EP3157718A1

EP3157718A1 - Apparatus and method for cutting plastic pipes

Info

Publication number: EP3157718A1
Application number: EP16753581.4A
Authority: EP
Inventors: Manfred Müller
Original assignee: SKS Welding Systems GmbH
Current assignee: SKS Welding Systems GmbH
Priority date: 2015-08-31
Filing date: 2016-07-29
Publication date: 2017-04-26
Anticipated expiration: 2036-07-29
Also published as: DE102015011394A1; DE102015011394B4; WO2017036571A1; EP3157718B1

Abstract

The invention relates to an apparatus (1) for cutting plastic pipes (6), in particular corrugated plastic pipes (6), comprising: a multi-part housing (2), having a first housing part (2a) and a second housing part (2b), which can be displaced relative to one another between an open position and a closed position, wherein the housing parts (2a, 2b) in the closed position form a pipe-receiving space (8) for at least partially receiving the plastic pipe (6); a multi-part cutting ring (20), which has a first cutting ring portion (20a) and a second cutting ring portion (20b), which are formed separately from one another and are arranged displaceably relative to the housing parts (2a, 2b), wherein the cutting ring portions (20a, 20b) in the closed position of the housing parts (2a, 2b) are arranged such that they extend around the pipe-receiving space (8), and wherein at least one of the cutting ring portions (20a, 20b) has a cutting blade (30) protruding radially inwards at least partially into the pipe-receiving space (8); and a driving device (22, 28; 44, 46) for driving the cutting ring (20) in rotation; wherein in the closed position of the housing parts (2a, 2b) the plastic pipe (6) can be fixed in the pipe-receiving space (8), and in the open position of the housing parts (2a, 2b) the plastic pipe (6) can be introduced substantially in the radial direction into the opened pipe-receiving space (8).

Description

"Apparatus and method for cutting plastic pipes"

description

The present invention relates to an apparatus and a method for cutting plastic pipes, in particular plastic corrugated pipes. When laying or installing plastic pipes, it is often necessary to cut plastic pipes and cut plastic pipe sections together. Preferably, the plastic pipe sections are welded together. In this case, it is important that the cut surfaces of the plastic pipe sections to be welded always run straight, so that they can fit cleanly together for good welding. This is particularly important in plastic corrugated pipes, as for a clean concern of the cut surfaces, the cuts must either run exclusively along a wave crest of the plastic corrugated pipe or exclusively along a wave trough of plastic corrugated pipe.

For cutting plastic pipes therefore cutting devices are used, which ensure a smooth and straight cut. However, the handling of conventional cutting devices for plastic pipes is expensive and the cost of such cutting devices is high.

It is therefore an object of the present invention to provide a device for cutting plastic pipes, which is easy to handle and inexpensive to produce, and to provide a corresponding method. This object is solved by the device and the method according to the independent claims. Preferred embodiments will be apparent from the dependent claims. According to one aspect of the invention, an apparatus for cutting plastic pipes, in particular plastic corrugated pipes, is provided, comprising: a multi-part housing, comprising a first housing part and a second housing part, which are displaceable relative to each other between an open position and a closed position, wherein the housing parts in the Closed position form a tube-receiving space for at least partially receiving the plastic tube; a multi-part cutting ring, comprising a first cutting ring portion and a second cutting ring portion, which are formed separately from each other and displaceable relative to the housing parts, wherein the Schneideringabschnitte are arranged in the closed position of the housing parts around the tube receiving space around and at least one of the Schneideringabschnitte a Having at least partially in the tube-receiving space radially inwardly projecting cutting blade; and drive means for rotationally driving the cutter ring; wherein in the closed position of the housing parts, the plastic tube is fixable in the tube receiving space, and in the open position of the housing parts, the plastic tube can be inserted substantially in the radial direction in the open tube receiving space.

Advantageously, the handling of the device is greatly simplified by the multi-part design of the housing and the cutting ring and thereby allowing radial insertion of the plastic tube into the tube receiving space. In particular, it is no longer necessary to introduce the plastic tube in the axial direction in the device and durchzustecken to the desired cutting position.

The device is used for cutting plastic pipes, in particular corrugated plastic pipes, where "cutting" means cutting through or cutting transversely to the axial direction of the plastic pipe. In the present application, reference is made to an axial direction or radial direction of the device according to the invention or the housing thereof is, so this is in the sense to understand a arranged in the tube receiving space plastic tube.

The housing may be formed substantially cylindrical in the closed position and may be divided along a horizontal plane in the first housing part and the second housing part. When directional indications such as "horizontal", "vertical", "lateral", etc. are made in the present application, this is to be understood in reference to a properly positioned device. In the closed position, the housing parts form a radially closed tube receiving space, which, however, is open in the axial direction, so that a plastic tube received therein can project from both ends of the tube receiving space. Receiving space is open at least laterally or in a radial direction, which allows insertion of the plastic tube substantially in the radial direction.

