EP3232891B1 - Suction hose connecting piece - Google Patents

Description

The invention relates to a suction hose connection piece for a suction hose for establishing a flow connection, in particular from a machine tool to a vacuum cleaner, according to the preamble of claim 1.

Due to the longitudinal latching, it is possible for the connection piece to be firmly held on the connection counterpart with respect to the quick-release axle. However, if there is a high load in the direction of pull or in the direction of the quick-release axle, the connection can be released. In particular when the plug-in section is also elastic, which makes it easier to connect to a suction hose connection that is usually relatively hard on a hand-held power tool, the longitudinal latching cannot be sufficiently resilient.

the end U.S. 2,198,905 a connection piece for a vacuum cleaner with a helical groove is known.

It is therefore the object of the present invention to provide an improved suction hose connection piece for a suction hose.

To solve the problem, a suction hose connection piece according to the technical teaching of claim 1 is provided.

The plug-in section can consist of a homogeneous soft or hard material, in particular plastic. A reinforcement of the plug-in section with at least one stiffening element is particularly preferred, which will be explained below. The plug-in section has at least one section of the flow channel.

It is a basic idea that the rotary form-fitting contour with the rotary form-fitting counter-contour represents an optimal hold with regard to the longitudinal axis. With regard to a quick-release axle or the longitudinal axis, there is in any case a better hold than just the longitudinal latching.

The material of the plug-in section is advantageously elastic or elastically yielding, as a result of which the longitudinal latching is advantageously easier to produce or release. If the at least one rotary form-fitting contour is also present on the elastic or yielding, in any case relatively soft, section of the plug-in section, this can also enable easy latching, but on the other hand also a firm hold. For example, a friction fit between the material of the plug-in section, which is relatively soft, and the mating connector ensures optimum hold on the mating connector

However, the connecting counterpart can also have only one counter-contour for rotational locking or only one longitudinal counter-locking contour. The connection piece is compatible with both types of connection counterparts, as it has a longitudinal snap-in contour and at least one rotary form-fitting contour. Thus, the connection piece according to the invention can interact with, so to speak, old, connection counterparts mentioned at the outset, but also with new connection counterparts that have counter-contours with rotationally positive locking.

One or more longitudinal locking contours can be provided. The longitudinal latching contour can include, for example, a hook mount, latch mount or the like. A respective longitudinal latching contour can be partially annular, for example. It is particularly preferred if a longitudinal latching contour is ring-shaped. For example, the longitudinal latching contour can comprise a circumferential groove or an in particular circumferential annular projection.

The longitudinal locking contour can also include a rib structure.

The at least one longitudinal latching contour can be arranged on an inner circumference or an outer circumference of the plug-in section. It is also possible for at least one longitudinal latching contour to be present both on the outer circumference and on the inner circumference.

It is advantageous if the at least one longitudinal latching contour and the at least one rotationally positive locking contour are both arranged on the inner circumference or on the outer circumference.

It is also possible to have at least one longitudinal latching contour on the inner circumference of the plug-in section and the at least one rotary form-locking contour on the outer circumference, or vice versa on the inner circumference the rotary form-locking contour and on the outer circumference the longitudinal locking contour.

The at least one rotary form-fitting contour and the at least one longitudinal locking contour are preferably arranged one behind the other with respect to a plug-in axis or a plug-in direction. The arrangement can be such that, for example, the longitudinal locking contour is arranged closer to the insertion opening or the plug-on contour of the plug-in section, so that when a mating connector is plugged into the connecting piece, it first comes into contact with the longitudinal locking contour and then with the at least one rotary form-fitting contour, for example when on the Connection counterpart is a rotary form-fitting counter-contour that interacts with the rotary form-fitting contour. Appropriately, it is provided that rotary form-fitting contours are arranged on the plug-in section to produce a form-fitting connection between the connection piece and the respective connection counterpart, which engage or disengage with rotary form-fitting counter-contours of the respective connection counterpart by a relative rotary movement of the connection piece and the connection counterpart about a longitudinal axis of the plug-in section are bringable.

It is advantageously provided that the rotary form-fit contours have at least one inner rotary form-fit contour arranged on an inner circumference of the plug-in section for an outer rotary form-locking counter-contour arranged on an outer circumference of the plug-in connection counterpart and at least one external rotary form-locking contour arranged on an outer circumference of the plug-in section for a rotary form-locking contour arranged on an inner circumference of the attachment -Connection counterpart arranged internal rotary form-fitting counter-contour include. Rotational form-fitting contours are therefore provided on the plug-in section both inside and outside.

The basic idea here is that the connection piece is designed either for plugging in or plugging in a counterpart connection piece and can create a rotary form fit in both cases. Compared to a form fit exclusively in the plug-in direction, the rotary form-fit has the advantage that it can ensure a better hold in the pull direction or in the direction of the longitudinal axis of the plug-in section, which forms a plug-in axis, for example.

The rotationally positive-locking contours can include rotationally positive-locking projections and rotationally positive-locking receptacles or be provided on rotationally positive-locking projections or rotationally positive-locking receptacles.

For example, the mating connector can be screwed to the connector according to the invention. Screwing is possible in both cases, on the one hand in the sense of screwing it on, that is to say when the connecting counterpart is screwed onto the connecting piece, but also in the sense a screwing, which means that the connection counterpart is screwed into the connection piece. A plug-and-rotate movement is particularly preferred, ie the connection piece and the counterpart connection piece are plugged onto one another, so to speak, and then fixed to one another in a form-fitting manner by means of a rotary movement. That will become clear later.

The rotary form-locking contours, ie both the inner and the outer rotary form-locking contours, can include, for example, one or more circumferential rotary form-locking contours running spirally with respect to the plug-in axle. However, a circumferential rotary mold-locking contour running at right angles, for example configured as a circumferential groove, is also advantageous. Furthermore, it is advantageous if the circumferential rotary form-locking contour comprises a thread and/or at least one bayonet rotary form-locking contour or both.

In any case, it is clear from this that many variants of rotary form-fitting contours are possible, namely threads, spirals, circumferential grooves that run approximately at right angles or at an obtuse angle to the plug-in axle, hook-shaped structures or the like. Of course, a rotationally positive-locking contour of the connection piece can also include, for example, a cam or a rotationally positive-locking projection.

It is advantageously provided that a form-fitting contour, in particular rotary form-fitting contour, is provided which has at least one adjusting bevel or wedge bevel which, when the connecting piece and the connecting counterpart are rotated relative to one another, causes a displacement and/or bracing of the connecting piece and the connecting counterpart along the longitudinal axis towards one another. Advantageously, two interacting bevels are provided on the connection piece and the counterpart connection piece, one bevel or wedge bevel being sufficient.

Furthermore, it is possible that, so to speak, different rotationally positive locking contours are provided on the inside and outside of the connection piece in terms of geometric shape and/or size. Furthermore, for example, rotationally positive locking projections inside and be provided on the outside rotary form-fit recordings. It is possible, for example, for a circumferential groove, a thread or a bayonet arrangement to be provided radially on the outside, but a cam or another rotationally positive-locking contour on the inside for a mating connector to be inserted. The inner rotary form-fitting contour is, for example, one that does not include a groove running in the circumferential direction.

Advantageously, for example, in terms of compatibility, it is provided that on the outer circumference or radially on the outside of the connection piece, groove-like or grooves having rotary form-fitting contours, at least at least one groove-like rotary form-fitting contour is provided, while on the inner circumference or radially on the inside, so to speak, individual projections, cams or the like are present.

An advantageous embodiment of the invention provides, for example, that the at least one internal rotary form-fitting contour of the connecting piece according to the invention and the associated internal rotary form-fitting counter-contour of the connecting counterpart have the same contour. In terms of compatibility, it is also when the at least one outer rotary form-fitting contour and the outer rotary form-fitting counter-contour (of the connecting counterpart) have the same contour. The contour equality is preferably to be understood in such a way that the geometry and/or size of the rotary form-fitting contours are identical or at least match one another.

In the case of at least one, advantageously several, circumferential rotary form-locking contours, it is advantageous if the respective circumferential rotary form-locking contour communicates with a longitudinal guide contour running essentially parallel to the plug-in axis, so that a rotary form-locking counter-contour, for example a form-locking projection, cam or the like, can be inserted along the longitudinal guide contour into the circumferential rotary form-locking contour and, if necessary, again can be moved out. For example, the longitudinal guide contour is a guide channel or the like. For example, the longitudinal guide contour and the circumferential rotary form-locking contour form an L-shaped or hook-like arrangement. As already mentioned, the rotary form-fit counter-contour can, so to speak, along the longitudinal guide contour are moved along and then rotated so that they positively engages in the at least one peripheral rotary form-fitting contour.

However, the longitudinal guide contour can be relatively broad or wide, i.e. it enables the rotationally positive-locking counter-contour not only to be inserted or moved linearly along the longitudinal guide contour, but also to a certain extent twisted. Consequently, the rotationally positive-locking contour in the longitudinal guide contour can have play transversely to the plug-in axis or transversely to the longitudinal axis of the plug-in section, for example rotational play.

An advantageous variant provides that the longitudinal guide contour narrows in the direction of the circumferential rotary form-locking contour, ie is narrower, so that the rotary form-locking counter-contour is guided, so to speak, by the longitudinal guide contour in the direction of the circumferential rotary form-locking contour. The longitudinal guide contour can be wider in the area of its insertion opening and narrower in the area of the circumferential rotary mold locking contour. For example, the longitudinal guide contour can be funnel-shaped or conical.

The rotationally positive-locking contours can also include at least one positive-locking projection, for example a cam, a bayonet hook or the like, for screwing into a rotationally positive-locking counter-contour running in the circumferential direction about the longitudinal axis of the plug-in section. The rotary form-locking counter-contours, like the rotary form-locking contours of the connecting piece according to the invention, can include, for example, circumferential grooves running in the circumferential direction, circumferential rotary-locking counter-contours running spirally or the like.

