EP2578129B1 - Cable drum unit for a vacuum cleaner and vacuum cleaner with such a cable drum unit - Google Patents

Description

The invention relates to a cable drum unit for a vacuum cleaner with a cable drum for a below sometimes just referred to as cable connection cable of the vacuum cleaner and with a drive device, for example acting as a drive device rolling or winding spring, for rotating the cable drum.

From the DE 10 2005 018 008 A Such a cable drum unit is known. There is described a cable reel unit for a vacuum cleaner with a winding system for a connection cable comprising a drive device for rotating the cable drum and beyond an activating device, via which the drive device is set or released, a locking device, via which the activating device in which the Drive device is held in gear setting or releasing state, and a reset means which deactivates the locking device by pulling the connecting cable in the unwinding and hereby the activating device.

The US 2006/0021184 A1 and the JP 2003 135340 A , which correspond to the preamble of independent claim 1, disclose a cable drum unit for a vacuum cleaner with a braking device, via which a rotatability of the cable drum is prevented or released. As a braking device acts as a pivotable clamping disc and a rotatable with the cable drum friction wheel, wherein the clamping disc jammed the friction wheel in a first orientation.

Although this cable drum unit has proven itself in practical use, there is still room for improvement with regard to the number of individual elements required and functional integration.

Accordingly, it is an object of the invention to provide a further embodiment of a cable reel unit, in particular an embodiment in which a number of required elements or at least their complexity is reduced.

This object is achieved with the features of claim 1. These are in a cable drum unit for a vacuum cleaner with a cable drum for a connection cable of the vacuum cleaner and with a drive device for rotating the cable drum, for example a scroll spring, a braking device over which rotatability of the cable drum is prevented or released, and an actuating element, via which disables the braking device and set the drive device in motion is provided, wherein acts as a braking device, a pivotable clamping disc and a rotatable with the cable drum friction wheel and wherein the clamping disc jammed the friction wheel in a first orientation.

By acting as a braking device a clamping disc and a friction wheel, resulting in a few parts with low complexity, wherein the pivoting movement of the clamping disc and the jamming of the friction wheel through the clamping disc in a first orientation of the clamping disc additionally results in a little complex mechanism.

Advantageous embodiments of the invention are the subject of the dependent claims. This used backlinks point to the further development of the subject matter of the main claim by the features of the respective subclaim; they may also contain independent inventions having a design independent of the objects of the preceding claims and are not to be understood as a waiver of the achievement of independent, objective protection for their characteristics. Furthermore, with a view to an interpretation of the claims in a closer specification of a feature in a subordinate claim, it is to be assumed that such a restriction does not exist in the respective preceding claims.

By the jamming of the friction wheel with the clamping disc is carried out automatically by the friction wheel due to the at least indirectly acting on the friction wheel drive device, no additional parts are necessary. The drive device acts at least indirectly on the friction wheel, by acting directly on the cable drum and drives the cable drum, for example with a drum gear rim provided there, the friction wheel via a provided on the friction wheel Reibradzahnkranz. Automatically, the jamming of the friction wheel takes place through the clamping disc by acting upon acting drive device, ie z. B. a tensioned scroll spring, this tries to rotate the drum in the winding direction, while also causing a rotation of the friction wheel. Characterized the voltage applied to the friction wheel clamp plate is brought into the first orientation and thus causes the jamming of the friction wheel.

In a particular embodiment of the cable drum unit is provided that the clamping disc facing away from its pivot axis and the friction wheel facing contact surface for contacting the friction wheel, that by the friction wheel during unwinding of the connecting cable, the contact surface in a direction of rotation of the friction wheel on a between an axis of rotation of the Friction wheel and the pivot axis of the clamping disc extending connecting line lying position can be transferred and that when disabling the braking device, the clamping disc is released and can be transferred to a position below this connection line. The position just described above the Connecting line takes the clamping disk in its first orientation when the clamping disc releases the rotation of the friction wheel and after the removal of the connecting cable performs a short-term, opposite rotation and thus causes the jamming of the friction wheel. The contact surface of the clamping disc is provided so that the friction wheel can take the clamping disc when pulling the connecting cable from the drum in this first position. During a reverse rotation of the friction wheel at the end of the withdrawal of the connection cable and under the action of the drive device, the frictional contact between the contact surface of the clamping disc and the friction wheel causes a slight pivoting back of the clamping disc and a frictional engagement between the clamping disc and the friction wheel. In this way, the provided for braking the rotational movement of the drum in the winding direction clamping of the friction wheel. To deactivate the braking device, the clamping disc is released and transferred to a position below the above-mentioned connecting line, from which it is taken back by the friction wheel in the direction of the position above the connecting line as soon as the cable drum is moved in the unwinding.

