Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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ROTARY BRUSH WITH DECRIrASED TRASH THROW 4UTSIDFs SWATB
s This invention is in the field of street cleaning equipment,
and more pa,x'ticularly deals with improvements to a rotary
brusk~ which will result in a decreased amount of debris being -
thrown outside of the swath of the rotary brush.
to
sxcx~y
The main element of a mechanical street sweeping mechanism is
a large rotary pickup brush which is mounted at the rear of
1s the chassis of the street sweeper. This pickup brush is
generally a variation on a basic design ~ a cylindrical brush
core is rotatably mounted on axis parallel to the rear of the '
street sweeping unit such that the core can be rotatably
mounted on an axle or the like and rotated in a circular
2o direction towards the remainder of the street sweeping unit,
ix7, the direction of travel of the street sweeping unit.
Bristle assemblies are attached about the outer surface of the
bx'ush Core such that as the brush Gore is rotated towards the
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remainder of the street sweeping unit, debris can be swept
from the surfaCE passing below the pickup brush into an
elevator for deposit in a reservoir and removal.
s ~'he bristle assemblies themselves generally consist of a
straight mounting bar outwards from which extend a number of
pliable bristles. In order that debris swept forward by the
bristle assembly be swept towards the center of the street
sweeping unit and not off to one side, the bristle assemblies
ao are mounted straight across the brush core such that as each
bristle assembly is rotated into brushing position along the
relative bottom of the brush core. in contact with the surface
I
being cleaned, the mounting bar of the bristle assembly and
the row of bristles extending therefrom are parallel to the
I ~s caliection area of the elevator. To view such a conventional
pickup brush from the side, the bristles extend outwards
approximately x'adially from tk~.e center of the brush core _ The
radial orientation o~ the bristles and bristle assemblies in
relation to the brush core provides for the most effecti-cre and
ZD most aggressive brushing movement by the bristles as they pass
over the surface being cleaned.
The pliable bristles towards each end of each bristle asse~ly
will in many cases throw dust or debris up and outside of the
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swath of the pickup brush as they sweep across the surface arid
snap back into their resting position as the brush continues
to rotate. Small deposits or taws of debris end up being
deposited or left on the surface being cleaned along the edges
of the pickup brush swath.
The first attempts t4 avoid this problem involved the addition
of xetaining walls extending back from the elevator to a
position past the side of tha pickup brush. In the industry
to these are commonly referred to as drag shoes. The drag shoes
are allowed to drag along the street surface and stop any
debris from flying' outside of the swath of the pickup brush.
pne of the major problems with street sweepers ,xsing drag
shoes, as is evident from the name of that component, is that
is the constant drag of these debris guides on the road surface
results in thei.x need to be ohaxxged quite regularly due to
wear and tear. Ins addition to the downtime of the street
sweeping unit CZuring the change of such components, there is
considerable additional cost both in terms a~ labor and parts,
zo to maintain these parts in working condition. Tt is
particularly problematic because as the drag shoes wear, thei.x
effectiveness is decreased. Drag shoes are als4 not
completely affective in a situaGzolt'1. whexe the surface being
cleaned is 'v'ery dirty.
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It would be advantageous to be able to reduce the amount of
debris thrown outside of the swath of the pickup brush on a
street sweeper without having to change the shape of the
m4untir~g bar of the bristle assemblies from being straight,
s~.xlce the straight bristle assemblies are far easiex' to mount,
build axed maintain. In addition, be~,xxg able to maintain the
orientariori of the bx'istles of the bristle assemblies when
mounted as extend,~.ng outwards approximately radially from the
to center of the brush core pro~rides for the most aggressive
oleaning motion by the pickup brush.
S'U1~~ARY OF I I
It is the object of the present invention to pr'ovxde a rotary
brush for use in such applioations as the pickup brush on a
mechanical street sweeper which brush would decrease the
2mouT7,t of debris or dust thrown outside of the path or swath
of the brusk~_ zt is the further object of the present
invention to provide such a rotary brush wherein the portion
of tho mounting bar of each bristJ.e assembly which is used to
attach the bristle assembly to the brush core remaix~,s straight
and the majority of the bristles extend radialJ.y Qutward from
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the centre of the brush. care.
