EP3710176B1 - Manually operated drum-type pipe cleaning device - Google Patents

Description

The invention relates to a hand-held drum pipe cleaning device according to the preamble of claim 1.

Such pipe cleaning devices are used to clean pipelines for sewage or rainwater, for example to remove blockages or other blockages that have arisen in the flow path. For this purpose, the pipe cleaning devices have a spring shaft which is inserted into the pipeline and set in rotation. As a result of the rotation, the spring shaft meanders through the pipeline.

A replaceable cleaning tool is usually mounted at the front end of the spring shaft, the output end. At the rear end, the spring shaft is mounted in a rotatably driven drum and is displaceable therefrom, for example by a feed device acting on the spring shaft, and can also be retracted back into the drum. The rotary movement of the spring shaft is caused by the rotary movement of the drum.

The pipeline devices are constructed in such a way that they can be held in their hands by a user during operation. A handle is usually provided for this purpose. For example, the handle is designed such that the drum is rotatably supported. The user can often operate the feed device via the handle.

A drum pipe cleaning device of the generic type is from the US 2014/223679 A1 known. Furthermore, from the U.S. 4,218,802 A a drum pipe cleaning device known.

One object of the invention is to further develop a hand-held drum-pipe cleaning device of the type mentioned at the beginning with regard to handling and user-friendliness.

This object is achieved with a hand-held drum pipe cleaning device which comprises the features of claim 1. Furthermore, a hand-held drum pipe cleaning machine with the features of claim 11 is proposed to achieve the object. Advantageous embodiments of the invention emerge from the subclaims, furthermore advantageous configurations and / or aspects from the following description and the figures.

A hand-held drum pipe cleaning device according to the invention comprises a drum rotatable about an axis of rotation and a spring shaft assigned to the drum, a length portion of the spring shaft extending from the drum, in particular extending away, and the length portion being rotatable about its longitudinal axis through or via a rotation of the drum or is rotated. For example, the spring shaft is held, in particular at least partially, in or within or on the drum.

The hand-held drum pipe cleaning device, hereinafter also referred to as pipe cleaning device for short, further comprises a handle which is designed to support the drum in a rotatable manner. This is to be understood in particular that through the handle of the drum is or can be rotatably held. Furthermore, the pipe cleaning device can comprise an advancing device in order to bring the spring shaft into an advancing movement or a retracting movement.

The drain cleaning device has a drive shaft for driving the drum and a connection point assigned to the drive shaft in order to drively connect the drive shaft to a drive machine, in particular an output shaft of the drive machine. Due to the connection point, the drive machine for driving the drum does not need to be an integral part of the drain cleaning device. Rather, a suitable drive machine can be drive-coupled to it if necessary. For example, it is thus made possible that conventional cordless screwdrivers, drills or other power tools or electric tools can be used as the drive machine to drive the drum. This results in a cost advantage in the proposed pipe cleaning device, since a drive machine that is already available for other applications can be used as the drive machine for driving the drum. The connection point can be formed by a length section of the drive shaft which, for example, is polygonal, in particular hexagonal, in cross section.

The drain cleaning device also has an overrunning clutch, via which the drive shaft is operatively connected or operatively connectable to the drum such that the overrunning clutch couples when the drive shaft is driving and the overrunning clutch freewheels when the drum is driving, i.e. the overrunning clutch is one when the drive shaft is driving Coupling function and exercising a freewheel function when the drum is driving. The one-way clutch is to be understood as meaning, in particular, a mechanical one-way clutch. In particular, the overrunning clutch is a mechanical device which is used for power transmission and which includes the freewheeling function described above. In particular, the overrunning clutch is to be understood as a switchable clutch which, depending on the rotational movement and / or the torque of the drive shaft relative to the drum, switches automatically, for example the overrunning clutch performing the freewheeling function in one switching state and the clutching function in another switching state. The coupling function is to be understood in particular as the fact that the drive shaft and the drum are connected to one another in terms of drive. The freewheel function is to be understood in particular as the fact that the drive shaft and the drum are decoupled from one another in terms of drive.

The overrunning clutch takes a measure to avoid torques acting on an operator of the drive machine or to counteract such torques when the drive power of the drive machine is throttled, for example in the course of a shutdown process. In this operating state, the inertia of the drum and, above all, the inertia of the spring shaft become noticeable, which act as an energy store for at least part of the kinetic energy generated by the drive machine.

