of a value on the scale to which the indicator element is assigned and / or in which the cutting blade can be held by means of a cutting wheel axis in a holding part which is movably received in the first housing part, wherein the spring is effective between the holding part and the first housing part.

[0019] Further features are explained below, including in the description of the figures, often in their preferred relationship to the solution described in principle or to other features. However, they may also be important in their relationship to only individual features already described or to the respective further described feature, or each may be important independently.

[0020] Thus, according to one possible embodiment, a rotary knob connected to the spindle can be provided for fine adjustment, wherein the rotary knob is preferably provided protruding outwardly from the second L-shaped leg. For this purpose, the rotary knob is preferably connected to the spindle in a rotationally fixed manner, so that rotation of the rotary knob about the spindle axis leads to a movement of the spindle nut meshing with the spindle and the first housing part connected thereto along the spindle axis.

[0021] The rotary knob is preferably arranged protruding in the area of the second L-shaped leg of the second housing part, as an extension of the spindle, for ease of handling. The rotary knob can also be arranged in a transition area between the first L-shaped leg and the second L-shaped leg of the second housing part.

[0022] According to one possible embodiment, the push button for quickly adjusting the opening width can be movable approximately perpendicular to the direction of movement, preferably perpendicular to the orientation of the spindle. Furthermore, in a plan view of the pipe cutting device, in which plan view the spindle axis is represented as a line and the rotational axis of the cutting blade as a point, the push button can be aligned approximately perpendicular to the rotary knob.

[0023] Furthermore, a possible indirect or direct spring load on the cutting blade can, as preferred, act transversely to the direction of movement of the push button.

[0024] The push button can also have an extension. This preferably stem-like extension can extend through the first housing part and—viewed from the push button—project beyond the first housing part into the second housing part. By means of such an extension, the spindle nut can be acted upon via the push button for quick adjustment. The extension can further have a lower gripping section, with the spindle extending between the lower gripping section and the push button. When the push button is actuated, the lower gripping section can act on the spindle nut to release the engagement between the spindle nut and the spindle.

[0025] Viewed from the push button, the under-gripping section can reach behind or under the spindle, and viewed further from the push button, it can cross the area of the spindle.

[0026] In a further development, the lower gripping section can form the spindle nut. Thus, the lower gripping section can be provided directly with a thread or with a threaded section for meshing interaction with the spindle thread. To release the threaded engagement, the lower gripping section is moved, for example, linearly in a direction transverse to the spindle axis into a position spaced from the spindle.

[0027] The under-gripping section can also act on the spindle nut so that when the push button is actuated, for example, the spindle nut is moved into a disengaged position from the spindle as a result of a sliding or pivoting displacement.

[0028] Thus, according to one possible embodiment, the lower gripping section in the first housing part can act on a rocker part that forms the spindle nut. The action on the rocker part by the lower gripping section can, as is also preferred, be direct, such that upon actuation of the push button, the lower gripping section moves the rocker part toward a threaded engagement release position.

[0029] For this purpose, the rocker part can have a first rocker leg on one side of a rocker axis, which is designed to interact with the extension or the lower gripping section, and a second rocker leg on the other side of the rocker axis, which can be acted upon by a return spring. One of the rocker legs, for example the first rocker leg, can have a threaded portion for meshing interaction with the spindle thread. The threaded portion can also be provided in a section of the rocker part between the two rocker legs.

[0030] The return spring preferably acts on the rocker part in such a way that it is always loaded in the direction of the threaded engagement position and a displacement of the rocker part into the threaded engagement release position must occur against the return force of the spring.

[0031] Advantageously, the return spring can also preload the push button into a position corresponding to the engagement position of the spindle nut. This can result in a protrusion of the push button relative to a facing surface of the first housing part in the unloaded basic position.

[0032] According to a preferred embodiment, the push button is linearly movable together with the extension. The resulting direction of movement of the push button and the extension can, as further preferred, be directed transversely to the direction of movement of the first housing part and / or the orientation of the spindle axis.

