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Patent 2653425 Summary

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(12) Patent: (11) CA 2653425
(54) English Title: MATERIAL SEPARATION SYSTEM FOR VACUUM TRUCK
(54) French Title: SYSTEME DE SEPARATION DE MATIERES POUR CAMION-VIDANGEUR
Bibliographic Data
(51) International Patent Classification (IPC):
  • E01H 1/08 (2006.01)
  • B60P 3/22 (2006.01)
  • E02F 3/88 (2006.01)
  • B08B 5/04 (2006.01)
(72) Inventors :
  • BAZIUK, SLAWKO MORRIS (Canada)
(73) Owners :
  • BAZIUK, SLAWKO MORRIS (Canada)
(71) Applicants :
  • BAZIUK, SLAWKO MORRIS (Canada)
(74) Agent: ADE & COMPANY INC.
(74) Associate agent:
(45) Issued: 2013-01-29
(22) Filed Date: 2008-12-15
(41) Open to Public Inspection: 2010-06-15
Examination requested: 2010-08-18
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): No

(30) Application Priority Data: None

Abstracts

English Abstract





A vacuum truck has a cylindrical tank which can be pivoted to
discharge through a rear door is arranged for transporting collected solids
while
liquid is extracted and returned. Two tank extraction outlets in the top wall
at the
front and rear are connected to the vacuum pump and each includes a float
valve
ball contained in a receptacle above the top wall as to allow the tank to be
filled to
the top wall. For separating the materials into liquid which is pumped away
and
solids for transportation, the tank includes a generally upstanding dividing
wall
across the tank having a bottom wall portion, which can pivot away as the tank
is
tilted, and has a top edge defining a weir over which liquid can flow into the
liquid
collection area, and an upper screening section defined by a support screen
and a
hanging chain curtain in front of the screen.


French Abstract

Un camion-vidangeur dispose d'un réservoir cylindrique qui peut être pivoté pour se décharger par une porte arrière sert à transporter des solides recueillis alors que le liquide est extrait et évacué. Les deux prises d'extraction du réservoir sur la paroi supérieure à l'avant et à l'arrière sont reliées à la pompe et chacune comporte un robinet à flotteur contenu dans un réceptacle au-dessus de la paroi supérieure pour permettre le remplissage du réservoir jusqu'à la paroi supérieure. Pour séparer les matières en liquide qui est pompé à l'extérieur et en solides qui seront transportés, le réservoir comprend une paroi de division généralement verticale traversant le réservoir ayant une portion de paroi inférieure, qui peut pivoter en s'éloignant lorsque le réservoir est incliné, et a un rebord supérieur définissant un déversoir par-dessus lequel le liquide peut s'écouler dans la zone de collecte de liquide et une section de filtre supérieure définie par un filtre-cadre et un rideau à chaîne suspendu devant le filtre.

Claims

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





14


CLAIMS:


1. A vacuum truck comprising:

a truck frame mounted on ground wheels;

a vacuum pump mounted on the truck frame for generating an air flow
through the pump to form a vacuum inlet on one side of the pump and an air
outlet
on an opposed side of the pump;

a vacuum hose having an inlet nozzle for communicating air flow from
a material to be vacuumed to carry the material in the air flow to a hose
outlet;

a storage tank having a tank inlet connected to the hose outlet of the
vacuum hose for receiving the material carried in the air flow;

at least one tank extraction outlet connected by a duct to the vacuum
inlet of the pump such that air flow is drawn from the tank by the vacuum pump

through the duct which generates the air flow in the vacuum hose to carry the
material;

the tank being arranged such that the materials carried in the airflow
are discharged from the airflow as the airflow passes through the tank from
the
vacuum hose to the tank extraction outlet;

the tank including a separation system therein for separating the
materials generally into a liquid component and a solids component;

a liquid pump mounted in the tank for extracting the separated liquid
component from the tank to increase a storage capacity of the tank for the
solids




15



component to be collected and transported in the tank on the truck to a remote

location for discharge;

a discharge door at one end of the tank for discharging the collected
solids component;

a lifting arrangement for tilting the tank so as to discharge the collected
solids component through the discharge door;

the separation system including a generally upstanding dividing wall
across the tank dividing a solids collection area on one side from a liquid
collection
area on the other side, with the solids collection area being located adjacent
the
discharge door, with the water pump having an inlet located in the liquid
collection
area and with the tank inlet located in the solids collection area;

the dividing wall having a bottom wall portion, which is substantially
imperforate and has a top edge at or adjacent a weir over which liquid can
flow into
the liquid collection area;

the dividing wall having an upper screening section, which is
perforated to allow the liquid to pass over the top edge into the liquid
collection area
while restricting passage of the solids;

wherein the upper screening section includes a hanging curtain formed
by a series of side by side lengths of chain.


