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Patent 2518572 Summary

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(12) Patent: (11) CA 2518572
(54) English Title: BEAVER CONTROL DEVICE FOR A CULVERT PIPE
(54) French Title: DISPOSITIF DE LUTTE CONTRE LES CASTORS POUR TUYAU A BUSE
Status: Granted
Bibliographic Data
Abstracts

English Abstract


A beaver control device for a culvert pipe features a generally conical
screen having a base portion and an apex portion connected by a plurality of
rods.
The base portion has a rim sized to fit about the end of the culvert pipe. The
apex
portion has a rim with an opening sized to selectively receive a weeping tile
or other
drainage pipe. The screen prevents beavers from damming the culvert while
allowing the drainage pipe to drain into or pass through the culvert. A pin is
provided
to either lock the drainage pipe in place or partially close off the opening
in the apex
portion when not in use. The screen is movable between raised and lowered
positions to allow easy access to the screen and culvert. In one embodiment,
the
screen is constructed as multiple pieces to allow for easy transport and on-
site
assembly.


French Abstract

Un dispositif de lutte contre les castors pour tuyau à buse présente un écran généralement conique ayant une partie de base et une partie de sommet reliées par une pluralité de tiges. La partie de base comporte un rebord dimensionné pour s'ajuster à l'extrémité du tuyau à buse. La partie de sommet comprend un rebord avec une ouverture dimensionnée pour recevoir sélectivement une tuile poreuse ou un autre tuyau de drainage. L'écran empêche les castors d'ériger un barrage sur la buse, tout en permettant de confiner le tuyau de drainage pour drainer ou passer à travers la buse. Une goupille de verrouillage est prévue pour soit verrouiller le tuyau de drainage en place, soit fermer partiellement l'ouverture dans la partie de sommet lorsqu'elle n'est pas en utilisation. L'écran est mobile entre des positions relevée et abaissée afin de permettre un accès facile à l'écran et à la buse. Dans un mode de réalisation, l'écran est construit sous forme de pièces multiples pour permettre un transport facile et un assemblage sur site.

Claims

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



17
CLAIMS:
1. A combination of a beaver control device, a culvert pipe and a
drainage pipe, said combination comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen,
said base portion comprising a first rim sized to receive the end of the
culvert pipe in
a first opening defined by the first rim;
an apex portion at the second end of the generally conical
screen, said apex portion comprising a second rim sized to selectively receive
the
drainage pipe in a second opening defined by the second rim; and
a plurality of spaced apart rods extending from the first end to
the second end and connecting the base and apex portions at spaced apart
positions about the first and second rims; and
a retaining mechanism cooperative with the generally conical screen
and operable to effect selective coupling thereof to the drainage pipe to
retain the
drainage pipe in position to drain into the culvert.
2. The combination according to claim 1 wherein the retaining
mechanism and the apex portion of the generally conical screen are arranged to

effect selective coupling of the drainage pipe and the generally conical
screen at the
apex portion thereof.


18
3. The combination according to any one of claims 1 to 2 wherein
the retaining mechanism comprises a pin passable through aligned holes in the
conical screen and the drainage pipe to effect coupling thereof.
4. The combination according to claim 3 wherein the aligned holes
comprise holes in the second rim at spaced positions thereabout to facilitate
passage of the pin through corresponding holes in the drainage pipe with the
drainage pipe received in the second opening.
5. The combination according to any one of claims 1 to 2 wherein
the retaining mechanism is operable to move into a closed position obstructing
the
second opening without the drainage pipe received therein.
6. The combination according to claim 5 wherein the retaining
mechanism comprises a pin passable through holes provided in the generally
conical screen at spaced positions thereabout at the apex portion to
selectively
obstruct the second opening without the drainage pipe received therein, or
secure
the drainage pipe to the generally conical screen by passing through the pin
corresponding holes in the drainage pipe with the drainage pipe received in
the
second opening.
7. The combination according to claim 6 wherein the holes are
provided in the second rim.
8. The combination according to any one of claims 1 to 7 wherein
the base portion comprises mounting elements arranged to connect the generally

conical screen to the end of the culvert pipe for motion between a closed
position in
which said screen substantially blocks the end of the culvert pipe and an open


