Canadian Patents Database / Patent 2865767 Summary

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(12) Patent Application: (11) CA 2865767
(54) English Title: SYSTEM TO EVACUATE MATERIALS FROM A CHAMBER
(54) French Title: SYSTEME D'EVACUATION DE MATERIAUX D'UNE CHAMBRE
(51) International Patent Classification (IPC):
  • B08B 9/087 (2006.01)
  • A01C 3/02 (2006.01)
  • A01F 25/20 (2006.01)
  • B01D 21/24 (2006.01)
  • B02C 18/00 (2006.01)
  • B26D 1/10 (2006.01)
  • B26D 7/32 (2006.01)
  • B65G 65/06 (2006.01)
  • C05F 17/02 (2006.01)
(72) Inventors :
  • LEVEILLEE, FRANCOIS (Canada)
  • ZEGAN, DAN (Canada)
(73) Owners :
  • INSTITUT DE RECHERCHE ET DE DEVELOPPEMENT EN AGROENVIRONNEMENT INC. (Not Available)
(71) Applicants :
  • INSTITUT DE RECHERCHE ET DE DEVELOPPEMENT EN AGROENVIRONNEMENT INC. (Canada)
(74) Agent: ROBIC
(74) Associate agent:
(45) Issued:
(86) PCT Filing Date: 2013-03-14
(87) Open to Public Inspection: 2013-09-26
Examination requested: 2018-03-07
(30) Availability of licence: N/A
(30) Language of filing: English

(30) Application Priority Data:
Application No. Country/Territory Date
61/613,649 United States of America 2012-03-21

English Abstract

The system has a grating extending between and below the walls, as a bottom of the chamber; and a knife having a blade cross-section oriented parallel to the grating, the knife being movable along knife path oriented parallel to and positioned above the grating.


French Abstract

Système comportant une grille s'étendant entre les parois et au-dessous de celles-ci, sous la forme d'une partie inférieure de la chambre ; et couteau ayant une section transversale de lame orientée parallèlement à la grille, le couteau étant mobile le long d'une trajectoire de couteau parallèlement à la grille et au-dessus de celle-ci.


Note: Claims are shown in the official language in which they were submitted.

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WHAT IS CLAIMED IS:
1. A system to evacuate biomass from a chamber having at least two walls each
corresponding to an associated wall plane, the system comprising :
a grating extending between two of said wall planes and forming a bottom of
the chamber;
a knife having an elongated main blade portion extending between the two of
said wall planes, above the grating, the elongated main blade portion
having an elongated cross-section oriented parallel to the grating and
two opposite downwardly sloping faces each leading to a
corresponding opposite cutting edge; the knife having at least two
guiding members, each guiding member being positioned on a
corresponding side of the elongated main blade portion;
at least two parallel knife guides, each one of the at least two knife guides
receiving a corresponding guiding member of the knife, the at least two
knife guides collaborating in guiding the knife along a knife path
oriented parallel to both the grating and the wall when the knife is
moved along the knife path;
two elongated and flexible traction elements, each one connected to a
corresponding side of the main blade portion, being pullable
collaboratively to move the knife along the knife path;
whereby a portion of the biomass in the chamber is evacuated through the
grating when the knife is pulled along the knife path.
2. The system of claim 1, wherein the elongated and flexible traction elements
are
in the formed of closed loops engagingly wrapped at both ends around
corresponding rotary elements, at least some of the rotary elements being
drivable
to pull the traction elements collaboratively and move the knife along the
knife path.
3. The system of claim 2 wherein the rotary elements are drivable in any one
of two
opposite directions, to pull the traction elements collaboratively and move
the knife
along the knife path in a corresponding one of two opposite directions.