When throttling the speed of the drive machine, it happens that when the speed of the drive machine falls below a certain speed, the drum tries to reach the drive shaft and thus driving the output shaft of the prime mover. In order to prevent the drive machine from rotating at the same time, the operator must hold the drive machine accordingly. However, this can mean a relatively great effort for the operator, for example if the drive machine is switched off abruptly and the stored kinetic energy builds up on the drive machine like a pulse. This state is counteracted by the overrunning clutch, since the overrunning clutch exerts its freewheeling function when the drum is driving, that is to say no power transmission takes place between the drive shaft and the drum. This already results in advantages in the handling of the drain cleaning device. Operation is also made easier as a result.

According to a preferred embodiment of the pipe cleaning device, it is provided that the overrunning clutch is in a geometrical arrangement radially between the drive shaft and an intermediate shaft connected to the drum in a rotationally fixed manner or formed on the drum and for this purpose at least one of these two shafts is designed as a hollow shaft, in which the other shaft and the overrunning clutch are added. This promotes a technically simple structure of the pipeline device, taking the overrunning clutch into account. For example, the hollow shaft is arranged concentrically with the one-way clutch and the hollow shaft and the one-way clutch are both in turn arranged concentrically with the other shaft.

According to a further preferred embodiment of the pipe cleaning device, it is provided that the One-way clutch sits on the drive shaft and is overlapped by the intermediate shaft, the intermediate shaft being pushed onto the drive shaft and being arranged in the axial direction between two stops, by which the intermediate shaft is secured against axial detachment from the drive shaft. For example, it is provided that at least one of the stops is connected to the drive shaft in a non-shiftable manner, that is to say is firmly connected in the axial direction. Both stops can also be connected to the drive shaft in a non-shiftable manner. It can also be the case that at least one of the stops is molded onto the drive shaft.

Alternatively, it can be provided that the overrunning clutch sits on the intermediate shaft and is overlapped by the drive shaft, the drive shaft being pushed onto the intermediate shaft and arranged in the axial direction between two stops, by means of which the drive shaft is secured against axial loosening from the intermediate shaft is. For example, it is provided that at least one of the stops is connected to the intermediate shaft in a non-shiftable manner, that is to say is fixedly connected in the axial direction. Both stops can also be connected to the intermediate shaft in a non-shiftable manner. It can also be the case that at least one of the stops is integrally formed on the intermediate shaft.

It is advisable that one of the stops is permanently connected to the drive shaft or is molded onto the drive shaft. The non-detachable connection between the one stop and the drive shaft is to be understood in particular as meaning that the stop only passes through the drive shaft Destroying at least one of the components can be solved. For example, a permanent connection is implemented by welding or some other thermal joint. It is also advisable for the other stop to be detachably arranged on the drive shaft, in particular to be formed or encompassed by a securing element detachably fastened to the drive shaft. Alternatively, it can also be provided that one of the stops is permanently connected to the intermediate shaft or is molded onto the intermediate shaft and the other stop is detachably arranged on the intermediate shaft, in particular formed or encompassed by a securing element detachably attached to the intermediate shaft.

In particular, it is provided that the securing element is arranged or is located in the area of an interior space of the drum. As a result, the detachable stop is housed protected from the outside. Unintentional loosening of the stop from the drive shaft, for example due to external influences or third parties, is made more difficult by this protected arrangement. For example, the one stop is molded onto the drive shaft in that the one stop is formed by a shaft collar, shaft shoulder or similar formation or has such a formation.

The interior of the drum can be realized in that the drum comprises a front side and a rear side, for example the rear side being releasably connected to the front side in order to provide access to the spring shaft which is at least partially wound in the drum. The interior of the drum can be called the Gap between the front and the back are understood, in which the spring shaft is wound.

Another preferred embodiment of the pipe cleaning device consists in that the drive shaft, the intermediate shaft and the overrunning clutch form a common structural unit which is detachably fastened or mounted on the drum. This measure aims to facilitate the installation of the overrunning clutch. The structural unit makes it easier, for example, to carry out a pre-assembly and thus to realize the structural unit as a pre-assembled structural unit, for example to enable quick and easy replacement when the pipe cleaning device is designed without an overrunning clutch.