2. The vacuum truck according to Claim 1 wherein the upper
screening section extends from the top edge to a top wall of the tank.




16



3. The vacuum truck according to Claim 1 or 2 wherein the lengths

of chain are connected to only at a top end so that the other end of each
length of
chain is free and the length is suspended vertically with the other end of the
lengths
of chain in contact with or closely adjacent the top edge of the bottom wall
portion.


4. The vacuum truck according to any one of Claims 1 to 3
wherein the bottom wall portion is mounted for pivotal movement so as to pivot

during tilting of the tank to allow discharge of materials collected at a
bottom of the
liquid collection area.


5. The vacuum truck according to Claim 4 wherein the bottom wall
portion is pivotal about a horizontal axis at or adjacent the top edge.


6. The vacuum truck according to Claim 4 or 5 wherein the bottom
wall portion reaches substantially to a bottom wall of the tank such that
substantially
all material at the bottom wall can discharge when the tank is tilted.


7. The vacuum truck according to Claim 4, 5 or 6 wherein there is
provided a stop to prevent pivotal movement of the bottom wall portion in a
direction
into the liquid collection area caused by weight of solids collected in the
solids
collection area.


8. The vacuum truck according to any one of Claims 1 to 7
wherein the liquid pump is a submersible pump mounted in the liquid collection
area
below the top edge.




17


9. The vacuum truck according to any one of Claims 1 to 8

wherein said at least one tank extraction outlet and the tank inlet are
mounted at a
top of the tank so as to allow the tank to be filled substantially to the top.


10. The vacuum truck according to any one of Claims 1 to 9
wherein said at least one tank extraction outlet includes a first tank
extraction outlet
in the liquid collection area and a second tank extraction outlet in the
solids
collection area.


11. The vacuum truck according to Claim 10 wherein the first tank
extraction outlet is mounted at an end of the tank remote from the discharge
door
and the second tank extraction outlet is mounted at the end of the tank
adjacent the
discharge door.


12. The vacuum truck according to any one of Claims 1 to 11
wherein said at least one tank extraction outlet includes a float valve
comprising a
float ball contained in a cage which is free to be floated upwardly by liquid
to engage
a valve seat to prevent passage of liquid into the duct to the vacuum pump and

wherein the valve seat is located in a receptacle for the float ball located
above a top
wall of the tank so as to allow the tank to be filled substantially to the top
wall.


13. The vacuum truck according to Claim 12 wherein the cage for
the float ball is formed from row of chains.


14. A vacuum truck comprising:

a truck frame mounted on ground wheels;




18


a vacuum pump mounted on the truck frame for generating an air flow

through the pump to form a vacuum inlet on one side of the pump and an air
outlet
on an opposed side of the pump;

a vacuum hose having an inlet nozzle for communicating air flow from
a material to be vacuumed to carry the material in the air flow to a hose
outlet;

a storage tank having a tank inlet connected to the hose outlet of the
vacuum hose for receiving the material carried in the air flow;

at least one tank extraction outlet connected by a duct to the vacuum
inlet of the pump such that air flow is drawn from the tank by the vacuum pump

through the duct which generates the air flow in the vacuum hose to carry the
material;

the tank being arranged such that the materials carried in the airflow
are discharged from the airflow as the airflow passes through the tank from
the
vacuum hose to the tank extraction outlet;

the tank including a separation system therein for separating the
materials generally into a liquid component and a solids component;

a liquid pump mounted in the tank for extracting the separated liquid
component from the tank to increase a storage capacity of the tank for the
solids
component to be collected and transported in the tank on the truck to a remote

location for discharge;

a discharge door at one end of the tank for discharging the collected
solids component;




