U.S. patent number 3,710,409 [Application Number 05/023,591] was granted by the patent office on 1973-01-16 for linear inflatable module device.
Invention is credited to William M. Davidson.
United States Patent |
3,710,409 |
Davidson |
January 16, 1973 |
LINEAR INFLATABLE MODULE DEVICE
Abstract
In combination with a load supporting member, such as a cable,
strap, belt, or the like, a linear inflatable buoyancy device, or
plurality thereof, of elongated, generally cylindrical form that
conforms in shape with and may be made an integral part of said
load supporting member, comprising a flexible, expansible bladder,
contained within a flexible, expansible, retaining sleeve, which in
turn is folded within and protected by a flexible outer casing, in
combination with a gas source, gas delivery means and actuating
means for release of said gas to inflate said inflatable module.
The structure permits use of the same inflatable module for a
variety of applications by interconnecting a plurality of said
modules, by means of conventional mechanical and pneumatic
couplings and fasteners, in configurations suitable for life
saving, boat safety, mooring and other surface and sub-surface
marine uses. Means are also provided within said inflatable module
for adjustment of the amount and location of buoyancy obtainable
upon inflation thereof.
Inventors: |
Davidson; William M. (Mountain
Lakes, NJ) |
Family
ID: |
21816073 |
Appl.
No.: |
05/023,591 |
Filed: |
March 30, 1970 |
Current U.S.
Class: |
441/6; 441/80;
441/23 |
Current CPC
Class: |
B63C
9/23 (20130101); B63C 9/08 (20130101); B63B
2043/145 (20130101) |
Current International
Class: |
B63C
9/00 (20060101); B63C 9/08 (20060101); B63c
009/08 () |
Field of
Search: |
;9/311,312,313,316,329,336-345 ;114/54 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Buchler; Milton
Assistant Examiner: Sauberer; Paul E.
Claims
We claim:
1. An inflatable, flexible, elongated buoyancy device arranged in
lineal configuration and comprising:
a. A first elongate, perforate, flexible sheet, said sheet being
folded upon itself along its long axis whereby an elongate
enclosure with apertures at either end is formed by said folded
sheet and the elongate edges of said folded sheet are arranged to
define an elongate opening in communication with said
enclosure;
b. A second elongate, flexible sheet, loosely arranged and freely
disposed within said enclosure and constructed and arranged therein
whereby an inflatable bladder, having gas fill ports at either end,
is defined within said enclosure continuously along its elongate
dimension;
c. A third elongate, flexible, outer casing connecting said
elongate edges of said first elongate sheet, one of said elongate
edges being affixed to said elongate outer casing along its entire
elongate dimension and the other elongate edge thereof being
releasably attached to said elongate outer casing along its
elongate dimension by means of fasteners, such as zippers;
d. Means for inflating and venting said bladder from either end of
its elongate dimension, such as by gas fill tubes, said means being
secured to said bladder with gas tight seals and said means being
releaseably inserted through said apertures at either end of said
elongated enclosure.
2. The apparatus of claim 1 wherein releasable fasteners, such as
zippers, are affixed externally to said perforate sheet along one
or more elongate seams spaced apart circumferentially and in
parallel with said elongate edges of said perforate sheet, said
releasable fasteners being made of predetermined lengths and
affixed to said perforate sheet in juxtaposition to mating
fasteners affixed to said outer casing whereby the volume of said
bladder may be varied along its elongate dimension by selective
attachment of said perforate sheet to said outer casing along the
elongate dimension of said buoyancy device.
3. The apparatus of claim 1 wherein said elongate outer casing is
arranged continuously enveloping the exterior of said perforate
sheet whereby said perforate sheet and said bladder enclosed
therein will self-fold compactly within said outer casing when said
buoyancy device is vented and stretched taut along its elongate
dimension.
4. The apparatus of claim 1 wherein an elongate, load member, such
as a strap or cable, is embodied within or affixed to said outer
casing along its elongate dimension.
Description
This invention relates to inflatable buoyancy devices having
multiple uses such as for life preservers, boat safety, mooring,
lifting submerged objects and other normal or emergency buoyancy
applications.