For example, it is provided that the intermediate shaft is non-rotatably connected to a rear wall of the drum, in particular via a flange, and the intermediate shaft, in particular the flange, can be detached from the rear wall and / or the rear wall from the drum. As a result, the rear wall and the intermediate shaft or the flange can be made from different materials. For example, the rear wall is a plastic part and the flange and / or the intermediate shaft is a metal part. In principle, the drum and / or the rear wall of the drum can consist of plastic or comprise plastic material. In principle, the intermediate shaft and / or the drive shaft can also be a metal part.

Alternatively or in addition, it can be provided that the drive shaft, the intermediate shaft, the overrunning clutch and one or the rear wall of the drum form a common structural unit form, wherein the intermediate shaft and the rear wall are non-rotatably and non-detachably connected to each other or are formed against each other and the rear wall is detachably connected to the drum, in particular the rear wall is detachably mounted or attached to the drum. As a result, the rear wall of the drum also forms an integral part of the structural unit. This measure is also aimed at facilitating the installation of the overrunning clutch. The structural unit can be preassembled in order, for example, to allow a quick and easy replacement in a design of the pipe cleaning device without an overrunning clutch.

In a further preferred embodiment of the pipe cleaning device, it is provided that the drive shaft and the intermediate shaft are mounted against each other in the radial direction and at least one, preferably two bearings are provided, which are spaced apart in the axial direction and the overrunning clutch is arranged between them. This measure aims to bring the drive shaft and the intermediate shaft to each other in the most stable and durable arrangement possible, without impairing the freewheeling function of the freewheel clutch, that is, the freewheeling of the intermediate shaft relative to the drive shaft. The at least one bearing or at least one of the bearings can be a plain bearing. In principle, the use of a roller bearing is also possible.

For example, the at least one bearing or at least one of the bearings performs a function as an axial bearing, for example in order to realize an axial bearing against the associated stop. In this case, the end face of the intermediate shaft can against the stop of the drive shaft and / or the end face of the intermediate shaft can be arranged against the securing element or, if appropriate, against a washer element or securing washer connected upstream of the securing element.

The overrunning clutch can be or comprise a roller freewheel and / or a clamping body freewheel and / or a pawl freewheel and / or a claw ring freewheel. The overrunning clutch can also be or comprise a wrap spring clutch and / or a self-synchronizing clutch. It is decisive that the overrunning clutch exercises the freewheeling function described above in the manner described above.

In a further aspect, a hand-held drum drain cleaning machine is provided. The pipe cleaning machine comprises the pipe cleaning device described above or at least one configuration or embodiment of the pipe cleaning device as well as a drive machine which is drivingly coupled to the drive shaft of the pipe cleaning device.

Further details and features of the invention emerge from the following description of an exemplary embodiment with reference to the drawings.

Fig. 1

eine mögliche Ausführungsform eines handgeführten Trommel-Rohrreinigungsgerätes in einer Schnittdarstellung,

Fig. 2

einen vergrößerten Ausschnitt aus der Figur 1 im Bereich einer Freilaufkupplung des Rohrreinigungsgerätes und

Fig. 3

das Rohrreinigungsgerät gemäß der Figur 1 im Bereich seiner Freilaufkupplung in einer perspektivischen Ansicht als Teilschnitt.

Show it:

Fig. 1

a possible embodiment of a hand-held drum pipe cleaning device in a sectional view,

Fig. 2

an enlarged section of the Figure 1 in the area of an overrunning clutch of the drain cleaning device and

Fig. 3

the sewer cleaning device according to the Figure 1 in the area of its overrunning clutch in a perspective view as a partial section.

Figure 1 shows - in a schematic representation - a possible embodiment of a hand-held drum-pipe cleaning device 1, which is hereinafter referred to as pipe-cleaning device 1 for short. The pipe cleaning device 1 is used, for example, to clean pipelines and / or channels for waste water or rainwater, for example to remove blockages or other blockages that have arisen in the flow.