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4. The system of claim 2 wherein the elongated and flexible traction elements
are in
the form of closed loop chains, each closed-loop chain being parallel to the
knife
guides and being geared at two opposite ends to corresponding sprockets.
5. The system of claim 4 wherein the sprockets of each one of the two opposite

ends are interconnected by a shaft, at least one of the shafts being a driven
shaft.
6. The system of claim 5 wherein both of the shafts are driven shafts.
7. The system of claim 1 wherein the knife guides include two guide rails
slidingly
receiving the corresponding guiding members of the knife.
8. The system of claim 1 wherein the knife path is spaced from the grating by
a
spacing distance.
9. The system of claim 8 wherein the cutting edges are at a bottom of the
blade
cross-section and spaced from the grating by the spacing distance.
10. The system of claim 9 wherein the elongated cross-section is taken along a

vertical plane parallel to the parallel knife guides, is symmetrical along a
vertical
axis of symmetry, and is elongated in the direction parallel to the grating.
11. The system of claim 10 wherein the blade cross-section has a regular
trapezoid
shape.
12. The system of claim 9 wherein the spacing distance is greater than 1/16".
13. The system of claim 12 wherein the spacing distance is of between 1/8" and
14. The system of claims 1 further comprising means to pull the traction
elements
collaboratively to move the knife along the knife path.
15. The system of claim 1 wherein the grating extends below at least two of
the
walls.
16. The system of claim 15 wherein the traction elements are located outwardly
of
the two of said wall planes.

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17. The system of claim 1 wherein the grating includes a set of parallel
interspaced
elements forming a set of parallel apertures.
18. The system of claim 17 wherein the grating has an area of lower aperture
density adjacent each one of the two of said wall planes.
19. The system of claim 17 wherein the grating has two lateral sections and a
central section therebetween, each lateral section being adjacent a
corresponding
one of the two of said wall planes, both of said lateral sections having a
lower
aperture density than the central section.
20. The system of claim 17 wherein the set of parallel interspaced elements
has a
set of metal bars oriented parallel to the walls and received on a framework
oriented normal to the walls.
21. The system of claim 1 further comprising a conveyor positioned under the
grating, to receive and convey biomass sent through the grating by the
movement
of the knife during use.
22. A system to evacuate biomass from a chamber having at least two parallel
walls, each corresponding to an associated wall plane, the system comprising :
a grating extending between two of said wall planes and forming a bottom of
the chamber;
a knife having an elongated main blade portion extending between the two of
the wall planes, above the grating, the elongated main blade portion
having an elongated cross-section oriented parallel to the grating and
at least one downwardly sloping face leading to a corresponding
cutting edge,
at least two knife movers, each knife mover being associated with a
corresponding one of the two of the wall planes, each one of the knife
movers movably connecting a portion of the knife located on a
corresponding side of the main blade portion to a corresponding side
of the chamber, the knife movers being operable collaboratively to

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move the knife along a knife path oriented parallel to both the grating
and the wall planes.
23. The system of claim 22, wherein the at least two knife movers includes
at least two parallel knife guides, each one of the at least two knife guides
receiving a corresponding guiding member of the knife, the at least two
knife guides collaborating in guiding the knife along the knife path; and
two elongated and flexible traction elements, each one connected to a
corresponding side of the main blade portion to move the knife
along the knife guides.

Note: Descriptions are shown in the official language in which they were submitted.

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SYSTEM TO EVACUATE MATERIALS FROM A CHAMBER
FIELD
[0001] The improvements generally relate to the field of material
handling, and more
particularly to removing shovelable materials in an elongated chamber from
below, and
even more particularly to a system achieving this using a knife and grating
combination.
BACKGROUND
[0002] Various applications exist in which biomass, typically in the form
of particulate
solids or semi-solids which have a consistency allowing them to be shoveled
(which will
be generally referred to herein as shovelable biomass), are maintained in
chambers for
given periods of time. Examples include : composting, maturation or digesting
chambers
for manure, compost, residual organic materials, etc.; drying chambers such as
for
biodrying processes; storage chambers for animal feed, hay, corn, litter,
etc.; to name a
few. The biomass can also include ash, for instance. In many cases, such
chambers
allow the ad hoc or regular addition of new materials, typically from above,
and are
provided with a system to evacuate older materials from below. The new
materials
eventually move down under the action of gravity as materials are removed from
below in
an action sometimes referred to as plug flow, and new materials can be added
above
such as to maintain a given level, or as they become available, for instance.
[0003] Systems have been devised in the past to address challenges in removing
such
materials from below. Previous approaches include the use of screw conveyors
for
instance. Although previous approaches have been satisfactory to a certain
degree, there
remained room for improvement to address the challenges inherent to the
particular
nature of evacuating such materials in en elongated chamber from below in
contexts
such as referred to above, in particular:
[0004] 1) there remained a need for a system providing satisfactory
evacuation with a
reduced amount of stress to the components and/or reduced amount of energy to
activate the system, in a context where there is an effort to reduce the
amount of mobile
components and/or overall costs of the system;
[0005] 2) portions of means to activate mobile components of former systems
which
were positioned within the chamber imposed limitations concerning maintenance
and
durability;

