EP3088136A1 - Telescopic handle for cleaners - Google Patents

Abstract

A telescopic handle for cleaning equipment comprises an outer tube (13), a middle tube (14) and an inner tube (15), the outer tube (13) slidably sliding about the central tube (14) and the inner tube (15) in the middle tube (14) are guided; the central tube (14) having a first tube end in the outer tube (13) and a second tube end around the inner tube (15); a first deflecting roller (22) and an elongate fastening element (24) are fastened to the first tube end, wherein the elongated fastening element (24) extends in the direction of the second tube end and a second on the side remote from the first tube end of the elongate fastening element (24) Deflection pulley (28) is attached; a first pull rope (30) which is guided over the first deflection roller (22) that it changes the direction by about 180 ° and the first Zugseilende (32) on the inner tube (15) is fixed and the second Zugseilende (34) attached to the outer tube (13); and a second pull cable (36) which is guided over the second deflection roller (28) in such a way that it changes the direction by approximately 180 ° and whose first cable end (38) is fastened to the inner tube (15) and whose second cable end (40) attached to the outer tube (13), wherein the first traction cable (30) and the second traction cable (36) are arranged such that a manual displacement movement between outer pipe (13) and middle pipe (14) produces a rectified, automatic displacement movement between the middle pipe (14) and inner pipe (15 ).

Description

Field of the invention

The invention relates to a telescopic handle for cleaning equipment with an outer tube, a central tube and an inner tube, wherein the outer tube is slidably guided around the middle tube, and the inner tube slidably in the middle tube.

State of the art

Telescopically extendable handles for various utensils are known in the art. Thus, for example, extracts in one direction, in which one part is brought into motion and another follows over a driver, previously known.

The from the DE 20 2014 103 225 U1 known retractable rod for a hand tool has an inner tube and an outer tube, which are mutually displaceable in the axial direction. A shift is only possible if a lock is released. Using a pommel, which is connected via a steel wire with an axially displaceable part of the lock, the lock is released, so that the inner tube can be pressed or pulled relative to the outer tube to adjust the telescopic rod to the desired length.

From the US 7,096,530 B2 a paint roller with extendable handle is known, which has three nested and mutually displaceable pipes. In this case, a second tube is slidably disposed in a first tube and a third tube is slidably disposed in the second tube. The operation of the telescopic handle is done by the second tube is moved relative to the first tube. The third tube arranged in the second tube, on the other hand, automatically follows the movement between the first and second tubes. This is accomplished by a steel strip capable of transmitting both tensile and compressive forces. If the telescopic handle is extended, the steel belt acts as a pushing element, while when shortening the telescopic handle, the steel belt is used as a tension element. The steel band after the US 7,096,530 B2 must therefore absorb both tensile and compressive loads and is deflected via built-in rollers. Due to the deflection, there is the danger that the steel strip will be damaged and torn at the edge. This can shorten the life of the mechanism, especially if length adjustments of the stem are often made.

Presentation of the invention

The invention has for its object to propose a telescopic handle, which is pulled out in three parts and whose mechanism has an increased life. This object is achieved by means of a telescopic handle with the features of claim 1. Preferred embodiments follow from the remaining claims.

An inventive telescopic handle for cleaning equipment comprises an outer tube, a middle tube and an inner tube, wherein the outer tube slidably around the middle tube, and the inner tube are slidably guided in the middle tube, wherein the middle tube, a first tube end in the outer tube and has a second pipe end. At the first end of the tube, a first guide roller and an elongated fastening element are fastened, wherein the elongated fastening element extends in the direction of the second tube end and a second deflection roller is fastened to the side of the fastening element facing away from the first tube end. The telescopic handle according to the invention further comprises a first traction cable, the so is guided over the first pulley, that it changes direction by about 180 ° and its first Zugseilende is attached to the inner tube and the second Zugseilende is attached to the outer tube. Furthermore, the telescopic handle according to the invention comprises a second traction cable, which is guided over the second guide roller, that it changes the direction by about 180 ° and the first end of the rope is attached to the inner tube and the second end of the rope is attached to the outer tube, wherein the first traction cable and the second pull rope are arranged so that a sliding movement between the outer tube and the middle tube and a rectified displacement movement between the middle tube and the inner tube are coupled together. A manual sliding movement between the outer tube and the middle tube causes a rectified, automatic displacement movement between the middle tube and the inner tube.

