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(11) |
EP 0 751 736 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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07.01.1999 Bulletin 1999/01 |
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Date of filing: 13.10.1995 |
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International Patent Classification (IPC)6: A47L 11/40 |
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International application number: |
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PCT/IT9500/167 |
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International publication number: |
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WO 9612/434 (02.05.1996 Gazette 1996/20) |
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A DEVICE FOR THE SELF-LEVELLING AND THE ADJUSTMENT OF THE PRESSURE OF THE FLOOR ROLLER
IN INDUSTRIAL SWEEPING MACHINES
VORRICHTUNG ZUR NIVEAUREGULIERUNG UND DRUCKANPASSUNG EINER KEHRWALZE IN EINER INDUSTRIELLEN
KEHRMASCHINE
DISPOSITIF AUTORISANT LA MISE A NIVEAU AUTOMATIQUE DU ROULEAU-BROSSE SUR UNE BALAYEUSE
INDUSTRIELLE ET LE REGLAGE DE LA PRESSION QU'IL EXERCE SUR LE SOL
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Designated Contracting States: |
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CH DE ES FR GB IT LI NL |
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Priority: |
20.10.1994 IT PR940019 U
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Date of publication of application: |
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08.01.1997 Bulletin 1997/02 |
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Proprietor: Ecologica S.P.A. |
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43012 Fontanellato (IT) |
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Inventor: |
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- CATTANI, Endi
I-43048 Sant'Andrea Bagni (IT)
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Representative: Gotra, Stefano |
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Bugnion S.p.A.
Via Garibaldi 22 43100 Parma 43100 Parma (IT) |
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References cited: :
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- PATENT ABSTRACTS OF JAPAN vol. 018 no. 431 (M-1653) ,11 August 1994 & JP,A,06 128918
(HOWA MACH LTD) 10 May 1994,
- PATENT ABSTRACTS OF JAPAN vol. 018 no. 338 (M-1628) ,27 June 1994 & JP,A,06 081324
(HOWA MACH LTD) 22 March 1994,
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| Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to a device for the self-levelling and the adjustment
of the pressure of the floor roller in industrial sweeping machines as set out in
the first part of each Claim 1 of the appended sets of claims; such a device is known
from JP-A-06 128918 and JP-A-06 081324.
[0002] Prior art industrial sweeping machines foresee the use of rotating rollers which
are provided with brushes for the cleaning of floors or general wide surfaces.
[0003] Generally a sweeping machine includes, a frame to which is fixed the brush roller
in an oscillating way about a horizontal axis in such a way that during the cleaning
operations, the roller is kept in contact with the surfaces to be cleaned as a result
of its own weight-force and so the roller can adapt to the surface to be cleaned and
any possible irregularities of the said surfaces by oscillating about its own suspension
axis.
[0004] In other sweeping machines it is foreseen, in addition to a pneumatic cylinder which
is used for the lifting of the roller during the transporting of the machine, the
use of a nut screw device manually adjustable and capable of modifying the working
position of the roller and the pressure of the roller exerted on the surface to be
cleaned.
[0005] The principal drawback of this type of sweeper is represented by the fact that despite
the possibility to vary the pressure which is exerted by the roller on the surface
to be cleaned, such adjustment causes the roller to be rigidly positioned with respect
to the surface to be cleaned, thus becoming no longer capable of oscillating about
its own suspension axis.
[0006] From JP-A-06 128918 is known a road sweeper in which a spring energizes the sweeping
brush in the direction separating from a road, and a hydraulic cylinder energizes
the sweeping brush in the ground direction, opposite to the spring's action.
[0007] The cylinder must be activated by a source of energy and if this source breaks down
the sweeping brush remains in a rest inactive position.
[0008] Furthermore the Japanese road sweeper makes necessary to have not only the hydraulic
cylinder but also a pump, a distributor a valve, i.e. a whole hydraulic circuit for
operating the cylinder.
[0009] From JP-A-06 081324 is known another device wherein a pressing cylinder presses the
sweeping brush in the ground direction as in the previous document and is subject
to the same drawbacks.
[0010] EP-A-0705557, which is a 54(3)(4) EPC document designating DE, FR, GB, IT, NL, SE,
relates to a scrubbing machine having offset cylindrical brushes.
[0011] The scrub head is mounted to the chassis by an articulated linkage which includes
a pair of spaced links, each of which is pivotally mounted to the chassis at a pivot
point and is pivotally mounted at the opposite end to the scrub head.
