IMPROVEMENTS IN A ROOF TILE MAKING MACHINE

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European Patent Office
Office europeen des brevets
(11)
EP
0 697
943
B1
E U R O P E A N PATENT S P E C I F I C A T I O N
(12)
ation and mention
mention
(45) Date of publication
of the grant of the patent:
27.12.1996 Bulletin 1996/52
(51) Int. CI.6: B28B 5/04,
B28B 1 3 / 0 2
(86) International application number:
PCT/EP94/01443
(21) Application number: 94916202.8
(87) International publication number:
WO 94/25235 (1 0.1 1.1 994 Gazette 1994/25)
(22) Date of filing: 28.04.1994
(54) IMPROVEMENTS IN A ROOF TILE MAKING MACHINE
VERBESSERUNGEN FUR EINE VORRICHTUNG ZUM HERSTELLEN VON DACHZIEGELN
AMELIORATIONS APPORTEES A UNE MACHINE A FABRIQUER DES TUILES
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB IE IT LI LU NL PT SE
(30) Priority: 29.04.1993 GB 9308887
(43) Date of publication of application:
28.02.1996 Bulletin 1996/09
(73) Proprietor: REDLAND TECHNOLOGIES LIMITED
Reigate, Surrey RH2 0SJ (GB)
(74) Representative: Grant, John Stephen Shirley
Redland PLC
Redland House
Reigate Surrey RH2 OSJ (GB)
(56) References cited:
EP-A-0 035 010
DE-C- 219 443
FR-E- 56 878
US-A- 4 068 990
DE-A-3 418134
FR-A-2199 284
US-A- 3 477 108
US-A- 4 708 628
(72) Inventor: OBEROI, Bhushan, Kumar
Reigate, Surrey RH2 9LG (GB)
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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).
Printed by Rank Xerox (UK)Business Services
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EP 0 697 943 B1
Description
This invention is concerned with improvements in or
relating to a roof tile making machine and its method of
operation.
Concrete roof tiles are in the main formed by the
well known roller and slipper method in which tile pallets
are fed seriatim beneath the mortar hopper of a tile
making machine, whereat when the machine is in use,
mortar is fed by a packshaft.roller and slipper onto the
pallets to form a continuous ribbon thereon. Downstream of the mortar hopper, a cutting mechanism of the
tile making machine is operated to cut the ribbon of mortar to form discrete "green state" tiles on the individual
pallets which "green state" tiles are thereafter cured by
conventional means.
The upper surfaces of the tiles so formed are generated by the roller and slipper and may therefore be of
any desired profile across the tiles so formed. For example, the tiles may have a so-called "Bold Roll" or
"Roman" profile.
The under-surfaces of the tiles, on the other hand,
formed
are
by the pallets, that is, the surfaces of the pallets are shaped with recesses and channels to form
hanging nibs, strengthening ribs and downwardly facing
interlocking sidelock features of the tiles.
Often the strengthening ribs have a depth which is
self-defeating in relation to their purposive intent which
is to strengthen the tiles. Tests effected on cured tile
sections have consistently indicated that the thin body
sections have greater strength than the ribs or that size
for size the proportion of the tile's strength supplied by
the ribs is disproportionate to their depth.
It is believed that this phenomenon is caused by the
variations in compaction of the different sections of the
tiles. For example, a thin body section is readily compacted to give a high strength for a particular cross-section and yet an adjacent strengthening rib formed under
the same compacting pressures, applied by the same
roller and slipper does not have the strength expected of
it. Visual examination of the cross-section of such ribs
by examination of the apparent porosity thereof has
revealed that the compaction of the mortar is greatest
towards the thin body portion of the tiles whilst it falls off
towards the extremities of the ribs, that is the degree of
compaction of the mortar in the ribs is apparently a
function of the respective depths of the ribs.
A tile making machine is disclosed in GB 2183530B
which machine is specifically intended for use in making
verge tiles having a "Bold Roll" profile across the width
of the tile. From the disclosure and drawings of GB
21 83530 B, it is apparent that no provision is made for
ensuring that all sections of the tiles made on such a
machine are evenly compacted.