One object of this invention is to provide an inflatable device in
the configuration of a linear strap or band such that it can be
worn in a loop as a life jacket, can be used as a life buoy, can be
wrapped around submerged objects, can be floated as a spar buoy to
mark the location of a submerged object, can be strapped together
in parallel strips to form a mattress or raft, as well as numerous
other normal or emergency buoyancy uses akin to the manner in which
straps, bands, ropes, cables and other tension members are used in
and around the water.
Another object of this invention is to provide an inflatable
buoyancy device of the foregoing character which is capable of
being worn or stored on boats or on near-water facilities in a
small compact package with the inflatable portion folded in such
manner that the package is comfortable to wear or use in the form
of a cushion or backrest when not employed for flotation
purposes.
Another object of this invention is to provide an inflatable
buoyancy device of the foregoing character wherein the shape of the
inflatable member can be altered by the user to suit the flotation
requirements of different applications, such as its use as a spar
buoy in one instance and then changing the shape so that the same
device can be used as a life jacket.
Still another object of this invention is to provide a device of
the foregoing character that can be economically made, easily
repacked after use and reused numerous times without replacement of
the inflatable member or other component parts, with the exception
of the gas source.
Other objects and advantages of this invention will become apparent
from the following description taken in conjunction with the
accompanying drawings, in which:
FIG. 1 illustrates pictorially several of the possible uses for
this invention. FIG. 1(a) depicts an inflatable module device
formed into the configuration of a life jacket. FIG. 1(b) shows a
plurality of linear module devices attached to the gunwales of a
boat. FIG. 1(c) illustrates one method for using the device, or a
plurality thereof, for emergency buoyancy to aid in removing a
stranded boat from a sandbar, FIG. 1(d) illustrates a mooring
application where the inflatable device is used as a spar buoy.
FIG. 1(e) shows a cross-section view of a boat hull that further
illustrates the method of using a plurality of such devices coupled
together with a rope attached at either end. FIG. 1(f) illustrates
a method of inter-connecting a plurality of inflatable modules
together to form a life raft.
FIGS. 2a-2g illustrates one method of construction for a preferred
form of linear inflatable module device. FIG. 2(a) presents a
cross-section view of an inflatable module having gas ports at
either end and a closure that restricts expansion of the bladder
midway between the ends of said device. FIG. 2(b) shows a plan view
of the same device when deflated and packed within the outer
casing. FIG. 2(c) shows a side elevation of the same device
deflated and packed. FIG. 2(d) is a cross-section view at 2--2 in
the deflated and packed condition. FIG. 2(e) is a cross-section
view at 2--2 with the device inflated. FIG. 2(f) is a longitudinal
cross-section view of an inflated element. FIG. 2(g) is a
longitudinal cross-section view of the same element when deflated
and packed.
FIG. 3 presents a cross-section view at 3--3 of the device
illustrated in FIG. 2(a) to illustrate the method of altering
configuration of the inflatable portion of the device.
Referring now to FIGS. 1a-1f, numeral 1 indicates in its entirety a
complete inflatable buoyancy device as described herein. The device
can be used in many different ways as illustrated and further
described as follows: FIG. 1(a) shows device 1 used as a life
jacket in the manner of a collar or yoke that may be worn around
the neck or over the shoulder. Device 1 is normally a linear
inflatable device as illustrated elsewhere in FIGS. 1a-1f. When
worn as a collar, the ends of device 1 can be fastened to each
other by means of a suitable fastener 8, such as a clasp, and
secured to the waist of the wearer by means of separable belt 4a.
