U.S. patent number 3,724,473 [Application Number 05/186,684] was granted by the patent office on 1973-04-03 for air-drop folding portable shelter.
Invention is credited to Charles W. Moss.
United States Patent |
3,724,473 |
Moss |
April 3, 1973 |
AIR-DROP FOLDING PORTABLE SHELTER
Abstract
A folding portable shelter which when dropped from an aircraft
automatically opens into its erected configuration, locks itself
into the erected configuration, and then functions as a parachute
to deliver a payload to the ground. The shelter has a ventilating
opening in its top, a doorway with a canopy extending from it, and
internal partitions. Also, a plurality of the shelters can be
joined at their doorways and their bases to form a modular complex
shelter.
Inventors: |
Moss; Charles W. (Ann Arbor,
MI) |
Family
ID: |
22685897 |
Appl.
No.: |
05/186,684 |
Filed: |
October 5, 1971 |
Current U.S.
Class: |
135/97; D25/21;
135/94; 135/100; 244/142; D25/32; 135/98; 135/905; 135/126 |
Current CPC
Class: |
E04H
15/28 (20130101); B64D 17/00 (20130101); Y10S
135/905 (20130101) |
Current International
Class: |
E04H
15/28 (20060101); E04H 15/00 (20060101); B64D
17/00 (20060101); A45f 001/00 (); A45f
001/16 () |
Field of
Search: |
;135/1R,2,4R,5E,8
;244/142,145 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Caun; Peter M.
Claims
It is claimed:
1. A fold portable shelter adapted to be erected as an incident to
an airdrop from an aircraft, comprising a flexible cover conforming
generally to the shape of a parachute, shroud lines operatively
connected at one of their ends to the lower peripheral edge of the
cover and commonly connected at their other ends so as to form with
the cover a parachute-like structure, a flexible frame operatively
attached to said cover and responsive to distending of said cover
into the shape of a parachute to flex into an open shape conforming
to the shape of the distended cover, said frame including
self-locking means to lock the frame in said open shape when flexed
open so that when airdropped the shelter can land in an erected
state.
2. A folding portable shelter as defined in claim 1, wherein said
flexible frame includes a central hub, a plurality of flexible ribs
having their top end portions pivotally mounted on said hub and
adapted to flex into archate shape, said flexible cover being
disposed in flexing-restraining and flexing-producing engagement
with said ribs and having a hole concentric with said hub.
3. A folding portable shelter as defined in claim 2, wherein said
self-locking means is a structural, essentially conical shaped
pinnacle positioned above said hub and having a base area capable
of covering said hold and structurally interconnecting said hub and
said flexible ribs so that said flexible ribs are held in
distensible engagement with said flexible cover by said conical
pinnacle.
4. A folding portable shelter as defined in claim 3, wherein said
conical pinnacle comprises an outer conical cover of flexible
material secured at a line defined by the base of said conical
pinnacle to said flexible rib at a point below said top end portion
of said flexible ribs, and a shaft member positioned along a line
defined by the axis of said conical pinnacle engaging said outer
conical cover at its upper end to form an apex and having spring
clamp means at its lower end with said hub slidably mounted
therebetween, said hub being capable of engagement by said spring
clamp means when said flexible ribs are distended and arcuately
shaped in response to higher air pressure on the inside of said
shelter and when said conical cover is under tension from higher
air pressure within caused when said shelter is being utilized as a
parachute, and said hub capable of freely sliding upward on said
shaft when said spring clamp means is disengaged and said frame is
folded.
5. A folding portable shelter as defined in claim 4, wherein said
flexible cover has internal partitions comprising essentially
sector shaped pieces of flexible material secured along a line
defined by said arcuate shaped ribs and extending between the plane
defined by the base of said flexible cover and a point near the top
of said flexible cover when said flexible cover is in distended
engagement with said flexible rib.
6. A folding portable shelter as defined in claim 4, wherein said
flexible cover has a doorway means comprising a vertical, arcuately
extending opening in said flexible cover and a canopy of flexible
material attached externally along a line defined by adjacent ribs,
and having supporting rods, each said supporting rod being attached
to one end to the lower end of said adjacent flexible ribs then
extending outward from said flexible cover and upward to form a
peak with said flexible material of said canopy attached along the
extension of said supporting rods.