The pipe cleaning device 1 comprises a drum 3 which can be rotated about an axis of rotation 2. The pipe cleaning device 1 furthermore comprises a spring shaft 4 held at least partially inside or on the drum 3, a length section 5 of the spring shaft 4 extending away from the drum 3 and through or over a Rotation of the drum 3, the length section 5 is rotated or can be rotated about its longitudinal axis. For example, the longitudinal axis of the longitudinal section 5 of the spring shaft 4 and the axis of rotation 2 of the drum 3 lie on a common axis or are arranged at a distance from one another, in particular arranged at a parallel distance.

In addition, the pipe cleaning device 1 comprises a handle 7 and, for example, a feed device 8. The handle 7 is designed to hold the drum 3 to support or hold rotatably. The feed device 8 serves to bring the spring shaft 4 into an advance movement or a retraction movement. For example, the handle 7 is designed as a tubular element. For example, the handle 7 is constructed in at least two parts. For example, the handle 7 comprises at least two handle parts 35 and 36, preferably non-rotatably connected to one another. The handle parts 35, 36 can each be tubular. For example, the handle parts 35, 36 are plugged into one another and one of the handle parts 35, 36, in particular the handle part 36, forms an outer sleeve which, for example, has a gripping surface that can be gripped. The handle 7 can encompass an inner tube 34 that is connected to the drum 3 in a rotationally fixed manner and, in particular, can be rotatably mounted against it. The inner tube 34 forms, for example, a connecting element for the spring shaft 4 from the drum 3 to the feed device 8, the length section 5 of the spring shaft 4 preferably being received in the inner tube 34. The feed device 8 is preferably connected to the handle 7 in a rotationally fixed manner.

Furthermore, the pipe cleaning device 1 comprises a drive shaft 9 for driving the drum 3. For this purpose, the drive shaft 9 can be or is operatively connected to the drum 3. The axis of rotation 2 of the drum 3 and the shaft axis 23 of the drive shaft 9 are preferably arranged coaxially to one another. The drive shaft 9 is assigned a connection point 10 in order to connect the drive shaft 9 with a (in the Figure 1 not shown) drive machine to connect drivingly. The pipe cleaning device 1 is preferably constructed geometrically in such a way that, starting from the connection point 10, the following components are present one behind the other in the following order: the drive shaft 9, the Drum 3, the handle 7, the feed device 8. From the feed device 8 protrudes at the end of a portion of the spring shaft 4, which in the Figure 1 is incomplete. There is a (in the Figure 1 Cleaning tool (not shown) arranged on the head side, which forms the output end of the spring shaft 4 and can be implemented as an exchange element.

The connection point 10 can be a length section of the drive shaft 9 which is angular, in particular polygonal, such as hexagonal, in cross section. In principle, the length section of the drive shaft 9 used as the connection point can also be round, in particular circular or oval. In particular, the connection point 10 is designed to be able to couple a power tool, such as a cordless screwdriver, a drill or another drive machine, which is preferably an electrically driven drive machine and can be held in the hand during operation. For example, the length section is designed as a hexagon in order to be able to drive a drill chuck of a drive machine, such as a cordless screwdriver or an electric drill, to it.

In order to avoid a possible, for example impulsive, torque acting on the operator of the drive machine when the speed of the drive machine is reduced or when the drive machine is switched off, which may have an effect due to the inertia of the drum 3, for example, the drain cleaning device 1 has an overrunning clutch 11. The drive shaft 9 can be operatively connected to the drum 3 in this way or via the overrunning clutch 11 Operationally connected, that when the drive shaft 9 is driving, the overrunning clutch 11 couples, i.e. a drive torque is transmitted, and when the drum 3 is driving, the overrunning clutch 11 frees, so then a power transmission between the drive shaft 9 and the drum 3 does not take place. In addition, the overrunning clutch 11 can exercise a function such that it only has a coupling effect in one direction of rotation of the drum 3 and freewheels in the other direction of rotation of the drum 3.

Figure 2 shows the pipe cleaning device 1 of Figure 1 in an area of the overrunning clutch 11 as an enlarged illustration. Figure 3 shows the pipe cleaning device 1 in the area of the overrunning clutch 11 in a perspective view of a rear side 18 of the drum 3 as a partial section. As can be seen in particular from this, the overrunning clutch 11 is provided in a geometrical arrangement radially between the drive shaft 9 and an intermediate shaft 12 connected to the drum 3 in a rotationally fixed manner. For this purpose, the intermediate shaft 12 is preferably designed as a hollow shaft in which the drive shaft 9 and the overrunning clutch 11 are received. For example, the intermediate shaft 12 is arranged concentrically to the overrunning clutch 11 and the intermediate shaft 12 and the overrunning clutch 11 in turn are arranged concentrically to the drive shaft 9.