The cutting ring is preferably formed in two parts, wherein the first cutting ring portion and the second cutting ring portion can complement each other in the closed position to a circumferential cutting ring. The Schneideringabschnitte may be formed substantially mirror-symmetrical and may have an angular portion of about 180 °. The Schneideringabschnitte can be arranged displaceably in Schneideringführungen, which are formed in the housing parts, or performed. In particular, the Scheideringabschnitte may be rotatably mounted in the closed position about a central axis of the tube-receiving space or the cutting ring in the Schneideringführungen. The cutting ring may have a drive profile, whereby it can be driven by the drive device easier. In a basic position of the cutting ring relative to the housing parts of the first cutting ring portion, in particular exclusively, be arranged in the cutting ring of the first housing part, and the second Tailoring section can, in particular exclusively, be arranged in the cutting ring of the second housing part. The device can be designed such that the basic position of the cutting ring allows a displacement of the two housing parts from the closed position into the open position together with the cutting ring sections arranged therein, since in the basic position of the cutting ring the dividing lines of the housing parts and the cutting ring sections coincide.

The cutting blade is preferably arranged interchangeably on the at least one cutting ring section. The cutting blade may be connected to a cutting blade holder, which in turn is connectable to the cutting ring portion. The cutting blade holder may be formed manually replaceable. A plurality of cutting blade holders can be provided which can position the cutting blade at different depths of the tube receiving space to adapt the device to plastic tubes of various diameters. However, the cutting blade may also be integrally or integrally formed with the at least one cutting ring portion, or be attached thereto. The cutting blade is preferably arranged such that when closing the housing parts, ie when moving the housing parts from the open position to the closed position, the wall of the inserted into the tube receiving space plastic tube is pierced by the cutting blade. The cutting ring may have a plurality of cutting rings. In particular, both the first cutting ring section and the second cutting ring section can have one or more cutting blades. By providing a plurality of cutting blades, the necessary amount of rotation of the cutting ring for cutting the plastic pipe can be reduced.

The cutting ring is rotated in the closed position of the housing by means of the drive means to cut the plastic pipe. Here, the cutting blade or the cutting blades are moved by means of the cutting ring in the punched state along the circumference of the plastic tube until a continuous, circumferential cut in the plastic tube, or in the wall thereof, is produced. The drive device can be operated manually and / or electrically. However, it is also conceivable a hydraulic and / or pneumatic operation. The first cutting ring section and / or the second cutting ring section can be driven directly or indirectly.

In the closed position of the housing parts or of the housing, a plastic tube inserted into the tube receiving space is fixed and in particular positioned. For this purpose, the tube receiving space can be designed in accordance with the outer contour of the plastic tube to be cut, that is to say have a corresponding inner contour which enables positioning and fixing.

Preferably, the housing parts are articulated to each other, so that the housing parts are transverse to an axial direction of the housing between the open position and the closed position pivotally displaceable.

For this purpose, the housing parts can have at least one rotary joint or hinge joint, which couples the housing parts to one another at radial end sections. Thus, the housing parts can be easily opened or swung open to introduce the plastic tube in the radial direction in the housing substantially.

Preferably, the cutting ring is at least partially formed as a cutting tooth ring, and the first and / or the second cutting ring portion are at least partially formed as first and / or second cutting gear rim portions. The incisor ring can also be referred to as an incisor ring.

Advantageously, the at least partial formation of the cutting ring as a cutting-tooth ring enables simple driving of the cutting-ring.

The teeth of the cutting ring formed as a cutting ring are preferably arranged radially outboard. It may be in the gearing of the For example, cutting teeth ring act on a straight toothing, a helical toothing or even a bevel gear. The cutting ring can be driven by means of a gear, a pinion or a worm wheel of the drive device.

Preferably, the drive means comprises: a multi-part drive sprocket having a first drive sprocket portion and a second drive sprocket portion, which are formed separately from each other and displaceable relative to the housing parts, wherein the drive sprocket portions are disposed substantially around the cutting ring in the closed position of the housing parts; and an intermediate pinion which is disposed between the cutting ring and the drive sprocket and engages both teeth of the cutting ring and teeth of the drive sprocket; wherein the drive sprocket has an actuating element with which the drive sprocket is manually rotatably displaceable in order to rotationally displace the cutting ring via the intermediate sprocket.

Advantageously, the provision of the drive sprocket described above in combination with the intermediate pinion and the actuator in a simple manner allows easy manual driving of the device for cutting the plastic pipe.