7. A folding portable shelter comprising a distensible flexible
cover, a supporting frame for said flexible cover including a
central hub, a plurality of flexible ribs having their top end
portions pivotally mounted on said hub and adapted to flex into
arcuate shape, said flexible cover being disposed in
flexing-restraining engagement with said ribs, and a structural,
essentially conical shaped pinnacle positioned above said hub and
structurally interconnecting said hub and said flexible ribs so
that said flexible ribs are held in distensible engagement with
said flexible cover by said conical pinnacle.
8. A folding portable shelter as defined in claim 7, wherein said
conical pinnacle comprises an outer conical cover of flexible
material secured at a line defined by the base of said conical
pinnacle to said flexible ribs at a point below said top end
portion of said flexible ribs, and a shaft member positioned along
a line defined by the axis of said conical pinnacle engaging said
outer conical cover at the upper end of said shaft member to form
the apex of said conical pinnacle and having spring clamp means at
its lower end with said hub slidably mounted on said shaft member
therebetween, said hub capable of being engaged by said spring
clamp means when said flexible ribs are in their distended
engagement with said flexible cover and said hub capable of freely
sliding upward when said spring clamp means is disengaged and said
frame is folded.
9. A folding portable shelter as defined in claim 8, wherein said
flexible cover is provided with a hole smaller than a circle
defined by the base line of said conical pinnacle so that
ventilating air may pass through said hole and then between said
conical pinnacle and said flexible cover along a line defined by
the base of said conical pinnacle.
10. A folding portable shelter as defined in claim 8 wherein said
flexible cover has internal partitions comprising essentially
sector shaped pieces of flexible material secured along a line
defined by said arcuate shaped ribs and extending between the plane
defined by the base of said flexible cover and a point near the top
of said flexible cover when said flexible cover is in distended
engagement with said flexible ribs.
11. A folding portable shelter as defined in claim 8 wherein said
flexible cover has doorway means comprising a vertical, arcuately
extending opening in said hemispheric cover and a canopy of
flexible material attached externally along a line defined by
adjacent flexible ribs, and having supporting rods, each said
supporting rod being attached to one end to the lower end of said
adjacent flexible ribs then extending outward from said flexible
cover and upward to form a peak with said flexible material
attached along the extension of said supporting rods.
12. A portable modular shelter comprising a plurality of folding
individual shelters interconnected, each having a distensible
flexible cover, a supporting frame for said flexible cover
including a central hub, a plurality of flexible ribs having their
top end portions pivotally mounted on said hub and adapted to flex
into arcuate shape, said flexible cover being disposed in
flexing-restraining engagement with said ribs, and a structural,
essentially conical shaped pinnacle positioned above said hub and
structurally interconnecting said hub and said flexible ribs so
that said flexible ribs are held in distensible engagement with
said flexible cover by said conical pinnacle wherein said flexible
cover has door way means comprising a vertical arcuately extending
opening and a canopy of flexible material attached externally along
a line defined by adjacent flexible ribs, and having supporting
rods, each said supporting rods being attached at one end to the
lower end of said adjacent flexible ribs then extending outward and
away from said flexible cover and upward to form a peak with said
flexible material attached along the extension of said supporting
rods so that said canopy extends above and outward from said
opening.
13. A portable modular shelter of claim 12 wherein said individual
shelter are connected together at the peak of said doorway.
14. A portable modular shelter of claim 13 wherein said individual
shelters having said conical pinnacle comprising an outer conical
cover of flexible material secured at a line defining the base of
said conical pinnacle to said flexible ribs at a point below said
top end portion of said flexible ribs, and a shaft member
positioned along a line defining the axis of said conical pinnacle
engaging said outer conical cover at the upper end of said shaft
member to form the apex of said conical pinnacle and having spring
clamp means at its lower end with said hub slidably mounted on said
shaft member therebetween, said hub capable of being engaged by
said spring clamp means when said flexible ribs are in their
distended engagement with said flexible cover and said hub capable
of freely sliding upward when said spring clamp means is disengaged
and said frame is folded.
