U.S. patent number 3,702,484 [Application Number 05/199,853] was granted by the patent office on 1972-11-14 for light-weight, minimum-volume water pad.
This patent grant is currently assigned to Aqua Therm Products Corporation. Invention is credited to Arnold Semenoff, Sidney Tobinick.
United States Patent |
3,702,484 |
Tobinick , et al. |
November 14, 1972 |
LIGHT-WEIGHT, MINIMUM-VOLUME WATER PAD
Abstract
A low-water volume, low-weight water pad for use as a mattress
or seat pad consists of a water-filled container sandwiched between
an upper and lower layer of cellular foam sheets with a surrounding
water-impervious sheath which is loaded through openings in the top
of the sheath. The sheath serves as a flexible frame and tray for
containing water which may escape from the water-filled container.
The top surface of the sheath contains flaps at either end which
extend beyond the opening slits in the top of the sheath. These
flaps are enveloped inside of the sheath and around the bottom of
the foam layer. When used as a mattress, it may be placed directly
on a conventional inner spring. A rigid platform is shown which is
placed between water mattress and inner spring to provide a flat
surface for support of the water mattress.
Inventors: |
Tobinick; Sidney (Oldbridge,
NJ), Semenoff; Arnold (Fort Lee, NJ) |
Assignee: |
Aqua Therm Products Corporation
(Rahway, NJ)
|
Family
ID: |
22739294 |
Appl.
No.: |
05/199,853 |
Filed: |
November 18, 1971 |
Current U.S.
Class: |
5/668; 5/655.5;
5/680 |
Current CPC
Class: |
A47C
27/085 (20130101); A47C 27/18 (20130101) |
Current International
Class: |
A47C
27/14 (20060101); A47C 27/08 (20060101); A47C
27/18 (20060101); A47c 027/08 () |
Field of
Search: |
;5/348,348WB,349,350,60,91 ;150/1 ;229/55,87R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gay; Bobby R.
Assistant Examiner: Calvert; Andrew M.
Claims
The embodiments of the invention in which an exclusive privilege or
property is claimed are defined as follows:
1. A pressure distributing pad having the characteristics of a
water-filled mattress and having a minimum water volume and having
a relatively low weight; said pad comprising, in combination:
a generally flat, water-filled and water-impervious container
having upper and lower surfaces;
a compressible, thermally-insulating pad disposed in contact with
and being coextensive with said upper surface of said
water-impervious container;
an enclosed sheath of a flexible, water-impervious material
enclosing and closely fitting around said water-impervious
container and said thermally-insulating pad;
said enclosed sheath having top and bottom surfaces and side
surfaces joining said top and bottom surfaces; said bottom surface
and said side surfaces defining a shallow, water-impervious tank
for receiving and holding water from said container if water
escapes from said container;
said sheath having at least one elongated opening in its said top
surface to permit the loading of said container and said
thermally-insulating pad therein.
2. The pad of claim 1 wherein said at least one elongated opening
is formed adjacent the junction between said top surface and one of
said side surfaces of said sheath.
3. The pad of claim 1 wherein said thermally-insulating pad is
formed of a sponge rubber type material, and wherein said container
and said sheath are both formed of the same material.
4. The pad of claim 1 which further includes a second
thermally-insulating pad in contact with and generally coextensive
with the lower surface of said water-impervious container.
5. The pad of claim 1 which further includes a flap extending from
at least one of said side surfaces of said sheath, and means for
fastening said flap over said at least one elongated opening and to
said top surface of said sheath.
6. The pad of claim 2 wherein said top surface of said sheath has a
freely extending flap section which extends beyond said elongated
opening; said flap section having a length longer than the height
of said side section to permit said flap to be inserted into said
elongated opening and enveloped around the edges of said container
and said thermally-insulating pad which are adjacent said one of
said side surfaces of said sheath.
7. The pad of claim 4 wherein said container and said sheath are
each formed of a flexible plastic material having a thickness of
about 20 mils.
8. The pad of claim 6 which further includes a second flap
extending from at least one side surface of said sheath, and means
for fastening said second flap over said at least one elongated
opening, and to said top surface of said sheath.
