Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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APPLIANCE FOR FLOOR CARE
The invention relates to an appliance for floor care having a driven
care insert, such as for example a polisher disc, mounted on a carrier
disc, and a special front or corner brush, which is releasably
engageable, a drive for the brush being effected after engagement by
means of the rotating carrier disc, the carrier disc being mounted on
an appliance housing by provision of a bearing pin.
An appliance for floor care formed in this manner is known from German
published Patent Specification No. 4 110 682. In this, a brushing and
polishing machine for floor servicing is shown, which is provided on
its underside with three brushing or polishing discs, these being
driven in common by means of an electric motor. This appliance is
provided with corner brushes in the two forward corner regions, each
corner brush being disposed on an angular lever or arm which is
pivotable against a spring force. On impact of a moveable portion of
the housing in the form of a front apron, the extra brushes are brought
into engagement against the respective adjacent brush or polisher disc,
so that the supplementary brushes are engaged.
It is an object of the present invention to realise in an improved
manner an appliance of this kind for floor care, in such a way that the
drive behaviour of the appliance is not exposed to any negative effects
by introduction of an external force.
This object is met by the invention defined in the main claim.
The subsidiary claims set out advantageous further embodiments.
As a result of this realisation, there is provided an appliance for
floor care having a driven insert mounted on a carrier disc and a
special front or corner brush, the device in its drive characteristics
not being exposed to any negative influences by introduction of
external force. This is achieved in that on engagement of the brush, a
line of action of the pressing force between a drive wheel acting on
the brush and the carrier disc extends through the axis or at a close
spacing to the axis. The pressing point between the drive wheel
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associated with the brush and the carrier disc, and the direction in
which the drive wheel acts on the carrier disc, are set out so that a
resultant force direction extends through the axis of the carrier disc
or at a close spacing to this axis. It is thus ensured that on
engagement of the brush, no negative effects are applied to the carrier
disc. This means that in the region of the axis of the carrier disc,
no turning moments are introduced which would bring about any negative
effects on the behaviour of the carrier disc, or only very small
turning moments. This is particularly advantageous in the case of
appliances which have carrier discs with their point of rotation on
pivotably disposed rocker arms or levers, which in turn are mounted on
a bearing pin in the housing. These rocker arms are urged by springs
about their respective axes against one another or against a motor
pinion. In the known embodiment mentioned initially, the force
resulting on engagement of the brushes acts at a spacing distant from
the carrier disc associated with this brush. This has the result that
a relatively great turning moment acts on the rocker arm of the carrier
disc, which leads to a reduction in the-pressing force between carrier
disc and the motor pinion. A uniform drive of the carrier discs is
thus not provided in the engaged condition of the brush as compared
with the disengaged condition of the brush. The invention by contrast
proves to be especially advantageous also in this regard, that the line
of action of the pressing force, as already mentioned, extends through
the axis of the rocker arm or at a close spacing to this axis. There
exists therefore no turning moment, or only an extremely small turning
moment, to act in a negative manner on the pressing force between
carrier disc and motor pinion. The engagement of the brush brings
about therefore no slip, so that the carrier discs operate continuously
at the same speed, independently of whether or not the brush is engaged
or disengaged. By this arrangement, it is ensured that the pressure
forces between the carrier discs and the motor pinion are not changed
by engagement of the brush. This also means that no increase results
in the pressure forces between a carrier disc and the motor pinion,
which would lead to increased wear of the components. The construction
is advantageously so selected that the force resultant extends at a
maximum spacing of approximately one-eighth of the diameter of a
carrier disc with respect to the axis of the carrier disc. By this
spacing there is to be understood the path extending through the axis
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at right angles to the optimal line of action of the force, this path
corresponding approximately to one-eighth of the diameter of the
carrier disc and extending, proceeding from the axis, to both sides of
the optimal line of action of the force. By this there results a
scissors-shaped or divergingly tapering region running from the
pressing point of the drive wheel for the brush on the carrier disc
into the region of the axis, in which scissors-shaped region, the force
resultant extends. The amount of the spacing is so small that no
negative influences are applied to the carrier disc, and in particular
no turning moments acting negatively upon the carrier disc. In an