The at least one positive-locking projection preferably forms part of the inner rotary positive-locking contours and protrudes radially inward in the direction of the flow channel in front of a peripheral wall of the plug-in section.

At least one latching contour is preferably provided, which is caused by the relative rotary movement of the connection piece and the connection counterpart around the longitudinal axis of the plug-in section and/or a sliding movement or longitudinal movement, for example, parallel or substantially parallel to the longitudinal axis of the plug-in section or also obliquely to this longitudinal axis, can be brought into or out of snap-in engagement with a snap-in counter-contour of the mating connector piece. In this case, there is not only a rotary form fit, but also a latching. The rotationally positive connection is therefore additionally secured by a latch. In particular, this is a rotary catch, rotary lock or the like. For example, the latching contour includes a latching lug, a latching recess or the like. According to the invention, a longitudinal latch, which can be brought into engagement or disengagement relative to one another by a sliding movement of the connection piece and the counterpart connection piece, forms an additional safety measure.

The latching contour can be spring-loaded, for example, by a spring or a spring element, for example a helical spring. According to the invention it is provided that the at least one latching contour consists of an elastic material to achieve a spring effect and/or is arranged on an elastic section of the connecting piece. The latching counter-contour can also be a latching hook or latching cam, for example.

A further embodiment of the invention provides for the rotary form fit to be secured by a lock, for example by means of a locking element or the like which is displaceably mounted on the connection piece or connection counterpart. The locking element can engage in the latching contour of the connection piece in order to establish the lock.

The at least one latching contour expediently comprises a latching receptacle running transversely to the relative rotary movement or a latching projection, for example a rib, running transversely to the relative rotary movement.

The latching contour of the connection piece preferably extends approximately parallel to the longitudinal axis or to the plug-in axis of the plug-in section.

The latching contour and the mating latching contour can produce a latching, ie a longitudinal latching or a rotary latching, in particular when the connecting piece and the connecting counterpart have reached their final rotary position. However, it is also possible for the latching, in particular the rotary latching, to represent only additional security, so to speak, but still allow a relative rotary movement of the connection piece and the counterpart connection piece. Then the connection piece and the connection counterpart still have a rotational play about the longitudinal axis of the plug-in section or the plug-in axis of the plug-in section, although they are locked together.

A particularly preferred embodiment of the invention provides that at least the latching contour, for example the rib or the receptacle, is arranged between the already mentioned longitudinal guide contour and the peripheral rotary mold locking contour. For example, the at least one latching contour extends approximately in an axial extension, parallel to the plug-in axis or to the longitudinal axis of the plug-in section, to a side wall of the longitudinal guide contour. It is possible for the at least one latching contour to represent a rib or a groove, so to speak, between the longitudinal guide contour and the circumferential rotary form-locking contour.

An embodiment of the invention can provide that the plug-in section and the tubular body carrying the plug-in section consist of an identical or similar material. It is possible for the plug-in section and the tubular body carrying this plug-in section to consist, for example, of the same plastic and/or to have the same hardness and/or elasticity.

A preferred exemplary embodiment provides that the plug-in section is relatively soft, or in any case consists of a softer material than the plug-in section load-bearing tubular body. The plug-in section can also have a softer material than the tubular body carrying it, ie not consist of the softer material as a whole. It is therefore possible for the plug-in section to consist of the softer material as a whole or to be designed as a multi-component part, ie for example to have sections or components made of a harder material and sections or components made of a softer material. The harder material is preferably the same as the tubular body.

It is preferred if there is a certain elasticity that improves the retention of the form fit. For example, it is provided that the rotary form-fitting contours and/or the latching contour are elastically flexible.

For example, it is advantageous if at least one of the rotationally positive-locking contours and/or a latching contour is elastically flexible or is arranged on the elastically flexible material.

An advantageous variant of the invention can provide that a rotary form-fitting contour, a locking contour or the like is relatively hard and the adjacent material is relatively soft. For example, such a variant provides that the at least one rotary form-fitting contour or latching contour consists of a harder or less elastic material than the plug-in section base body of the plug-in section that carries the rotary form-fitting contour or latching contour. Thus, the rotationally positive locking or the latching can be ensured using the relatively hard and thus wear-resistant material of the rotationally positive locking contour or the locking contour. The connection is precise and dimensionally accurate. On the other hand, the plug-in section basic body yields somewhat, so that the contours of the connecting piece and connecting counterpart that interact in a form-fitting manner, namely the rotationally positive-locking contours and the rotationally positive-locking counter-contours and/or the locking contour and the associated counter-locking contour, can optimally contact one another.

It is also advantageous if a form-fitting contour, for example a rotational form-fitting contour, plug-in form-fitting contour or latching contour, consists of a one relatively low-friction and/or hard material, so that the respective form-fitting contour can easily slide along the form-fitting counter-contour. It is possible that defined sliding surfaces are provided, ie sections that can easily slide along each other. A form-fitting surface is then expediently located next to the sliding surface, but this has higher friction, for example because an elastic or softer material is provided there.

An advantageous variant of the invention provides that at least one form-fitting contour, for example the at least one rotary form-fitting contour or the latching contour or both, is provided on a form-fitting body, for example a cam or other form-fitting projection, a receptacle, for example a groove or the like. A recess, for example a groove, notch or the like, which is suitable for deforming the form-fitting body, is expediently provided on the respective form-fitting body. When the form-fitting body is brought into engagement with the associated counter-contour or is disengaged, the recess allows the form-fitting body to be deformed or yielded, so that, for example, the rotary form-fitting contour or latching contour can move away from the associated counter-contour, namely the respective rotary form-fitting counter-contour or latching counter-contour . The recess can be completely free, filled with air, so to speak, which enables a particularly high degree of mobility. However, it is also possible for the form-fitting body to consist of a relatively hard material and for the recess to be filled, as it were, with softer material, for example of the plug-in section base body carrying the form-fitting body.

It is advantageously provided that the plug-in section consists of an elastically more flexible material than the tubular body. At least one rotary form-fitting contour is arranged on the soft plug-in section. It is a basic idea that the rotary form-fitting contours arranged on the relatively soft plug-in section ensure an improved hold of the mating connector.

It is a basic idea that the rotary form-fitting contours or at least one rotary form-fitting contour arranged on the relatively soft plug-in section ensure an improved hold of the mating connector.

The plug-in section yields elastically, for example, so that it can be plugged onto the mating connector piece, for example. The plug-in section plugged onto the mating connector clamps the mating connector, so to speak, so that twisting is hindered or made more difficult. The rotationally positive-locking contours and rotationally positive-locking counter-contours thus remain optimally engaged, so that the connection piece and the connection counterpart hold together well. This principle works in the same way when the plug-in section is plugged into a plug-in receptacle of the mating connector and is somewhat compressed as a result. The male portion tends to expand, making it relatively difficult to twist in the female connector. As a result, the rotary form-fitting contours and rotary form-fitting counter-contours remain optimally engaged.

A further aspect is that a relatively soft material, from which the plug-in section is made or which the plug-in section has, generally has higher friction than a hard material. The friction also counteracts an unintentional loosening of the rotary form fit.

The rotationally positive-locking contours can include rotationally positive-locking projections and rotationally positive-locking receptacles or be provided on rotationally positive-locking projections or rotationally positive-locking receptacles.

In the connection piece according to the invention, rotationally positive-locking contours can be provided on the inner circumference of the plug-in section or on the outer circumference of the plug-in section. A variant is preferred in which rotary form-fitting contours are arranged both on the inside and on the outside. It is therefore advantageous if it is provided that the at least one rotary form-fitting contour has at least one inner rotary form-fitting contour arranged on an inner circumference of the plug-in section for one on an outer circumference of the plug-in connection counterpart arranged outer rotary form-fitting counter-contour and at least one arranged on an outer circumference of the plug-in section external rotary form-fitting contour for arranged on an inner circumference of the plug-connector counterpart inner rotary form-fitting counter-contour.

It is advantageously provided that the connecting piece has a pipe section constructed as a multi-component section and having a longitudinal axis, with at least one stiffening element having a longitudinal shape made of a material that is harder and/or more tensile than the base material being inserted as a second component into a base material of the pipe section that forms a first component and/or stiffening material which is more resistant to bending and/or has a higher rigidity is embedded. The tube section can, for example, form the plug-in section or another section of the connecting piece. Form-fitting elements, for example for a longitudinal form-fitting or a rotary form-fitting, can be provided on the pipe section.

The basic idea here is that the base material is, so to speak, basically somewhat more flexible than the stiffening material, so that, for example, compression or expansion is possible when plugging in or plugging onto the mating connector. At the same time, the stiffening material having a longitudinal shape, for example having strip-shaped stiffening elements, ensures that the pipe section cannot be bent as much with respect to its longitudinal direction. The tube section is thus, for example, more resistant to bending than another section of the suction hose connection piece, so that it is less prone to kinking. This makes it easier, for example, to plug the connection piece and the counterpart connection piece together.

It goes without saying that even a single stiffening element acts in the sense of the invention, ie reduces the tendency of the pipe section to buckle. However, it is preferred if several stiffening elements are provided. The following explanations therefore relate to a connection piece in which several stiffening elements are generally provided. When it comes to the geometric configurations of a respective stiffening element, these are of course also readily possible with a single stiffening element.

The at least one stiffening element is expediently parallel to a longitudinal axis of the at least one pipe section. However, they can also have an angle to the longitudinal axis, in particular an angle of less than 90°, in particular less than 45°. A relatively small inclination of the stiffening elements to the longitudinal axis of the tube section, for example of about 5-20°, is particularly preferred. The stiffening elements can thus optimally stiffen the pipe section transversely to the longitudinal axis.

For example, the at least one stiffening element extends in the direction of a plug-in axis, along which the connection piece can be attached to the connection counterpart. The at least one stiffening element counteracts kinking of the pipe section.

It is also possible for at least one stiffening element and/or at least part of the stiffening elements to extend in the circumferential direction of the pipe section. The at least one stiffening element has or the stiffening elements have, for example, an annular or circular or arc-shaped course and/or are arranged in a circular or arc-shaped manner. The stiffening acts, for example, in such a way that the tube section cannot be compressed as easily.