9. The pad of claim 7 wherein said thermally-insulating pads are
formed of a sponge rubber type material; said thermally insulating
pad at said upper surface of said water container has a thickness
of from about 1/2 inch to about 3 inches, thereby to provide
thermal insulation; said second pad having a thickness of less than
about 4 inches; said water-filled pad having a thickness, when
filled, of less than about 3 inches.
10. The pad of claim 8 which further includes a second
thermally-insulating pad in contact with and generally coextensive
with the lower surface of said water-impervious container.
11. The pad of claim 9 wherein said at least one elongated opening
is formed adjacent the junction between said top surface and one of
said side surfaces of said sheath and wherein said top surface of
said sheath has a freely extending flap section which extends
beyond said elongated opening; said flap section having a length
longer than the height of said side section to permit said flap to
be inserted into said elongated opening and enveloped around the
edges of said container and said thermally-insulating pads which
are adjacent said one of said side surfaces of said sheath.
12. The pad of claim 10 wherein said thermally-insulating pads are
formed of a sponge rubber type material; said thermally insulating
pad at said upper surface of said water container has a thickness
of from about 1/2 inch to about 3 inches, thereby to provide
thermal insulation; said second pad having a thickness of less than
about 4 inches; said water-filled pad having a thickness, when
filled, of less than about 3 inches.
13. The pad of claim 11 wherein said sheath has a second elongated
opening in the top surface thereof; said second opening being
parallel to said one opening and being disposed adjacent a side of
said sheath which is opposite to its said one side; and a second
flap section, identical to said flap section, extending from said
top surface at said second opening.
14. The pad of claim 13 which further includes first and second
side flaps extending from opposite sides of said sheath, and means
for fastening said first and second side flaps over said at least
one elongated opening and said second elongated openings
respectively, and means for fastening said first and second side
flaps to said top surface of said sheath.
15. In combination, a mattress having the characteristics of a
water-filled mattress, and a conventional box spring support
therefor; said mattress having a minimum water volume and having a
relatively low weight; said mattress comprising, in
combination:
a generally flat, water-filled and water-impervious container
having upper and lower surfaces;
a compressible, thermally-insulating pad disposed in contact with
and being coextensive with said upper surface of said
water-impervious container;
an enclosed sheath of a flexible, water-impervious material
enclosing and closely fitting around said water-impervious
container and said thermally-insulating pad;
said enclosed sheath having top and bottom surfaces and side
surfaces joining said top and bottom surfaces; said bottom surface
and said side surfaces defining a shallow, water-impervious tank
for receiving and holding water from said container if water
escapes from said container.
16. The combination of claim 15 which further includes a flat, and
relatively rigid member generally coextensive with said mattress
and being disposed between said mattress and said box spring
support.
17. The combination of claim 16 wherein said relatively rigid
member includes an annular rim extending downwardly from the
periphery thereof and telescoping over said box spring.
18. The combination of claim 17 wherein said relatively rigid
member further includes an annular rim extending upwardly from the
periphery thereof for receiving portions of the outer periphery of
said mattress.
Description
BACKGROUND OF THE INVENTION
This invention relates to water-filled cushions and mattresses, and
more particularly relates to a low-volume water-filled pad which is
surrounded by foam layers and is mounted within a fluid-impervious
sheath which is flexible, and which serves the purpose of a means
for holding the mattress components in position and for collecting
any water which may be accidentally discharged from the normally
sealed pad.
Water-filled mattresses are generally well known and are commonly
constructed of a large vinyl container, frequently rectangular in
shape, which is filled with water. The container is then surrounded
by a rigid frame which prevents the sagging of the edges of the
liquid-filled bag. Conventional water mattresses or beds might
contain 200 gallons of water or more, and might weigh 2,000 pounds
or more. Consequently, water beds have found limited commercial
success since they require specially designed and reinforced
flooring for supporting the great weights involved and because of
the fear of purchasers of the possible flooding which could occur
if the water-filled mattress is punctured. It has been further
necessary to provide means for heating the water in a conventional
water bed since the mattress will feel extremely cold because of
the high thermal conductivity of water.
