EP1106130A1 - Telescopic vacuum cleaner pipe made of three sections - Google Patents

Abstract

The suction tube has an outer tube and an inner tube with latching recesses for engagement by a spring-loaded, manually released outer tube coupling latching element. A third tube encloses the outer tube telescopically; these tubes are releasably coupled in the extended state near their ends, where a seal closes the gap between them. The suction tube has an outer tube (3) and an inner tube (2) with latching recesses for engagement by a spring-loaded, manually released outer tube coupling latching element. A third tube (4) encloses the outer tube telescopically; these tubes are releasably coupled in the extended state near their ends, where a seal (3b,4b) closes the gap between them. The internal cross-section of the outer tube at the level of the seal and locking element is equal to or greater than the smallest cross-section of the suction tube. The length of the three tubes is between 420 and 570 mm. in the retracted state and between 890 and 1230 mm. in the fully deployed state.

Description

The invention relates to a telescopic vacuum cleaner suction pipe with an outer tube and an inner tube with locking recesses into which one that couples the outer tube and one that can be operated manually Slider or push button unlockable, under the action of a spring standing locking element engages.

It is a large number of different telescopic ones Vacuum cleaner suction pipes of the above type are known essentially by the type and design of the slide differentiate between the push button and the spring. Instead of many be on Subject of DE 195 28 814 C1 referenced. At this Embodiment is the locking element when the slide is not actuated held in its locked position by a spring under pressure and when the slide is actuated against the force of the spring to one Relative displacement of inner tube and outer tube in his Unlocked position moved. The locking element consists of two at an opposite acute angle to the longitudinal axis of the outer tube on an inclined sliding plane one in one Recess of the outer tube inserted in a form-fitting manner Guide body slidable, in separate locking recesses engaging clamp bodies, of which the relative movement from inside to outside tube locking clamps to solve this Locked position along the slide out of its recess its inclined sliding plane is displaceable. This principle has evolved in the Proven in practice and the expectations placed in it in full Fulfills.

Such two-part telescopic tubes have an insertion length between 530 mm and 600 mm on and with a full Extension length between approx. 880 mm and 1030 mm. A bigger one Extension length is often desirable in practice, but fails because of the then too large insertion length, which is not only the packaging and Transport costs increased, but also a correspondingly larger Warehousing costs.

A remedy could be e.g. three-part telescopic vacuum cleaner suction pipe create. However, this is linked to the problem that one hand the locking principle of locking between the first interior and the Outer tube can not be transferred to the third telescopic tube, because then the inner tube would no longer move in the outer tube. Another problem arises from the requirement that one three-part vacuum cleaner tube the flow losses are not may increase because otherwise the performance of the previous used motors prove inadequate or with a unwanted drop in suction power could be associated. Here sets now the invention.

This is based on the task of a telescopic To create a vacuum cleaner suction pipe of the type mentioned at the outset, which is avoided with at least the same extension length higher pressure losses due to a considerably shorter insertion length distinguished.

a) Das Außenrohr ist an seinem vom Innenrohr abgewandten Ende von einem dritten Rohr teleskopierend übergriffen,

b) das Außenrohr ist mit dem dritten Rohr in ausgezogener Lage in der Nähe der Endbereiche beider Rohre entweder durch ein kraftschlüssiges und/oder formschlüssiges Verriegelungselement lösbar gekuppelt,

c) der Ringspalt zwischen dem Außen- und dem dritten Rohr ist in ausgezogener Position an den Endbereichen beider Rohre von einer Dichtung abgedichtet,

d) der Innenquerschnitt des Außenrohres ist in Höhe der Dichtung und des kuppelnden Verriegelungselementes gleich oder größer als der kleinste Strömungsquerschnitt des Staubsauger-Saugrohres ausgebildet, und

e) das Innenrohr, das Außenrohr und das dritte Rohr weisen in vollständig zusammengeschobener Position eine Gesamtlänge zwischen 420 mm und 570 mm und in vollständig ausgezogener Stellung eine Länge zwischen 890 mm und 1230 mm auf.