Alternatively, the sliding movement of the telescopic rod can also be triggered by moving the inner and middle tube.

The three-part telescopic handle according to the invention is coupled extensible, but uses only traction cables that can be designed as drawstrings or elastic steel cables. Since a tensile stress of tension cables is more suitable material than a combined tensile and compressive stress, a long life of the telescopic extension of the telescopic handle is achieved. To work exclusively with tension cables, the pulleys and attachment points of the traction cables must be arranged as claimed. In this way, both the extraction and the telescoping elements telescoping done by traction. The use of tension elements is in particular also possible in that the deflection roller required for pulling the telescopic handle is mounted on an elongate fastening element, wherein the elongate fastening element at the middle Pipe is attached and runs inside the inner tube. The elongated fastener may be a thin rod, which is to be dimensioned so that it experiences only a negligible bending under the maximum pressure forces occurring.

The exact attachment points of the traction cables ends of the first traction cable and the cable ends of the second traction cable can be selected in a suitable manner, but a deflection of the first guide roller and the second guide roller is required by about 180 ° to the right, desired relative movement between the inner tube and the middle tube to produce.

Under a rectified, automatic displacement movement between the middle tube and inner tube is understood that a pull-out between the outer tube and the middle tube also causes an automatic extension between the middle tube and inner tube, whereas a contraction between the outer tube and middle tube also let the inner tube slide into the middle tube.

According to a preferred embodiment of the invention, the outer tube, middle tube and inner tube are each profiled so that a relative rotational movement between the nested tube pairs is not or only within normal tolerances possible. In other words, the outer tube relative to the middle tube, but also the middle tube relative to the inner tube are each rotationally rigid to each other. This can be done via any profiling of the tube, as long as they do not have a circular cross-section.

Preferably, the telescopic handle further comprises a locking device which is fixedly mounted on the central tube, wherein the locking means a includes hand-operated locking element. The telescopic handle according to the invention is actuated by manually moving the middle tube relative to the outer tube, ie, pulling it out of or inserting it. Therefore, a user must on the one hand grab the outer tube and on the other hand grab the middle tube. For this purpose, a suitable and ergonomically shaped grip area must be provided, which can detect the locking device in the case of the middle tube. Since after setting the desired length of the telescopic handle this is to be held exclusively on the outer tube, the position of the middle tube should be locked relative to the outer tube.

Preferably, the manually operable locking element is a spring-loaded engagement element, which is positively engageable in the inner tube and manually operated out of the inner tube can be disengaged. After a sliding movement between outer tube and middle tube according to the invention causes a rectified, automatic displacement movement between the middle tube and inner tube, the position of middle tube to outer tube is fixed to each other by a fixation between the middle tube and inner tube in the same way is held on the traction cables and the outer tube in the starting position.

According to a preferred embodiment, the engagement element is a bolt which is positively engageable in openings in the inner tube. This is a very simple solution and also makes it possible to define defined detent positions for the engagement element by a pin positively engages in openings in the inner tube. The provision of defined detent positions makes it possible for certain activities to be recognized as suitable extraction positions of the telescopic handle in a simple and reproducible manner again.

Brief description of the figures

• Fig. 1 eine schematische Ansicht des erfindungsgemäßen dreiteiligen Teleskopstiels zeigt;
• Fig. 2 schematisch den Ausziehmechanismus im dreiteiligen Teleskopstiel verdeutlicht; und
• Fig. 3 den Verriegelungsmechanismus des erfindungsgemäßen Teleskopstiels darstellt.