advantageous further embodiment of the subject of the invention, it is
provided that the engagement of the brush is achieved by means of a
tension spring acting on the drive wheel. When the appliance meets up
with an object, for example an article of furniture or the like, the
brush is moved in a direction towards the carrier disc by means of a
tension spring acting on the drive wheel, after which the carrier disc
drives the drive wheel for the brush. The brush is thus engaged. In
the previous state of the art, the engagement of the brush is effected
by means of a compressive spring disposed between the drive wheel and
the moveable part of the appliance housing. This has the disadvantage
that in the event of excessive impact on the movable housing portion,
the compressive spring bottoms or is fully compressed and thus the
maximum pressure force is transferred onto the drive wheel. This leads
to an excessive load on the carrier disc, which is therefore adversely
affected in its drive characteristics. Furthermore, there is
introduced by this, excessive wear of the carrier disc which is
provided for example with a resilient or rubber surface. This is not
the case for the present invention. For this, it is by contrast the
case that excessive forces, which come about especially in the event of
a heavy bump of the appliance against an article of furniture or the
like, are almost completely absorbed by the tension spring. This
concept is of independent importance in regard to the object of the
present invention. The formation of a front or corner brush, in which,
on engagement, the line of action of the pressing force extends through
the axis of the carrier disc or at a close spacing to this axis, and in
which the engagement of the brush is effected by means of a tension
spring, is an optimal solution in regard to the drive conditions.
Furthermore, it is provided in the case of an appliance of this kind
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for floor care, the engagement of the brush being actuatable by an
impact of the moveable coupling portion in the region of the brush of
the appliance, that the coupling portion is mounted on a pivot axis
disposed substantially at right angles to the direction of engagement.
This coupling portion may be for example a circular projection in one
of the front corner regions of the appliance, which is pivotably
mounted in the housing of the appliance. When the appliance is pushed
against an article of furniture or the like, there is impact on the
coupling portion, which now moves about the pivot axis and thus
actuates the engagement of the brush. Advantageously the brush is for
this purpose disposed in the region of this coupling portion. It is
envisaged that a pot-shaped coupling portion is provided with the brush
disposed therein. In order to engage the brush of the device, it is
further provided that the tension spring is fixedly secured at one end
to the coupling portion and that at the other end it acts on a
connecting rod between the drive wheel and the brush. On impact of the
coupling portion, for example by meeting a skirting board, an article
of furniture or the like, the coupling portion pivots about its axis of
rotation and brings along with it, by means of the tension spring, the
connecting rod between the drive wheel and the brush into an engaged
position. Advantageously, this connecting rod is in this regard
likewise mounted to be pivotably displaceable, a pivotal movement
effecting a pivoting of the drive wheel in the direction of the carrier
disc. In an advantageous further embodiment, it is in this regard
provided that the tension spring acts on the connecting rod in the
engaged and disengaged condition of the brush under pre-stressing. In
this manner, the pressing force of the drive wheel on the drive disc is
predefined for the avoidance of slip and wear. The pressing force
between the drive wheel and the carrier disc is always predetermined at
a minimum value. The maximum pressing force is established by the
spring characteristic selected. This embodiment is optimised by the
pre-stressing of the tension spring being taken up by a tension
portion. This tension portion is mounted on the moveable coupling
portion and carries the prestressed tension spring, which acts on the
connecting rod between the drive wheel and the brush. In this regard,
a connecting end projects in advantageous manner outwardly beyond the
tension portion. This connecting end engages advantageously on the
connecting rod in a manner such that the connecting rod has a pin,
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about which the connecting end of the tension spring engages. In order
to assure trouble-free operation during pivoting of the coupling
portion, it is provided that the tension portion is pivotably mounted
on the coupling portion. In an advantageous further embodiment of the
subject of the invention, there is provided in the case of an appliance
of the present kind for floor care, the appliance having a peripheral
suction chamber sealing strip, for example in the form of a row of
brushes, which by endwise engagement against a floor leads to sealing
of the suction chamber, that seepage openings are formed in the sealing
strip, in each case associated with a downwardly directed suction
opening of the appliance, the seepage/open~lngs each being formed by a
recess in the sealing strip in this region, the recess having a height
which corresponds to a fraction, for example one half, of the height of
