EP0912131B1 - Motor-driven brush device - Google Patents

Abstract

The invention relates to a motor-driven brush device with a drive shaft (8) on which can be fitted an essentially hollow cylindrical interchangeable brush head, where the drive shaft (8) has an essentially circumferentially operating dog (19) operating in conjunction with a radially inwardly directed drive projection on the brush body, where the dog (19) widens towards the drive projection in the direction of the shaft to achieve a wedge action in co-operation with the drive projection and the dog (19) if formed in the shaft direction opposite a bearing surface (29) to operate together with an inner supporting ring on the brush body. To improve the handling of a motor-driven brush device of this kind while maintaining its reliability, it is proposed that the dog (19) be not or only partly integrated into the bearing surface (29) but, from one plane of the resting surface (29), form a guide surface (23) which projects back from the resting surface (29) viewed in the direction of the shaft.

Description

The invention relates to a motor-driven brush device with a drive shaft on which an essentially hollow cylindrical brush body exchangeable is attachable, the drive shaft a driver with one acting essentially in the circumferential direction Carrying element, which with one on the Brush body protruding radially inwards cooperates, the driving element in any case, facing the lead in name Is designed to enlarge the shaft direction Achieving a wedge effect when interacting with the Carriage lead and further the carrier in Forms a contact surface opposite the shaft direction for interaction with an inner support ring of the brush body.

Such entrainment training for on a drive shaft rotating brush bodies are known, wherein For example, outside of a cylindrical drive shaft thickening Driving elements are provided. This are even across the circumference of the cylindrical Thickening spreads and forms between each other a locking opening. The hollow cylindrical Brush body has protruding radially inwards Take-away projections, the number of which is the take-along elements corresponds to the drive shaft. There are training courses known in which three entrainment elements also cooperate with three take-offs. When the brush body is attached to the drive shaft are the lead-in advances by the Locking openings between the driver projections pushed. The locking holes are approximately open Height of the largest plane, across in a projection width of the driving elements measured in relation to the axial direction educated. The entrainment elements start from this level in the wave direction, d. H. in the direction of insertion the brush body, reduced in size, that in a projection every take-along element in the aforementioned direction, starting from the level of the locking opening, is roof-shaped. This forms oblique flanks against which the projection of the brush body in complete inserted state of the same with a rotation support the drive shaft. The power transmission from the drive shaft on the brush body takes place in the Area of these inclined flanks. Opposite the roof-shaped design of the driving element, related on the shaft direction, each driving element forms an end-face contact surface for interaction with an inner support ring of the brush body. Due to the previously mentioned wedge effect Rotation increases the pressure on these contact surfaces. As a result, the brush body is securely on the Drive shaft supported. The investment area is wider formed from the, with the contact surfaces of the driving elements aligned end face of the cylindrical drive shaft thickening. The width of the contact surface of the entrainment element - measured in a projection the greatest width of the driving element in Area of a locking opening.

In view of the state of the art described above becomes a technical problem of the invention therein seen a motor-driven brushing device in Improve the type in question in terms of handling, this with undiminished operational safety.

This problem is first and foremost with Subject of claim 1 solved, with reference to it is that the driving element in the contact surface is not included, however, assigned one Level of the contact surface, a guide surface forms, which, seen in the direction of the wave, from the contact surface backs away.

The invention further relates to a motor-driven Brush device according to the features of the generic term of claim 1. In order to maintain operational safety Achieving improved handling is invented suggested that the entrainment element forms part of the contact surface, however, starting from from a plane of the contact surface, a guide surface trains which, seen in the direction of the wave, from the Starting area backs away.