19
position in which said screen does not substantially block at least a portion
of said
end of said culvert pipe.
9. The combination according to claim 8 wherein each mounting
element comprises a length of chain attached at opposite ends thereof to the
base
portion of the generally conical screen and the end of the culvert pipe to
facilitate
pivotal-like motion of the generally conical screen about the end of the
culvert pipe.
10. The combination according to any one of claims 8 to 9 wherein
the conical screen further comprises a coupler supported on the apex portion
to
facilitate connection of an actuator thereto to effect movement of the
generally
conical screen between the closed and open positions.
11. The combination according to any one of claims 8 to 9 further
comprising an actuator connected to the generally conical screen to effect
movement thereof between the closed and open positions.
12. The combination according to claim 11 wherein the actuator
comprises a longitudinal member attached to the apex portion and extending
toward
the base portion such that pulling said longitudinal member away from the apex

portion causes the generally conical screen to pivot about the end of the
culvert pipe
from the closed position to the open position.
13. The combination according to any one of claims 8 to 12 wherein
the mounting elements and the generally conical screen are arranged for
generally
pivotal motion of the generally conical screen to lift the apex portion upward
and
toward the end of the culvert pipe.



20
14. A beaver control device for a culvert pipe, the beaver control
device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen, said
base portion comprising a first rim sized to receive the end of the culvert
pipe in a
first opening defined by the first rim;
an apex portion at the second end of the generally conical screen, said
apex portion comprising a second rim that defines a second opening; and
a plurality of spaced apart rods extending from the first end to the
second end and connecting the base and apex portions at spaced apart positions

about the first and second rims; and
means for coupling a drainage pipe to the conical screen in a position
draining into the culvert through the second opening defined by the second
rim.
15. The beaver control device of claim 14 wherein the means for
coupling the drainage pipe is located at the second rim of the generally
conical
screen.
16. The beaver control device of claim 14 or 15 wherein the means
for coupling the drainage pipe comprises means for selectively receiving a pin
in a
closed position extending across the second opening of the generally conical
screen
via at least one hole in the drainage pipe.


21
17. The beaver control device of claim 16 wherein the means for
selectively receiving the pin comprises aligned holes in the second rim of the

generally conical screen.
18. A beaver control device for a culvert pipe, the beaver control
device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen, said
base portion comprising a first rim sized to receive the end of the culvert
pipe in a
first opening defined by the first rim;
an apex portion at the second end of the generally conical screen, said
apex portion comprising a second rim that defines a second opening; and
a plurality of spaced apart rods extending from the first end to the
second end and connecting the base and apex portions at spaced apart positions

about the first and second rims; and
means for selectively receiving a pin in a closed position extending across
the
second opening defined by the second rim.
19. The beaver control device of claim 18 wherein the means for
selectively receiving the pin comprises aligned holes in the second rim of the

generally conical screen.
20. A beaver control device for a culvert pipe, the beaver control
device comprising:


22
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen, said
base portion comprising a first rim sized to receive the end of the culvert
pipe in a
first opening defined by the first rim;
an apex portion at the second end of the generally conical screen, said
apex portion comprising a second rim that defines a second opening; and
a plurality of spaced apart rods extending from the first end to the
second end and connecting the base and apex portions at spaced apart positions

about the first and second rims; and
aligned holes in the second rim for selective receipt of a pin in a closed
position extending across the second opening defined by the second rim.
21. The beaver control device of any one of claims 16 to 20 in
combination with the pin, which is movable between the closed position and an
open
position in which the second opening is unobstructed by said pin.
22. A beaver control device for use with a culvert pipe and a
drainage pipe, the beaver control device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen,
said base portion comprising a first rim sized to receive the end of the
culvert pipe in
a first opening defined by the first rim;


23
an apex portion at the second end of the generally conical
screen, said apex portion comprising a second rim sized to selectively receive
the
drainage pipe in a second opening defined by the second rim; and
a plurality of spaced apart rods extending from the first end to
the second end and connecting the base and apex portions at spaced apart
positions about the first and second rims; and
a retaining mechanism cooperative with the generally conical screen
and operable to effect selective coupling thereof to the drainage pipe to
retain the
drainage pipe in position to drain into the culvert.
23. The beaver control device according to claim 22 wherein the
retaining mechanism and the apex portion of the generally conical screen are
arranged to effect selective coupling of the drainage pipe and the generally
conical
screen at the apex portion thereof.
24. The beaver control device according to claim 22 or 23 wherein
the retaining mechanism comprises aligned holes in the second rim of the
generally
conical screen and a pin passable through said aligned holes.
25. The beaver control device according to any one of claims 22 to
24 wherein the retaining mechanism is operable to move into a closed position
obstructing the second opening without the drainage pipe received therein.
26. The beaver control device according to claim 22 or 23 wherein
the retaining mechanism comprises a pin passable through holes provided in the

second rim of the generally conical screen to selectively obstruct the second
opening without the drainage pipe received therein, or secure the drainage
pipe to