The present invention seeks to overcome or at least
mitigate the disadvantages of the prior art concrete roof
tiles. Thus, the present invention provides a tile making
machine comprising a hopper provided with a packshaft, roller and slipper, said packshaft being effective,
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so
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2
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when the machine is in use and tile pallets are fed seriatim beneath said hopper, to direct mortar onto said pallets as they pass beneath the roller and slipper to form
a continuous ribbon of mortar on said pallets, characterised in that the tile making machine also comprises
compaction means upstream of said packshaft, roller
and slipper, which compaction means comprises a primary compaction device which, when the machine is in
use and tile pallets are fed as aforesaid, directs and
compacts mortar onto and/or into selected portions only
of said pallets said selected portions forming, inter alia,
longitudinal strengthening ribs in finished tiles.
The present invention also provides a tile making
machine according to the preceding paragraph further
characterised in that said compacting means also comprises a secondary compaction device wherein, when
the machine is in use, and after the primary compaction
device has directed and compacted mortar onto and/or
into the selected portions of the pallets as aforesaid, the
secondary compaction device further compacts the
mortar in said selected portions only of the pallets as
the pallets pass therebeneath to fully compact the mortar of the portions forming the longitudinal strengthening
ribs in the finished tile as aforesaid.
Preferably in the tile making machine according to
the last two preceding paragraphs, the primary compaction device comprises a multi-tined wheel arranged in
use to overlie selected portions only of said pallets as
aforesaid, the multi-tined wheel conveniently having an
effective width corresponding to the width of the longitudinal strengthening ribs formed by said selected portions only of the pallets.
The present invention also provides a tile making
machine according to the last two preceding paragraphs wherein the secondary compaction device comprises a thin gauge blade element extending parallel to
the direction of feed of the pallets fed seriatim beneath
said hopper, the blade element comprising a blade portion arranged to lie in or towards a nip portion provided
in use of the tile making machine and formed between a
circumferential path generated by the tines of the multitined wheel and co-planar upper surface portions of
said pallets fed therebeneath.
Preferably in the tile making machine according to
the last preceding paragraph said blade element has an
effective length of 0.1 to 0.3 the length of tile pallets
used therewith.
Conveniently in a tile making machine according to
of the last four preceding paragraphs the comone
any
paction means is located in said hopper upstream of the
packshaft, roller and slipper, as aforesaid.
Preferably in a tile making machine provided by the
invention the compaction means may be located in a
secondary hopper located upstream of said hopper.
The present invention also conveniently provides a
process for the manufacture of concrete roof tiles in a
conventional tile making machine provided with a hopper supporting a packshaft, a roller and a slipper all of
known configuration, said process comprising the steps
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of :
a) supplying mortar to a compacting means located
upstream of said packshaft, roller and slipper;
b) causing tile pallets to be fed seriatim beneath
said compacting means whereat, when the process
is being effected, mortar is directed and compacted
onto and/or into selected portions only of said pallets, said selected portions forming longitudinal
strengthening ribs in the finished tile;
c) feeding said pallets with said selected portions
covered and/or filled with mortar seriatim beneath
said packshaft, roller and slipper whereby, as said
process is effected, further mortar is directed onto
said pallets and the mortar already compacted on
and/or in said selected portions of said pallets to
form a cohesive continuous ribbon of mortar on
said pallets;
d) cutting said ribbon of mortar to form discrete
"green state" tiles on individual pallets; and,
e) causing said "green state" tiles to be cured.
There now follows by way of example of the present
invention a detailed description of a tile making machine
which description is to be read with reference to the
accompanying drawings in which :
Figure 1 is a schematic side elevation of a twin hopper tile making machine provided by the invention;
Figure 2 is a schematic side elevation of a hybrid
modification to the hopper arrangement shown in
Figure 1;
Figure 3 is a schematic side elevation of a unitary
hopper tile making machine;
Figure 4 is an enlarged view of parts shown in Figure 1;
Figure 5 is a view in the direction of arrow V in Figure 4; and,
Figures 6 and 7 are corresponding views to Figures
4 and 5 and illustrate further modifications to the tile
making machine.