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[0006] 3) in applications such as biodrying and/or composting, material
had a
tendency to dry more rapidly in the vicinity of the walls of the chamber, and
this could
lead to unequal evacuation of the material, with the dryer material being
evacuated more
rapidly.
SUMMARY
[0007] In accordance with a general aspect, the approaches described
herein typically
involve moving some form of knife over some form of grating. The grating acts
as a
bottom of the chamber and has an apertured configuration designed to withstand
the
weight of the shovelable biomass in the chamber above it in the absence of an
external
influence, but to allow passage of a limited amount of the materials
therethrough when
the knife is moved through the materials above the grating. In particular, the
following
solutions are presented :
[0008] 1) it was found that using a knife having a blade cross-section
with a
downwardly sloping face leading to a cutting edge, preferably spaced from the
grating by
a spacing distance, can lead to a satisfactory low amount of stress to the
components
and/or reduced amount of energy to move the knife, which, in turn, can allow
using a
single knife to remove biomass from an elongated chamber having much longer
dimensions than that which was achievable using traditional systems;
[0009] 2) it was found that positioning portions or components of means
to move the
knife externally of the chamber could improve durability thereof and/or reduce
a burden
of maintenance compared to components positioned internally to the chamber;
[0010] 3) it was found that using a grating having higher density
portions (i.e. portions
having a lower aperture density) adjacent the walls could compensate the
tendency of
dryer material to escape more freely and lead to a more uniform evacuation of
the
material for drying, biodrying, or composting applications to name a few.
[0011] In accordance with one aspect, there is provided a system to
evacuate biomass
from a chamber having at least two walls each corresponding to an associated
wall
plane, the system comprising : a grating extending between two of said wall
planes and
forming a bottom of the chamber; a knife having an elongated main blade
portion
extending between the two of said wall planes, above the grating, the
elongated main
blade portion having an elongated cross-section oriented parallel to the
grating and two

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opposite downwardly sloping faces each leading to a corresponding opposite
cutting
edge; the knife having at least two guiding members, each guiding member being

positioned on a corresponding side of the elongated main blade portion; at
least
two parallel knife guides, each one of the at least two knife guides receiving
a
corresponding guiding member of the knife, the at least two knife guides
collaborating in
guiding the knife along a knife path oriented parallel to both the grating and
the wall when
the knife is moved along the knife path; two elongated and flexible traction
elements,
each one connected to a corresponding side of the main blade portion, being
pullable
collaboratively to move the knife along the knife path; whereby a portion of
the biomass
in the chamber is evacuated through the grating when the knife is pulled along
the knife
path.
[0012] In accordance with another aspect, there is provided a system to
evacuate
biomass from a chamber having at least two parallel walls, each corresponding
to an
associated wall plane, the system comprising : a grating extending between two
of said
wall planes and forming a bottom of the chamber; a knife having an elongated
main
blade portion extending between the two of the wall planes, above the grating,
the
elongated main blade portion having an elongated cross-section oriented
parallel to the
grating and at least one downwardly sloping face leading to a corresponding
cutting
edge, at least two knife movers, each knife mover being associated with a
corresponding
one of the two of the wall planes, each one of the knife movers movably
connecting a
portion of the knife located on a corresponding side of the main blade portion
to a
corresponding side of the chamber, the knife movers being operable
collaboratively to
move the knife along a knife path oriented parallel to both the grating and
the wall planes.
[0013] In accordance with another aspect, there is provided a system to
evacuate
materials from a chamber having walls, the system comprising : a grating
extending
between and below the walls, as a bottom of the chamber; and a knife having a
blade
cross-section oriented parallel to the grating and having a downwardly sloping
face
leading to a cutting edge, the knife being movable along knife path oriented
parallel to
and positioned above the grating, and spaced from the grating by a spacing
distance.
[0014] In accordance with another aspect, there is provided a system to
evacuate
materials from a chamber including two parallel walls, the system comprising :
a grating
extending between and below the walls, as a bottom of the chamber; a knife
having a