[0033] The scale provided in one possible embodiment can have values typical for the plumbing sector, for example, typical pipe diameters of a pipe to be cut in millimeters and / or inches, furthermore, for example, 12 mm, 15 mm, or 22 mm, or even 3 / 8 inch, 1 / 2 inch, or 3 / 4 inch. A scale with several consecutive values in the direction of movement can be provided, for example, three or more up to, for example, ten or more values.

[0034] With regard to the spring-loaded cutting blade, it can further be provided that the spring is arranged in the direction of movement of the first housing part on the side of the cutting blade facing away from the support rollers and behind the support part. This can result in a linear displacement of the cutting blade or the support part supporting the cutting blade.

[0035] For this purpose, the mounting part can have a support section extending in the direction of the cutting wheel axis, which cooperates with the spring. Accordingly, the support section preferably extends between the cutting blade and an associated section of the first housing part. The spring loading the cutting blade preferably acts between the support section and the first housing part.

[0036] If a push button is provided for releasing the threaded engagement position between the spindle and the spindle nut, which push button has an extension extending through the first housing part into the second housing part, it can further be provided that the extension penetrates the mounting part. This can result in a penetration area that is essentially formed between the support section and the cutting blade. This penetration area is designed to enable the free linear mobility of the extension as well as the mounting part that accommodates the cutting blade.

[0037] The displacement direction of the holding part carrying the cutting blade can be directed transversely to a longitudinal extent or a displacement direction of the push-button-side extension, which can further preferably result in a displacement direction that is substantially parallel to the direction of movement of the first housing part. Short description of the drawings

[0038] The invention is explained below with reference to the accompanying drawings, which, however, only represent exemplary embodiments. A part that is explained only with reference to one of the exemplary embodiments and is not replaced by another part in another embodiment due to the special feature highlighted therein is described as a possible existing part. The drawing shows: Fig. 1 shows a perspective view of a pipe cutting device in a first embodiment; Fig. 2 the pipe cutting device of the first embodiment in a side view according to arrow II in Fig. 1; Fig. 3 the top view of the pipe cutting device according to arrow III in Fig. 2; Fig. 4 the pipe cutting device in a further side view according to arrow IV in Fig. 1; Fig. 5 the cut by the pipe cutting device along the line VV in Fig. 3; Fig. 6 the section along the line VI-VI in Fig. 5; Fig. 7 the section along the line VII-VII in Fig. 2; Fig. 8 a sectional view according to Fig. 5, but when a spindle engagement position is cancelled for quick adjustment of a cutting blade; Fig. 9 a sectional view according to Fig. 7, but the position according to Fig. 8 concerning; Fig. 10 a sectional view according to Fig. 8, but after a linear displacement of a first housing part carrying a cutting blade along the spindle; Fig. 11 section XI in Fig. 10, in the course of a ratchet-like overrun of a spindle thread engagement for displacing the first housing part; Fig. 12 a follow-up to Fig. 10, after resuming the engagement position in the displaced position of the cutting blade; Fig. 13 the pipe cutting device of the first embodiment in a perspective exploded view; Fig. 14 a sectional view according to Fig. 5, but relating to a second embodiment; Fig. 15 one of the Fig. 14 corresponding sectional view, when removing a spindle engagement position for quick adjustment of a cutting blade. Description of the embodiments

[0039] It is shown and described, initially with reference to the representations in the Fig. 1 and Fig. 13, a pipe cutting device 1 for cutting pipes, for example copper or brass pipes.

[0040] The pipe cutting device 1 is designed for one-handed operation. In particular, the dimensions of length a and / or width b, explained in more detail below, are each adapted to a hand width, particularly preferably between 4 and 12 cm.