19


a lifting arrangement for tilting the tank so as to discharge the collected
solids component through the discharge door;

the separation system including a generally upstanding dividing wall
across the tank dividing a solids collection area on one side from a liquid
collection
area on the other side, with the solids collection area being located adjacent
the
discharge door, with the water pump having an inlet located in the liquid
collection
area and with the tank inlet located in the solids collection area;

the dividing wall having a bottom wall portion, which is substantially
imperforate and has a top edge at or adjacent a weir over which liquid can
flow into
the liquid collection area;

the dividing wall having an upper screening section, which is
perforated to allow the liquid to pass over the top edge into the liquid
collection area
while restricting passage of the solids;

wherein the upper screening section includes a hanging curtain formed
by a series of side by side lengths of chain;

and wherein the upper screening section includes perforated screen
support on the side of the curtain which is within the liquid collection area
to prevent
the curtain from being forced into the liquid collection area by collection of
solids
within the solids collection area.


15. The vacuum truck according to Claim 14 wherein the lengths of
chain are connected to only at a top end so that the other end of each length
of




20


chain is free and the length is suspended vertically with the other end of the
lengths
of chain in contact with or closely adjacent the top edge of the bottom wall
portion.


16. The vacuum truck according to Claim 14 or 15 wherein the
bottom wall portion is mounted for pivotal movement about a horizontal axis at
or
adjacent the top edge so as to pivot during tilting of the tank to allow
discharge of
materials collected at a bottom of the liquid collection area.


17. The vacuum truck according to Claim 16 wherein there is
provided a stop to prevent pivotal movement of the bottom wall portion in a
direction
into the liquid collection area caused by weight of solids collected in the
solids
collection area.


18. The vacuum truck according to any one of Claims 14 to 17
wherein the liquid pump is a submersible pump mounted in the liquid collection
area
below the top edge.


19. The vacuum truck according to any one of Claims 14 to 18
wherein said at least one tank extraction outlet and the tank inlet are
mounted at a
top of the tank so as to allow the tank to be filled substantially to the top.


20. The vacuum truck according to any one of Claims 14 to 19
wherein said at least one tank extraction outlet includes a first tank
extraction outlet
in the liquid collection area at an end of the tank remote from the discharge
door and
a second tank extraction outlet in the solid collection area at the end of the
tank
adjacent the discharge door.




21



21. The vacuum truck according to any one of Claims 14 to 20

wherein said at least one tank extraction outlet includes a float valve
comprising a
float ball contained in a cage formed from row of chains which is free to be
floated
upwardly by liquid to engage a valve seat to prevent passage of liquid into
the duct
to the vacuum pump and wherein the valve seat is located in a receptacle for
the
float ball located above a top wall of the tank so as to allow the tank to be
filled
substantially to the top wall.

Description

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



CA 02653425 2012-06-18

MATERIAL SEPARATION SYSTEM FOR VACUUM TRUCK

This invention relates to a vacuum truck for vacuum extraction to a
storage tank of liquids and solids from an area to be cleaned, which uses a
separation system within the storage tank to remove liquid content from solids

content so as to allow the liquid to be returned to the area and to increase
the
amount of available transportation area within the tank for the solids to be
transported to a remote location.

BACKGROUND OF THE INVENTION

Vacuum trucks are well-known and widely used for excavation or
extraction of particulate material by vacuum from an area to be cleared, with
the
material collected being transported through a vacuum hose into a storage tank
from
which the material is separated from the air before the air enters the vacuum
pump.

Such vacuum trucks are commonly used for clearing pipes and other
areas where a collection of solid material needs to be extracted from an area
containing water. Thus a blocked sewer or drainage pipe contains water which
can
be returned to the pipe and a quantity of solids which must be removed.

One problem which arises with vacuum trucks of this type is that it is
desirable to increase as far as possible the amount of solids which can be
collected
so as to transport as much as possible of the material which must be removed
while

returning liquid to the area being cleaned. It will be appreciated that to
maximize the
amount of material carried in a load reduces the number of loads which must be


CA 02653425 2012-06-18

2
transported with the potential of significantly reducing total working time to
clear a
particular area or blockage.

US Patent 5,722,113 (of the present inventor Baziuk) issued March 3rd
1998 shows an arrangement for collecting dust and moisture where separate
collection tanks are provided on each side of the tank and contain hanging
chains

which form a screen. There is no disclosure of separation of liquid and solids
within
the tank.

