U.S. patent application number 11/701249 was filed with the patent office on 2008-05-01 for pool safety system.
Invention is credited to George S. Pellington, Paul E. Pennington, Shane Stevens.
Application Number | 20080098507 11/701249 |
Document ID | / |
Family ID | 39328844 |
Filed Date | 2008-05-01 |
United States Patent
Application |
20080098507 |
Kind Code |
A1 |
Pellington; George S. ; et
al. |
May 1, 2008 |
Pool safety system
Abstract
The present invention provides a swimming pool safety system
including a housing having a first opening for coupling to a pump,
a second opening for coupling to a pool drain, and a third opening
for receiving water form a surface of a pool. The present invention
may include a skimmer basket positionable in the housing, where the
skimmer basket defines a debris-retaining region and a member
having a passage therethrough. A method of use of the present
invention is also provided in which the housing may be configured
to reduce an entrapment force experienced at a pool drain, and to
further provide a fluid flow path through the debris-retaining
region of the skimmer basket to place the first opening of the
housing in fluid communication with the surrounding atmosphere. A
collector vessel may also be included, the collector vessel having
an adjustable extension element to modify a resulting entrapment
force.
Inventors: |
Pellington; George S.; (Vero
Beach, FL) ; Pennington; Paul E.; (Santa Rosa,
CA) ; Stevens; Shane; (Land-O-Lakes, FL) |
Correspondence
Address: |
CHRISTOPHER & WEISBERG, P.A.
200 EAST LAS OLAS BOULEVARD, SUITE 2040
FORT LAUDERDALE
FL
33301
US
|
Family ID: |
39328844 |
Appl. No.: |
11/701249 |
Filed: |
February 1, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
11588909 |
Oct 27, 2006 |
|
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|
11701249 |
|
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Current U.S.
Class: |
4/507 |
Current CPC
Class: |
E04H 4/1272
20130101 |
Class at
Publication: |
4/507 |
International
Class: |
E04H 4/00 20060101
E04H004/00 |
Claims
1. A collector vessel for use with a swimming pool, comprising: a
housing defining a port for coupling to a pool drain, wherein a
vertical positioning of the port is selectively adjustable.
2. The collector vessel according to claim 1, wherein the port is
defined by an extension element positionable within the
housing.
3. The collector vessel according to claim 2, wherein the housing
defines a first opening for coupling to a pool drain, and wherein
the extension element is coupled to the first opening such that the
port is vertically offset from the first opening.
4. The collector vessel according to claim 3, wherein the extension
element is movable about the housing.
5. A collector vessel for use with a swimming pool, comprising: a
housing defining a first opening for coupling to a pool drain and a
second opening for coupling to a pump; and an extension element
defining a first extension opening, a second extension opening, and
a passage therebetween, wherein the first extension opening is
coupled to the first opening of the housing, and wherein the second
extension opening is vertically offset from the first extension
opening.
6. The collector vessel according to claim 5, further comprising a
third opening.
7. The collector vessel according to claim 6, wherein the first
opening is located a first distance from the third opening, the
second extension opening is located a second distance from the
third opening, and wherein the first distance is greater than the
second distance.
8. The collector vessel according to claim 6, wherein the first
opening is located a first distance from the third opening, the
second extension opening is located a second distance from the
third opening, and wherein the first distance is less than the
second distance.
9. The collector vessel according to claim 6, wherein the second
extension opening is located a vertical distance of between
approximately 5 inches and approximately 20 inches from the third
opening.
10. The collector vessel according to claim 5, wherein the
extension element is movable about the first opening.
11. A swimming pool system, comprising: a housing having a fluid
therein defining a fluid surface, the housing further defining a
port coupled to a pool drain, wherein a vertical distance between
the port and the fluid surface is selectively adjustable.
12. The swimming pool system according to claim 11, wherein the
port is defined by an extension element positionable within the
housing.
13. The swimming pool system according to claim 12, wherein the
housing defines a first opening for coupling to a pool drain, and
wherein the extension element is coupled to the first opening such
that the port is vertically offset from the first opening.
