EP0757902A1 - Double-locking coupling for a vacuum cleaner hose - Google Patents

Abstract

The suction tube comprises a clamping body (14 15) which engages a locking element (11) in a positive fit manner in an intermediate space (16) above the oblique sliding planes (123). The moveable slider (6) has guides (19) in a V-formation for two projections (17 18) forming part of the locking element (11). The clamping bodies are movable from the locking position along the oblique sliding planes. The locking element has a T-shaped cross section.

Description

The invention relates to a telescopic vacuum cleaner suction tube with an outer tube and an inner tube with locking recesses, in which engages the outer tube coupling and unlockable via a manually operated slide locking element, which is held by a pressure-loaded locking spring when the slide is not actuated in its locking position and when the Slider against the force of the locking spring is movable to a relative displacement of the inner tube and outer tube in its unlocked position.

In a telescopic vacuum cleaner suction tube of this type according to EP 0 520 534 A1, the locking element consists of a locking plate with ends which are spherical in cross section, of which one end is pivotally guided in a sleeve with a joint recess encompassing the inner tube and the other end into the respective one Interlocking recess of the inner tube engages. In order to keep the plate-shaped locking element in its locked position, there is a standing spring under the pretensioned, pressure-loaded locking spring in the outer tube provided with a concentric extension Slide slidably guided, which is always pushed by the locking spring into a position of the locking position holding down the locking element. When the slide is actuated against the force of the locking spring, the latching element is released, so that its spherical end, depending on the relative displacement from the outer tube to the inner tube, either pulls it out or pushes it out of the latching depression of the inner tube, with a slight swiveling movement around it, other than a swivel joint End.

This telescopic vacuum cleaner suction tube has the disadvantage that unlocking with the slide takes place only when the outer tube is pulled apart from the inner tube in the direction of handling, but not when pushed together. When pushing together the outer tube to the inner tube, the slide must be actuated in the opposite direction to the pressure against the action of the locking spring.

Another disadvantage is that, in the event of a sudden pressure load on the inner tube or the outer tube, the locking element can push the slide against the force of the locking spring so far that it is moved from the momentary into the locking recess closest to the pressure direction.

And finally, this vacuum cleaner suction tube has the disadvantage of a sleeve-like extended outer tube, which not only makes the production more expensive, but also requires a quite large sleeve between the inner tube and the outer tube in order to be able to arrange the slide functionally.

Another telescopic vacuum cleaner suction tube of the type mentioned is disclosed in DE 41 01 049 A1. The locking element consists of a ball or a rolling element which is held down in its locking position by a slide which acts under the action of one or two locking springs. As soon as the slide is moved against the action of the compression and / or tension-loaded locking springs in such a way that one of the recesses in the slide reaches the locking body, the inner tube can be moved relative to the outer tube. In this embodiment, in addition to the sleeve-like expanded outer tube, it is to be regarded as a disadvantage that, in the event of intermittent pressure loading of the inner and / or the outer tube under the force of gravity and under the rolling friction friction of the locking element, the slide can snap over into another locking recess against the action of the locking spring of the locking body .

The same disadvantages can also be found in vacuum cleaner suction pipes according to DE 37 18 578 C2 and DE 42 00 527 A1.

Because all of these telescopic vacuum cleaner suction pipes have a disadvantage in common that the respective locking element, whether swivel plate, locking ball, locking pin or locking cylinder can only cause their locking position by a corresponding hold-down element in the slide, which is under the action of the locking spring. This locking position is only ensured as long as the respective locking spring is not tired or is too weak. But even with a proper locking spring, the slide can be moved into an unlocked position when the inner and / or the outer tube is subjected to a sudden load as a result of the resulting gravitational force pulse in conjunction with the rolling or sliding friction forces exerted on the latching body. In this respect, the effect of the respective locking element can only be described as "passive", since it always depends on the hold-down position of the slide. A too strong pressure-loaded locking spring, for example a spring that is too hard with a correspondingly steep characteristic curve, proves to be ergonomically unfavorable because then the slide must be actuated against the action of this hard locking spring when unlocking the latching element, which under certain circumstances can still counteract the pressure - or pulling direction of the telescopic vacuum cleaner suction pipe.

Starting from this prior art, the invention has for its object to a telescopic vacuum cleaner suction tube of the type mentioned create which, on the one hand, with only a slight preload of the locking spring with a relatively soft spring characteristic, ensures easy handling of the slide in an ergonomically favorable manner in the respective handling direction and, on the other hand, with the sleeve-like extension in the outer tube becoming dispensable, an always compact locking mechanism even when the outer and inner tubes are subjected to impact loads ensures.

This object is achieved in connection with the generic term mentioned at the outset in that the latching element can be displaced from two at an opposite acute angle with respect to the longitudinal axis of the outer tube on an inclined sliding plane of a guide body which is positively inserted into a recess in the outer tube and engages in separate latching recesses exists, of which the respective relative movement from the inner to the outer tube locking body to solve this locking position on the slide from its locking recess out along its inclined sliding plane.

In a departure from the entire state of the art, the locking spring no longer serves to "actively" lock a "passive" locking element, but merely to ensure that the respective locking element occupies the position between the outer tube and the inner tube, in order to literally with a relative pressure or pull the friction between the guide body fastened in the outer tube and the locking recess located in the inner tube to be drawn into the gap between the two tubes. For the first time, the locking element no longer takes part in the locking action in the form of a clamping wedge, but rather actively and therefore directly - even without the action of the locking spring. This type of locking could be called automatic self-locking of the locking element.

The locking spring is only necessary to ensure its contact between the guide body in the outer tube and the corresponding surface of the locking recess in the inner tube. This system only requires a soft spring to be adapted to the correspondingly low sliding forces and weights of the sprags with a flat characteristic.

In an advantageous development of the invention, the clamping bodies are designed in such a way that one of them can be pulled like a wedge into a progressively increasing clamping position that is largely independent of the pressure effect of the locking spring when the outer tube is pressed relative to the inner tube and vice versa. To solve the locking position of the outer tube with the inner tube, the locking clamp body can be raised against the force of the locking spring against the force of the locking spring on the outer circumferential line of the inner tube via the slide out of its locking recess, while at the following relative movement from the outer tube to the inner tube, the other clamping body can likewise be pushed up against the force of the locking spring onto the outer circumferential line of the inner tube via the rising surface of its locking recess. Since the locking spring only serves to hold down the clamping body, however, as its name suggests, it performs its locking function in the form of a locking wedge to be pulled in between the inner tube and the outer tube in the event of relative pressure or pulling, the locking spring can be made correspondingly soft and flat Spring characteristic. A soft spring, in turn, allows the slide to be operated with little force and thus ergonomically.

If you plot the spring force of a spring in a diagram, you get a spring characteristic of different steepness. The steeper the curve, the harder the spring, while the falling curve is called a soft spring. The pressure-loaded locking spring can consist of a cylindrical coil spring, a correspondingly shaped leaf spring or a double-sided conical spring or a rubber spring.

In a further development of the invention, the clamping bodies have a plate or wedge shape and are at their ends facing the locking recesses with a flat, rounded at the end or a trapezoidal or a wedge-shaped cross-sectional shape.

At their ends facing away from the locking recesses, the clamping bodies are provided with lateral projections which form a form-fitting sliding coupling with corresponding recesses in the slide. However, in the context of a kinematic reversal, it is also readily possible to arrange the projections in the slide and to have them cooperate with corresponding recesses at the end of the clamping body.

When the projections of the clamping body to be lifted from its clamping position with the slider engage, the projections of the other clamping body in the slider are advantageously provided with a freewheel in the direction of thrust of the first clamping body.

In principle, the two acute angles α, β of the two inclined sliding planes can have a different angle with respect to the longitudinal axis of the outer tube, which, however, then requires different wall inclinations of the latching depressions, which are adapted to the corresponding inclination angles, in order to achieve the corresponding wedge effect. For this reason, the two acute angles α, β are advantageously of the same size and, in a preferred embodiment of the invention, each amount to 45 °.

According to an advantageous development of the invention, the two inclined sliding planes arranged at an opposite, acute angle α, β in the guide body for the use of the locking spring acting simultaneously on both clamping bodies are provided with a recess which advantageously engages around the locking spring at least partially in a form-fitting manner. The guide body in turn has a space-saving attachment to the outer tube on its two long sides with locking grooves into which the longitudinal edges of the recess in the outer tube engage in a form-fitting manner, while the narrow sides of the guide body rest completely or partially on the associated narrow edges of the recess of the outer tube. However, it is also possible to provide the guide body for its use in the recess of the outer tube in its peripheral edge regions facing the edges of the recess, in whole or in part, with recesses for positive and / or non-positive locking. In this case, the guide body can be clipped into the outer tube from the inside.

The part of the guide body which passes through the recess in the outer tube is provided with a concave contact surface on the inner tube and has a small thickness which is approximately equal to the difference between the inner tube radius of the outer tube and the outer tube radius plus a slight play of a sliding fit. In this case, the External dimensions of the inner tube and outer tube are only relatively small and in any case do not require a sleeve-like expansion of the outer tube.

After the use of the guide body in the recess of the outer tube and after the use of the clamping body and the locking spring, the slide covering the recess on all sides can be designed to be positively and / or non-positively and relatively displaceable relative to the guide body, or by means of a guide screw or a pin this can be attached and moved.

The clamping body, the guide body and the slide are made of plastic, whereas the locking spring is made of spring steel or of an entropy-elastic material.

Basically, the vacuum cleaner suction tube described above contains an independent anti-rotation device due to the shape of the locking recesses in connection with the clamping bodies and the inventive design with the guide body. However, this is only guaranteed if the two clamping bodies are in their locking recesses. However, in order to ensure that it is secured against rotation even in its raised position, the inner tube is provided in a manner known per se with an axial groove running parallel to its longitudinal axis, into which a locking bar is provided one arranged between the outer tube and inner tube, rotatably coupled with the outer tube via a locking cam coupled plastic circular cylinder.

This above-described embodiment of the invention has the advantage over the entire prior art that the clamping bodies develop a locking effect in the form of an automatically effective clamping wedge with the effect of self-clamping when there is a relative movement between the outer tube and the inner tube. The locking clamp body is drawn into the gap between the two tubes under the effect of the relative movement of the inner tube and the outer tube - and no longer under the action of the locking spring, the locking forces deployed thereby being directly proportional to the pulling force exerted on the outer and inner tube Behave under pressure. The greater the tensile or compressive forces exerted on the outer tube and inner tube, the stronger the clamping forces act. The locking spring acting directly on the clamping body then no longer has a locking function. Their function is exhausted when the outer and inner tubes are unloaded only in a holding function of the clamping bodies in their lowest locking position along the inclined sliding plane, in which the automatic self-clamping occurs when the aforementioned forces are exerted. It can be felt to be disadvantageous that the other, non-clamping clamp body against the biased Lock spring must snap over from its original locking recess into the next locking recess.