This object is achieved in connection with the generic term mentioned at the outset by the following features:

a) the outer tube is telescopically overlapped at its end facing away from the inner tube,

b) the outer tube is detachably coupled to the third tube in the extended position near the end regions of both tubes either by a non-positive and / or positive locking element,

c) the annular gap between the outer and the third tube is sealed in the extended position at the end regions of both tubes by a seal,

d) the inner cross section of the outer tube is formed at the level of the seal and the coupling locking element equal to or larger than the smallest flow cross section of the vacuum cleaner suction tube, and

e) the inner tube, the outer tube and the third tube have a total length between 420 mm and 570 mm in the fully pushed-together position and a length between 890 mm and 1230 mm in the fully extended position.

All of these features are in direct inventive context. Characteristics a) and d) a cross-sectional narrowing compared to the previous two-part telescopic vacuum cleaner suction pipe prevented. Feature b) states that the outer tube with the third tube only in extended Position near the end areas by a non-positive and / or positive locking element is detachably coupled. So that will clarified that this locking element is only in the end region of the ends facing each other in the outer tube and third tube, so that the insertability of the inner tube into the outer tube is not can be hindered.

This also serves to avoid flow losses Feature c), so that the three-part, telescopic vacuum cleaner suction pipe the use of the previous electric motors and blowers without one ensures additional burden.

And finally, by the feature e) and the one mentioned there Insertion and extension lengths the compactness of the new telescopic vacuum cleaner suction tube evident.

By designing the locking element according to the Feature b) allows the invention to be completely different Embodiments.

According to a first embodiment, there is Locking element from one on the end area of the Outer peripheral surface of the third tube arranged lever catch, which with one end on the outer peripheral surface of the third tube supports and with its other latching end under the action of a spring Opening in the end area of the third tube penetrating into a Locking opening snaps into the outer tube and the seal from one Plastic ring is formed on the inner peripheral surface of the third Pipe rotatably arranged and with a passage opening for the Locking end of the lever catch is provided.

This embodiment has the advantage that the user the operation of such a telescopic vacuum cleaner suction pipe already knows such a lever catch, e.g. by coupling the free one End of the inner tube with the socket of a suction hose and therefore when handling the three-part telescopic Vacuum cleaner suction tube not in other ergonomic ideas has to rethink.

In a second embodiment, the locking element formed by a push button standing under the action of a spring is arranged on the inner peripheral surface of the outer tube and by an opening in the outer tube and another the outer tube on this Plastic sealing ring encircling the area into a Interlocking opening of the third tube engages. Also this push button principle is the user of the previously two-part telescopic Vacuum cleaner suction tube from the locking element between the inside and Outer tube ago known, so that this operation is not a rethink requires and also the three-part telescopic Vacuum cleaner suction pipe a uniform look without any noteworthy Gives sublimities on the outer peripheral surface.

In a third embodiment, there is Locking element from a locking button, which acts under the action of a Leaf spring or a conical spring stands with one end in a recess on the outer peripheral surface of the outer tube and with its other end a snap button through an opening in presses a sealing ring into a locking opening of the third tube. This embodiment has the advantage of one at its Outer peripheral surface of the third smooth pipe, which through Pressing the locking button can be unlocked from the outer tube. The leaf spring is a flat bow spring and the conical spring is like this trained that all spring turns in the interior of the previous turn find place, being in the pressed position on the block the total height of the conical spring is equal to or slightly greater than the thickness the largest turn. This makes it extremely compact reached and even at the point of depression on the Outer circumferential surface of the outer tube achieves a flow cross section, which according to the feature d) of the main claim is equal to or greater than the smallest flow cross section is, for example, in the inner tube.

According to a fourth embodiment, there is Locking element from a frustoconical end portion of the third tube and from one in the opposite direction frustoconical end of the outer tube, which in extended telescopic position with their facing each other Shell surfaces also form the seal. This purely frictional Coupling between the third tube and the outer tube is easy to manufacture technically and like the previously discussed embodiments the mandatory sealing ring can be dispensed with because this is at the same time non-positive coupled outer surfaces of the two truncated cones is formed. In addition, the third tube and the outer tube have a smooth Outside surface without a raised push button area and thus one appealing look.

This fourth embodiment can also be modified be that the third tube on its facing the outer tube End with a widened area and the Inner circumferential surface of the expanded area rotatably with a Sealing sleeve made of plastic is connected to their frustoconical inner circumferential surface with that in opposite Direction frustoconical outer peripheral surface of the Outer tube forms the locking element and the sealing element.