The cable reel unit according to the invention, in which the clamping disc is released when deactivating the braking device, is characterized in that the clamping disc is also translationally movable in addition to the pivoting movement and guided in certain orientations in its translational motion on a backdrop formed in the actuator. The guide in the backdrop first causes a translational adjustment of the clamping disc. In such an adjustment, ie z. As a support to the gate, the jamming of the friction wheel with the clamping disc is possible. In that regard, it is provided in a particular embodiment, that the clamping disc in its first orientation and when jamming the friction wheel on the gate formed in the actuator, z. B. an inclined surface supported. If the backdrop is not effective, so the clamping plate z. B. is not supported on the backdrop, the translational mobility of the clamping disc is released so that the jamming of the friction wheel canceled and the clamping plate can be transferred to the position below the connecting line.

A particularly simple possibility for realizing a translational mobility of the clamping disk is that the clamping disk has a slot and is held in the slot on an axis. With the slot the clamping disc is pivotally mounted on the axle. In the direction of the largest axis of the slot, the clamping disc is also translationally movable. The orientation of the slot in the clamping disc is chosen so that the guide through the gate of the actuating element, in particular the support on the gate of the actuating element, is possible.

In one embodiment, the cable reel unit is provided that the clamping disc on a front side edge to the slot has a front collar, with which the clamping disc is supported in the first orientation when jamming the friction wheel on the gate formed in the actuator. The front collar forms a peripheral contour of the clamping disc and therefore does not necessarily have to be performed circumferentially around the slot. A peripheral embodiment of the front collar is nevertheless possible to allow easy contact of the slot with a plug-in axis, when the plug axis has latching elements which engage around the front collar. The front collar - regardless of whether it is circumferential or not circulating - is designed as a contour intended to interact with the gate formed in the actuator and designed accordingly. With the front collar, the clamping disc is supported on the actuating element, when the friction wheel is jammed.

By the clamping disc on a rear side edge to the slot having a rear collar which cooperates with the actuating element so formed with a link in the actuator backdrop, that with progressive actuation of the actuator translational movement of the clamping disc possible and an existing jamming of the friction wheel is released, the clamping disc and their pointing towards the backdrop of the actuator edge-side contour both for braking the cable drum as well as for canceling the braked configuration effectively. By cooperating with progressive actuation of the actuating element of the rear collar so with the backdrop formed in the actuator, that a translational movement of the clamping disc is possible, it is repealed with the frictional engagement existing during jamming of the friction wheel. The rotatability of the friction wheel is given again and thus also the rotatability of the cable drum, which then causes the retraction of the connection cable under the influence of the drive device.

In a further embodiment, it is provided that the slide in the actuating element is formed in two planes parallel to the direction of the longitudinal extent of the actuating element. In this case, the link in a first plane comprises an inclined surface for cooperation with the front collar of the clamping disc and in a second plane parallel to the first plane, a first and a recessed, second rectilinear portion for cooperation with the rear collar of the clamping disc. By the actuator comprises a backdrop in two planes or - depending on the view - in each of the two parallel planes in each case a backdrop, the actuator is both when braking the cable drum by jamming the clamping disc between the actuator and its respective backdrop on the one hand and the friction wheel on the other hand also effective when releasing the braked cable drum by using the second link the clamping disc to release the jammed friction wheel self is released. One and the same actuator thus has different function depending on the position in the cable reel unit and by the actuator assumes such a multiple functionality, otherwise required additional parts can be omitted.