Regardless of whether the driving element in the contact surface is not included or part of the investment area is formed by the inventive design the brush body for removal of the same captured and rotated slightly on the drive shaft in such a way that the brush body-side projection the sloping edges of the wedge effect Take away elements and then the between the locking openings formed the driving elements find. In this position, the brush body be subtracted in the easiest way in the axial direction. When the brush body is turned to find it of the locking openings there are frictional forces between the contact surfaces and the inner support ring of the brush body. According to the invention Frictional forces are reduced because the driving elements, such as already mentioned, not or only partially in the contact area are involved. If not included only the contact surface of a cylindrical one acts Drive shaft thickening, on which the driving elements are arranged on the outside wall side. Conditionally This configuration makes a brush change in terms of handling relieved, with undiminished Operational safety because of the cylindrical thickening remaining investment area sufficiently large is dimensioned to the wedge effect between driving elements and driving projections of the brush body, at which increases the pressure on the contact surface, to ensure. According to the invention it is provided that one A guide surface is assigned to the level of the contact surface which, seen in the direction of the wave, is not in the bearing surface included driving element of the Backslot. With a partial education the contact surface gives way through the driving element return the area from the contact area. It is therefore another sloping edge on the Driving element formed, which when inserted a brush body with a driving projection of the same cooperates. This take-away lead hits therefore not, as in the prior art, against the Contact surface of the driving element, but in axial Considered insertion direction, against the inclined Instructor area. Education is preferred in which on the circumference of the cylindrical drive shaft thickening three trained according to the invention Driving elements arranged evenly on the circumference are. Hit when inserting a brush body the inward protruding take-away tabs under slight pressure on the guide surfaces of the driving elements, after which the take-off leads continue under slight pressure on these inclined guide surfaces slide along. This sliding causes simultaneous rotation of the brush body, so that on End of a guide area of the lead projection assigned to it right in front of between two take-along elements formed locking opening is. The Brush body can then be easily Push in as far as it will go and reach the correct one Position. This configuration makes it easy to attach a brush body on the drive shaft simplified. The user does not have to, as in the state of the Technology, by turning the brush body under light Try pushing the locking holes between find the take-away items. This more or less long trying is not user-friendly, in addition, such a brush change mostly in to Device stooping is done. According to the invention a solution has been found here, which is a discovery the locking holes from any Position of the brush body guaranteed. Through the Formation of guide surfaces on the driving elements are the locking openings in the area of the guide wide open. Viewed in the direction of insertion, these locking openings taper up to an opening width which is approximately the width of a Carriage lead corresponds. The lead-in advances are forced into the correct position. It is preferably proposed that the Contact surface is comparatively small and in the guide surface receding in the direction of the wave transforms. For this purpose, it is proposed that the driver element with respect to a parallel to the drive shaft axis extending center axis symmetrical is. Accordingly, each driving element has on both sides its longitudinal axis has an inclined guide surface on. These guide surfaces are preferred in the head area, d. H. in the intersection of the two surfaces, rounded. The apex of this rounding lies at the level of the contact surface of the cylindrical Drive shaft thickening, with which this apex area likewise forms a contact surface, which, however in comparison to the described prior art is small. By this rounding will find the locking holes further facilitated by the take-away projections. To meet the latter on the head radius, so they slide under light pressure from this onto the adjacent guide surface. Training is preferred at which the driving element is approximately symmetrical to one perpendicular to the shaft axis, with respect to the Driving element central plane is formed. On both sides of this central plane of the driving element sloping flanks are provided. The driving element is therefore - approximately roof-like starting from the area of the central plane shaped to form the parallel on both sides to the shaft axis extending longitudinal axis of the driving element arranged inclined flanks. Serve here a pair symmetrical to the longitudinal axis of the driving element arranged inclined flanks to interact with a lead in the operating position Achievement of the wedge effect. The these sloping flanks opposite with respect to the center plane of the driving element Sloping flanks serve as insertion aids for the take-away advantages when the Brush body. Finally, it is envisaged that Take-along element in a projection into a plane essentially diamond-shaped or square plan having. Here, those pointing in the axial direction can Top areas more or less rounded his. It is further preferred that approximately across Axis-pointing tips of the diamond-shaped or beveled quadratic plan such that Locking opening walls running parallel in the axial direction are formed.