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blade cross-section oriented parallel to the grating, the knife being movable
along knife
path oriented parallel to and positioned above the grating and oriented
parallel to the two
parallel walls; and means to move the knife along the knife path, the means to
move the
knife being located outwardly of the two parallel walls and acting on two
opposite ends of
the knife.
[0015] In accordance with another aspect, there is provided a system to
evacuate
materials from a chamber having walls, the system comprising : a grating
extending
between and below the walls, as a bottom of the chamber, the grating having
portions
adjacent the walls which have a lower aperture density; and a knife having a
blade cross-
section oriented parallel to the grating, the knife being movable along knife
path oriented
parallel to and positioned above the grating.
[0016] Many further features and combinations thereof concerning the
present
improvements will appear to those skilled in the art following a reading of
the instant
disclosure.
DESCRIPTION OF THE FIGURES
[0017] In the figures,
[0018] Fig. 1 is a side elevation view of an example of an elongated
chamber and
system to evacuate materials therefrom;
[0019] Fig. 2A is a front elevation view of the chamber and system of
Fig. 1, Fig. 2B
being an enlarged portion of Fig. 2A to show detail;
[0020] Fig. 3 is a top plan view of the system of Fig. 1 shown alone;
[0021] Fig. 4A is a cross-sectional view of a knife of the system of Fig.
1 and Fig. 4B is
a variant thereof;
[0022] Fig. 5 is a front elevation view of a variant of the system of
Fig. 1, specifically
adapted for retrofitting to a concrete chamber.
DETAILED DESCRIPTION
[0023] Fig. 1 shows an example of a system 10 to evacuate materials from
an
elongated chamber. In this example, the chamber 12 has a regular rectangular
prism

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shape formed by a first set of two parallel walls (referred to herein as side
walls 14, 16)
and a second set of two parallel walls perpendicular to the first set
(referred to herein as
end walls 18, 20). The chamber 12 is designed to receive biomass having a
shovelable
consistency from above, for the biomass to be laterally trapped in the chamber
12 and
contained by the four walls 14, 16, 18, 20. In the figures, the biomass is not
illustrated for
purposes of clarity, but an exemplary level 22 thereof is schematized by
dashed line. It is
to be understood that the exemplary shape of the chamber 12 is for
illustrative purposes
only and can vary in alternate embodiments.
[0024] The system 10 to evacuate materials from the chamber 12 includes a
knife 24
which is movable across the biomass along a knife path 26. The knife 24 works
in
collaboration with an apertured bottom of the chamber 12 which is referred to
herein as a
grating 28. The apertures in the grating 28 are designed small enough to hold
the
shovelable biomass under its own weight in the absence of other influences.
However,
the apertures in the grating 28 are designed large enough to allow passage, or
evacuation, of the shovelable biomass in the vicinity of where it is disturbed
by the
passage of the knife 24.
[0025] In this particular embodiment, the walls are planar, and can be
said to be
associated to corresponding wall planes. The wall planes are virtual and
project from the
ends of the walls in a manner that even in the example embodiment shown in
Fig. 1,
where the grating actually extends below the walls and laterally past the
walls, the grating
can be said to extend between the wall planes.
[0026] For the effect of the knife 24 to be uniform along the entire
length of the
biomass contained in the chamber, the apertures in the grating 28 can have a
regular
pattern, the knife 24 can be moved at a constant speed, the level of the
biomass can be
roughly constant along the length of the chamber 12, and the knife path 26 can
be
parallel to the grating 28.
[0027] Although parallel to the grating 28, the knife path 26 is spaced
from it by a
spacing distance d. Tests have shown better results when the spacing distance
d was
used, compared to embodiments where the knife path lay immediately adjacent to
the
grating. In the tests, the blade cross-section thickness was selected to 1.5
inches, and
the spacing was of 1/8" and of %", which provided satisfactory results
compared to
sliding the knife immediately adjacent the grating. In alternate embodiments,
the spacing