[0041] Essential components of the pipe cutting device 1 are a cutting blade, optionally a cutting wheel 2, two support rollers 3, 4 and a spindle 5 with a spindle nut 6 designed for meshing interaction with the spindle 5. The listed components are accommodated in a preferably two-part housing, wherein the cutting blade 2 and the spindle nut 6 are positioned in a first housing part 7 and the spindle 5 and the support rollers 3, 4 are positioned in a second, substantially L-shaped housing part 8.

[0042] The pipe cutting device 1 has a compact design, which also allows one-handed operation, in particular for applying the pipe cutting device 1 to a pipe to be cut. Thus, a maximum length a, viewed in the direction of extension of the spindle 5, can be approximately 1.1 to 1.5 times, or even approximately 1.3 times, the width b viewed perpendicular thereto. Furthermore, a maximum length a of approximately 40 to 70 mm, or even approximately 60 mm, can be provided, which allows the pipe cutting device 1 to be gripped between the thumb and index finger of one hand for application to a pipe 63.

[0043] The thickness c of the pipe cutting device 1, considered transversely to the length a and to the width b, can correspond to approximately 0.4 to 0.6 times, further for example approximately 0.5 times, the largest length a to be set.

[0044] The second housing part 8 has two L-shaped legs extending essentially at right angles to one another, a first L-shaped leg 9 and a second L-shaped leg 10. The two support rollers 3 and 4 are rotatably mounted in the second L-shaped leg 10. The spindle 5 is rotatably received in the first L-shaped leg 9 and extends essentially in a first longitudinal extent L of the L-shaped leg 9. The geometric spindle axis x runs perpendicular to the mutually parallel rotational axes y of the support rollers 3 and 4.

[0045] As can be seen particularly from the presentation in Fig. 13, the support rollers 3 and 4 are each rotatable about axes 11 fixed in the second housing part 10 in bore-like receptacles 13, wherein a rolling bearing 12 can be interposed between the axis 11 and the support roller 3 or 4.

[0046] The first housing part 7, which essentially extends with its second longitudinal extension L' in parallel alignment to the second L-leg 10 of the second housing part 8, is linearly displaceable along the first L-leg 9 of the second housing part 8. This results in a direction of movement r, r' of the first housing part 7 in alignment with the spindle axis x or in the direction of the first longitudinal extension L of the first L-leg 9.

[0047] The sliding displaceability is achieved by a rail-like guide of the first housing part 7 on the first L-shaped leg 9 of the second housing part 8. For this purpose, a substantially T-shaped guide receptacle 14 can be formed in the L-shaped leg 9, extending in the direction of its longitudinal extension. This can result in two inwardly projecting and mutually facing guide webs 15, which engage in correspondingly adapted, edge-side guide grooves 16 of the first housing part 7.

[0048] A stop limit of the sliding displaceability of the first housing part 7 in the direction of a maximum spacing of this first housing part 7 from the second L-leg 10 of the second housing part 8 can be achieved by a locking pin 18 held in a cheek of the first L-leg 9 laterally delimiting the guide receptacle 14 and engaging with a free, inwardly directed end in a further locking groove 17 running parallel to one of the guide grooves 16.

[0049] The first housing part 7, together with the two L-legs 9 and 10 of the second housing part 8, delimits a cutting area S. This results in a three-sided limitation of the cutting area S by the housing part.

[0050] The housing parts 7 and 8, in particular also the L-legs 9 and 10 of the second housing part 8, are designed substantially U-shaped with respect to a cross-section transverse to the respective longitudinal extent L, L', with a respective U-opening pointing towards the cutting area S.

[0051] Through the U-shaped opening of the second L-leg 10, the support rollers 3 and 4 protrude freely into the cutting area S with a section of their circumferential surface (compare for example Fig. 2).

[0052] In the specific embodiment as a cutting wheel 2, the cutting blade accommodated in the first housing part 7 has a cutting wheel hub 19 with a geometric axis of rotation z, on which cutting wheel hub 19 the cutting plate 20 with the cutting edge 21, which runs circumferentially to the axis of rotation z, is arranged in a rotationally fixed manner.

