U.S. patent number 3,908,206 [Application Number 05/501,344] was granted by the patent office on 1975-09-30 for automatic water level keeper for swimming pools.
Invention is credited to Chester H. Grewing.
United States Patent |
3,908,206 |
Grewing |
September 30, 1975 |
Automatic water level keeper for swimming pools
Abstract
A body of water in a water tank located adjacent the upper rim
of an above-ground swimming pool is connected by a pipe to a body
of water in the swimming pool. The water levels in the pool and in
the tank are thereby equalized; and a water supply line connected
to a float valve in the tank provides make-up water for the
swimming pool when the water level in the pool falls below a
predetermined height of the water level in the tank. The pool water
level can be established and maintained at any desired height by
suitably elevating or lowering the tank in accordance with
calibrated indicia.
Inventors: |
Grewing; Chester H.
(Sacramento, CA) |
Family
ID: |
23993160 |
Appl.
No.: |
05/501,344 |
Filed: |
August 28, 1974 |
Current U.S.
Class: |
4/508; 137/426;
137/428 |
Current CPC
Class: |
E04H
4/12 (20130101); F16K 31/26 (20130101); Y10T
137/7413 (20150401); Y10T 137/742 (20150401) |
Current International
Class: |
F16K
31/26 (20060101); E04H 4/00 (20060101); E04H
4/12 (20060101); F16K 31/18 (20060101); E04H
003/16 (); F16K 031/18 () |
Field of
Search: |
;137/426,428
;4/172.13,172.14,172.15,172.16,172.17,172.18,172.19,172.21,172,172.11,172.12 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Cohan; Alan
Attorney, Agent or Firm: Lothrop & West
Claims
What is claimed is:
1. An automatic water level keeper in combination with an
above-ground swimming pool having a circumferential wall of
predetermined height, said keeper comprising:
a. a water tank located adjacent the outer periphery of said
wall;
b. a float actuated valve mounted on said tank, said valve being so
dimensioned as to open and close in response to the presence of
water in said tank at a level which is respectively less than and
more than a predetermined height;
c. a water hose connected to the supply side of said valve
discharging into said tank, said valve opening to permit the
discharge of water into said tank when the water level in said tank
falls below said predetermined height, and closing to prevent the
discharge of water into said tank when the water level in said tank
rises above said predetermined height;
d. pipe means connecting said tank and said pool for equalizing the
water level in said tank and said pool;
e. a vertically telescoping ground supported standard supporting
said tank, said telescoping standard including indicia effective to
indicate the height above ground to which said tank is to be
located to establish the desired height above ground of the water
level of said pool.
Description
The invention relates to improvements in devices for establishing
and maintaining the desired water level in swimming pools.
The prior art as well as the market place are replete with devices
for monitoring and controlling the water level in swimming pools.
So far as is known, however, the desired water level in the pool
has heretofore been established by adjusting a float valve to
operate at a given height. In order to provide this type of
adjustment, the float valves previously used have been somewhat
expensive and have required at least a moderate degree of
mechanical aptitude to effect re-setting.
It is therefore an object of the invention to provide a water level
keeper in which the float valve requires no adjustment in order to
maintain the water level in a swimming pool at the desired
height.
It is another object of the invention to provide a water level
keeper which is particularly useful in connection with above-ground
swimming pools.
It is a further object of the invention to provide a water level
keeper which is relatively inexpensive and which can readily be
installed and adjusted by anyone.
It is still a further object of the invention to provide a water
level keeper which requires no attention, has but few moving parts
to get out of order and is sturdy, reliable and long-lived.
It is another object of the invention to provide a generally
improved automatic water level keeper which, although not limited
thereto, finds especial utility in above-ground swimming pools.
Other objects, together with the foregoing, are attained in the
embodiment described in the following description and illustrated
in the accompanying drawing in which:
FIG. 1 is an isometric perspective view of the water level keeper
installed on a conventional above-ground swimming pool; and,
FIG. 2 is a sectional view to an enlarged scale, the plane of the
section being indicated by the line 2--2 in FIG. 1.
While the water level keeper of the invention is susceptible of
numerous physical embodiments, depending upon the environment and
requirements of use, several of the herein shown and described
embodiments have been made, tested and used, and all have performed
in an eminently satisfactory manner.
The water level keeper of the invention, generally designated by
the reference numeral 12, is particularly useful in combination
with a conventional above-ground swimming pool 13 comprising
upright side walls 14 of steel or wood with an upper rim 16 on
which is mounted the upper margin 17 of a liner 18 of vinyl
material, or the like. It is to be noted however, that the water
level keeper could also be used in conjunction with ground level
pools by locating the device in a pit adjacent the pool.