The overrunning clutch 11 is preferably seated on the drive shaft 9 and is overlapped by the intermediate shaft 12, the intermediate shaft 12 being pushed onto the drive shaft 9. In order to secure the intermediate shaft 12 against loosening relative to the drive shaft 9 in the axial direction, two stops 13, 14 can be provided. between which the intermediate shaft 12 is arranged. For example, one of the stops 13, 14, in particular the stop 13, is integrally formed on the drive shaft 9. For example, the stop 13 is formed by a shaft collar or shaft shoulder of the drive shaft 9. For example, the other of the stops 13, 14, in particular the stop 14, is formed by a securing element 15 that is releasably fastened to the drive shaft 9. The securing element 15 can be a securing ring which engages around the drive shaft 9, in particular engages in a notch on the outer circumference of the drive shaft 9.

Furthermore, between the axial end of the intermediate shaft 12, which faces the securing element 15, and the securing element 15, an intermediate element 26, such as a disk-shaped intermediate element, such as a washer or a washer, can be pushed onto the drive shaft 9. The drive shaft 9 with its mounted securing element 15 is preferably coupled to the drum 3 in such a way that the securing element 15 is located in the area of an interior 16 of the drum 3 or is at least accessible via the interior 16 of the drum 3. In this case, the other stop 13 is then preferably arranged facing the connection point 10.

The overrunning clutch 11 can be a roller freewheel, such as a sleeve freewheel with steel springs. The overrunning clutch 11 can also be a sprag freewheel or a pawl freewheel or a claw ring freewheel. The overrunning clutch 11 preferably has an inner part 24 and an outer ring 25 which surrounds the inner part 24 and which is preferably arranged coaxially to the inner part 24. The outer ring 25 is preferably connected to the intermediate shaft 12 in a rotationally fixed manner. In particular, the outer ring 25 is pushed with its outer circumference into the intermediate shaft 12, in particular pressed into a press fit.

The inner part 24 is preferably connected to the drive shaft 9 in a rotationally fixed manner. For example, the inner part 24 is designed as a ring and pushed onto the drive shaft 9, in particular pressed with a press fit. The drive shaft 9 can also form the inner part 24. The inner part 24 is then formed by the drive shaft 9. In this case, the drive shaft 9 is an integral part of the overrunning clutch 11.

The inner part 24 and the outer ring 25 are in the Figure 2 indicated schematically. A clutch mechanism of the overrunning clutch 11 is preferably arranged or formed between the inner part 24 and the outer ring 25, wherein the inner part 24 and the outer ring 25 can also be part of the clutch mechanism. This clutch mechanism is set up so that when the drive shaft 9 is driving, the overrunning clutch 11 is coupled and when the drum 3 is driving, the overrunning clutch 11 is overrunning. The inner part 24 and the outer ring 25 are therefore connected to one another in a rotationally fixed manner when the overrunning clutch 11 is coupled, that is to say when a clutch function is exercised. In contrast, the inner part 24 and the outer ring 25 can be rotated relative to one another when the one-way clutch 11 is freewheeling, that is, it is exercising its freewheeling function.

Preferably, the overrunning clutch 11 is also set up so that it only operates in a single direction of rotation Drive shaft 9 couples and freewheels in the other direction of rotation of drive shaft 9. For this purpose, the coupling mechanism uses clamping rollers or other clamping bodies, pawls, claw rings or a loop spring, depending on which type of freewheel is used for the overrunning clutch 11. The coupling mechanism preferably also uses spring elements in order, for example, to press provided clamping rollers between the inner part 24 and the outer ring 25 into a force-transmitting position.