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In the manufacture of concrete roof tiles by conventional tile processing methods, it has proven difficult if
not impossible to ensure the uniform compaction of the so
layers of mortar throughout the cross-section of the
tiles. This is particularly so in the production of tiles with
deep reinforcing ribs formed in longitudinal recesses of
pallets fed beneath the hopper of a tile making machine.
The present invention thus comprises a unique tile ss
making machine 4 which enables a novel method of
making concrete roof tiles 2 to be effected so that all
sections of the tiles produced therein are subjected to
uniform or substantially uniform compaction forces
3
4
resulting in a uniformity of mortar density in the finished
product which, when cured, has a uniform strength or
substantially so.
The tile making machine 4, see Figure 1, comprises
twin hoppers 8 and 10 located in series overlying a pallet conveyor 12. The conveyor 12 is of conventional
design, is supported on floor mounted columns 12a and
12b and comprises support rails 12c on which pallets P
are supported as they pass seriatim beneath the hoppers 8 and 10.
The hopper 8 is also of conventional design and
provides support for a roller 13, a slipper 14 and a pack
shaft 16. The hopper 10 is located upstream of the hopper 8 and comprises a shaft 18 located towards a front
wall 20 thereof. The shaft 18 provides support for a primary compaction device comprised of two tined wheels
18a only one of which is shown in the drawings, the purpose of which tined wheels will be made clear hereinafter. The front wall 20 provides support for a secondary
compaction device comprised of a blade element 22 the
purpose of which element 22 will also be made clear
hereinafter.
Located above each hopper 8 and 10 are respective material feed conveyors 34 and 36 for feeding mortar to said hoppers, see Figure 1.
Downstream of the hopper 8, the tile making
machine is provided with a conventional tile cutting knife
38 which is mounted for reciprocal vertical and longitudinal movement on a knife carriage 40 illustrated schematically in Figure 1.
The tile making machine also comprises a pallet
spacing conveyor 42 which is arranged beneath the
conveyor 12 and adjacent the knife carriage 40 for a
purpose also to be made clear hereinafter.
When the machine of Figure 1 is in use in the manufacture of concrete roofing tiles, two batches of mortar
are fed by the conveyors 34 and 36 to the hoppers 8 and
10 respectively. At the same time, pallets P are fed
seriatim along the support rails 12c of the conveyor 12
so that mortar in hopper 10 is compacted by the tined
wheels 18a into upwardly facing longitudinal recesses
19 of the pallets P, see Figure 5 in which only one such
recess 19 is shown.
The recesses 19 enable the formation of the
strengthening ribs of a roof tile and, as can be seen in
Figure 5, the tined wheels 18a each overlie a respective
one of the recesses 19, the wheels 18a each providing
support for an array of tines 18b in three equi-spaced
seried ranks around the circumference of the wheel
18a.
When the machine is in use and as the pallets P
move underneath the hopper 10 as aforesaid, mortar in
the hopper 10 is constrained to flow into the recesses
19 and is partially compacted therein by the tines 18b of
the wheels 18a. Subsequently, as the pallets P are carried downstream of the wheels 18a, they pass beneath
the blade element 22 which extends downstream from a
nip portion 22a formed between a circumferential path
18c generated by the rotating tines 18b of the wheels
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18a and an upper surface P1 of the pallets P, see Figure
4.
The blade element 22 which is between 0.1 and 0.3
the length of a tile pallet P acts in part as a conventional
slipper and further compacts the mortar into the
recesses 19 to facilitate the manufacture of concrete
roof tiles with reinforcing ribs which are fit for purpose.
It has been found that the best results are obtained
if the hopper 10 is only partially filled with mortar as
shown in Figure 1.
The pallets P thereafter proceed beneath the hopper 8 whereat the mortar therein is compacted by the
packshaft 16, the rollers 13 and the slipper 14 onto the
pallets P and the pre-formed reinforcing ribs to form a
ribbon 46 of mortar on the pallets P in known manner.
The ribbon 46 is thereafter cut by the knife 38 of the
tile cutting arrangement whereupon trailing ends of the
pallets P are engaged by drive elements 52 of the conveyor 42 whereby the "green state" tiles 2 on their associated pallets P are conveyed to racking devices prior to
transportation to curing chambers.
