EP2772174A2 - Vacuum cleaner suction tube - Google Patents

Abstract

The suction tube (1) has a latching projection portion (2) that is formed in an end portion (3) of the suction tube, and made of same material as the suction tube. The latching projection portion is extended from a central axis of the suction tube to the exterior such that a latching edge of the projection portion is arranged in a plane normal to the central axis, and positioned in averted side of the projection portion.

Description

The invention relates to a vacuum cleaner suction tube, with at least one latching projection, wherein the latching projection is formed in an end region of the vacuum cleaner suction tube, and wherein the latching projection is formed from the material of the vacuum cleaner suction tube.

Vacuum cleaner suction pipes are known in the art in a variety of configurations. Vacuum cleaner suction pipes are often made of a stainless steel, wherein at least in the two end regions of a vacuum cleaner suction tube attachment elements, for example made of plastic, are attached. The attachments are advantageously pushed onto the vacuum cleaner suction pipe or inserted into the vacuum cleaner suction pipe. A special requirement is the leak-free sealing between the vacuum cleaner suction pipe and the add-on element.

The known from the prior art vacuum cleaner suction pipes often have the disadvantage that a reliable seal, especially when using certain plastics for the attachment, between vacuum cleaner suction pipe and the attachment can not be sufficiently ensured.

Based on the aforementioned prior art, therefore, the object of the invention is to specify a vacuum cleaner suction tube which enables a reliable and leak-free connection with an attachment element when using any type of plastic for the attachment element.

The above object is initially and essentially achieved in a vacuum cleaner suction pipe according to the invention in that the latching projection is formed starting from the central axis of the vacuum cleaner suction tube to the outside, that the locking projection has a locking edge, that the locking edge lies in a plane whose plane normal is the center axis of the vacuum cleaner suction tube, and that the latching edge is arranged on the side facing away from the end region of the latching projection.

The vacuum cleaner suction tube consequently has in an end region, preferably in the end region oriented in the use state on the bottom side, for fastening, for example, an add-on element, for. As a nozzle or nozzle, at least one locking projection, which is formed from the material of the vacuum cleaner suction tube. Preferably, the material of the vacuum cleaner suction tube is brought by local plastic deformation in the shape of the locking projection. The latching projection is thus formed in the direction away from the center axis of the vacuum cleaner suction pipe, to the outside. By the latching projection, which is formed to the outside, consequently, the outer circumference of the vacuum cleaner suction pipe is increased in the region of the latching projection. In other words, the locking projection is formed outwardly from the surface of the vacuum cleaner suction pipe - from the original surface. "Outgoing from the central axis" means that the locking projection is formed from a viewing direction, starting from the central axis of the material of the vacuum cleaner suction pipe to the outside.

Characterized in that the latching projection is formed in an end portion of the vacuum cleaner suction pipe to the outside, the power transmission between the mounting element made of plastic and the vacuum cleaner suction pipe is improved, so that an increased sealing effect is achieved. Furthermore, the use of polypropylene (PP) as a plastic for the attachments is made possible due to the improved power transmission, so that expensive plastics, such as polyoxymethylene (POM) can be dispensed with. Overall, can be achieved by using an outwardly arched locking projection greater robustness of the connection between the vacuum cleaner suction pipe and a mounting element made of plastic, for example, a nozzle for a floor nozzle.

The connection between an attachment and the vacuum cleaner suction pipe is prepared, for example, that the locking projection on the vacuum cleaner suction pipe in a correspondingly formed on the attachment catch recess - pocket - positively engages, creating a reliable locking connection between the vacuum cleaner suction pipe and attachment is made.

It is provided that the latching projection has a latching edge, and that the latching edge is formed orthogonal to the surface of the vacuum cleaner suction tube, in particular that the latching edge is arranged on the side facing away from the end portion of the latching projection. The locking edge is thus arranged orthogonally on the surface of the vacuum cleaner suction tube and thus lies in a plane whose level normal is the center axis of the vacuum cleaner suction tube. The latching edge is formed on the side facing away from the end region side of the latching projection, so that an attachment element in the assembled state between the end-side end face of the vacuum cleaner suction tube and the latching projection and the latching projections can be clamped. The latching edge of the latching projection and the end-side end edge of the vacuum cleaner suction tube are preferably arranged in mutually parallel planes.