the sealing strip. In the case of treatment of a floor, for example a
parquet floor, particles are loosened and sucked away by means of one
or more polishing discs. These particles may be particles of dust, but
there may also be released particles of polish wax or the like. In
order to intercept or catch the particles which are accelerated
outwardly by the centrifugal force, the appliance has a peripheral
suction chamber sealing strip, for example in the form of a series of
brushes. These form therefore a closed suction chamber underneath the
floor care appliance, this sealing strip surrounding the polishing
discs mounted on the carrier discs. In order to increase the suction
effect of the appliance, the suction chamber sealing strip is provided
with seepage openings in the region of a suction opening of the
device. In a favoured embodiment, the appliance has three polishing
discs arranged in a triangle, each mounted on a carrier disc, two
polishing discs being mounted in the front region of the appliance
beside one another and one polishing disc being mounted in the rearward
region of the appliance. In this regard, two downwardly directed
suction openings for the device are provided, each of which is locateOdr alrflowin the angle region between a front and a rear polishing disc. Seepage/
openings in the suction chamber sealing strip are thus associated with
each suction opening of the appliance. The arrangement is in this
regard so formed that the particles released during the polishing
operation are moved into the region of the downwardly directed suction
openings, following which these particles are carried away through the
suction openings by means of the strengthened flow of air brought about
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by the seepage openings. The flow of air is in this regard so great
that the outwardly accelerated particles are not able to pass through
the seepage openings. A sucking away of the released particles is
accordingly achieved in optimal manner. On the one hand, these
particles are not able to pass to the exterior, that is outside the
suction chamber, since they are caught by the suction chamber sealing
strip. On the other hand, the suction effect is increased exactly in
the region into which the released particles enter. The formation of
the suction chamber sealing strip in the form of a row of brushes is
especially of advantage in that by this a double effect is provided.
The row of brushes prevents on the one hand the exit of the particles
from the suction chamber, and on the other hand there is given by this
a uniform flow of air downstream of the seepage openings, the speed of
the air flowing in this downstream region being substantially less than
the speed of air flow in the region of the seepage openings of the
sealing strip. Finally, it is thus possible to arrange in the simplest
manner that the sealing strip is provided with recesses which,
proceeding from the floor, extend to approximately one half of the
height of the sealing strip. In the case of the embodiment of the
sealing strip in the form of a row of brushes, the brushes are in this
regard formed in the most simple manner to be shortened in the region
of the seepage openings. In a preferred embodiment, it is provided
that the width of the seepage opening is approximately in the region of
two thirds to four thirds of the sealing strip. Optimal flow
conditions are for example then given when the height of the seepage
opening is approximately in the region of one quarter to three quarters
of the height of the sealing strip. The height of the sealing strip
relates to the visible height from the exterior. Finally, it is of
further advantage for four to eight seepage openings in the sealing
strip to be associated with one suction opening of the appliance. In
this manner, the sucking away of the particles is optimally achieved in
the most simple manner.
The subject of the invention is subsequently described in more detail
having regard to an exemplary embodiment shown in the drawings.
Figure 1 is a front view of a vacuum cleaner provided with an appliance
according to the invention for floor care,
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Figure 2 shows the appliance according to the invention in a
representation on its own, and in a side view,
Figure 3 shows the appliance in a view from above,
Figure 4 shows the floor care appliance in a perspective view from
below,
Figure 5 is a further view of the appliance from below,
Figure 6 is a representation corresponding to Figure 5, with however
polisher discs and base plate removed, a carrier disc being here
partially cut-away for better representation,
Figure 7 is a detailed representation of a corner region, derived to anenlarged scale from Figure 6, a corner brush being here shown in
disengaged condition,
Figure 8 is a further enlargement of the corner region according to
Figure 7,
Figure 9 is a representation following on Figure 8, the corner brush
being here engaged,
Figure 10 is a perspective representation of the region according to
Figure 8, with however housing and coupling portion omitted,
Figure 11 is a representation corresponding to Figure 7, relating
however to the situation according to Figure 9,
Figure 12 is a representation following on Figure 9,
Figure 13 is a sketch showing the principles relating to force transfer
on impact of the coupling portion disposed in the corner region, which
effects engagement of the corner brush, and
Figure 14 is an exploded perspective view of the component parts of the
corner brush drive.