The invention discloses a rotary brush comprising a
cylindrical brush core with a plurality of bristle assemblies
s displaced thereon, each bristle assembly having a plurality of
bristles extending outward therefrom, a plurality of bristles
near each end of each bristle assembly being mounted such that
their material throw will be towards the oentxe of said
bristle assembly and cylindrical bx'ush_ The remainder of the
to bristles of each bristle assembly could extend approximately
radially outwards from the brush core and the material throw
of these bristles might be directly ahead of the brush where
said brush is rotated about its axis.
15 The bristles xzear the end of each bristle assembly of this
rotaxy brush would be deflsoted to~rards the centre of the
brush.
More particularly, there is disclosed a rotary brush
20 compz'ising a cyllridx'xcal brush core, and a plurality of
bristle assemblies attached about the outer surface of said
brush coxe, each said bristle assembly having two ends and
each sand bristle assembly comprising a mountixzg bar, said
mounting bar having a brush attachment edge and a bristle
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mounting edge; and bristles attached along and extending
outward from the bristle mounting edge of said mounting bar,
wherein the bristles at or near the ends of said mounting bar
are deflected towards the centre of the mounting bar while the
remainder of the bristles extend approximately radially
outward from the cexitre of said brush core.
It is particularly contemplated that the bristles near each
end of each bristle assembly could be deflected towards the
io centre of the bristle assembly by az~,c~ling each of the ends of
the bristle mounting edge inwards towards the centre of the
mounting bar at an angle of deflection. As such, the bristles
attached along the bristle mounting edge in this angled
section would be al~:~led inwards, arid the remainder of the
i5 bristles could remain substantially straight, extending
radially outwards from the centre of the cylindrical brush
core.
This bristle assembly might have a mounting bar witk~ a bri$tle
zo mounting edge that comprised a central section and a deflected
mounting section at each end thereof, wherein each said
deflected mounting section was bent towards the central
section at an angJ.e of deflection-
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Since the majority of the bristles of the bristle assembly of
the present invention will be mounted such that they extend
outwards approximately radially from the centre of the brush
care, the sweeping motion of the bristle assembler and rotary
brush of tae present invention will be most aggressive. As
well, since the angled portions of each end of the bristle
assembly do not exteYld all the way to the centre of the
bristle assembly, i.e. a V shape is z~ot formed, debris swept
forward by the brush w111 not be thrown all the way to the
to centre of tk~e swath and the elevator can then be counted on to
work at its maximum efficiency. The angle of deflection at
each end of the bristle assembly could be adjusted in
manufacture far various situations and it will be understood
that various angles are contemplated within the scope of the
1s present ~nvention_
The brush attachment edge of the mounta.z~g bar of the bristle
assemblies would optimally be straight. Similarly, the
central section of the bristle mounting edge would also
20 opt7.mally be stxaight, although it will be understood that
other prof~.les cculd be given to the central section of the
bristle mounting edge without departing from the sCOpe and
intent of the claimed invention.
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Since the brush attach-ment edge of each bristle assembhy would
remain straight, the assembly of the rotary brush of the
present invention by attaching the bristle assemblies to tk~e
brush core would be quick and easy since they axe all attached
s in straight lines. 'fhe laboux requirements would be less and
the mounting hardware might also be decreased. Repair of the
brush by replacement and removal of individual bristle
assemblies would also be easier.
~o Given the straight nature of Ghe bxush attachment edge of the
bristle assembly of the present invention, it will be
understood that the bristle assembly of thg present irxvention
eQUld also be used as a retrofit item on older cylindrical
brush cares. This would allow fo'r' the mQC~ification of
1~ preexisting street sweepixzg equipment or other rotary brush
equipment for ir~ereased performance and reduced throw butside
of the swath of the brush.
The present invention, ix~ addition to being a complete xotary
zp brush assembly', also includes the bristle assetr~bly designed
for use therewith.