In order to facilitate the assembly of the pipe cleaning device 1, it is preferably provided that the drive shaft 9, the intermediate shaft 12 and the overrunning clutch 11 form a common structural unit which is detachably fastened to the drum 3. For example, the intermediate shaft 12 is connected to the drum 3 in a rotationally fixed and detachable manner via a flange 20. For example, the flange 20 is attached to a rear wall 19 of the drum 3. It may be that the flange 20 can be detached from the rear wall 19 and / or the rear wall 19 from the drum 3. For example, the flange 20 is connected to the rear wall 19 by means of at least one screw-nut connection, wherein at least one screw element 27 and thus a screwed nut element 28 can be used. For example, the rear wall 19 is also fastened to the drum 3 by means of a plurality of screw elements 29.

The drum 3 preferably comprises a front side 17 and a rear side 18 which is detachably connected to the front side 17 in order to provide access to the spring shaft 4 which is at least partially wound in the drum 3. The rear side 18 is, for example, through the rear wall 19 formed or comprises the rear wall 19, to which the drive shaft 9 is coupled with the interposition of the overrunning clutch 11. For example, the front side 17 comprises a housing that spans the interior space 16 and in which the spring shaft 4 is housed. The housing preferably has a substantially funnel-shaped or a cone-shaped section 30 which tapers in the direction of the handle 7 and thus widens in the direction of the rear wall 19. A substantially cylindrical section 31 of the housing preferably adjoins this towards the rear wall 19.

The rear wall 19 can be designed in the manner of a funnel, this funnel-shaped configuration tapering in the direction of the handle 7 so that the rear wall 19 is recessed in the center, that is to say in the area of the drive shaft 9. This recess is preferably designed in such a way that the intermediate shaft 13 is countersunk in the recess and only the drive shaft 9 with its connection point 10 protrudes therefrom. The intermediate shaft 12 preferably extends through a through opening in the rear wall 19 with one end, the border of the through opening being able to be supported on the intermediate shaft 12.

The intermediate shaft 12 is preferably mounted rotatably in the radial direction relative to the drive shaft 9. In addition, the intermediate shaft 12 can also be mounted rotatably in the axial direction with respect to the drive shaft 9. For this purpose, at least one, preferably two, bearings 21, 22 are preferably provided, which are spaced apart from one another in the axial direction and the overrunning clutch 11 is arranged between them. At least one of the bearings 21, 22 is preferred, or both bearings 21, 22 designed as a plain bearing. For example, the plain bearing is implemented by a bushing or the like, with a bearing acting in the axial direction between the end face of the intermediate shaft 12 and the associated stop 13 or 14 of the drive shaft 9 being implemented by a radially outward and preferably circumferential radial collar of the bushing can. In principle, it is also possible for at least one of the bearings 21, 22 or both bearings 21, 22 to be saved and for the overrunning clutch 11 to provide a bearing in the radial direction and / or in the axial direction in a corresponding manner.

The drive shaft 9 can have a shoulder 32, such as a shaft collar or the like, which is provided for structural reasons, for example in order to be able to install the bearing 21 with a larger inner diameter than the bearing 22. For example, the drive shaft 9 then has a larger diameter in the area of the bearing 21 than in the area of the bearing 22 and possibly in the area of the overrunning clutch 11 so that, for example, it can be pushed on from one end of the drive shaft 9. Furthermore, a shoulder 33, such as a shaft collar or the like, can be formed on the intermediate shaft 12, which can serve, for example, as a positioning aid when installing, in particular pressing in, the overrunning clutch 11.

As a result of the overrunning clutch 11, the drain cleaning device 1 has, for example, the following mode of operation: A drive machine coupled to the connection point 10 as a drive is started and the drum 3 is thereby set in rotation. In this operating state, the Freewheel clutch 11. When the drive machine is switched off, the freewheel function of the freewheel clutch 11 is used and the drum 3 can coast freely in its rotational movement, even if the output shaft of the drive machine is already at a standstill.

The use of some or all of the examples or exemplary language in the text is only intended to illuminate the invention and does not constitute a restriction on the scope of the invention, unless otherwise stated. The scope of the invention is defined by the claims.