15. A portable modular shelter of claim 14 wherein each individual
shelter has said flexible cover which has a hole therein smaller
than a circle defined by the base line of said conical pinnacle so
that ventilating air may pass through said hole and then between
conical pinnacle and said flexible cover along said line defined by
the base of said conical pinnacle.
16. A portable modular shelter of claim 14, wherein each individual
shelter has said flexible cover which has internal partitions
comprising essentially sector shaped pieces of flexible material
secured along a line defined by said arcuate shaped ribs and
extending between the plane defined by the base of said flexible
cover and a point near the top of said flexible cover when said
flexible cover is in distended engagement with said flexible ribs.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a portable shelter, which when
dropped from an aircraft, automatically opens and locks into its
erected configuration, and then functions as a parachute to deliver
a payload to the ground. The present invention also relates to the
means for achieving the automatic opening and self-locking features
of the shelter.
In a disaster situation such as an earthquake or flood, the
immediate needs of the population must often be supplied by
aircraft since roads and railroads may have been destroyed.
Shelter, food, and medicine are usually most urgently needed.
Portable shelters such as tents provide the most suitable shelters
in such a situation, but in order to air-drop tents in the pass
they had to be folded and included in the payload of a parachute,
thus taking the place of other items such as food or medicine. The
parachutes used in the past for such airdrops were wasted weight or
at best could be used only as makeshift shelters if suitable
supports were available on the ground.
The present invention overcomes the problems of disaster condition
airdrops. The parachute of the present invention is itself a
self-opening self-locking shelter, which upon reaching the ground
with a payload of food or medicine is in its erected configuration
and ready for immediate use. Thus every ounce of material dropped
as payload including the airdrop shelter-parachute itself.
SUMMARY OF THE INVENTION
The present invention includes a self-erecting, self-locking,
air-drop shelter, which has an outer flexible cover with shroud
lines attached similarly to a parachute and which has a flexible
frame attached to the outer flexible cover to support the flexible
cover in its open configuration. The frame has a conical pinnacle
positioned atop the shelter which locks open in response to air
pressure differential existing during the airdrop and thereby holds
the flexible frame in a distended position to support the outer
flexible cover in its erected configuration. The present invention
also relates to an air-drop shelter having internal partitions,
rooftop ventilation, and canopy covered doorways suitable for
interconnecting several shelters together to form a modular complex
of shelters.
Thus it is among the objects of the present invention to provide a
portable shelter capable of air-dropping and having self-opening
and self-locking features. Other objects of this invention will
appear in the following description and appended claims, reference
being had to the accompanying drawings forming a part of this
specification wherein like reference characters designate
corresponding parts in the several views.
BRIEF DESCRIPTION OF THE DRAWINGS.
FIG. 1 is a side elevational view of the basic shelter which is the
subject of the present invention;
FIG. 2 is a top plan view of the basic shelter;
FIG. 3 is a vertical section of the shelter taken on the line 3--3
of FIG. 2, showing the internal partitions;
FIG. 4 is a schematic illustration of the ventilation system of the
shelter for summer use;
FIG. 5 is a schematic illustration of the ventilation system of the
shelter for winter use;
FIG. 6 is an enlarged side elevational view of a portion of the
shelter's frame including the pinnacle top and self-locking
mechanism;
FIG. 7 is a top plan view of the hub comprising part of the
shelter's frame;
FIG. 8 is an enlarged fragmentary side elevational view of the
self-locking mechanism employed by the shelter's frame;
FIG. 9 is a side elevational view of the shelter with doorways
attached;
FIG. 10 is an enlarged pictorial view of the shelter's doorway,
with portions broken away to show internal details;
FIG. 11 is a top sectional view taken on the line 11-11 of FIG. 9,
showing the shelter with doorways attached;
FIG. 12 is a top schematic view of three shelters joined to form a
modular complex;
FIG. 13 is a side elevational view of the shelter folded and
inserted in a container, shown in broken lines, for storage or
transport; and
FIG. 14 is a sequential pictorial illustration of the shelter being
deployed as a parachute.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Before explaining the present invention in detail, it is to be
understood that the invention is not limited in its application to
the details of construction and arrangement of parts illustrated in
the accompanying drawings, since the invention is capable of other
embodiments and of being practiced or carried out in various ways.