[0053] The cutting blade 2 is supported on a cutting wheel axle 23 via the cutting wheel hub 19, preferably with the interposition of a further roller bearing 22.

[0054] The cutting wheel axis 23 can be fixed directly in the associated side walls of the substantially U-shaped first housing part 7. Such an alternative embodiment is exemplified in the Fig. 14 and Fig. 15 shown embodiment.

[0055] However, preference is given to Fig. 1 to 13 an embodiment in which the cutting blade 2 is held via the cutting wheel axis 23 in a holding part 24 which is received in the first housing part 7 transversely to its longitudinal orientation L' so as to be linearly movable.

[0056] Regardless of whether the cutting blade 2 is received directly on the first housing part 7 or indirectly via the holding part 24 in the first housing part 7, its axis of rotation z preferably extends in a spatially parallel alignment to the axes of rotation y of the support rollers 3 and 4.

[0057] The mounting part 24 can essentially have a U-shaped design, with a U-web extending in the direction of the cutting wheel axis 23 and forming a support section 25, from which U-legs extend parallel and spaced apart from one another in the form of mounting sections 26. The mounting sections 26 have recesses 27 for receiving the ends of the cutting wheel axis 23. The cutting wheel axis 23 can have a collar-like polygonal section 68 in the region of one end. The associated recess 27 is adapted to the polygonal circumference. The end of the cutting wheel axis 23 facing away from the polygonal section 68 can have a ball detent 69 for axially securing the axis in the usual usage position.

[0058] A spring 29, for example, and as also shown, in the form of a conical spring, is arranged between the support section 25 and the facing inner surface of a wall section 28 of the first housing part 7. This spring 29 is designed as a compression spring, which rests with one end on the inner surface of the wall section 28 and acts with the other end against the support section 25 of the mounting part 24, such that the mounting part 24, together with the cutting blade 2, is loaded in the direction of the cutting area S.

[0059] As a result of this design, the holding part 24 and, via this, the cutting blade 2 are held in a linearly deflectable manner in the direction of movement r, r' of the first housing part 7 against the restoring force of the spring 29.

[0060] By placing the inwardly facing surface of the support section 25 on a facing surface of a rod-like extension 30 passing through the support part 24 in the region of the U-opening, a stop is defined in an unloaded basic position of the support part 24.

[0061] The extension 30 forms the extension of a push button 31 and penetrates the first housing part 7 in its longitudinal extent L'. At its end, the extension 30 projects beyond the first housing part 7 into the region of the second housing part 8, in particular the first L-shaped leg 9 of the second housing part 8, with a lower gripping section 33 facing away from an actuating surface 32 of the push button 31.

[0062] The end region of the extension 30 forming the actuating surface 32 is exposed on the outside of the first housing part 7 for operation. From here, the extension 30 projects into the interior of the first housing part 7, passing through a slot-shaped opening 34 in the first housing part 7.

[0063] Furthermore, the extension 30 can be provided with two window-like openings 35 and 36. During normal use of the pipe cutting device 1, a portion of the spindle 5 protrudes through the smaller opening 36. A circumferential portion of the cutting blade 2 engages through the further opening 35.

[0064] The push button 31 is secured in the extension direction by a further locking pin 37, which is held in the wall section 28 of the first housing part 7 and with its inwardly directed end enters the larger opening 35. The transverse wall 38 of the extension 30, which separates the openings 35 and 36, engages in the extension direction in a stop-limiting manner against the locking pin 37 (see Fig. 5).

[0065] The spindle 5 is rotatably mounted about the spindle axis x in the region of one end on the second L-leg 10 of the second housing part 8. For this purpose, the L-leg 10 can have a sleeve-like bearing formation 39, in which a circular-cylindrical bearing section 40 of the spindle 5 is received.