US Patent 4,016,994 (Wurster) issued April 12th 1977 shows a two
tank system for collecting air transportable material which may be wet or dry
but
does not act to separate the wet from the dry.

US Patent 4,904,126 (Voith) issued February 27th 1990 shows a
vacuum truck for collecting primarily dry material which uses filter
cartridges to
separate the particulate materials from the air.

US Patent 6,453,584 (Buckner) issued September 24th 2002 shows an
arrangement in which the collected materials and separated into liquid and
solids
components using a vibrating screen onto which the material is deposited with
the
liquid falling through into a separate container. The materials are
continually
discharged so that the tank is not required as a transport container, thus
allowing the
separation system to take up a significant part of the tank.

US Patent 6,604,304 (Slabach) issued August 12th 2003 shows a
vacuum system with a slurry tank for transporting the extracted slurry
material.


CA 02653425 2012-06-18

3
There is no attempt to separate the liquid and solids content so that the
total of the
slurry needs to be transported.

US Patent 5,295,317 (Perrott) issued March 2snd 1994 shows an
excavation machine in which the collected materials and separated into liquid
and
solids components using a rotating screen. The materials are continually
discharged

so that the tank is not required as a transport container, thus allowing the
separation
system to take up a significant part of the tank.

SUMMARY OF THE INVENTION

It is one object of the invention to provide an improved vacuum truck
where there is provided a separation system within a transportation and
storage tank
to remove liquid content from solids content so as to allow the liquid to be
returned
and to increase the amount of available transportation area within the tank
for the
solids to be transported to a remote location.

According to one aspect of the invention there is provided a vacuum
truck comprising:

a truck frame mounted on ground wheels;

a vacuum pump mounted on the truck frame for generating an air flow
through the pump to form a vacuum inlet on one side of the pump and an air
outlet
on an opposed side of the pump;

a vacuum hose having an inlet nozzle for communicating air flow from
a material to be vacuumed to carry the material in the air flow to a hose
outlet;


CA 02653425 2012-06-18

4
a storage tank having a tank inlet connected to the hose outlet of the
vacuum hose for receiving the material carried in the air flow;

at least one tank extraction outlet connected by a duct to the vacuum
inlet of the pump such that air flow is drawn from the tank by the vacuum pump
through the duct which generates the air flow in the vacuum hose to carry the
material;

the tank being arranged such that the materials carried in the airflow
are discharged from the airflow as the airflow passes through the tank from
the
vacuum hose to the tank extraction outlet;

the tank including a separation system therein for separating the
materials generally into a liquid component and a solids component;

a liquid pump mounted in the tank for extracting the separated liquid
component from the tank to increase a storage capacity of the tank for the
solids
component to be collected and transported in the tank on the truck to a remote
location for discharge;

a discharge door at one end of the tank for discharging the collected
solids component;

a lifting arrangement for tilting the tank so as to discharge the collected
solids component through the discharge door;

the separation system including a generally upstanding dividing wall
across the tank dividing a solids collection area on one side from a liquid
collection
area on the other side, with the solids collection area being located adjacent
the


CA 02653425 2012-06-18

discharge door, with the water pump having an inlet located in the liquid
collection
area and with the tank inlet located in the solids collection area;

the dividing wall having a bottom wall portion, which is substantially
imperforate and has a top edge at or adjacent a weir over which liquid can
flow into
5 the liquid collection area;

the dividing wall having an upper screening section, which is
perforated to allow the liquid to pass over the top edge into the liquid
collection area
while restricting passage of the solids;

wherein the upper screening section includes a hanging curtain formed
by a series of side by side lengths of chain.

Preferably the upper screening section extends from the top edge to a
top wall of the tank to allow the tank to be filled to the top wall with the
solids.
Preferably the upper screening section includes a hanging curtain

formed by a series of side by side lengths of chain. Such hanging chain
lengths are
self cleaning and resistant to damage from heavy components in the solids.
Preferably the lengths of chain are connected only at a top end so that

the other end of each length of chain is free and the length of chain is
suspended
vertically with the other end of the lengths of chain in contact with or
closely adjacent
the top edge of the bottom wall portion.

Preferably the upper screening section includes a perforated screen
support on the side of the curtain which is within the liquid collection area
to prevent
the curtain from being forced into the liquid collection area by the weight of
collection


CA 02653425 2012-06-18

6
of solids within the solids collection area and thus to hold the solids in the
solid
collection area.