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There is shown in Figure 1 an electrical vacuum cleaner 1 formed as a
hand appliance. This consists of a housing 2, to which there is
connected from above a handle 3, the handle 3 having a gripping portion
4 at its end. In the transition region between gripping portion 4 and
handle 3, there is an on and off switch 5. The connection for the
electrical cable is indicated by the reference numeral 9.
The housing 2 is divided into a motor housing 6 and a chamber 7
extending upwardly above the housing 6 for receiving a vacuum filter
bag, not shown. The blower of the motor is likewise not shown in
detail in the drawings.
The motor housing 6 changes on its underside into a tubular coupling 8,
which forms the airflow connection to a floor care appliance G.
In regard to the floor care appliance G, there is in question a
polishing device or so-called floor polisher appliance, which has three
carrier discs 10 driven in common. These latter extend inwardly into
the housing, sunk in behind a base plate 11 which is insertable into
the housing, and which has openings 12 cut out of it which correspond
in shape to the carrier discs.
A care insert in the form of a floor polisher disc 13 is associated
with each of the individual carrier discs 10 by way of a clip
connection. There is in question a demountable clip connection.
The drive of the carrier discs 10 takes place by means of a motor
pinion 14. The carrier discs 10 are for this purpose provided on their
radially outer peripheries with a resilient-type annular bearing
surface 15. The arrangement of the carrier discs 10 within the housing
16 of the floor care appliance G is so arranged that the annular
bearing surface 15 of one carrier disc 10 abuts against the annular
bearing surfaces 15 of both of the other carrier discs, the annular
bearing surfaces 15 of both of these other carrier discs 10 engaging
radially against the motor pinion 14. The electrically driven motor
pinion 14 thus effects a uniform rotating action on all three carrier
discs 10.
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Each carrier disc 10 is mounted on a rocker lever or arm 17, which i5
pivotably mounted in the housing by means of a pin 18. The three
carrier discs 10 are urged against one another and against the motor
pinion 14 by way of these pivotable rocker arms 17 by means of tension
springs 19 disposed in the housing 16. There therefore results at all
times an urging of the carrier discs 10 against one another and against
the motor pinion 14, even in the event of wear occurring on the annular
bearing surfaces 15 over a period of time.
The bulbous housing 16 of the floor care appliance G has an annular
suction channel 20, which at one end changes into a flexible channel
21, channel 21 being in a connectional relationship with the tubular
coupling 8 of the electrical vacuum cleaner 1 by way of a connecting
branch 22. The annular suction channel 20 has three suction openings
23 to 25 directed towards the floor.
The carrier discs 10 are arranged in the form of a triangle, two
carrier discs 10 being disposed to lie adjacent to one another and
perpendicular to the principal direction of movement of the floor care
appliance G, and in the region of the front of the floor care appliance
G. The third carrier disc 10 is correspondingly centrally located in
the rearward region of the floor care appliance G. The suction
openings 23 and 24 are disposed in the wedge-shaped gaps between a
front carrier disc and the rear carrier disc 10. They have a circular
cross-section. The third suction opening 25 is located in the front
region of the floor care appliance G, and is immediately behind the
front wall of the housing, at a small spacing from this wall. This
suction opening 25 has an oblong, slot-shaped configuration. The
removable base plate 11 is provided with corresponding nozzle-form
connectional fittings, so that the suction openings 23 to 25 extend
into this base plate 11. In order to improve the suction effect, the
base plate 11 has outwardly widening, fan-shaped suction slopes 26, 27
in the region of its suction openings 23 and 24.
In the two forward corner regions, the housing 16 of the floor care
appliance G is visibly interrupted, for reception of pivotable coupling
portions 28, which engage corner brushes B on impact.
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As may be seen in particular from Figures 1 to 5, the floor care
appliance G has on the lower side of the base a sealing strip 29 for
the suction chamber which is in the form of a row of brushes and forms
a suction chamber seal to the floor to be serviced. This suction
chamber sealing strip 29 is disposed on the base plate 11 around its
outer edge, corresponding to the shape of the floor care appliance G,
the strip 29 only being interrupted in the region of the pot-shaped
coupling portions 28. There thus results on the one hand a U-shaped
sealing strip 30 and a strip 31 matched to the front shape of the
housing 16, which is disposed at a spacing from the front wall of the
housing. A further brush strip 32 is mounted ahead of this strip 31 in
the principal direction of movement of the floor care appliance G. The
suction opening 25 is formed between the strips 31 and 32. The two
sealing strips 31 and 32 extend in the front region of the housing 16
between the two pot-shaped coupling portions 28.