14. The swimming pool system according to claim 12, wherein the
extension element is movable about the housing.
15. A swimming pool system, comprising: a housing having a fluid
therein defining a fluid surface, the housing further defining a
first opening in fluid communication with a pool drain and a second
opening in fluid communication with a pump; and an extension
element defining a first extension opening, a second extension
opening, and a passage therebetween, wherein the first extension
opening is in fluid communication with the first opening of the
housing, and wherein the second extension opening is vertically
offset from the first extension opening.
16. The swimming pool system according to claim 15, wherein the
first opening is located a first distance from the fluid surface,
the second extension opening is located a second distance from the
fluid surface, and wherein the first distance is greater than the
second distance.
17. The swimming pool system according to claim 15, wherein the
first opening is located a first distance from the fluid surface,
the second extension opening is located a second distance from the
fluid surface, and wherein the first distance is less than the
second distance.
18. The swimming pool system according to claim 15, wherein the
second extension opening is located a vertical distance of between
approximately 5 inches and approximately 20 inches from the fluid
surface.
19. A swimming pool system, comprising: a first conduit defining a
first opening and a second opening, the first and second openings
located on a submerged surface of a swimming pool; a second conduit
coupled to the first conduit at a junction, wherein the second
conduit is in fluid communication with a pump; and a third conduit
coupled to the first conduit substantially proximate to the
junction, wherein the third conduit is in fluid communication with
atmosphere.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation-in-part-of U.S. Utility
patent application Ser. No. 11/588,909 filed Oct. 27, 2006 entitled
POOL SKIMMER SAFETY SYSTEM, the entirety of which is incorporated
herein by reference.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] n/a
FIELD OF THE INVENTION
[0003] The present invention relates to a method and system for
limiting and/or reducing an entrapment force in pool drains in
order to avoid injury.
BACKGROUND OF THE INVENTION
[0004] In general, swimming pools include a pump for drawing water
from a drain at the bottom of a pool through a skimmer housing and
towards a filter from which the water is returned to the pool. The
skimmer housing is often installed at least partially in the ground
or beneath a deck surface, having a removable lid and a basket
contained therein that retains leaves or other debris from the pool
and prevents clogging of the pump and/or filter.
[0005] In order to provide sufficient circulation of pool water
such that the filter and other components of the pool operate as
desired, the pool pump providing the circulation often has a fairly
large flow rate. As water is drawn through the drain by the pump, a
suction force is created at the surface of the drain, and as such,
the drain at the bottom of a swimming pool can pose a significant
safety hazard to those occupying of the pool, in particular to a
young child or a person of limited physical strength. In the event
someone in the pool inadvertently covers the drain with a part of
his/her body, the suction force will tend to retain the user
against the drain unless the user has sufficient strength to push
away from the drain. In fact, in most cases, the suction force is
so substantial, i.e., in the range of 500 pounds of force or more,
that even an adult of above-average strength will be unable to
overcome the suction force being experienced. As a result, there is
a strong likelihood that a person will panic, increasing the chance
that drowning may result. Even under circumstances where an
individual is capable of pushing away from the drain, the
possibility of incurring serious injury remains nonetheless.
[0006] To overcome the potential for injury or drowning due to the
suction force and thus the chance of being drawn against and
retained by a swimming pool drain, numerous devices have been
developed over the years to reduce and/or eliminate the suction
force created during a blockage or entrapment. Some of these
devices introduce air to the inlet side of the pump in response to
the sensed high suction condition, which results in loss of pump
prime. Other devices may interrupt the power source to the pump,
thereby causing the pump to cease operation. There are also devices
which provide for a conduit to open to the atmosphere upon sensing
a predetermined level of suction, which allows air to enter the
system and thereby break the vacuum or suction force at the
drain.
[0007] While certain devices have been proposed, there are numerous
problems present with existing devices. For example, many of the
devices are very expensive and have multiple moving parts, which
increases the likelihood that the device may malfunction or fail to
operate as intended. In addition, some of the devices provide false
signals triggered by filled drain sumps and/or skimmer baskets, or
due to pressure variations created when the pump is first turned
on. Moreover, installation of some devices may require excavation
or other drastic measures for installation, which greatly increases
cost and provides a deterrent to use and integration. Finally, upon
installing a particular device, the pump might be damaged or
otherwise negatively impacted upon actuation of the device,
resulting in the attendant problems of expense and loss of use of
the swimming pool.