It has been previously suggested, for example, in U.S. Pat. No.
3,456,270, to reduce the weight and volume of water used for a
water bed while still producing the unique comfort and feel of a
water bed mattress. Thus, a relatively shallow container of water
is disclosed, which may be lined on the top with a layer of foam
material. The foam material permits the use of a smaller depth of
water for the water bed and also provides thermal insulation so
that the user of the mattress will not feel chilled when the water
of the water bed is not artificially heated as is the practice in
the conventional water bed. The use of this type mattress reduces
the weight sufficiently to permit the mattress to be supported on a
conventional bed or inner spring mattress. However, these
arrangements generally incorporate the conventional frame so that
the puncture of the water-filled container could cause flooding and
damage due to the escaped water from the container. Thus, the use
of such minimum volume arrangements have not, to our knowledge,
found great commercial success.
Moreover, when low-water volume mattresses are placed directly on
an old bed spring or other yielding or sagging surface, water tends
to collect at the bottom of the sagging surface and is not suitably
distributed over the mattress surface.
BRIEF SUMMARY OF THE INVENTION
A minimum-volume generally flat water-filled container is placed
between two coextensive foam rubber pads and the assembly is, in
turn, contained within a a flexible plastic sheath of
water-impervious material. The sheath, which may be of the same
material as the water-filled container, defines a tray having a
height sufficient to contain the entire volume of the water within
the container if the container should rupture. The tray shape has a
top cover integral therewith, where an elongated opening is
provided at one end of the top cover to allow insertion of the foam
rubber pads and water container. Note that the water container
preferably will be filled with water after it is loaded into the
plastic sheath. The plastic sheath then defines a tank for
preventing the possible escape of water which might be released
into the sheath from the container, due to accidental puncture or
rupture of the container. The assemblage is especially adapted to
be supported on a conventional bed-type support and can be mounted
directly on a conventional inner spring mattress.
The lower foam pad is provided to equalize pressure distribution
over the bottom of the water-filled container so as to reduce the
possibility of the puncture of the container by irregularities or
broken springs, or the like, on the support surface receiving the
water-filled mattress assemblage. Preferably, this lower foam pad
will have a thickness of about 4 inches for it to serve a proper
protective function.
The upper foam pad will have a thickness preferably of about
one-half inch, its main purpose being to provide thermal insulation
between the body of the user and the liquid-filled container. It
has been found that this upper foam pad can be as thick as about 3
inches before there is any substantial masking of the sensation one
expects from a water-filled mattress. The surrounding sleeve or
sheath then acts both as a safety liner for the mattress and a
frame for holding the water mattress components in positive
relation to one another, and for holding the mattress assembly in
its desired shape.
Flaps may then extend from the upper surface of the sheath and
beyond the end sides of the sheath, and over the slits at either
end of the sheath through which the sheath is loaded. These flaps
are then tucked down into the sheath and around the foam pads in
order to complete the mattress-like appearance of the
assemblage.
A flat support such as a plywood board or the like is preferably
interposed between a yielding support such as a soft or used inner
spring and the mattress to prevent collection of water in localized
regions due to sagging.
The water-filled pad can be shaped to the form of a conventional
bed mattress of any desired size and shape, and further has
important application as a seat pad, for example, for a
wheelchair.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top plan view of a conventional water container which
may be used in the present invention.
FIG. 2 is a side view partly in cross-section of the container of
FIG. 1.
FIG. 3 is a top view of the container or sheath of the present
invention.
FIG. 4 is a cross-sectional view of FIG. 3 taken across the section
line 4--4 in FIG. 3.
FIG. 5 is a cross-sectional view of FIG. 3 taken across the section
line 5--5 in FIG. 3.
FIG. 6 is a cross-sectional view through a water mattress
assemblage of the present invention, which includes the container
of FIGS. 1 and 2 sandwiched between upper and lower foam layers and
disposed within the sheath of FIGS. 3, 4 and 5.