The drive sprocket is preferably formed in two parts, wherein the first drive sprocket portion and the second drive sprocket portion can complement each other in the closed position to a rotating drive sprocket. The drive sprocket portions may be formed substantially mirror-symmetrical and may have an angular portion of about 180 °. The drive sprocket sections can be arranged displaceably in drive sprocket guides, which are formed in the housing halves. In particular, the drive sprocket portions in the closed position about a central axis of the tube-receiving space or the cutting ring or the Drive sprocket rotatably mounted in the drive sprocket guides. The teeth of the drive sprocket are preferably arranged radially inwardly. It may be the teeth of the drive sprocket, according to the teeth of the cutting ring and / or the intermediate pinion, for example, a spur toothing, a helical gearing or even a bevel gearing. By rotating the drive sprocket so the cutting ring can be driven in rotation via the intermediate pinion. It can also be provided two or more intermediate pinion. The drive sprocket or the drive sprocket sections are at least partially toothed over its circumference. The drive sprocket may also be referred to as a drive toothed ring.

In a basic position of the drive sprocket relative to the housing parts of the first drive sprocket portion, in particular exclusively, be arranged in the drive sprocket guide of the first housing part, and the second drive sprocket portion may, in particular exclusively, be arranged in the drive sprocket guide of the second housing part. The device can be designed such that the basic position of the cutting ring and the drive sprocket allows a displacement of the two housing parts from the closed position to the open position together with the Schneideringabschnitte and drive sprocket sections disposed therein, since in the initial position of the cutting ring and the drive sprocket, the dividing lines of the housing parts, the Tailoring sections and the drive sprocket sections coincide.

The toothing of the intermediate pinion can be, for example, a straight toothing, a helical toothing or else a bevel toothing. Preferably, the intermediate pinion, in particular exclusively, is mounted rotatably about its own axis in one of the housing parts. However, it can also be stored in each case one or more intermediate pinion in two housing parts.

The actuating element may be an actuating lever. This may be attached to one of the drive sprocket portions and extending in the radial direction out of the housing. In one or in both of the housing parts, a slot may be provided, in which the actuating lever is guided during rotation of the drive sprocket. The operating lever allows driving the cutting ring without much effort. However, the actuating element can also be, for example, an actuating crank or an actuating wheel.

Preferably, the numbers of teeth of the cutting ring, the drive sprocket and the intermediate pinion are set such that, in a rotational displacement of the drive sprocket, a rotation amount of the cutting ring is increased over a rotation amount of the drive sprocket.

Advantageously, this configuration makes it possible to produce a full cut through the plastic pipe with a small actuating travel of the actuating element. This ensures a particularly simple handling of the device.

The numbers of teeth can be adjusted, for example, so that during a rotation of the drive sprocket by about 135 ° of the cutting ring is rotated by about 190 °. The actuator can be designed or arranged so that is rotated at full actuation from one stop to the other stop the drive sprocket by about 135 °. Since the direction of rotation of the drive sprocket due to the Zwischenritzels opposite to the direction of rotation of the cutting ring, only the amounts of the rotations, ie regardless of their direction, considered here. With the provision of two cutting blades at two opposite positions of the cutting ring, a rotation of 180 ° would be sufficient to produce a complete cut in the plastic tube. In order to produce the cut with a certain degree of security, a rotation of the cutting ring by a little more than 180 °, for example 190 °, is preferred. Preferably, the numbers of teeth are set so that at a rotation amount of the drive sprocket from about 90 ° to about 150 ° Rotational amount of the cutting ring of at least about 180 ° results.

Preferably, the drive device comprises: a drive pinion; and an engine; wherein the drive pinion is engaged with the teeth of the cutting ring; and wherein the drive pinion is drivable by the motor to rotationally displace the cutting ring.

Advantageously, this configuration allows for easy handling of the device, since the cutting of the Kunststoffrohes can be done for example by pressing a button or by flipping a switch.

The engine is preferably an electric motor. However, it is also conceivable a hydraulic motor or a pneumatic motor. The motor is preferably mounted on or in one of the housing parts. The toothing of the drive pinion may be, for example, a straight toothing, a helical toothing or a bevel toothing according to the toothing of the cutting ring. The drive pinion is connected to the drive axle of the motor and is preferably, in particular exclusively, mounted rotatably about its own axis in one of the housing parts. The motor may have a control or regulating device which shuts off the motor after a rotation of the cutting ring of about 180 °. For detecting the position of the cutting ring, the device may have one or more sensors or buttons. Preferably, at least one of the housing parts has a positioning rib for axially positioning the plastic corrugated pipe in the pipe receiving space.