The invention will be described purely by way of example with reference to the accompanying drawings, in which

• Fig. 1 shows a schematic view of the three-part telescopic handle according to the invention;
• Fig. 2 schematically illustrates the extraction mechanism in the three-part telescopic handle; and
• Fig. 3 represents the locking mechanism of the telescopic handle according to the invention.

Ways to carry out the invention

The invention will be described purely by way of example with reference to the figures, which represent a possible embodiment of the invention, however, depending on the application very elongated geometry of the telescopic handle is shown for better clarity of the components, each with relatively short individual elements.

The in Fig. 1 Telescope handle shown is generally designated by reference numeral 10. It consists of three tubular elements, an outer tube 13, which, as in the example according to Fig. 1 , may be surrounded by a suitable handle member 11, for example, an elastic, arranged over the outer tube Teflon sleeve. Alternatively, the outer tube 13 may be provided with a suitable coating. Slidably guided in the outer tube 13 is the middle tube 14. In the middle tube 14, an inner tube 15 is arranged. As is apparent from the schematic representation in Fig. 1 it can be seen, both the central tube 14 and inner tube 15 are not annular, but provided with groove-shaped beads 17a, 17b, which serve for producing a torsionally rigid connection. To the torsionally rigid connection between the outer tube and the middle tube, as well as between the middle tube and the inner tube, are each outside the middle tube 14 as well as inner tube 15 form-fitting elements 17a and 17b, such as flats or grooves, provided which cooperate positively with counter elements not shown in the figures ,

As in Fig. 1 is shown, a handle 16 is provided on the central tube. A user thus holds the telescopic handle with both hands by placing one hand around the handle member 11 in the outer tube 13 and the other hand around the handle 16. Upon actuation of the telescopic handle the locking button 12 is also actuated, by means of which a lock between the central tube 14 and the inner tube 15 is released, whereupon the telescopic handle is retractable or after use reinserted.

The locking mechanism with the locking knob 12 is shown schematically in FIG Fig. 3 and may include a tilting member 18 which is rotatable about an axis 20 and in a locking position, for example by means of a spring 19, is biased. If pressure is now exerted on the locking button 12, the tilting element 18 and the axis 20 are pivoted against the force of the spring 19. There are many alternatives known in the art to lock together two rotatably interconnected and nested tubes. The simplest possibility is to provide passage openings 21 in the inner tube 15 at graduated intervals, in which a pin-shaped locking element 23 engages, which is provided on the tilting element 18. With a pressure on the locking knob 12, therefore, the locking pin 23 is moved out of one of the locking holes 21, whereupon a relative movement between the individual tubes is possible. About an audible engagement of the peg-shaped locking element in a passage opening is the User signals that the telescopic handle is securely locked.

The telescopic handle is actuated by a user increases or decreases the distance between the handle member 11 on the outer tube 13 and the handle 16. Simultaneously with the resulting relative movement between the outer tube 13 and the middle tube 14, the coinciding relative movement between the middle tube 14 and the inner tube 15 also takes place, as will be described below with reference to the schematic FIG. 2 will be explained. Fig. 2 shows schematically and in a greatly shortened view of the outer tube 13, middle tube 14 and inner tube 15 in a sectional view. As in Fig. 2 is shown, a first guide roller 22 is rotatably mounted at the proximal end of the tube 14 of the central tube. Also secured to the proximal end of the central tube via a suitable mounting member 26 is a rod 24 which is arranged to extend into the internal cavity of the inner tube 15. The distal end of the rod 24 rotatably supports a second diverting pulley 28.

A first pull cable 30 is guided over the first deflection roller 22. It can be in the pull rope 30 to a non-stretchable plastic rope, but also an elastic wire element or a braided metal strands of single strands. A first end of the first pull cable 30 is fastened to the proximal end of the inner tube 15, while a second end 34 of the first pull cable is fastened to the distal end of the outer tube 13. The attachment of the traction cables to the pipe ends can be done in any way.