If a transition between the first and the second rectilinear portion of the gate (second gate) in the actuating direction of the actuating element above the inclined surface (first gate) is in a hereinafter referred to as brake lever actuator with a two-level backdrop, is when operating the Actuating element, ie the downward pressing of the actuating element, the inclined surface moved downwards, so that at a jammed friction wheel on the inclined surface supporting clamping plate is released at this point. If, during the further depression of the actuating element, the rear contour of the clamping disk comes into the region of the transition between the first and the second rectilinear section of the guide, a translational movability of the clamping disk is released, so that the clamping disk retracts and thus the jamming of the friction wheel can be canceled ,

In order to keep the clamping disc in contact with the friction wheel or at least to press in the direction of the friction wheel, comes a spring element, in particular a leaf spring or the like, into consideration. With such a spring element is a permanent contact between the clamping disc and the friction wheel, at least one touch contact in all configurations, as they are relevant when activating or deactivating the braking device guaranteed. By having such a touch of contact, when unwinding the connecting cable from the cable drum, the friction wheel can take the clamping disc to a position from which it will move when the friction wheel is jammed, namely when the unwinding process is stopped, in an orientation jamming the friction wheel.

As a point of attack for the spring element on the clamping plate is especially a stop formed on the front collar into consideration. Then, the spring element may be arranged laterally next to the actuating element and a z. B. in a leaf spring as spring element resulting travel remains completely outside the resulting in operation different contact areas between actuator and clamping disc.

By the friction wheel is associated with a brake in a particular embodiment of the cable reel unit, which contacts a Reibradgehäuse under the influence of centrifugal force, the brake associated with the friction wheel acts as a synchronizing brake and causes when winding the connecting cable, a limitation of the rotational speed of the cable drum.

A particular embodiment of such a constant-velocity brake is that the friction wheel has a circumferential friction surface and in a plane parallel to the friction surface as a brake at least one under centrifugal force an inner side of the Reibradgehäuses contacting brake element. At least one resiliently mounted brake arm, which is suitable under the influence of centrifugal force due to the resilient mounting, on the one hand to contact the friction wheel housing and, on the other hand, to reduce or limit the rotational speed of the friction wheel due to the frictional connection between the friction wheel housing and the brake element, is used as braking element. From such a reduction or limitation of the rotational speed of the friction wheel directly results in a reduction of the rotational speed of the cable drum, when the friction wheel and cable drum are connected directly or indirectly via a Reibradzahnkranz and a Drelzelzahnkranz.

As a drive device for the drum unit is a scroll spring into consideration. Such a spring is easy to install and able to apply the force required to wind a disconnected lead. In addition, the stored spring force is converted directly into a rotational movement of the cable drum at a release of the caused when removing the connecting cable bias of the scroll spring.

Another embodiment of the cable drum unit is characterized in that the actuating element is mounted spring-loaded, z. B. by using a torsion spring, and as a means for releasing as well as for producing the indirectly engaging on the cable drum brake device, in particular a friction wheel and a clamping disc as a braking device, is formed. The spring force acting on the actuating element allows the actuating element to assume defined positions as a function of a position of other elements of the braking device, in particular of the clamping disk. By the braking device acts indirectly on the cable drum, the brake unit can be particularly easily supplemented by a further functionality, eg. B. a constant velocity brake. Finally, by the actuating element for releasing or releasing and activating the indirectly acting on the cable drum braking device is a simple operation of the actuating element, so a so-called inching operation, sufficient to solve the braking device, so that no permanent operation the actuating element is required and when the actuating element is designed both for releasing and for activating the braking device, otherwise required additional parts are saved.

Overall, the description presented here also relates to a vacuum cleaner with a cable drum unit as described here and below. Basically, that comes Cable reel unit also for use with other mobile household or gardening equipment, such. As a lawn mower or the like, into consideration.

A central advantage of the cable reel unit described here is that only three parts, namely actuator, clamping disk and friction wheel, as activating device, via which the drive device is set or released, as a braking device, via which an effect of the drive device is prevented, and as Reset device, which deactivates the braking device by pulling the connecting cable in the unwinding and hereby the activating act.

An embodiment of the invention will be explained in more detail with reference to the drawing. Corresponding objects or elements are provided in all figures with the same reference numerals. The or each embodiment is not to be understood as limiting the invention. Rather, in the context of the present disclosure, numerous modifications and variations are possible, in particular those variants, elements and combinations, for example, by combination or modification of individual in conjunction with those described in the general description, the or each embodiment and the claims and in the Drawings contained features or elements or process steps for the expert in terms of solving the problem can be removed and lead by combinable features to a new subject or to new process steps or process steps.