24
the generally conical screen by passing through the pin through corresponding
holes
in the drainage pipe with the drainage pipe received in the second opening.

Description

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


CA 02518572 2013-12-16
1
BEAVER CONTROL DEVICE FOR A CULVERT PIPE
This invention relates generally to a cone-shaped screen for
attachment to an end of a culvert pipe for preventing beavers from building a
dam to
block the flow of water. More particularly, the present invention relates to a
cone-
shaped screen having an apex portion for selective connection to a drainage
pipe
arranged to drain into or pass through the culvert pipe.
BACKGROUND OF THE INVENTION
Culvert pipes are widely used to allow water to flow beneath roads
without having to redirect it or construct a bridge to pass over the stream.
Unfortunately, such pipes represent an ideal place for beavers to construct a
dam
and restrict the flow of water. These dams can quickly cause flooding and
washouts
when water levels are elevated, for example, by heavy rains or melting snow.
Vertical screens or grates have been used to prevent beavers from entering
culverts,
but such devices do not discourage beavers from building dams at the ends of a
culvert pipe. Also, water flows tend to deposit debris at such barriers which
builds
up over time and restricts flow through the culvert.
US Patent Numbers 5,102,537 and 6,447,206 disclose cone-shaped
screens that were intended to overcome the limitations of the flat designs
discussed
above. A base end of the screen attached to the end of the culvert has a
series of
rods extending outward from the culvert to an apex end. The rods are spaced by
a
distance that allows small debris to pass through without clogging the culvert
while
preventing entry by beavers and similarly sized animals. The beavers cannot

CA 02518572 2013-12-16
2
construct an ideal dam at the opening of the culvert as they cannot properly
anchor
the structure.
As a result of limiting access to the culvert by beavers, the prior art
also limits access to the culvert pipe by others. For example, it may be
useful to
connect other drainage systems, such as weeping tile, to existing culvert
pipes. The
combination of such systems is often ideal as it eliminates the need for
separate
piping systems and thus reduces cost and environmental interference. In
addition,
large culverts require correspondingly large screens that are difficult and
costly to
transport due to their dimensions. As a result, there is a desire for a beaver
control
device that is easy to transport and prevents dam construction and debris
buildup at
the end of a culvert pipe while allowing the connection of other drainage
sources to
the culvert.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a beaver
control device for installation on an end of a culvert pipe and selective
coupling with
a drainage pipe, said device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion for connection to the end of the culvert pipe at
the first end of the generally conical screen;
an apex portion for selective coupling with the drainage pipe at
the second end of the generally conical screen;

CA 02518572 2013-12-16
3
a plurality of spaced apart rods extending from the first end to
the second end and connecting the base and apex portions; and
a retaining member for maintaining selective coupling between
said apex portion and the drainage pipe
The present invention overcomes the shortcomings of the prior art by
providing an apex portion that is arranged to selectively couple with a
drainage pipe
such as those found in a weeping tile drainage system. A retaining member is
provided to ensure that the drainage pipe is held in place when connected to
the
beaver control device so that animals cannot dislodge the drainage pipe from
the
desired position in which it drains into the culvert pipe. The rods extending
between
the base and apex portions prevent beavers from approaching the end of the
culvert
pipe while allowing small debris to flow through the openings between them.
Preferably the apex portion comprises a rim having an opening therein
for selectively receiving the drainage pipe and the retaining member is
supported on
the apex portion.
Preferably the retaining member comprises a pin movable between an
open position and a closed position. The pin extends across the opening of the

apex portion in the closed position, thereby blocking a portion of said
opening, and
does not extend across said opening in the open position, thereby leaving said
opening substantially unobstructed. The pin is arranged to pass through at
least one
hole in the drainage pipe during movement from the open position to the closed

position if said drainage pipe has been received in said opening, thereby
securing
said drainage pipe to the apex portion. So when a drainage pipe is not
connected to