The angle between the locking edge and the top of the locking projection is advantageously about 90 °. The locking projection is not designed to prevent rotation between attachment and vacuum cleaner suction tube. A rotation of the attachment element relative to the vacuum cleaner suction pipe is preferably prevented by the fact that the cross section of the vacuum cleaner suction tube is not rotationally symmetric, that is, for example, at least partially different radii, namely namely at least partially parabolic.

The locking projection is now made of the material of the vacuum cleaner suction tube, so that it has an increased stability, as he example, as the vacuum cleaner suction pipe is made of a stainless steel. The latching projection is for producing a positive connection with an attachment element, for. B. a nozzle nozzle, provided, wherein the attachment element is pushed onto the vacuum cleaner suction tube. The positive connection is insoluble in a proper use of the vacuum cleaner suction tube. The attachment is fixed in place by the latching with the locking projection.

The stability of the connection between the vacuum cleaner intake manifold and an attachment element is increased according to a first embodiment in that at least one second latching projection in the end region on the vacuum cleaner intake manifold is trained. The second latching projection is preferably formed identically to the first latching projection and also latched in a second latching recess formed on an attachment element for the second latching projection. It is advantageously provided that at most two locking projections are provided in the end region.

According to another embodiment, it has proven to be particularly advantageous if the first latching projection and the second latching projection are arranged opposite one another on the circumference of the vacuum cleaner suction tube. Such an arrangement of the first locking projection and the second locking projection results in an advantageous even distribution of power transmission from the attachment to the vacuum cleaner suction pipe. The first latching projection and the second latching projection preferably lie on an imaginary connecting line which connects the first latching projection, the center axis of the vacuum cleaner suction tube and the second latching projection. In particular, the distance between the upper side of the first latching projection and the upper side of the second latching projection is between 38 mm and 45 mm.

In order to simplify the mounting of an add-on element on the vacuum cleaner suction tube, it is provided according to a further embodiment that the latching projection has a run-on slope oriented in the direction of the end region, so that the height of the run-on slope increases with increasing distance to the end region. An attachment, which is provided for mounting on the vacuum cleaner suction pipe, can thus be pushed from the end direction to the vacuum cleaner suction tube, so that the attachment is guided over the run-up slope to the maximum height of the locking projection, so that then a snap of the Rasterücksprungs can be done on the attachment element on the locking projection.

It is further provided that the latching projection between the end of the run-on slope and the locking edge has a saddle surface. The saddle surface is in particular formed parallel to the surface of the vacuum cleaner suction tube. But it is also envisaged that the saddle surface lies in a plane which is arranged orthogonal to the plane of the locking edge. Preferably, the angle between the saddle surface and the locking edge is about 90 °. The length of the saddle surface, Thus, the distance between the end of the run-on slope and the locking edge is preferably between 1 mm and 2 mm, more preferably about 1.4 mm. The run-up slope has a slope between 12 ° and 20 °, has proven to be particularly advantageous for easy installation, a slope of about 16 °. The beginning of the run-up slope has a distance of about 4 mm to the end-side end edge of the vacuum cleaner suction pipe.

An advantageous power transmission between vacuum cleaner suction pipe and attachment element can be achieved according to a further embodiment in that the height of the locking edge is between 0.6 mm and 1 mm. In addition, it has been found that a reliable connection can be ensured thereby, if the distance between the end-side end face of the vacuum cleaner suction pipe and the locking edge is between 7 mm and 9 mm, in particular 8 mm.

It is also advantageous for the power transmission, if it is provided that the latching projection has a width between 5 mm and 20 mm. With the width of the latching projection, in particular the extension of the latching projection on the circumference of the vacuum cleaner suction pipe is meant. Particularly advantageous is a width of 10 mm.