[0012] A pair of coil springs bias the scrub head in a upward direction, with the weight
of the scrub head maintaining it on the floor.
[0013] The articulated linkage together with the springs have the purpose of minimizing
damage to the scrub head when it should contact an obstruction such as a wall, permitting
a rising of the scrub head.
[0014] However, the spring arrangement serves only to substain and support the scrub head
and the springs are fixed lightening springs, which can not be adjusted and so the
weight of the scrub head can not be changed.
[0015] The aim of the present invention is to eliminate the above mentioned drawbacks by
making available a device for the adjustment of the pressure exerted by the brush
roller on the surfaces to be cleaned, allowing the brush roller to maintain the possibility
to carry out oscillations about its own support axis so as to ensure the maximum adhesion
of the roller to the structure of the surfaces to be cleaned.
[0016] A further aim of the present invention is to allow the brush roller to be kept elastically
pressed against the surface to be cleaned with an adjustable force with respect to
the weight-force.
[0017] The said aims are fully attained by the device in the present invention, as characterised
in the appended claims.
[0018] The said elastic means are preferably constituted by a spring which is fixed at one
extremity to one fixed frame of the machine, having the other extremity working on
a lever which is kinematically connected, by means of transmissions, to the roller
so as to vary the pressure exerted onto the surfaces to be swept.
[0019] These and other characteristics will better emerge from the following description
of a preferred embodiment, which is shown as a non-limiting example in the attached
drawings, in which:
- Figure 1) shows a vertical median section of a particular of the sweeping machine;
- Figure 2) shows a lateral view of the particular of the sweeper;
- Figure 3) shows the particular according to a section I-I of figure 2).
[0020] With reference to the figures, 1 denotes a frame, of an industrial sweeping machine,
only partially shown, which supports a substantially horizontal axis 3 whose extremities
are inserted into seats 4.
[0021] The seats 4 are fixed onto a couple of opposed plate shaped flanges 5 which support
a brush roller in the lower area, said brush roller being denoted with 2 as a whole.
[0022] The brush roller 2 includes an internal drum 2a to which are fixed the proper brushes
2b, which is made to rotate by a motorisation 6 which is connected to the said internal
drum 2a in a known way.
[0023] The embodiments described above permit the brush roller 2 to oscillate about its
own suspension axis 3.
[0024] The possibility of oscillation of the roller about its own suspension axis is adjusted
by an original adjusting device, denoted with 7 as a whole and shown in figures 2)
and 3).
[0025] The device 7 includes a first lever 8 fixed onto the axis 3 and operated by an arm
9, of an adjustable length, which in turn is motioned by a second lever 10 splined
on a pivot 20 which is held up by two supports 22 constrained to the frame 1 of the
sweeper.
[0026] Also splined on the pivot 20 is an arm 10a which is fork shaped and supports a stop
plate 23.
[0027] On the arm 10a acts a spring 11 having one extremity constrained to the frame of
the sweeper and the other extremity is fixed to the arm 10a.
[0028] By means of an adjusting nut 12 it is possible to adjust the returning force of the
spring 11 on the arm 10a and as a consequence it is possible to adjust the pressure
exerted by the brush roller 2 on the surface to be swept.
[0029] The spring 11, with the nut 12 and the transmissions 8,9 and 10, constitute elastic
means to control and adjust the oscillations of the roller 2 about the suspension
axis 3.
[0030] In this way, during the cleaning phases, according to the moving direction indicated
by the arrow 19 in figure 2), if it is desired that the roller exerts a force which
is higher than that of its own weight on the surface to be cleaned it is sufficient
to act on the adjusting nut 12 to ensure that the roller 2 is pressed harder against
the surface to be cleaned.
[0031] In the case in which the roller needs to be completely lifted when transporting the
sweeping machine (where it is advisable that the roller itself is not kept in contact
with the floor), provision is made for a lifting device 13 which is capable of pushing
on a lever 21 after a free stroke corresponding to an adjusting stroke of the spring
11.
[0032] The lever 21 is inserted in a neutral position on the pivot 20 and after a free stroke
strikes against the stop plate 23.
[0033] The device 13 is made of a nut screw device operated by an electric actuator 14.
[0034] The lifting device 13 can also be made by means of a pneumatic cylinder or other
suitable equivalents.
[0035] The adjusting device 7 enables the roller 2 to be kept elastically pressed against
the surface to be cleaned, during the sweeping phases, with a force which is different
from its own weight-force.