It is also possible for the stiffening elements to be embedded chaotically or unevenly in the base material of the connecting piece. For example, it is possible for the stiffening elements to comprise fibers or be formed thereby.

Expediently, it can also be provided that the at least one stiffening element is not designed as a knitted fabric. It is therefore expedient if the stiffening elements have a directional structure, which means that, for example in the case of a fiber structure, the stiffening elements are essentially run parallel to one another, in particular aligned in the direction of the longitudinal axis.

It can advantageously be provided that the at least one stiffening element has a larger cross section than a glass fiber or textile fiber. The at least one stiffening element can be relatively solid, ie not designed as a thin fiber. Nevertheless, the stiffening element can, for example, be designed in the form of a lamella or have lamellae.

It is advantageously provided that the at least one stiffening element is not designed as a whole as a sleeve. This measure can contribute to the fact that the stiffening element is flexible transversely to the longitudinal axis.

It is advantageous if the at least one stiffening element is not made of metal. It is advantageous if the at least one stiffening element consists of plastic or a plastic material.

A number of measures are proposed below which facilitate the deformability of the tube section transversely to the longitudinal axis.

The stiffening elements are expediently spaced transversely across the longitudinal axis or in a circumferential direction about the longitudinal axis. As a result, the base material of the pipe section can deform elastically transversely to the longitudinal axis, with the stiffening elements offering little or no resistance to this.

The stiffening elements are expediently spaced transversely from one another in the circumferential direction, i.e. around the longitudinal axis.

The distances between the stiffening elements contribute to or enable the circumference of the pipe section to be expanded or compressed easily, which facilitates or in some cases even enables plugging or plugging onto or into the mating connector.

The at least one stiffening element or several stiffening elements are preferably strip-shaped. A respective stiffening element thus forms a stiffening strip, for example. The stiffening elements are preferably laminar. The stiffening elements can be designed, for example, in the manner of stiffening lamellae. It is preferred if a respective stiffening element is sheet-like.

It is expedient if the at least one stiffening element has a curvature and/or an angular contour transversely to its longitudinal direction or transversely to its direction of longitudinal extent. The curvature or longitudinal contour can only be provided on at least one longitudinal section, ie not over the entire length, of the stiffening element. As a result, the stiffening element has a higher mechanical load-bearing capacity and/or is stiffer. For example, the stiffening element is ring-shaped or circular in cross-section. The at least one stiffening element has, for example, an arcuate cross section or an arcuate contour on its inner radius and/or on its outer radius. However, the stiffening element can also have two or more limbs at an angle to one another in cross section. The at least one stiffening element can have at least one angle in cross section or can also be polygonal. The at least one stiffening element expediently has a non-planar contour transverse to its longitudinal direction and/or in cross section.

A preferred embodiment of the invention provides that several stiffening elements are arranged next to one another in the manner of segments of a circle. There is an arcuate distance or angular distance between the stiffening elements.

It goes without saying that a combination of stiffening fibers and lamellar or strip-like stiffening elements is easily possible.

It is preferred if the stiffening elements extend along the entire circumference of the pipe section, ie the pipe section has stiffening elements, so to speak, all over its circumference.

The stiffening elements can form a kind of cage structure around the longitudinal axis of the pipe section.

The stiffening elements have, for example, a different transverse width in relation to their longitudinal direction. For example, they are somewhat narrower in the area of their free longitudinal ends than at another longitudinal end area or in the area between their longitudinal ends, for example in the area of their longitudinal center.

The tube section with the stiffening elements can, for example, form the plug-in section of the connecting piece. The plug-in section, which is reinforced by the stiffening elements, can be plugged onto the mating connector piece in a particularly favorable manner. The plug connection is stable and resilient. Compared to such a plug-in section, which has no stiffening elements, the plug-in section has a significantly higher buckling resistance.

The stiffening elements or at least some of them, for example two or more, are expediently connected to one another in the circumferential direction of the tube section by a connecting section. The connecting section can be formed, for example, by a circular segment-like or ring-shaped connecting body. It is particularly preferred if the tubular body forms such a connecting section. For example, it is possible for at least one stiffening element to protrude from the tubular body into the tubular section reinforced by the stiffening structure or the stiffening elements. For example, the stiffening elements protrude like fingers from the tubular body or other connecting section and are embedded in the base material of the tubular section that they stiffen. It can also be provided that the tubular body is provided as a connecting section and an additional connecting section, separate from the tubular body, for connecting stiffening elements.

It is preferred if the at least one stiffening element is integral or in one piece with the tubular body.

It is preferred if the material of the tubular body forms the material of the at least one stiffening element, ie the stiffening material. This variant of the invention is, for example, readily possible if the at least one stiffening element, preferably a plurality of stiffening elements, protrudes from the tubular body in the direction of the tubular section reinforced by the stiffening structure. However, it is also possible for a specific material, for example plastic, to be used in an injection molding or casting process to produce at least one stiffening element and a tubular body separate from it, which are connected to one another in a second production step by the base material of the tubular section.

It is preferred if the stiffening material and/or the at least one stiffening element is partially or completely encased or covered by the base material of the pipe section. Thus, for example, a relatively soft base material and/or an elastic base material that has a high coefficient of friction and/or an elastic base material can partially or completely surround the stiffening material or the at least one stiffening element. It is preferred if the stiffening element is covered or encased radially on the outside and/or radially on the inside with the base material, in particular in the contact area for contact with the mating connector.

An inner component and an outer component of the base material of the pipe section are expediently molded onto the at least one stiffening element or the stiffening material of the pipe section in separate work steps, for example sprayed or cast on. It should only be mentioned in passing that the base material is homogeneous in a preferred embodiment of the invention, ie it comprises a single material. However, it is also possible to use different materials as the base material, for example plastics of different elasticity. For example, in the above-mentioned configuration with an inner component and an outer component, it is easily possible to use a different base material for the inner component than for the outer component.

The base material of the advantageously stiffened tube section can therefore comprise a first and a second base material.

The plug-in section and/or the tube section expediently has at least one section of the flow channel.

Form-fitting contours, for example form-fitting receptacles or form-fitting projections, can be provided on the advantageously stiffened pipe section. These can be formed from softer and/or harder material, for example from base material and/or from stiffening material. The form-fitting contours can include, for example, rotary form-fitting contours, longitudinal locking contours or the like. The rotationally positive-locking contours can include rotationally positive-locking projections and rotationally positive-locking receptacles or be provided on rotationally positive-locking projections or rotationally positive-locking receptacles.

A form-fitting contour can also be provided on a stiffening element. The form-fitting contour is suitable, for example, as a rotary form-fitting contour, latching contour, in particular longitudinal latching contour or the like, in order to provide a form-fitting hold of the mating connector. The form-fitting contour thus interacts with a form-fitting counter-contour of the connection counterpart when the connection piece is connected to the connection counterpart.

The form-fitting contour protrudes, for example, in front of the base material, completely or only in sections. For example, a type of cam or hump or another form-fitting projection can be provided on the stiffening element, which protrudes radially outwards or radially inwards in front of the base material of the pipe section. Of course, a form-fitting receptacle on the at least one stiffening element is also possible. It is also possible for the form-fitting contour to be encased at least in sections by the base material. The base material is relatively soft, so it can, for example, have higher friction than the stiffening material, which means that the form fit of the Form-fitting contour with the form-fitting counter-contour is better ensured by correspondingly higher friction.

An advantageous measure provides for the at least one stiffening element to protrude in front of the base material with at least one section, for example the aforementioned form-fitting contour or also on another surface, so that a sliding surface or electrically conductive surface is formed.

The connection piece according to the invention is preferably made of plastic. However, metallic components are also possible. Metal is particularly suitable for better conductivity, for example for dissipating electrostatic charges.

A preferred, relatively hard material from which, for example, a so-called hard component, in particular the tubular body and/or at least one of the stiffening elements consist entirely or essentially, is expediently polypropylene or a polyamide. The harder material may also include a thermoplastic elastomer (TPE). Although these materials can also be used for the softer material, they then have a lower strength or hardness. Depending on the crosslinking of the thermoplastic elastomer and/or the composition of the components of the elastomer, the hard property can be adjusted, so to speak. The thermoplastic elastomer is, for example, a so-called copolymer and consists of a "soft" elastomer and a "hard" thermoplastic component, the proportions of which are selected according to the Shore hardness desired in each case.

For example, the harder or stiffer material is 1.5 times or two to three times stiffer than the softer material. Alternatively, the stiffer material can be four or five times stiffer than the softer material. This also applies if both materials basically have the same chemical basis, so to speak, for example TPE plastics are of a similar design, for example TPE-U or TPU (thermoplastic elastomers based on urethane) or TPE-S or TPS = styrene block copolymers (SBS, SEBS, SEPS, SEEPS and MBS).

The softer or more elastic material from which, for example, the plug-in section base body, in particular its inner component and/or outer component, is made, in particular its inner component and/or outer component, is preferably an elastomer, in particular a thermoplastic elastomer. The elastomer is, for example, a vulcanizate of natural rubber and silicone rubber. It goes without saying that the softer material can also comprise or be formed by caoutchouc, rubber or the like.

The plug-in section base body of the plug-in section, in particular its inner component, preferably consists of a softer or more elastic material than the tubular body. The relatively soft, elastic plug-in section ensures a tight fit and a high degree of tightness on the plug-in section of the counterpart connection. In addition, the plug-in section has a certain tolerance, i.e. it adapts somewhat to the geometry of the associated mating plug-in section of the mating connector due to its elasticity or softness.

The different materials explained can advantageously be provided for different purposes, for example harder materials for form-fitting contours and softer materials in order to provide their flexibility. The softer or more elastic base material can also be used to make a section of the connector flexible, for example for the purpose of compression when plugged into a plug-in receptacle of the connector counterpart or an opportunity for expansion when plugged onto a plug-in section of the connector counterpart. Harder and/or more tensile and/or bending-resistant materials adjoining it in the direction of a longitudinal axis of this softer section or preferably embedded in the softer section serve, for example, to stiffen this softer section or also to connect the suction hose, for example. A relatively hard tubular body is suitable, for example, for receiving a holder for the suction hose so that it can rotate but is tension-resistant.