Other types of screening section can be used but the chains are
particular effective in that they are rugged and resistant to damage and self
cleaning.
The separating action is relatively crude since some solids can enter

the liquid area without causing a breakdown, blockage or damage. However the
intention is to extract as much water as is reasonably possible with a simple
rugged
system so as to increase the amount of solids contained.

Preferably the bottom wall portion is mounted for pivotal movement
about a horizontal axis at or adjacent the top edge so as to pivot during
tilting of the
tank to open and allow discharge of materials collected at a bottom of the
liquid
collection area. Also any liquid collecting behind the bottom portion which
acts as a
door can flow over the bottom of the tank in a cleaning action to help wash
away any
remaining solids at the bottom of the tank

Preferably the pivotal bottom wall portion or door reaches substantially
to a bottom wall of the tank so that effectively all material at the bottom
wall can
discharge by flowing over the bottom of the tank when the tank is tilted. Any
water
remaining at the bottom of the water collection area can be used to rinse the
remaining solids from the tan.

Preferably there is provided a back-stop to prevent pivotal movement
of the bottom wall portion or door in the reverse direction into the liquid
collection


CA 02653425 2012-06-18

7
area caused by the weight of solids collected in the solids collection area
and resting
against the door.

Preferably the liquid pump is mounted in the liquid collection area with
its inlet in a caged area inside the liquid collection area and below the top
edge.

Preferably the tank extraction outlet or outlets and the tank inlet are
mounted at a top of the tank so as to allow the tank to be filled
substantially to the
top.

Preferably the tank extraction outlets include a first tank extraction
outlet in the liquid collection area mounted at an end of the tank remote from
the
discharge door and a second tank extraction outlet in the solids collection
area
mounted adjacent the discharge door.

Preferably the or each tank extraction outlet includes a float valve
comprising a float ball contained in a cage which is free to be floated
upwardly by
liquid to engage a valve seat to prevent passage of liquid into the duct to
the vacuum

pump and the valve seat is located in a receptacle for the float ball located
above a
top wall of the tank so as to allow the tank to be filled substantially to the
top wall.
Preferably the cage for the float ball is formed from row of chains.

BRIEF DESCRIPTION OF THE DRAWINGS

One embodiment of the invention will now be described in conjunction
with the accompanying drawings in which:

Figure 1 is a side elevational view of a vacuum truck according to the
present invention.


CA 02653425 2012-06-18

8
Figure 2 is a cross sectional view longitudinally of the tank along the
lines 2-2 of Figure 1 showing the construction of the separation system within
the
tank.

Figure 3 is a ,cross sectional view transversely of the tank along the
lines 3-3 of Figure 1 showing the construction of the separation system within
the
tank and showing only a limited number of the chains for convenience of
illustration.

In the drawings like characters of reference indicate corresponding
parts in the different figures.

DETAILED DESCRIPTION

The vacuum truck of Figure 1 comprises a truck frame 10 mounted on
ground wheels 11 and 12 for movement across the ground for transporting the
vacuum system from place to place for effecting excavation or extraction of
materials
13 from a location to be removed. The materials commonly include a quantity of
solids and liquid. Typically the vacuum truck is used to clear a blockage in a
drain or

culvert and hence it is necessary to remove both solid material 13 and liquid,
generally water 13A, surrounding or mixed with the solids.

The frame of the truck including a cab 14 and drive systems is entirely
conventional and therefore will not be described in detail herein. The truck
carries a
vacuum pump 15 again of a conventional nature of the type which generates a
high

level of vacuum and high air throughput. Such pumps are well-known and are
conventionally available and include a discharge duct 16 for disposal.

The system further includes a material storage tank and separation


CA 02653425 2012-06-18

9
system generally indicated at 17 all of which are mounted as a common
structure on
rear hinges 18 adjacent the rear of the frame 10 so that the tank and
separation
system can be tilted about a horizontal axis defined by the hinges 18 by a
front lift
cylinder 19. Again the hinges and cylinder are of a conventional nature and
readily

available from various manufacturers. The lift cylinder can effect tilting of
the main
storage tank and separation system to a height sufficient to exceed the repose
angle
of the material stored within the tank so that it is readily discharged from
the tank
and from the filter system at the real of the tank and filter system.