According to a fifth embodiment, the locking element from one arranged on the outer circumferential surface of the outer tube, formed with a slot expansion ring made of plastic, which with its outer peripheral surface at the corresponding end portion of the Inner circumferential surface of the third tube abuts and at a Relative rotation of both tubes to each other from a projection on the Outer peripheral surface of the outer tube, which is in a spiral Slot guide of the expansion ring engages in one direction spread apart and contracted in the other direction. With this known expansion ring seal is a simple manufacture and assembly and a relatively smooth outer surface of the outer tube and third tube achieved, but it is with flow losses through the Slit of the expansion ring affected.

The sealing ring is advantageously made of polyethylene, the expansion ring from a copolymer of polymethylene oxide and the springs Spring steel.

Fig. 1

den diametralen Längsschnitt einer ersten Ausführungsform eines dreiteiligen teleskopierbaren Staubsauger-Saugrohres, bei welchen das Innenrohr und das Außenrohr durch eine bekannte Klemmkeilverrastung und das Außenrohr mit dem dritten Rohr jeweils in entgegengesetzter Richtung durch kegelstumpfförmige Endbereiche miteinander gekuppelt sind,

Fig. 2

den Endbereich zwischen dem Außenrohr und dem dritten Rohr von Fig. 1 in vergrößerter Darstellung in gekuppelter Position,

Fig. 3

die Ansicht von Fig. 2 bei entkuppelter Lage von Außenrohr und drittem Rohr,

Fig. 4

eine zweite Ausführungsform einer Kupplungsverbindung zwischen dem Außen- und dem Innenrohr mit einer Dichtungshülse mit kegelstumpfförmiger Innenumfangsfläche in gekuppelter Lage,

Fig. 5

die Ansicht von Fig. 4 in entkuppelter Lage,

Fig. 6

eine dritte Ausführungsform einer Kupplungsverbindung zwischen dem Außenrohr und dem drittem Rohr mittels einer Hebelraste in gekuppelter Lage,

Fig. 6a

die Ausschnittvergrößerung 6a von Fig. 6,

Fig. 7

die Ansicht von Fig. 6 in entkuppelter Position von Außenrohr und drittem Rohr,

Fig. 7a

die Ausschnittvergrößerung 7a von Fig. 7,

Fig. 8

eine vierte Ausführungsform einer Kupplung zwischen dem Außenrohr und dem drittem Rohr mittels eines Rastknopfes, der unter Wirkung einer Blatt- oder Kegelfeder in einer Vertiefung des Außenrohres steht,

Fig. 9

die Draufsicht in Richtung des Pfeiles IX von Fig. 8,

Fig. 10

die Querschnittsansicht entlang der Linie X/X von Fig. 9,

Fig. 11

den Längsschnitt von Fig. 8 mit einer in das Außenrohr eingesetzten Hülse mit einer Mulde zur Aufnahme einer Blatt- oder Kegelfeder als fünfte Ausführungsform,

Fig. 12

die Ausschnittvergrößerung von Fig. 11 mit einem unter Wirkung einer bügelartigen Blattfeder stehenden Rastknopf,

Fig. 13

die Ausschnittvergrößerung XII von Fig. 11 mit einem unter Wirkung einer Kegelfeder stehenden Rastknopf,

Fig. 14

als sechste Ausführungform den diametralen Längsschnitt des Außerohres und des übergreifenden dritten Rohres, die mittels eines Druckknopfes gekuppelt sind, der unter Wirkung einer Teilringfeder auf der Innenumfangsfläche des Außenrohres steht,

Fig. 15

die Schnittansicht entlang der Linie XV/XV von Fig. 14,

Fig. 16

eine teilweise Schnittansicht auf eine siebte Ausführungsform einer Kupplung zwischen Außenrohr und bei aufgeschnittenem dritten Rohr mittels eines auf der Außenumfangsfläche des Außenrohres angeordneten Spreizringes aus Kunststoff in gekuppelter Position,

Fig. 17

die Ansicht von Fig. 16 in entkuppelter Position und

Fig. 18

die Ansicht des Außenrohres mit dem aufgesetzten Spreizring der Fig. 16 und 17.