According to a further embodiment, if it is provided that an attachment element is included, that the attachment element is pushed onto the vacuum cleaner suction tube at the end, that the attachment element has at least one latching recess on its inner circumference, that the latching recess is positively locked with the latching projection in that the catch recess lies at least partially against the latching edge, and that the add-on element is designed such that the positive latching is insoluble. The positive locking is thereby insoluble that the attachment has no means for releasing the positive connection. The attachment element consequently has at least one catch recess on its inner circumference, which is latched with the latching projection. The locking is thus insoluble. "Inextricably" in this context means that the catch is indeed releasable using tools and / or by destruction of the vacuum cleaner suction pipe or the attachment element, however, is not solvable in a proper use. A release of the catch during use is not provided. Preferably, the attachment element has two latching recesses which are formed corresponding to two oppositely arranged latching projections and latched thereto.

The connection is produced in that the attachment element is pushed onto the end of the vacuum cleaner suction tube, wherein the material of the attachment is at least temporarily - in the region of the locking projection or the locking projections - elastically deformed until the locking projection locks positively with the latching recess. Subsequently, a release is not provided and not possible without tools. A release of the locking is prevented in particular by the locking edge.

According to a further embodiment it is further provided that the attachment has on its inner circumference a counter edge for the end face of the vacuum cleaner suction tube, and that the attachment element is clamped between the end face and the locking edge. In the assembled state, the add-on element bears against the end-side end face of the vacuum cleaner suction tube with its counter-edge. At the same time, the locking edge abuts in the latch recess, so that the mounting element is reliably fixed in its position. The counter edge is preferably circumferential, so that the end edge rests completely against the opposite edge.

A further embodiment provides that the attachment is a nozzle, in particular a nozzle connection piece, and that the nozzle has at least one latching recess for latching with a suction tool. The latched with the vacuum cleaner suction pipe is therefore adapted to be locked with a suction tool, such as a floor nozzle. For this purpose, the nozzle has at least one latching recess in its outer circumference into which a latching projection of a suction tool can engage for the positive locking engagement. The nozzle is further adapted to be inserted into a suction tool.

According to a last embodiment, it is provided that the cross section of the vacuum cleaner suction tube has at least two regions, namely a circular arc-shaped first region and a parabolic second region. This cross section is provided in particular where the locking projection is arranged. These areas cause the vacuum cleaner suction tube to have a cross-section that is not rotationally symmetric, thereby improving stability. In addition, this shape of the cross section contributes to reliably preventing rotation of the attachment element relative to the vacuum cleaner suction tube. Preferably, the parabolic region forms a lower region of the cross section, wherein the arcuate region forms an upper region of the cross section covering the parabolic region. The circular arc-shaped region extends in particular over about 1/3 of the circumference, the parabolic region over 2/3 of the circumference. Preferably, the cross section of the vacuum cleaner suction tube is mirror-symmetrical to a plane in which the central axis and the at least one latching projection, in particular both latching projections lie.

The circular arc-shaped region preferably has a radius of about 30 mm, while the radii in the parabolic region vary between 30 mm and 60 mm. Preferably, in the two transition regions between the first region and the second region, a radius between 4 mm and 8 mm is formed, in particular 5 mm.

As already described, the use of a starting from the central axis or the surface of a vacuum cleaner suction tube arched outward locking projection on a vacuum cleaner suction pipe for permanent attachment of attachments to the vacuum cleaner suction pipe is particularly preferred. Advantageous attachments are, for example, connecting piece, which are pushed onto the vacuum cleaner suction pipe in the end and serve for connection of floor nozzles o. Ä.