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can be of % of the thickness of the blade cross-section or lower, for
instance. In this
embodiment, the spacing distance d can be greater than 1/16"; preferably of
1/8" or
greater; about %", or even greater than 1/4", for instance.
[0028] Henceforth, upon a passage of the knife 24 along the knife path
26, a relatively
uniform amount of biomass passes through the grating 28 along the entire
length of the
chamber 12. The biomass which has passed through the grating 28 can fall to
the ground
for manual retrieval, or on an optional conveyor system 30 for automated
retrieval, for
instance.
[0029] In this embodiment, the knife 24 extends perpendicularly relative
to the knife
path 26. The knife 24 can have a regular blade cross-section 32 along its
length, the
blade cross-section 32 being taken along a vertical plane parallel to the
knife path 26.
The blade cross-section 32 is elongated in the direction of the knife path 26.
[0030] An example of a blade cross-section 32 is shown in greater detail
in Fig. 4A. In
this embodiment, the blade cross-section 32 is designed to cut in a similar
manner in
both directions, therefore, the blade cross-section 32 has a symmetrical
design relative to
a vertical axis of symmetry 34 and the elongated shape thereof is oriented
parallel to the
knife path 26. Looking to either symmetrical end, the blade cross-section can
be seen to
have a downwardly sloping face 36 leading to a cutting edge 38. The blade 32
is thus
made thick enough at its core 40 to withstand the resistance pressure from the
biomass
as it is moved across it and to remain straight along its length under its own
weight, and a
cutting edge 38 is provided to effectively cut the biomass for the portion
underneath the
blade 32 as it continues to move to at least partially fall through the
apertures in the
grating. The downwardly sloping face 36 has the effect of a ramp as the blade
32 is
moved through the biomass, pushing the biomass located in the knife path above
the
blade 32 as the knife 24 is moved across it. This upward movement of the
biomass is
likely to propagate along at least a portion of the thickness of the biomass
and produce a
shaking effect which can be beneficial in applications such as material
drying, biodrying
or composting for instance. In this particular embodiment, the blade cross-
section 32
more precisely has an elongated regular trapezoid shape, and the sloping faces
36 are
inclined between 10 and 40 , preferably between 15 and 30 relative the
horizontal, and
the cutting edges 38 are located directly at the bottom of the blade-cross-
section 32 and
thus spaced from the grating 28 by the spacing distance.

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[0031] Fig. 4B shows an alternate embodiment where each end of the blade
cross
section 132 has both an upwardly sloping face 134 and a downwardly sloping
face 136.
Such an alternate embodiment can be satisfactory for certain applications.
However, care
is recommended when designing blade cross-sections having upwardly sloping
faces
because a test which was done with the blade cross-section shown in Fig. 4A
flipped
upside-down has provided a negative result ¨ presumably since the sloping face
was
then oriented in a manner to squeeze the biomass against the grating creating
an
undesirably high level of stress in the components. Nonetheless, results may
vary
depending on the type of biomass, for instance, and blade cross-sections
having
upwardly oriented sloping faces may still be preferred in some alternate
applications.
[0032] Referring back to Fig. 1, means are provided to move the knife 24
along the
knife path 26. In the illustrated embodiment, the means to move the knife can
be referred
to as knife movers, and include two parallel closed-loop chains 42, 44, each
one being
attached to a corresponding end of the knife 24, and each one being engaged at
two
opposite ends to corresponding sprockets 46, 48, 50, 52. Henceforth, rotation
of the
sprockets 46, 48, 50, 52 drives the chains 42, 44, which, in turn, move the
knife 24 along
the knife path 26.
[0033] In alternate embodiments, the knife movers can include an other
form of
elongated and flexible traction element than a chain, such as a cable or a
belt, for
instance. When provided in the form of a closed loop, the traction element can
be
engagingly wrapped with rotary elements. In the case of a cable or belt, the
rotary
elements can be provided in the form of pulleys rather than sprockets, for
instance. In
alternate embodiments, the elongated and flexible traction elements can be
provided in
an other form than in the form of a closed loop. For example, flexible
traction elements
can be provided in the form of chains having a free end extending past an end
wall,
which can be pulled by a tractor or the like to move the knife.
[0034] Turning now to Fig. 2, it is shown that in this particular
embodiment, the knife
24 has two end members 54, 56, each one provided at a corresponding end of the
blade.
The portion of the blade extending between the two end members 54, 56 can be
referred
to as a main blade portion, because in alternate embodiments, the knife can
include
additional blade portions which extend past the end members 54, 56. The closed-
loop
chains 42, 44 can be attached to the end members at fastening points 58, 60.
In this

