EP2944245B1 - Floor cleaning device - Google Patents

Description

The invention relates to a floor care device as Bürststaubsauger with a bottom facing Bürstvorsatz for receiving a driven brush roller with an overload protection, wherein the brush attachment is connected via a pivotable connecting element as a connecting piece for an attachable filter housing with a handle as a handle via corresponding connections and the brush attachment has at least one electric motor for a suction fan and for driving the brush roller and the brush roller is associated with a unit for torque detection and a safety shutdown via a releasable switching unit above a torque threshold occurs by overload.

It is known to form safety devices for brush vacuum cleaners, which perform a mechanical or electronic decoupling in case of overload and blocking of the driven brush roller. Here, it is provided either by slipping a frictionally arranged belt to drive through a built-in slip or ratchet coupling with a controller that monitors the performance of the drive to perform an electronic shutdown or electronic shutdown via a torque measurement and - evaluation by microcontroller with subsequent electronic triggered shutdown of the electric drive. Especially in devices with only one motor for fan and brush drive this is very expensive and costly to solve, to ensure a long life and reliability. Prior art is in the US 5 056 175 A the applicant in the US 5 555 962 A , of the EP 0 394 641 A1 , of the WO 99/29223 A1 and in the DE 10 304 579 A1 shown.

The object of the invention is to improve a mechanical torque detection of a motor for generic Bürststaubsauger to to operate an associated trigger mechanism and to ensure a good functioning.

The solution of this object is achieved according to the invention in that the unit for torque detection formed by a drive pulley and is rotatably mounted on a shaft, wherein the shaft has a rotationally fixed output element to the brush roll and the drive pulley is coupled via a torsion spring with a clutch disc, the axially on the Shaft displaceable and rotatably coupled via driver with the shaft, wherein ramps are formed on the drive pulley, which axially adjust the clutch disc with corresponding ramps by relative rotation above a torque threshold, and a safety shutdown is controlled by the adjusting movement via a corresponding switching element of a circuit arrangement.

As a result, a compact, low-wear unit for mechanical torque detection and control of switching elements is created. At the same time damping is carried out by the torsion spring, in particular for the belt drives of the system, in order to compensate shock loads. In addition, time delays are allowed for the actuating movement of the clutch disc to compensate for torque peaks.

It is provided that the circuit arrangement is arranged as an electrical switch, reed contact, light barrier or mechanical spring-loaded switch for switching off the motor.

A simple solution of a circuit arrangement is that a trigger element which can be coupled with the clutch disc is formed by an eddy current disc rotatably coaxial with the shaft, which transmits a force from the rotating system to a stationarily arranged switching element with associated magnets and triggers a switching operation for the safety shutdown of the motor ,

A compact design is created in that the drive pulley has a cup-shaped receptacle for the torsion spring, clutch disc with driver and the ramps.

It is also proposed that the coupling disc has a shoulder which carries frontal ramps and has an axially aligned slot for receiving the driver as a pin for coupling to the shaft.

To increase a tilt lock of the drive pulley is provided that the drive pulley is also rotatably and axially displaceably mounted on the approach of the clutch disc with the interposition of associated sockets.

To improve the reliability is proposed that the sliding clutch disc is associated with a return spring as a counterforce to the ramp rise.

Fig. 1

einen Bürststaubsauger mit einem Bürstvorsatz und einem aufgesetzten Filtergehäuse,

Fig. 2

eine Schnittdarstellung einer Einheit zur Drehmomenterfassung mit einer Schalteinrichtung,

Fig. 3

eine schaubildliche Darstellung der Einheit zur Drehmomenterfassung entsprechend Fig. 2,

Fig. 4

eine perspektivische Darstellung einer Kupplungsscheibe mit Drehfeder auf der Welle mit einem Langloch im Ansatz für den Mitnehmer zur Wellenkopplung,

Fig. 5

einen Bürstvorsatz in perspektivischer Darstellung mit einer Einheit zur Drehmomenterfassung und Schaltelementen und

Fig. 6

eine Seitenansicht einer Wirbelstromscheibe mit zugeordnetem Schwenkhebel als Schaltelement.

In the drawing, an embodiment of the invention is shown schematically. Show it:

Fig. 1

a brush vacuum cleaner with a brush attachment and an attached filter housing,

Fig. 2

a sectional view of a unit for torque detection with a switching device,

Fig. 3

a perspective view of the unit for torque detection accordingly Fig. 2 .

Fig. 4

a perspective view of a clutch disc with torsion spring on the shaft with a slot in the neck for the driver for shaft coupling,

Fig. 5

a brush attachment in perspective with a unit for torque detection and switching elements and

Fig. 6

a side view of an eddy current disc with associated pivot lever as a switching element.

In a brush vacuum cleaner shown a brush attachment 1 is connected via a pivotable connecting element 3 as a connecting piece with an attachable filter housing 2. The brush attachment 1 has an electric drive not shown with a drive pinion 4 for a brushing roller 5 via a drive train 6, 7 and at the same time for a likewise not shown suction fan. In the drive train 7 to or for the brushing roller 5, a slip clutch is arranged in a conventional manner.

In the drive train 6, 7 a co-rotating drive pulley 8 of a unit 9 for mechanical torque detection on a shaft 13 is arranged. Here, when a torque threshold is exceeded by overload by a switchable or extendable coupling element 10 as a disk element of the unit 9 for torque detection, an associated Rotationsköper acted as eddy current disc 11. The eddy current disc 11 is coupled via a bearing 12 concentrically on the shaft 13 with the drive pulley 8 and the driven coupling element 10 of the torque detection unit 9 via a contact surface as a slip-poor connection.