Fig. 1

ein erfindungsgemäßes motorangetriebenes Bürstengerät in einer perspektivischen Darstellung;

Fig. 2

das Bürstengerät in einer Unteransicht, bei partiell aufgebrochenem Bodenblech und bei in strichpunktierter Linienart wiedergegebenen, eingesetzten Bürstenkörpern;

Fig. 3

eine perspektivische Einzeldarstellung eines Bürstenkörpers;

Fig. 4

einen Querschnitt durch eine Antriebswelle des Bürstengerätes, mit Blickrichtung auf Einweiserflächen von auf einer zylindrischen Verdikkung der Antriebswelle angeordneten Mitnahmeelementen, in einer stark vergrößerten Darstellung;

Fig. 5

eine Draufsicht zu Fig. 4;

Fig. 6

eine Unteransicht zu Fig. 4;

Fig. 7

eine perspektivische Darstellung des Antriebswellenbereiches gemäß Fig. 4;

Fig. 8

eine Ausschnittsdarstellung des Kupplungsbereiches zwischen Antriebswelle und Bürstenkörper, bei geschnittener Darstellung des Bürstenkörpers;

Fig. 9

den Schnitt gemäß der Linie IX-IX in Fig. 8, jedoch unter Fortlassung von Antriebswelle und Mitnahmeelementen;

Fig. 10

eine der Fig. 9 entsprechende Darstellung, jedoch in auf die Antriebswelle aufgestecktem Zustand des Bürstenkörpers;

Fig. 11

eine der Fig. 10 entsprechende Darstellung, jedoch nach einem Verdrehen des Bürstenkörpers in eine kraftschlüssige Verriegelungs- bzw. Mitnahmestellung.

The invention is explained below with reference to the accompanying drawing, which, however, only represents an exemplary embodiment. Here shows:

Fig. 1

a motor-driven brush device according to the invention in a perspective view;

Fig. 2

the brush device in a bottom view, with the floor panel partially broken open and with brush bodies shown in dash-dotted lines;

Fig. 3

an individual perspective view of a brush body;

Fig. 4

a cross section through a drive shaft of the brush device, with a view of the guide surfaces of driving elements arranged on a cylindrical thickening of the drive shaft, in a greatly enlarged representation;

Fig. 5

a plan view of Fig. 4;

Fig. 6

a bottom view of Fig. 4;

Fig. 7

a perspective view of the drive shaft area of FIG. 4;

Fig. 8

a sectional view of the coupling area between the drive shaft and brush body, with a sectional view of the brush body;

Fig. 9

the section along the line IX-IX in Figure 8, but omitting the drive shaft and driving elements.

Fig. 10

a representation corresponding to FIG. 9, but in the state of the brush body attached to the drive shaft;

Fig. 11

a representation corresponding to FIG. 10, but after turning the brush body into a non-positive locking or driving position.

Is shown and described initially with reference to Fig. 1 is a motor-driven brush device 1, which in the embodiment shown as an attachment is designed for a vacuum cleaner. The brush device 1 essentially consists of a housing 2 and a pipe connection piece 3 together. In the case 2 extends a suction channel 4, from the pipe connection piece 3 going out into a suction chamber 5. The latter is located in a front area, which faces away from the pipe connection piece 3 and extends almost over the entire width of the housing (see Fig. 2).

Furthermore, there is a separate drive in the housing 2 6 arranged, which itself via a toothed belt 7 in the suction chamber 5 extending drive shaft 8 in rotation transferred. The toothed belt 7 lies in a belt housing 9, which on the drive shaft 8 facing away End is pivotally mounted. The The pivot axis also forms the power transmission axis from the separate drive 6 on the toothed belt 7 and lies parallel to the drive shaft 8.

The toothed belt drive or the belt housing 9 extends starting approximately from the center of the suction chamber 5 perpendicular to the drive shaft 8. On that of the drive shaft 8 associated end engages the toothed belt 7, at least within a gear housing 10 a drive pulley 11, of which the two-part on both sides Drive shaft 8 goes out. The latter extends starting from the drive pulley 11 to a lateral end area of the suction space 5.