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embodiment, the knife movers can further be said to include knife guides
provided, in this
example, in the form of guide rails 62, 64 which can guidingly receive the
knife. More
precisely, in this embodiment, each end member 54, 56 is slidingly received in
a
corresponding guide rail 62, 64, both being oriented parallel to the side
walls 14, 16 of
the chamber 12, and the end members 54, 56 can thus be referred to as guide
members
or sliding elements. During use, the guide rails 62, 64 guide the movement of
the knife 24
along the knife path 26 as it is pulled by the closed-loop chains 42, 44, and
lower flanges
66 thereof, along which the end members 54, 56 rest, cooperate with the end
members
54, 56 in establishing the spacing distance d between the blade of the knife
24 and the
grating 28. In this embodiment, side flanges 68 and upper flanges 70 are also
provided to
form an overall c-shape for further guidance. To effectively slide in the
guide rails 62, 64,
the end members 54, 56 can be provided in the form of sliding elements. For
instance,
the end members 54, 56 can be made of a sliding material such as Teflon or
HDPE, for
instance, and have a flat sliding face, and the guide rails 62, 64 can have a
cooperating
flat sliding face of a material such as stainless steel, for instance.
Alternately, the end
members can be provided with wheels or sprockets, for instance. If sprockets
are used,
the knife guides can include a linear gear to receive the sprockets, for
instance. If wheels
or sprockets are used as a portion of the knife movers, the wheels or
sprockets can be
motorized as an alternative to using chains, for instance. Another example of
alternate
means to move the knife can include mounting the knife to an endless screw
arrangement oriented in the direction of the knife path, the endless screws
can move the
knife in an orientation guided by the orientation of the screws, in either
direction, the
endless screw arrangement can thus contribute to form knife movers with mating
portions
of the knife, and also knife guides.
[0035] Referring still to Fig. 2, in this embodiment, the ends of the knife
24 and the
guide rails 62, 64 can be seen to protrude laterally (i.e. to be positioned
outwardly) from
the locations of the side walls 14, 16 of the chamber 12. Henceforth, not only
does the
blade extend continuously along the entire width of the chamber 12, but the
end
members 54, 56 can be exposed and be accessible externally, even when the
chamber
12 is filled with biomass. This feature can be very handy in the event of
malfunctions or
problems with the device, because the knife 24, closed loop chains 42, 44 and
guide rails
62, 64, to name a few components, can be accessible for repair or maintenance
without
having to engage the demanding task of emptying the chamber 12. The spacing
between
the guide rails 62, 64 and the side walls 14, 16 and between the guide rails
62, 64 and

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the grating 28 can be maintained at a minimum to reduce the likelihood of
biomass
escaping laterally. The grating 28 can extend right up to the guide rails 62,
64 or even
optionally exceed them laterally if preferred.
[0036] Turning now to Fig. 3, the sprockets 46, 48, to which a first end
of both closed
loop chains 42, 44 are engaged can be interconnected by a first shaft 72, and
the
sprockets 50, 52 to which the second end of both closed loop chains 42, 44 are
engaged
can be interconnected by a second shaft 74. The interconnection by shafts as
shown can
help maintaining the speed of both chains 42, 44 equal during movement of the
knife 24,
which, in turn, can maintain the orientation of the knife 24 perpendicular to
the chains 42,
44 and the side walls 14, 16. A perpendicular orientation can be preferred in
applications
where the resistance of the biomass to the movement of the knife 24 is
significant, for
instance.
[0037] If using chains to impart movement to the knife 24, such as in the
illustrated
embodiment, and the length of the chamber 12 is significant, the driving of
both
corresponding sprockets can be preferred rather than only having one drive
sprocket at a
given end of the chain and an idle sprocket at the other. In this manner, to
move the knife
24, the sprockets at the end toward which the knife is moved are driven and
the
sprockets at the other end are left idle, and vice versa when moving the knife
in the other
direction. In this manner, the maximum length of chain in traction between the
driving
sprockets and the knife will not exceed the entire length of the chamber which
limits the
amount of stretching. Furthermore, in this manner, slack in the chain will
tend to appear
in the lower portion thereof and not in the upper portion, which could be
problematic. In
this embodiment, this is achieved by a first drive motor 76 to drive the first
shaft 72 and
first sprockets 46, 48 in a first direction, and a second drive motor 78 to
drive the second
shaft 74 and second sprockets 50, 52 in the other direction. Alternate means
to move the
knife can use cables or belts and pulleys instead of chains and sprockets, for
instance.
[0038] Any suitable form of grating 28 which holds the biomass when it is
not disturbed
by the passage of the knife 24 and which allows passage of a controlled amount
upon
passage of the knife 24 can potentially be suitable for a given application. A
regular
aperture pattern in the grating 28 can potentially be easier to manufacture
and can thus
be favoured over an irregular aperture pattern. In the embodiment shown in
Fig. 3, a
regular aperture pattern 28 is achieved by using a grating which includes a
set of parallel