It is also advantageous if relatively hard materials are also embedded in a softer material, so to speak, or are at least partially covered or encased by softer material. The softer material has, for example, higher friction than a harder material, as a result of which a frictional connection or the hold of the connection piece and the counterpart connection piece is improved. It is possible, for example, for a form-fitting body, which forms a latching contour, form-fitting contour, in particular rotary form-fitting contour or the like, to be produced with a coating made of a softer material.

It is also within the scope of the invention if a form-fitting body is in one piece or homogeneous with the base body on which it is arranged, for example the plug-in section base body or the like.

Furthermore, materials of different hardness and/or different tensile strength and/or different elasticity are suitable for producing the connection piece as a whole or in sections as a multi-component part or for forming a connection piece with a multi-component section.

The different materials of the connection piece are characterized by the following properties, for example. A harder component or a harder material has, for example, a hardness of 20-100 Shore D or 30-100 Shore D. However, the harder component can also be somewhat softer overall, for example 20-70 Shore D, 30-70 Shore D or 30- have 60 Shore D. In the case of the soft component or the softer material, it is advantageous if it has a Shore A hardness of 40-100, particularly preferably 50-90 Shore A. A hardness of 60-80 Shore A is also easily possible.

With regard to the elasticity, the one, for example, harder component or the one, for example, harder material has a modulus of elasticity of, for example, 80-2500 N/mm ² , in particular 1000 to 1800 N/mm ² . The softer or more elastic material, on the other hand, is characterized by a modulus of elasticity of at most 800 N/mm ² , expediently at most 700 N/mm ² , particularly preferably at most 600 N/mm ² .

With regard to the elongation at break or elongation at break, it is advantageous if the softer component or the softer material has an elongation at break or elongation at break of at least 70%, particularly preferably at least 80% or even at least 100%. In the case of harder or less tear-resistant material, an elongation at break or elongation at break of greater than 5% or 10%, expediently greater than 30%, but also greater than 40% or 50% is advantageous.

A stiffness of the harder or stiffer material is expediently 1.5 times or two to three times the stiffness of the softer or less stiff material. The stiffening elements explained preferably have such a higher stiffness than the basic material of the pipe section even if the base material and the stiffening material are chemically similar or, so to speak, have the same chemical basis (for example TPE, in particular TPE-S or TPE-U/TPU). or plug-in section.

Furthermore, electrically conductive materials, in particular electrically differently conductive materials, are advantageously provided. Electrically conductive materials are suitable, for example, for dissipating electrostatic charges. Thus, a softer and/or a harder material of the connection piece according to the invention can be electrically conductive. It is also possible that the connection piece as a whole or parts thereof are not electrically conductive.

In the case of materials with different electrical conductivity, for example, the more elastic or softer material can be less electrically conductive than the harder material, or vice versa. In any case, it is advantageous if the second, electrically conductive material protrudes at least there in front of the first, electrically less conductive material, for example the elastic material, where an electrical contact or an electrical connection with the mating connector is necessary or advantageous. It is therefore an advantageous variant of the invention if the connection piece has a first, electrically less conductive material than a second material, the second material protruding at least in sections in front of the first material for establishing an electrical connection with the connection counterpart or in front of the first material is arranged.

The connecting piece according to the invention can have a holder for a suction hose, for example. The holder can be provided integrally on the tubular body, for example having corresponding receiving ribs for a reinforcing spiral of a suction hose. However, the holder on the tubular body is preferably provided as a separate component, for example rotatably accommodated on the tubular body, but fixed to the tubular body with high tensile strength. It is also possible for the holder to be fixed in place on the tubular body, that is to say immobile or with a small amount of play.

The connection piece according to the invention and the connection counterpart expediently form a system of connection piece and connection counterpart. All of the above and following configurations of the connection piece naturally also apply to the connection counterpart. Like the connecting piece, the mating connector can form an integral part of a hand-held power tool or a vacuum cleaner or a suction hose.

Configurations explained in the exemplary embodiments relating to the connection piece are also easily possible with a connection counterpart. The respective connection pieces or connection counterparts can also form components of machine tools or suction devices. Furthermore, a connection piece according to the invention can have, for example, two or more plug-in sections. For example, two plug-in sections can be provided on opposite sides of the tubular body. Furthermore, at least two plug-in sections can be arranged on one and the same side, which are suitable for different plug-in diameters of the counterpart connection. Such plug-in sections can, for example, be nested coaxially within one another.

The connecting piece expediently has a holder for a suction hose. The mount has, for example, clamping contours or holding contours or form-fitting contours for the suction hose. In particular, screw contours or other contours are provided on the holder for fastening the suction hose, in particular for fastening it in a tensile and/or non-rotatable manner.

The bracket is expediently provided on the tubular body. With regard to the tubular body or another component of the connection piece, the holder is arranged, for example, in a rotationally fixed and/or non-slip and/or fixed manner. The holder can also form an integral part of the connection piece, for example it can be designed in one piece with the tubular body. The holder can be rotated relative to the plug-in section. The holder is expediently non-displaceable with respect to the plug-in section along the longitudinal axis. It is also possible for the holder to be mounted on the tubular body or on another section of the connecting piece so that it cannot be displaced with respect to the longitudinal axis, but is nevertheless rotatable.

At least one form-fitting body of the connecting piece, with which a rotary form-fitting contour, a longitudinal locking contour or the like is formed, for example, has a base material that is covered, in particular encased, at least in sections in the area of the form-fitting contour with a material that is softer or more elastic than the base material. Furthermore, it is advantageous if this other material has a higher coefficient of friction than the base material. Thus, in any case, the form fit is improved with a counter form fit contour interacting with the form fit contour.

The connection piece according to the invention can also form part of a hand-held power tool. In this case, a handheld power tool is also understood to be a power tool that is portable, for example, such as a chop saw. Use is preferred, for example, in hand-held circular saws, milling machines or the like. The rotary form-fitting contours ensure a particularly firm and reliable hold. The connecting piece can be fixed to the hand-held power tool, but it can also be designed to be removable.

The connecting piece can comprise a plurality of components arranged one behind the other in the direction of a row, for example the plug-in section and a one-part or multi-part tubular body. The multi-part tubular body can be designed, for example, so that it has two relative to each other rotatable and / or has sliding tubular body sections. It is also possible for the tubular body to be divisible, for example to have sections that can be screwed, latched, latched or otherwise releasably connected to one another.

The connection piece can also be a separate connection piece, for example designed as an adapter, with which, for example, two hose sections of the suction hose can be connected to one another.

The connecting piece according to the invention can, for example, be round in cross section. However, it is also possible for the connecting piece to have a polygonal cross section. For example, it is conceivable that the connection piece, even with a polygonal cross section, for example with at least 8 or 12 corners, i.e. relatively flat-angled corner areas, still remains twistable, so that it can be twisted relative to the connection counterpart and the elastic areas give way, so to speak, during the rotary movement.

A plug-in section of a connection piece according to the invention can be used for plugging in or attaching the counterpart connection piece along the longitudinal axis of the plug-in section, so to speak the plug-in axis. It is also possible for a rotary movement to be superimposed on this plug-in movement, so that in principle the connecting piece and the connecting counterpart are moved relative to one another along the longitudinal axis of the plug-in section, but at the same time are rotated relative to one another when the connection between the connecting piece and the connecting counterpart is established. Sequential connection is also possible, which means that the connection piece and the connection counterpart are twisted relative to one another in a sequential movement and are attached to one another or detached from one another along the longitudinal axis or plug-in axis.

Figur 1

eine Seitenansicht eines Anschlussstücks mit einem teilweise dargestellten Saugschlauch,

Figur 2

eine Querschnittsansicht durch das Anschlussstück gemäß Figur 1 entlang einer Schnittlinie A-A in Figur 1,

Figur 3

eine Explosionsdarstellung einer Variante des Anschlussstücks gemäß Figur 1, von dem in

Figur 4

ein Steckabschnitt dargestellt ist,

Figur 5

eine Seitenansicht einer Variante des Anschlussstücks gemäß Figur 2, auf das in der Darstellung gemäß

Figur 6

ein Anschlussgegenstück aufgesteckt ist (Querschnittsdarstellung entlang einer Schnittlinie B-B in Figur 5) und in das in der Darstellung gemäß

Figur 7

ein Anschlussgegenstück eingesteckt ist (Querschnittsdarstellung entlang einer Schnittlinie C-C in Figur 5),

Figur 8

eine Anordnung mit dem Anschlussstück gemäß Figur 5 in Kombination mit mehreren, unterschiedlichen Anschlussgegenstücken, die mit dem Anschlussstück verbindbar und kompatibel sind,

Figur 9

einen Staubsauger mit einem Saugschlauch, an dessen freiem Ende ein Anschlussstück in der Art beispielsweise des Anschlussstücks gemäß Figur 5 angeordnet ist,

Figur 10

eine vergrößerte Detaildarstellung von Figur 9 von der Seite her,

Figur 11

ein vorderes Ende des Saugschlauchs des Staubsaugers gemäß Figuren 9, 10, wobei ein Anschlussgegenstück auf das Anschlussstück aufgesteckt ist,

Figur 12

eine Variante des Staubsaugers gemäß Figur 9, wobei dieser mit einem erfindungsgemäßen Anschlussstück, z.B. in der Art gemäß Figur 5, ausgerüstet ist,

Figur 13

eine Seitenansicht einer Hand-Werkzeugmaschine in Gestalt einer Schleifmaschine, deren Saugschlauch-Anschluss ein Anschlussgegenstück bildet, auf das ein Anschlussstück gemäß beispielsweise Figur 7 aufgesteckt ist,

Figur 14

eine Ansicht von hinten auf eine Variante der Hand-Werkzeugmaschine gemäß Figur 13, wobei diese alternativ mit einem Anschlussstück gemäß der Erfindung ausgerüstet ist, z.B. in der Art des Anschlussstücks gemäß Figur 19 oder Figur 5 oder 8,

Figur 15

eine weitere Hand-Werkzeugmaschine in Gestalt einer Sägemaschine, an die ein Saugschlauch mit einem erfindungsgemäßen Anschlussstück angeschlossen ist,

Figur 16

den Saugschlauch-Anschluss, also das Anschlussgegenstück, der Hand-Werkzeugmaschine gemäß Figur 15,

Figur 17

eine erfindungsgemäß ausgestaltete erste Variante des Saugschlauch-Anschlusses der Hand-Werkzeugmaschine, wobei dieser ein erstes Anschlussstück gemäß der Erfindung aufweist,

Figur 18

eine erfindungsgemäß ausgestaltete zweite Variante des Saugschlauch-Anschlusses der Hand-Werkzeugmaschine mit einem zweiten Anschlussstück, etwa entsprechend dem Anschlussstück gemäß Figur 5 oder 8,

Figur 19

die Anordnung gemäß Figur 18 mit angeschlossenem Saugschlauch.