Advantageously, the positioning rib allows a precise axial positioning of the plastic corrugated pipe in the tube receiving space and prevents axial displacement of the plastic corrugated pipe when closing the housing and / or when cutting the plastic corrugated pipe. The positioning rib is formed on an inner surface of the tube accommodating space or the housing part, and protrudes into the tube accommodating space. The positioning rib may extend along at least a portion of the inner circumference of the tube receiving space. The positioning rib is configured to engage the recess of a corrugation of the plastic corrugated pipe. Preferably, the first housing part and the second housing part each have two or four positioning ribs, which are arranged individually or in pairs with the cutting ring therebetween. Preferably, the positioning rib is designed to position the plastic corrugated tube in the tube receiving space such that a section of the cutting blade runs exclusively along a wave crest of the plastic corrugated tube.

For a good connectivity, in particular Verschwel ßbarkeit, it is advantageous if the cut surfaces of the plastic corrugated pipe sections to be welded run as straight as possible, so that they can fit cleanly together. It is advantageous if the cut runs either exclusively along the wave crest of the plastic corrugated pipe or exclusively along the wave trough of the plastic corrugated pipe. A section along the wave crest is particularly advantageous because of the better accessibility in the welding and the larger welding surface. However, the positioning rib can also be designed to position the plastic corrugated tube in the tube receiving space such that a section of the cutting blade runs exclusively along a corrugation valley of the plastic corrugated tube.

Preferably, the housing has replaceable inserts for modifying the tube receiving space.

Advantageously, by providing the inserts, the device can be easily adapted to different plastic tube sizes and configurations. The inserts can be designed, for example, in the form of a half shell or a shell section. The housing parts may have receptacles for the inserts on their insides. The inner surfaces of the inserts can form the tube receiving space in the closed position. The first and second housing parts may each have two inserts interposed with the cutting ring. The positioning rib described above may be formed on at least one of the inserts, in particular integrally or integrally therewith. The inserts can be manually interchangeable.

Preferably, the first cutting ring portion and the second cutting ring portion each have a cutting blade projecting radially inwardly at least partially into the tube receiving space, the cutting blades being disposed substantially on two opposite sides of the cutting ring.

Advantageously, it is possible with this configuration, to produce a complete cut through the plastic tube by rotation of the cutting ring by only 180 °, since the cutting blades at two substantially diametrical positions of the cutting ring, so offset by about 180 °, are arranged on the cutting ring , Due to the cutting blade width, the cut is lengthened so that a cutting length of longer than 180 ° is achieved. This creates an overlap of the cuts and a complete separation of the plastic corrugated pipe is generated. Preferably, the cutting blade has a cutting blade guard; wherein the cutting blade protection is formed leaf spring-shaped and in the open position of the housing parts, the cutting blade is arranged concealing; wherein upon displacement of the housing parts from the open position to the closed position in the presence of the plastic tube in the tube receiving space, the cutting blade guard is pressed by an outer surface of the plastic tube against an inner wall of the tube receiving space, the cutting blade protruding through a slot in the cutting blade guard. Advantageously, injuries to the user or unwanted damage to the plastic pipe with the housing open are prevented by the cutting blade guard. The cutting blade guard may be formed as a wave-shaped bent sheet metal. The cutting blade guard may be connected to the cutting blade holder, if present.

According to a further aspect of the invention, there is provided a method of cutting plastic pipes, in particular plastic corrugated pipes, the method comprising the steps of: inserting the plastic pipe substantially in a radial direction into an open pipe receiving space of a multi-part housing in an open position; Relocating a first housing part and a second housing part of the housing relative to each other from the open position to a closed position, wherein in the closed position, the plastic tube is fixed in the tube-receiving space, separated from each other and formed relative to the housing parts displaceably arranged first and second cutting ring sections of a multi-part cutter rings are arranged to extend around the tube receiving space around, and pierces at least one cutting blade of the Schneideringabschnitte through a wall of the plastic tube and at least partially projects into the tube receiving space radially inwardly; and rotationally driving the cutting ring by means of drive means for forming a circumferential cut in the wall of the plastic pipe. The above explained in relation to the device according to the invention and the preferred embodiments thereof also applies correspondingly to the method according to the invention.

In the following, embodiments of the invention will be described in more detail with reference to the accompanying figures. It is understood that the present invention is not limited to these embodiments, and that individual features of the embodiments can be combined to form further embodiments. a perspective view of a device according to a first embodiment in an open position;

a perspective view of the device according to the first embodiment in a closed position;

a perspective view of the device according to the first embodiment in the open position, wherein a part of the device for better visibility is hidden;

Sectional views of the device according to the first embodiment during the cutting process;

a perspective view of a device according to a second embodiment in an open position;

a perspective view of the device according to the second embodiment in a closed position;

a perspective view of the device according to the second embodiment in the open position, wherein a part of the device for better visibility is hidden;

Sectional views of the device according to the second embodiment during the cutting process;

a sectional view of a device according to a third embodiment in a closed position;

a sectional view of the device according to the third embodiment in an open position;

an enlarged view of the hinge portion of the housing parts of Fig. 10;

an enlarged view of the hinge portion of the lower housing part of Fig. 10;

a perspective view of a preferred cutting blade holder; a sectional view of the cutting blade holder of FIG. 13;

the cutting blade holder of Figure 13 in a plan view. and Fig. 16 is a perspective view of a preferred insert.