In order to avoid this frictional snapping over of the non-clamping clamping body and to reduce the hardness of the tension spring to an ergonomically favorable level, according to a second embodiment of the invention, a locking element in the locking position of the clamping body engages in a remaining space above its oblique sliding planes with a positive fit by the action of the locking spring one, which is guided on two opposite sides perpendicular to the direction of thrust of the slide with two extensions in each case in a side view V-shaped slot guide of the slide and from the slide one after the other the locking element along the V-shaped slot guide can be raised and then the locking clamp body along it inclined sliding plane can be pushed up out of its locking position, whereas the slidable element pushed up one after the other by the slide when it is not actuated under the action of the locking spring Locked position and then the locking element can be pushed back into the space. With this design, the slide is now acted upon by the locking spring and thus loaded, whereas the clamping bodies are no longer acted upon by the locking spring. According to the invention, the locking clamping body is removed from its locking position as before by the slide along the inclined sliding plane pushed up, whereas the other, non-clamping clamping body is spring-loaded and thus can be pushed out of its locking recess against the thrust direction of its inclined sliding plane with little friction. The locking bodies are locked or held in their locking position exclusively in a form-fitting manner under the action of the locking element, which engages in the space between the two clamping bodies above their inclined plane. The locking spring now has the function of returning the slide to an approximately central position relative to the guide body and the locking element when the slide is released. During this retraction, however, the slider is first positively moved by the slider in its locking position down the inclined sliding planes and then the locking element is lowered into its locking position locking the locking body in the space.

The locking spring is advantageously formed by two locking springs, each of which is supported with one end against the slide and the other end against a surface of the guide body. These locking springs advantageously consist of a cylindrical helical spring or a conical spring, which are guided in a partially cylindrical recess in the guide body. With this design, the two locking springs can be made relatively soft and can therefore be provided with a relatively flat spring characteristic. Because these locking springs only need to overcome the friction between the slide and the guide body on which the slide is clipped, whereas the friction between the clamp bodies and the inclined plane on the one hand and the locking element and the guide body on the other hand are negligible. This is especially true when all parts except the springs are made of a low-friction plastic with good sliding properties.

According to an advantageous development of this embodiment, the extensions of the locking element protrude with very little play into the inside recess of the V-shaped slot guide of the slide, the opposite stop edges of which are approximately the same, very small distance from the respective extension when it is not actuated, so that in the same small play is present in both thrust directions of the slide before the stop edges grip the extensions for lifting in the V-shaped slot guide.

The locking element has a T-shaped cross-sectional shape when cut in the direction of thrust, is guided with its vertical web in a vertical slot of the guide body and engages with its angled ends of its transverse web in a recess of the guide body, which the end faces of the clamping bodies directly adjoin. The result The resulting positive connection is such that the locking element cannot be lifted out of this positive locking position by any of the two clamping bodies, whatever the relative movement from the inner tube to the outer tube. Lifting can only be done positively from the slide via the V-shaped slot guide. Even if the slider is shaken, it cannot be lifted because it is held by the two locking springs in such a way that there is no action on the locking element.

In its plan view, the locking element is provided with a cross shape and with its transverse web, which is rectangular in plan view, is fitted into a rectangular recess of the guide body with little play.

Furthermore, each clamping body is guided on its upper side with a projection in a rectilinear slot of the guide body which extends in the direction of thrust of the slide and can be pushed up along the inclined plane by a push extension of the slide which engages in the same slot. The very small distance between the two extensions to the stop edges of the slide on the one hand and the considerably larger distance of the push extensions of the slide to each projection of the clamping body on the other hand are dimensioned so that only the locking element from its recess in the guide body must be raised so far before one Displacement of the clamping body in the direction of this recess is made possible. After a certain lifting of the locking element, the movements of locking element and clamping bodies can overlap and take place simultaneously. The same applies in reverse order. Due to the very small distance of the extensions from the stop edges of the slide, only a correspondingly small advance of the slide is required to release the locking position of the locking element in order to be able to start up the locking clamping element along its inclined sliding plane in the same pushing movement. As a result, the operator can actuate the release with a relatively small thumb feed of the operating hand and thus in an ergonomically favorable manner, the remaining friction forces still to be overcome being negligibly small compared to the effect of the locking springs, which are now also soft in design.

Finally, according to a third embodiment, the frictional snapping over of the non-clamping clamping body and the hardness of the locking spring are reduced by the fact that, in the locking position of the clamping body, a locking element positively engages in a remaining space above its inclined sliding planes, which locking element crosses the longitudinal axis of the outer tube via a lever a movable in the same direction, designed as a push button and can be lifted by the locking spring slider together with the clamps in an unlocked position. Through this design, the slide designed as a push button and no longer the clamping body is now acted upon and loaded by the locking spring. Now the locking element and then the clamping body are lifted from their unlocked position one after the other via the push button and the lever. After the clamping body has been lifted, the outer tube can be moved as desired relative to the inner tube, since frictional forces emanating from the locking spring can no longer be transmitted to the outer surface of the inner tube by holding down the push button. As a result, the relative displacement of the outer tube and inner tube can not only be carried out more easily and quickly, but also ergonomically favorably, because the locking spring can be provided with a correspondingly flat spring characteristic without impairing its function and can therefore be made correspondingly soft. The locking spring now has the function of pushing the locking element into a remaining space between the clamping bodies via the lever when the push button is released after the clamping bodies have assumed their lowest-lying clamping position in the locking recesses. The locking bodies are then locked or held in their locking position exclusively in a form-fitting manner under the action of the locking element, which is located in the space between the two clamping bodies above intervenes on their inclined plane. This pushbutton solution proves to be particularly advantageous because it is easier for the operating hand of a person to grip the outer tube with the fingers of the hand and at the same time press the pushbutton against the action of the locking spring with the ball surface of the thumb. In any case, this is easier than moving a slide parallel to the longitudinal axis of the outer tube with the front region of the thumb against the action of the locking spring.

In the design of the locking element, the lever, the push button and the locking spring, this third embodiment allows completely different designs.

According to a first embodiment, the locking element in the cross-sectional view parallel to the longitudinal axis of the outer tube has a double-T shape, the upper cross bar is shorter than the lower cross bar and the ends of the clamping bodies directly adjoin at the ends in the blocking position. As a result, the upper crossbeam blocks each upward movement of the clamping bodies as soon as they have reached their locking depressions and the locking element is lowered into its locking position via the lever and the locking spring.

The lower, longer crossbar of the locking element engages under the angled upper ends of the clamping bodies when the locking element is lifted, as a result of which they are lifted from the lever into their unlocked position when the push button is actuated together, but slightly offset from one another.

The locking element is advantageously provided in its plan view with a stable cross shape and with its top cross bar, which is rectangular in plan view, is fitted with little play into a rectangular recess in the guide body and guided therein. In this way, a form of positive locking results in a sliding thrust gear, which is formed on the one hand by the clamping body and the locking element and on the other hand by the double-armed lever with the push button arranged at its other end and the locking spring.

According to a first advantageous embodiment, the lever is pivotally mounted in its central region in the guide body and is provided with two lever arms, of which the first lever arm engages the locking element with its free end and of which the second lever arm is engaged by the locking spring when the push button is not actuated at its free end is held in the locking position. The lever arm is advantageous in this embodiment as essentially rectangular wire bracket with rounded corner areas.

The locking spring designed as a cylindrical helical spring, conical spring or leaf spring engages with one end under the underside of the push button and is supported with its other end against the outer peripheral surface of the outer tube on a shaped support dome. Here, the push button advantageously has a hat shape with an oval or circular cross section, the outer circumferential area of which is guided in a form-fitting manner in a recess of the guide body adjacent to the locking element.

According to a second embodiment, the lever is composed of two two-armed levers, which are each mounted opposite one another in the guide body with pivot axes and act on two opposite sides of the locking element with the ends of their first lever arm, whereas they engage on a projection with the free ends of their second lever arm the bottom of the push button.

In this embodiment of the lever arm, the push button advantageously has a guide pin on its underside in its central region, which is encompassed concentrically by the locking spring designed as a cylindrical coil spring, which has one end against the underside of the push button and with it the other end in a central blind hole of the locking element for receiving the coil spring and the guide pin.

Here, the locking spring in the locking position of the clamping body holds the push button in the raised position and the locking element in the lowered position, whereas in the unlocked position the push button presses the free ends of the second lever arms against the pressure effect of the locking spring, while at the same time the ends of the first lever arms counteract the locking element Lift the action of the locking spring together with the sprags into the unlocked position. This embodiment of a lever consisting of two two-armed levers in connection with the central arrangement of the locking spring is characterized by an extremely space-saving design compared to the design with only one two-armed lever.

According to a third alternative, the locking element is wedge-shaped, at the upper end of which the end faces of the two clamping bodies bear directly in the locking position and the lower region of which is provided with a coupling pin which engages in one slot of each clamping body with a lifting clearance.

Here, the locking element is advantageously at its upper end with the end of a first lever arm a double-armed lever connected in the guide body via a swivel axis, the second lever arm is under the action of the locking spring and at the same time forms the push button. In this embodiment too, the locking element is first raised in succession from its locked position by the lever, and after the coupling pin has been raised in the two elongated holes of the clamping body up to its upper edge, the two clamping bodies also become theirs when the lever moves further from the coupling pin Latch recesses raised. In this embodiment, the time delay for unlocking occurs through the elongated holes in the two clamping bodies, since the locking element must first be raised before the clamping bodies can be moved. In this embodiment, the first lever arm, the guide body, the locking body and the clamping bodies are advantageously covered by a housing which is penetrated in a slot by the second lever arm bent at an angle upwards in the vicinity of its pivot axis, which is operated by the leaf spring, cylindrical coil spring or conical spring trained locking spring is engaged.