Exemplary embodiments of the invention are explained below with reference to the drawing. Show it:

figure 1

a side view of a connector with a partially shown suction hose,

figure 2

a cross-sectional view through the fitting according to FIG figure 1 along a cutting line AA in figure 1 ,

figure 3

an exploded view of a variant of the connector according to figure 1 , from which in

figure 4

a plug-in section is shown,

figure 5

a side view of a variant of the connector according to FIG figure 2 , to which according to the representation

figure 6

a mating connector is attached (cross-sectional view along section line BB in figure 5 ) and into that in the representation according to

figure 7

a mating connector is plugged in (cross-sectional view along a section line CC in figure 5 ),

figure 8

an arrangement with the connector according to figure 5 in combination with several different connector counterparts that can be connected and are compatible with the connector,

figure 9

a vacuum cleaner with a suction hose, at the free end of which there is a connector of the type, for example, according to the connector figure 5 is arranged

figure 10

an enlarged detail view of figure 9 from the side

figure 11

according to a front end of the suction hose of the vacuum cleaner Figures 9, 10 , whereby a counterpart connector is plugged onto the connector piece,

figure 12

a variant of the vacuum cleaner according to figure 9 , This with a connector according to the invention, for example in accordance with the type figure 5 , is equipped

figure 13

a side view of a hand-held power tool in the form of a grinding machine, the suction hose connection forms a connection counterpart to which a connection piece according to, for example figure 7 is attached,

figure 14

according to a rear view of a variant of the hand-held machine tool figure 13 , which is alternatively equipped with a fitting according to the invention, for example of the type of fitting according to FIG figure 19 or figure 5 or 8th ,

figure 15

another hand-held power tool in the form of a sawing machine to which a suction hose is connected with a connector according to the invention,

figure 16

the suction hose connection, i.e. the connection counterpart, according to the hand tool machine figure 15 ,

figure 17

a first variant of the suction hose connection of the hand-held power tool designed according to the invention, this having a first connection piece according to the invention,

figure 18

an inventively designed second variant of the suction hose connection of the hand-held power tool with a second connection piece, approximately corresponding to the connection piece according to FIG figure 5 or 8th ,

figure 19

the arrangement according to figure 18 with attached suction hose.

A few exemplary embodiments of the invention are explained below, some of which have the same or similar parts or components are. In this case, where possible, the same reference numbers are used. Furthermore, features of the connection piece explained below are also advantageous for the connection counterparts that fit this connection piece. The connection counterparts expediently form system components of a system made up of connection piece and connection counterpart. Furthermore, some connection counterparts are also according to the invention if they have, for example, radially inside and radially outside rotary form-fitting contours.

A connection piece 10 for a suction hose 100 has a tubular body 11, for example. The tubular body 11 is adjoined by a plug-in section 50 which is used to plug in a mating connector 200 accordingly figure 6 or to plug in a connector counterpart 380 as in figure 7 shown is suitable.

The tubular body 11 includes a peripheral wall 12 which delimits a receptacle 19 . A holder 40 for the suction hose 100 is inserted into the receptacle 19 . The holder 40, which comprises a tubular holding body 41, for example, is preferably accommodated in the receptacle 19 in a rotatable manner. A peripheral wall 43a of the holder 40 rests, for example, on the inside 14 of the peripheral wall 12 of the tubular body 11 in a rotatable manner. Inside, the holding body 41 has a holding structure 43 for holding the suction hose 100, for example a rib structure or a thread, into which the suction hose 100 can be screwed with its reinforcement ribs, not shown, in particular spirally. A front, free end face 42 of the holding body 41 or the holder 40 rests against a bottom 15 of the tubular body 11 at the end face.

The holder 40 is fixed to the tubular body 12 by a holding element 45 . For example, a support flange or a holding projection 47 is supported on a front, free end face or narrow side 16 of the tubular body 11 . For example, a support surface 48 of the holding projection 47 is in contact with the free end face 16 . A front, free end face 46 of the holding element 45 supports an end face 44 of the holder 40, so that the holder 40 between the holding element on the one hand 45 and on the other hand the bottom 15 of the receptacle 19 is held sandwiched and/or non-slip.

To hold the holding element 45 captive during use, latching projections or holding projections 49 are provided, which protrude radially outwards in front of the holding element 45 or its base body or holding body and engage in latching receptacles or retaining receptacles 13 of the tubular body 12 . Preferably, the retaining projections 49 are resilient or designed in the manner of latches, so that they can be pushed inward in the direction of the receptacle 19 in order to release the retaining element 45 from the tubular body 12 .

It goes without saying that in an embodiment that is not shown, the tubular body 11 can integrally enclose the holding structure 43, and can therefore receive and hold the suction hose 100 directly.

The tubular body 11 and/or the holding element 45 and/or the holder 40 are preferably made of a relatively hard plastic material, for example polypropylene. As a result, the strength required to hold the suction hose 100 is readily ensured. However, it is also possible that, for example, the holding element 45 and the tubular body 11 are made of a harder material than the holder 40 for the suction hose 100. In any case, the connecting piece 11 is harder in the area of the tubular body 11 than in the area of the plug-in section 50, the base material of which is a Plastic with a lower hardness and in particular a higher flexibility or elasticity. For example, the base material of the plug-in section 50 is a thermoplastic elastomer.

Nevertheless, the plug-in section 50 also has a relatively high flexural strength, at least a higher flexural strength than would be the case if only thermoplastic elastomer were used. A stiffening structure 20 with a plurality of stiffening elements 21 is provided for stiffening. The material of the stiffening elements 21 is harder and/or more tensile and/or flexural and/or stiffer than the base material of the plug-in section 50. The material of the stiffening elements 21 is preferably at least 1.5 times, preferably 2 to three times or even four times harder or stiffer than that of the base material of the section of the connection piece stiffened by the stiffening elements 21, for example the plug-in section 50.

The plug-in section 50 forms a tube section 35. The plug-in section 50 is suitable for plugging in or plugging in a complementary mating plug-in section and is elastically flexible on the one hand, in order to enable an optimal form fit and optimal tightness with the mating connector piece, and on the other hand transverse to the longitudinal axis L or Thru axle relatively stiff. It should only be mentioned in passing that the tubular body 11 can of course also be designed in the manner of the plug-in section 50 or tubular section 35, although this is not shown in the drawing, ie stiffening elements can consist of a relatively soft material, for example.

The base material of the plug-in section 50 forms an inner component 52 and an outer component 51, which advantageously completely encases the stiffening elements 21, which are in the form of strips. The stiffening elements 21 protrude in the manner of strips or lamellae from the tubular body 12 forming a connecting section 25 or connecting body of the stiffening elements 21 in the direction of the plug-in section 50 . A circumferential spacing 24 is provided between the stiffening elements 21, so that the stiffening elements 21 are spaced apart in the circumferential direction. The stiffening elements 21 can therefore move closer to one another or be spread apart in the circumferential direction, so that a cross section of the plug-in section 50 can be reduced or enlarged when the plug-in section 50 is plugged onto a respective mating connector 300 or is plugged into a mating connector 200.

The mobility or elasticity of the plug-in section 50 is additionally improved in that the free end regions 23 of the stiffening elements 21 are narrower than their foot regions or other longitudinal end regions 22 which are connected to the tubular body 12 . As already mentioned, the tubular body 12 forms a connecting body for the stiffening elements 21, so that they are connected to one another at one longitudinal end, at their free longitudinal end regions 23 in the Sense of an enlargement or reduction of the cross section of the plug-in portion 50 toward or away from each other are movable.

The stiffening elements 21 are round in cross section, the radius approximately corresponding to the radius of the tubular body 11 . The contour of the stiffening elements 21, which is not flat in cross-section, i.e. rounded or angled, has the effect of stiffening.

The stiffening elements 21 and the tubular body 11 consist, for example, of polypropylene, at least one of the relatively hard materials mentioned at the outset. The inner component 51 and the outer component 52, on the other hand, are softer and more elastic, for example made of rubber or an elastomer, in particular a thermoplastic elastomer.

The inner component 52 and the outer component 51 of the plug-in section 50 integrally accommodate the stiffening structure 22, that is to say the stiffening elements 21 are sandwiched between the inner component 52 and the outer component 51, so to speak. The inner component 52 and the outer component 51 are expediently sequentially molded onto the stiffening structure 20 and consequently onto the tubular body 11 .

For this purpose, for example, two or more injection processes are provided, in which, for example, first the inner component 52 is injection molded or molded onto the stiffening elements 21, then the outer component 51. A preferred variant of the production provides that first the inner component 52, then the stiffening elements 21, in particular also in one piece, the tubular body 11 and then the outer component 51 are injected or cast.