Several previously discussed exemplary embodiments are described below with reference to the drawings. Show:

Fig. 1

the diametrical longitudinal section of a first embodiment of a three-part telescopic vacuum cleaner suction tube, in which the inner tube and the outer tube are coupled to one another in the opposite direction by a truncated cone-shaped end region by means of a known clamping wedge locking and the outer tube to the third tube,

Fig. 2

the end region between the outer tube and the third tube of FIG. 1 in an enlarged view in the coupled position,

Fig. 3

2 with the uncoupled position of the outer tube and the third tube,

Fig. 4

A second embodiment of a coupling connection between the outer and the inner tube with a sealing sleeve with a frustoconical inner circumferential surface in a coupled position,

Fig. 5

4 in the uncoupled position,

Fig. 6

A third embodiment of a coupling connection between the outer tube and the third tube by means of a lever catch in a coupled position,

Fig. 6a

the enlarged section 6a of FIG. 6,

Fig. 7

6 in the uncoupled position of the outer tube and the third tube,

Fig. 7a

the enlarged section 7a of FIG. 7,

Fig. 8

A fourth embodiment of a coupling between the outer tube and the third tube by means of a locking button, which is under the action of a leaf or conical spring in a recess of the outer tube,

Fig. 9

the top view in the direction of arrow IX of Fig. 8,

Fig. 10

the cross-sectional view along the line X / X of Fig. 9,

Fig. 11

8 with a sleeve inserted into the outer tube with a trough for receiving a leaf or conical spring as a fifth embodiment,

Fig. 12

11 shows the enlargement of a section with a detent button under the action of a bow-like leaf spring

Fig. 13

11 shows the detail enlargement XII of FIG. 11 with a locking button under the action of a conical spring,

Fig. 14

as a sixth embodiment, the diametrical longitudinal section of the outer tube and the overlapping third tube, which are coupled by means of a push button which, under the action of a partial ring spring, stands on the inner circumferential surface of the outer tube,

Fig. 15

the sectional view along the line XV / XV of Fig. 14,

Fig. 16

3 shows a partial sectional view of a seventh embodiment of a coupling between the outer tube and, in the case of a cut third tube, by means of a plastic expansion ring arranged on the outer circumferential surface of the outer tube in a coupled position,

Fig. 17

the view of Fig. 16 in the uncoupled position and

Fig. 18

the view of the outer tube with the spreader ring of FIGS. 16 and 17.

The three-part telescopic vacuum cleaner suction pipe 1 according to Fig. 1 consists of an inner tube 2, an outer tube 3 and one Outer tube 3 at its end 3a overlapping third tube 4. Das Inner tube 2 is connected to the outer tube 3 by means of a DE 195 28 814 C1 known locking connection coupled together, the is not the subject of the present invention. In this known Locking connection, the inner tube 2 is provided with locking recesses into which a coupling the outer tube 3 with it as well as manually actuable slide 6 or push button unlockable, under effect a spring 7 standing locking element 8 in the form of two clamping wedges intervenes.

According to the invention, the outer tube 3 is on its inner tube 2 End 3a facing away from a third tube 4. The Outer tube 3 is extended with the third tube 4 in the illustrated 1 near the end regions 3a, 4a of the two Pipes 3, 4 either through a non-positive and / or a positive locking element detachably coupled. In the illustrated 1, the locking element consists of a non-positive connection, namely from a truncated cone End region 4a of the third tube 4 and from one in opposite Direction frustoconical end 3a of the outer tube 3, those in the extended telescopic position shown with their each other facing lateral surfaces 3b, 4b also form the seal 3b, 4b.

In Fig. 2 is the positive connection in an enlarged view Coupling of the outer tube 3 with the third tube 4 of FIG. 1 3, while FIG. 3 shows the loose position of FIG. 2 of the two pipes 3 and Figure 4 shows after the outer tube 3 in the direction of arrow 9 of Fig. 2 is inserted into the outer tube 4. In the extended position 2 form the mutually facing lateral surfaces 3b of the Outer tube in connection with the inner surface 4b of the third Tube 4 a frictional and airtight friction connection. A additional seal is therefore unnecessary in this embodiment.

Since the parts of Fig. 2 and 3 with the parts of Fig. 1st match, corresponding reference numerals have also been used.

The airflow for the three-part telescopic vacuum cleaner suction pipe always takes place in the direction of arrow 10, that is to say in the image planes of right to left.

2 and 3 it is clear that a transfer of Locking element 8 in the locking recesses in the inner tube 2 not on one Coupling between the outer tube 3 and the inner tube 4 transferable is because then the inner tube 2 is no longer in the outer tube 3 in the area move this coupling between outer tube 3 and inner tube 2 would let.