• Fig. 1 Ansicht eines diametralen Längsschnittes durch das Außenrohr und Innenrohr, durch den Führungskörper mit den Klemmkörpern in ihrer Verriegelungsstellung,
• Fig. 2 die Draufsicht von Fig. 1 bei abgenommenem Schieber,
• Fig. 2a die teilweise diamtrale Querschnittsansicht entlang der Linie IIa-IIa von Fig. 2,
• Fig. 3 eine der Fig. 1 entsprechende Ansicht, jedoch mit in Pfeilrichtung 6a zum Auseinanderziehen von Innenrohr und Außenrohr verschobenem Schieber und dem diese Ausziehposition sperrenden, linken Klemmkörper 14 in angehobener Position,
• Fig. 4 eine der Fig. 3 entsprechende Ansicht, jedoch mit inzwischen erfolgter Relativbewegung von Außenrohr zu Innenrohr und dabei entgegen der Kraft der Sperrfeder auf die Außenumfangslinie des Innenrohres heraufgeschobenem zweiten Klemmkörper,
• Fig. 5 eine der Ansicht der Fig. 1 entsprechende Ansicht zum Ineinanderschieben von Innenrohr und Außenrohr, wobei der Schieber bereits in Pfeilrichtung 6b nach links verschoben und dadurch der rechte sperrende Klemmkörper 15 auf die Außenumfangslinie des Innenrohres angehoben ist,
• Fig. 6 eine der Ansicht der Fig. 5 entsprechende Querschnittsansicht, bei welcher durch die Einschubbewegung von Innenrohr und Außenrohr auch der linke Klemmkörper auf die Außenumfangslinie des Innenrohres hinaufgeschoben worden ist,
• Fig. 7 die Draufsicht von Fig. 4 bei abgenommenem Schieber,
• Fig. 8 die Draufsicht von Fig. 6 bei abgenommenem Schieber,
• Fig. 9 eine Schnittansicht entlang der Linie IX-IX von Fig. 2,
• Fig. 10 einen Längsschnitt entlang der Linie X-X von Fig. 11 in Höhe des Schiebers durch das Innenrohr und Außenrohr, durch die Führungskörper, den Klemmkörpern und das Verriegelungselement in seiner Verriegelungsstellung,
• Fig. 11 einen Schnitt entlang der Linie XI-XI von Fig. 12,
• Fig. 12 einen Schnitt entlang der Linie XII-XII von Fig. 11,
• Fig. 13 eine der Fig. 10 entsprechende Querschnittsansicht, jedoch mit bereits in Pfeilrichtung in der Zeichenebene nach links verschobenem Schieber, wodurch das Verriegelungselement aus seiner Verriegelungsstellung angehoben ist, jedoch beide Klemmkörper noch in voller Tiefe in ihre Rastvertiefungen des Innenrohres eingreifen,
• Fig. 14 eine der Ansicht der Fig. 13 entsprechende Querschnittsansicht, jedoch mit weiter in Pfeilrichtung der Zeichenebene nach links verschobenem Schieber, wodurch das Verriegelungselement in seine höchste Hub-Entriegelungsstellung angehoben und der rechte sperrende Klemmkörper entlang seiner schiefen Gleitebene aus seiner Verriegelungsstellung heraufgeschoben ist,
• Fig. 15 eine der Fig. 14 entsprechende Querschnittsansicht, jedoch mit weiterhin in der Zeichenebene nach links verschobenem Schieber, wodurch auch der zweite linke Klemmköper entgegen seiner Schwerkraft seine schiefe Gleitebene hinaufgeschoben worden ist und ebenso wie der erste Klemmkörper auf der Außenseite des Innenrohres aufsetzt,
• Fig. 16 eine der Fig. 13 entsprechende Querschnittsansicht, jedoch mit in der Zeichenebene nach rechts verschobenem Schieber, wodurch das Verriegelungselement erneut aus seiner Verriegelungsstellung angehoben ist,
• Fig. 17 eine der Fig. 16 entsprechende Querschnittsansicht, jedoch mit in der Zeichenebene weiter nach rechts verschobenem Schieber, wodurch der sperrende linke Klemmkörper aus seiner schiefen Gleitebene nach oben in seine Entriegelungsstellung geschoben ist,
• Fig. 18 eine der Fig. 17 entsprechende weitere Querschnittsansicht, wobei der Schieber in der Zeichenebene noch weiter nach rechts verschoben und dadurch auch der zweite rechte Klemmkörper auf seiner schiefen Gleitebene entgegen seiner Schwerkraft nach oben verschoben worden ist und auf der Außenseite des Innenrohres aufsetzt,
• Fig. 19 einen Längsschnitt entlang der Linie XIX-XIX von Fig. 20 in Höhe des Druckknopfes durch das Innenrohr und Außenrohr, durch den Führungskörper, durch die Klemmkörper und das Verriegelungselement in seiner Sperrposition,
• Fig. 20 die Schnittansicht entlang der Linie XX-XX von Fig. 19,
• Fig. 21 eine der Fig. 19 entsprechende Schnittansicht, jedoch bei eingedrücktem Druckknopf und dadurch über den Hebel vollständig angehobenem Verriegelungselement und den Klemmkörpern aus ihren Rastvertiefungen heraus,
• Fig. 22 eine der Fig. 21 entsprechende Schnittansicht, jedoch nach einem Einschub des Innenrohres in das Außenrohr,
• Fig. 23 die Schnittansicht entlang der Linie XXIII-XXIII von Fig. 24 durch eine zweite Ausführungsform in Höhe des Druckknopfes durch das Innenrohr und das Außenrohr, durch den Führungskörper, durch die Klemmkörper und das Verriegelungselement in ihrer Verriegelungsstellung,
• Fig. 24 die Draufsicht entlang der Linie XXIV-XXIV von Fig. 23,
• Fig. 25 die versetzte Schnittansicht entlang der Linie XXV-XXV von Fig. 24 mit den beiden zweiarmigen Hebeln,
• Fig. 26 eine der Fig. 23 entsprechende Schnittansicht, jedoch nach eingedrücktem Druckknopf und dadurch über die beiden zweiarmigen Hebel angehobenem Verriegelungselement mit den Klemmkörpern aus ihren Rastvertiefungen,
• Fig. 27 eine der Fig. 26 entsprechende Schnittansicht, jedoch mit in der Zeichenebene nach links herausgezogenem Innenrohr,
• Fig. 28 eine der Fig. 26 entsprechende Schnittansicht, jedoch mit in der Zeichenebene nach rechts eingeschobenem Innenrohr,
• Fig. 29 die Schnittansicht entlang der Linie XXIII-XXIII von Fig. 24 einer gegenüber den Figuren 23 bis 28 abgewandelten weiteren Ausführungsform in Höhe des Druckknopfes durch das Innenrohr und das Außenrohr, durch den Führungskörper, durch die Klemmkörper und das Verriegelungselement in ihrer Verriegelungsstellung,
• Fig. 30 die Schnittansicht von Fig. 29 bei eingedrücktem Druckknopf und dadurch bewirkter Entriegelungsstellung der Klemmkörper,
• Fig. 31 einen Längsschnitt durch das Innenrohr und das Außenrohr einer dritten Ausführungsform in Höhe des Druckknopfes, durch den Führungskörper, durch die Klemmkörper und das Verriegelungselement in ihrer Verriegelungsstellung,
• Fig. 32 eine der Fig. 29 entsprechende Schnittansicht, jedoch bei angehobener Stellung des Verriegelungselementes und der Klemmkörper,
• Fig. 33 eine der Fig. 30 entsprechende Schnittansicht, jedoch mit in der Zeichenebene nach links ausgezogenem Innenrohr und
• Fig. 34 eine der Fig. 30 entsprechende Schnittansicht, jedoch mit in der Zeichenebene weiter nach rechts eingeschobenem Innenrohr.

Several different embodiments of the invention are shown in the drawings. Show:

• Fig. 1 View of a diametrical longitudinal section through the outer tube and inner tube, through the Guide body with the clamping bodies in their locking position,
• 2 shows the top view of FIG. 1 with the slide removed,
• 2a shows the partially diamtral cross-sectional view along the line IIa-IIa of FIG. 2,
• 3 is a view corresponding to FIG. 1, but with the slide displaced in the direction of arrow 6a for pulling the inner tube and outer tube apart and the left clamping body 14 blocking this pull-out position in the raised position,
• 4 is a view corresponding to FIG. 3, but with a relative movement from the outer tube to the inner tube which has meanwhile taken place and, in the process, against the force of the locking spring, the second clamping body pushed up onto the outer circumferential line of the inner tube,
• 5 shows a view corresponding to that of FIG. 1 for pushing the inner tube and outer tube into one another, the slide already being displaced to the left in the direction of arrow 6b and the right-hand locking clamping body 15 being thereby raised onto the outer circumferential line of the inner tube,
• 6 shows a cross-sectional view corresponding to the view in FIG. 5, in which the insertion of the inner tube and outer tube has also pushed the left clamping body onto the outer circumferential line of the inner tube,
• 7 shows the top view of FIG. 4 with the slide removed,
• 8 shows the top view of FIG. 6 with the slide removed,
• 9 is a sectional view taken along the line IX-IX of FIG. 2,
• 10 shows a longitudinal section along the line XX from FIG. 11 at the level of the slide through the inner tube and outer tube, through the guide body, the clamping bodies and the locking element in its locking position,
• 11 shows a section along the line XI-XI of FIG. 12,
• 12 shows a section along the line XII-XII of FIG. 11,
• 13 is a cross-sectional view corresponding to FIG. 10, but with a slide which has already been displaced to the left in the direction of the arrow in the plane of the drawing, whereby the locking element is raised from its locking position, but both clamping bodies still engage in their recesses in the inner tube at full depth,
• 14 is a cross-sectional view corresponding to the view of FIG. 13, but with the slide displaced further to the left in the direction of the drawing plane, as a result of which the locking element is raised to its highest stroke-unlocking position and the right-hand locking body is pushed up out of its locking position along its inclined sliding plane,
• 15 is a cross-sectional view corresponding to FIG. 14, but with the slide still shifted to the left in the plane of the drawing, as a result of which the second left clamping body has also been pushed up against its gravity against its inclined sliding plane and, like the first clamping body, rests on the outside of the inner tube,
• 16 is a cross-sectional view corresponding to FIG. 13, but with a slide displaced to the right in the plane of the drawing, as a result of which the locking element is raised again from its locking position,
• FIG. 17 shows a cross-sectional view corresponding to FIG. 16, but with in the plane of the drawing slide moved further to the right, whereby the locking left clamping body is pushed upwards out of its inclined sliding plane into its unlocked position,
• 18 is a further cross-sectional view corresponding to FIG. 17, the slide being shifted even further to the right in the plane of the drawing and as a result the second right clamping body on its inclined sliding plane has also been shifted upward against its force of gravity and touches down on the outside of the inner tube,
• 19 shows a longitudinal section along the line XIX-XIX from FIG. 20 at the level of the push button through the inner tube and outer tube, through the guide body, through the clamping body and the locking element in its locked position,
• 20 shows the sectional view along the line XX-XX of FIG. 19,
• FIG. 21 shows a sectional view corresponding to FIG. 19, but with the push button pressed in and thereby the locking element and the clamping bodies completely raised via the lever and out of their latching depressions, FIG.
• 22 is a sectional view corresponding to FIG. 21, but after the inner tube has been inserted into the outer tube,
• 23 shows the sectional view along the line XXIII-XXIII of FIG. 24 through a second embodiment at the level of the push button through the inner tube and the outer tube, through the guide body, through the clamping body and the locking element in their locking position,
• 24 shows the top view along the line XXIV-XXIV of FIG. 23,
• 25 shows the offset sectional view along the line XXV-XXV of FIG. 24 with the two two-armed levers,
• FIG. 26 is a sectional view corresponding to FIG. 23, but after the push button has been pressed in and thereby the locking element with the clamping bodies raised from the latching recesses by means of the two two-armed levers,
• 27 is a sectional view corresponding to FIG. 26, but with the inner tube pulled out to the left in the plane of the drawing,
• 28 is a sectional view corresponding to FIG. 26, but with the inner tube inserted to the right in the plane of the drawing,
• 29 shows the sectional view along the line XXIII-XXIII from FIG. 24 of a further embodiment modified compared to FIGS. 23 to 28 at the level of the push button through the inner tube and the outer tube, through the guide body, through the clamping bodies and the locking element in their locking position,
• 30 shows the sectional view of FIG. 29 with the push button pressed in and the unlocking position of the clamping bodies caused thereby,
• 31 shows a longitudinal section through the inner tube and the outer tube of a third embodiment at the level of the push button, through the guide body, through the clamping body and the locking element in their locking position,
• 32 is a sectional view corresponding to FIG. 29, but with the locking element and the clamping bodies in a raised position,
• FIG. 33 is a sectional view corresponding to FIG. 30, but with the inner tube and extended to the left in the plane of the drawing
• 34 shows a sectional view corresponding to FIG. 30, but with the inner tube pushed further to the right in the plane of the drawing.