Figur 1

eine Kabeltrommeleinheit mit einem Trommellager, einer Kabeltrommel und einer am Trommellager angebrachten und auf die Kabeltrommel wirkenden Bremseinrichtung,

Figur 2

die Kabeltrommeleinheit aus Figur 1 in einer Explosionsdarstellung,

Figur 3

ein als Teil der Bremseinrichtung der Kabeltrommeleinheit vorgesehenes Reibrad,

Figur 4

ein Betätigungselement (Bremshebel) und eine Klemmscheibe als weitere Teile der Bremseinrichtung der Kabeltrommeleinheit,

Figur 5, 6 und Figur 7

Momentaufnahmen bei der Bewegung der Klemmscheibe beim Abziehen eines Anschlusskabels von der Kabeltrommel,

Figur 8

zeigt eine Konfiguration der Bremseinrichtung bei gebremster, also hinsichtlich ihrer rotatorischen Lage fixierter Kabeltrommel,

Figur 9

einen vergrößerten Ausschnitt aus der Darstellung in Figur 8,

Figur 10

die Klemmscheibe 32 von der im Vergleich zu Figur 9 rückwärtigen Seite,

Figur 11, 12

Momentaufnahmen beim Freigeben einer translatorischen Beweglichkeit der Klemmscheibe mit Hilfe einer dafür im Betätigungselement vorgesehenen Kulisse, sowie

Figur 13, 14

ein um eine Gleichlaufbremse ergänztes Reibrad.

Show it

FIG. 1

a cable drum unit with a drum bearing, a cable drum and a brake device mounted on the drum bearing and acting on the cable drum,

FIG. 2

the cable reel unit off FIG. 1 in an exploded view,

FIG. 3

a friction wheel provided as part of the braking device of the cable drum unit,

FIG. 4

an actuator (brake lever) and a clamping disc as further parts of the brake device of the cable drum unit,

FIGS. 5, 6 and FIG. 7

Snapshots during the movement of the clamping disc when removing a connecting cable from the cable drum,

FIG. 8

shows a configuration of the braking device with braked, so fixed in terms of their rotational position cable drum,

FIG. 9

an enlarged section of the illustration in FIG. 8 .

FIG. 10

the clamping plate 32 of the compared to FIG. 9 rear side,

FIG. 11, 12

Snapshots when releasing a translational mobility of the clamping disc by means of a provided in the actuator link, as well

FIG. 13, 14

a friction wheel supplemented by a synchronized brake.

FIG. 1 and FIG. 2 each show a cable drum unit 10 and in FIG. 1 in assembled condition and in FIG. 2 in an exploded view. The cable drum unit 10 comprises a cable drum 12, also referred to below as a drum 12 for short, a roll spring 14 for driving the drum 12 and a drum bearing 16. The drum bearing 16 has a roller spring bearing 18 for the spring 14 and a friction wheel housing 20 for a friction wheel 22. The friction wheel 22 has a circumferential Reibradzahnkranz 24 ( FIG. 3 ) provided for engagement with a rotating drum gear ring 26 of the drum 12; ie, rotation of the drum 12 upon removal of a cable 12 (not shown) on the drum 12 causes rotation of the friction wheel 22. Other embodiments and rotation of drum 12 and friction wheel 22 are also conceivable, e.g. B. with a belt or the like. Anyway, in such a rotation of the drum 12, the scroll spring 14, whose one end is fixed to a peripheral web 28 of the drum 12, wound around the web 28 and thus receives a tensioned position. In this position, the drum 12 is held by a braking device described later. After releasing the braking device, the scroll spring 14 winds back into its roll spring housing 18 and thereby drives the drum 12 in the winding, which in FIG. 1 in a drum bearing 16 formed above a rotation axis of the drum 12 cable outlet 29 corresponds clockwise.

In addition to the friction wheel 22, the brake device includes an actuating element in the form of a brake lever 30 and a clamping disk 32. The clamping disk 32 is mounted so as to be pivotable on an axle 34. For receiving the clamping disk 32 and for limiting its mobility, in particular for limiting the pivoting movement, a clamping disk housing 33 is provided. The brake lever 30 is held on the drum bearing 16 in guide elements 35 and is pressed with a torsion spring 36 against a formed on schwenkachsenseitigen end of the clamping plate 32 contour of the clamping plate 32. A leaf spring 38 acts on the clamping disk 32 and presses it in the direction of the friction wheel 22.