The strip 32 has a recess 33 which is open at the edge towards the
floor, is located centrally and extends over approximately three
quarters of the length of the strip 32. The height of the recess
corresponds approximately to one half of the height of the bristle
strip 32. The bristles of the bristle strip 32 are therefore formed in
a shortened manner to define the recess 33. This latter serves
principally to enable larger particles of dirt to be passed over in
working w;th the floor care appliance G, these being immediately drawn
away through the suction opening 25 and not passing into the region of
the rotating polishing discs 13. This would lead to damage, and in
particular to scratches in the floor.
In order to raise the suction capability of the floor care appliance G,
the suction chamber sealing strip 30 has seepage openings 34 in the
region of the suction openings 23 and 24. The wax particles or the
like removed during polishing of the floor are accelerated outwardly by
the rotating polishing discs 13 and are then on the one hand prevented
from leaving the suction chamber by the sealing strip 30 of the suction
chamber and on the other hand are sucked away through the suction
openings 2.3 and 24. On account of the increased airflow in the region
AlrflC~' or
of the/seepage openings 34, in part-icular in the region of the suction
slopes 26 and 27, optimal suction of the removed particles is
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achieved. Seepage openings 34 of this kind are provided both in the
rearward region of the floor care appliance G and also in the front
strip 31. The width of each of these seepage openings 34 equates in
this regard to approximately two thirds of the visible height of the
sealing strip 29, the height of the seepage opening 34 corresponding to
approximately one half of the height of the sealing strip 29.
The corner brushes B disposed in the front corner regions of the floor
care appliance G are engageable for improved floor care in the region
of skirting boards, articles of furniture or the like.
A corner brush B of this kind consists generally of several clusters 36
of bristles disposed on a carrier plate 35. A ring gear 37 is disposed
in the carrier plate 35 on the opposite side of the plate from the
clusters 36 of bristles. A bearing pin 38 sits axially in this ring
gear 37 in a press fit. The corner brush B is mounted in a rocker arm
40 by means of the bearing pin 38 and is secured by means of a circlip
41. The rocker arm 40 is formed as a connecting rod 39, the rocker arm
40 being substantially cylindrical in shape in the region of the
bearing for the corner brush B with formation of an annular collar 42.
Proceeding from this cylindrical portion, there extends a lever 43,
which in the region of its free end forms a further cylindrical
receiving portion 44. A radial collar 45 is formed on the cylindrical
receiving portion 44 in extension of the lever 43. In the region of
the lever 43, there is disposed a pin 46 passing through this lever.
A drive wheel 48 is mounted in the cylindrical receiving portion 44 by
way of a bearing pin 47, which is axially secured by means of a circlip
49. At its lower end, the drive wheel 48 has a gear 50 corresponding
to the ring gear 37 of the corner brush B.
The component group consisting of the corner brush B, the rocker arm 40
and the drive wheel 48 is pivotably mounted in the corner region of the
housing 16, clips 51 extending from a surface of the housing gripping
the annular collar 42 of the rocker arm 40. The axis of rotation x of
the corner brush B thus also defines the axis of pivoting of the rocker
arm 40. The axis of rotation of the drive wheel 48 is indicated by
reference y and is, on account of the arrangement selected,
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independently of the pivoting of the rocker arm 40, always spaced at
the same distance from the axis x, meshing between the gear 50 and the
ring gear 37 of the corner brush B being therefore always assured.
The coupling portion 28 has a generally pot-shaped form, which projects
over the housing contour of the floor care appliance G in the corner
regions. This coupling portion 28 is mounted in the region of a
corresponding receiving portion 53 by means of a pin 52. As is to be
seen from Figure 8, the axis of rotation z of the coupling portion 28
stands in the non-engaged condition of the corner brush B at an angle
of approximately 135 to the axis y of the drive wheel 48, relative
to the axis x of the corner brush B. The axis z of the coupling
portion 28 stands substantially vertical to the direction of engagement
of the corner brush B.