Whereas the novel method of making a concrete
roof tile remains unaltered, the tile making machine may
be modified as shown in Figure 2 in which the twin hopper arrangement is replaced by a hybrid hopper 9 having first and second sections 9a and 9b corresponding
to hoppers 10 and 8 respectively of Figure 1. The sections 9a and 9b are separated by a divider plate 9c
which supports the blade element 22 at its lower end 9d,
see Figure 2. All other features are essentially the same
as those of Figure 1 and they have, therefore, been
accorded like reference characters.
The tile making machine may also be modified as
shown in Figure 3 in which a unitary hopper 11 comprises support for the roller 13, slipper 14, packshaft 16,
tined wheel 18a and the blade element 22. As with the
first modification, all other features are essentially the
same and have, therefore, been accorded like references.
In a further modified arrangement provided by the
invention, see Figure 7, guide plates 20a and 20b may
be provided on each side of the wheels 18a and 18b to
direct mortar into the recesses 19 of the pallets P.
In order to obviate any problems with cavitation of
mortar in the hopper 10 of Figure 1 and to ensure recirculation of mortar, a screw augur 60 may be provided
adjacent the wall 20 as shown in Figure 6 which augur
60 feeds mortar to a collection box (not shown) for recirculation to the top of the hopper 10.
Although not forming part of the present invention,
it will be obvious that tiles made using the three modified arrangements of Figures 1, 2 and 3 may on the one
hand be comprised of different mortars or on the other
hand be of the same mortar throughout their thicknesses. In the arrangements of Figures 1 and 2, the
mortar delivered by conveyor 36 to the hopper 10 or the
section 9a of the hopper 9 may, if required, be made of
different constituents or have varying amounts of the
same constituents in areas to assist the compaction of
6
the reinforcing ribs of tiles made therein. The Figure 3
modification, however, lends itself for use with a single
mortar fed by the conveyor 34.
s
Claims
1.
A tile making machine comprising a hopper provided with a packshaft, roller and slipper, said packshaft being effective, when the machine is in use
and tile pallets are fed seriatim beneath said hopper, to direct mortar onto said pallets as they pass
beneath the roller and slipper to form a continuous
ribbon of mortar on said pallets, characterised in
that the tile making machine also comprises compaction means upstream of said packshaft, roller
and slipper, which compaction means comprises a
primary compaction device which, when the
machine is in use and tile pallets are fed as aforesaid, directs and compacts mortar onto and/or into
selected portions only of said pallets said selected
portions forming, inter alia, longitudinal strengthening ribs in finished tiles.
2.
A tile making machine according to Claim 1 further
characterised in that said compacting means also
comprises a secondary compaction device
wherein, when the machine is in use, and after the
primary compaction device has directed and compacted mortar onto and/or into the selected portions of the pallets as aforesaid, the secondary
compaction device further compacts the mortar in
said selected portions only of the pallets as the pallets pass therebeneath to fully compact the mortar
of the portions forming the longitudinal strengthening ribs in the finished tile as aforesaid.
3.
A tile making machine according to either one of
Claims 1 and 2 wherein the primary compaction
device comprises a multi-tined wheel arranged in
use to overlie selected portions only of said pallets
as aforesaid.
4.
A tile making machine according to Claim 3 wherein
the multi-tined wheel has an effective width corresponding to the width of the longitudinal strengthening ribs formed by said selected portions only of the
pallets.
5.
A tile making machine according to either one of
Claims 3 and 4 wherein the secondary compaction
device comprises a thin gauge blade element
extending parallel or substantially so to the direction of feed of the pallets fed seriatim beneath said
hopper, the blade element comprising a blade portion arranged to lie in or towards a nip portion provided in use of the tile making machine and formed
between a circumferential path generated by the
tines of the multi-tined wheel and co-planar upper
surface portions of said pallets fed therebeneath.
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EP 0 697 943 B1
6.
A tile making machine according to Claim 5 wherein
said blade element has an effective length of 0.1 to
0.3 the length of tile pallets used therewith.
7.
A tile making machine according to any one of the
preceding Claims wherein the compaction means is
located in said hopper upstream of the packshaft,
roller and slipper, as aforesaid.
s
8.