In such an injection molding process, webs 53 are formed, for example, which fill in the gaps or distances between the stiffening elements 21, ie the circumferential distances 24. Between the webs 53 there are wall sections 54 which cover the so to speak radially inner side of the stiffening elements 21 . The wall sections 54 are compared to the webs 53 somewhat thinner, for example skin-like. However, they preferably completely cover the stiffening elements 21 on the inside, so that they are covered with the elastic material of the inner component 52 in the area of a plug-in receptacle 55, which delimits them radially on the outside.

In the case of the outer component 51, webs 53 are expediently also provided, between which there are wall sections 57. The wall sections 57 cover the stiffening elements 21 on the outside, ie form an outer wall of the plug-in section 50, while the webs 53 of the outer component 51 and the inner component 52 connect to one another and fill the gaps or gaps between the stiffening elements 21. It can be seen that the webs 53 are elastically flexible due to the elastic material of the outer component 51 and the inner component 52, so that the stiffening elements 21, which are sheet-like or lamellar-like, can move towards or away from each other at least in the area of their free longitudinal ends 23. This mobility is further facilitated by the fact that the transverse spacing 24 between the stiffening elements 21 is greater in the area of the free longitudinal ends 23 than in the area of their other longitudinal end areas or foot areas 22 .

In figure 4 the plug-in section 50 is drawn completely, ie the inner component 52 is already connected to the outer component 51. The base material of the plug-in section 50 is connected as homogeneously as possible by the fastest possible injection molding process, with which the two components 51, 52 are produced. It is also conceivable that the plug-in section 50 is injection molded or cast onto the stiffening structure 20 or the tubular body 11 as a whole (in one injection molding process or casting process). In any case, cavities 59 for the stiffening elements 21 are provided on the plug-in section 50 or its plug-in section base body 60 .

On an inner circumference of the socket 55 there is also a rib structure 56, which is expediently formed by the elastic or elastomeric material of the inner component 52 and provides a firm hold and/or a high degree of tightness, for example on a relatively smooth connecting piece or connecting piece 505, for example, according to the hand-held power tool 500 Figures 15, 16 can produce. For example, the connecting element 505 can be inserted into the plug-in receptacle 55 or the connecting piece 10 can be plugged onto the connecting counterpart 505 .

The rib structure 56 includes one or more annular, in particular circumferential, longitudinal locking contours 61, for example grooves 62. These enable longitudinal locking with longitudinal locking counter-contours 302 on a plug-in section 301 of the mating connector 300, which can be inserted into the plug-in receptacle 55. The connecting counterpart 300 can be connected to a suction hose, a hand-held power tool or the like, for example by means of clamping arms or holding arms 303, between which there are expediently distances 304. On the holding arms 303 there is, for example, a thread or a latching structure 305 for screwing or latching with a connection element, in particular a suction hose or a hand-held power tool or a vacuum cleaner. This is only to be understood as an example, since the plug-in section 301 is essential here, while the other side 307 with, for example, the holding arms 303 can certainly be designed alternatively. For example, it is possible for the side or portion 307 to form an integral part of a handheld power tool, vacuum cleaner or the like.

The mating connector 300 can be a component made of polypropylene or another hard plastic, for example. However, the elastically flexible plug-in section 50 of the connection piece 10 yields somewhat when the plug-in section 301 of the connection counterpart 300 is inserted, for example in the sense of widening, so that the rib structure 56 and thus the longitudinal locking contours 61 can engage with the longitudinal locking counter-contours 302 and these in one Pull direction or direction of a longitudinal axis L of the plug-in section 50 hold. At the same time, there is an optimal frictional connection, because the base material of the plug-in section 50 expediently has a high coefficient of friction, at least a higher coefficient of friction than the material of the tubular body 11.

The relatively soft, in any case flexible, plug-in section 50 can also widen to such an extent or be so flexible that a mating connector 350 can be inserted into the plug-in socket 55, which has counter-contours 352 with a rotationally positive fit on its plug-in section 351. These interact with rotary form-fitting contours 75 of the connection piece 10, namely with a form-fitting projections 26 protruding inwards into the plug-in receptacle 55. The connection counterpart is in figure 8 shown.

It is conceivable, for example, that a front section of a connecting piece 380, which corresponds approximately to the connecting piece 300, has rotationally positive-locking counter-contours 352, which is shown in figure 7 is indicated. The rotary form-locking counter-contours 352 can be brought into engagement with the rotary form-locking contours 75 or the form-locking projections 26 of the connecting piece 10 .

The positive-locking projections 26 could, for example, be formed integrally from the base material of the plug-in section base body 60, for example from the inner component 52. In the present case, however, the configuration is such that the positive-locking projections 26 are arranged on the stiffening elements 21 and are inserted through recesses 58 in the inner component 52 into the Plug-in receptacle 55 of the connecting piece 50 protrude. There they form cams that can engage with the rotationally positive-locking counter-contours 352 or rotationally positive-locking contours 70 that will be described later. In terms of geometry and shape, the rotationally positive-locking counter-contours 352 correspond in principle to rotationally positive-locking contours 70 on the outer circumference of the plug-in section 50 or of the connection piece 10, which will be explained in more detail below.

The form-fitting projections 26 can, for example, comprise form-fitting parts 27 and 28 which are arranged on adjacent stiffening elements 21 . The form-fitting parts 27 and 28 can, as in figure 3 shown to be separate components but connected to one another by inner component 52 or outer component 51 . Thus, for example, a section with elastic plastic or the like can be located between the form-fitting parts 27 and 28 .

A preferred embodiment is in figure 2 indicated, where form-fitting parts 27' and 28' are connected to form a common form-fitting projection 26 with a section 26', so to speak. However, there is still a recess 29 between the sections or parts 27', 28', so that the sections or parts 27', 28' bridge the circumferential distance 24 of the stiffening elements 21 on which they are arranged with the section 26', but are movable relative to each other due to the recess 29. The form-fitting projection 26 according to the embodiment in figure 2 is therefore formed on the basis of two form-fitting parts 27' and 28', which are arranged on adjacent stiffening elements 21, but which, due to the recess 29, hinder the relative movement of the stiffening elements 21 towards or away from one another less than a solid form-fitting projection 26, so to speak, would do . The recess 29 is expediently filled with elastic material, for example the inner component 52, but could also be free, that is to say contain only air.

It can also as in the embodiment according figure 6 slot-like recesses 29' may be provided in a respective form-fitting projection 26.

The positive-locking projections 26 protrude inwards through recesses 58 in front of the inner component 52 into the plug-in receptacle 55 . Thus, the form-fitting projections 26 are formed from a relatively hard material, such as polypropylene, which ensures high dimensional accuracy and resilience.

It goes without saying that the positive-locking projections 26 can also be at least partially encased by the material of the plug-in section base body 60, which is shown in figure 4 is indicated. For example, the positive-locking projections 26 next to the recess 58 or in the region of the recess 58 are at least partially or completely covered by wall sections 58 ′, for example of the inner component 52 . The relatively soft material of the wall sections 58' increases, for example, the frictional connection with associated counter-positive-locking contours, for example the rotary positive-locking contours 70, which will be explained below.

The rotary form-locking contours 70 include a circumferential rotary form-locking contour 71, which is suitable for engaging, for example, the form-locking projection 26. The form-fitting projection 26 forms, for example, a rotary form-fitting body 75.

The connection piece 10 can be positively connected and locked to a similar, so to speak compatible connection piece 10 by means of the plug-and-rotate movement, which will be described later. The connection with a counterpart connection 200 is explained below as an example, which is shown in cross section in figure 6 is shown. The mating connector 200 has, for example, on a peripheral wall 201 delimiting its plug-in receptacle 255 , rotationally positive-locking counter-contours 276 protruding inwards into the plug-in receptacle 255 , for example cams, projections or the like. On the outer circumference of the plug-in receptacle 255 or on the outer circumference of the peripheral wall 201, further counter-contours 275 are provided, which fit, for example, in the form-locking contours of a connection piece designed as grooves.

A respective rotary form-locking counter-contour 276 can be introduced into the circumferential rotary form-locking contour 71 through a longitudinal guide contour 80 . This happens, for example, when the counterpart connector 200 is plugged onto the connector 10, namely its plug-in section 50.

The rotationally positive-locking counter-contour 276 is designed, for example, as an essentially cuboid block or hump. However, the functionality of the rotary form-fitting counter-contour 276 is also provided by each of the form-fitting projections 26 , the form-fitting projections 26 forming the rotary form-fitting contours 75 being even more optimally adapted to the inner contour or form-fitting contour of the circumferential rotary form-fitting contour 71 .

The longitudinal guide contour 80 is designed, for example, as a slot or guide channel. The rotary form-locking contour 75 or the rotary form-locking counter-contour 276 can be along side walls or side surfaces 81, 82 of the longitudinal guide contour in the direction of the circumferential rotary form-locking contour 71 or from this be moved out along the longitudinal axis L. The longitudinal guide contour 80 and the circumferential rotary form-locking contour 71 are, for example, approximately right-angled or hook-shaped relative to one another. The distances between the side walls 81, 82 are preferably so large that the rotary form-fitting contour 75, namely a form-fitting projection, still has some play with its side surfaces 78, 79 in relation to the side walls or side surfaces 81, 82, but a longitudinal guide in the direction of the longitudinal axis L learns.

A side surface or side wall 72 and an opposite side wall or side surface 74 of the circumferential rotary form-locking contour 71, which are designed as a groove or slot, preferably converge in the direction of an end wall 73, i.e. the end area of the circumferential rotary form-locking contour 71, so that the circumferential rotary form-locking contour in the area of the end area or the end wall 73 is somewhat narrower than at its opening to the longitudinal guide contour 80. As a result, the rotary form-fitting contour 75 or rotary form-fitting counter-contour 276 accommodated between the side surfaces or side walls 72, 74 is, so to speak, clamped or fixed in place at least with respect to the longitudinal axis L.

The rotary form-fitting body 75 or the rotary form-fitting counter-contour 276 are thus inserted into the longitudinal guide contour 80 as part of an insertion movement along the longitudinal axis L, with a marking 84 or an index facilitating the insertion of the rotary form-fitting body 75 or the rotary form-fitting counter-contour 276.