[0008] In view of the above-described problems and limitations, it
would be desirable to provide a safety system for reducing and/or
eliminating suction forces experienced during entrapment against a
pool drain that is simple in operation, cost effective, and easily
integrated with existing pools.
SUMMARY OF THE INVENTION
[0009] The present invention advantageously provides a method and
system for reducing and/or eliminating suction forces experienced
during entrapment against a pool drain that is simple in operation,
cost effective, and easily integrated with existing pools. In
particular, the pool safety system of the present invention may
include a housing, where the housing defines a housing base, a
housing sidewall extending upward from the housing base, a first
opening in one of the housing base and housing sidewall for
coupling to a pump, a second opening in one of the housing base and
housing sidewall for coupling to a pool drain, and a third opening
in one of the housing base and housing sidewall for receiving water
from the surface of a swimming pool.
[0010] Moreover, the housing may be configured to limit an
experienced entrapment force by constructing the housing with a
predetermined dimension resulting in a predetermined water volume
and/or surface area. For example, by selecting and constructing the
housing with predetermined dimensions, the entrapment force
experienced upon blocking the swimming pool drain and thus water
flow through the second opening of the housing, the entrapping
force may be limited to a range of approximately 10-25 pounds of
force.
[0011] The system of the present invention may further include a
container, such as a skimmer basket, where the container defines a
basket bottom wall having an opening therethrough, a basket
sidewall extending from the basket bottom wall, and a rim along an
upper edge of the container. The container may further include a
container opening and a member extending from the container opening
to a point above the rim of the container. The elongate member may
define a member opening and a passage therethrough for placing the
container opening and the member opening in fluid communication.
The container may include a debris-retaining region within the base
and sidewalls for containing leaves or other items in pool, while
the member may be positioned within the debris-retaining region
such that the first opening is in fluid communication with the
opening in the basket bottom wall. During operation, the pool
system may provide a fluid flow path from the first opening of the
housing to the surrounding atmosphere such that the fluid flow path
is separated from the debris-retaining region of the skimmer
basket. As such, the system ensures that air is able to enter the
second opening of the housing in the event of an entrapment.
[0012] The present invention may further include a collector vessel
or container coupled to a swimming pool configured to reduce the
entrapment force experienced at a drain on a submerged surface of a
swimming pool in addition to and/or alternatively to the skimmer
housing 10 described above. The collector vessel may include a
first opening in fluid communication with a drain, a second opening
in fluid communication with a pump, and a third opening to allow
excess fluid to overflow out of the vessel. The collector vessel
may include an extension element in fluid communication with/or
otherwise coupled to the first opening. The extension element may
be movably positionable about the first opening to adjust the
effective column of water height above the first opening and to
further ensure that the entrapment force at the drain is minimized
to a desirable degree. In particular, the extension element may
include a body having a first extension opening, a second extension
opening, and a passage therebetween. The first extension opening
may be coupled to the first opening of the vessel. The extension
element may then be manipulated such that the second extension
opening is offset from the first extension opening to provide a
height from the water surface level of approximately 5 to 20
inches.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] A more complete understanding of the present invention, and
the attendant advantages and features thereof, will be more readily
understood by reference to the following detailed description when
considered in conjunction with the accompanying drawings
wherein:
[0014] FIG. 1 illustrates an embodiment of a housing in accordance
with the present invention;
[0015] FIG. 2 shows an embodiment of a container in accordance with
the present invention;
[0016] FIG. 3 is a cross-sectional view of an embodiment of a
container positioned in a housing in accordance with the present
invention;
[0017] FIG. 4 is a cross-sectional view of an embodiment of a
collector vessel in accordance with the present invention;
[0018] FIG. 5 is an illustration of a pool safety system
configuration in accordance with the present invention; and
[0019] FIG. 6 is an additional schematic of a pool safety system
configuration in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0020] The present invention provides a safety system and method of
use thereof for reducing and/or eliminating suction forces
experienced during entrapment against a pool drain that is simple
in operation, cost effective, and easily integrated with existing
pools. Now referring to FIG. 1, the system may include a housing 10
for use with a swimming pool (not shown) having a pump (not shown).