[0066] Starting from this bearing section 40, the spindle 5 preferably extends freely, passing through the U-shaped space of the first L-leg 9 in the longitudinal direction L. Over this, possibly freely projecting, area, the spindle 5 is provided with an external thread 41.

[0067] The spindle 5 is secured in the axial direction, on the one hand, for example, by a collar 42 of the spindle 5 which is radially enlarged relative to the bearing section 40 and which is adjacent to the outside of the second L-leg 10, and on the other hand, for example, by the arrangement of a retaining ring 43 which, if necessary with the interposition of a disk 44, can be supported on the facing, inwardly facing end face of the bearing formation 39.

[0068] On the outside of the second L-leg 10, a rotary knob 45 is provided, which is connected to the spindle 5 in a rotationally fixed manner, by means of which a rotation of the spindle 5 about its spindle axis x can be achieved. For this purpose, the rotary knob 45 can have a polygonal receptacle 46, which receives a correspondingly shaped polygonal section 47 of the spindle 5, which adjoins the collar 42 axially on the outside.

[0069] The rotary knob 45 can be secured by means of a screw 48, which cooperates with an internal thread in the area of the polygonal section 47. As shown, a sleeve part 50, optionally supported on the spindle 5 via a further roller bearing 49, can also be provided for fastening.

[0070] The region of the free end 51 of the spindle 5 engages, preferably in each displacement position of the first housing part 7, in a transverse opening 52 extending transversely to the longitudinal extension L' in the first housing part 7.

[0071] In the longitudinal extension L' and thus extending transversely to the transverse opening 52, a further opening 53 is provided in the first housing part 7, through which the extension 30 extends, with the end-side lower gripping section 33 engaging behind the spindle 5—as viewed from the actuating surface 32 of the push button 31. For this purpose, the spindle 5 engages through the opening 36 of the extension 30.

[0072] To ensure smooth movement of the first housing part 7 along the second housing part 8, a sliding plate 54 can also be provided in the transverse opening 52. This can, for example, be a U-shaped bent sheet metal part.

[0073] The spindle nut 6 is arranged opposite a sliding surface of the sliding plate 54. This can be adjusted according to the Fig. 1 to 13, the rocker part 55 can be designed as a rocker part 55 which is pivotably received in the second housing part 8 about a geometric pivot axis u running transversely to the longitudinal extent L of the first L-leg 9.

[0074] The spindle nut 6, preferably the rocker part 55, has an engagement portion 56, which is provided with an internal thread portion 57 designed to match the external thread 41 of the spindle 5. The area of the internal thread portion 57 preferably extends over less than half the spindle circumference, for example, approximately 30 to 60 degrees, optionally up to 90 degrees of the circumference.

[0075] In the direction of extension of the spindle 5, adjacent to the engagement section 56, in an embodiment with the rocker part 55, a first rocker leg 58 is preferably formed in one piece, on which the lower gripping section 33 of the push button 31 can be supported.

[0076] Viewed in the longitudinal extension L, opposite the first rocker arm 58, a lever-like second rocker arm 59 is further formed on the engagement section 56. Via this second rocker arm, the rocker part 55, which can pivot about a rocker axis 60 centrally receiving the geometric pivot axis u, is supported on a return spring 61, which in the exemplary embodiment is designed as a cylindrical compression spring.

[0077] Both the rocker spindle 60 and the return spring 61 are supported in a section of the first housing part 7, the rocker spindle 60 being mounted on both ends in correspondingly positioned bores in the first housing part 7 and the return spring 61 being seated on an extension arm 62 directed substantially in the direction of the second leg 10 of the second housing part 8.

[0078] When the spindle 5 is rotated for the fine adjustment of the clear distance W in the cutting area S between the cutting edge 21 of the cutting blade 2 and the lateral surfaces of the support rollers 3 and 4, the external thread 41 of the spindle 5 meshes with the internal thread section 57 of the spindle nut 6, in particular of the rocker part 55, so that a rotation of the spindle 5 in one direction d causes a displacement of the first housing part 7 in a direction of movement r which increases the distance W viewed in the longitudinal extent L of the spindle 5 and a rotation in the opposite direction d' causes a displacement in the direction of movement r' which reduces the distance W.