FIG. 3 shows the friction wheel 22 with further details, namely from both sides, namely in the left area of the representation of a also in FIG. 2 shown side (front), and in the right area of the representation of a back. Thereafter, the friction wheel 22 comprises a circumferential friction surface 40 and a brake as a constant velocity brake 42. This is here in a plane parallel to the friction surface 40 by two under the influence of centrifugal force an inside of the Reibradgehäuses 20 contacting brake elements, here brake arms 44 formed. The brake arms 44 each comprise an outgoing from the mounting location resilient part and a spring-mounted end part. The respective end part is designed here thickened to expose the influence of centrifugal force additional weight. The brake arms 44 are made in one piece and integrally formed on the friction wheel 22. As a centrifugal force and thus as a constant velocity brake 42, the brake arms 44 act when upon rotation of the friction wheel 22, the end portions of the brake arms 44 are moved outward, ie away from the pivot point of the friction wheel 22 and come into contact and in frictional engagement with the inside of the Reibradgehäuses 20 , The thus caused limitation of the rotational speed of the friction wheel 22 also acts on the rotational speed of the drum 12, which drives the friction wheel 22 by the friction wheel 22 and the Reibradzahnkranz 24 provided on the drum 12 drum ring gear 26 or otherwise suitable manner and way communicates. A limitation of the rotational speed of the friction wheel 22 thus also causes a limitation of the rotational speed of the drum 12.

FIG. 4 shows more details of the braking device, namely details of the brake lever 30 and the clamping disc 32. It can be seen a brake lever 30 formed on the gate 46, and in the clamping plate 32 a slot 48 with a circumferentially running here collar 50. With the slot 48 is the clamping disc 32 at the axis 34 ( FIG. 2 ), which is designed here as a one with the drum bearing 16 integrally connected through axle with locking functionality, both pivotally movable as well as translational, ie movable, movable.

The collar 50 extends to the edge of the clamping disc 32 and thus formed, the backdrop 46 in the brake lever 30 facing contour (edge or schwenkachsenseitige contour) of the clamping plate 32 is provided for cooperation with the gate 46 to the clamping plate 32 with the friction wheel 22nd ( FIG. 2 ) to contact or hold. In the isometric view in the left area of FIG. 4 It can be seen that an additional adjustment is formed on the collar 50. At this attacks a here designed as a leaf spring 38 spring element. The collar 50 and the outer peripheral surface of the clamping disc 32 are thus arranged in alignment with the slide 46 of the brake lever 30, while the leaf spring 38 is in a further level, as it were in front of the brake lever 30 and contacted there the stopper formed on the collar 50. The clamping plate 32 and the link 46 can thus interact unimpaired by a respective deflection of the leaf spring 38 and the leaf spring 38, the clamping plate 32 permanently press in the direction of the friction wheel 22 (see Figure 5ff). For contacting the friction wheel 22, the clamping disk 32 has a contact surface 52, which forms with a circular arc-shaped contour remote from the slot 48 end of the clamping plate 32.

In the figures described below, not all previously introduced reference numerals are sometimes drawn to obtain sufficient clarity. In this respect, reference is made to the figures described above.

FIG. 5, FIG. 6 and FIG. 7 show in the form of excerpts from the illustration in FIG. 1 Snapshots during the movement of the clamping disc 32 when removing the connecting cable from the drum 12th

Regardless of the orientation of the clamping disk 32, the leaf spring 38 ensures constant contact between the clamping disk 32 and the friction wheel 22 or at least for positioning the clamping disk 32 in the direction of the friction wheel 22. The brake lever 30 is at the bottom thereof via the torsion spring 36 upwards against the schwenkachsenseitige contour of the clamping plate 32 employed. The formed in the brake lever 30 inclined surface 47 of the link 46 limits the translational movement of the clamping plate 32 in the slot 48. The brake lever 30 must be operated against the force of the torsion spring 36.