A tile making machine according to any one of
Claims 1 to 6 wherein the compaction means may
be located in a secondary hopper located upstream
of said hopper.
to
9.
A process for the manufacture of concrete roof tiles
using the tile making machine of the preceding
claims, said tile making machine being provided
with a hopper supporting a packshaft, a roller and a
slipper all of known configuration, said process
comprising the steps of:
is
Streichvorrichtung vorgeschaltet ist, wobei das Verdichtungsmittel eine Hauptverdichtungsvorrichtung
umfaBt, die im Gebrauch der Maschine, und wenn
Dachsteinpaletten wie oben erwahnt zugefiihrt
werden, Mortel nur auf und/oder in ausgewahlte
Teile der Paletten leitet und verdichtet, wobei die
ausgewahlten Teile unter anderem Verstarkungslangsrippen in fertigen Dachsteinen bilden.
2.
20
a) supplying mortar to a compacting means
located upstream of said packshaft, roller and
slipper;
b) causing tile pallets to be fed seriatim 25 3.
beneath said compacting means whereat,
when the process is being effected, mortar is
directed and compacted onto and/or into
selected portions only of said pallets, said
selected portions forming longitudinal strength- 30
ening ribs in the finished tile;
4.
c) feeding said pallets with said selected portions covered and/or filled with mortar seriatim
beneath said packshaft, roller and slipper
whereby, as said process is effected, further 35
mortar is directed onto said pallets and the
mortar already compacted on and/or in said
selected portions of said pallets to form a cohe5.
sive continuous ribbon of mortar on said pal40
lets;
d) cutting said ribbon of mortar to form discrete
"green state" tiles on individual pellets; and,
e) causing said "green state" tiles to be cured.
Patentanspruche
1.
45
Maschine zur Herstellung von Dachsteinen, mit
einem Trichter, der mit einer PreBwelle, einer Walze
und einer Streichvorrichtung versehen ist, wobei
die PreBwelle im Gebrauch der Maschine, und so
wenn Dachsteinpaletten der Reihe nach unterhalb
des Trichters zugefiihrt werden, dahingehend wirkt,
6.
Mortel auf die Paletten zu leiten, wahrend sie unterhalb der Walze und der Streichvorrichtung vorbeigefuhrt werden, so daB auf den Paletten ein 55
durchgehendes Mortelband gebildet wird, dadurch
gekennzeichnet, daB die Maschine zur Herstellung
7.
von Dachsteinen des weiteren ein Verdichtungsmittel aufweist, das der PreBwelle, der Walze und der
5
8
Maschine zur Herstellung von Dachsteinen nach
Anspruch 1, weiterhin dadurch gekennzeichnet,
daB das Verdichtungsmittel des weiteren eine
zweite Verdichtungsvorrichtung umfaBt, wobei
diese den Mortel im Gebrauch der Maschine, und
nachdem die Hauptverdichtungsvorrichtung Mortel
auf/oder in die ausgewahlten Teile der Paletten
geleitet und verdichtet hat, wie oben erwahnt, nur in
den ausgewahlten Teilen der Paletten weiter verdichtet, wahrend die Paletten darunter vorbeigeftihrt werden, damit der Mortel der die
Verstarkungslangsrippen in dem fertigen Dachstein
bildenden Teile, wie oben erwahnt, vollstandig verdichtet wird.
Maschine zur Herstellung von Dachsteinen nach
Anspruch 1 oder 2, bei der die Hauptverdichtungsvorrichtung ein mehrere Zinken aufweisendes Rad
aufweist, das im Gebrauch so angeordnet ist, daB
es nur uber ausgewahlten Teilen der Paletten, wie
oben erwahnt, liegt.
Maschine zur Herstellung von Dachsteinen nach
Anspruch 3, bei der das mehrere Zinken aufweisende Rad eine Nennbreite aufweist, die der Breite
der nur von den ausgewahlten Teilen der Paletten
gebildeten Langsverstarkungsrippen entspricht.