CA 02518572 2013-12-16
4
the apex end of the device, the pin is placed in the closed position to block
off the
opening to prevent beavers from entering the screen. When a drainage pipe is
connected, the pin is used to lock the pipe in place so that the beavers
cannot knock
it free from the screen.
Preferably the base portion comprises a rim having an opening therein
for receiving the end of the culvert pipe and mounting elements for connecting
said
base portion and the end of the culvert pipe.
Preferably the mounting elements allow motion of said beaver control
device between a lowered position in which said beaver control device
substantially
blocks the end of the culvert pipe and a raised position in which said beaver
control
device does not substantially block at least a portion of said end of said
culvert pipe.
The raised position allows for easier cleaning of the device to remove any
build up of
debris.
Preferably each mounting element comprises a length of chain
attached at opposite ends thereof to the base portion of the beaver control
device
and the end of the culvert pipe.
Preferably there is provided a coupler for connecting an actuator to the
conical screen for moving the beaver control device between the lowered and
raised
positions. Preferably the coupler is supported on the apex portion.
There may be provided an actuator for moving the beaver control
device between the lowered and raised positions. In this case, preferably the
actuator comprises a flexible longitudinal member attached to the apex portion
and
extending toward the base portion such that pulling said longitudinal member
away

CA 02518572 2013-12-16
from the apex portion causes the beaver control device to pivot about the end
of the
culvert pipe from the lowered position to the raised position. The use of such
a
flexible longitudinal member, like a rope or chain, allows the device to be
easily
raised and lowered for occasional cleaning.
5 The base
and apex portions may comprise a plurality of base members
and apex members respectively, each base member being connected to a
respective apex member by respective ones of the plurality of rods. In this
case,
preferably the adjacent base members are coupled together and adjacent apex
members are also coupled together. Preferably the adjacent members are
detachably coupled by bolts at flanges provided at opposite ends of each
member.
This allows the device to be partially assembled on-site from multiple pieces
which
can be transported with less hassle and lower costs.
According to a second aspect of the invention there is provided a
beaver control device for installation on an end of a culvert pipe, said
device
comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion for connection to the end of the culvert pipe at
the first end of the generally conical screen;
an apex portion at the second end of the generally conical
screen; and
a plurality of spaced apart rods extending from the first end to
the second end and connecting the base and apex portions;

CA 02518572 2013-12-16
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the base and apex portions comprising a plurality of base members
and apex members respectively, each base member being connected to a
respective apex member by respective ones of the plurality of rods;
adjacent base members being coupled together such that the base
members collectively define a base rim having an opening therein; and
adjacent apex members being coupled together.
Preferably the opening in the base rim is shaped to receive the end of
the culvert pipe such that said base rim is disposed about said culvert pipe
and the
opening in the apex rim is shaped to selectively receive a drainage pipe such
that
said apex rim is disposed about said drainage pipe.
Preferably the adjacent members are coupled together by bolts at
flanges provided at opposite ends of each member.
According to a third aspect of the invention there is provided a beaver
control device for a culvert pipe, the beaver control device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen, said
base portion comprising a first rim sized to receive the end of the culvert
pipe in a
first opening defined by the first rim;
an apex portion at the second end of the generally conical screen, said
apex portion comprising a second rim sized to selectively receive the drainage
pipe
in a second opening defined by the second rim; and

CA 02518572 2013-12-16
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a plurality of spaced apart rods extending from the first end to the
second end and connecting the base and apex portions at spaced apart positions

about the first and second rims; and
means for coupling a drainage pipe to the conical screen in a position
draining into the culvert.
In one embodiment, the means for coupling the drainage pipe
comprises aligned holes in the second rim of the generally conical screen for
selectively receiving a pin in a closed position extending across the second
opening
of the generally conical screen via at least one hole in the drainage pipe.
According to a fourth aspect of the invention there is provided a beaver
control device for a culvert pipe, the beaver control device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen, said
base portion comprising a first rim sized to receive the end of the culvert
pipe in a
first opening defined by the first rim;
an apex portion at the second end of the generally conical screen, said
apex portion comprising a second rim sized to selectively receive the drainage
pipe
in a second opening defined by the second rim; and
a plurality of spaced apart rods extending from the first end to the
second end and connecting the base and apex portions at spaced apart positions