Of note, as used herein, the term "swimming pool" is intended to
include traditional in-ground swimming pools, above-ground swimming
pools, spas, or any other large, water filled container having a
circulation system with fluid flow therethrough. The housing 10 may
contain one or more openings in fluid communication with the
swimming pool, pump, and the like. For example, the housing 10 may
be a skimmer housing 10 commonly found with existing pools
installed just below the surface adjacent to a side of the swimming
pool. The housing 10 may define a largely hollow interior cavity
having a top portion 12, a lower wall 14, and one or more sidewalls
16 extending therebetween.
[0021] In particular, the housing 10 may further include a first
opening 18 in fluid communication with the pump, as well as a
second opening 20 in fluid communication with a drain located along
a surface of the swimming pool. Of note, although a single opening
20 in fluid communication with a drain is shown for illustrative
purposes, in some applications the housing 10 may contain multiple
openings in fluid communication with multiple drains on submerged
surfaces of a swimming pool and/or spa. The first and second
openings may be located along either the lower and/or sidewalls of
the housing 10. In addition, the housing 10 may include a third
opening 22 along a sidewall of the housing 10 that is in fluid
communication with the pool in proximity to the water surface of
the pool, such that, under typical conditions, the surface of the
water of the pool is at a height between an upper and lower surface
of the third opening 22. An adjustable floating weir 24 may be
positioned in the third opening 22 to regulate the passage of
fluids and debris therethrough. In addition, the housing 10 may
also provide a fourth opening 26 along a sidewall 16 to provide a
vent or overflow path for drainage in the event the water level
rises beyond a desired or intended height. As such, a lower edge of
the fourth opening 26 may be adjacent to the water surface level of
the pool. The housing 10 may also include a lid 28 positionable
about the top portion 12 of the housing 10, where the lid may
further include an opening 30 therethrough.
[0022] The housing 10 may be configured to limit an entrapping
force experienced at the drain in the pool. In the event the drain
becomes obstructed, the resulting entrapping force is directly
correlated to the dimensions and resulting water volume of the
housing 10. In particular, the entrapping force experienced at the
drain coincides with the force experienced at the second opening 20
of the housing 10. The force experienced at the second opening 20
of the housing 10 is impacted by the water volume in the housing 10
and the corresponding hydrostatic differential head of the water
volume. The housing 10 may thus be configured and dimensioned such
that in the event of an entrapment, the maximum force experienced
at the pool drain is limited to enable a person or child to be able
to free themselves without additional aid. While the entrapping
force could never be completely eliminated as it would prevent a
swimming pool pump system from operating, the potential entrapping
force could be reduced to a safer level, i.e., in the range of
about 10-25 pounds. This reduced range of force may allow even
small children to overcome the entrapment force experienced and to
swim to safety. By configuring the housing 10 to provide a
predetermined hydrostatic differential, a correlating reduction of
the entrapment force experienced at the drain may be achieved.
[0023] As an example of a particular configuration, the second
opening 20 of the housing 10 may be located at a vertical distance
from the typical water surface level of the pool. As previously
discussed, the water level of the pool may be at least partially
dictated by a lower edge of the fourth opening 26, and as such, a
vertical distance "V" between the lower edge of the fourth opening
26 and an upper edge of the second opening 20 may define a height
of a column of water within the housing 10. It is known that a one
foot column of water correlates to 0.433 psi. Thus, the vertical
distance "V" is equal to a pressure of "V" multiplied by 0.433 psi.