According to FIGS. 1, 2 and 2a, the telescopic vacuum cleaner suction pipe 1 consists of an outer pipe 2, an inner pipe 3 with locking recesses 4, a guide body 5, a slide 6, a locking spring 7 and a plastic circular cylinder 8 which is between the outer pipe 2 and the inner tube 3 and is rotatably coupled to the outer tube 2 via a locking cam 30. To prevent rotation, the inner tube 3 according to FIG. 2a is provided with an axial groove 10 running parallel to its longitudinal axis 9, into which a locking bar 11 of the plastic circular cylinder 8 engages in a form-fitting manner.

In all drawing figures, the longitudinal axis 9 of the inner tube 3 is identical to the longitudinal axis of the outer tube 2, since the two tubes 2, 3 are joined together concentrically. According to the invention, the locking elements consist of two at an opposite acute angle α, β with respect to the longitudinal axis 9 of the outer tube 2 on an inclined sliding plane 12, 13 of the guide body displaceably inserted into a recess 2a of the outer tube 2 and engaging in separate locking recesses 4, clamping bodies 14, 15.

According to Figures 1 and 3 to 6, the two inclined planes 12, 13 of the guide body 5 are provided with a recess 16 into which the locking spring 7 is guided parallel to the longitudinal axis 9. The locking spring 7 is supported with its one end 7a on the clamping body 14 and with its other end 7b on the clamping body 15.

In the present case, the clamping bodies 14, 15 have a platelet shape and are rounded off in a semicircle at their two ends. However, they can also be provided with a wedge shape and at their ends 14a, 15a facing the locking recesses 4 with a flat end, e.g. oval, rounded, trapezoidal or wedge-shaped cross-sectional shape.

As can be seen most clearly from FIG. 2, the clamping bodies 14, 15 are provided at their ends 14b, 15b facing away from the locking recesses 4 with lateral projections 17, 18 which form a form-fitting sliding coupling with corresponding recesses in the slide 6. A kinematic reversal is also possible such that lateral recesses are arranged in the ends 14b, 15b of the clamping bodies 14, 15, which cooperate with corresponding projections of the slide 6 and form the form-fitting sliding clutch.

Upon coupling engagement of the projections 17, 18 of the clamping body 14, 15 to be lifted from its clamping position with the slide 6, the projections 17, 18 of the respective other clamping body 14, 15 in the slide 6 are provided with a freewheel in the direction of thrust of the first clamping body 14, 15 .

As can be seen from FIG. 1, the acute angles α, β of the inclined sliding planes 14, 15 with respect to the longitudinal axis 9 of the outer tube 2 and the inner tube 3 are each 45 °.

The pressure-loaded locking spring 7 is designed as a cylindrical coil spring in the case shown. However, other spring shapes also come, e.g. a correspondingly shaped leaf spring or a double-sided conical spring, even a rubber spring in question.

The guide body 5 is provided on its two longitudinal sides 5a, 5b with latching grooves into which the longitudinal edges 2b, 2c of the recess 2a of the outer tube 2 engage in a form-fitting manner, while the guide body 5 with its two narrow sides 5c, 5d entirely or partially on the associated narrow edges 2d, 2e of the recess 2a of the outer tube 2 abuts. However, it is also possible to design the guide body 5 as a guide body 5 which can be clipped into the recess 2a in the outer tube 2 in that it has 5a-5d in its peripheral edges is provided in whole or in part with recesses for positive and / or non-positive locking.

Furthermore, the guide body 5 is provided on its part 19 which extends through the recess 2a in the outer tube 2 (see FIG. 1) with a concave contact surface 20 on the outer surface of the inner tube 3 and has a small thickness which is approximately equal to the difference in the tube inner radius 21 of the outer tube 2 and the tube outer radius 22 of the inner tube 3 plus a slight play of a sliding fit. The thickness of the plastic circular cylinder 8 is similar.

According to FIGS. 1 and 2, after the use of the guide body 5 in the recess 2a of the outer tube 2 and after the use of the clamping bodies 14, 15 and the locking spring 7, the slide 6 covering the recess 2a on all sides is positively and / or non-positively and relatively displaceable can be clipped onto the guide body 5 or arranged displaceably thereon by means of a guide screw or a pin. In any case, the guide body 5 is non-rotatably and relatively immovably in the recess 2a of the outer tube 2, whereas the slide 6 has to be displaceably arranged to move the clamping bodies 14, 15. The clamp bodies 14, 15, the guide body 5 and the slide 6 are made of plastic for low-friction and maintenance-free displaceability.

According to the invention, the clamping bodies 14, 15 are designed such that one of them 14 or 15 in the event of a relative pressure or pulling of the outer tube 2 to the inner tube 3 and vice versa thereby like a wedge in a progressively increasing, largely independent of the pressure effect of the locking spring 7 Clamping position is pullable. This principle of locking can also be called automatic self-locking.

To release the locking position of the outer tube 2 with the inner tube 3, the respectively locking clamping body 14 or 15 can be raised via the slide 6 out of a locking recess 4 along its inclined sliding plane 12, 13 against the force of the locking spring 7 on the outer circumferential line 23 of the inner tube 3, while in the following relative movement from outer tube 2 to inner tube 3, the other clamping body 14 or 15 can also be pushed up against the force of the locking spring 7 onto the outer circumferential line 23 of the inner tube 3 via the rising surface 4a of its locking recess 4.

The function of the new vacuum cleaner suction pipe 1 and its locking device is described in the following with reference to FIGS. 3 to 9, parts which correspond to FIGS. 1, 2 and 2a being always designated with the same reference numerals.

Starting from FIG. 1, the slide 6 according to FIG. 3 is shifted to the right in the direction of the arrow 6a in order to be able to pull the outer tube 2 and the inner tube 3 apart relative to one another in the direction of the arrows 24. In this case, the clamping body 14 is gripped at its projections 17 at the end 14b by the recesses of the slide 6, which are not designated, and the oblique sliding plane 12 is pushed upwards against the force of the spring 7 in the direction of arrow 25 until its lower, rounded end 14a has reached the outer circumferential line 23 of the inner tube 3. At this moment, the inner tube 3 is unlocked from the outer tube 2 and can be pulled apart in the direction of the arrows 24. When the outer tube 2 is displaced relative to the inner tube 3 by means of the slide 6 according to FIGS. 3 and 4, the end of the clamping body 14 is on the outer circumferential line 23 of the inner tube 3, while the other clamping body 15 is on the rising surface 4a of the locking recess 4 is pushed up against the force of the spring 7 in the direction of the arrow 26 until it also touches down on the outer circumferential line 23 of the inner tube 3 according to FIG. 4. With the further relative displacement from the outer tube 2 to the inner tube 3, the two clamping bodies 14, 15 engage again in the closest, passing locking recesses 4 under the action of the locking spring 7, so that a locking position corresponding to position 1 is then reached again.

Fig. 7 shows the top view of Fig. 4. As can be seen from it, the two ends 14a and 15a of the clamping body 14, 15 are in a raised position compared to Fig. 2 under the action of the strongly compressed locking spring 7, so that the latching recesses 4 located below them are displaced in the inner tube 3 relative to the outer tube 2. In the above-described unlocking of the clamping body 14 by means of the slide 6, the end 15b with its projections 18 of the other clamping body 15 is provided with a free-wheeling mechanism, not shown, in the slide 6, so that it is free from obstacles due to the relative displacement of the outer tube 2 to the inner tube 3 on the surface 4a of the recess 4 can slide up.

In the above-described pull-out position of the tubes 2, 3 in the direction of the arrows 24, the slide 6 is also displaced in the pulling direction 6a, e.g. using the thumb of the operating hand.

Conversely, if the inner tube 3 is to be inserted into the outer tube 2 according to the arrows 27, the slide 6 according to FIG. 5 is displaced in the direction of the arrow 6b until it engages the projections 18 at the end 15b of the right clamping body 15 and thereby displaces the clamping body 15 on its inclined sliding plane 13 in the direction of arrow 26 until the other end 15a the outer circumferential line 23 of the inner tube 3 touches down. This movement of the clamping body 15 also takes place counter to the action of the locking spring 7. If the inner tube 3 is now pushed into the outer tube 2 in the direction of the arrows 27, the clamping body 14 is pressed in the direction of the arrow 25 by the rising surface 4a of its locking recess 4, until its lower end 14a also touches down on the outer circumferential line 23 of the inner tube 3. This position corresponds to FIG. 6.