about the first and second rims; and

CA 02518572 2013-12-16
8
means for selectively receiving a pin in a closed position extending across
the
second opening defined by the second rim.
According to a fifth aspect of the invention there is provided a beaver
control device for a culvert pipe, the beaver control device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:
a base portion at the first end of the generally conical screen, said
base portion comprising a first rim sized to receive the end of the culvert
pipe in a
first opening defined by the first rim;
an apex portion at the second end of the generally conical screen, said
apex portion comprising a second rim sized to selectively receive the drainage
pipe
in a second opening defined by the second rim; and
a plurality of spaced apart rods extending from the first end to the
second end and connecting the base and apex portions at spaced apart positions
about the first and second rims; and
aligned holes in the second rim for selective receipt of a pin in a closed
position extending across the second opening defined by the second rim.
According to a sixth aspect of the invention there is provided a beaver
control device for use with a culvert pipe and a drainage pipe, the beaver
control
device comprising:
a generally conical screen having opposite first and second ends, said
generally conical screen comprising:

CA 02518572 2013-12-16
9
a base portion at the first end of the generally conical screen,
said base portion comprising a first rim sized to receive the end of the
culvert pipe in
a first opening defined by the first rim;
an apex portion at the second end of the generally conical
screen, said apex portion comprising a second rim sized to selectively receive
the
drainage pipe in a second opening defined by the second rim; and
a plurality of spaced apart rods extending from the first end to
the second end and connecting the base and apex portions at spaced apart
positions about the first and second rims; and
a retaining mechanism cooperative with the generally conical screen
and operable to effect selective coupling thereof to the drainage pipe to
retain the
drainage pipe in position to drain into the culvert.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate exemplary
embodiments of the present invention:
Figure 1 is a top plan view of a beaver control device according to a
first embodiment of the present invention installed between a culvert pipe and
a
weeping tile pipe.
Figure 2 is a top plan view of a beaver control device according to a
second embodiment of the present invention installed between the culvert and
the
weeping tile pipe.
Figure 3 is a cross sectional view of the beaver control device and
weeping tile pipe of Figure 2 as taken from line 3-3.

CA 02518572 2013-12-16
Figure 4 is a side view of the beaver control device of Figure 2 in a
closed position on the culvert pipe with a rope used for moving the beaver
control
device relative to the culvert pipe.
Figure 5 is a side view of the beaver control device of Figure 3 with the
5 rope
having been sufficiently pulled to move the beaver control device into an open
position on the culvert.
Figure 6 is an end view of the beaver control device of Figure 2 before
assembly of its two halves.
DETAILED DESCRIPTION OF THE DEVICE
10 Figures
1 and 2 show overhead views of different embodiments of a
beaver control device 1 called the "Beavercone" as installed in cooperation
with a
weeping tile pipe 20 and a culvert pipe 10. As can be seen, the weeping tile
pipe 20
is arranged to drain into the culvert pipe 10 and so the beaver control device
1 must
accommodate this arrangement. The device 1 is a generally conical screen 30
made up of a base portion 34 connected to the culvert pipe 10, an apex portion
44
connected to the weeping tile pipe 20 and a plurality of rods 42 extending
between
the two portions at the opposite ends. The rods are arranged to prevent
beavers
from entering the screen 30 and building a dam at the entrance to the culvert
10.
The conical shape also prevents the build up of debris at the entrance of the
culvert
10 associated with the installation of flat screens or grills. The present
invention can
be used on a culvert pipe 10 regardless of whether weeping tile 20 is in place
or not.
Figure 1 illustrates a first embodiment of the device 1 which is
constructed to form a single structure that is installed without further
assembly. The