Fig. 1

ein Ausführungsbeispiel eines Staubsauger-Saugrohrs in perspektivischer Ansicht,

Fig. 2

das Ausführungsbeispiel eines Staubsauger-Saugrohrs gemäß Fig. 1 in Seitenansicht,

Fig. 3

den Ausschnitt im Bereich A der Fig. 2,

Fig. 4

einen Ausschnitt im Bereich B der Fig. 2,

Fig. 5

ein Ausführungsbeispiel eines Staubsauger-Saugrohrs mit Anbauelement,

Fig. 6

einen Ausschnitt des Ausführungsbeispiels gemäß Fig. 5, und

Fig.7

ein Ausführungsbeispiel eines Staubsauger-Saugrohrs mit Anbauelement.

Specifically, there are now a variety of ways to design and further develop the vacuum cleaner suction tube. Reference is made to the claims subordinate to claim 1 and to the following description of preferred embodiments in conjunction with the drawings. In the drawing show:

Fig. 1

an embodiment of a vacuum cleaner suction tube in perspective view,

Fig. 2

the embodiment of a vacuum cleaner suction pipe according to Fig. 1 in side view,

Fig. 3

the section in area A of Fig. 2 .

Fig. 4

a section in area B of Fig. 2 .

Fig. 5

An embodiment of a vacuum cleaner suction pipe with attachment,

Fig. 6

a section of the embodiment according to Fig. 5 , and

Figure 7

an embodiment of a vacuum cleaner suction pipe with attachment.

Fig. 1 shows an embodiment of a vacuum cleaner suction pipe 1 in a perspective side view. The vacuum cleaner suction pipe 1 has a latching projection 2, which is arranged in an end region 3 of the vacuum cleaner suction pipe 1. The latching projection 2 is formed from the material of the vacuum cleaner suction pipe 1. In this embodiment, the material is a stainless steel. The latching projection 2 is thus formed outwardly starting from the surface 4 of the vacuum cleaner suction pipe 1, so that the latching projection 2 locally increases the circumference of the vacuum cleaner suction pipe 1 in the end region 3. The latching projection 2 is completely closed, so that no leakage air can penetrate from the outside into the vacuum cleaner suction pipe 1.

Fig. 2 shows the embodiment according to Fig. 1 in a side view. In the end region 3, a second latching projection 2 is provided on the vacuum cleaner suction tube 1, which is arranged opposite to the circumference of the vacuum cleaner suction tube 1 in this embodiment. Consequently, the first latching projection 2 and the second latching projection 2 lie together on an imaginary connecting line, which also includes the center axis of the vacuum cleaner suction tube 1.

Fig. 3 shows an enlargement of the area A of Fig. 2 in that the opposite arrangement can be seen on the circumference of the vacuum cleaner suction tube 1 of the latching projections 2. Fig. 3 shows the area A of the vacuum cleaner suction pipe 1 in a sectional view. The latching projections 2 each have a latching edge 5, which is arranged on the side facing away from the end portion 3 side of the respective latching projection 2. The locking edge 5 lies in a plane whose plane normal is the central axis of the vacuum cleaner suction pipe 1. The center axis of the vacuum cleaner suction pipe 1 thus passes through this plane orthogonal.

Fig. 4 shows an enlarged and sectioned section of the area B of Fig. 2. Fig. 4 It can be seen that the locking projection 2 opposite the locking edge 5 has a run-on slope 6, which in the assembly of a - in the Fig. 5 to 7 shown - extension member serves to perform this on the locking projection 2, so that a provided in the attachment latch catch with the latching projection 2 can lock. Starting from the central axis of the vacuum cleaner suction tube 1, the latching projection 2 is formed outwardly, ie away from the central axis of the vacuum cleaner suction tube 1. This has the advantage that the latching projection 2 is designed for fastening an attachment element made of the material of the vacuum cleaner suction tube 1 and therefore has an advantageous stability. Between the end of the run-on slope 6 and the locking edge 5, a saddle surface 7 is formed. The angle between the saddle surface 7 and the locking edge 5 is 90 °.