The top view of FIG. 6 can be seen from FIG. 8. Here, too, it can be clearly seen that the locking spring 7 is compressed relative to its position in FIG. 1, but only slightly, since the displacement paths of the two clamping bodies 14, 15 are only very small. As a result, the force to be exerted by the operator on the slide 6 is also very low. Furthermore, the slide 6 is actuated here in an ergonomically favorable manner, for example by means of the thumb of the operating hand in the direction of insertion of the arrows 27. Accordingly, a low spring hardness is sufficient for the function of the locking spring 7 and can therefore be designed as a relatively soft spring. Because their only function, in contrast to the prior art, is to move the two clamping bodies 14, 15 into a locking recess 4, so that their lower end 14a, 15a fills this locking recess 4. The actual locking action in the form of the self-locking clamping action according to the invention of the clamping bodies 14, 15 takes place however by the self-clamping effect due to a relative displacement of the outer tube 2 to the inner tube 3 or vice versa.

If, for example, the outer tube 2 and the inner tube 3 are pulled apart in the direction of the arrows 24 without actuating the slide 6 according to FIGS. 1, 3 and 4, the frictional forces exerted on the clamping body 14 via the outer tube 2 with the force in its recess 2a Guide body 5 on the one hand and the surface 4a of the locking recess 4 of the inner tube 3 on the other hand exerted a clamping force on the clamping body 14, which tries to pull it in the opposite direction of the arrow 25 between the two tubes 2, 3. Since the clamping forces thereby continue to increase progressively, even in the case of shock-like tensile loads in the direction of the arrows 24, an unwanted relative displacement of the outer tube 2 to the inner tube 3 is impossible. The hardness and the preload of the locking spring 7 do not have the slightest influence on this self-locking clamping effect.

Conversely, if an abrupt pressure load is exerted on the inner tube 3 and the outer tube 2 in the direction of the arrows 27 in FIGS. 1, 5 and 6, the right clamping body 15 is subjected to the friction forces exerted on the outer tube 2 by the guide body 5 and the friction forces from the surface 4a of the recess 4 of the inner tube 3, on the other hand, is clamped in such a self-locking manner that it is drawn into an even lower position of an imaginary gap between the outer tube 2 and the inner tube 3. In this case, the other clamping body 14 does not take part in this clamping action. The locking spring 7 does not have the slightest influence on this self-locking clamping effect. The respective locking positions can only be canceled in that the respectively locking clamping body 14 or 15 is gripped by the slide 6 at its projections 17 or 18 and moved in its respective displacement direction according to the arrows 25 or 26 and along its respective inclined sliding plane 12, 13 from the Locking recess 4 is raised.

FIG. 9 shows the section along the line IX-IX of FIG. 2, in which the projections 17, 18, which are circular in cross section in the manner of a pivot axis, are clearly recognizable at the upper end 14b, 15b of the clamping bodies 14, 15. It can also be seen that the inclined planes 12, 13 are interrupted in their central region to form the recess 16 for the use of the locking spring 7 and this 7 is partially encompassed by the side walls 28, 29 (see also FIG. 8). The longitudinal side 5b of the guide body 5 can also be seen.

According to FIGS. 10 to 12, there is the telescopic one according to a second embodiment of the invention Vacuum cleaner suction tube 101 comprising an outer tube 102, an inner tube 103 with locking recesses 104, a guide body 105, a slide 106 and a plastic circular cylinder 108, which is arranged between the outer tube 102 and the inner tube 103 and rotatably connected to the outer tube 102 via a locking cam 130 is coupled. To prevent rotation, the inner tube 103 according to FIG. 10 is provided with an axial groove 110 running parallel to its longitudinal axis 109, into which a not shown locking bar of the plastic circular cylinder 108 engages in a form-fitting manner.

In all drawing figures, the longitudinal axis 109 of the inner tube 103 is identical to the longitudinal axis of the outer tube 102, since the two tubes 102, 103 are joined together concentrically. The latching element consists of two at an opposite acute angle α, β relative to the longitudinal axis 109 of the outer tube 102 on an inclined sliding plane 112, 113 of the guide body 105 which can be displaced in a recess 102a of the outer tube 102 and engages in separate latching depressions 104 of the inner tube 103 Clamps 114, 115.

According to FIGS. 10 to 12, in the locked position, the clamping bodies 114, 115 engage with a spacing A in the intermediate space 116 above their inclined sliding plane 112, 113 under the action of the two locking springs 107, a locking element 111 which 11 and 12 on two opposite sides perpendicular to the direction of the arrows 135, 136 of the slide 106 with two extensions 117, 118 each in a side view V-shaped slot guide 119 (see FIG. 12) of the slide 106 . As can be seen from FIG. 10 in connection with FIGS. 11 and 12, the slide 106 first raises the locking element 111 along the V-shaped slot guide 119 from the intermediate space 116 and then the respective locking body either 114 or 115 along it inclined sliding plane pushed up either 112 or 113 from its locked position. When the slide 106 is not actuated, on the other hand, under the action of the two locking springs 107 according to FIG. 11, the respective clamping element either 114 or 115 pushed up into its locking position and then the locking element 111 can be pushed back into the intermediate space 116 at a distance A.

The extensions 117, 118 of the locking element 111 protrude at a very small distance a into the inside recess 120 of the V-shaped slot guide 119 of the slide 106, the stop edges 121, 122 of FIGS. 11 and 12 of which can be removed from the respective one when the slide 106 is not actuated Extension 117, 118 have approximately the same, extremely small distance a. This small distance a ensures that at a pushing movement of the slide 106 immediately after overcoming the distance a with the lifting of the locking element 111 from its locking position and this is raised so far from the gap 116 that with a further forward stroke of the slide 106 in the same direction that the respective relative movement of the outer tube 102 locking body 114, 115 blocking inner tube 103 can be pushed out of its locking recess 104 by slide 106.

As can be seen most clearly from FIGS. 10 and 13, the locking element 111 is provided with a T-shaped cross-sectional shape in a section perpendicular to the direction of advance of the slide 106, the vertical web 123 of which is guided in a vertical slot 124 of the guide body 105 and the one with the angled ends 125, 126 of its transverse web 127 engage in a recess 128 of the guide body 105, on which the end faces 129, 131 of the two clamping bodies 114, 115 directly adjoin or rest and are therefore excluded from a possibility of displacement.

11, the locking element 111 is provided with a cross shape in its top view and with its transverse web 127, which is rectangular in plan view, is fitted into a rectangular recess 132 of the guide body 105 with little play.

Furthermore, each clamping body 114, 115 is guided on its upper side with a projection 133, 134 in a rectilinear slot 137 of the guide body 105 which runs in the pushing direction of the slide 106 according to the arrows 135, 136. Each projection 133, 134 is pushed up by a push extension 138, 139 of the slide 106 engaging in the same slot 137 along its inclined plane 112, 113 as soon as the front end of this push extension 138, 139 engages behind the end face of the projection 133, 134 facing it. The distance B between the front end of the push extension 138, 139 and the facing end side of the projection 133, 134 is considerably larger than the distance a between the extensions 117, 118 and the stop edges 121, 122.

11, the locking spring consists of two locking springs 107, each of which is supported with its one end 107a against a surface 140, 141 of the slide 106 and with its other end 107b against a surface 142, 143 of the guide body 105. The locking springs 107 each consist of a cylindrical helical spring or a conical spring, which are guided or held in a partially cylindrical recess 144, 145 of the guide body 105.

The mode of operation of the locking element 111 in connection with the clamping bodies 114, 115 is as follows described with reference to FIGS. 14 to 18, parts corresponding to FIGS. 10 to 13 being designated with the same reference numerals.

In order to be able to insert the inner tube 103 into the outer tube 102, starting from FIG. 10, the clamping body 115 counteracting this insertion movement must be pushed up on its sliding plane 113, because otherwise it would be carried along by the inner tube 103 in its locking recess 104 and like a wedge with an automatically self-clamping effect would be drawn into the gap 146 (see FIGS. 10 and 14) between the outer tube 102 and the inner tube 103.

However, before the clamping body 115 can be pushed up on its inclined sliding plane 113, the locking element 111 must be raised from the position shown in FIG. 10 to the position shown in FIG. 13. In order to achieve this lift, the slide 106 is moved in the direction of the arrow 135. With this feed, both extensions 117, 118 of the locking element 111, after having overcome the extremely small distance a on the inclined plane 119b of the V-shaped slot guide 119 in the slide 106, are gripped by the stop edge 122 of the slide 106 and on the inclined plane 119a of the V- shaped slot guide 119 raised until it has reached its raised position shown in FIG. 13. During this lifting process, the locking element 111 with its Vertical web 102 guided into the vertical slot 124 of the guide body 105.

As can be seen from FIG. 13, the two clamping bodies 114, 115 are freely displaceable in this position because their end faces 129, 131 are no longer blocked by the angled ends 125, 126 of the transverse web 127 of the locking element 111 from moving in the recess 128 will. In this raised position of FIG. 13, when the slide 106 moves further in the direction of arrow 135, its push extension 139 engages behind the projection 134 of the clamping body 115, so that it extends on its inclined sliding plane 113 at an angle β to the longitudinal axis 109 of the outer tube 102 its recess 104 is pushed out. In the pushed-up position, the clamping body 115 assumes the position shown in FIG. 14, in which position the locking element 111 has also reached its end position.

14, the inner tube 103 can be pushed into the outer tube 102. During this insertion movement, the other clamping body 114 is only pushed up from the surface 104a of the latching element 104 on its inclined sliding plane 112 at the angle α to the longitudinal axis 109 in the opposite direction of its gravity and thus with low friction until it has assumed its position shown in FIG. 15 and as before of the The lower end of clamp body 115 is placed on surface 103a of inner tube 103. Now, when holding the slide 106 in this position, the inner tube 103 with the desired length can be inserted into the outer tube 102. If an insertion is only to be made up to the next latching recess 104, only the slide 106 needs to be released and the inner tube 103 must be slowly moved further. After this release, the two locking springs 107 endeavor to move the slide 106 into its central position shown in FIG. 11. However, they are prevented from doing so by the position of the two clamping bodies 114, 115 in connection with the locking element 111. However, as soon as the corresponding latching depressions 104 for the two clamping bodies 114, 115 have been reached, the slide 106 presses the extensions 117, 118 into a lower position with the action of the locking springs 107 with its V-shaped slot guide 119, the locking element 111 with its vertical web 123 slides downward in the vertical slot 124 of the guide body 105 and, during this downward movement, with its angled ends 125, 126 of its transverse web 127, it also pushes the clamping bodies 114, 115 back downward into their respective latching depressions 104 along their inclined sliding planes 112, 113. In the central position of the slide 106 according to FIG. 11, the locking element 111, with its angled ends 125, 126, blocks the clamping bodies 114, 115 from moving upward, so that in In this position, the inner tube 103 is locked again to the outer tube 102.