Also, it is to be understood that the phraseology or terminology
employed herein is for the purpose of description and not of
limitation.
Referring now to the drawings, a portable shelter 10, capable of
being used as a parachute to air-drop a payload for an emergency
airlift, for example, has flexible cover 12 such as canvas
distensibly supported by a folding flexible frame 14 shown in FIG.
3. The frame comprises a plurality of flexible ribs 16 made of any
suitable flexible material such as fiberglass or metal. The ribs 16
are inserted into tunnels 18 formed in the flexible cover 12, as
shown in FIGS. 1 and 2 and as shown enlarged in FIG. 10, and are
connected to the flexible cover 12 at their lower ends by any
suitable means to insure that the flexible cover 12 does not ride
up the ribs 16 when the shelter is in its erected configuration.
The ribs 16 are pivotally interconnected to each other at their top
ends by means of a hub 20 with engaging pins 22 as shown in FIGS. 7
and 8.
With reference to FIGS. 1 and 6, a conical shaped pinnacle 24
comprising part of the frame 14 and having an outer conical cover
26 of flexible material similar to the flexible cover 12 and a
shaft 28 extending downward along the axis of the conical pinnacle
24, is mounted atop the shelter and serves to hold the flexible
ribs 16 in a flexed arcuate shaped when the shelter is erected. As
shown by the solid lines in FIG. 6, this flexing function is
accomplished when the hub 20 which is slidably mounted on shaft 28
is secured in its lowest position on the shaft 28 by a spring clamp
30 which engages a shoulder 32 of the hub 20. FIG. 8 provides an
enlarged view of the hub 20 engaged by the spring clamp 30.
Referring again to FIG. 6, the ribs 16 are thus flexed by the
action of the conical cover 26, attached to the ribs 16 via the
tunnel 18 at points 33 which creates an upward tension on the ribs
16 while the shaft 28 with the hub 20 in its lowest position,
forces the hub 20 downward to create a bowing action in the ribs 16
which are constrained by the shape of the cover 12.
The broken lines in FIG. 6 show the pinnacle's configuration when
the shelter 10 is folded for storage. The hub 20', after being
manually disengaged spring clamp 30, can freely slide upward along
shaft 28 thus allowing the pinnacle 24' to collapse the ribs 16' to
fold inwardly as a result.
When the shelter 10 is airdropped, shown sequentially in FIG. 14,
shroud lines 34 are suitably attached to the flexible cover 12 at
points 36. In FIG. 10, one of the points 36 is shown enlarged. The
point 36 is defined by the intersection of the lower end of rib 16
and the flexible cover 12. A tab 38 is provided on the flexible
cover 12 at each of the points 36 for attachment of the shroud
lines 34 and for staking the shelter 10 down when it is erected and
sitting on the ground. A payload 40 is connected to the shroud
lines 34 at their common point. When the shelter 10 and attached
payload 40 are dropped from an aircraft, the shelter 10 functions
as a parachute as shown sequentially in FIG. 14 to deliver the
payload 40 to the ground. Once on the ground the shelter 10 remains
locked in its distended erected configuration as seen in the last
step of FIG. 14. The distending of the shelter 10 during an airdrop
is caused by two coacting phenomenon. First, air rushing under the
flexible cover 12 causes it to balloon slightly as indicated in
FIG. 14, step 2. Secondly, and with reference to FIGS. 3 and 6
again, air also rushes through a hole 42 in the flexible cover 12
situated beneath the pinnacle 24. The hole 42 is formed because the
flexible cover 12 with its tunnels 18 does not extend to enclose
the hub 20. The air thus introduced into the pinnacle 24' through
hole 42 causes the pinnacle 24' to balloon into the shape of
pinnacle 24. As the pinnacle 24' balloons in response to the air
pressure the hub 20' slides downward on shaft 28 and is locked in
place by spring clamp 30. Once the hub 20 is locked the ribs 16 are
bowed and the shelter 10 is fully distended to conform to the shape
of flexible cover 12 as shown in step 3 of FIG. 14. When the
shelter 10 reaches the ground,the frame 14 stays locked open by
means of spring clamp 30, and the shelter remains distended and
erect as the last step illustrated in FIG. 14.
