GB2238954A

GB2238954A - Vacuum cleaner

Info

Publication number: GB2238954A
Application number: GB9023558A
Authority: GB
Inventors: Anders Einar Clemens Larsson; Holmer Kuno Ristau; Leif Erik Edlund; Lars Gunnar Tuvin; Lars Gunnar Kilstrom
Original assignee: Electrolux AB
Current assignee: Electrolux AB
Priority date: 1989-11-29
Filing date: 1990-10-29
Publication date: 1991-06-19
Also published as: JPH03182224A; DE4037903A1; GB9023558D0; SE8904025D0

Abstract

A vacuum cleaning nozzle for floor cleaning comprises a movable brush 12 which is adjustable between operative and inoperative positions, and means for adjusting the brush between the positions. The adjusting means comprises an electric motor 15 which via a reduction gear 16 and an excenter or crank mechanism 14 actuates the brush to provide the adjusting movement. <IMAGE>

Description

1 8 1.

Nozzle for vacuum cleaner The present invention relates to a vacuum cleaning nozzle for floor cleaning comprising a housing and a brush movable in the housing between operative and inoperative positions, and means for adjusting the brush between said positions.

Vacuum cleaning nozzles of this kind are generally adjusted by means of a pedal provided on the top side of the nozzle. The disadvantage of this arrangement is that the adjustment requires a relatively great force on the pedal, particularly in those cases when the pedal is journalled in the portion of the nozzle raised during the brush adjustment since in such case the pedal force counteracts the adjusting movement.

The object of the present invention is to provide a vacuum cleaning nozzle the handling of which has been facilitated in that the required control force has been minimized. This has been achieved by means of a nozzle of the kind mentioned in the introduction which according to the invention is characterized in that the adjusting means comprises an electric motor, a reduction gear, and an excenter or crank mechanism, said mechanism being actuated by said motor via said reduction gear to provide the adjustment of the brush.

The invention will be described in more detail in the following with reference to the accompanying drawings on which Figures 1 and 2 illustrate diagrammatical longitudinal sections of the vacuum cleaning nozzle according to the invention in two different positions, Figure 3 is a bottom plan view of the same nozzle, with the movable brush removed, and Figure 4 illustrates a circuit diagram.

The nozzle illustrated in the drawings comprises a housing 10 having a suction air passage 11 extending therethrough and adapted to be connected to a suction tube (not shown). In the lower portion of the housing a vertically movable brush 12 is provided which is actuated by a spring (not shown) to assume its upper, inoperative position, as shown in Figure 1.

For the adjustment thereof the brush 12 is actuated by a U-shaped yoke 13 which is in turn actuated by an excenter 14 cooperating with one of the two legs 13a of the yoke. The excenter 14 is via a reduction gear 16 opertively connected to a power drive means in the form of an electric motor 15. Instead of the excenter 14 a crank mechanism may be used, as is easily understood.

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2.

For the adjustment of the brush 12 from the position shown in Figure 1 to the operative position in Figure 2 the excenter 14 is rotated one half revolution. The rotation of the excenter is controlled by means of a limit switch rotating with the excenter. The limit switch comprises a circular disc 17 made of electrically conductive material and provided with two diametrically opposite,insulated areas 18 (Figure 4). Two sliding contacts 19 are connected to the circuit of the motor 15 and cooperate with the disc 17.

In the position shown in Figure 4 the current circuit across the limit switch is open. When the position of the brush 12 is to be adjusted, the circuit is closed by means of a switch 20 which is normally open and which is conntected in parallel with the limit switch. The motor 15 is thereby activated and the excenter 14 and the disc 17 begin to rotate, whereby the circuit is closed by the limit switch, and the switch 20 need not be maintained in its closed position. After having rotated one half revolution the limit switch again opens the circuit whereby the rotation stops and the brush 12 remains in its new position.

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Claims

C 1 a i m s

1. Vacuum cleaning nozzle for floor cleaning comprising a housing (10) and a brush (12) movable in the housing between operative and inoperative positions, and means for adjusting the brush between said positions, c h a r a c t e r 1 z e d in that the adjusting means comprises an electric motor (15), a reduction gear (16), and an excenter or crank mechanism (14), said mechanism being actuated by said motor via said reduction gear to provide. the adjustment of the brush.

2. Vacuum cleaning nozzle according to claim 1, characterized in that the adjusting means comprises a manually actuatable switch (20) for closing the circuit of the motor (15), and a limit switch (17, 18) for opening said circuit when the brush (12) is in its operative or inoperative position.

13 Published 1991 at 'The Patent Office. State House. 66/71 High Holborn. London WC1R47P. Further coplesmay be obtained from Sales Branch. UnAt 6. Nine Mile Point. Cwmfelinfach, Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques lid. St Mary Cray, Kent.