FIG. 7 is a plan view illustrating the assembled mattress of FIG. 6
mounted on a conventional bed.
FIG. 8 is a perspective view of an assembly with a novel platform
mounted on a conventional inner spring.
FIG. 9 is a longitudinal cross-sectional view of the platform of
FIG. 8.
FIG. 10 is a plan view of a seat cushion made in accordance with
the invention.
FIG. 11 is a cross-sectional view of FIG. 10 taken across the
section line 11--11 in FIG. 10.
FIG. 12 is a plan view similar to FIG. 10 but with the outer seal
connected to the seat body by adhesive strips/
FIG. 13 is a top plan view of a water-filled sack which can be used
in a second embodiment of the invention for use as a cushion.
FIG. 14 is a cross-sectional view of FIG. 13 taken across the
section line 14--14 in FIG. 13.
FIG. 15 is a perspective view of a cushion outer liner and foam
pads therefor glued in position, which liner is to cooperate with
the water container of FIGS. 13 and 14.
FIG. 16 is a cross-sectional view of the assembled elements of
FIGS. 13, 14 and 15 to define a low-water volume cushion.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring first to FIGS. 1 and 2, there is illustrated therein a
typical water container 10 which could, for example, consist of an
upper sheet 11 and lower sheet 12 which are joined to one another
at their periphery by a heat seal 13. A conventional valve 14 is
provided in sheet 11 to permit a liquid such as water to be
introduced into the interior of the container 10. Note that
container 10 is a single empty volume and that there are no
internal compartments or webs designed to hold the container in a
particular shape.
In a typical embodiment of the invention, where the water mattress
is to be mounted on a conventional, but relatively narrow bed, the
container 10 may have a width of about 36 inches and a length of
about 72 inches. The container 10 is then adapted to receive from
about 25 to 30 gallons of water which will inflate the container 10
to a thickness of from 2 to 3 inches. Typically, the container 10,
when filled with water, will weigh up to about 270 pounds. This is
to be contrasted to the more conventional water bed which may weigh
about 2,000 pounds when filled.
Clearly, the mattress could take any desired form or size, other
than the narrow rectangle shown.
The sheets 11 and 12 may be of any desired material having the
necessary thickness to provide the structural strength necessary
for use as a mattress. Good results have been obtained when using a
polyvinyl chloride material having a thickness of about 20
mils.
In accordance with the invention, the water container of FIGS. 1
and 2 (shown filled in FIG. 2) is loaded into a sleeve which acts
as both a safety liner and frame, where the sleeve is illustrated
in FIGS. 3, 4 and 5. Thus, the sleeve 20 may be formed of the same
20 mil vinyl material as is used to form the container 10 and has a
top layer 21, a bottom layer 22, and four side regions 23, 24, 25
and 26.
The bottom layer 22 along with the sides 23 to 26 can be fabricated
in any desired manner, as by having their adjoining edges
heat-sealed to one another, thereby to define a water impervious
tray which has sufficient volume to contain at least all of the
water which could fill the container 10 of FIGS. 1 and 2. If
desired, these edges could be sealed by a suitable, commercially
available, vinyl adhesive tape.
The upper layer 21 of sheath 20 may be heat-sealed or otherwise
suitably secured to the tops of sides 24 and 26. However, slits 27
and 28 (FIGS. 3 and 4) are left between the opposing ends of layer
21 and the sides 23 and 25. These slits are provided to permit
loading of the container 10 and of foam rubber layers into the
interior of sheath 20. The ends of the upper layer 20 are further
provided with flaps 29 and 30, respectively, which extend beyond
sides 23 and 25, which flaps extend downwardly from slits 27 and
28, respectively, and may envelope around the bottom of sheath 20.
Side regions 23 and 25 may also have flap portions 23a and 25a
respectively, which are sealed to top layer 21 after the mattress
is placed in its desired position and is filled with water.
FIG. 6 illustrates the sheath of FIGS. 3, 4 and 5 after it has been
loaded with the container 10 of FIGS. 1 and 2, and with upper and
lower foam rubber pads 40 and 41, respectively. The pads 40 and 41
are substantially coextensive with the upper and lower layers 21
and 22 of sheath 20 and may be of a conventional foam rubber.