CA 02518572 2013-12-16
11
base portion 32 has a circular rim 34 which is dimensioned to fit over the end
of the
culvert pipe 10 such that the opening of the pipe 10 is not blocked in any way
by the
base portion 32. The base portion 32 is further connected to the culvert pipe
10 by
means of two lengths of chain 38 spaced apart near the top of the device 1 and
culvert 10. The chains 38 are attached to the base portion 32 by bolts 36
secured
through the rim 32. Similarly, the chains 38 are attached to the culvert pipe
10 by
means of bolts 40. The chains 38 ensure that the screen 30 remains secured to
the
culvert 10, but do allow limited motion of the device 1 with respect to the
culvert, the
purpose of which will be explained below. Similar to the base portion 32, the
apex
portion 44 has a circular rim 46 which is dimensioned to fit over the end of
the
weeping tile pipe 20 such that the pipe 20 is received within an opening 56
defined
by the rim 46.
Supported on the rim 46 of the apex portion 44 is a coupler in the form
of a vertically extending hook 48, the purpose of which will be explained in
conjunction with the limited motion allowed by the chains 38 below. The screen
30
also includes a retaining member in the form of a pin 50 which passes through
aligned holes 51 in the apex rim 46. The purpose of the pin 50 is twofold.
Firstly,
the pin 50 serves to lock the weeping tile pipe 20 in place as shown in Figure
1.
Aligned holes 21 are provided in the weeping tile pipe 20 corresponding to the
aligned holes 51 in the apex rim 46 such that the pin 50 can be passed through
both
objects. So not only is the weeping tile 20 received and positioned by the rim
46, but
it is further retained by engagement with the pin 50. This would prove useful
in an
arrangement where the weeping tile 20 passes through the opening defined by
the

CA 02518572 2013-12-16
12
apex rim 46 but does not extend all the way to the culvert 10 as shown in the
figure.
In such a case, small relative movement of the weeping tile 20 and screen 30
could
result in separation of the two, but such movement is prevented by the pin 50.

Secondly, the pin 50 serves to partially block off the opening 56 defined by
the rim
46 which is important for the case where weeping tile is not coupled to the
screen
30. Without weeping tile 20 received in the opening 56 of the apex portion 44,

beavers could enter the screen 30 to gain access to the culvert pipe 10 by
means of
the opening. By dividing the opening 56 into two smaller openings, the pin 50
closes
off this access route. As a result, the invention can be used to successfully
prevent
the construction of beaver dams at culvert entrances or exits regardless of
the
presence or lack of weeping tile or similar drainage piping.
Figure 2 illustrates a second embodiment of the beaver control device
1 in which the screen 30 is made of two pieces which can be assembled on-site.

This proves useful for larger applications requiring screens of significant
dimensions
that may be difficult and/or costly to transport. While having the same
general
structure as the embodiment of Figure 1, the difference lies in the rims 34
and 46 of
the base portion 32 and apex portion 44 respectively. Here the rims are each
made
of two semi-circular portions that are detachably coupled together by bolts 54
at
flanges 52. Figure 3 shows a cross section taken along line 3-3 of Figure 2
near
the apex portion 44 which illustrates the two piece construction more clearly.
The
apex rim 46 is made up of two semicircular apex members 45 and 47. A flange 52
is
provided at each end of each member so that when the flanges 52 of members 45
and 47 are aligned, they fit together in a flush manner. The flanges 52 are

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13
connected by a bolt 54 and the apex members 45 and 47 collectively form the
circular rim 46 having a circular opening 56. The construction of the rim 34
of the
base portion 32 is the same, except on a larger scale. As shown in Figure 6,
the
base rim 34 is made up of two semicircular base members 33 and 35,
corresponding
to apex members 45 and 47 respectively. The top apex and base members 45 and
33 are connected by respective upper rods 41 and the bottom apex and base
members 47 and 35 are connected by respective lower rods 43. The result is
that
the conical screen 30 is made up of two halves 60 and 62 which are coupled
together at the base and apex portions 32 and 44 by means of flanges 52 and
bolts
54. So the two halves 60 and 62 of the screen 30 can be transported separately
or
nested one within the other during transport in which space is limited. These
two
haves 60 and 62 can then be assembled on-site during installation on the
culvert
pipe 10. If it becomes desirable to move the screen 30 to another location,
the bolts
54 can be removed to disassemble the screen 30 for transport to the new
location.
Figure 3 further illustrates the weeping tile 20 as being received in the
opening 56 of the rim 46 of the apex portion 44. Diametrically opposite holes
51 (in
other words, holes aligned through the center of the rim 46) are provided such
that
the pin 50 can be passed through the rim 46. A similar pair of diametrically
opposite
holes 21 are made in the weeping tile pipe 20 so that should it be desirable
to
receive the weeping tile 20 in the opening 56, the radially and longitudinally
aligned
holes allow the pin 50 to be passed through both the rim 46 and the weeping
tile
pipe 20 in order to lock them in a coupled relationship. As shown in the
figure, the
rods 42 of the screen 30 are welded to the radially outermost surface 49 of
the rim