DESCRIP~IIQN OF THE DRAWINGS:
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While the invention is claimed in the concluding portions
hereof, preferred embodiments are provided in the accotttpanying
detailed description which may be best understood in
conjuriC~.iQn with the accompanying diagrams where like parts in
each of the several diagrams are labeled with like x~umlaers,
and where:
Figure 1 is a side view of one embodiment of a brist7.e
lp assembly of the present invention;
Figur$ 2 is a perspective view of the mounting bar of the
embodiment of Figure 1;
F~,gure 3 is a top view of the embodiment of Figure 1;
Figure 4 shows one embod~.ment of a rotary brush,
demonstrating the mQUntinc~ of bristle assemblies such as
those of Figuxes 1 to 3 on a cylindrical brush pore;
2p
Figure 5 shows an end cross section of one embodiment of
a rotary bxush empla~ring the bristle assemblies of
Figures ~. to 3 , which demonstrates the angled ends Qf the
bristle assemblies; and
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Figure 6 is a crass section of the centre of the brush of
Figure 5, demonstrating the radial dxspo$ition of the
majority of the bristles.
DETAINED DESC3i N OF k~D ~DDI~E~TTS
Ar, outlined above, the present inveritiori is a modified
cylindrical brush for use Qn a street sweeper of the like,
which will reduce or' eliminate the throw of material outside
the swath of the brush and avoid same of the pxablems
associated with arcuate bristle assemblies currently known ire
the art . Figures 1 to ~ demonstrate orxe embodiment of the
bristle assembly of the pxesent invention. There is shown the
is bristle assembly (~), whioh consists of a mounting bar (5)
with bristles (4) mounted thereon. The mounting bar (s) has
a brush attachment edge (6) and a bxistle mounting edge (7).
As can be seen from these figures, the mountixzg bar (5) is
essentially straight, particularly along its brush attachment
zo edge (6). 8y making the brush attaehmEnt edge (5) stxaight,
the bristle assembly (3) of the present invention can most
easily and quickly be mounted onto a brush core and removed
individually for change or repair. The mounting bar t5) and
bristle assembly (3) each have two ends (10). As can be seen
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from Figures 3 to 5, bristles (4) are attached along axed
extend outward from the bristle mounting edge (~) of the
mounting bar (5) . The key of tk~e pxesent invention is that
the bristles (4) at or near the ends (10) of the mounting bar
(5) are de~J~eeted towards the centre of the mounting bar (5).
Iri this fashion, the material throw from the bx'istles (4)
closest to the ends (10) of the maun,ting bar will be towards
the centre of the mounting bar (5) and the bristle assembly
t3) and the brush to whxck~ it ie attached. The remainder of
1o the bristles (~), towards the centre of the mounting bar (5),
would remain oriented such that their material throw would be
straight ahead c~f the bristle assembly (3) as the bristle
assembly (3) and its attached bristles (~) were moved across
the ground. Thus, the material throw of the entire bristle
is assembly (3) into the elevator or other collection de'u'iCe
would remain relatively e~ren, rather than concentrating the
material throw all at the centre of the mounting bar (5) as
would be the case in a conventional arcuate bristle assembly .
situation.
The portions of the bristle mounting edge ('7) closest to eaoh
end (10) of the mounting bar, which portions Iwo~txld be angled
j.zlwards towards the centre of the moixnting bar (51 at an angle
of deflection, would be the deflected maunting sections (~) of
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the bristle mounting edge (7). The deflected mounting
secti4ns (8) would not reach all the way to the centre of the
mQUnting bar (5), rather there would be a straight centre
section (9) of the mounting bar (5) between the de~~,e>Yted
mountinrj sections (8) . The defJ.ected mpunting sections (8) at
each end (10) of the mounting bar would accomplish the goal of
deflecting the bristles (4) closest to each end (10) t6wa~'ds -
the centre of the mounting bar (5), while leaving the
remainder of the bristles (~) in a standard straight line
~o across the bristle mounting edge (?).
It will be understood that the angle of dsfl~Ctiori of the
deflected mounting sections (8), in relation to the remainder
of the bristle rnou~xting edge (?) and particularly tk~e centre
section (9) thereof, Could be varied in manufacture for
various circumstaxlces and as such any angle which accomplishes
the goal. of deflecting bristles (4) mounted thereon towards
the centre of the mounting bar (5), resulting in the direction
of material throw by said bristles towards the centre of the
zo mounting bar (5), xather than straight ahead, xs >Yoz~templated
within the scope of the px'esexat invention.