By taking the resulting value and multiplying it by the open
surface area of the drain, the resulting entrapment force may be
calculated. For example, should the vertical distance "V" equal 11
inches, the resulting pressure would be (11 inches/12
inches-per-foot).times.0.433 psi=0.397 psi. Now, in the case where
the drain has an open area of approximately 40 square inches, the
force is equal to 0.397 psi.times.40 square inches=15.87 pounds of
force. Of course, while specific measurements have been provided,
the dimensions of the housing 10 for a particular application may
vary in order to achieve a predetermined, limited entrapment force
experienced at the drain, and the distance "V" may vary between
approximately 6 inches and approximately 20 inches.
[0024] As shown in FIGS. 2 and 3, the system of the present
invention may further include a container 32 positionable within at
least a portion of the housing 10. The container 32 may include a
skimmer basket or the like, where the container 32 may define a
container bottom wall 34 with an opening therethrough, and one or
more container sidewalls 36 extending upward around a periphery of
the bottom wall, where the one or more sidewalls define a rim or
top edge of the container when oriented in a position for use. The
container bottom wall 34 and the container sidewalls 36 define a
debris-retaining region 38 for collecting items floating in the
pool as they are drawn into the container 32 by the circulation of
the pool water. One or more apertures 40 may be situated about the
container bottom wall 34 and/or the one or more container sidewalls
36 for allowing the passage of water therethrough while retaining
larger objects and debris contained within the debris-retaining
region 38 for subsequent cleaning or removal. The container may
include a myriad of shapes and dimensions which can be varied for a
particular use and/or application.
[0025] The container 32 may further include a member 42 extending
upward from an opening 44 in the container. The member may define a
member opening 46 positionable above the rim of the container for
providing fluid communication between the container opening 44 and
the member opening 46. Accordingly, the member may include a hollow
passage extending therethrough to achieve the desired fluid
communication. The member 42 may be positioned about one of the
bottom wall 34 or sidewall 36 of the container. Further, the member
42 may include a member sidewall extending between the first and
second openings, where the member sidewall is substantially void of
any openings such that a fluid and/or gas is largely prevented from
entering the hollow passage except through the container opening 44
and the member opening 46. It is contemplated that the container 32
may be constructed as an integral component through molding or
similar manufacturing methods, or, alternatively, assembled by
coupling one or more pieces together. The housing 10 may include a
shelf or other coupling feature to aid in the positioning and/or
retention of the container within the housing 10.
[0026] Referring to FIG. 3, in an exemplary use of the swimming
pool safety system of the present invention, the housing 10 is
coupled to a swimming pool such that the first opening 18 of the
housing 10 is in fluid communication with a pump, the second
opening 20 is placed in fluid communication with a drain on a
submerged surface of the swimming pool, and the third opening 22 is
placed in fluid communication with the water surface of the
swimming pool. During operation, fluid circulation provided by the
pump causes water to flow inward from both the second and third
openings, thereby providing fluid flow through the drain in the
swimming pool. The container 32 may further be positioned within
the housing 10 to catch debris or other objects drawn into the
housing 10, such that the debris is contained within the
debris-retaining region 38 of the container and thereby preventing
obstruction or clogging of the openings of the housing 10 and
subsequent interference with fluid circulation in the swimming
pool. Further, the member 42 of the container 32 may be situated
such that the member opening 46 is positioned above the water
surface 48 and in fluid communication with the surrounding
atmosphere. Where the housing 10 is covered by the lid 28, the
fluid communication between the member opening 46 of the elongate
member 42 of the container 32 and the atmosphere may be maintained
by positioning the opening 30 of the lid 28 adjacent to the opening
in the member 42.
[0027] In the event the drain of the swimming pool becomes
obstructed by a person in the swimming pool, the resulting blockage
and entrapment of the person prevents fluid from being drawn into
the housing 10 through the second opening 20. Despite the blockage,
the pump continues to draw water through the first opening 18,
resulting in a suction force experienced at the second opening 20,
and thus causing an entrapment force at the swimming pool drain.
However, as previously discussed, the actual entrapment force
experienced at the drain can be reduced and/or limited by
predetermined dimensions of the housing 10, including the vertical
height "V" separating the second opening 20 from the water surface
48. As such, by selecting and constructing the housing 10 to
contain predetermined dimensions, the entrapment force experienced
upon blocking the swimming pool drain and thus water flow through
the second opening 20 of the housing 10, the entrapping force may
be limited to a range of approximately 10-25 pounds of force.