Maschine zur Herstellung von Dachsteinen nach
Anspruch 3 oder 4, bei der die zweite Verdichtungsvorrichtung ein Blattelement geringer Dicke aufweist, das sich parallel oder im wesentlichen
parallel zur Zufuhrrichtung der der Reihe nach
unterhalb des Trichters zugefiihrten Paletten
erstreckt, wobei das Blattelement einen Blatteil aufweist, der so angeordnet ist, daB er in einem Spaltteil oder dahin verlaufend liegt, der im Gebrauch
der Maschine zur Herstellung von Dachsteinen vorgesehen ist und zwischen der von den Zinken des
mehrere Zinken aufweisenden Rads erzeugten
Umfangsbahn und koplanaren oberen Flachenteilen der darunter zugefiihrten Paletten gebildet wird.
Maschine zur Herstellung von Dachsteinen nach
Anspruch 5, bei der das Blattelement eine Nennlange von 0,1 bis 0,3 der Lange von damit verwendeten Dachsteinpaletten aufweist.
Maschine zur Herstellung von Dachsteinen nach
einem der vorhergehenden Anspriiche, bei der sich
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EP 0 697 943 B1
das Verdichtungsmittel in dem der PreBwelle, der
Walze und der Streichvorrichtung vorgeschalteten
Trichter, wie oben erwahnt, befindet.
8.
Maschine zur Herstellung von Dachsteinen nach
einem der Ansprtiche 1 bis 6, bei der sich das Verdichtungsmittel in einem dem Trichter vorgeschalteten zweiten Trichter befinden kann.
5
9.
Verfahren zur Herstellung von Betondachsteinen
unter Verwendung der Maschine zur Herstellung
von Dachsteinen nach den vorhergehenden
Anspruchen, wobei die Maschine zur Herstellung
von Dachsteinen mit einem Trichter versehen ist,
der eine PreBwelle, eine Walze und eine Streichvorrichtung, die alle eine bekannte Konfiguration
aufweisen, stiitzt, wobei das Verfahren die folgenden Schritte umfaBt:
10
arbre de tassement, rouleau et patin, lequel moyen
de compactage comprend un premier dispositif de
compactage qui, lorsque la machine fonctionne et
que les palettes pour tuiles sont acheminees
comme susmentionne, dirige et compacte du mortier sur et/ou dans des portions selectionnees uniquement desdites palettes, lesdites portions
selectionnees formant, entre autres, des nervures
de renfort longitudinales dans des tuiles finies.
2.
is
a) Versorgen eines Verdichtungsmittels, das 20
der PreBwelle, der Walze und der Streichvorrichtung vorgeschaltet ist, mit Mortel;
b) Bewirken, daB die Dachsteinpaletten der
Reihe nach unterhalb des Verdichtungsmittels
zugefiihrt werden, wo Mortel wahrend der 25
Durchfiihrung des Verfahrens nur auf und/oder
in ausgewahlte Teile der Paletten geleitet und
3.
verdichtet wird, wobei die ausgewahlten Teile
Verstarkungslangsrippen in dem fertigen
Dachstein bilden;
30
c) Zufiihren der Paletten mit den mit Mortel
bedeckten und/oder gefiillten ausgewahlten
Teilen der Reihe nach unterhalb der PreBwelle,
der Walze und der Streichvorrichtung, wobei
wahrend der Durchfiihrung des Verfahrens 35 4.
weiterer Mortel auf die Paletten und den schon
auf und/oder in den ausgewahlten Teilen der
Paletten verdichteten Mortel geleitet wird,
damit auf den Paletten ein zusammenhaltendes, durchgehendes Mortelband gebildet wird; 40
5.
d) Schneiden des Mortelbandes, so daB
getrennte Dachsteine in "griinem Zustand" auf
einzelnen Paletten gebildet werden; und
e) Bewirken des Aushartens der Dachsteine in
45
"griinem Zustand".
Revendications
1. Machine a fabriquer des tuiles comprenant une tremie pourvue d'un arbre de tassement, d'un rouleau
et d'un patin, ledit arbre de tassement servant, lorsque la machine fonctionne et que des palettes pour
tuiles sont acheminees en serie sous ladite tremie,
a diriger du mortier sur lesdites palettes au fur et a
mesure qu'elles passent en-dessous du rouleau et
patin pour former un ruban continu de mortier sur
lesdites palettes, caracterisee en ce que la
machine a fabriquer des tuiles comprend egalement un moyen de compactage en amont desdits
so
55
6
10
6.