Alternatively, the edges of device 1 may be fastened together by
means of a zipper in the manner of a vest. FIG. 1(b) shows device 1
attached to the gunwales of a boat and to the back of the seats for
emergency use in the event of flooding; recent tests have shown
that at least 25 percent and preferably 50 percent of the flotation
material in a boat should be located along the gunwales. FIG. 1(c)
shows device 1 used in the manner of an underwater jack for lifting
and freeing a boat that has run onto a sandbar; several units of
device 1 can be connected end to end as shown by means of strap 4
and fastener 8 together with couplings 5, used to interconnect all
of the gas fill lines in series so that all units may be inflated
from a common source on the deck of the boat, if desired; rope 6 is
connected to the end units for ease in adjusting the position of
devices 1 from the deck. FIG. 1(d) illustrates how device 1 can be
used as a spar buoy for purposes of mooring or marking the location
of a submerged object. FIG. 1(e) shows how device 1 may be strapped
to a submerged object to provide flotation for recovery by raising
the object to the surface; the inflatable member 2 is sufficiently
strong that it can be inflated to a pressure of at least 5 psig, as
required if device 1 is to ascend to the surface from a depth of at
least 10 feet. FIG. 1(f) shows device 1 used in multiple numbers,
the units being fastened together in parallel, such as by
length-wise zippers on each edge, to form a mattress or raft.
Numerous other uses can be found for device 1, both in and around
the water because of its simplicity and adaptability for general
use as a flotation device, being durably constructed in the form of
a band or strap of almost any desired length, equipped with a
tension or load carrying member, connectors at either end for
transmitting the load to other attachments, connectors at either
end for supplying gas to the inflatable member, an inflatable
member having adjustable shape, and a protective casing into which
the inflatable member can be easily and quickly folded after
use.
Referring to drawing FIG. 2(a), 2(b) and 2(c), device 1 consists of
one or more inflatable flotation members 2 and, additionally may
have fixed flotation incorporated as part of casing 3. Casing 3 may
be rectangular in cross-section as shown in FIG. 2(d) or
alternately may have a tubular cross-section or other shape, and
said casing completely encloses and protects flotation members 2
when packed for normal wear or storage. Tension member 4, which may
be a strap of woven plastic, such as Nylon or similar high-strength
material, capable of carrying large tensile loads, is permanently
affixed to casing 3 over its entire length; strap 4 may be molded
integrally with casing 3 or attached externally, such as is shown
in FIG. 2(d). At either end of strap 4 there are buckles, clasps or
other fasteners 8 for use in releasably connecting strap 4 to
another device 1, a mounting fixture, a rope or to itself, as
previously illustrated to form a loop or collar. At either end of
casing 3 various gas fittings may be attached, as indicated by
numeral 5, such as a snap coupling, a plug, a CO.sub.2 gas
cartridge for purposes of inflating flotation member 2. Casing 3 is
restrained from opening at the ends of or between flotation members
2 by means of zippers or tape or other suitable closure devices in
order to retain flotation member 2 in position and properly
contained within protective casing 3. The spacing of flotation
members 2, their length and size, as well as the location and
length of closure devices 7 can be varied to suit the intended use;
as for example, in the case of a life jacket, it may be desired to
increase the spacing between flotation members 2 and to reduce the
diameter of the inflated portion that fits behind the neck when
device 1 is to be worn as a collar or yoke as in FIG. 1(a) in order
to have a comfortable fit. How such adjustment is achieved will be
described later in further detail.
FIGS. 2(d) and 2(e) further explain the construction and use of
flotation member 2, which consists of bladder 9 enclosed within
flexible restraining member or enclosure 10. Enclosure 10 may be an
open-mesh scrim material, such as Nylon or fiberglass screen, or
may be a perforated material, such as vinyl plastic reinforced with
Nylon. This method of construction has been found to be very strong
and durable in larger underwater lift recovery devices. Bladder 9
can be made of thin plastic film material, such as polyethylene or
polyester, and being larger in size than enclosure 10 it is free to
adjust its position without being subjected to strain. The
perforations or open-mesh in enclosure 10 permit free exchange of
air and water between bladder 9 and enclosure 10, further insuring
free movement of bladder 9. Other types of inflatables, such as
rubber or vinyl tubes or spheres, used without enclosure 10 tend to
fatigue and develop weak spots when reused, especially if
restrained by external forces during expansion or use. When bladder
9 is inflated, it will emerge from casing 3 along with enclosure 10
until restrained from further expansion by enclosure 10. Since
bladder 9 is larger in volume than enclosure 10, the latter member
absorbs the gas expansion forces and permits the use of gas
pressures that are substantially greater than can be used with
other types of inflatable devices, such as those using expandable
materials, e.g., a rubber bladder, thereby permitting use of
inflatable device 1 at depth.