List of reference symbols

1

hand-held drum pipe cleaning device, pipe cleaning device

2

Axis of rotation

3

drum

4th

Spring shaft

5

Length section

6th

Longitudinal axis

7th

Handle

8th

Feed device

9

drive shaft

10

Connection point

11th

One-way clutch

12th

Intermediate shaft

13th

attack

14th

attack

15th

Fuse element

16

inner space

17th

front

18th

back

19th

Back wall

20th

flange

21

warehouse

22nd

warehouse

23

Shaft axis

24

inner part

25th

Outer ring

26th

Intermediate element

27

Screw element

28

Mother element

29

Screw element

30th

conical section

31

cylindrical section

32

paragraph

33

paragraph

34

Inner tube

35

Handle part

36

Handle part

Claims (11)

1. Hand-guided drum-type pipe-cleaning device (1), comprising

   a drum (3), which is rotatable about an axis of rotation (2), and a spring shaft (4), which is assigned to the drum (3), wherein a length section (5) of the spring shaft (4) extends from the drum (3), and the length section (5) is rotatable about its longitudinal axis (6) by way of rotation of the drum (3),

   a handle (7), which is configured for rotatable support of the drum (3),

   a drive shaft (9), which serves for driving the drum (3), and an attachment point (10), assigned to the drive shaft (9), for connecting the drive shaft (9) to a drive machine in terms of drive,

   characterized in that the pipe-cleaning device (1) comprises a freewheel coupling (11) via which the drive shaft (9) is or can be connected operatively to the drum (3) in such a way that, with a driving drive shaft (9), coupling is performed by the freewheel coupling (11) and, with a driving drum (3), the freewheel coupling (11) runs freely.
2. Pipe-cleaning device according to Claim 1, characterized in that the freewheel coupling (11) is present in a geometrical arrangement radially between the drive shaft (9) and an intermediate shaft (12) which is connected rotationally conjointly to the drum (3) or which is formed integrally on the drum (3), and for this purpose at least one of these two shafts (9, 12) is in the form of a hollow shaft into which the other shaft (9) and the freewheel coupling (11) are received.
3. Pipe-cleaning device according to Claim 2, characterized in that the freewheel coupling (11) is seated on the drive shaft (9) and is engaged over by the intermediate shaft (12), wherein the intermediate shaft (12) is pushed onto the drive shaft (9) and, in the axial direction, is arranged between two stops (13, 14), by way of which stops the intermediate shaft (12) is secured against axial detachment from the drive shaft (9).
4. Pipe-cleaning device according to Claim 3, characterized in that one of the stops (13, 14) is connected non-detachably to the drive shaft (9) or is formed integrally on the drive shaft (9), and the other stop (14) is formed by a securing element (15) which is arranged detachably on the drive shaft (9) and which is situated in the region of an interior space (16) of the drum (3).
5. Pipe-cleaning device according to one of Claims 2 to 4, characterized in that the drive shaft (9), the intermediate shaft (12) and the freewheel coupling (11) form a common structural unit which is fastened detachably to the drum (3).
6. Pipe-cleaning device according to one of Claims 2 to 5, characterized in that the intermediate shaft (12) is connected rotationally conjointly to a rear wall (19) of the drum (3), and the intermediate shaft (12) can be detached from the rear wall (19) and/or the rear wall (19) can be detached from the drum (3).
7. Pipe-cleaning device according to one of Claims 2 to 4, characterized in that the drive shaft (9), the intermediate shaft (12), the freewheel coupling (11) and a rear wall (19) of the drum (3) form a common structural unit, wherein the intermediate shaft (12) and the rear wall (19) are connected rotationally conjointly and non-detachably to one another or are formed integrally against one another and the rear wall (19) is connected detachably to the drum (3).
8. Pipe-cleaning device according to one of Claims 2 to 7, characterized in that the drive shaft (9) and the intermediate shaft (12) are mounted against one another in the radial direction and, for this purpose, provision is made of at least one, preferably two, bearings (21, 22) which are spaced apart from one another in the axial direction and between which the freewheel coupling (11) is arranged.
9. Pipe-cleaning device according to Claim 8, characterized in that the at least one bearing (21, 22) or at least one of the bearings (21, 22) performs a function as an axial bearing.
10. Pipe-cleaning device according to one of the preceding claims, characterized in that the freewheel coupling (11) comprises a roller-type freewheel and/or a clamping body-type freewheel and/or a ratchet-type freewheel and/or a claw ring-type freewheel.
11. Hand-guided drum-type pipe-cleaning machine, comprising a pipe-cleaning device (1) according to one of the preceding claims and a drive machine which is coupled in terms of drive to the drive shaft (9) of the pipe-cleaning device (1).

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