Accordingly, due to the reduced entrapping force, an individual
should be able to pull themselves free of the swimming pool drain
and swim to safety.
[0028] Nevertheless, the potential remains that an individual may
not be able to free themselves from the drain, even with the
reduced entrapment force provided by the housing 10. As previously
discussed, despite the blockage of fluid intake through the second
opening 20 of the housing 10, the pump will continue to draw fluid
through the first opening 18. By continuing to draw fluid through
the first opening 18, the water volume in the housing 10 may begin
to decrease, causing the water level within the housing 10 to be
lowered towards the first opening 18. Once the water level within
the housing 10 is drawn below a top edge of the second opening 20,
the entrapping force caused by the suction of the pump will be
eliminated, as air will enter the second opening 20 to effectively
break the sealed vacuum and the resulting force. However, with
conventional skimmer baskets, the debris-retaining region of the
basket may be filled with leaves or other pool debris. Although the
basket itself may contain multiple openings to allow fluid flow
therethrough, the leaves and/or additional debris may effectively
block the openings. As a result, a filled conventional basket could
seal an upper portion of the housing 10, which would prevent the
pump from pulling the water level down and/or substantially
eliminate the chance that air may enter the housing 10 and further
into the second opening 20 to break the entrapment force at the
drain. Thus, a filled conventional skimmer basket could present a
substantially impermeable layer that obstructs any fluid from
passing through, which would cause substantially the full force of
the pump to pull directly on the second opening 20, and thus the
drain.
[0029] By positioning the container 32 of the present invention
within the housing 10, the member 42 of the container 32 may
provide a fluid flow path from the first opening 18, through the
container opening 44 and out of member opening 46 to the
surrounding atmosphere, where the fluid flow path is thus separated
from the debris-retaining region 38 of the container 32. As such,
regardless of the contents of the container 32, fluid communication
between the first opening 18 (and thus the pump), the water volume
within the housing 10, and ultimately the surrounding atmosphere,
is ensured. Consequently, upon a blockage of the drain of the pool
and thus the second opening 20 of the housing 10, the water level
of the housing 10 may be reduced to allow air to enter the second
opening 20 and to break the vacuum seal, thereby allowing an
entrapped individual to swim to safety.
[0030] Now referring to FIG. 4, the present invention may further
include a collector vessel 50 or container coupled to a swimming
pool, where the collector vessel 50 is dimensioned and configured
to reduce the entrapment force experienced at a drain on a
submerged surface of a swimming pool in addition to and/or
alternatively to the skimmer housing 10 described above. For
example, the collector vessel 50 may include a housing coupled to a
swimming pool, where the vessel 50 housing includes one or more
openings in fluid communication with one or more drains located
throughout the pool, as well as one or more openings in fluid
communication with one or more pumps providing water circulation
throughout the pool. In particular, the collector vessel 50 may
include a first opening 52 in fluid communication with a drain, a
second opening 54 in fluid communication with a pump, and a third
opening 56 to allow excess fluid to overflow out of the vessel 50,
which may be either in a sidewall of the vessel or a top opening
providing access to the interior of the vessel. Similarly to the
skimmer housing 10 discussed above, should a drain in the pool
become obstructed, the resulting entrapping force may be directly
correlated to the dimensions and resulting water volume of the
collector vessel 50. The vessel 50 may thus be configured and
dimensioned such that in the event of an entrapment, the maximum
force experienced at the pool drain is limited to enable a person
or child to be able to free themselves without additional aid,
i.e., in the range of about 10-25 pounds.
[0031] As an example of a particular configuration, the first
opening 52 of the vessel 50 may be located at a vertical distance
from the water surface level 58 within the vessel 50. This water
surface level may be at the top of the housing, just below the
third opening 56, or simply at a height between the second opening
54 and a top edge of the vessel 50. Regardless of how the water
surface level is achieved and/or attained in the vessel 50, a
vertical distance "V" between the water surface level 58 and an
upper edge of the first opening 52 may define a height of a column
of water within the vessel 50. As discussed above, a vertical
column of water of approximately 11 inches between the first
opening 52 and the water surface in the vessel 50 results in
approximately 15.87 pounds of force experienced at the drain during
entrapment.