At the end of this plug-in movement along the longitudinal axis L, the positive-locking body 75 or the rotationally-positive-locking counter-contour 276 hit the longitudinal end region 83 of the longitudinal guide contour 80 . Subsequently, the connection piece 10 and the connection counter-piece 275 or a complementary connection piece 10 having the form-fitting body 75 are to be rotated relative to one another about the longitudinal axis L, with the form-fitting body 75 or the rotationally form-fitting counter-contour 276 then being rotated into the groove or peripheral rotationally form-fitting contour 71. The rotational movement ends when the form-fitting body 75 or the rotary form-fitting counter-contour 276 strikes the longitudinal end area or the end wall 73 of the circumferential rotary mold locking contour 71 . A further marking 85 is assigned to this rotational end position.

The side walls 72, 74 assigned form-fitting surfaces or side faces 76, 77 of the rotary form-fitting contour 75, for example the form-fitting projection 26, preferably run obliquely to one another in accordance with the position of the side walls 72, 74, which results in the already mentioned wedge effect or jamming when the rotary end position or the rotary form-fitting concludes is achieved, additionally reinforced or improved.

The side surface 76 and the side wall 72 are designed as inclined surfaces 76a, 72a or have inclined surfaces 76a, 72a which, when the connection piece 10 is rotated relative to a connection counterpart, for example a similarly configured connection counterpart 10 (see figure 2 ) or the mating connector 200, ie when the two components are rotated relative to one another about the longitudinal axis L, cause an axial adjustment or displacement of the two components along the longitudinal axis L toward one another. The operator therefore only has to turn the connection piece 10 and/or the connection counterpart in order to move the two components along the longitudinal axis L relative to one another, in particular to brace them. It goes without saying that one of the inclined surfaces 76a or 72a is sufficient for such a shifting effect or bracing effect.

A latching contour 86 , for example a rib 87 , is also provided between the longitudinal guide contour 80 and the circumferential rotary mold locking contour 71 . If rotary form-locking counter-contour 276 or rotary form-locking contour 75 is to be moved out of longitudinal guide contour 80 into circumferential rotary form-locking contour 71 or out of it in the direction of longitudinal guide contour 80, it must be moved past latching contour 86, so to speak. Thus, there is a latching in the direction of rotation or circumferential direction about the longitudinal axis L, which secures the rotationally positive connection.

The rib 87 is preferably made of the softer or more elastic material of the plug-in section base body 60, so that it is elastically flexible and thus allows the rotationally positive-locking contour 75 or the rotationally positive-locking counter-contour 276 to move past it.

In addition to the already described longitudinal locking contours 61 in the plug-in socket 55, longitudinal locking contours are also provided on the outer circumference of the plug-in section 50, namely longitudinal locking contours 90. A so to speak imaginary course 92 of the circumferential groove 91 is in figure 1 implied. The circumferential groove 91 thus communicates with the longitudinal guide contours 80 (3 longitudinal guide contours 80 are provided at an angular distance, preferably an equal angular distance, from one another), although this is not intended to be essential here. In any case, a mating latching contour, for example in the form of a rib structure, an annular latching projection protruding radially inward into a plug-in receptacle of a mating connector, a hook or the like, can be latched into the radially outer longitudinal latching contours 90 or provided on the outer circumference of the plug-in section 50, in order to secure the connector 10 to be connected to the connection counterpart, not shown, so to speak, in the pulling direction or in the longitudinal direction.

In the embodiment according to Figures 5, 6 and 7 it is expediently provided that the plug-in section 50, in particular the outer component 51, is electrically conductive. Thus, for example, static electricity can be discharged.

However, a relatively hard plastic is particularly suitable for being electrically conductive. Then can in a particularly favorable manner by the multi-component design of the connector 10 in the embodiment according to Figures 1 and 2 nevertheless, the necessary electrical conductivity can be produced, namely if corresponding recesses are provided on the more elastic component or soft component, which are penetrated by parts of the harder component, which is electrically conductive. For example, an electric Contact arrangement 30 is provided with electrical contact sections 31, 32 which protrude radially outwards in front of the outer component 51. The rib 87 or latching contour 86 and/or at least one of the form-fitting projections 26 can also be designed as an electrically conductive component. Further electrical contact surfaces 33 are preferably provided, for example in the area of the rib structure 56, so that at least on the inside in the plug-in receptacle 55 the form-fitting projections 26 and these further contact surfaces 33 are available for establishing an electrical connection.

At this point it should be noted that the latching contour 86 or rib 87 can also be formed by a relatively hard component of the connecting piece 10, for example as a projection on one of the stiffening elements 75 which protrudes in front of the outer component 51.

It is preferably provided that, in the case of a connection piece according to the invention, a plurality of circumferential rotary form-locking contours and, if appropriate, a plurality of longitudinal guide contours communicating with them are provided. In the case of the connecting piece 10, for example, 3 such configurations are provided at a uniform angular spacing. In this sense, 3 form-fitting projections 26 or rotary form-fitting contours 75 arranged at the same angular distance are also provided.

While the rotary form-locking contours 70 form external rotary-locking contours, so to speak, the rotary form-locking contours 75 are internal rotary-locking contours, so to speak. Of course, it is possible, for example in connection counterpart 200, which can also be regarded as a connection piece within the meaning of the invention, that both inside and outside in the area of plug-in receptacle 255 there are rotary form-locking contours of the same type, namely cam-like rotary form-locking counter-contours 275, 276 . Here, too, 3 inner rotationally positive-locking counter-contours 276 arranged at the same angular distance from one another and outer rotationally positive-locking counter-contours 275 are provided.

The mating connector 52, on the other hand, has a peripheral wall 278 that delimits a plug-in receptacle 255, but does not include any rotationally positive-locking contours or rotationally positive-locking counter-contours. This is typically also the case with known handheld power tools, for example with the in figure 16 shown variant. However, the plug-in section 50 can also be plugged into the plug-in receptacle 255 of the mating connector 250 and can be compressed so that it optimally adapts to the inner contour of the plug-in receptacle 255 .

In the previous exemplary embodiments, the connection piece according to the invention was shown as a component arranged on the suction hose 100, for example. However, it can also be part of a vacuum cleaner or a hand-held machine tool, which will become clear below.

For example, at the free end of a suction hose 100 of a vacuum cleaner 600 according to FIG figure 9 a connection piece 10 according to the invention. The suction hose connection 605 of the vacuum cleaner 600, which is arranged, for example, on the front side 602 of its housing 601, can be of a conventional type. For example, the suction hose 100 is attached to the suction hose connection 605 . The other connection of the suction hose 100 intended for connection to the hand-held power tool 700 or 500, for example, is provided with the connecting piece 10 ( figure 10 ) The rotary form-fitting contours 70 present there, as well as the latching contour 86, ensure optimal hold of the connected hand-held power tool.

Of course, only the mating connector 52 can also be plugged onto the connector 10, for example.

However, it is also possible, for example, for the connection piece 10 according to the invention to be provided on the vacuum cleaner 600 instead of the suction hose connection 605 which, for example, only has a socket or a sleeve ( figure 12 ). This can then be provided, for example, for connecting a mating connector 200 or a similar connector 10, in order to enable the suction hose 100 to be held better. However, in the embodiment according to figure 12 a suction hose 100 is connected to a connecting piece 250 on the connecting piece 10 of the vacuum cleaner 10 .

A hand-held power tool 700, for example a grinding machine, has a drive motor 702 for driving a grinding tool 703. During operation of the hand-held power tool 700, dust accumulates, which is guided through a dust guide channel 704, which penetrates the housing 701, in the direction of a dust outlet 705 will. A connecting piece 10 according to the invention can be connected to this, which for example has a rib structure like the connecting counterpart 380, for example plugged onto the dust outlet 705 ( figure 13 ). Alternatively, it is also as in figure 14 shown, it is possible, for example, for a connecting piece 707 having rotationally positive locking contours 75 to be provided. The rotary form-locking contours 75 can, for example, be brought into engagement with the rotary form-locking contours 70 of a connection piece 10 according to the invention.

In the case of the hand-held power tool 500 according to Figures 15-19 can for example as in figure 16 a conventional connecting piece can be provided as the connecting counterpart 505 . Its peripheral wall 506 delimits, for example, a plug-in socket 507 into which the connecting section 50 of a connecting piece 10 according to the invention can be plugged, see for example figure 19 . For example, a motor 502 arranged in the housing 501 of the hand-held power tool 500 drives a tool 503, for example a saw blade.

Alternatively, as in the Figures 15 and 17 shown, provided that a counterpart connection 550 is arranged at the end of a dust guide channel 504 of the hand-held power tool 500 . Dust, chips or the like, for example, which occur during operation of the hand-held power tool 500 flow through the dust-guiding channel 504 . On the connecting counterpart 550, counter-contours 576 are arranged radially on the inside and contours 575 are arranged radially on the outside on a circumferential wall 577, which is a plug-in receptacle limited. Both when plugging on and when plugging in a connection piece according to the invention, for example the connection piece 10, counter-contours which ensure a particularly firm hold when the train is pulled with respect to the longitudinal axis L are therefore provided.

At this point it should be mentioned that the counterpart connector 550 can consist exclusively of relatively hard plastic and represents a connector within the meaning of the invention, since it has rotary form-fitting contours or rotary form-fitting counter-contours both radially inside and radially outside on its plug-in section.

In the embodiment according to figure 18 a connection piece 10 is arranged at the dust outlet of the hand-held power tool 500, for example fixed or detachable. This preferably consists of a hard component and a soft component, as explained, and/or has both the longitudinal guide contour and 80 and the rotary form-fitting contours 70 on its plug-in section, so that a particularly firm hold, for example, of the mating connector 200 is possible.