Each drive shaft 8 is approximately in the middle of its longitudinal extent a driver 12.

2, the brush device 1 is in a bottom view shown, the bottom 13 in the area of the suction chamber 5 of the brush device 1 is partially broken open. It is to recognize that on the side facing away from the suction chamber 5 Side, d. H. at the level of the pipe connection piece 3, two Rollers 14 are arranged on the bottom.

From the gear housing 10 go to both sides 8 gear boxes 15 coaxial with the drive shafts, which extend at a distance up to the drivers 12.

The brush device 1 is for use as more common Attachment for an electric vacuum cleaner to maintain Carpets, especially for vacuuming the like, equipped with brush bodies 16. This brush body 16 are shown in dash-dot lines in FIG.

Each brush body 16 is designed as a hollow body and is arranged on the outside with two offset by 180 ° Bristle rows 17, which differ from starting from an end region of the brush body 16 extend approximately 180 ° in a spiral around the latter.

The brush bodies 16 are on the drive shafts 8 inserted and extend in the installed state starting from the gear housing 10 into the End area of the suction chamber 5. The power transmission from the drive shaft 8 takes place on the brush body 16 via the driver 12 of the drive shaft 8.

The driver 12 of the drive shaft 8 is in FIG. 4 to 7 shown in more detail.

It can be seen that the driver 12 is essentially from a cylindrical sleeve 18 with the outside of the jacket arranged driving elements 19 is composed. Three driving elements 19 are provided, which are evenly distributed over the circumference of the sleeve 18th are connected to the same material.

The driving elements 19 are essentially plate-like formed and point in a projection into a Level an essentially square plan, with two opposite corner areas of this approximate square plan parallel to Shaft axis x are aligned (see FIG. 5). Therefore is each driving element 19 in one 5 based on the end faces 20 and 21 of the sleeve 18 is rotated approximately 45 °, with which Form sloping flanks on the driving element side. The the oblique flanks facing the end face 20 serve as Transfer areas 22. The peak area between these two transmission surfaces 22 is slightly rounded, with the apex of this curve level with the end face 20 of the sleeve 18 closes.

Furthermore, each driver element 19 is approximately symmetrical a perpendicular to the shaft axis x, with respect to of the driving element 19 in the central plane E. The opposite of the transfer surfaces 22 Sloping flanks are related to the central plane E formed as guide surfaces 23. Here is the Corner area between these guide surfaces 23 strong rounded to form a frontal curvature surface 23 ', the apex of which is level with the end face 21 of the sleeve 18 is positioned.

The areas of the Driving element 19 are truncated to form rectilinear guide surfaces 24 which are parallel to Shaft axis x are aligned.

As already mentioned, the three entrainment elements 19 evenly distributed over the circumference of the sleeve 18. The width of each driver element 19 -measured transversely to the shaft axis x- is such that 19 locking openings between the driving elements 26 remain to pass through on the brush body 16 radially inward projecting driving projections 26. Starting from the area between two Guide surfaces 24 of two driving elements 19 opens the locking opening 25 towards the End face 21 of the sleeve 19, due to the Arrangement of the inclined guide surfaces 23.

The essentially hollow cylindrical brush body 16 already points to the coupling with the drive shaft 8 mentioned inward projecting take-away projections 26 on. There are three such projections 26 at an equal distance from each other on the inner circumference of the Brush body 16 in the form of six-sided pin intended. With an axial distance to these driving projections 26 is also on the inside of the brush body 16 a support ring 27 is arranged, the distance between the driving projections 26 and the support ring 27 corresponds approximately to the axial length of the sleeve 18. The radial extent of the driving projections 26 is so chosen that a coaxial, in cross section essentially circular free space remains, its diameter essentially the outer diameter of the sleeve 18 below Disregarding the driver elements 19 corresponds.