[0032] While collector vessels, auxiliary housings, and sumps may
be typically installed in a swimming pool system to regulate flow
rates of circulation, aid in filtration, etc., due to widely
varying pool designs and construction techniques, it would be very
difficult to install a collector vessel 50 such that the first
opening 52 is between approximately 5 inches and 20 inches from the
ultimate water surface level in the vessel 50. For example, when
constructing a pool, upon placement of the desired plumbing
conduits and such, the pool is sprayed with concrete, and
furthermore, tiling and other surface layers may also be added. As
the construction proceeds to completion, the plumbing may be offset
from the originally desired position, assuming the initial
placement was even accurate. As such, there may be a plumbing
conduit leading from a drain in the pool through a concrete
sidewall for connection to a collector vessel 50. The vessel 50
then needs to be positioned to connect to the fixed location of the
plumbing conduit while being aligned with or proximate to a top
edge of the pool. As such, variations in the location of the
conduit require modifications to the vessel 50, which would
necessarily affect the resulting column of water height above the
first opening 52 of the housing once installed.
[0033] Given the calculation above, it can be seen that variations
of even a few inches in the height of the column of water in the
vessel 50 or skimmer housing can drastically affect the ultimate
entrapment force experienced at the drain when the pool is in use.
Accordingly, the collector vessel 50 may include a port or opening
coupled to the drain, where the height or vertical positioning of
the port or opening is selectively adjustable and/or the effective
height of a water column above the port or opening is selectively
adjustable. For example, the collector vessel may include an
extension element 60 in fluid communication with/or otherwise
coupled to the first opening 52. The extension element 60 may be
movably positionable about the first opening 52 to adjust the
effective column of water height above the first opening 52 and to
further ensure that the entrapment force at the drain is minimized
to a desirable degree. In particular, the extension element 60 may
include a body having a first extension opening 62, a second
extension opening 64, and a passage therebetween. The first
extension opening 62 may be coupled to the first opening 52 of the
vessel 50. The extension element 60 may then be manipulated such
that the second extension opening 64 is offset from the first
extension opening 62 to provide a height from the water surface
level of approximately 8 to 14 inches. As a result, even if the
first opening 52 of the collector vessel 50 is at an undesirable
height or location from the top of the vessel 50 or where the water
surface will be, the extension element 60 allows the effective
height of the water above the first opening 52 to be adjusted by
adjusting the elevation of the second extension opening 64 to
provide the desired water column height, and thus the entrapment
force experienced at the drain. While an extension element has been
described to facilitate the height of a column of water above the
opening or port in communication with the drain, it is contemplated
that the collector vessel may include an opening on a track or
movable surface (not shown) to allow for adjustment, and further,
the collector vessel may include a plurality of discrete positions
(not shown) about which an opening or port may be selectively
located in order to control the resulting hydrostatic pressure
within the vessel and towards the drain.
[0034] Upon installing the collector vessel and positioning the
second extension opening at the desired height or elevation, the
collector vessel may function similarly to the skimmer housing
described above. During normal operation, water will flow through
the collector vessel and other components of a swimming pool's
circulation system. Should an entrapment occur at a drain submerged
in the swimming pool, the fluid in the collector vessel will be
drawn down towards the opening coupled to the pump until air enters
the extension element and/or the opening leading to the covered
drain. Once air enters the opening or conduit coupled to the drain,
the vacuum force experienced will be eliminated to allow an
entrapped person to swim to safety. Due to the manipulation of the
height of the column of water above the opening leading to the
drain, the suction force experienced at the drain is reduced until
the vacuum force is subsequently eliminated.