In customary manner, the pool is filled with a body 21 of water to
a water level 22 located at a height several inches below the rim
16. Water displaced by swimmers raises the water level, and
splashing, diving, water fights and other activities almost
invariably results in the loss of a substantial amount of water
over the sides. Evaporation uncompensated for by rainfall tends
further to lower the water level and could, during an extended
period of inattention, such as when the owner is on vacation, lead
to an undesirably low water level conducive to high algae build-up
and the like.
In order to maintain the pool water level 22 at a desired height H
above ground level 24, the water level keeper of the invention 12
includes a tank 25 comprising a bottom 26, front side wall 27, rear
side wall 28, left end wall 29, right end wall 30, and top 31.
The tank 25 contains a body 32 of water in communication with the
pool body 21 of water by means of a pipe 33, conveniently a
flexible hose. The pipe 33 equalizes the respective water levels in
the tank 25 and the pool 13, thus enabling the mechanism in the
tank 25 accurately to sense the mean level of the pool water
without distortion caused by splashing or by surface disturbances
in the pool resulting from gusts of wind and the like. An opening
35 in the tank wall affords a vent and overflow.
The height h of the water level in the tank 25 is sensed by a float
valve 41 comprising a buoyant float 42 attached to an arm 43
pivotally mounted on a fulcrum pin 44 and connected by a pivoted
rod 45 to a spherical valve 46 translatable within a sleeve type of
valve body 47. The valve 46 is movable between a first, upper
closed position wherein the valve equator is immediately upstream
from a lateral discharge opening 48 in the valve body 47 and a
second, lower, open position wherein a passageway is afforded for
the flow of make-up water from a supply line 49 through the opening
48 to the tank 25, thence through the pipe 33 to the body 21 of
water until the water level in the pool is restored to the desired
height H. The supply line 49 is connected to a faucet 50.
The operation of the float valve 41 is preferably established at
the factory so that no additional adjustment of the float level is
necessary. In other words, the float, float arm, fulcrum and valve
are so dimensioned that when the water level in the tank falls
below the predetermined height h, the valve opens, allowing make-up
water to flow into the pool; when the water level in the tank
reaches the height h, the ball valve 46 closes and make-up water
stops flowing.
As appears most clearly in FIG. 2, the pool water level 22 is shown
at the desired height H and the tank water level 36, at elevation
h, is on the same horizontal plane as the pool water level 22.
If the pool water level 22 drops, the tank water level 36 will
lower accordingly, thereby opening the float valve 41 and allowing
make-up water to flow into the pool until the pool reaches the
desired level H and the tank water level reaches the height h, at
which juncture the float valve closes.
Should heavy rain fill the pool, surplus water will drain off
through an overflow pipe 51 in the pool wall. In due course,
evaporation will lower the water level until normal operation of
the float valve is resumed.
In the event the user prefers either to raise or lower the height H
of the pool's water level, the tank 25 is elevated or lowered by
loosening the set screws 52 in the two telescoping pair of support
legs 53 and 54, supported by ground pads 55, followed by
lengthening or shortening the legs and retightening the set screws
52. For convenience, calibrated indicia 56 can be inscribed on the
leg 53 in order to establish the desired pool level more
readily.
In some installations, it is preferred to substitute for (or to use
in addition to) the legs 53 and 54 a pair of hangers 61 adjustably
mounted on the tank, as by fasteners 62, and including recurved
hooks 64 embracing the upper rim of the pool walls, as appears most
clearly in FIG. 2.
When it is desired to lower the pool water level H, say, by 2
inches, the tank 25 is lowered 2 inches, thereby resulting in the
transfer of water from the pool to the tank and raising the tank
water level 36 above the operative height h. The float valve in
this case would remain closed until evaporation, splashing or other
causes diminishes the pool water level to the newly established
height H.
If, on the other hand, it is thought advisable to raise the pool
level 22 to a higher desired elevation H, the tank 24 would be
lifted correspondingly so that the predetermined tank water height
h required to actuate the float valve is positioned on the same
horizontal plane as the newly desired absolute, or above-ground,
height H. In this event, assuming the new height H is higher than
the existing pool water level 22, the tank water level 36 would
fall below the operative height h of the float valve by reason of
outflow from tank to pool via the pipe 33; and the float valve 41
would immediately open and allow make-up water to flow into the
pool until the pool water level 22 attains the desired pool height
H and the tank water level 36 reaches height h, at which juncture
the float valve cuts off the make-up water supply.
It can therefore be seen that I have provided an automatic water
level keeper which can be used to especial advantage in an
above-ground swimming pool and which is not only readily installed
but also reliable, trouble free in operation and easily adjusted to
provide any desired water level in the pool without having to
re-set a float valve.
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