CA 02865767 2014-08-28
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PCT/CA2013/050196
- 10 -
interspaced elements 80 forming a set of parallel apertures. The parallel
interspaced
elements 80 can be metal bars for instance, and can be oriented parallel to
the side walls
14, 16. In this embodiment, the metal bars are received on a framework
consisting of a
second set of metal bars 82 which are oriented normal to the side walls 14,
16.
[0039] In applications such as biodrying, for instance, the grating 28 can
not only serve
as the interface for biomaterial extrusion, but also as an inlet to draw in a
substantially
uniform amount of air in to dry the biomass in the chamber 12. In such
applications, the
top of the chamber 12 can be closed, for instance, to allow the setting of a
negative
pressure inside the chamber 12 which favours the air intake through the
grating 28. The
[0040] Fig. 5 provides an example of an alternate embodiment. This
particular
alternate embodiment is similar to the embodiment shown in Fig. 2, except for
the fact
that it is entirely fitted between two walls which can be concrete walls for
instance. This
alternate embodiment is a good example of an embodiment which can be
retrofitted to a

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- 11 -
[0041] As can be understood, the examples described above and illustrated
are
intended to be exemplary only. The scope is indicated by the appended claims.

A single figure which represents the drawing illustrating the invention.

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Admin Status

Title Date
Forecasted Issue Date Unavailable
(86) PCT Filing Date 2013-03-14
(87) PCT Publication Date 2013-09-26
(85) National Entry 2014-08-28
Examination Requested 2018-03-07

Abandonment History

There is no abandonment history.

Maintenance Fee

Description Date Amount
Last Payment 2019-03-04 $200.00
Next Payment if small entity fee 2020-03-16 $100.00
Next Payment if standard fee 2020-03-16 $200.00

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  • the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
  • the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Filing $400.00 2014-08-28
Maintenance Fee - Application - New Act 2 2015-03-16 $100.00 2014-08-28
Maintenance Fee - Application - New Act 3 2016-03-14 $100.00 2016-01-07
Maintenance Fee - Application - New Act 4 2017-03-14 $100.00 2017-02-14
Maintenance Fee - Application - New Act 5 2018-03-14 $200.00 2018-03-06
Request for Examination $200.00 2018-03-07
Maintenance Fee - Application - New Act 6 2019-03-14 $200.00 2019-03-04
Current owners on record shown in alphabetical order.
Current Owners on Record
INSTITUT DE RECHERCHE ET DE DEVELOPPEMENT EN AGROENVIRONNEMENT INC.
Past owners on record shown in alphabetical order.
Past Owners on Record
None
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.

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Document
Description
Date
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Number of pages Size of Image (KB)
Abstract 2014-08-28 1 57
Claims 2014-08-28 4 119
Drawings 2014-08-28 5 170
Description 2014-08-28 11 500
Cover Page 2014-11-19 1 40
Representative Drawing 2014-10-08 1 11
Assignment 2014-08-28 4 189
PCT 2014-08-28 3 115
Correspondence 2016-05-11 3 121
Correspondence 2016-06-17 1 21
Correspondence 2016-06-17 1 23
Fees 2017-02-14 1 33
Fees 2018-03-06 1 33
Prosecution-Amendment 2018-03-07 2 61
Prosecution-Amendment 2018-12-04 4 193
PCT 2014-08-29 8 465
Claims 2014-08-29 3 159
Prosecution-Amendment 2019-06-03 12 422
Claims 2019-06-03 5 192
Description 2019-06-03 13 593
Correspondence 2019-09-20 2 61