The coupling portion 28 has an actuating arm 54 which has a recess 55.
A pivot pin 56 is provided in this recess 55.
A tension portion 57 is located in the recess 55, the tension portion
57 being mounted on the pivot pin 56 by means of a corresponding
receiving portion 58. Axial securing of the tension portion 57 is
achieved by a clip 59, which engages in a corresponding recess in the
actuating arm 54. This recess is so formed that pivoting of the
tension portion 57 in the region of the recess 55 is assured, the path
of the pivoting being limited by the wall of the recess 55.
The tension portion 57 has a tension spring 60, which is inserted under
pre-stressing. At one end, the tension spring engages the receiving
portion 58 of the tension portion 57 by means of a ring-shaped end 61.
At the other end, a connecting end 62 extends outwardly over the
tension portion 57, the tension portion 57 having here corresponding
recesses.
The coupling portion 28 mounted in the housing 16 of the floor care
appliance G surrounds in the region of its pot-shaped profile, the
component group consisting of corner brush B, rocker arm 40 and drive
wheel 48. In this regard, the connecting end of the tension spring 60
projecting from the tension portion 57 engages around the pin 46 of the
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rocker arm 40.
The coupling portion 28 is held in a disengaged position, as is to be
seen in Figure 8, by means of a further tension spring 63, which i5
secured at one end to the housing and at the other end, is engaged in
the region of the actuating arm 54 of the coupling portion 28.
The pivotability of the coupling portion 28 is limited by stops.
When the coupling portion Z8 meets a skirting board, an article of
furniture or the like, the coupling portion 28 is pivoted about its
axis z, so that the tension spring 60 disposed on the actuating arm 54
by means of the tension portion 57 moves the rocker arm 40 about the
axis x. As soon as the drive wheel 48 meets the annular bearing
surface 15 of the carrier disc 10 associated with this corner brush B,
the rotary movement of the carrier disc 10 is transferred to the corner
brush B by way of the drive wheel 48 and the gear connection, so that
this brush also rotates with the carrier disc. If the floor care
appliance G is now moved still further against the obstruction, the
coupling portion 28 is pivoted further about the axis z. The excess
forces engendered by this, which are not to be introduced into the
carrier disc system, are almost completely taken up by the pre-stressed
tension spring 60 (see Figure 12).
On reverse movement of the floor care appliance G away from the
obstruction, reverse displacement of the coupling portion 28 into the
original position takes place by means of the spring 63, the tension
spring 60 in the tension portion 57 being relieved by this and the
rocker arm 40 being displaced back into the starting position about the
axis x by means of the tension portion 57.
In Figure 13, there is shown in schematic representation how the forces
take effect in the carrier disc system on impact of the coupling
portion 28. The impact position is shown here in chain-dotted lines.
On impact of the coupling portion 28 and thus inwardly acting urging of
the drive wheel 48 onto the annular bearing surface 15 of the carrier
disc 10, a pressing force results, which has a line of action running
in optimal manner through the axis 18 of the rocker arm 17. The
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pressing force is designated by reference F. This may however also lie
at a close spacing to the axis 18. This maximum deviation should
however be no more than approximately one eighth of the diameter of the
carrier disc 10. This spacing is designated by reference A in Figure
13. There thus results a region extending from the pressure point P in
a divergent manner similar to a scissors, within which the line of
action of the pressing force F lies.
The location of the rocker arms 17 receiving the carrier discs 10 is so
selected that the forces take effect in the system to correspond to the
rotational moments to be transferred. The axes 18 of the rocker arms
are so arranged that these lie in the line of action of the external
force introduced by the drive wheel system or at a close spacing to the
line of action. It is thus assured that the pressure forces between
the carrier discs 10 and the motor pinion 14 and between two carrier
discs 10 are not changed by the corner brush system. There is thus
- counteraction against any slippage or any increased wear of the annular
bearing surfaces 15 of the carrier discs 10.
The features of the invention disclosed in the present description, the
drawings and the claims may be of importance for the realisation of the
invention both individually and also in any desired combination. All
features disclosed are relevant to the invention. In the publication
- of the application, there is in this regard also to be taken into
account as to their complete content, the disclosure contents of the
associated/accompanying priority documents (copy of the earlier
application).