Referring now to FIG. 2(a) and 2(d), it can be seen that casing 3,
which may be round or rectangular or other shape in cross-section,
completely encloses bladder 9 and enclosure 10 when device 1 is
deflated. The opening in casing 3 where bladder 9 and enclosure 10
emerge consists of two overlapping flaps 12 that extend the entire
length of casing 3. Flaps 12 may be releasably fastened together,
as indicated at k, along the entire length of casing 3 or held
closed at certain locations along the length of casing 3 by
suitable closure means such as tape 7. When device 1 is inflated,
flaps 12 open as shown in FIG. 2(e) and form a protective shield
for enclosure 10 and bladder 9. Enclosure 10 preferably is
permanently attached to casing 3 along its entire length at one
edge, as indicated in FIG. 2(d) at seam h, and is further retained
within casing 3 by means of closures 7. Further, it is possible to
change the shape of flotation member 2 by shifting the point of
attachment for the releasable side of enclosure 10 as illustrated
by reference to FIGS. 2(e) and 3 which are cross-section views of
FIG. 2(a). In FIG. 2(e), point b represents the location of seam
b--b' where enclosure 10 is permanently attached to casing 3; point
a represents seam a--a' where the edge of enclosure 10 is
releasably attached to casing 3 by means of a plastic zipper or
other closure means; point c represents seams c--c' which may
remain open as shown in FIG. 2(e) or closed as shown in FIG. 3 by
releasable attachment to casing 3 by means of a plastic zipper or
other suitable closure at point a. When point c is secured at point
a, the unused portion of enclosure 10 folds inside the base of
casing 3 as shown in FIG. 3. Thus, by proper location of said
closure devices, it is seen that the user can alter the location
and amount of buoyancy derived from flotation device 2.
The construction of bladder 9 is illustrated by FIG. 2(f) and 2(g).
Bladder 9 is shown in both inflated and folded condition with a
longitudinal heat-sealed seam. Alternately, bladder 9 can be made
from an extruded sleeve or cylinder of plastic tubing, such as the
polyethylene materials that are made as food wrappers. The ends of
bladder 9 are sealed to fill tubes 11 by heat sealing methods or by
seams of monofilament Nylon string 13; metal tube insert 14 is used
where the latter method is employed and is also helpful for
attaching to adjacent fill tubes. Fill tubes 11 are made from
flexible plastic tubing, such as vinyl plastic, and are extended
well inside of bladder 9 to insure that the flow of gas into or out
of bladder 9 is not impeded by folds in the bladder material.
Bladder 9 can be folded simply by pulling simultaneously on
opposite ends of bladder 9 with one or both of the fill tubes 11
open to the atmosphere. When bladder film material is less than
about 1.5 mils thick, bladder 9 folds itself in a small compact
package without using special construction for folding. For thicker
materials, bladder 9 may be constructed from a sheet folded in
narrow strips, in the manner of a fan, with each fold being bonded
at both ends to the adjacent fold, the center fold being left
unbonded to permit entry of fill tube 11 and the final closure
being made to the longitudinal seam as illustrated in FIG. 2(g).
Use of the fan-fold construction will provide a compact
self-folding bladder 9 that will fold easily inside enclosure 10
when simply stretched in the longitudinal direction. Enclosure 10
may be constructed and folded in a similar manner, depending on
material thickness.
Device 1 may be inflated through fill tubes 11 by mouth, by
hand-operated air bellows, by motor driven pump, by compressed gas,
such as a CO.sub.2 cartridge or by means of a chemical gas
generator. The gas cartridges may be operated manually or
automatically upon contact with water and, being located at either
or both ends of device 1, can be mounted inside of casing 3 to
prevent accidental activation.
* * * * *