Fig. 1 shows a perspective view of a device 1 according to a first embodiment in an open position, and Fig. 2 shows a perspective view of the same device 1 in the closed position. The housing 2 has a first housing part 2a and a second housing part 2b, which are arranged to be displaceable relative to one another via two hinge joints 4. The assignment "first" and "second" is arbitrary. The axis of rotation of the two hinge joints 4 extends parallel to the axial direction of the inserted into the device 1 plastic corrugated pipe 6 and the tube-receiving space. The housing parts 2a, 2b are displaced between the open position shown in FIG. 1 and the closed position shown in FIG. The second housing part 2b has two feet 10, by means of which the device can be placed on the floor and possibly screwed with this.

The first housing part 2a and the second housing part 2b each have a left housing part and a right housing part. In other words, the first and second housing part are each divided in the axial direction into two housing part sections, which are formed or manufactured separately. The two housing subsections have connecting flanges and are connected to each other by means of screws 11, the two housing subsections enclosing the separator ring 20 and the cutting ring sections 20a, 20b and the drive sprocket 22 and the drive sprocket sections 22a, 22b, respectively. The two housing part sections of the first housing part 2a form in their connection region, in particular on the radial peripheral region of the connecting flange, a slot 12, along which the rod of the actuating lever 14 can be moved. The two housing subsections of the first housing part 2a each have a locking clip 16 which, when the housing parts 2a, 2b are engaged, each latch with a locking edge 18 of the two housing subsections of the second housing part 2b.

The housing 2 may be made of plastic, in particular fiber-reinforced or unreinforced PA, PPO or POM. The housing parts 2a, 2b or the housing part sections can be easily produced by injection molding, wherein metallic reinforcements, such as pins or the like, can be overmolded.

Fig. 3 shows the device 1 in the open position, wherein the right housing part sections are hidden. The first cutting ring portion 20a of the cutting ring 20 and the first drive sprocket portion 22a of the drive sprocket 22 are displaceably arranged in the cutting ring 24 and the drive sprocket guide 26 of the first housing part 2a. Accordingly, in the state shown, the second cutting ring portion 20b of the cutting ring 20 and the second drive sprocket portion 22b of the drive sprocket 22 in the cutting ring 24 and the drive sprocket guide 26 of the second housing part 2b are arranged displaceably. This state can be referred to as the basic position of the cutting ring 20 and the drive sprocket 22. The Schneideringführung 24 and the drive sprocket guide 26 are formed by corresponding recesses on the end wall of the connecting flanges of the housing part sections. The intermediate pinions 28 are respectively disposed between the cutting ring portions 20a, 20b and the driving sprocket portions 22a, 22b, and are engaged with the teeth of both the cutting ring portion and the driving sprocket portion, respectively. The intermediate pinions 28 are rotatably mounted in the housing parts 2a, 2b, in particular between the housing part sections stored.

As well as the housing 2, the cutting ring 20, the drive sprocket 22 and / or the intermediate pinion 28 may be made of plastic, in particular fiber-reinforced or unreinforced PA, PPO or POM. The separating ring 20, the drive sprocket 22 and / or the intermediate pinion 28 can be easily produced by injection molding, wherein metallic reinforcements can be encapsulated. The cutting ring portions 20a, 20b each have a cutting blade 30 which is fixed by means of a cutting blade holder 32 to a radially inner side of the cutting ring portion. The cutting blades 30 are each covered by a Sch eidklingenschutz 34.

For forming the tube receiving space 8 and for positioning and fixing the plastic corrugated tube 6, the housing parts 2a, 2b exchangeable inserts 36 on. For each housing part section an insert 36 is provided. The inserts 36 are semi-cylindrical in shape and have outboard mounting ribs 38 which can be inserted into corresponding mounting slots 40 on an inner surface of the housing member to position the inserts 36. On the inside of the inserts 36, two positioning ribs 42 for axially positioning the plastic corrugated tube 6 in the tube receiving space 8 are formed near the cutter ring 20. The positioning ribs 42 are arranged in such a way that a corrugation peak of the plastic corrugated pipe 6 can be arranged lying on both sides between the positioning ribs 42.