4 and 5 is a modification of the non-positive Locking element 3b, 4b shown in FIGS. 1 to 3. In it the third pipe 4 at its end 4a facing the outer pipe 3 a widened area 4c and the inner peripheral surface 4d this widened area 4c in a rotationally fixed manner with a sealing sleeve 11 Connected from plastic with its frustoconical Inner peripheral surface 11a with that in the opposite direction frustoconical outer circumferential surface 3b of the Outer tube 3 at this end portion 3a, the locking element and forms the sealing element 11a-3b. The connection of the Sealing sleeve 11 is carried out with the overlapping third tube 4 either by means of an adhesive layer or - as shown - over cam-like extensions 12 of the sealing sleeve 11, which in corresponding Engage openings 13 of the third tube 4. By inserting the Outer tube 3 in the direction of arrow 9 in the third tube 4 is the non-positive connection between the outer surface 3b of the Outer tube 3 and the inner peripheral surface 11 a of the sealing sleeve 11 solved so that the two tubes 3, 4 are slidable into each other. in the Outside the sealing sleeve 11 closes at a recess 14 flush with the end face 15 of the tube 4.

6, 6a and 7 and 7a is a third embodiment a now interlocking locking element between the Outer tube 3 and the third tube 4 shown. This form-fitting Locking element, which is generally identified with the reference number 16 is composed of a on the end portion 4a Outer peripheral surface 4e of the third tube 4 arranged lever catch 17, which is at one end 17b on the outer peripheral surface 4e of the third tube 4 supports and with its other end 17c under effect a spring 18 engages in a locking opening 19 in the outer tube 3. The In this embodiment, the seal is provided by a plastic ring 20 formed on the inner circumferential surface 4d of the third tube 4 rotatably arranged and with a passage opening 21 for the end 17c of the Lever catch 17 is provided.

7a in the direction of Arrow 38 pivoted clockwise, the end 17c of the Lever catch 17 raised such that its surface 17a is flush with the Inner peripheral surface 20a of the plastic sealing ring 20 closes. In this raised position is the outer tube 3 from the third tube 4 uncoupled. Then the outer tube 3 can be telescoped in the direction of Arrow 9 are inserted into the third tube 4, as shown in FIG. 7 is shown.

8 to 10, the locking element 16 consists of a Locking button 22, under the action of a leaf spring 23 or according to the Fig. 13 is under the action of a conical spring 24, the one with End 23a or 24a in a trough 25 on the outer peripheral surface 3b of the Outer tube 3 supports and with its other end 23b or 24b Locking button 22 through an opening 26 of a sealing ring 27 in presses a locking opening 28 of the third tube 4. Here is the Leaf spring 23 as a flat bow spring and the conical spring 24 such trained that all spring turns in the interior of the previous turn find place, being in the pressed position on the block the total height of the conical spring is equal to or slightly greater than the thickness the largest turn.

As is apparent from FIGS. 9 and 10 in connection with FIG. 8, the Trough 25 on the outer peripheral surface 3b of the outer tube 3 rectangular formed and provided with tapered side surfaces 25a.

In the embodiment of FIGS. 11 to 13, the trough 25 is in one thin ring sleeve 40 arranged with the inner peripheral surface 3c of the Outer tube 3 is connected. Otherwise, with FIGS. 8 to 10 Matching parts have the same reference numbers. This Embodiment according to FIGS. 11 to 13 has the manufacturing engineering preference of smooth pipe ends 3a, 4a while the trough 25 is arranged in a thin additional sleeve 40.

In the further embodiment of FIGS. 14 and 15, this is Locking element 16 formed by a push button 29, the under Effect of a leaf-like partial ring spring 30 is on the Inner circumferential surface 3c of the outer tube 3 is arranged and by a Opening 31 in the outer tube 3 and through an outer tube 3 in this Area encompassing plastic sealing ring 32 into a Locking opening 33 of the third tube 4 engages. In this The embodiment is the spring 30 as one of the Inner circumferential surface 3c of the outer tube 3 nestling partial ring spring educated.