If, on the other hand, the inner tube 103 is to be pulled out of the outer tube 102, the slide 106 is displaced in accordance with FIGS. 16 to 18 by means of the corresponding thumb of the operating hand in the direction of the arrow 136. In accordance with FIGS Thrust extension 138 of the slide 106 gripped the end face of the projection 133 of the clamping body 114 facing it after the locking element 111 had already been raised by the slide 106 via its extensions 117, 118 in the slot 119b of the V-shaped slot guide 119 in accordance with the position in FIG. 16 is. In this position, the path for feeding both clamping bodies 114, 115 is free. When the slide 106 is moved further in the direction of the arrow 136 from its position shown in FIG. 16 to the position shown in FIG. 17, the locking element 111 is raised into its end position shown in FIG. 17 and the clamping body 114 is removed from the push extension 138 of the Slide 106 on its projection 133 within the slot 137 along its inclined sliding plane 112 at an angle α out of its recess 104. The inner tube 103 can now be pulled out of the outer tube 102. When this is pulled out, the clamping body 115 is now also removed from the surface 104a of the locking recess 104 Raised with little friction along its inclined sliding plane 113 at an angle β onto the outer circumferential surface 103a of the inner tube 103, as can be seen from FIG. 18. After the desired length of the pulling apart, the locking element 111 with the clamping bodies 114, 115 and then the clamping bodies 114, can then be pressed down again by releasing the slide 106 in the manner already described for FIGS. 13 to 15 by the locking springs 107 via the slide 106. 115 snap into the next latching recesses 104.

In this second embodiment of the invention, the locking springs 107 no longer act directly on the clamping bodies 114, 115, but only indirectly via the slide 106, the extensions 117, 118 and the V-shaped slot guide 119.

After reaching its end position, the locking element 111 blocks the clamping bodies 114, 115 in a purely form-locking manner with each movement in the direction of an unlocking. Since the locking springs 107 can be designed completely identically and can be provided with an identical preload, they endeavor to always hold the slide 106 in its central position shown in FIG. 11. In this middle position, the extensions 117, 118 have assumed their deepest position, shown in FIG. 12, within the V-shaped slot guide 119. In this situation, the Clamping bodies 114, 115 are held in their locking position exclusively by locking element 111. In this position, the locking springs 107 no longer take part in locking the clamping bodies 114, 115. Even when the slide 106 is displaced, the respectively compressed locking spring 107 is placed under an increased pretension, which, however, has no influence on the friction of the respective clamping bodies 114, 115. Since all positive movement sequences take place with low friction and with a positive fit, the locking springs 107 can also be provided with a flat spring characteristic, which is just sufficient to be able to hold the slide 106 in its central position shown in FIG. 11 and the friction forces occurring between the locking element 111 during its displacement and to overcome clamping bodies 114, 115 and the guide body 105.

In the second embodiment according to FIGS. 19 to 22, the telescopic vacuum cleaner suction pipe 201 consists of an outer pipe 202, an inner pipe 203 with latching recesses 204, a guide body 205, a slide 206 and a plastic circular cylinder 208, which is between the outer pipe 202 and the Inner tube 203 is arranged and coupled non-rotatably to the outer tube 202 via a locking cam 230. To prevent rotation, the inner tube 203 according to FIGS. 19, 21 and 22 has an axial groove 210 running parallel to its longitudinal axis 209 provided, in which a not shown locking bar of the plastic circular cylinder 208 engages positively.

In all drawing figures, the longitudinal axis 209 of the inner tube 203 is identical to the longitudinal axis of the outer tube 202, since both tubes 202, 203 are joined together concentrically. In these embodiments, too, the latching element consists of two at an opposite acute angle α, β with respect to the longitudinal axis 209 of the outer tube 202 on an inclined sliding plane 212, 213 of the guide body inserted in a form-fitting manner in a recess 202a of the outer tube 202 and partially placed on its outer peripheral surface 202b 205 displaceable clamping bodies 214, 215 engaging in separate locking recesses 204.

In the locked position of the clamping bodies 214, 215 according to FIG. 19, the locking element 211 engages with the distance A in the space 216 above the inclined sliding plane 212, 213 between the two clamping bodies 214, 215. This engagement takes place via a lever 217 under the action of the locking spring 207, which is supported with one end 207a against the underside 206a of the push button 206 and with its other end 207b on a shaped support dome 202c of the outer tube 202.

As can best be seen from FIG. 20, the lever 217 is designed as an essentially rectangular wire bracket with rounded corner regions. In its central region 218, the lever 217 is pivotally mounted and provided with two lever arms 217a, 217c, of which the first lever arm 217a engages with the free end 217b on the locking element 211 and of which the second lever arm 217c at its free end when the push button 206 is not actuated 217d is engaged by the locking spring 207 in the manner already described and is held in the locking position in FIG. 19.

The locking spring 207 can be designed not only as a cylindrical helical spring, but also as a conical spring or leaf spring.

The push button 206 essentially has a hat shape with an oval or circular cross section, the outer peripheral region 206b of which is guided in a recess 219 of the guide body 205 adjacent to the locking element 211, as shown in FIG. 20.

According to this first alternative embodiment according to FIGS. 19 to 22, the locking element 211 has a double-T shape in the cross-sectional view parallel to the longitudinal axis 209 of the outer tube 202, the upper cross bar 220 of which is shorter than the lower cross bar 221 19, the end faces 214a, 215a of the two clamping bodies 214, 215 directly adjoin or abut the ends of the upper crossbar 220 in the blocking position according to FIG. 19.

The ends of the lower crossbeam 221 of the locking element 211 engage under the angled upper ends 214b, 215b of the clamping bodies 214, 215 and can be lifted together with these 214, 215 by the double-armed lever 217.

If the inner tube 203 is to be unlocked from the outer tube 202, the clamping bodies 214, 215 must be lifted out of the locking recesses 204 in FIGS. 19 and 20. This is done according to Figures 21 and 22 in that the push button 206 in the direction of arrow 222 transverse to the longitudinal axis 209 of the outer tube 202 is pressed into the recess 219 of the guide body 205 with compression of the locking spring 207, whereby the lever 217 with its first lever arm 217a (see FIG. 20) pivots clockwise according to arrow 223 of FIG. 21. As a result, the locking element 211 with its upper, shorter crossbar 220 is first lifted out of the space 216 with the distance A between the two end faces 214a, 215a of the clamping bodies 214, 215 in the direction of arrow 224 until the lower, longer crossbar 221 has its ends under the angled ends 214b, 215b of the clamp bodies 214, 215 engages and pulls them up on their sliding planes 212, 213 from their locking recesses 204 in the inner tube 203 until the position shown in FIG. 21 is reached.

In this position of FIG. 21, the inner tube 203 according to FIG. 22 can both be pushed into the outer tube 202 in the direction of the arrow 225 and can be pulled out of the outer tube 202 in the opposite direction of the arrow 225. Since the inner tube 203 can be displaced relative to the outer tube 202 in both telescopic directions without the clamping bodies 214, 215 being exposed to any spring-loaded friction forces on the outer circumferential surface 203a of the inner tube 203, the relative displacement takes place with very little friction and without even snapping over even one clamping body 214, 215 .

If the clamping bodies 214, 215 are to snap into the nearest latching recesses 204, all that is needed is to release the push button 206 during the displacement, so that the locking spring 207 can unfold its action again and thus, when the next latching recess of the lever 217 is reached, under the action of the locking spring 207 presses the locking element 211 and the clamping bodies 214, 215 which are positively coupled to it via the upper crossbeam 220 into these locking recesses 204 until the locking position shown in FIG. 19 is reached again.

FIGS. 23 to 27 show a further embodiment of a push-button principle, the locking element 211 with its double-T shape and with the upper crossbar 220 and the lower crossbar 221 and the two clamping bodies 214, 215 with their angled ends 214b, 215b and rests with its end faces 214a, 215a on the shorter upper crossbeam 220 and corresponds to the first embodiment according to FIGS. 19 to 22. Otherwise, parts which correspond to FIGS. 19 to 22 are identified by the same reference numbers.

In contrast to the exemplary embodiment of FIGS. 19 to 22, in this further embodiment the lever 217 is now composed of two two-armed levers 226, 227, as can best be seen from FIGS. 24 and 25. The two levers 226, 227 are pivotally mounted opposite one another in the guide body 205 on pivot axes 228, 229 and engage on two opposite sides on the locking element 211 with the ends 226b, 227b of their first lever arms 226a, 227a, whereas they engage on the free ends 226d, 227d their second lever arms 226c, 227c each rest on a projection 231 on the underside 206a of the push button 206, as can best be seen from FIGS. 23 and 26 to 28.

As can also be seen from FIGS. 25 to 28, the push button 206 has on its underside 206a in its central region a guide pin 232 which is encompassed concentrically by the locking spring 207 which is designed as a cylindrical helical spring and which has one end 207a against the underside 206a of the push button 206 and with its other end 207b in a central blind hole 211a of the locking element 211 for receiving both the coil spring 207 and the guide pin 232.

In the locked position of the clamping bodies 214, 215 according to FIG. 23, the locking spring 207 holds the push button 206 in the raised position and the locking element 211 in the lowered position.

In contrast, in the unlocked position of FIGS. 25 to 28, the push button 206 presses down the free ends 226d, 227d of the second lever arms 226c, 227c of the two double-arm levers 226, 227 against the pressure action of the locking spring 207, while at the same time the ends 226b, 227b of the first lever arms 226a, 227a according to FIG. 25, likewise counteract the action of the locking spring 207, and together with the clamping bodies 214, 215, lift the locking element 211 into the unlocking position in the direction of the arrows 224. This is done in that the two levers 226, 227 about their pivot axes 228, 229 according to FIG. 25 in the direction of Swivel arrows 233, 234. First, the upper, shorter crossbeam 220 of the locking element 211 is lifted upward from the space 216 with the distance A in the direction of arrow 224, so that after a certain stroke h the ends of the lower, longer crossbeam 221 have the angled upper ends 214b, 215b reach under the clamping body 214, 215 for unlocking and, together with the locking element 211, are raised into the unlocking position shown in FIGS. 26 to 28.