[0079] The cutting blade 2, which is loaded in the direction of movement r via the spring 29, offers the advantage of a clamping effect when the pipe cutting device 1 is applied during cutting preparation. Thus, the pipe cutting device 1 is preferably applied to the pipe 63 to be cut with the cutting blade 2 in a pre-tensioned position, so that the device 1 can be held securely on the pipe 63. This offers particular advantages in hard-to-reach work areas.

[0080] The cutting process is carried out by continuously rotating the pipe cutting device 1 as a whole around the pipe 63, wherein the cutting wheel 2 in the direction of movement r can be readjusted after a certain number of revolutions, for example after every second, third or fourth revolution, as a result of rotating the spindle 2 in the direction of rotation d, so that the cutting blade 2 with its cutting edge 21 continuously digs into the pipe casing until it has finally completely severed the pipe casing.

[0081] In order to be able to move the cutting blade 2 and thus the entire first housing part 7 into a position further away from the second leg 10 of the second housing part 8 and thus to increase the distance W, the push button 31 is actuated (see arrow f in Fig. 8), such that the extension 30 is linearly displaced in the direction of the longitudinal extension L' of the first housing part 7, so that the first rocker leg 59 of the rocker part 55 is acted upon via the lower gripping section 33 - in the case of a design as a rocker part 55.

[0082] This action results in a displacement, possibly a pivoting of the rocker part 55 about its pivot axis u, against the restoring force of the return spring 61, so that the engagement section 56 with its internal thread section 57 comes out of engagement with the external thread 41 of the spindle 5 (compare Fig. 8). In this disengaged position, a quick adjustment of the first housing part 7 with its cutting blade 2 is possible, particularly in the direction of movement r' to increase the distance W, but also a quick adjustment in the opposite direction to reduce the distance W.

[0083] When the load on the push button 31 is removed, the return spring 61 moves the engaging part, and if applicable, the rocker part 55, and, via its first rocker arm 58, also the push button 31 back to the home position. The threaded engagement position is restored.

[0084] However, a quick adjustment to reduce the distance W is preferably also possible by ratcheting over the spindle thread engagement. For this purpose, the first housing part 7 can be pressed in the direction of movement r in a simple manner, whereby the flanks of the external and internal threads of spindle 5 and spindle nut 6 cause the rocker part 55 to pivot outward, overrunning the external thread 41, against the force of the return spring 61. The thread engagement position is automatically resumed at the end of the sliding displacement.

[0085] Such a ratchet-like overrun, however, is not possible in the direction of movement r' to increase the distance W, since, upon corresponding loading of the rocker part 55 in this direction, the first rocker leg 58 rests against the extension-side lower gripping section 33, which is prevented from moving in this loading direction by the locking pin 37 forming a stop. This also ensures the proper use of the pipe cutting device 1 during a pipe cutting process, in which the cutting blade 2 applies a load to the first housing part 7 and thus also to the spindle nut 6 or the rocker part 55 in the direction of movement r'.

[0086] In particular, the desired overrun capability can be achieved by a preferably trapezoidal cross-sectional design of the toothing of both the spindle and the spindle nut.

[0087] According to the Fig. 14 and Fig. In the second embodiment shown in Figure 15, the extension 30 of the push button 31 or the lower gripping section 33 can also directly form the spindle nut 6. For this purpose, the lower gripping section 33 can have a rigid extension arm 64 extending essentially in the longitudinal direction L, which, if appropriate, together with the lower gripping section 33, forms the engagement section 56 with the internal thread section 57.