The storage tank and separation system comprises a tank 20 which is
of circular cylindrical shape extending from a forward end 21 at the cylinder
19 to a
rearward end 22 at which is located a discharge door 23.

The vacuum system further includes an inlet hose 25 which has a rigid
front portion 24 mounted on a boom 27 for movement from place to place to
effect
lifting of the material 13. The hose 25 extends to an inlet opening 26 on the
top wall

of the tank 20 at a position generally mid-way along the length of the tank so
that air
carried along the hose 25 carries the material 13, 13A in suspension within
the
airflow until the air enters the storage tank 20 at the inlet opening 26 at
which time
the velocity in the air is dramatically decreased allowing the transported
material to
be discharged or dumped from the airflow and deposited in the base of the
storage

tank. In the embodiment shown the inlet merely discharges into the open tank
with
no cyclone or baffles so that the whole of the area underneath the inlet in
the top
wall is available for storage of the collected materials. However various
baffle


CA 02653425 2012-06-18

arrangements or cyclones may be used within the storage tank to effect
extraction of
as much as possible of the particles and moisture from the air.

The air is drawn out of the storage tank through two outlets 28, 28A at
an outlet opening 29, 29A. A duct 40 communicates the extracted air from the
5 outlets 28, 28A to the vacuum pump 15. The extraction of solids and liquid
from the

air by simply discharging into the tank at the inlet 26 is generally
sufficient to remove
enough materials from the air to allow the air to pass through the vacuum
pump.
Turning now to Figures 2 and 3, the tank 20 includes a separation

system therein generally indicated at 32 for separating the materials
generally into a
10 liquid component and a solids component. The separation system 32 includes
a
generally upstanding dividing wall 33 across the tank dividing a solids
collection area
34 on one side from a liquid collection area 35 on the other side. The solids
collection area 35 is located adjacent the discharge door 23 so that the
materials
therein can be dumped with the tank is tilted. The tank inlet 26 is located in
the

solids collection area approximately at a mid point therealong in the top wall
so that
the vacuumed material including the water and solids is dropped into the
solids
collection area. The liquid collection area is smaller and reduced to a
minimum so
as to maximize the storage volume defined by the solids collection area.

A liquid pump 37 is mounted in the tank with the pump having an inlet
located in the liquid collection area for extracting the liquid component from
the tank
to increase a storage capacity of the tank for the solids component to be
collected
and transported in the tank on the truck to a remote location for discharge.
In the


CA 02653425 2012-06-18

11
embodiment shown, the pump is a submersible pump located in the area 34 and
surrounded by a cage 36 to allow the extraction into the pump only of the
liquid
which is to be returned through an outlet pipe. However other types of pump
can be
used with the function of extracting the water from the area 34

The separation of the liquid or water from the solids is carried out
primarily by the dividing wall 33 which has a bottom wall portion 42, which is
substantially imperforate and has a top edge 43 at or adjacent a weir 45 over
which
liquid can flow into the liquid collection area. The bottom wall portion 42
has a
horizontal top edge and a semi-circular bottom edge matching the curvature of
the

tank so that the bottom wall portion substantially closes the tank below the
weir 45.
In the embodiment shown the top edge 43 is carried on a transverse rail 43A
which
provide structural strength. However the rail 43A may be omitted and the
portion 42
mounted on hinges at the sides with the top edge 43 defining the weir 45.

The dividing wall 33 has an upper screening section 46 above the weir,
which extends from the top edge to the top wall of the tank and is perforated
to allow
the liquid to pass over the weir 45 into the liquid collection area while
restricting
passage of the solids.

The upper screening section 46 includes a hanging curtain 47 covering
the whole of the upper part of the tank and formed by a series of side by side
lengths
of chain 48 which are connected to the tank only at a top end so that the
other end

of each length of chain is free and the length is suspended vertically with
the other
end of the lengths of chain in contact with or closely adjacent the top edge
43 of the


CA 02653425 2012-06-18

12
bottom wall portion or the rail. Only some of the chains are shown for
convenience.
The upper screening section further includes a perforated screen support or
mesh
49 on the side of the curtain which is within the liquid collection area to
prevent the
curtain from being forced into the liquid collection area by the weight of
collection of
solids within the solids collection area.