When pulling out the cable, the drum 12 ( FIG. 2 ) by the unwinding in motion. About the teeth 24, 26 or the like and the friction wheel 22 is rotated. As soon as there is sufficient frictional engagement between the friction wheel 22 and the clamping disk 32, namely between the friction surface 40 and the contact surface 52, the rotational movement of the friction wheel 22 takes the clamping disk 32 upwards ( FIG. 5 and FIG. 6 ). An end position of this movement is in the representation in FIG. 7 reaches and the position shown there of the clamping plate 32 is here and hereinafter also referred to as a in the direction of rotation of the friction wheel 22 via a between an axis of rotation of the friction wheel 22 and the pivot axis of the clamping plate 32 extending connecting line 54 lying position even though, if not the Clamping disk 32 itself, but only the contact surface 52 ( FIG. 4 ) and, if necessary, these should not be completely, but only substantially above such a line. The pivoting movement of the clamping disk 32 is limited by the clamping disk housing 33. Due to the position above the connecting line 54 described above, this position of the clamping plate 32 is also referred to briefly as the upper position. In contrast, the in FIG. 5 shown position of the clamping disc referred to as the lower position.

During the upward movement of the clamping plate 32 presses the brake lever 30 facing side of the collar 50 and the surface contour formed there, the brake lever 30 downwards, as shown in FIG. 6 by comparison with the illustration in FIG. 5 stronger deflected torsion spring 36 can be seen. Upon reaching a certain angle in the upward movement of the clamping plate 32, the clamping disc 32 moves past the friction wheel 22 and is held in this position by the leaf spring 38. Of the Brake lever 30 is released and brake lever 30 and torsion spring 36 are in the starting position. Since there is sufficient clearance for the clamping disk 32 in the clamping disk housing 33 upwards, no blocking of the rotational movement of the friction wheel 22 takes place.

FIG. 8 shows a configuration of the braking device with braked drum 12. As soon as the extension of the cable is interrupted, the voltage reached by the withdrawal of the scroll spring 14 acts. With this voltage, the spring 14 tries to rotate the drum 12 in the winding direction and retract the cable again. For a brief moment then rotates the drum 12 and with it the friction wheel 22 in a direction opposite to the previous direction when pulling off the cable direction. Due to the contact between clamping disc 32 and friction wheel 22 caused by the leaf spring 38 and the resulting frictional engagement between contact surface 52 and friction surface 40, the clamping disc 32 is again moved towards the lower position - "the friction wheel 22 would like to return the clamping disc 32 to the lower position take". However, since the brake lever 30 in the in FIG. 7 shown position with its inclined surface 47 of the clamping disc 32 leaves no room for a translational movement, this jammed the friction wheel 22. The movement of the friction wheel 22 and thus the movement of the drum 12, including the winding process, comes to a standstill.

FIG. 9 shows the in FIG. 8 with IX designated section in an enlarged view. The friction wheel 22 takes the clamping plate 32 partially with it and moves it in the slot 48 in the direction of the slide 46 on the brake lever 30th Once the collar 50 of the clamping plate 32 with the Sliding link 46, in particular of the inclined surface 47 comes into contact, the further translational movement of the clamping plate 32 is limited and the clamping disc jammed the friction wheel 22nd

FIG. 10 shows now on the basis of a similar excerpt as in FIG. 9 the clamping plate 32 of the compared to FIG. 9 rear side (back). It can be seen that the clamping disc 32 at least partially circumferentially around the slot 48 on the back has a collar 56. The rear collar 56 is shown in FIG FIG. 10 open to the right side below. In this orientation of the clamping plate 32 results in an opening in the rear collar 56 approximately from a "three o'clock position" to a "six o'clock position".