To carry out a switching operation, a movable carrier is associated as a stationary mounted pivotable lever 14 parallel to the eddy current disc 11, which carries a magnet 15 in the outer region to form an eddy current.
Here, the rotational path of the lever 14 and the plane of rotation of the eddy current disc 11 runs approximately parallel.

When the torque threshold is exceeded, the eddy current disc 11 is thus driven via the coupling element 10. In this case, a force is exerted on the pivotable lever 14 by the magnetic field generated by the generated magnetic field via the magnet 14 arranged on the lever 14, which is thus pivoted and by a Connected release arm 16 is actuated by a trigger mechanism 17, a switch 18 for switching off the drive 4.

In this embodiment, the torque-detecting unit 9, which is switched on in the drive train 6, 7, is combined with a reduction gear. The shaft 13 has a rotatably connected to it output element 28 for or to the brush roller. 5

To form the unit 9 for torque detection, the drive pulley 8 is arranged immovably rotatable via a bearing on the shaft 13. The associated clutch disc 10 is slidably mounted on the shaft 13 and coupled via a driver 19 with the shaft 13. The clutch disc 10 has an engaging in the region of a receiving space formed the drive pulley 8 approach 22 which is enveloped by a sleeve 20 and a sleeve 21 of the drive pulley 8 is associated. The projection 22 has an arranged in the direction of the shaft axis slot 27 into which engages the driver 13 connected to the shaft 13 in the form of a pin. The drive pulley 8 and the clutch disc 10 are coupled to form a torque detection via a torsion spring 23 which is fixed to each of the drive pulley 8 and the clutch disc 10.

The connection between the drive pulley 8 and the clutch disk 10 for driving the shaft 13 thus takes place via the torsion spring 23. When a torque threshold is exceeded, the clutch disk 10 is rotated relative to the drive pulley 8 against the force of the torsion spring 23.

The drive pulley 8 and the clutch disc 10 have associated ramps 24, 25 which displace the slidable clutch disc 10 by twisting each other when the torque threshold is exceeded against the force of an associated return spring 26 and return the clutch disc 10 to its initial position after a shift operation.

By the adjusting movement of the clutch disc 10 to the outside then a corresponding release mechanism 17 with a switch 18 for switching off a driven drive pinion 4 is feasible. In this case, the aforementioned shutdown via a release arm 16 of a pivotable lever 14 through the coupling eddy disc 11 is made. Of course, any other circuit can be triggered by the adjusting movement of the clutch disc 10.

Disclosed is a floor care device as Bürststaubsauger, with a bottom facing Bürstvorsatz for receiving a driven brush roller with an overload protection, wherein a drive disk is rotatably mounted on a shaft and the shaft has a rotationally fixed output element to the brushing roller, and the drive pulley via a torsion spring with a clutch disc is coupled, which is axially rotatably coupled to the shaft and rotatably connected via driver with the shaft, and ramps are formed on the drive pulley, which axially adjust the clutch disc with corresponding ramps by relative rotation above a torque threshold, and by the adjusting movement via a corresponding switching element a circuit arrangement a safety shutdown is controllable.

Claims (7)

1. A floor care appliance in the form of a brush vacuum cleaner, comprising a brush set (1) facing the floor for receiving a driven brush roller (5) with an overload protection, wherein the brush set (1) is connectable via a pivotable connecting element in the form of a connecting piece for an attachable filter housing to a handle in the form of a hand grip via corresponding connections, and wherein the brush set (1) has at least one electric motor for a suction fan and as a drive for the brush roller (5) to which is assigned a unit for torque detection, wherein a safety shut-off is carried out via a switching unit that can be triggered by overload above a torque threshold, characterized in that the unit (9) for torque detection is formed by a drive disk (8) and is rotatably mounted on a shaft (13), wherein the shaft (13) has a rotationally fixed output element (28) to the brush roller (5), and the drive disk (8) is coupled via a torsion spring (23) to a coupling disk (10) which is displaceable axially on the shaft (13) and is coupled in a rotationally fixed manner to the shaft (13) via drivers (19), and ramps (24) are formed on the drive disk (8), which ramps, above a torque threshold, axially adjust the coupling disk (10) with corresponding ramps (25) by relative twisting, and a safety shut-off can be controlled via the adjusting movement via a corresponding switching element (18) of a switching arrangement (14, 16, 17).
2. The floor care appliance according to claim 1, characterized in that the switching arrangement (14, 16, 17) is arranged in the form of an electric switch, a reed contact, light barrier or mechanical springloaded switch for switching off the motor.
3. The floor care appliance according to claim 1 or 2, characterized in that a trigger element that can be coupled to the coupling disk (10) is formed by an eddy current disk (11) which is arranged coaxially and rotatably on the shaft (13) and which, by means of associated magnets (15), transmits a force from the rotating system to a stationarily arranged switching element (14) and triggers a switching operation for a safety shut-off of the motor.
4. The floor care appliance according to any one of claims 1 to 3, characterized in that the drive disk (8) has a cup-shaped receptacle for a torsion spring (23), a coupling disk (10) with drivers (19) and the ramps (24, 25).
5. The floor care appliance according to any one of claims 1 to 4, characterized in that the coupling disk (10) has an attachment (22) that carries ramps (25) on the front side and has an axially oriented oblong hole (28) for receiving the driver (19) in the form of a pin for coupling to the shaft (13).
6. The floor care appliance according to any one of claims 1 to 5, characterized in that the drive disk (8) is additionally mounted on the attachment (22) of the coupling disk (10) in a rotationally and axially displaceable manner through interposition of associated bushes (20, 21).
7. The floor care appliance according to any one of claims 1 to 6, characterized in that the movable coupling disk (10) is provided with an associated return spring (26) as a counterforce to the ramp rise.

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