As well as the housing 2, the separating ring 20, the drive sprocket 22 and / or the intermediate pinion 28 and the inserts 36 may be made of plastic, in particular fiber-reinforced or unreinforced PA, PPO or POM. The inserts 36 can be easily manufactured by injection molding, wherein metallic reinforcements can be encapsulated. Fig. 4 shows sectional views of the device 1 at various stages during the cutting process. Fig. 4 (a) shows the device 1 in the open position with an already inserted plastic corrugated pipe 6. In the present case, the plastic corrugated pipe 6 was inserted into the open pipe receiving space 8 such that the cutting blade 30 of the second cutting ring portion 20 b already through the wall of the Plastic corrugated pipe 6 is pierced. Fig. 4 (b) shows the state after the device 1 has been closed and is in the closed position. When closing pierces the cutting blade 30 of the first cutting ring portion 20a, the wall of the plastic corrugated pipe 6, and the locking clips 16 lock the device 1 and the housing parts 2a, 2b in the closed position. In Fig. 4 (c), the operating lever 14 and thus also the drive sprocket 22 has been displaced from the home position counterclockwise by about 20 °. As a result, the cutting ring 20 and the cutting blades 30 thereof on the intermediate pinion 28 was shifted by about 28 ° clockwise. In Fig. 4 (d), the operating lever and thus also the drive sprocket 22 has been displaced from the initial position to the stop by about 135 ° counterclockwise. This leads to a displacement of the cutting ring 20 and the cutting blades 30 in a clockwise direction of about 190 ° from the initial position, whereby a complete cut is produced by the plastic corrugated pipe 6. In this position, as well as in all intermediate positions, can not be opened as the drive sprocket locks immediately. Thereafter, the actuating lever 14 can be moved back to the starting position in a clockwise direction, and the device 1 can be opened for pipe removal.

Fig. 5 shows a perspective view of a device 1 according to a second embodiment in an open position, and Fig. 6 shows a perspective view of the same device 1 in the closed position. Fig. 7 shows the device 1 of the second embodiment in the open position, wherein the right housing part sections are hidden. The device 1 according to the second embodiment differs from that of the first embodiment in that the drive of the cutting ring 20 is made via the drive pinion 44, which is driven by the electric motor 46. By omitting the drive sprocket and the actuating lever, the device 1 can be made more compact in the radial direction.

The device 1 is adapted in the second embodiment for cutting a plastic corrugated pipe 6 with a large diameter. For this purpose, thin-walled inserts 36 were used, which form a large tube-receiving space. Further, the cutting blades 30 were positioned by means of respective cutting blade holders 32. In the same way can the Device of the first embodiment can be adapted to plastic tube of larger diameter.

Fig. 8 shows sectional views of the device 1 of the second embodiment at various stages during the cutting process. Fig. 8 (a) shows the device 1 in the open position with an already inserted plastic corrugated pipe 6. The plastic corrugated pipe 6 was inserted into the open pipe receiving space 8 such that the cutting blade 30 of the second cutting ring portion 20b already pierced through the wall of the plastic corrugated pipe 6 is. Fig. 8 (b) shows the state after the device 1 has been closed and is in the closed position. When closing the cutting blade 30 of the first cutting ring portion 20a pierces the wall of the plastic corrugated pipe 6, and the locking clips 16 lock the device 1 and the housing parts 2a, 2b in the closed position. In Fig. 8 (c), the driving pinion 44 was driven counterclockwise, thereby shifting the cutting ring 20 and the cutting blades 30 thereof clockwise. In Fig. 8 (d), the drive pinion 44 has been further driven counterclockwise, whereby the cutting ring 20 and the cutting blades 30 has been displaced clockwise by about 180 ° from the initial position, whereby a complete cut is produced by the plastic corrugated pipe 6. Unlike the manual variant according to the first embodiment, the cutting ring 20 is after the complete cut back to the normal position, and the device can therefore be opened directly after cutting to remove the plastic corrugated pipe 6.

Fig. 9 shows a sectional view of a device 1 according to a third embodiment in a closed position, and Fig. 10 shows a sectional view of the same device 1 in the open position. In the device 1 of the third embodiment is a manually operated variant similar to the first embodiment. A difference from the first embodiment is that both the first housing part 2a and the second housing part 2b each have a fixing hook 48, which are arranged in the region of the hinge joint of the housing parts 2a, 2b. The fixing hooks 48 are designed, in the open position of the housing parts 2a, 2b, respectively to engage in a fixing pocket 50 of the first and the second drive toothed rim section 22a, 22b in order to fix them in the basic position. Fig. 11 shows a detail view thereof. Thus, a displacement of the drive sprocket portions 22a, 22b is prevented in the drive sprocket guides in the open position. At the same time, a displacement of the cutting ring sections 20a, 20b in the cutting ring guides in the open position is prevented since these are coupled via the intermediate pinions 28 to the drive sprocket sections 22a, 22b. In the closed position of the device 1 or the housing parts 2a, 2b, the fixing hooks 48 are displaced out of the fixing pockets 50, so that the drive toothed rim sections 22a, 22b, the intermediate pinions 28 and the cutting ring sections 20a, 20b can be displaced.