The bottom wall portion is pivotally mounted on the rail 48 for pivotal
movement about a horizontal axis at or adjacent the top edge 43. Thus the
bottom
wall portion will pivot to the right as shown in Figure 2 in response to the
tilting of the
tank. The bottom wall portion reaches substantially to the bottom wall of the
tank so

that when it opens the tank is open underneath the rail 48 such that
substantially all
material at the bottom wall can discharge when the tank is tilted.

A stop 49 is provided to butt the left side of the portion 42 at the bottom
to prevent pivotal movement of the bottom wall portion to the left that is in
a direction
into the liquid collection area caused by weight of solids collected in the
solids
collection area and pressing against the bottom wall portion.

The liquid pump 37 has its inlet mounted in the liquid collection area
below the top edge so that the water falling over the weir collects in that
area and is
pumped out from the tank to the discharge at a suitable pipe 50 from which it
can be
returned to the area being cleared of the blockage. In this way only, or
primarily, the
solids are collected and removed.

The tank extraction outlets 28 and 28A and the tank inlet 26 are all
mounted at the top of the tank so as to allow the tank to be filled
substantially to the


CA 02653425 2012-06-18

13
top. The first tank extraction outlet 28 is located at the front of the tank
in the liquid
collection area and the second tank extraction outlet 28A is located in the
solids
collection area. In this way the air continues to leave the tank even when the
tank is
filled at one end. In this way the diverging air from the inlet moving to the
two

extraction outlets acts to drop the materials from the air stream into the
tank acting
to load the solids collection area 35 relatively evenly thus maximizing the
amount of
material contained.

Each tank extraction outlet 28, 28A includes a float valve 52
comprising a float ball 53 contained in a cage 54 formed from row of chains
hanging
from the top of the tank. The ball is free to be floated upwardly by liquid in
the tank

when full to engage a valve seat 55 to prevent passage of liquid into the duct
to the
vacuum pump. The valve seat is located in a receptacle 56 for the float ball
53
located above the top wall of the tank and connected to the duct 28, 28A so as
to
allow the ball to float up above the top wall to the closed position thus
allowing the
tank to be filled substantially completely to the top wall.

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date 2013-01-29
(22) Filed 2008-12-15
(41) Open to Public Inspection 2010-06-15
Examination Requested 2010-08-18
(45) Issued 2013-01-29
Lapsed 2021-08-31

Abandonment History

There is no abandonment history.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Application Fee $200.00 2008-12-15
Request for Examination $400.00 2010-08-18
Maintenance Fee - Application - New Act 2 2010-12-15 $50.00 2010-11-30
Maintenance Fee - Application - New Act 3 2011-12-15 $50.00 2011-10-21
Final Fee $150.00 2012-10-17
Maintenance Fee - Application - New Act 4 2012-12-17 $50.00 2012-11-27
Maintenance Fee - Patent - New Act 5 2013-12-16 $100.00 2013-12-02
Maintenance Fee - Patent - New Act 6 2014-12-15 $100.00 2014-11-03
Maintenance Fee - Patent - New Act 7 2015-12-15 $100.00 2015-09-17
Maintenance Fee - Patent - New Act 8 2016-12-15 $100.00 2016-09-16
Maintenance Fee - Patent - New Act 9 2017-12-15 $100.00 2017-10-13
Maintenance Fee - Patent - New Act 10 2018-12-17 $125.00 2018-11-07
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
BAZIUK, SLAWKO MORRIS
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.
Documents

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Select Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Cover Page 2010-05-28 2 50
Abstract 2008-12-15 1 22
Description 2008-12-15 15 540
Claims 2008-12-15 6 198
Drawings 2008-12-15 3 62
Representative Drawing 2010-05-19 1 14
Abstract 2010-08-18 1 21
Claims 2010-08-18 8 241
Description 2010-08-18 13 483
Abstract 2012-06-18 1 21
Description 2012-06-18 13 480
Claims 2012-06-18 8 244
Drawings 2012-06-18 3 59
Representative Drawing 2013-01-11 1 16
Cover Page 2013-01-11 1 46
Correspondence 2009-03-09 1 61
Assignment 2008-12-15 4 130
Correspondence 2010-08-17 1 39
Prosecution-Amendment 2010-08-18 25 830
Correspondence 2010-09-01 1 95
Correspondence 2012-10-17 2 56
Prosecution-Amendment 2012-06-06 2 48
Prosecution-Amendment 2012-06-18 28 947