The peripheral wall 201 may be made of a relatively hard plastic such as polypropylene. The plug-in section 50 to be inserted into the plug-in socket 255 in the interior of the peripheral wall 201 consists at least on its outer circumference of a plastic that is softer in comparison, whereby a particularly good, frictional hold and also a high degree of tightness can be achieved. However, it is also quite possible that the peripheral wall 201 also consists of soft plastic, in particular the same plastic material as the plug-in section 50. It is also conceivable that the peripheral wall 201 is reinforced by stiffening elements of the type of stiffening elements 21. For example, strip-shaped stiffening elements 221 are provided. The stiffening elements 221 have an incline with respect to the longitudinal axis L, so unlike the stiffening elements 21 do not run parallel to the longitudinal axis L. The mating connector 200 forms both the configuration with a hard peripheral wall 201, i.e. a hard plug-in section 250, and with soft or with stiffening elements 221 or 21 reinforced plug-in section 250 each represents an optimization compared to known connecting pieces or connecting counterparts. The connecting counterpart 200 can form a component, for example, of the hand-held power tool 500 or 700 or also of the vacuum cleaner 600, for example in each case as a connection for the suction hose.

Claims (15)

1. Suction hose connecting piece (10) for a suction hose (100) designed to create a flow connection, in particular from a machine tool to a vacuum cleaner, said connecting piece (10) comprising a tubular body (11) with a circumferential wall which delimits a flow channel and a plug section (50) arranged on said tubular body (11) designed to create a plug connection with a mating connecting piece, wherein the connecting piece (10) and the mating connecting piece can be plugged together along a longitudinal axis (L) of the plug section (50), wherein that at least one rotational form-fit contour (70) is arranged on the plug section (50) in order to create a form-fit connection with a rotational form-fit mating contour of the mating connecting piece, wherein at least one rotational form-fit contour (70) can be brought into or out of engagement with the rotational form-fit mating contour through a relative rotational movement of the connecting piece (10) and the mating connecting piece, characterised in that a longitudinal latch contour (61) is arranged on the plug section (50) which counteracts detachment of the mating connecting piece from the connecting piece (10) relative to the longitudinal axis (L) and which engages with a mating longitudinal latch contour of the mating connecting piece when the mating connecting piece is plugged onto the connecting piece (10) along the longitudinal axis (L) of the plug section (50), and in that the longitudinal latch contour (61) can be brought into snap-locking engagement or out of snap-locking engagement with a mating latch contour of the mating connecting piece through a longitudinal movement or sliding movement parallel to the longitudinal axis (L) of the plug section (50) and, in order to achieve a spring effect, the consists of an elastic material and/or is arranged on an elastic section of the connecting piece (10).
2. Suction hose connecting piece according to Claim 1, characterised in that the longitudinal latch contour (61) comprises an annular, in particular peripheral, groove and/or an annular, in particular peripheral projection.
3. Suction hose connecting piece according to Claim 1 or 2, characterised in that the at least one longitudinal latch contour (61) is arranged on an inner periphery of the plug section (50) or an outer periphery of the plug section (50) and/or that the at least one longitudinal latch contour (65) and the at least one rotational form-fit contour (70) are both arranged on an outer periphery or an inner periphery of the plug section (50) and/or that, of the at least one rotational form-fit contour (70) and the at least one longitudinal latch contour (65), one is arranged on the inner periphery and one on the outer periphery of the plug section (50).
4. Suction hose connecting piece according to any one of the preceding claims, characterised in that the longitudinal latch contour (61) forms a component of an arrangement of at least two longitudinal latch contours (61) which are arranged next to one another or behind one another relative to the longitudinal axis (L) and/or the longitudinal latch contour (61) comprises a ribbed structure (56) and/or in that the at least one rotational form-fit contour (70) is arranged, in a plugging direction, behind or in front of the longitudinal latch contour (61), so that on being plugged onto the connecting piece (10) the mating connecting piece first comes into contact with the longitudinal latch contour (61) and then with the rotational form-fit contour (70), or vice versa.
5. Suction hose connecting piece according to any one of the preceding claims, characterised in that the at least one rotational form-fit contour (70) comprises at least one peripheral rotational form-fit contour (71) running helically or at an angle, in particular a right angle, relative to the longitudinal axis (L) of the plug section (50), in particular in the form of a peripheral groove, and/or a thread and/or bayonet-type rotational form-fit contour (70) or at least one form-fit projection, in particular a cam, designed to screw into a rotational form-fit mating contour running in a peripheral direction around the longitudinal axis (L) of the plug section (50).
6. Suction hose connecting piece according to any one of the preceding claims, characterised in that the at least one rotational form-fit contour (70) comprises at least one inner rotational form-fit contour (75) arranged on an inner periphery of the plug section (5) to accommodate a mating outer rotational form-fit contour arranged on an outer periphery of the mating plug-in connecting piece and at least one outer rotational form-fit contour (7) arranged on an outer periphery of the plug section (5) to accommodate a mating inner rotational form-fit contour arranged on an inner periphery of the plug-on mating connecting piece, wherein it is advantageously provided, that the at least one inner rotational form-fit contour (70) and the mating inner rotational form-fit contour and/or the at least one outer rotational form-fit contour (70) and the mating outer rotational form-fit contour have identical contours.
7. Suction hose connecting piece according to any one of the preceding claims, characterised in that it has at least one latch contour (86) which can be brought into snap-locking engagement or out of snap-locking engagement with a mating latch contour of the mating connecting piece through the relative rotational movement of the connecting piece (10) and the mating connecting piece around the longitudinal axis (L) of the plug section (50), wherein it is advantageously provided that, in order to achieve a spring effect, the at least one latch contour (86) consists of an elastic material and/or is arranged on an elastic section of the connecting piece (10) and/or that the at least one latch contour (86) comprises a snap-locking recess running transversely to the relative rotational movement or a snap-locking projection running transversely to the relative rotational movement, in particular a rib (87).
8. Suction hose connecting piece according to any one of the preceding claims, characterised in that the plug section (50) consists of a softer or more yielding material or comprises a softer material than the tubular body (11) supporting the plug section (50) and/or that at least one of the rotational form-fit contours (70) and/or at least one latch contour (86) is elastically yielding and/or arranged on an elastically yielding main plug section body or basic material of the plug section (50) and/or that at least one of the rotational form-fit contour (70) or at least one latch contour (86) consists of a harder material than the main plug section body of the plug section (50) carrying the rotational form-fit contour (70) or latch contour (86).
9. Suction hose connecting piece according to any one of the preceding claims, characterised in that at least one form-fit contour, in particular the at least one rotational form-fit contour (70) or the at least one latch contour (86) is provided on a form-fit body which comprises a recess (29) which is suitable for deformation of the form-fit body, so that the form-fit body yields on being brought into engagement with the associated mating contour, in particular the rotational form-fit mating contour or mating latch contour, and/or brought out of engagement with the mating contour, and/or that the rotational form-fit contours (70) or the at least one latch contour (86) associated therewith can, through the elastic deformation, be brought into snap-locking engagement or out of a snap-locking engagement with the rotational form-fit mating contours or a mating latch contour.
10. Suction hose connecting piece according to any one of the preceding claims, characterised in that it comprises at least one form-fit body for forming a form-fit contour, in particular the at least one rotational form-fit contour (70) or a latch contour (86), the basic material of which is covered, at least in sections in the region of the rotational form-fit contour, with a softer or more elastic material or one with a higher friction coefficient relative to the basic material.
11. Suction hose connecting piece according to any one of the preceding claims, characterised in that is has a mounting (40) for a suction hose (100), in particular arranged in a fixed manner on the tubular body (11) and/or mounted on the tubular body (11) so as to be resistant to displacement relative to the longitudinal axis (L) and/or rotatable, and/or it forms a component of a suction hose (100) or of a vacuum cleaner or a hand-held machine tool and/or it forms an adapter for connecting two tubular components, in particular for connecting two suction hoses, and/or that it forms a system comprising the connecting piece and the mating connecting piece.
12. Suction hose connecting piece according to any one of the preceding claims, characterised in that its softer material has a hardness of 40/100 Shore A, in particular 50/90 Shore A, particularly preferably 60/80 Shore A, and its harder material has a hardness of 30/100 Shore D in particular 30/70 Shore D, particularly preferably 30/60 Shore D, and/or that its less elastic material has a modulus of elasticity of 800/2500 N/mm², in particular 1000 to 1800 N/mm², and its more elastic material has a modulus of elasticity of at most 800 N/mm², expediently of at most 700 N/mm², particularly preferably of at most 600 N/mm², and/or that its more resilient, in particular more yielding material has an elongation at break of >70 %, in particular of >80 %, particularly preferably >100 % and its less resilient or elastic material has an elongation at break of >30 %, in particular >40 % or >50 % and/or that its softer material comprises or is a thermoplastic elastomer and/or that its harder material comprises or is polypropylene or polyamide comprises and/or its stiffer material or reinforcing material is at least 1.5 times, expediently at least twice or three times as stiff as its less stiff material, in particular the basic material of the tubular section.
13. Suction hose connecting piece according to any one of the preceding claims, characterised in that it comprises a first material which is less electrically conductive than a second material, wherein the second material, at least in sections, projects before the first material in order to create an electrical connection with the mating connecting piece or is arranged before the first material, and/or that a longitudinal latch contour (61) is arranged on the plug section (50) which counteracts detachment of the mating connecting piece from the connecting piece (10) relative to the longitudinal axis (L) which engages with a mating longitudinal latch contour of the mating connecting piece when the mating connecting piece is plugged onto the connecting piece (10) along the longitudinal axis (L) of the plug section (50)
14. Suction hose connecting piece according to any one of the preceding claims, characterised in that the connecting piece (10) has a tubular section (35), structured as a multiple-component section, with a longitudinal axis (L), in particular forming or comprising the plug section (50), wherein, as a second component, at least one elongated stiffening element (21) made of a stiffening material which is harder and/or which exhibits higher tensile strength and/or flexural strength and/or greater stiffness in comparison with the basic material is embedded in a basic material of the tubular section (35) forming a first component.
15. Device with a suction hose connecting piece according to any one of the preceding claims, wherein the device is a suction hose (100) or a machine tool or a hand-held machine tool (700, 500) or a vacuum cleaner (600).

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