The upper pad 40 is preferably about one-half inch thick and serves
to provide thermal insulation between the user's body and the
relatively cold upper surface of container 10. It has been found
that pad 40 can have a thickness of up to about 3 inches before it
begins to mask the effect of the water-filled container 10 in its
action as a water-filled mattress.
The lower pad 41 serves to protect the bottom of container 10 from
damage due to sharp springs, or the like, on the surface upon which
the water mattress assemblage is subsequently deposited. Thus, the
pad 41 may have any desired thickness. A pad having a thickness of
about 4 inches for the pad 41 has been found satisfactory.
Each of the flaps 29 and 30 in the sheath 20 may have a length of
about 18 inches and are tucked under the lower foam pad 41, as
shown in FIG. 6. Thus, the entry regions are generally masked by
these flaps and the flaps prevent the accidental displacement of
the components from the sheath. While any desired material could be
used for the sheath 20, manufacturing techniques are simplified
when this sheath is made of the same material as the container 10.
Thus, the sheath 20 may be constructed of 20 mil thick vinyl
material.
After assembly of the various components 10, 40 and 41 within and
before filling the sheath 20, the sheath may be laid atop any
conventional bed support. Thus, as shown in FIG. 7, there is a
conventional bed frame 50 which has a conventional inner spring
mattress 51 thereon. The novel water mattress assembly 52 of FIG. 6
may then be directly deposited on the inner spring 51, and the
assemblage can then be filled with water by filling the container
10 through valve 14. If desired, the entire bed may be moved to a
conventional hose outlet and the mattress filled at the outlet. The
entire bed may then be carried to its location, this being possible
in view of the relatively light weight of the assemblage.
Conventionally, however, a fitting will be attached to the nearest
water outlet and connected to a hose which is, in turn, connected
to valve 14.
After the container 10 is filled, flaps 23a and 25a are folded down
as shown in FIGS. 6 and 8 and are secured to layer 21 of sheath 20,
thereby to close slits 27 and 28. Thus, flap 23a is secured to
layer 21 by tape strip 60 (across the end of the flap 23a) and tape
strips 61 and 62 (along the edges of the flap 23a) as shown in
FIGS. 6, 7 and 8. Similarly, three tape strips 62, 63 and 64 are
used to secure flap 25a. Tape strips 60 to 64 may be conventional
vinyl tape strips, well known for the connection of vinyl members
to one another.
When using the water-filled pad of the invention as a mattress to
be supported by an inner spring which may sag, it has been found
that water tends to collect at the lowest points of the sag, and
therefore tends to aggravate the sag condition, leading to further
local accumulation of water. To prevent this condition, it has been
found useful, especially in connection with yielding support
surfaces, to provide a fairly rigid, flat reinforcing surface. By
way of example, a simple plywood board of about one-eighth inch
thickness is shown in FIG. 7, interposed between assembly 52 and
inner spring 51.
When the arrangement of FIGS. 1 to 7 is used for a hospital bed, it
has been found useful to terminate the water-filled container 10
about 20 inches short of the head of the mattress, with only foam
pads 40 and 41 filling the head portion of the mattress. This
allows the head of the bed to be moved to an inclined position
without disturbing fluid distribution in the remainder of the
mattress.
FIGS. 8 and 9 illustrate a particularly useful form of flat, rigid
support, consisting of a plastic frame 80 which has a downwardly
extending rectangular rim 81 which telescopes over a supporting
mattress, and which also has an upwardly extending rim 82 which
serves to position assembly 52 when laid on top of frame 80. The
central body of frame 80 consists of a main web 83 having a flat
upper surface 84 and integral transverse reinforcing ribs such as
ribs 85, 86 and 87. Typically, frame 80 can be formed of molded
polystyrene with web 83 having a thickness of about one-quarter
inch and ribs 85 to 87 having a thickness of about three-quarters
of an inch. The ribs may be spaced from one another by about 12
inches. Rim 81 may have a height of about 2 inches, while rim 82
may have a height of about 1 inch.