Bristles of various materials could be used_ Fox example,
metal wire, plastic or other matexi.als could be used, so long
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as they provided the necessary rigidity and pliable
charaCGeTistics to properly accomplish their job. Insofar as
the material of manufacture of the bristles (4) is not
directly relevant to the efficiency or operation of the
s apparatus of the present invention, it will be understood that
all materials of manufacture are car~templated within the scope
of the present inve~ztian- -
The deflected mounting seotions (e) of the bristle mounting
~u edge (7) do not reach all the way to the centre of the
mounting bar (5). There is a ae~clltre seotion (9} between the
deflected mouritix~,g sections (8), clang which also there are
bristles (4) mounted. In one embodiment, as shown, the oentre
section ( 9 ) of the bristle mc~~xr~ting edge ('7 ) might be shaped
15 relatively straight, such that bristles (4) mounted thereon.
extend straight outwards from the mauz~tlng bar (5), and when
the mounting box (5) is mounted properly on a rotary brush ox
brush Core the bristles (4) will extend outwards approximately
xadially from the centre of the cylindrical brush core. zt
yo will be understood, hot~rever, that a further alteration which
could be made to modify the performance of the present
invention ~rould be to angle the bristle mounting edge (7) ins
relation to the brush aGtaehmex~t edge (5), which would
optionally alter the aggx'essivene$s of the behaviour of the
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bristles (4). It will be understood that this modification is
also contemplated within the scope of the present inve~ntiari.
Figure 3 demonstrates the mounting box (5) of the present
s invention from a tap view, while Figure 2 is a perspective
view of the mounting bar of the embodiment Qf Figures 1 and 3,
partiGUlarly demonstrating the deflected mounting sections (8) -
along the br~.stle mounting edge ('7) .
>Ip It will be understood that the angle of deflection might be a
sharp angle ar alternatively might be a gentle bend or arcuate
shape. rt will be understood that any such angle or bend
placed along the bristle mounting edge (7) which accomplishes
the goal of directing the throw of bristles (4) mounted
~s thereon towards the centre of the mounting box (5) is
contemplated within the scope Qf the present invention_
figure ~l demonstrates an embodiment of the rotary brush of the
present invention, whereby the bristle assemblies described in
2v relation to Figures 1 to 3 are mounted on a cylindrical brush
core_ Figure 4 demonstrates the utility of the straight brush
attachment edge (6) versus the arcuate mounting arms of the
prior art.
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Figures 5 and 6 are cY'oss-sectional views of the embodiment of
Figure 4. As an ez~d cross-section, this figure demonstrates
the appearance of the bristles (4) attached in the deflected
mounting sections (8) of each bristle assembly (3). Also
shown is a brush core (2) terhich can be mounted along its axis
and rotated in a swath to sweep debris ar other mater~.al fxom
the surface being cleaned forward into an elevator or other
receptacle.
to Figure 6 is a centre cross-section of the embodiment of Figure
4 which demonstrates the positioning of the bristles (~) ~.~n
the central section (9) of the mounting bar(5). In that case
it can be seen that the bristles (4) in the central section
(9} of the mounting bax~ (5), when the bristle assembly (3} is
~s mounted in position an the brush core (a) , extend outwards
approximately radially from the centre of the brush coxe (~).
This will provide for the most aggressive cleaning behaviour
of Che majority of the bristles (4) of each bristle assembly
zo
in addition to the rotar~r brush Shawn in the figures of the
present invention, the bristle assembly itself as described in
relation to these Figures and embodiments is also intended to
be within the scope of the present invention as claimed,
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Thus it can be seen that the invention accomplishes all of irs
stated objectives. The faregoi.ng is considered as
illustrative only' of the principles of the ixxvontion_
Further, since numerous changes and modificatlQns will readily
occur to those skilled ix~ the art, it is not desired to limit
the invention to the exact construction and operation shown
and deSCY'lb~d, and accordingly, all such suit~Ie Changes or
modifications in structure or operation which may be resorted
to are intendcbd to fall within the sCOpe of tk~e claimed
iD invention.
