DE29510671U1 - Telescopic vacuum cleaner suction pipe - Google Patents

Description

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Dipl.-lng. Harald OStriga
Dipl.-lng. Bernd Sonnet*
Dipl.-lng. Jochen-Peter Wirths

* Authorized by the European Patent Office 42275 Wuppertal-Bannen

Ostriga, Sonnet & Wirths ■ PO Box 20 16 53 ■ D-422J6 Wuppertal

0/g

Applicant: Carl Froh Röhrenwerk GmbH & Co

Hachener Str. 167
10

59846 Sundern

Designation

of the invention: Telescopic vacuum cleaner suction tube

The invention relates to a telescopic vacuum cleaner suction tube according to the preamble of claim 1. Such a telescopic vacuum cleaner suction tube is described in EP-B1-0 293 518.

In the known vacuum cleaner suction pipe, the plastic ring body is arranged inside an expansion of the outer tube. The hold-down device, which also forms a control body for the locking body, is guided in its movement in the relatively voluminous plastic ring body.

Based on the telescopic vacuum cleaner suction pipe according to EP-B1-0 293 518, which has proven itself in practice, the invention is based on the task of creating a vacuum cleaner suction pipe that is easy to assemble and has a simple design.

According to the invention, this object is achieved in that a hold-down housing is provided to accommodate the hold-down device, which has an approximately trough-like cross-section

Postgiro office Credit- und Volksbank cGmbH Commcrznank AG VAT ID No. Eat Wuppertal-Barmen Wuppertal-Barmcn VAT No. (Bank code 360 iOO 43) 445 04-431 fBLZ 330 SOO 98) 301 891 024 (Bank code 330 400 01)4 034 823 DE 121068676

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section, a receiving area for the hold-down device and, on both sides diametrically opposite the receiving area, outward-facing edge support flanges, that the hold-down housing with its trough bottom first is pushed through from the inside through the recess in the outer tube, which represents a through recess, whereby the support flanges are supported with their flange outer surfaces on the inner surface of the outer tube and at the same time with their flange inner surfaces on the outer surface of the plastic ring body, and that the receiving area of the hold-down housing forms at least one actuating opening for the hold-down device.

The particular advantage of the invention is that the hold-down housing is easily pushed through a through-hole provided in the outer tube with its trough bottom first when assembling the vacuum cleaner suction pipe. The outer surfaces of the flange are supported on the inner surface of the outer tube. The plastic ring body is then pushed in axially and fastened to the outer tube, in particular locked onto the latter. The outer surface of the plastic ring body supports the inner surfaces of the support flanges. In this way, the hold-down housing is very easily locked in place with a positive fit and immovably. Of course, additional fastening of the support flanges to the inner surface of the outer tube, for example by gluing, welding or soldering, is possible, but not necessary.

In a further embodiment of the invention, the receiving area of the hold-down housing also forms the free space in

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which the locking body, e.g. a ball or a roller, can move into the release position of the hold-down device.

It is also advantageous according to the invention that the receiving area of the hold-down housing forms guide surfaces for the hold-down movement, optionally including an actuating opening for the hold-down.

Another embodiment of the invention consists in that the plastic ring body is recessed to accommodate the support flanges. However, such a recess is not absolutely necessary if a resilient radial inward movement of the plastic ring body to accommodate the support flanges is preferred.
15

Another advantageous embodiment consists in that the trough bottom of the hold-down housing forms the actuating opening, through which an actuating extension of the hold-down extends.
20

It is advisable to attach a handle to the outside of the operating extension.

According to further features of the invention, the assembly is also simplified in that the hold-down device, including its actuating extension, has a T-shaped cross section, whereby the hold-down device region with the control body represents the T-crossbar and the actuating extension represents the T-longitudinal bar.
30

The above-described features of the invention allow a through-mounting of the hold-down device, whereby this

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The actuating extension is pushed through the actuating opening from the hollow side of the assembled hold-down housing with its actuating extension. The subsequently mounted plastic ring body engages under the hold-down area, which forms the control body, and thus also locks the hold-down in its final installation position.

A particular advantage of the telescopic vacuum cleaner suction pipe according to the invention is that the outer pipe is formed without expansion and that the plastic ring body is arranged in a sliding seat gap that is usual between the outer pipe and the inner pipe. This means that instead of an expansion of the outer pipe (cf. EP-B1-0 293 518), only a relatively small component, namely the hold-down housing, which is gripped by an operating handle, protrudes outwards. Otherwise, the observer in the area of the operating handle only sees the smooth outer surface of the outer pipe without expansion, which, thanks to the usual small sliding seat gap, transitions essentially seamlessly to the inner pipe.

Similar to the vacuum cleaner suction pipe according to EP-B1-0 293 518, the subject matter of the invention also offers the alternative, according to which the longitudinal axis of the through-hole and the direction of movement of the hold-down device extend in the direction of the pipe’s longitudinal axis (straight slide actuation) or, alternatively, according to which the longitudinal axis of the through-hole and the direction of movement of the slide extend essentially transversely to the pipe’s longitudinal axis (rotary actuation). The first variant of the alternative represents the preferred embodiment.