Fig. 5 shows an embodiment of a vacuum cleaner suction tube 1, which is locked with an attachment element 8. In particular, the two latching projections 2 are locked in a form-fitting manner with corresponding latching jumps on the inner circumference of the add-on element 8. Fig. 6 shows an enlargement of an area Fig. 5 , The latching projection 2 is positively locked with the catch recess, wherein the connection is insoluble, since the attachment has no means for releasing the locking. By the opposite arrangement of the locking projections 2, the locking is additionally stabilized. The attachment element 8 has on its inner periphery in addition a circumferential counter-edge 9, which cooperates with the end-side end face of the vacuum cleaner suction tube 1, so that the attachment element between the end face and the locking edge 5 is braced.

Fig. 7 shows an embodiment of a vacuum cleaner suction tube 1, which is locked with an attachment element 8. The attachment element 8 is formed in this embodiment as a nozzle connection piece and additionally has a latching recess 10, which is provided for latching with a - not shown - suction tool.

Claims (12)

Vacuum cleaner suction pipe (1), with at least one latching projection (2), wherein the latching projection (2) is formed in an end region (3) of the vacuum cleaner suction pipe (1), and wherein the latching projection (2) is made of the material of the vacuum cleaner. Suction tube (1) is formed,
characterized,
in that the latching projection (2) has a latching edge (5) such that the latching edge (5) lies in a plane whose plane normal is the central axis of the vacuum cleaner suction pipe (1), and that the latching edge (5) on the side facing away from the end region (3) side of the latching projection (2) is arranged. Vacuum cleaner suction pipe (1) according to claim 1, characterized in that at least one second latching projection (2) in the end region (3) on the vacuum cleaner suction pipe (1) is formed. Vacuum cleaner suction pipe (1) according to claim 2, characterized in that the first latching projection (2) and the second latching projection (2) on the circumference of the vacuum cleaner suction pipe (1) are arranged opposite one another. Vacuum cleaner suction tube (1) according to one of claims 1 to 3, characterized in that the latching projection (2) in the direction of the end region (3) oriented run-on slope (6), so that the height of the run-on slope (6) with increasing distance to the end region (3) increases. Vacuum cleaner suction pipe (1) according to one of claims 1 to 4, characterized in that the height of the locking edge (5) is between 0.6 mm and 1 mm. Vacuum cleaner suction pipe (1) according to one of claims 1 to 5, characterized in that the distance between the end face of the vacuum cleaner suction pipe (1) and the latching edge (5) is between 7 mm and 9 mm, in particular 8 mm. Vacuum cleaner suction tube (1) according to one of claims 1 to 6, characterized in that the latching projection (2) has a width between 5 mm and 20 mm, in particular has a width of 10 mm. Vacuum cleaner suction pipe (1) according to one of claims 1 to 7, characterized in that an attachment element (8) is included, that the attachment element end (8) is pushed onto the vacuum cleaner suction pipe (1) that the attachment element (8) Has on its inner circumference at least one latching recess that the latching recess with the latching projection (2) is positively locked by the latching recess at least partially against the locking edge (5), and that the attachment element (8) is designed such that the positive locking unsolvable is. Vacuum cleaner suction pipe (1) according to claim 8, characterized in that the attachment element (8) has on its inner periphery a counter edge (9) for the end face of the vacuum cleaner suction pipe (1), and that the attachment element (8) between the end face and the locking edge (5) is clamped. Vacuum cleaner suction pipe (1) according to claim 8 or 9, characterized in that the attachment element (8) is a nozzle, and that the nozzle has at least one latching recess (10) for latching with a suction tool. Vacuum cleaner suction pipe (1) according to one of claims 1 to 10, characterized in that the cross section of the vacuum cleaner suction pipe (1) has at least two regions, namely a circular arc-shaped first region and a parabolic second region. Use of a starting from the center axis of a vacuum cleaner suction pipe (1) outwardly arched locking projection (2) with a locking edge (5), wherein the locking edge (5) extends in a plane whose plane normal is the central axis, for the positive and permanent locking the vacuum cleaner suction pipe (1) with a mounting element (8).

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