26, which corresponds to a specific relative assignment of the inner tube 203 to the outer tube 202 of FIG. 23, the inner tube 203 can then either be pulled more out of the outer tube 202 in the direction of arrow 235 according to FIG. 27 or according to FIG. 28 be pushed further into the outer tube 202 according to the arrow 236. Since the clamping bodies 214, 215 can move freely from any spring load, in particular also the locking spring 207, during these relative displacements from inner tube 203 to outer tube 202, this relative displacement takes place with extremely little friction. As soon as the operator wishes the clamping bodies 214, 215 to be re-engaged in the nearest latching recesses 204, they only need to let go of the push button 206, so that under the action of the locking spring 207, the push button 206 is pushed upwards in the direction of arrow 224 of FIG. 23 and at the same time the locking element 211 in opposite direction is lowered. As soon as the upper crossbeam 220 has pressed the angled ends 214b, 215b of the clamping bodies 214, 215 downward during this downward movement until the latter 214, 215 slide into their locking recesses 204 and the distance A in the space 216 is reached, the upper, shorter crossbeam can 220 drive into this space 216 and lock the clamping bodies 214, 215 again positively in their locking position according to FIG. 23.

Figures 29 and 30 show a slightly modified embodiment compared to the embodiment of Figures 23 to 28. While the pivot axes 228, 229 of the levers 226, 227 in the exemplary embodiment in FIGS. 23 to 28 consist of hinge pins, in the exemplary embodiment in FIGS. 29 and 30 these are now formed by supports 228a, 229a. Furthermore, the ends 226b, 227b of the first lever arms 226a, 227a in the exemplary embodiment of FIGS. 23 to 28 (see in particular FIG. 25) are articulatedly coupled to the locking element 211 via articulated pins. In contrast, the ends 226b, 227b of the first lever arms 226a, 227a in the exemplary embodiment of FIGS. 29 and 30 are now articulated via film hinges 246 with the locking element 211, which extend over the entire width of the lever ends 226b, 227b.

In the exemplary embodiments of FIGS. 23 to 28 on the one hand and FIGS. 29 and 30 on the other hand, the push button 206 has a hat shape with an oval or circular cross section, the outer peripheral region 206b of which is guided in a form-fitting manner in a recess 247 of the guide body 205 and the one circumferential web 248 of the guide body 205 engages with a support ring 249 which is hook-shaped in cross section. As a result, the push button 206 is always securely guided and held in the guide body 205.

In the third exemplary embodiment according to FIGS. 31 to 34, the locking element 211 is wedge-shaped, the front ends 214a, 215a of the two clamping bodies 214, 215 directly abut its upper end 211b in the blocking position according to FIG. 31. Its lower region 211c is provided with a coupling pin 237 which, according to FIG. 31, engages in an elongated hole 238, 239 of each clamping body 214, 215 with a lifting clearance (H _s ). 32, the locking element 211 is connected on its upper side 211b to the end 240b of a first lever arm 240a of a double-armed lever 240 mounted in the guide body 205 with a pivot axis 241, the second lever arm 240c of which is at the same time acting under the action of a locking spring 207 designed as a leaf spring forms the push button 206.

In order to raise the clamping bodies 214, 215 from the locking position shown in FIG. 31, a pressure force is carried out by the operator transversely to the longitudinal axis 209 of the outer tube 202 on the second lever arm 240c designed as a push button 206 in the direction of the arrow 242 of FIG. 31, as a result of which the double-armed lever 240 is pivoted about its pivot axis 241 in the clockwise direction of the arrow 243 and, contrary to the action of the locking spring 207, the wedge-shaped locking element 211 is first lifted out of its locked position and then after the lifting clearance (H _s ) has been overcome and thus the clamping bodies 214, 215 are delayed Coupling pin 237 can also be taken along and raised. As soon as the unlocking position of the locking element 211 and the clamping bodies 214, 215 shown in FIGS. 32 to 34 has been reached, the clamping bodies 214, 215 are completely raised out of their latching depressions 204.

According to this, the inner tube 203 can either be pulled further out of the outer tube 202 according to the arrow 235 of FIG. 33 or pushed further into the inner tube 203 according to the arrow 236 of FIG. 34. As soon as a new locking is desired, it is only necessary to release the lever arm 240c in the form of a push button 206, whereupon the lever 240 swivels counterclockwise under the action of the locking spring 207 in the counterclockwise direction 243 and thereby presses down the locking element 211. With this The two clamping bodies 214, 215 are also taken down by the upper end 211b of the locking element 211 and also pressed down. As soon as the clamping bodies 214, 215 assume their lowest position in the new locking recesses 204, the locking element 211 can slide with its upper end 211b into the newly formed intermediate space 216 at a distance A until the end faces 214a, 215a of the two clamping bodies 214, 215 immediately rest on the upper end 211b of the locking element 211 (see FIG. 31). In this position, the coupling pin 237 has once again assumed its lowest position within the elongated holes 238, 239.

As can furthermore be seen from all of FIGS. 31 to 34, the first lever arm 240a, the guide body 205, the locking body 211 and the clamping bodies 214, 215 are covered by a housing 244 which is in a slot 245 from the second lever arm which is bent at an angle upwards 240c is penetrated in the vicinity of the pivot axis 241. In the illustrated case, this second lever arm 240c, which at the same time forms the push button 206, is gripped by a leaf spring as a locking spring 207. It goes without saying that this leaf spring can also be replaced by a cylindrical coil spring or conical spring.

Claims (41)