[0035] By providing for the adjustment of the effective height of
the column of water about the first opening 52 of the vessel 50,
inaccuracies or errors occurring during the construction of the
pool can be overcome to ensure appropriate operation and limiting
of the entrapment force at the drain. As such, the likelihood that
the entrapment force will exceed the desired range can be reduced
to ensure the safety of swimmers, and vice/versa, sufficient force
can be maintained to ensure that fluid flow throughout the
circulation system of the swimming pool is also at a desirable
rate.
[0036] Now referring to FIGS. 5 and 6, embodiments of a pool system
70 are shown. The pool system configuration may generally include
two or more drains located on a submerged surface of a swimming
pool, where the drains are coupled to a pump and a vent. The
placement of the drains and the conduits leading to the pump and
the vent may be configured to allow for a higher flow rate of fluid
through the system while maintaining a reduced operating drawdown.
In particular, the pool system 70 may include a first drain opening
72 and a second drain opening 74 located within a swimming pool.
Both the first and second drain openings may be in fluid
communication with a pump, as well as being in fluid communication
with a vent or opening 76 in fluid communication with the
surrounding atmosphere. The first and second drain openings may be
coupled through a drain line or conduit 78. Of note, as used
herein, the term "conduit" is intended to encompass a body or
element providing for the passage or flow of fluid. A conduit in a
particular application may either be continuous or include multiple
discrete sections coupled together. In addition, the pump may be
coupled to the first and second drain openings through a first pump
line 80 or conduit that intersects and/or forms a junction 82 with
the drain line 78. Similarly, the vent 76 may be coupled to the
first and second drain openings through a vent line 84 that also
intersects and/or forms a junction with the drain line 78, where
the location of the intersection between the drain line 78 and the
vent line 84 is at substantially the same location as the
intersection of the first pump line 80 and the drain line 78. The
vent line 84 may further be coupled to the pump through a second
pump line 86, where the vent line 84 defines a water height "H"
above the second pump line 86 when the system is in use, as shown
in FIG. 5. Alternatively, the vent line 84 may include a water
height "H" within the conduit above the junction as shown in FIG.
6. The height of the water column present in the vent line 84 that
is above the second drain line 86 or the junction 82 defines the
drawdown amount required to break a vacuum force and the resulting
pressure experienced at the pool drain openings during an
entrapment. It is desirable to limit the amount of water drawn down
through the vent line for a given rate of flow through the system
in order to reduce the likelihood of damage to the system and to
control the overall hydraulic conditions of the system.
[0037] During general operation of the pool system, water is drawn
in through both the first and second drain openings, while the vent
line 84 remains exposed to the surrounding atmosphere with a
particular water column height above the second pump line 86. In
the event of an entrapment, the pump will drawdown the water in the
vent line 84 located above the second pump line 86 or the junction
84, subsequently allowing air to enter into the second pump line 86
or the first pump line 80 and thereby breaking the vacuum force at
either drain opening. However, as water flows in both drain
openings and towards the junction 82 with the first pump line 80,
the fluid flow from each drain opening essentially collides at the
junction 82 as it is drawn towards the pump. This collision causes
an increase in static pressure, which results in a higher water
level in the vent line 84 as opposed to what the water height would
be if the vent line 84 intersected the drain line 78 elsewhere.
Accordingly, coupling the vent line 84 at the junction 82 takes
advantage of the increased static pressure, which enables the
system to operate at a lower draw down for a given flow rate. For
example, at flow rate "A," the pump may typically draw down seven
inches of water from the vent line. However, by placing the vent
line at the junction with the pump line, the operating draw down
may be reduced to five inches for the same flow rate. As a result,
the circulation rate through the pool system 70 may be increased
while keeping the water level in the vent line 84 at a higher
level, which reduces the likelihood that the pump will cavitate
and/or be damaged. In particular, the water column height above the
second pump line may be limited between 5 and 20 inches while
achieving higher flow rates through the system than would otherwise
be possible.
[0038] It will be appreciated by persons skilled in the art that
the present invention is not limited to what has been particularly
shown and described herein above. In addition, unless mention was
made above to the contrary, it should be noted that all of the
accompanying drawings are not to scale. A variety of modifications
and variations are possible in light of the above teachings without
departing from the scope and spirit of the invention, which is
limited only by the following claims.
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