[0088] By pressing the push button (see arrow f in Fig. 15), the area of the lower gripping section 33 forming the spindle nut 6 is lifted from the external thread 41 in a direction transverse to the spindle axis x. Here, too, the load on the arm 64 and the lower gripping section 33, via a return spring 61, leads to the resumption of the threaded engagement between the spindle 5 and the spindle nut 6 when the load on the push button 31 is removed.

[0089] The pipe cutting device 1 may further comprise a scale 65 with a pointer element 66 to assist the user in enabling a correct pre-adjustment of the distance W between the cutting blade 2 and the support rollers 3 and 4 as a function of the pipe diameter g of the pipe 63 to be cut.

[0090] The scale 65 can have values 67 arranged one behind the other at a distance in the direction of movement r, for example, as is also preferred, numerical values, further for example conventional diameter values for pipes 63 to be cut with the pipe cutting device 1 (for example 8 mm, 10 mm, 12 mm, 15 mm etc. or also 3 / 8 inch, 1 / 2 inch, 5 / 8 inch etc.).

[0091] The scale 65 is preferably provided on the outside along the first L-leg 9, whereby in one possible embodiment, such a scale 65 can also be provided on both sides of the leg 9. If the scales 65 are provided on both sides, they can have different values 67, for example, millimeter values on one side and inch values on the opposite side.

[0092] The pointer element 66 is preferably formed on the slidingly displaceable first housing part 7, further preferably forming a tip pointing in the direction of the values 67 of the scale 65.

[0093] If scales 65 are provided on both sides of the first L-leg 9, the first housing part 7 also carries a corresponding pointer element 66 on both sides. List of reference symbols 1 pipe cutter 2 cutting wheels 3 support roller 4 support rollers 5 spindle 6 spindle nut 7 first housing part 8 second housing part 9 first L-leg 10 second L-leg 11 Axis 12 rolling bearings 13 Recording 14 Lead recording 15 Guide bridge 16 guide groove 17 Locking groove 18 Locking pin 19 Cutting wheel hub 20 cutting plates 21 Cutting edge 22 rolling bearings 23 Cutting wheel axis 24 Bracket part 25 support section 26 Bracket section 27 Recess 28 wall section 29 spring 30 extension 31 push button 32 operating surface 33 Undergrip section 34 Opening 35 Breakthrough 36 Breakthrough 37 Locking pin 38 Cross wall 39 Bearing formation 40 storage section 41 external thread 42 collar 43 Retaining ring 44 disc 45 rotary knob 46 polygonal holder 47 polygonal section 48 screw 49 rolling bearings 50 sleeve part 51 End 52 transverse opening 53 Opening 54 sliding plate 55 Rocker part 56 intervention section 57 Internal thread section 58 first rocker leg 59 second rocker arm 60 rocker axle 61 Return spring 62 booms 63 pipe 64 booms 65 scale 66 Pointer element 67 Value 68 polygonal section 69 ball rest a length b width c Thickness d direction of rotation d' direction of rotation f arrow g pipe diameter r direction of movement r' direction of movement u Swivel axis x spindle axis y axis of rotation z axis of rotation L first longitudinal alignment L' second longitudinal alignment S cutting area W distance QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 1 945 949 A [0004, 0005] WO 2020 / 074487A1

[0004] US 2022 / 0001470 A1

[0004] WO 2022 / 152845A1

[0004]