Machine a fabriquer des tuiles selon la revendication 1, caracterisee en outre en ce que ledit moyen
de compactage comprend egalement un second
dispositif de compactage dans lequel, lorsque la
machine fonctionne, et apres que le premier dispositif de compactage a dirige et compacte du mortier
sur et/ou dans les portions selectionnees des palettes comme susmentionne, le second dispositif de
compactage compacte davantage le mortier dans
lesdites portions selectionnees uniquement des
palettes au fur et a mesure que les palettes passent
en dessous de lui, pour compacter entierement le
mortier des portions formant les nervures de renfort
longitudinales dans la tuile finie comme susmentionne.
Machine a fabriquer des tuiles selon I'une ou I'autre
des revendications 1 et 2, dans laquelle le premier
dispositif de compactage comprend une roue a
dents multiples disposee en fonctionnement de
maniere a surmonter les portions selectionnees
uniquement desdites palettes comme susmentionne.
Machine a fabriquer des tuiles selon la revendication 3, dans laquelle la roue a dents multiples a une
largeur efficace correspondant a la largeur des nervures de renfort longitudinales formees par lesdites
portions selectionnees uniquement des palettes.
Machine a fabriquer des tuiles selon I'une ou I'autre
des revendications 3 et 4, dans laquelle le second
dispositif de compactage comprend un mince element de lame de calibrage s'etendant parallelement ou substantiellement parallelement a la
direction d'avance des palettes acheminees en
serie sous ladite tremie, I'element de lame comprenant une portion de lame arrangee de maniere a
s'etendre dans ou vers une portion de bee pourvue
lors du fonctionnement de la machine a fabriquer
des tuiles et formee entre un chemin circonferentiel
produit par les dents de la roue a dents multiples et
les portions de surface superieure coplanaires desdites palettes acheminees en dessous.
Machine a fabriquer des tuiles selon la revendication 5, dans laquelle ledit element de lame a une
longueur efficace de 0,1 a 0,3 fois la longueur des
palettes pour tuiles utilisees conjointement.
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7.
8.
9.
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Machine a fabriquer des tuiles selon I'une quelconque des revendications precedentes, dans laquelle
le moyen de compactage est situe dans ladite tremie en amont de I'arbre de tassement, du rouleau
et du patin, comme susmentionne.
5
Machine a fabriquer des tuiles selon I'une quelconque des revendications 1 a 6, dans laquelle le
moyen de compactage peut etre situe dans une
seconde tremie situee en amont de ladite tremie.
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Procede de fabrication de tuiles pour toiture en
beton, utilisant la machine a fabriquer des tuiles
des revendications precedentes, ladite machine a
fabriquer des tuiles etant pourvue d'une tremie supportant un arbre de tassement, un rouleau et un
patin, tous de configuration connue, ledit procede
comprenant les etapes consistant a :
a) fournir du mortier a un moyen de compactage situe en amont desdits arbre de tassement, rouleau et patin;
b) faire en sorte que les palettes pour tuiles
soient acheminees en serie en dessous dudit
moyen de compactage au niveau duquel, lorsque le procede est effectue, du mortier est
dirige et compacte sur et/ou dans des portions
selectionnees uniquement desdites palettes,
lesdites portions selectionnees formant des
nervures de renfort longitudinales dans la tuile
finie;
c) acheminer lesdites palettes avec lesdites
portions selectionnees recouvertes et/ou remplies de mortier en serie en dessous desdits
arbres de tassement, rouleau et patin, grace a
quoi, au fur et a mesure que le procede est
effectue, du mortier supplemental est dirige
sur lesdites palettes et le mortier deja compacte sur et/ou dans lesdites portions selectionnees desdites palettes pour former un
ruban continu homogene de mortier sur lesdites palettes;
d) decouper ledit ruban de mortier pour former
des tuiles distinctes "a I'etat cru" sur des palettes individuelles; et
e) faire en sorte que lesdites tuiles "a I'etat cru"
soient cuites.
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20
25
30
35
40
45
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12
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