In the above description, the novel invention is described
primarily for use as a bed mattress. The novel invention, however,
may also be used in connection with seat pads for chairs, and
particularly for wheelchairs, and the term mattress as used herein
is intended to be synonymous with seat pads or cushions, or indeed,
a head rest or pillow. FIGS. 10, 11 and 12 show a specific
embodiment of the invention, for use as a seat cushion.
Referring to FIG. 10, there is shown an outer sleeve 90, similar in
purpose to sleeve 20 of FIG. 3, but shaped to fit on the contour of
a chair, for example, a wheelchair. Sheath 90 is suitably sealed to
define a closed volume with a single entrance slit 91 formed in a
side edge thereof. Two flaps 92 and 93 extend from the sides of
slit 91. Sheath 90 is then loaded, as shown in FIG. 11, through
slit 91, with foam pads 94 and 95, with a water-filled vinyl
container 96 between them. The flap 93 is then tucked under pad 93
and flap 92 is sealed over slit 91 and to the top surface of sheath
90, as shown in FIG. 12, by the side adhesive strips 97 and 98 and
the transverse adhesive strip 99.
In use, the cushion of FIGS. 10, 11 and 12 may be placed on the
flat bottom support of a wheelchair, and no interposed rigid plate
is needed, as was the case for a bed mattress. Moreover, in view of
the short dimensions of the cushion, good results are obtained
where the cushion is placed on a yielding bottom support, without a
rigid flat base.
FIGS. 13 to 16 show a further embodiment of the invention as
applied to a seat pad which has particular application, for
example, to wheelchairs, although it has any general seating
application.
Referring first to FIGS. 13 and 14, there is illustrated a
water-filled container 110 consisting of two sheets of 20 mil vinyl
111 and 112, respectively, which may be heat-sealed or otherwise
suitably secured around a periphery 113. A heat seal is
schematically illustrated in FIG. 14 at the region of the dotted
lines 114-115.
In accordance with the invention, the water-filled cushion may have
some suitably small length and height so that it can be received on
a conventional seat and could, for example, be 12 inches by 12
inches, with the peripheral lip 113 having a length of, for
example, one-half inch.
Before sealing the two sheets 111 and 112 together, their interior
is filled, by way of example, with 1 gallon of water, and the seal
is made with air being excluded from the interior of the sealed
volume. Alternatively, sheets 111 and 112 can be filled through a
conventional valve.
An enclosing sheath for enclosing the water container is then
formed, as illustrated in FIG. 15, of an elongated sheet of 20 mil
vinyl 120 formed of two flaps 121 and 122 (which may be separate
flaps and which have dimensions slightly larger than those of
sheets 111 and 112). Foam rubber layers 123 and 124 are then
cemented to the opposing surfaces of sheets 121 and 122,
respectively, as shown.
Thereafter, the water-filled container of FIGS. 13 and 14 is
inserted between foam pads 123 and 124 and, as shown in FIG. 16, a
further heat seal is formed between the opposing outer edges 130
and 131 and the extending lip 113 of the water-filled container
110. This final heat sealing, schematically shown in FIG. 16 by
dotted lines 132 and 133, secures the assembly together and further
forms an additional heat seal preferably spaced from the heat seal
at lines 114 and 115 of FIG. 14, so that a further water seal is
formed in the container 110.
It has been found that this minimum water cushion provides
excellent results in connection with patients who are confined to
long periods of sitting in wheelchairs, and the like. Thus, even
though there is a minimum volume of water used, and even though it
is a simple matter to "bottom out" by localized pressure on the
pad, it is nevertheless possible to suspend the patient sitting
erect in such a manner that pressure is evenly distributed over the
buttocks of the patient.
Although this invention has been described with respect to its
preferred embodiments, it should be understood that many variations
and modifications will now be obvious to those skilled in the art,
and it is preferred, therefore, that the scope of the invention be
limited, not by the specific disclosure herein, but only by the
appended claims.
* * * * *