16 to 18 is a further locking element 16 disclosed which of a on the outer peripheral surface 3b of the Outer tube 3 arranged, provided with a slot 34 Spreading ring 35 is formed of plastic, with its Outer peripheral surface 35a at the corresponding end region 4a of the Inner circumferential surface 4b of the third tube 4 abuts and at one Relative rotation of the two tubes 3, 4 to each other in the direction of Arrow 39 of FIG. 17 from a projection 36 on the Outer peripheral surface 3b of the outer tube 3, which is in a spiral Slot guide 37 of the expansion ring 35 engages in one direction spread apart and contracted in the other direction. The expanded position of the expansion ring 35 is in Fig. 16 and the The contracted position of the expansion ring 35 in FIGS. 17 and 18 shown. As is clear from a comparison of the width B of the slot 34 16, slot 34 is wider in this figure than in FIG 17 and 18. In the spread position according to FIG. 16, this is Outer tube 3 coupled to the inner tube 4. This coupling takes place by pressing the expansion ring 35 with its Outer peripheral surface 35a on the inner peripheral surface 4b of the Outer tube 4 on the one hand and with its inner peripheral surface on the Outer peripheral surface 3b of the outer tube 3 on the other hand. Based on these The outer tube 3 with the third tube 4 becomes a friction clutch Detachably connected in the extended telescopic position.

In all exemplary embodiments, the air flow takes place in the direction of arrow 10 from the right half of the picture to the left half of the picture. This means that in all cases, the air flows through the telescopic vacuum cleaner suction pipe 1 contrary to the stovepipe principle. While the stovepipe principle teaches that flue gases are conducted through a continuously expanding flow cross section, the air flow in the vacuum cleaner suction pipe 1 according to FIG. 1 takes place in exactly the opposite direction, namely from a relatively large cross section Q _{1 of} the third pipe 4 into one smaller cross section Q ₂ in the outer tube 3 and from there into the smallest cross section Q _{3 of} the inner tube 2.

According to the feature d) of the main claim, the cross sections Q ₁ , Q ₂ and Q ₃ are dimensioned such that the inner cross section Q _{2 of} the outer tube 3 at the height of the seal 27 and thus also at the height, for example, of the trough 25 of FIGS. 8 and 11 or larger than the smallest flow cross section Q _{3 of} the inner tube 2 of the vacuum cleaner suction tube 1 is formed.

Reference symbol list:

Three-part, telescopic Vacuum cleaner suction pipe

1

Inner tube

2nd

Outer tube

3rd

End of outer tube 3

3a

Outer surface of outer tube 3

3b

Inner surface of outer tube 3

3c

third tube

4th

End area of tube 4

4a

Shell surface of tube 4

4b

widened area of tube 4

4c

Inner peripheral surface of area 4c

4d

Outer peripheral surface of tube 4

4e

Slider

6

feather

7, 18

Locking element

8th

Directional arrows

9, 10, 38, 39

Sealing sleeve

11

Inner circumferential surface of the sealing sleeve 11

11a

cam-like extensions of the sealing sleeve 11

12th

openings

13

Return

14

Face of the tube 4

15

Locking element

16

Lever catch

17th

Area of rest

17a

Ends of the lever catch 17

17b, 17c

Rest opening

19, 28, 33

Plastic ring

20th

Inner circumferential surface of the Plastic ring 20

20a

Access opening in plastic ring 20

21

Locking button

22

Leaf spring

23

Ends of spring 23

23a, 23b

Cone spring

24th

Ends of spring 24

24a, 24b

trough

25th

Side surfaces of the trough 25

25a

Opening in sealing ring 27

26

Sealing ring

27, 32

Push button

29

feather

30th

Opening in the outer tube 3

31

Slot in expansion ring 35

34

Spreader ring

35

Outer peripheral surface of expansion ring 35

35a

head Start

36

Slot guide

37

Ring sleeve

40

Width of the slot 34

B

Cross section of tube 4

Q ₁

Cross section of outer tube 3

Q ₂

Cross section of inner tube 2

Q ₃

Claims (10)