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form of construction in which the actuating handle is to be moved translationally in the longitudinal direction of the pipe.

A further embodiment of the invention is characterized in that at least one side wall of the hold-down housing forms a through-opening for the through-mounting of the locking body, which is designed in particular as a roller.

In a further embodiment of the invention, the through-opening for the locking body can be closed by means of the handle, which laterally overlaps the hold-down housing, so that the locking body can be fixed in its installation position in a very simple manner.

The invention is illustrated in the drawings using a preferred embodiment, it shows

Fig. 1 an axial section through a telescopic vacuum cleaner suction tube,

Fig. 2 shows a radial section according to the bent section line II-II in Fig. 1,

Fig. 3 is a partial top view with the operating handle removed, otherwise approximately corresponding to the view arrow marked III in Fig. 1 and

Fig. 4 shows a radial section, partly with visible edges, corresponding to the section line marked IV-IV in Fig. 3.

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In the drawings, a telescopic vacuum cleaner suction tube is provided with the reference number 10.

The vacuum cleaner suction pipe 10 has an outer pipe 11 and an inner pipe 12. The inner surface of the outer pipe 11 is designated by 13, its outer surface by 14. The inner surface of the inner pipe 12 is designated by 15, its outer surface by 16.

The inner tube 12 forms a locking strip R, which consists of individual locking recesses 17, which cooperate with a locking body 18 designed as a roller.

In the annular gap S, which represents a conventional sliding seat gap, between the inner surface 13 of the outer tube 11 and the outer surface 16 of the inner tube 12, there is a plastic ring body 19 which is held on the outer tube 11 by means of a locking recess 20.

The plastic ring body 19 also has a radially inward-pointing longitudinal rib 21, which together with a longitudinal groove 22 on the inner tube side forms an anti-twisting device that ensures that the locking body 18 and locking recesses 17 do not accidentally disengage.

The outer tube 11 forms a longitudinal recess 23 of approximately rectangular basic shape (see Fig. 3 and 4), the longer axis of which extends parallel to the longitudinal center axis (longitudinal tube axis) x of the two tubes 11, 12.

For locking and releasing the locking body 18, a hold-down device designated as 24 is provided,

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which, according to Fig. 4, forms the cross section of a T. Here, its actuating extension 25 represents the T-longitudinal beam and the actual hold-down area with the control body 26 actuating the locking body 18 represents the T-cross beam.
5

To accommodate the hold-down device 24, a hold-down housing N is provided, which has an approximately trough-like cross-section. The hold-down housing N has a trough bottom 27, side walls 28, and support flanges 29 on the free edge areas of the side walls 28. The trough bottom 27 and side walls 28 describe a receiving area A for the hold-down device 24.

The hold-down housing N is pushed with its trough bottom 27 first from the inside through the longitudinal recess 23 of the outer tube 11, which forms a through-hole. The support flanges 29 are supported with their flange outer surfaces 30 on the inner surface 13 of the outer tube 11 and at the same time with their flange inner surfaces 31 on the outer surface 32 of the plastic ring body 19. To accommodate the support flanges 29, the outer surface 32 of the plastic ring body 19 is provided with recesses 33.

The control body 26 is provided with a ramp 34, which, when the hold-down device 24 is actuated in the closing or locking direction y, pushes the locking body 18 into the desired locking recess 17. The release movement of the hold-down device 24 takes place in the opening direction ζ against the restoring force of a helical compression spring 35, which is on the one hand attached to a retaining web 36 inside the hold-down device 24 and on the other hand

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is held on a tongue-like projection 37 of the trough bottom 27 of the hold-down housing N.

The trough bottom 27 has an actuating opening 44, through which the actuating extension 25 of the hold-down device 24 is inserted.

Each side wall 28 of the hold-down housing N has a through-opening 38 through which the roller-like locking body 18 can be inserted after the hold-down housing N has been mounted in the outer tube 11, while the hold-down 24 with its control body 26 is moved into its release position according to the opening direction ζ.

As soon as the roller-like locking body 18 is inserted, the actuating handle 39 can be snapped onto the actuating extension 25 from above. For this purpose, the actuating extension 25 has a locking opening 40 into which a spring-loaded locking pin 41, which is formed on the actuating handle 39, can engage. The actuating extension 39 therefore holds the roller 18 in its installation position.

In addition, the actuating extension 25 is laterally overlapped by spring-loaded locking projections 42 of the actuating handle 39. For this purpose, the side surfaces 43 of the actuating handle 39 are slightly undercut or slightly dovetail-shaped.

The actuating handle 39 and the hold-down device 24 are injection-molded bodies made of a suitable plastic.