When not in use the shelter 10 can be folded as shown in FIG. 13
and inserted in a cylindrical container 42, shown in broken
outline, for storage and transport.
Once the shelter 10 has been airdropped and on the ground, its
construction provides several advantages. The hole 42 between the
flexible cover 12 and the pinnacle 24, which allows air to pass
into the pinnacle 24 during descent, serves as a rooftop
ventilator. Referring to FIG. 4, airflow through the shelter 10 is
diagrammed for summer use with an external heat source 44. In
addition to hole 42, there is a gap 46 between the conical cover 26
of the pinnacle 24 and the flexible cover 12. The gap 46 results
because the conical cover 26 is only attached to the flexible cover
12 at discreet points 33 corresponding to the intersection of the
conical cover 26 and the tunnels 18 of the flexible cover 12, and
seen in FIGS. 1 and 2. Due to the external heat source 44 the
outside of the flexible cover 12 is heated initially and the hot
air rises along it as shown. The air next to the cover 12 inside
the tent heats and also rises along the concave wall 48 thus
setting up a counterclockwise rotary flow of air. The rotary flow
pulls cool air present within a low pressure cone 50 formed above
the tent into the shelter 10 through gap 46, and simultaneously air
escapes at the bottom to provide the desired ventilation.
With reference to FIG. 5, circulation of air for winter use with
internal heat source 52 is diagrammed. The air inside the shelter
10 is heated by the heat source 52 and rises toward the pinnacle
24. At the same time, cool air along the flexible cover 12 sinks to
replace the warm air and clockwise circulation as shown begins.
Because of the circulation,the warm air tends to proceed toward the
flexible cover 12 where it is cooled and recirculated. As some
heated air escapes at the gap 46, more cool air flows into the
shelter 10 at the bottom to insure continuous ventilation.
Referring to FIGS. 9-11, the shelter 10 also may be equipped with a
doorway 54 comprising a closable vertical slit or opening 56 in a
section of the flexible cover 12 and a canopy 58. The canopy is
made of flexible material similar to the flexible cover 12 and is
attached to the shelter 10 along two lines 60 each defined by the
tunnels 18 within the flexible cover 12. Attachment of the canopy
58 to the flexible cover 12 can be permanent by stitching directly
along the tunnel 18, for example, or temporarily for removal during
airdrop by means of a zipper along the tunnel 18. Supporting rods
62 are inserted into channels 64 of the canopy 58 and are supported
by the flexible ribs 16 at point 36 by suitable supporting
attachment means. The rods 62 extend upward and outward to form a
peak 66. The peak 66 thus formed extends beyond the base of the
shelter 10 as seen in FIG. 11 and protects the slit 56 from rain or
snow.
Internal partition 68 and 70 in FIG. 3 comprise another
advantageous feature of the shelter 10 and can be either
temporarily or permanently attached to the flexible cover 12 along
any internal line 71 defined by the rib 16 contacting the flexible
cover 12. The partitions can be arranged or other similar
partitions added to adapt the shelter most advantageously to its
intended use.
With reference to FIG. 12, three shelters 70, 72 and 74, each
similar to shelter 10 have doorways 76 and 78, 80 and 82, 84 and
86, respectively are interconnected to form a modular complex
structure 87. The three shelters 70, 72 and 74 are joined along
common sides of their bases at lines 88 and 90, and the doorways
78, 82 and 84 are joined at a common point 92. The three shelters
70, 72 and 74 thus form modular complex 87 which could be used for
issuing clothing to refugees, for example, with a line of people
forming at doorway 76, moving past station 96, through doorways 78
and 84, around stations 98 and 100, and out doorway 86. Shelter 72
could be used for storage. Other complexes could be configured to
provide field hospitals, mess halls, command posts, and so forth
using different numbers of shelters and internal partitions.
* * * * *