CA 02518572 2013-12-16
14
46, opposite the opening 56. Mounting the rods 42 on this outside surface 49
ensures that they do not interfere with the insertion of the weeping tile pipe
20 into
the opening 56 of the rim 46. Similarly, the rods 42 are welded to the
radially
outermost surface 62 of the of the rim 34 of the base portion 32 to ensure
that they
do not interfere with the installation of the base rim 34 about the end of the
culvert.
Figure 4 is a side view of the screen 30 installed on a culvert pipe 10
without weeping tile 20. Should debris build up somewhere on or near the
screen
30, it may prove difficult to clear in the lowered position shown, as a
significant
portion of the screen 30 may be submerged in water. As a result, it is
desirable to
mount the screen 30 on the culvert 10 in such a way that it is movable between
the
lowered position of Figure 4 and the raised position of Figure 5. The hook 48
provided on the rim 46 of the apex portion 44 and the chains 38 connecting the
base
portion 32 and the culvert 10 work together to provide this motion. A rope 58
tied to
the hook 48 is pulled in the direction indicated by the arrow in order to
pivot the
screen 30 upward about the end of the culvert 10, raising the apex portion 44.
In
this position, the screen 30 and culvert 10 will be easier to clean. It should
be
appreciated that because the screen 30 is not mounted on a transverse shaft,
but
rather attached to the culvert 10 by means of the chains 38, the motion will
not be
purely pivotal as the chains do allow limited translational motion as well.
The result
is the transition of the screen 30 between the lowered position generally
aligned with
the length of the culvert pipe 10 and the raise position inclined with respect
to the
pipe 10. When weeping tile 20 is coupled with the screen 30, the tile and
screen
should be separated before raising the screen.

CA 02518572 2013-12-16
In the one piece construction of the first embodiment, the rims 34 and
46 of the base portion 32 and apex portion 44 are flat bars of generally
circular
shape. In the two piece construction, flat bars are again used for the base
and apex
members but are semicircular in shape. The flanges 52 are created by welding
5 angle iron across the bars to create a radially outward extending piece
along the
width of the rim. It should be appreciated that these components can be made
using
alternate materials and processes known to those of skill in the art to obtain
the
same effect.
Similarly, means of mounting the screen 30 on the culvert 10 for the
10 relative motion between the lowered and raised positions described above
other
than the combination of chains 38 and bolts 36 and 40 are known to those of
skill in
the art. For example, the chains 38 could be wrapped around the rim 34 and
reattached to themselves instead of being bolted, or a hinge mechanism could
be
provided in place of the chains 38. Also, the rope 58 used as an actuator for
15 movement of the screen 30 could be replaced by any number of suitable
actuators
known to those of skill in the art. Another example of a manually operated,
flexible
longitudinal member would be a chain. Another alternative is to mechanize the
lifting process with a lifting apparatus, for example, using cylinders.
While the above embodiments have been described for use on a
culvert pipe 10 in order to allow the possibility of running weeping tile pipe
20
through the screen 30 for draining into the culvert 10, it should be
appreciated that
pipes other than those used in weeping tile systems can be received in the
opening
56 of the rim 46 of the apex portion 44. The device 1 can be easily modified
to

CA 02518572 2013-12-16
16
accept various tubes, pipes or conduits that drain into or pass through a
culvert 10
having a screen 30. Furthermore, the shape of the screen 30 does not have to
be a
perfect conical portion and can be somewhat varied while still retaining the
desired
effect of narrowing from a larger end at the base to a smaller end at the
apex. In
cases where the culvert 10 is damaged and cannot properly support the device
1, a
screen 30 with a base rim 34 having a diameter less than that of the culvert
10 may
be installed by mounting the base portion 32 within the end of the culvert 10.
Finally,
while the second embodiment has the screen 30 divided into two separate halves
60
and 62 that are held together by bolts 54, it is also possible to further
divide the
screen 30 into additional pieces, such as quarters, to facilitate transport of
very large
beaver control devices. In addition, the pieces can be attached by means other
than
bolts, including more permanent fastening methods. While detachably coupling
the
pieces with bolts allows for easy removal, disassembly and transport at a
later date,
welding or other methods known to those of skill in the art can be used to
permanently attached the pieces of the screen should it be desirable to do so.
Since various modifications can be made in my invention as herein
above described, and many apparently widely different embodiments of same made

within the spirit and scope of the claims without departure from such spirit
and
scope, it is intended that all matter contained in the accompanying
specification shall
be interpreted as illustrative only and not in a limiting sense.