Claims for the following Contracting State(s): CH, LI, ES
1. A device for the self-levelling and the adjustment of the pressure of the floor roller,
in industrial sweeping machines, of types including a brush roller (2) freely rotating
to oscillate about a first axis (3) different from its own rotating axis, means (11)
for controlling and adjusting the oscillation of the roller (2) about said first axis
(3) in such a way that the brush roller (2) exerts a determined pressure on the surface
to be swept, which is normally different from that due to the weight-force thereof
characterised in that said means (11) is strictly mechanical means acting elastically
on the brush roller (2).
2. A device for the self-levelling and the adjustment as in claim 1, characterised in
that the said means include a spring (11), constrained to an extremity of the fixed
frame (1) of the machine having the other extremity operating on a lever (10) which
is connected, by means of transmission (8,9), to the roller (2) so as to vary the
pressure exerted onto the surface to be swept.
3. A device for the self-levelling and the adjustment as in claim 2, characterised in
that the said device includes an adjusting nut (12) of the returning action exerted
by the spring (11) on the lever (10).
4. A device for the self-levelling and the adjustment as in claim 1, characterised in
that the said device includes a pivot (20) supported by the frame of the sweeping
machine to which is splined the lever (10), on said pivot being splined to one arm
(10a) onto which acts the spring (11).
5. A device for the self-levelling and the adjustment as in claim 1, characterised in
that the said device includes a lifting device (13) for the roller, said lifting device
(13) acting on a lever (21), which is idle on the pivot (20), and moves against an
arm (10a) after an idle stroke.
6. A device for the self-levelling and the adjustment as in claim 2, wherein the means
of transmission (8, 9) comprise an arm (9) of an adjustable length and a further lever
(8).
7. A device for the self-levelling and the adjustment as in claim 5, wherein the lever
(21), free of rotating around the pivot (20), pushes a stop plate (23) of the arm
(10a) when the lifting device (13) is activated.
Claims for the following Contracting State(s): DE, FR, GB, IT, NL
1. A device for the self-levelling and the adjustment of the pressure of the floor roller,
in industrial sweeping machines, of types including a brush roller (2) freely rotating
to oscillate about a first axis (3) different from its own rotating axis, means for
controlling and adjusting the oscillation of the roller (2) about said first axis
(3) in such a way that the brush roller (2) exerts a determined pressure on the surface
to be swept, which is normally different from that due to the weight-force thereof,
characterised in that said means is strictly mechanical and acts elastically on the
brush roller (2) and comprises a spring (11), constrained to an extremity of the fixed
frame (1) of the machine having the other extremity operating on the roller (2) through
connecting means, and the device comprises adjusting means which regulate the action
exerted by the spring (11) on the roller (2).
2. A device as in claim 1, wherein the connecting means comprise a first lever (8), applied
to the first axis (3), an arm (9) of an adjustable length, and a second lever (10).
3. A device for the self-levelling and the adjustment as in claim 2, characterised in
that the said device includes an adjusting nut (12) of the returning action exerted
by the spring (11) on the lever (10).
4. A device for the self-levelling and the adjustment as in claim 1, characterised in
that the said device includes a pivot (20) supported by the frame of the sweeping
machine to which is splined the lever (10), on said pivot being splined to one arm
(10a) onto which acts the spring (11).
5. A device for the self-levelling and the adjustment as in claim 1, characterised in
that the said device includes a lifting device (13) for the roller, said lifting device
(13) acting on a lever (21) which is idle on the pivot (20) and moves against an arm
(10a) after an idle stroke.
6. A device for the self-levelling and the adjustment as in claim 5, wherein the lever
(21), free of rotating around the pivot (20), pushes a stop plate (23) of the arm
(10a) when the lifting device (13) is activated.
Patentansprüche für folgende(n) Vertragsstaat(en): CH, LI, ES
1. Vorrichtung zur Niveauregulierung und Druckanpassung einer Kehrwalze in einer industriellen
Kehrmaschine der Art umfassend eine frei drehbare Kehrwalze (2), die um eine erste
sich von ihrer Drehachse unterscheidenende Achse (3) schwenkt, sowie Mittel (11) zur
Kontrolle und Einstellung der Schwenkung der Walze (2) um diese erste Achse (3) derart,
dass die Kehrwalze (2) auf die zu kehrende Fläche einen bestimmten Druck ausübt, der
sich normalerweise von dem aus ihrer Gewichtskraft resultierenden Druck unterscheidet,
dadurch gekennzeichnet, dass die Mittel (11) rein mechanischer Natur sind und elastisch
auf die Kehrwalze (2) einwirken.
2. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 1), dadurch gekennzeichnet,
dass die Mittel eine an einem Ende an dem festen Rahmen (1) der Maschine verankerte
und mit dem anderen Ende aufeinen Hebel (10) einwirkende Feder (11) umfassen, welcher
Hebel zur Veränderung des auf die zu kehrende Fläche einwirkenden Drucks über Umlemkungen
(8,9) mit der Walze (2) verbunden ist.
3. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 2), dadurch gekennzeichnet,
dass sie eine Mutter (12) zur Einstellung der von der Feder (11) auf den Hebel (10)
ausgewirkte Rückholkraft umfasst.
4. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 1), dadurch gekennzeichnet,
dass sie einen von dem Rahmen der Kehrmaschine getragenen Zapfen (20) umfasst, an
dem der Hebel (10) angebracht ist, wobei an diesem Zapfen ein Arm (10a) angebracht
ist, auf den die Feder (11) einwirkt.
5. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 1), dadurch gekennzeichnet,
dass sie eine auf einen Hebel (21) einwirkende Walzenhebevorrichtung (13) umfasst,
welcher Hebel sich in loser Stellung an dem Zapfen (20) befindet und sieh nach einem
Freihub gegen einen Arm (10a) bewegt.
6. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 2), bei der die
Umlenkungen (8,9) einen längenverstellbaren Arm (9) sowie einen weiteren Hebel (8)
umfassen.
7. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 5), bei der der
frei um den Zapfen drehbare Hebel (21) auf eine Endbegrenzungsplatte (23) des Arms
(10a) drückt wenn die Hebevorrichtung (13) in Betrieb ist.
Patentansprüche für folgende(n) Vertragsstaat(en): DE, FR, GB, IT, NL
1. Vorrichtung zur Niveauregulierung und Druckanpassung einer Kehrwalze in einer industriellen
Kehrmaschine der Art umfassend eine frei drehbare Kehrwalze (2), die um eine erste
sich von ihrer Drehachse unterscheidenende Achse (3) schwenkt,
Mittel zur Kontrolle und Einstellung der Schwenkung der Walze (2) um diese erste Achse
(3) derart, dass die Kehrwalze (2) auf die zu kehrende Fläche einen bestimmten Druck
ausübt, der sich normalerweise von dem aus ihrer Gewichtskraft resultierenden Druck
unterscheidet,
dadurch gekennzeichnet, dass die Mittel rein mechanischer Natur sind und elastisch
auf die Kehrwalze (2) einwirken und eine an einem Ende an dem festen Rahmen (1) der
Maschine verankerte und mit dem anderen Ende über Verbindungsmittel auf die Walze
(2) einwirkende Feder (11) umfassen, und die Vorrichtung Mittel zur Einstellung der
von der Feder (11) auf die Walze (2) ausgeübten Kraft umfasst.
2. Vorrichtung nach Anspruch 1, bei der die Verbindungsmittel einen ersten an der ersten
Achse (3) angebrachten Hebel (8), einen längenverstellbaren Arm (9) und einen zweiten
Hebel (10) umfassen.
3. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 2), dadurch gekennzeichnet,
dass sie eine Mutter (12) zur Einstellung der von der Feder (11) auf den Hebel (10)
ausgewirkten Rückholkraft umfasst.
4. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 1), dadurch gekennzeichnet,
dass sie einen von dem Rahmen der Kehrmaschine getragenen Zapfen (20) umfasst, an
dem der Hebel (10) angebracht ist, wobei an diesem Zapfen ein Arm (10a) angebracht
ist, auf den die Feder (11) einwirkt.
5. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 1), dadurch gekennzeichnet,
dass sie eine auf einen Hebel (21) einwirkende Walzenhebevorrichtung (13) umfasst,
welcher Hebel sich in loser Stellung an dem Zapfen (20) befindet und sich nach einem
Freihub gegen einen Arm (10a) bewegt.
6. Vorrichtung zur Niveauregulierung und Druckanpassung nach Anspruch 5), bei der der
frei um den Zapfen (20) drehbare Hebel (21) auf eine Endbegrenzungsplatte (23) des
Arms (10a) drückt wenn die Hebevorrichtung (13) in Betrieb ist.