At the in FIG. 10 illustrated configuration of the braking device clamps the clamping disc 32 still the friction wheel 22. The configuration thus corresponds to the in FIG. 9 illustrated configuration and the clamping plate 32 is with its front collar 50 still on the inclined surface 47 of the link 46 of the brake lever 30 at. The scenery 46 However, in a plane parallel to the inclined surface 47 still comprises a first rectilinear portion 58 and a recessed by comparison and over an edge, here a circular arc portion, connected thereto second rectilinear portion 59th

If so - like this in FIG. 11 is shown - the brake lever 30 is actuated, that is moved against the spring force of the torsion spring 36 down (illustrated by the downward arrow), the rear collar 56 initially slides on the first rectilinear portion 58, whereby the translational position of the clamping disc 32 does not change and thus it remains at the jamming of the friction wheel 22. The translational mobility of the clamping disc 32 changes, however, when the brake lever 30 is pressed further down and then the open portion of the rear collar 56 in the region of transition between the first and second rectilinear portion 58, 59 of the link 46 comes, as in FIG. 12 is shown. Due to the frictional engagement between the clamping disc 32 and the friction wheel 22, which acts against the clamping by the clamping disc 32 due to the spring tension of the spring 14 acts on the clamping plate 32, a force in the direction of the brake lever 30 formed in the gate 46. The open section the rear collar 56 allows, under the influence of this force and against the force of the leaf spring 38, a translational deflection of the clamping disc 32. The force registered by the friction wheel 22 thus displaces the clamping disc 32 as soon as it no longer passes through the link 46, ie its first rectilinear portion Section 58, is supported. Once an edge 60 between the two rectilinear portions 58, 59 is overcome, the clamping disc 32 releases the friction wheel 22 and the friction wheel 22 moves the clamping disc 32, which slides over the brake lever 30, back to the lower position. Is the clamping disk 32 arrived in the lower position ( FIG. 5 ), the drum 12, driven by the scroll spring 14, winds up the entire cable. This process can be interrupted by a short pull on the cable. When pulling the clamping disc 32 moves back to the upper position ( FIG. 7 ) and blocks the friction wheel 22 (FIG. FIG. 8 ).

FIG. 13 and FIG. 14 waiving a further explanation of the details already described, the effect of the synchronizing brake 42 (FIG. FIG. 3 ), namely the brake arms 44, which together with an inside of the friction wheel housing 20 form a constant velocity or centrifugal brake. In general, this constant-velocity brake 42 may be referred to as a brake 42 contacting the friction wheel housing 20 under the influence of centrifugal force. In the illustrated embodiment, the friction wheel 22 comprises a circumferential friction surface 40 and in a direction parallel to the friction surface 40 at least one under centrifugal force an inner side of the Reibradgehäuses 20 contacting brake arm 44. The brake arm 44 is resiliently mounted for this purpose or has a under centrifugal force elastically deformable portion. Such an elastically deformable portion is in the two illustrated brake arms 44 by a flattened portion of the brake arm 44 and the Material properties formed. Following the flattened portion is a the end of the respective brake arm 44 forming, in particular thickened portion which is provided at the influence of centrifugal force for contacting the inside of Reibradgehäuses 20 and causes a limitation of the rotational speed of the friction wheel 22 due to the then resulting frictional engagement. FIG. 14 shows as enlargement of the representation in FIG. 13 From a slightly different perspective, indicated by the two outwardly directed arrows movement of the brake arms 44 in centrifugal force, namely in the direction of the inside of Reibradgehäuses 20. Die in FIG. 13 shown with the partially cut portion kinematic connection between the friction wheel 22 and cable drum 12, namely in the form of intermeshing teeth of drum gear ring 26 and Reibradzahnkranz 24 causes a caused by the centrifugal force or constant velocity brake reduction or limitation of the rotational speed of the friction wheel 22 directly also a limit the rotational speed of the drum 12th

LIST OF REFERENCE NUMBERS

10

Cable drum unit

12

cable drum

14

Driving device / coil spring

16

drum bearing

18

Roll spring bearing

20

Reibradgehäuse

22

friction wheel

24

Reibradzahnkranz

26

Drum gear

28

circumferential bridge (on the drum)

29

cable outlet

30

brake lever

32

clamping disc

34

Axle (for the clamping disc)

35

guide element

36

torsion spring

38

leaf spring

40

friction surface

42

Synchronization brake

44

brake arm

46

scenery

47

sloping surface

48

Long hole

50

Collar (on the clamping disc)

52

contact area

54

connecting line

56

(back) collar (on the clamping disc)

58

first rectilinear section

59

second rectilinear section

60

edge

Claims (16)