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 2009-12-15
(22) Filed 2005-09-08
Examination Requested 2006-06-22
(41) Open to Public Inspection 2007-03-08
(45) Issued 2009-12-15
Reissued 2014-08-12

Abandonment History

Abandonment Date Reason Reinstatement Date
2009-09-08 FAILURE TO PAY APPLICATION MAINTENANCE FEE 2009-09-21

Maintenance Fee

Last Payment of $236.83 was received on 2023-09-06


 Upcoming maintenance fee amounts

Description Date Amount
Next Payment if standard fee 2024-09-09 $624.00
Next Payment if small entity fee 2024-09-09 $253.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

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Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Application Fee $200.00 2005-09-08
Request for Examination $400.00 2006-06-22
Maintenance Fee - Application - New Act 2 2007-09-10 $50.00 2007-08-24
Maintenance Fee - Application - New Act 3 2008-09-08 $50.00 2008-08-12
Final Fee $150.00 2009-08-24
Reinstatement: Failure to Pay Application Maintenance Fees $200.00 2009-09-21
Maintenance Fee - Application - New Act 4 2009-09-08 $50.00 2009-09-21
Maintenance Fee - Patent - New Act 5 2010-09-08 $300.00 2010-09-27
Maintenance Fee - Patent - New Act 6 2011-09-08 $100.00 2011-07-22
Maintenance Fee - Patent - New Act 7 2012-09-10 $100.00 2012-08-31
Maintenance Fee - Patent - New Act 8 2013-09-09 $100.00 2013-08-28
Reissue a patent $1,600.00 2013-12-16
Maintenance Fee - Patent - New Act 9 2014-09-08 $300.00 2014-09-12
Maintenance Fee - Patent - New Act 10 2015-09-08 $125.00 2015-07-02
Maintenance Fee - Patent - New Act 11 2016-09-08 $125.00 2016-06-07
Maintenance Fee - Patent - New Act 12 2017-09-08 $125.00 2017-08-03
Maintenance Fee - Patent - New Act 13 2018-09-10 $125.00 2018-08-14
Maintenance Fee - Patent - New Act 14 2019-09-09 $125.00 2019-08-20
Maintenance Fee - Patent - New Act 15 2020-09-08 $225.00 2020-08-14
Maintenance Fee - Patent - New Act 16 2021-09-08 $229.50 2021-08-27
Maintenance Fee - Patent - New Act 17 2022-09-08 $229.04 2022-08-31
Maintenance Fee - Patent - New Act 18 2023-09-08 $236.83 2023-09-06
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
FLEMING, WALTER
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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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Abstract 2005-09-08 1 20
Description 2005-09-08 13 431
Drawings 2005-09-08 6 98
Claims 2005-11-01 5 172
Representative Drawing 2007-02-15 1 7
Cover Page 2007-02-28 1 37
Description 2008-11-25 13 535
Claims 2008-11-25 3 110
Representative Drawing 2009-11-23 1 8
Cover Page 2009-11-23 1 37
Description 2013-12-16 16 598
Claims 2013-12-16 8 237
Abstract 2013-12-16 1 20
Drawings 2013-12-16 6 98
Representative Drawing 2014-07-15 1 8
Cover Page 2014-07-15 1 38
Correspondence 2005-10-19 1 13
Assignment 2005-09-08 2 79
Correspondence 2007-07-19 2 41
Correspondence 2005-11-01 6 205
Prosecution-Amendment 2006-06-22 2 43
Prosecution-Amendment 2008-06-16 3 90
Prosecution-Amendment 2008-11-25 20 828
Correspondence 2009-08-24 2 72
Fees 2009-09-21 2 55
Fees 2010-09-27 2 53
Prosecution-Amendment 2014-04-25 3 141
Correspondence 2014-08-12 1 23
Prosecution-Amendment 2013-12-16 29 1,059
Correspondence 2014-01-07 1 10
Correspondence 2014-06-10 1 3
Correspondence 2014-06-25 1 32