Revendications pour l'(les) Etat(s) contractant(s) suivant(s): CH, LI, ES
1. Dispositif de mise à niveau automatique et de réglage de la pression du rouleau sur
le sol, sur des balayeuses industrielles, du type comprenant un rouleau-brosse (2)
libre de pivoter pour osciller autour d'un premier axe (3) différent de son propre
axe de rotation, des moyens (11) pour contrôler et régler l'oscillation du rouleau
(2) autour dudit premier axe (3) de telle manière que le rouleau-brosse (2) exerce
sur la surface à balayer une pression définie, normalement différente de celle dûe
à sa propre force de pesanteur, caractérisé en ce que lesdits moyens (11) sont des
moyens de type strictement mécaniques agissant élastiquement sur le rouleau-brosse
(2).
2. Dispositif de mise à niveau automatique et de réglage selon la revendication 1), caractérisé
par le fait que lesdits moyens comprennent un ressort (11), ancré en une extrémité
au châssis (1) fixe de la machine et dont l'autre extrémité agit sur un levier (10)
relié par l'intermédiaire de renvois (8,9) au rouleau (2) pour varier la pression
exercée sur la superficie à balayer.
3. Dispositif de mise à niveau automatique et de réglage selon la revendication 2), caractérisé
par le fait qu'il comprend un écrou (12) de réglage de l'action de rappel exercée
par le ressort (11) sur le levier (10).
4. Dispositif de mise à niveau automatique et de réglage selon la revendication 1), caractérisé
par le fait qu'il comprend un pivot (20) supporté par le châssis de la machine balayeuse,
sur lequel est claveté le levier (10) ainsi qu'un bras (10a) sur lequel va agir le
ressort (11).
5. Dispositif de mise à niveau automatique et de réglage selon la revendication 1), caractérisé
par le fait qu'il comprend un dispositif de soulèvement (13) du rouleau qui agit sur
un levier (21) libre en rotation sur le pivot (20) et se déplaçant contre un bras
(10a) après un course libre.
6. Dispositif de mise à niveau automatique et de réglage selon la revendication 2), dans
lequel les renvois (8,9) comprennent un bras (9) de longueur réglable et un autre
levier (8).
7. Dispositif de mise à niveau automatique et de réglage selon la revendication 5), dans
lequel le levier (21), libre de pivoter autour du pivot (20), pousse une plaque de
fin de course (23) du bras (10a) lorsque le dispositif de soulèvement (13) est activé.
Revendications pour l'(les) Etat(s) contractant(s) suivant(s): DE, FR, GB, IT, NL
1. Dispositif de mise à niveau automatique et de réglage de la pression du rouleau sur
le sol, sur des balayeuses industrielles, du type comprenant un rouleau-brosse (2)
libre de pivoter pour osciller autour d'un premier axe (3) différent de son propre
axe de rotation,
des moyens (11) pour contrôler et régler l'oscillation du rouleau (2) autour dudit
premier axe (3) de telle manière que le rouleau-brosse (2) exerce sur la surface à
balayer une pression définie, normalement différente de celle dûe à sa propre force
de pesanteur,
caractérisé en ce que lesdits moyens (11) sont des moyens de type strictement mécaniques
agissant élastiquement sur le rouleau-brosse (2) et comprennent un ressort (11), ancré
en une extrémité au châssis (1) fixe de la machine et dont l'autre extrémité agit
sur le rouleau (2) par l'intermédiaire de moyens de liaison, et en ce que le dispositif
comprend des moyens de réglage qui règlent l'action exercée par le ressort (11) sur
le rouleau (2).
2. Dispositif selon la revendication 1, dans lequel les moyens de liaison comprennent
un premier levier (8), appliqué au premier axe (3), un bras (9) de longueur réglable,
et un second levier (10).
3. Dispositif de mise à niveau automatique et de réglage selon la revendication 2, caractérisé
par le fait qu'il comprend un écrou (12) de réglage de l'action de rappel exercée
par le ressort (11) sur le levier (10).
4. Dispositif de mise à niveau automatique et de réglage selon la revendication 1, caractérisé
par le fait qu'il comprend un pivot (20) supporté par le châssis de la machine balayeuse,
sur lequel est claveté le levier (10) ainsi qu'un bras (10a) sur lequel va agir le
ressort (11).
5. Dispositif de mise à niveau automatique et de réglage selon la revendication 1, caractérisé
par le fait qu'il comprend un dispositif de soulèvement (13) du rouleau qui agit sur
un levier (21) libre en rotation sur le pivot (20) et se déplaçant contre un bras
(10a) après un course libre.
6. Dispositif de mise à niveau automatique et de réglage selon la revendication 5, dans
lequel le levier (21), libre de pivoter autour du pivot (20), pousse une plaque de
fin de course (23) du bras (10a) lorsque le dispositif de soulèvement (13) est activé.