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It is conceivable that the inner surfaces of the hold-down housing N simultaneously form guide surfaces for the movement of the hold-down 24 in its movement directions y and ζ.
5

The receiving area A of the hold-down housing N simultaneously forms a free space 45 into which the roller 18 can at least partially move when the hold-down 24 is moved into its release position in the opening direction ζ.

The guide opening in the plastic ring body 19 for the locking body 18 is designated 46.

Claims (12)

Carl Froh RöhreSiwferfe'GmijH; 8..-Cq %,:***. Claims 1. Telescopic vacuum cleaner suction tube (10) with an outer tube (11), with an axially extending locking strip (R), the locking recesses (17) of which are embossed into the wall of the inner tube (12), with a (17) cooperating, outer tube (11) and inner tube (12) axially releasably locking relative to one another, held approximately radially movable on the outer tube (11), lockable by a hold-down device (24) locking body (18), which by means of the control body (26) representing a control body (26) independent of the locking body (18) movable hold-down device (24) can be placed in a blocking or release position with respect to the respective locking recess (17), wherein the hold-down device (24) in its blocking position overlies the locking body (18) and in its release position opens a free space (45) towards the locking recess, wherein a form-locking lock (21, 22) preventing relative rotation between the inner (12) and outer tube (11) is provided between the outer tube (11) and the inner tube (12), wherein a plastic ring body (19) is arranged in an intermediate space (S) between the outer tube (11) and the inner tube (12), which has an opening (46) for guiding the locking body (18), and wherein the outer tube (11) has a recess (23) through which the hold-down device (24) at least partially passes, characterized in that a hold-down housing (N) is provided for receiving the hold-down device (24), which, having an approximately trough-like cross-section, has a receiving area (A) for the hold-down device (N) and, on both sides diametrically opposite the receiving area (A), outwardly directed edge support flanges (29), that the hold-down housing (N) with its trough bottom (27) Carl Froh Tubework.qjnfH; &.*Cq *,.&iacgr;*'*· - 11 is pushed through from the inside through the recess (23) of the outer tube (11), which represents a push-through recess, the support flanges (29) being supported with their flange outer surfaces (30) on the inner surface (13) of the outer tube (11) and at the same time with their flange inner surfaces (31) on the outer surface (32) of the plastic ring body (19), and that the receiving area (A) of the hold-down housing (N) forms at least one actuating opening (44) for the hold-down device (24).
10 2. Telescopic vacuum cleaner suction tube according to claim 1, characterized in that the plastic ring body (19) is recessed (at 33) to accommodate the support flanges (29). 3. Telescopic vacuum cleaner suction pipe according to claim 1 or claim 2, characterized in that the trough bottom (27) of the hold-down housing (N) forms the actuating opening (44) through which an actuating extension (25) of the hold-down (24) passes. 4. Telescopic vacuum cleaner suction tube according to claim 3, characterized in that a handle (39) is attached to the outside of the actuating extension (25). 5. Telescopic vacuum cleaner suction tube according to one of claims 1 to 4, characterized in that the hold-down device (24) including its actuating extension (25) has a T-shaped cross section, the hold-down device region with the control body (26) representing the T-crossbar and the actuating extension (25) representing the T-longitudinal bar. Carl Froh Röhreiaw«:r££»Gnifc>H· & ,Co t * *··, 6. Telescopic vacuum cleaner suction tube according to one of claims 1 to 5, characterized in that the outer tube (11) is formed without expansion and that the plastic ring body (19) is in a between the outer tube (11) and the inner tube (12) usual sliding seat gap (S). 7. Telescopic vacuum cleaner suction tube according to one of claims 1 to 6, characterized in that the longitudinal axis of the through-hole (23) and the direction of movement (y, z) of the hold-down device (24) extend in the direction of the tube longitudinal axis (x). 8. Telescopic vacuum cleaner suction tube according to one of claims 1 to 6, characterized in that the longitudinal axis of the through-hole (23) and the direction of movement of the hold-down device extend substantially transversely to the tube longitudinal axis (x). 9. Telescopic vacuum cleaner suction tube according to one of claims 1 to 8, characterized in that the receiving area (A) of the hold-down housing (N) also forms a free space (45) for receiving the locking body (18) in the release position of the hold-down (24). 10. Telescopic vacuum cleaner suction tube according to one of claims 1 to 9, characterized in that the receiving area (A) of the hold-down housing (N), optionally including the actuating opening (44), forms guide surfaces for the hold-down device (24). 11. Telescopic vacuum cleaner suction tube according to one of claims 9 to 10, characterized in that at least Carl Froh Rohreawdrk. GmfcH» & -Co · ; ···. - 13 - a side wall (28) of the hold-down housing (N) forms a through-opening (38) for the through-mounting of the locking body, which is designed in particular as a roller (18). 12. Telescopic vacuum cleaner suction tube according to claim 11, characterized in that the through-opening (38) for the locking body (18) can be closed by means of the handle (39) which laterally engages over the hold-down housing (N).
10