Telescopic vacuum cleaner suction tube with an outer tube and an inner tube with locking recesses, into which engages a locking element which couples the outer tube and can be unlocked via a manually operated slide, which is held in its locked position by a pressure-loaded locking spring when the slide is not actuated and counteract the force when the slide is actuated the locking spring can be moved to a relative displacement of the inner tube and outer tube into its unlocking position, characterized in that the latching element consists of two at an opposite acute angle (α, β) with respect to the longitudinal axis (9) of the outer tube (2) on an inclined sliding plane ( 12, 13) of a guide body (5), which can be slid into a recess (2a) of the outer tube (2) and which engages in separate latching recesses (4), of which the respective relative movement from the inside (3 ) to the outer tube (2) e clamping body (14, 15) to release this locking position on the slide (6) from its locking recess (4) along its inclined sliding plane (12, 13) is displaceable. Vacuum cleaner suction pipe according to claim 1, characterized in that the clamping bodies (14, 15) are designed such that one of them (14 or 15) when the outer pipe (2) is pressed or pulled relative to the inner pipe (3) and conversely, as a wedge in a progressively rising, largely independent of the pressure of the locking spring (7) clamping position can be pulled. Vacuum cleaner suction pipe according to claim 1 and 2, characterized in that to release the blocking position of the outer pipe (2) with the inner pipe (3) the blocking clamping body (14 or 15) along the slide (6) from its locking recess (4) along Its inclined sliding plane (12, 13) can be raised against the force of the locking spring (7) on the outer circumferential line (23) of the inner tube (3), while in the subsequent relative movement from outer tube (2) to inner tube (3) the other clamping body (14 or 15) can also be pushed up against the force of the locking spring (7) onto the outer circumferential line (23) of the inner tube (3) via the rising surface (4a) of its locking recess (4). Vacuum cleaner suction pipe according to one or more of claims 1 to 3, characterized in that the clamping bodies (14, 15) have a plate or wedge shape. Vacuum cleaner suction pipe according to one or more of claims 1 to 4, characterized in that the clamping bodies (14, 15) at their ends (14a, 15a) facing the locking recesses (4) have a flat, rounded end, a trapezoidal or a wedge-shaped one Cross-sectional shape are provided. Vacuum cleaner suction pipe according to one or more of Claims 1 to 5, characterized in that the clamping bodies (14, 15) are provided with lateral projections (17, 18) at their ends (14b, 15b) facing away from the latching recesses (4), which form a positive sliding coupling with corresponding recesses in the slide (6). Vacuum cleaner suction pipe according to claim 6, characterized in that when the projections (17, 18) of the clamping body (14, 15) to be raised from its clamping position with the slide (6) engage the projections of the other clamping body (14, 15) in the slide ( 6) are provided with a freewheel in the direction of thrust of the first clamping body (14, 15). Vacuum cleaner suction pipe according to one or more of claims 1 to 7, characterized in that the two oblique sliding planes (12, 13) arranged at an opposite, acute angle (α, β) in the guide body (5) for use on both clamping bodies (14, 15) simultaneously acting locking spring (7) are provided with a recess (16). Vacuum cleaner suction pipe according to one or more of claims 1 to 8, characterized in that the two acute angles (α, β) of the two inclined sliding planes (12, 13) with respect to the longitudinal axis (9) of the outer pipe (2) are of the same size. Vacuum cleaner suction pipe according to one or more of claims 1 to 9, characterized in that the acute angles (α, β) of the inclined sliding planes (12, 13) with respect to the longitudinal axis (9) of the outer pipe (2) each amount to 45 °. Vacuum cleaner suction pipe according to one or more of Claims 1 to 10, characterized in that the pressure-loaded locking spring (7) consists of a cylindrical coil spring, a correspondingly shaped leaf spring or a double-sided conical spring or an entropy-elastic spring. Vacuum cleaner suction pipe according to one or more of Claims 1 to 11, characterized in that the guide body (5) has latching grooves on its two longitudinal sides (5a, 5b) into which the longitudinal edges (2b, 2c) of the recess (2a) in the outer pipe (2) engage in a form-fitting manner, while the narrow sides (5c, 5d) of the guide body (5) rest completely or partially on the associated narrow edges (2d, 2e) of the recess (2a) of the outer tube (2). Vacuum cleaner suction pipe according to one or more of claims 1 to 12, characterized in that the guide body (5) for its use in the recess (2a) of the outer tube (2) in its edges (2b-2e) of the recess (2a) facing, circumferential sides (5a-5d) is provided, in whole or in part, with recesses for positive and / or non-positive locking. Vacuum cleaner suction pipe according to one or more of Claims 1 to 13, characterized in that the part (19) of the guide body (5) which extends through the recess (2a) in the outer pipe (2) and has a concave contact surface (20) on the inner pipe (3) is provided and has a small thickness, which is approximately equal to the difference between the inner tube radius (21) of the outer tube (2) and the outer tube radius (22) of the inner tube (3) plus a slight play of a sliding fit. Vacuum cleaner suction pipe according to one or more of claims 1 to 14, characterized in that after the use of the guide body (5) in the recess (2a) of the outer pipe (2) and after the use of the clamping body (14, 15) and the locking spring (7) the slide (6) covering the recess (2a) on all sides can be positively and / or non-positively and relatively displaceably clipped onto the guide body (5) or can be fastened and displaced thereon by means of a guide screw or a pin. Vacuum cleaner suction pipe according to one or more of claims 1 to 15, characterized in that the clamping bodies (14, 15), the guide body (5) and the slide (6) consist of plastic, whereas the locking spring (7) is made of spring steel or is made of an entropy-elastic material. Vacuum cleaner suction pipe according to one or more of claims 1 to 16, characterized in that, for additional protection against rotation, the inner pipe (3) is provided with an axial groove (10) running parallel to its longitudinal axis (9), in which a Locking bar (11) of a plastic circular cylinder (8) arranged between the outer tube (2) and inner tube (3), rotatably coupled to the outer tube (2), engages via a locking cam (30). Telescopic vacuum cleaner suction tube with an outer tube and an inner tube with locking recesses, into which engages a locking element that couples the outer tube and can be unlocked via a manually operated slide, which consists of two at an opposite acute angle to the longitudinal axis of the outer tube on one inclined sliding plane one in one Recess of the outer tube form-fitting inserted guide body displaceable, engaging in separate locking recesses clamping bodies, of which the respective relative movement from the inner tube to the outer tube locking body to solve this locking position can be moved out of its locking recess via the slide along its inclined sliding plane, the clamping body of one pressure-loaded locking spring is held in its locking position when the slide is not actuated and in its unlocking position when the slide is actuated against the force of the locking spring g are movable, characterized in that in the locking position of the clamping bodies (114, 115) in a remaining space (116) above their inclined sliding planes (112, 113) under the action of the locking spring (107) a locking element (111) at a distance (A ) engages positively, which on two opposite sides perpendicular to the direction of push (arrows 135, 136) of the slide (106) with two extensions (117, 118) each in a side view V-shaped slot guide (119) of the slide (106) is guided and the locking element (111) can be lifted by the slide (106) one after the other along the V-shaped slot guide (119) and then the locking clamping body (114, 115) can be pushed up out of its locking position along its inclined sliding plane (112, 113), whereas, when the slide (106) is not actuated under the action of the locking spring (107), the clamping body (114, 115) pushed up into its locking position and then the locking element (111) can be pushed back into the intermediate space (116). Vacuum cleaner suction pipe according to claim 18, characterized in that the extensions (117, 118) of the locking element (111) with a very small distance (a) into the inside recess (120) of the V-shaped slot guide (119) of the slide (106) protrude into the opposite stop edges (121, 122) of about the same, very small distance (a) from the respective extension (117, 118) when it is not actuated. Vacuum cleaner suction pipe according to claim 18 or 19, characterized in that the locking element (111) has a T-shaped cross-sectional shape, is guided with its vertical web (123) in a vertical slot (124) of the guide body (105) and with its angled ends ( 125, 126) of its transverse web (127) engages in a recess (128) of the guide body (105), on which (125, 126) the end faces (129, 131) of the clamping bodies (114, 115) directly adjoin. Vacuum cleaner suction pipe according to one or more of claims 18 to 20, characterized in that the locking element (111) is provided with a cross shape in its plan view and with its transverse web (127) which is rectangular in plan view, with little play in a rectangular recess (132) of the guide body (105) is fitted. Vacuum cleaner suction pipe according to one or more of claims 18 to 21, characterized in that each clamping body (114, 115) on its upper side with a projection (133, 134) in a straight line in the direction of thrust (arrows 135, 136) of the slide (106) extending slot (137) of the guide body (105) and can be pushed up by a push extension (138, 139) of the slide (106) engaging in the same slot (137) along the inclined sliding plane (112, 113). Vacuum cleaner suction pipe according to one or more of claims 18 to 22, characterized in that the locking spring consists of two locking springs (107), each of which with one end (107a) against a surface (140, 141) of the slide ( 106) and with its other end (107b) against a surface (142, 143) of the guide body (105). Vacuum cleaner suction pipe according to claim 23, characterized in that the locking springs (107) each consist of a cylindrical coil spring or conical spring, which are guided in a partially cylindrical recess (144, 145) of the guide body (105). Telescopic vacuum cleaner suction tube with an outer tube and an inner tube with locking recesses, into which engages a locking element that couples the outer tube and can be unlocked via a manually operated slide, which consists of two at an opposite acute angle to the longitudinal axis of the outer tube on one inclined sliding plane one in one Recess of the outer tube form-fitting inserted guide body displaceable, engaging in separate locking recesses clamping bodies, of which the respective relative movement from the inner tube to the outer tube locking body to solve this locking position can be moved out of its locking recess via the slide along its inclined sliding plane, the clamping body of one pressure-loaded locking spring is held in its locking position when the slide is not actuated and in its unlocking position when the slide is actuated against the force of the locking spring g are movable, characterized in that in the locking position of the clamping bodies (214, 215) in a remaining space (216) above their inclined sliding planes (212, 213) a locking element (211) engages in a form-fitting manner, which crosswise to the longitudinal axis (209) of the Outer tube (202) via a lever (217; 226, 227; 240) by a slide which can be moved in the same direction, is designed as a push button (206, 240c) and is acted upon by the locking spring (207) together with the clamping bodies (214, 215) can be raised into an unlocking position. Vacuum cleaner suction pipe according to claim 25, characterized in that the locking element (211) in cross-sectional view parallel to the longitudinal axis (209) of the outer pipe (202) has a double-T shape, the upper crossbar (220) shorter than the lower crossbar ( 221) is formed and the ends (214a, 215a) of the clamping bodies (214, 215) directly adjoin the ends in the blocking position. Vacuum cleaner suction pipe according to claim 26, characterized in that the lower crossbeam (221) of the locking element (211) engages under the angled upper ends (214b, 215b) of the clamping bodies (214, 215) for unlocking and together with these (214, 215) can be raised by the double-armed lever (217; 226, 227). Vacuum cleaner suction pipe according to one or more of claims 25 to 27, characterized in that the locking element (211) is provided with a cross shape in its plan view and with its top cross bar (220) which is rectangular in plan view with little play in a rectangular recess in the guide body (205) fitted and guided therein. Vacuum cleaner suction pipe according to one or more of claims 25 to 28, characterized in that the lever (217) is pivotally mounted in its central region (218) in the guide body (205) and is provided with two lever arms (217a, 217c), of which the the first lever arm (217a) engages with its free end (217b) on the locking element (211) and of which the second lever arm (217c) does not actuate the push button (206) at its free end (217d) by the locking spring (207) in the locking position is held. Vacuum cleaner suction pipe according to one or more of claims 25 to 29, characterized in that the lever (217) is designed as an essentially rectangular wire bracket with rounded corner regions. Vacuum cleaner suction pipe according to one or more of claims 25 to 29, characterized in that the locking spring (207) designed as a cylindrical helical spring, conical spring or leaf spring engages with one end (207a) of the underside (206a) of the push button (206) and engages with its other end (207b) against the outer circumferential surface (202a) of the outer tube (202) on a molded support dome (202c). Vacuum cleaner suction pipe according to one or more of claims 25 to 31, characterized in that the push button (206) has a hat shape with an oval or circular cross-section, the outer peripheral region (206b) of which is form-fitting in a recess (219) adjacent to the locking element (211) Guide body (205) is guided and which engages behind a circumferential web (248) of the guide body (205) with a retaining ring (249) which is hook-shaped in cross section. Vacuum cleaner suction pipe according to one or more of claims 25 to 28, characterized in that the lever is composed of two two-armed levers (226, 227), which are each mounted opposite one another in the guide body (205) with pivot axes (228, 229) engage two opposite sides of the locking element (211) with the ends (226b, 227b) of their first lever arm (226a, 227a), whereas they have the free ends (226d, 227d) of their second lever arm (226c, 227c) on a projection (230 , 231) on the underside (206a) of the push button (206). Vacuum cleaner suction pipe according to claim 33, characterized in that the pushbutton (206) has on its underside (206a) in its central region a guide pin (232) which is encompassed concentrically by the locking spring (207) which is designed as a cylindrical helical spring and which engages with one end (207a) against the underside (206a) of the push button (206) and the other end (207b) at the bottom of a central blind hole (211a) of the locking element (211) for receiving the coil spring (207) and the guide pin (232 ) supports. Vacuum cleaner suction pipe according to claim 33 or 34, characterized in that in the locking position of the clamping body (214, 215) the locking spring (207) holds the push button (206) in the raised position and the locking element (211) in the lowered position, whereas in the unlocking position the push button (206) presses down the free ends (226d, 227d) of the second lever arms (226c, 227c) against the pressure effect of the locking spring (207), while at the same time the ends (226b, 227b) of the first lever arms (226a, 227a) press the locking element (211) against the action of the locking spring (207) together with the sprags (214, 215) in the unlocking position (arrow 224). Vacuum cleaner suction pipe according to one or more of claims 33 to 35, characterized in that the pivot axes (228, 229) of the levers (226, 227) are formed either by hinge pins or by a support (228a, 229a) and the ends (226b , 227b) of their first lever arm (226a, 227a) are coupled in an articulated manner to the locking element (211) either via hinge pins or via a film hinge (246). Vacuum cleaner suction pipe according to one or more of claims 33 to 36, characterized in that the push button (206) has a hat shape with an oval or circular cross-section, the outer peripheral region (206b) of which is guided in a form-fitting manner in a recess (247) in the guide body (205) and engages behind a circumferential web (248) of the guide body (205) with a retaining ring (249) which is hook-shaped in cross section. Vacuum cleaner suction pipe at least according to Claim 25, characterized in that the locking element (211) is wedge-shaped, at the upper end (211b) of which in the blocking position the end faces (214a, 215a) of the two clamping bodies (214, 215) lie and the lower one Area (211c) is provided with a coupling pin (237) which engages in an elongated hole (238, 239) of each clamping body (214, 215) with a stroke (H _s ). Vacuum cleaner suction pipe according to claim 38, characterized in that the locking element (211) at its upper end (211b) with the end (240b) of a first lever arm (240a) of a double-armed, mounted in the guide body (205) via a pivot axis (241) Lever (240) is connected, the second lever arm (240c) is under the action of the locking spring (207) and at the same time forms the push button (206). Vacuum cleaner suction pipe according to one of claims 38 or 39, characterized in that when the lever (240) is pivoted counter to the action of the locking spring (207), first the wedge-shaped locking element (211) from its locked position and then the clamping bodies (214, 215) due to their elongated hole (238, 239) can be raised by the coupling pin (237) with a time delay. Vacuum cleaner suction pipe according to one or more of claims 38 to 40, characterized in that the first lever arm (240a), the guide body (205), the locking body (211) and the clamping body (214, 215) are covered by a housing (244) which is penetrated in a slot (245) by the second lever arm (240c), which is angled upwards at an angle in the vicinity of its pivot axis (241) and which is undercut by the locking spring (207) designed as a leaf spring, cylindrical coil spring or conical spring .

Images