Telescopic vacuum cleaner suction tube with an outer tube and an inner tube with locking recesses into which a locking element engages, which is coupled to the outer tube and can be unlocked under the action of a spring and can be unlocked by means of a manually operated slide or push button, characterized by the following features: a) the outer tube (3) is at its end remote from the inner tube (2) (3a) end of a third tube (4) telescopically, b) the outer tube (3) is in the extended position with the third tube (4) in the vicinity of the end regions (3a, 4a) of both tubes (3, 4) either by a non-positive and / or positive locking element (3b, 4b; 3b , 11a; 17; 22; 29; 35) detachably coupled, c) the annular gap between the outer tube (3) and the third tube (4) is in the extended position at the end regions (3a, 4a) of both tubes (3, 4) by a seal (3b, 4b; 11; 20; 27; 32; 35) sealed, d) the inner cross-section (Q ₂ ) of the outer tube (3) at the level of the seal (3b, 4b; 11; 20; 27; 32; 35) and the coupling locking element is equal to or larger than the smallest flow cross-section (Q ₃ ) of the vacuum cleaner -Suction tube (1) formed and e) the inner tube (2), the outer tube (3) and the third tube (4) have a total length between 420 mm and 570 mm in the fully pushed-together position and a length between 890 mm and 1230 mm in the fully extended position. Telescopic vacuum cleaner suction pipe according to claim 1, characterized in that the locking element consists of a lever catch (16) which is arranged on the end region (4a) of the outer peripheral surface (4c) of the third tube (4) and which has one end on the outer peripheral surface ( 4a) supports the third tube (4) and engages with its other locking end (17) under the action of a spring (18) through an opening in the end region of the third tube (4) into a locking opening (19) in the outer tube (3) and the seal is formed by a plastic ring (20) which is arranged on the inner circumferential surface (4d) of the third tube (4) in a rotationally fixed manner and is provided with a through opening (21) for the latching end (17) of the lever latch (16). Telescopic vacuum cleaner suction pipe according to claim 1, characterized in that the locking element is formed by a push button (29) which, under the action of a spring (30), is arranged standing on the inner peripheral surface (3c) of the outer pipe (3) and through an opening ( 31) engages in a locking opening (33) of the third tube (4) in the outer tube (3) and through a further sealing ring (32) made of plastic encompassing the outer tube (3) in this area. Telescopic vacuum cleaner suction pipe according to claim 3, characterized in that the spring (30) consists of a partial ring spring which clings to the inner peripheral surface (3c) of the outer pipe (3). Telescopic vacuum cleaner suction pipe according to claim 1, characterized in that the locking element consists of a latching button (22) which is under the action of a leaf spring (23) or a conical spring (24) which with one end (23a, 24a) in a trough (25) is supported on the outer circumferential surface (3b) of the outer tube (3) and the other end 23b, 24b) of the locking button (22) through an opening (26) in a sealing ring (27) into a locking opening (28) of the third tube (4) presses. Telescopic vacuum cleaner suction pipe according to claim 5, characterized in that the leaf spring (23) is designed as a flat bow spring and the conical spring (24) is such that all spring windings find space in the interior of the previous winding, the total height in a pressed position the conical spring is equal to or slightly larger than the thickness of the largest turn. Telescopic vacuum cleaner suction pipe according to claim 1, characterized in that the locking element consists of a frustoconical end region (4a) of the third pipe (4) and an opposite frustoconical end (3a) of the outer pipe (3), which is in the extended telescopic position with their mutually facing jacket surfaces (4b, 3b) also form the seal (3b, 4b). Telescopic vacuum cleaner suction pipe according to claim 1, characterized in that the third pipe (4) is provided with a widened area (4c) at its end (4a) facing the outer pipe (3) and the inner peripheral surface (4d) of the widened area (4c) is rotatably connected to a sealing sleeve (11) made of plastic, which forms the locking element (11a, 3b) and the sealing element with its frustoconical inner circumferential surface (11a) with the frustoconical outer circumferential surface (3b) of the outer tube (3). Telescopic vacuum cleaner suction pipe according to claim 1, characterized in that the locking element is formed by a plastic expansion ring (35) which is arranged on the outer circumferential surface (3b) of the outer pipe (3) and is provided with a slot (34) and which with its outer circumferential surface ( 35a) abuts the corresponding end region (4a) of the inner circumferential surface (4b) of the third tube (4) and, when the two tubes (3, 4) rotate relative to one another, from a projection (36) on the outer circumferential surface (3b) of the outer tube (3) , which engages in a spiral slot guide (37) of the expansion ring (35), spread in one direction and contracted in the other direction. Telescopic vacuum cleaner suction pipe according to one of claims 1 to 9, characterized in that the sealing rings (17, 20, 27, 32) made of polyethylene, the expansion ring (35) made of a copolymer of the polymethylene oxide and the springs (18, 23, 24, 30) are made of spring steel.

Images