1. Cable reel unit (10) for a vacuum cleaner, comprising a cable reel (12) for a connecting cable of the vacuum cleaner and comprising a drive device (14) for rotating the cable reel (12), comprising
   a braking means (22, 32) by means of which rotatability of the cable reel (12) is prevented or released, and
   an actuating element (30) by means of which the braking means (22, 32) is deactivated and the drive device (14) is actuated,
   a pivotable clamping plate (32) and a frictional wheel (22), which can rotate with the cable reel (12), acting as the braking means (22, 32),
   the clamping plate (32) clamping the frictional wheel (22) in a first orientation,
   characterised in that,
   in addition to being pivotable, the clamping plate (32) can also be moved in a translational manner and, when the translational movability thereof is orientated in a particular manner, is guided on a motion link (46) formed in the actuating element (30).
2. Cable reel unit according to claim 1, wherein the frictional wheel (22) is clamped to the clamping plate (32) automatically by means of the frictional wheel (22) as a result of the drive device (14) acting at least indirectly on the frictional wheel (22).
3. Cable reel unit according to either claim 1 or claim 2, wherein the clamping plate (32) comprises a contact face (52), which faces away from the pivot axis of the clamping plate and faces the frictional wheel (22), for contacting the frictional wheel (22),
   wherein, when winding up the connecting cable, the contact face (52) can be transferred by means of the frictional wheel (22) into a position which, in a rotational direction of the frictional wheel (22), lies above a connecting line (54) extending between a rotational axis of the frictional wheel (22) and the pivot axis of the clamping plate (32), and
   wherein, when the braking means (22, 32) are deactivated, the clamping plate (22) is released and can be transferred into a position below the connecting line (54).
4. Cable reel unit according to claim 1, 2 or 3, wherein the clamping plate (32), in its first orientation and when the frictional wheel (22) is clamped, is supported on the motion link (46) formed in the actuating element (30).
5. Cable reel unit according to claim 4, wherein the clamping plate (32) comprises an elongate slot (48).
6. Cable reel unit according to claim 5, wherein the clamping plate (32) comprises on a front side, around the edge of the elongate slot (48), a front-side collar (50) with which the clamping plate (32), in the first orientation when the frictional wheel (22) is clamped, is supported on the motion link (46) formed in the actuating element (30).
7. Cable reel unit according to either claim 5 or claim 6, wherein the clamping plate (32) comprises on a rear side, around the edge of the elongate slot (48), a rear-side collar (56) which, when the actuating element (30) is actuated, cooperates with a motion link (46) formed in the actuating element (30) such that, with progressive actuation, the clamping plate (32) can be moved in a translational manner.
8. Cable reel unit according to claims 6 and 7, wherein the motion link (46) is formed in the actuating element (30) in two planes in the direction of the longitudinal extent of the actuating element (30), and wherein the motion link (46) comprises, in a first plane, an oblique face (47) for cooperation with the front-side collar (50) and, in a second plane, parallel to the first plane, comprises a first straight portion and a second straight portion (58, 59), set back from the first portion, for cooperation with the rear-side collar (56).
9. Cable reel unit according to claim 8, wherein a transitional region between the first and the second straight portion (58, 59) of the motion link (46) lies above the oblique face (47) in the actuation direction of the actuating element (30).
10. Cable reel unit according to any of the preceding claims, wherein a spring element (38) holds the clamping plate (32) in contact with the frictional wheel (22).
11. Cable reel unit according to claims 6 and 10, comprising a stop, formed on the front-side collar (50), for acting on the spring element (38).
12. Cable reel unit according to any of the preceding claims, wherein a brake (42), which is in contact with a frictional-wheel housing (20) under centrifugal force, is associated with the frictional wheel (22).
13. Cable reel unit according to claim 12, wherein the frictional wheel (22) comprises a circumferential frictional surface (40) and, in a plane parallel to the frictional surface (40), at least one brake element (44), which is in contact with the inner face of the frictional-wheel housing (20) under centrifugal force, as a brake (42).
14. Cable reel unit according to any of the preceding claims, wherein the drive device (14) is in the form of a scroll spring (14).
15. Cable reel unit according to any of the preceding claims, wherein the actuating element (30) is mounted so as to be spring-loaded and is in the form of a means for releasing the braking means (22, 32) which act indirectly on the cable reel (12).
16. Vacuum cleaner comprising a cable reel unit according to any of the preceding claims.

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