For attaching a brush body 16 to the drive shaft 8, the brush body 16 via the drive shaft 8 pushed, the latter the free space in the area the driving projections 26 and one corresponding to the Outside diameter of the drive shaft 8 dimensioned breakthrough 28 passes through the support ring 27. The lead-in advances 26 occur in the course of further introduction of the brush body 16 either directly into the locking openings 25 one or become non direct Locating these openings 25 through the guide surfaces 23 led to these. This is how that when the driving projections hit 26 the curved end face 23 'or on the guide surfaces 23 under slight pressure from the user The projections 26 slide off along the guide surfaces 23 takes place. This slipping causes the simultaneous Rotation of the brush body 16 so that at the end the guide surfaces 23 the driving projections 26 directly in front of the formed between the guide surfaces 24 Lock openings 25 are. Among other easy Pressure can then continue the brush body 16 in shift the correct position.

The further displacement of the brush body 16 takes place until the support ring 27 strikes the end face 21 of the sleeve 18. The end face 21 forms here a contact surface 29.

When the drive shaft 8 rotates during the Operating state, a power transmission takes place through the driving of the driving projections 26 over the transmission surfaces 22. This creates a wedge effect such that the pressure on the support ring 27 over the contact surface 29 is reinforced. So there are no further fasteners required.

The contact surface 29 of the sleeve 18 is slightly enlarged due to the level at the same level Vertex area 23 'of the driving elements 19 between their guide surfaces 23. However, there are also Training conceivable in which the dimensions of the driving elements 19 are chosen so that the transition area from one guide surface 23 to the other opposite the Contact surface 29 of the sleeve 18 is arranged set back is. The contact surface is due to this measure 29 kept as small as possible, but with undiminished Operational safety, d. H. with undiminished Pressure transfer to the support ring 27 with a wedge effect in the area of the transmission surfaces 22.

This measure is particularly useful when removing a brush body 16 is advantageous. For this the Brush body 16 first from the wedged position with the transfer surfaces 22 somewhat back in the direction can be rotated to the locking openings 25. The occurring in the area of the contact surface 29 The inventive design creates frictional forces kept so small that turning back effortlessly is guaranteed.

Furthermore, the configuration according to the invention means that Given advantage that the brush body 16 from each coming through under any pressure introduced the user into the locking openings 25 can be. The driving projections 26 are here inevitably by the guide surfaces 23 in brought the right situation. This is the handling simplified when changing brushes.

Claims (5)

1. Motor-driven brush unit (1) with a drive shaft (8) on which a substantially hollow-cylindrical brush body (16) can be fitted in an exchangeable manner, it being the case that the drive shaft (8) has a carry-along means (12) with a carry-along element (19) which acts substantially in the circumferential direction and interacts with a carry-along protrusion (26) projecting radially inwards on the brush body (16), it being the case that the carry-along element (19), facing the carry-along protrusion (26), is formed such that it increases in size in the direction of the shaft, in order to achieve a wedge action upon interaction with the carry-along protrusion (26), and it also being the case that the carry-along means (12) forms, opposite, as seen in the direction of the shaft, an abutment surface (29) for interaction with an inner supporting ring (27) of the brush body (16), characterized in that the carry-along element (19) is not included in the abutment surface (29) but, adjoining a plane of the abutment surface (29), forms a guide surface (23) which, as seen in the direction of the shaft, projects back from the abutment surface (29).
2. Motor-driven brush unit (1) according to the features of the preamble of Claim 1, characterized in that the carry-along element (19) forms part of the abutment surface (29) but, starting from a plane of the abutment surface (29), forms a guide surface (23) which, as seen in the direction of the shaft, projects back from the abutment surface (29).
3. Motor-driven brush unit according to one or more of the preceding claims, characterized in that the abutment surface (29) is of comparatively small form and merges into the guide surface (23), which projects back in the direction of the shaft.
4. Motor-driven brush unit according to one or more of the preceding claims, characterized in that the carry-along element (19) is formed approximately symmetrically to a plane (E) which runs perpendicularly to the shaft axis (x) and is in the centre of the carry-along element (19).
5. Motor-driven brush unit according to one or more of the preceding claims, characterized in that the carry-along element (19), in a projection into a plane, has a substantially diamond-shaped or square outline.

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