FIG. 12 shows a detailed view of the second housing part 2b in the region of the hinge joints 4 or the rotary shafts thereof. The other components of the device are hidden in FIG. 12. The fixing hook 48 is arranged radially outwardly between the rotary shafts of the hinge joints 4 on the second housing part 2b, in particular on the left second housing part section. The fixing hook 48 of the first housing part (not shown) is arranged in the connected state of the two housing parts side by side so that both fixing hooks 48 can engage in the respective fixing pockets of the first and second drive sprocket portion 22a, 22b. In other words, the fixing hooks 48 of the housing parts are arranged at the same axial height as the drive sprocket guide 26 and the cutting ring 24.

Fig. 13 shows an embodiment of a cutting blade holder 32 as provided in the third embodiment of the apparatus. However, this cutting blade holder 32 is also usable in the apparatus of the first or second embodiment when the configuration of the cutting ring portions is adjusted accordingly. Fig. 14 shows a A sectional view of the cutting blade holder 32 of FIG. 13, wherein the cutting blade holder 32 is mounted in a cutting ring portion. Similar to the cutting blade holders of the first and second embodiments, in this cutting blade holder 32, the cutting blade 30 is fixed in a head portion of the cutting blade holder 32 so that the tip of the cutting blade 30 projects radially inward. The cutting blade guard 34 hides the cutting blade 30 in the radial direction. The difference between the embodiment shown in Figs. 13 and 14 is that the cutting blade holder 32 is easily manually replaceable. For this purpose, the cutting blade holder 32 on two mounting arms 52, which are elastically displaceable to each other substantially in the radial direction. At the end portions of the mounting arms 52 each locking projections 54 are formed, which can lock into corresponding locking recesses of the Schneideringabschnitte. To disassemble the cutting blade holder 52, a mounting arm 52 can be elastically displaced radially inward with the fingers to release the latch. For this purpose, the cutting blade holder 32 may be formed asymmetrically and have a shorter and a longer mounting arm 52. The mounting arms protrude in the assembled state at both end edges of the cutting ring portion, so that the projecting portion can be grasped by the fingers of the user. Due to the position of the cut, one of the two protruding parts of the respective mounting arms 52 can not be seen in the sectional illustration in FIG. 14. In the plan view in Fig. 15, however, both protruding parts of the respective mounting arms 52 can be seen. For even better accessibility of the user's fingers, recesses 56 may be provided on the end edges of the cutting ring portions. Despite the asymmetric design of the cutting blade holder 32, two of these cutting blade holder 32 of the respective cutting ring sections complement each other to form a circumferential ring, which also contributes to the positioning and fixing of the plastic pipe. Fig. 16 shows an embodiment of an insert 36, which can be easily assembled and disassembled manually. For this purpose, the insert part 36 has a radially outwardly projecting, elastically displaceable latching section 58, which can be locked with a Verrastungskante of the housing part. Thus, the insert 36 can be easily clipped with the housing part. To release the latching or Verklipsung two gripping projections 60 of the latching portion 58, which protrude from the housing part in the assembled state, gripped with the fingers and elastically displaced to each other.

LIST OF REFERENCE NUMBERS

1 device

2 housings

2a first housing part

2b second housing part

4 hinge joint

6 plastic corrugated pipe

8 tube receiving space

10 base

11 screw

12 slot

14 operating lever

16 locking clip

18 locking edge

20 cutting ring

20a first cutting ring section

20b second cutting ring section

22 drive sprocket

22a first drive sprocket section

22b second drive sprocket section

24 cutting ring

26 Drive sprocket guide

28 intermediate pinions cutting blade

Cutting blade holder Cutting blade protection Insert

mounting rib

mounting slot

Positioning rib Drive pinion

engine

Locking hook Fixation pocket Mounting arm

Locking projection recess

Locking section gripping projection

Claims

claims

1. Device (1) for cutting plastic pipes (6), in particular plastic corrugated pipes (6), comprising:

a multi-part housing (2), comprising a first housing part (2a) and a second housing part (2b) which are displaceable relative to each other between an open position and a closed position, wherein the housing parts (2a, 2b) in the closed position a tube receiving space ( 8) for at least partially receiving the plastic tube (6) form;

a multi-part cutter ring (20) comprising a first cutter ring portion (20a) and a second cutter ring portion (20b), which are formed separately from each other and displaceable relative to the housing parts (2a, 2b), wherein the cutter ring portions (20a, 20b) in the Closed position of the housing parts (2a, 2b) are arranged to extend around the tube receiving space (8) and wherein at least one of the Schneideringabschnitte (20a, 20b) at least partially in the tube-receiving space (8) radially inwardly projecting cutting blade (30) having; and

drive means (22, 28, 44, 46) for rotationally driving the cutting ring (20);

wherein in the closed position of the housing parts (2a, 2b), the plastic tube (6) in the tube-receiving space (8) is fixable, and in the open position of the housing parts (2a, 2b) the plastic tube (6) substantially in the radial direction in the open tube receiving space (8) is insertable.