Claims

[1] Pipe cutting device (1) with a cutting blade (2), support rollers (3, 4) and a spindle (5), wherein the cutting blade (2) is accommodated in a first housing part (7) and the support rollers (3, 4) and the spindle (5) are accommodated in a second, L-shaped housing part (8), wherein the first housing part (7) is guided in the second housing part (8) for movement by means of the spindle (5) in a predetermined direction of movement (r), wherein, in addition, a spindle nut (6) connected to the first housing part (7) cooperates with the spindle (5), and the spindle nut (6) can be actuated via a push button (31) projecting from the outside of the first housing part (7) in order to achieve quick adjustment, wherein the spindle (5) is accommodated in a first L-leg (9) of the second housing part (8) and the support rollers (3, 4) are arranged in a second L-legs (10), characterized bythat the cutting blade (2) is arranged so as to be superimposed between the push button (31) and the spindle (5). [2] Pipe cutting device according to claim 1, characterized by that a rotary knob (45) connected to the spindle (5) is provided for fine adjustment and that the rotary knob (45) is provided projecting outwards towards the second L-leg (10). [3] Pipe cutting device according to one of the preceding claims, characterized bythat the push button (31) is movable approximately perpendicular to the direction of movement (r), and / or that the push button (31) has an extension (30), that the extension (30) projects beyond the first housing part (7) into the second housing part (8), and that the extension (30) has a lower gripping section (33), wherein the spindle (5) runs between the lower gripping section (33) and the push button (31), and / or that the lower gripping section (33) forms the spindle nut (6), and / or that the lower gripping section (33) acts on the spindle nut (6), and / or that the lower gripping section (33) in the first housing part (7) acts on a rocker part (55) which forms the spindle nut (6). [4] Pipe cutting device according to one of the preceding claims, characterized bythat the rocker part (55) has on one side of a rocker axis (60) a first rocker arm (58) which interacts with the extension (30) and on the other side of the rocker axis (60) a second rocker arm (59) which is acted upon by a return spring (61), and / or that the return spring (61) pretensions the push button (31) into a position corresponding to an engaged position of the spindle nut (6) and / or that the push button (31) is linearly movable together with the extension (30). [5] Pipe cutting device (1) with a cutting blade (2), support rollers (3, 4) and a spindle (5), wherein the cutting blade (2) is accommodated in a first housing part (7) and the support rollers (3, 4) and the spindle (5) are accommodated in a second housing part (8), wherein furthermore the first housing part (7) is guided in the second housing part (8) for movement by means of the spindle (5) in a predetermined direction of movement (r), or pipe cutting device (1) according to one of claims 1 to 4, characterized by in that the first housing part (7) or the second housing part (8) has a pointer element (66) and in that the second housing part (8) or the first housing part (7) has a scale (65) with a plurality of values (67) arranged one behind the other in the direction of movement (r), wherein a distance (W) between the cutting blade (2) and the support rollers (3, 4) can be determined on the basis of a value (67) of the scale (65) to which the pointer element (66) is respectively assigned. [6] Pipe cutting device according to claim 5, characterized by that a value (67) corresponds to a pipe diameter (g) of a pipe (63) to be cut. [7] Pipe cutting device (1) with a cutting blade (2), support rollers (3, 4) and a spindle (5), wherein the cutting blade (2) is accommodated in a first housing part (7) and the support rollers (3, 4) and the spindle (5) are accommodated in a second housing part (8), wherein furthermore the first housing part (7) is guided in the second housing part (8) for movement by means of the spindle (5) in a predetermined direction of movement (r) and the cutting blade (2) is arranged spring-loaded in the direction of movement (r) by means of a spring (29), or pipe cutting device (1) according to one of claims 1 to 6, characterized bythat the cutting blade (2), optionally when designed as a cutting wheel by means of a cutting wheel axis (23), is held in a holding part (24) movably received in the first housing part (7) and that the spring (29) is effective between the holding part (24) and the first housing part (7). [8] Pipe cutting device according to claim 7, characterized by that the spring (29) is arranged in the direction of movement (r) on the side of the cutting blade (2) facing away from the support rollers (3, 4) and behind the holding part (24). [9] Pipe cutting device according to one of claims 7 or 8, characterized by that the holding part (24) has a support section (25) extending in the direction of a bearing of the cutting blade, optionally the cutting wheel axis (23), which cooperates with the spring (29). [10] Pipe cutting device according to one of claims 7 to 9, characterized bythat a push button (31) is provided and that the push button (31) has an extension (30) extending through the first housing part (7) into the second housing part (8), and / or that the extension (30) passes through the holding part (24).

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