Furthermore, a second pull cable 36 is provided which is guided over the second deflection roller 28 and deflected by the second deflection roller 28 substantially by 180 °. The second pull rope 36 has a first end of the rope 38, the on proximal end of the inner tube 15 is attached. As stated above, since the rod 24 is sized to extend into the internal cavity of the inner tube 15 and the distal end of the rod 24 supports the second guide roller 28, this means that the second pull cable begins with the second guide roller first end of the rope initially extends into the inner tube 15 and in the distal direction, to then be guided over the second guide roller 28 and deflected by this. The second cable end 40 of the second pull cable 36 is fixed in a suitable manner on the outer tube 13.

The synchronous movement of the respective slidably guided tubes is controlled by the traction cables 30 and 36. By the described positioning of the pulleys and traction cables pulling out and pushing together of the telescopic elements can be done by pulling force. This is possible because the second diverting pulley 28 needed for pulling apart is arranged on the rod 24, which is fastened to the middle tube 14 but extends inside the inner tube 15.

If a relative movement is carried out manually between the outer tube 13 and the middle tube 14, this relative movement transfers in the same way to a relative movement between the middle tube 14 and the inner tube 15. If, for example, the inner tube 14 is pushed together in the direction of the outer tube 13 Thus, the first guide roller 22, the second end is firmly connected to the outer tube 13, pushed further into the outer tube 13 and pulls the proximal end of the inner tube also in the proximal direction and thus into the central tube 14. If, on the other hand, the middle tube 14 is pulled out of the outer tube 13 in the distal direction, the second guide roller 28 is also moved in the distal direction and pulls, since the second cable end of the second pull cable 36 placed over the second guide roller 28 is fixed to the outer tube 13 related is, via the first end of the rope 38, the inner tube 15 also in the distal direction to the outside.

The advantage of the telescopic handle according to the invention is that only pull cables are used, which can achieve a significantly longer life of the entire mechanism, since the tensile stress of tension cables is more suitable for the material.

Claims (5)

A telescopic handle for cleaning utensils, comprising an outer tube (13), a middle tube (14), and an inner tube (15), said outer tube (13) slidably sliding about said central tube (14) and said inner tube (15) in the middle tube (14) are guided;
the central tube (14) having a first tube end in the outer tube (13) and a second tube end around the inner tube (15);
a first deflecting roller (22) and an elongate fastening element (24) are fastened to the first tube end, wherein the elongated fastening element (24) extends in the direction of the second tube end and a second on the side remote from the first tube end of the elongate fastening element (24) Deflection pulley (28) is attached;
a first pull rope (30) which is guided over the first deflection roller (22) that it changes the direction by about 180 ° and the first Zugseilende (32) on the inner tube (15) is fixed and the second Zugseilende (34) attached to the outer tube (13); and
a second pull cable (36) which is guided over the second deflection roller (28) in such a way that it changes the direction by approximately 180 ° and whose first cable end (38) is fastened to the inner tube (15) and whose second cable end (40) attached to the outer tube (13),
wherein the first traction cable (30) and the second traction cable (36) are arranged so that a displacement movement between the outer tube (13) and middle tube (14) and a rectified displacement movement between the middle tube (14) and inner tube (15) with each other are coupled. Telescopic handle according to claim 1, characterized in that the outer tube (13), middle tube (14) and inner tube (15) are each profiled so that a relative rotational movement between the nested Pipe pairs (13, 14, 14, 15) is not possible or only within normal tolerances. A telescopic handle according to claim 1 or claim 2, further comprising a locking device (12, 18, 20) fixedly attached to the central tube (14), the locking device comprising a manually operable locking element (12). Telescopic handle according to claim 3, characterized in that the locking element (12, 18) is a spring-loaded engagement element which is positively engageable in the inner tube (15) and manually operated out of the inner tube 15 can be expressed. Telescopic handle according to claim 4, characterized in that the engagement element is a bolt which is positively engageable in the openings in the inner tube (15).

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