2. Device (1) according to claim 1, wherein the housing parts (2 a, 2 b) are articulated to each other, so that the housing parts (2 a, 2 b) transversely to an axial direction of the housing (2) between the open position and the closed position are pivotally displaceable ,

3. Device (1) according to claim 1 or 2,

wherein the cutting ring (20) is at least partially formed as an annular gear ring; and

wherein the first and / or the second cutting ring portion (20a, 20b) are at least partially formed as first and / or second cutting gear rim portions.

4. Device (1) according to claim 3, wherein the drive device (22, 28) comprises:

a multi-piece drive sprocket (22) comprising a first drive sprocket portion (22a) and a second drive sprocket portion (22b) formed separately from each other and displaceable relative to the housing parts (2a, 2b), the drive sprocket portions (22a, 22b) being disposed in the Closed position of the housing parts (2a, 2b) are arranged substantially around the cutting ring (20) extending around; and

an intermediate pinion (28) interposed between the cutting ring (20) and the drive sprocket (22) and engaged with both teeth of the cutting ring (20) and teeth of the drive sprocket (22);

wherein the drive sprocket (22) has an actuating element (14) with which the drive sprocket (22) is manually rotatably displaceable in order to rotationally displace the cutting ring (20) via the intermediate sprocket (28).

5. Device (1) according to claim 4, wherein the numbers of teeth of the cutting ring (20), the drive sprocket (22) and the intermediate pinion (28) are set such that upon a rotational displacement of the drive sprocket (22) a rotation amount of the cutting ring (20 ) is increased relative to a rotational amount of the drive sprocket (22).

6. Device (1) according to claim 3, wherein the drive device (44, comprising:

a drive pinion (44); and a motor (46);

wherein the drive pinion (44) is engaged with the teeth of the cutter ring (20); and

wherein the drive pinion (44) is drivable by means of the motor (46) to rotationally displace the cutting ring (20).

7. Device (1) according to one of the preceding claims,

wherein at least one of the housing parts (2a, 2b) has a positioning rib (42) for axially positioning the plastic corrugated pipe (6) in the pipe receiving space (8).

8. Device (1) according to claim 7,

wherein the positioning rib (42) is adapted to position the plastic corrugated tube (6) in the tube receiving space (8) so that a section of the cutting blade (30) extends exclusively along a wave crest of the plastic corrugated tube (6).

9. Device (1) according to one of the preceding claims,

wherein the housing (2a, 2b) has replaceable inserts (36) for modifying the tube-receiving space (8).

10. Device (1) according to one of the preceding claims,

wherein the first cutting ring portion (20a) and the second cutting ring portion (20b) each have a cutting blade (30) projecting radially inwardly at least partially into the tube receiving space (8), the cutting blades (30) substantially on two opposite sides of the cutting ring (20) are arranged.

11. Device (1) according to one of the preceding claims,

the cutting blade (30) having a cutting blade guard (34);

wherein the cutting blade guard (34) is formed like a leaf spring and in the open position of the housing parts (2a, 2b), the cutting blade (30) concealing is arranged;

wherein during displacement of the housing parts (2a, 2b) from the open position to the closed position in the presence of the plastic tube (6) in the tube receiving space (8) of the cutting blade guard (34) by an outer surface of the plastic tube (6) against an inner wall of the tube Receiving space (8) is pressed, wherein the cutting blade (30) through a slot in the cutting blade guard (34) emerges.

12. A method for cutting plastic pipes (6), in particular plastic corrugated pipes (6), comprising the steps:

Inserting the plastic tube (6) substantially in the radial direction into an open tube receiving space (8) of a multi-part housing (2) in an open position;

Relocating a first housing part (2a) and a second housing part (2b) of the housing (2) relative to each other from the open position to a closed position, wherein in the closed position, the plastic tube (6) in the tube on receiving space (8) is fixed, separated arranged one another and arranged relative to the housing parts (2a, 2b) displaceably arranged first and second cutting ring portions (20a, 20b) of a multi-part cutter ring (20) around the tube receiving space (8) around, and at least one cutting blade (30) of a the cutting-ring portions (20a, 20b) pierces through a wall of the plastic pipe (6) and projects at least partially radially inward into the pipe-receiving space (8); and

rotational driving of the cutting ring (20) by means of drive means (22, 28, 44, 46) for forming a circumferential cut in the wall of the plastic pipe (6).