U.S. patent number 3,846,855 [Application Number 05/333,468] was granted by the patent office on 1974-11-12 for convertible backpack and cot apparatus.
Invention is credited to Charles J. Peterson.
United States Patent |
3,846,855 |
Peterson |
November 12, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
CONVERTIBLE BACKPACK AND COT APPARATUS
Abstract
A convertible backpack and cot apparatus includes an extensible
unitary frame which in its contracted condition is of a convenient
size to carry on the back of a user and in its extended condition
forms the peripheral framework of a cot and includes legs for
retaining the peripheral framework elevated from the ground. The
frame is composed of telescoping side and end portions so that the
frame can be extended both in a lateral and longitudinal direction.
Each end portion carries a supporting leg that is rotatable between
fixed positions so that the leg can also serve as a support for a
bedroll or the like or as an attachment bar for shoulder straps
when the apparatus is used as a backpack. A center leg
interconnects the side portions of the frame and is extensible
laterally of the apparatus to provide an intermediate support when
the apparatus is used as a cot. The frame is adapted to carry a
conventional knapsack, and a cot sheet is connected along its
periphery to the frame so as to be stretched taught when the frame
is extended.
Inventors: |
Peterson; Charles J. (Lakewood,
CO) |
Family
ID: |
23302926 |
Appl.
No.: |
05/333,468 |
Filed: |
February 20, 1973 |
Current U.S.
Class: |
5/114; 224/156;
226/9; 5/11 |
Current CPC
Class: |
A45F
4/06 (20130101); A47C 17/64 (20130101) |
Current International
Class: |
A45F
4/00 (20060101); A47C 17/00 (20060101); A45F
4/06 (20060101); A47C 17/64 (20060101); A45f
001/00 (); E04b 001/347 () |
Field of
Search: |
;224/9,25A
;5/82,110,111-114 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Nunberg; Casmir A.
Attorney, Agent or Firm: Burton, Crandell & Polumbus
Claims
What is claimed is:
1. A convertible packpack and cot apparatus comprising:
a substantially rectangularly shaped frame having a pair of end
members, a pair of side members, and first and second pairs of
elbow members forming the corners of said frame, each of said elbow
members being telescopically connected to one of said end members
and one of said side members to define an adjustable extension of
the associated end member and side member, at least one of the end
frame members being rotatable relative to the associated elbow
members telescopically connected therewith, and releasable lock
means operably interconnecting said end frame member and the
associated elbow members for securing the said end frame member
relative to the associated elbow members in a selected angularly
related position,
leg members connected to said end members and rotatable relative to
said elbow members along with the end members so that said leg
members can be positioned to elevate said frame from a supporting
surface, and
a cot sheet attached to said frame along the periphery of the
frame.
2. The convertible packpack and cot apparatus of claim 2, wherein
said leg members operably connected to said end members comprise
rigid extensions away from said end members to provide rigid
supports for said frame.
3. The convertible backpack and cot apparatus of claim 2, wherein
said elbow members are slidably received within said end frame
members and wherein each of said leg members associated with the
end members comprises a U-shaped normal projections away from the
associated end member.
4. The convertible backpack and cot apparatus of claim 2 further
including a leg member operably connected to said side frame
members which includes a pair of L-shaped elements, each L-shaped
element having a first leg extending normally away from an
associated side frame member and a second leg extending normally
away from the first leg in a general direction toward the opposite
side frame member, said second leg of one L-shaped element
telescopically mating with the second leg of the other L-shaped
element whereby the leg member associated with the side frame
members is extensible transversely of the frame.
5. The convertible backpack and cot apparatus of claim 3 wherein
said elbow members are slidably received within said side frame
members.
6. The convertible packpack and cot apparatus of claim 5 further
including releasable lock means interconnecting the side frame
members and the associated elbow members to retain the respective
members in a selected position.
7. The convertible backpack and cot apparatus of claim 6 wherein
said one end frame member is rotatable about the associated elbow
members between a plurality of fixed positions and wherein said
releasable lock means are operative to prevent relative rotation
between the said one end frame member and the associated elbow
members when the said one end member is in one of the fixed
positions.
8. The convertible backpack and cot apparatus of claim 1 further
including support means operably connected to said frame and
adapted to be passed over the shoulder of a user to support the
apparatus on the user's back.
9. The convertible backpack and cot apparatus of claim 8 wherein
said cot sheet includes a plurality of looped means on its
periphery adapted to receive said frame whereby said cot sheet can
be retained and supported in a taught condition by said frame.
10. A convertible backpack and cot apparatus comprising:
a substantially rectangularly shaped frame having a pair of hollow
cylindrical end members, a pair of hollow cylindrical side members,
said end members and side members having the same inner diameters,
and first and second pairs of identical elbow members having an
outer diameter slightly smaller than the inner diameter of the end
and side members, each elbow member having a short leg and a long
leg, the short leg being received in an end member for relative
axial and rotatable movement and the long leg being received in a
side member for relative axial movement whereby said frame is
expandable and contractible by relative sliding movement of the
elbow members with the end and side members,
a U-shaped end leg member rigidly affixed to each end member so as
to be rotatable with the end member about the short legs of the
associated elbow members,
a U-shaped center leg interconnecting the side members, said center
leg including a pair of L-shaped elements, each L-shaped element
having a first leg extending normally away from an associated side
member and a second leg extending normally away from the first leg
in a general direction toward the opposite side member, said second
leg of one L-shaped element telescopically mating with the second
leg of the other L-shaped element whereby the leg member associated
with the side members is extensible,
releasable lock means interconnecting the side members and the
associated elbow members to retain the side members and elbow
members in selected relative axially spaced positions,
releasable lock means interconnecting the end members and the
associated elbow members to retain the side members and elbow
members in selected relative axially spaced positions and angularly
related positions,
a cot sheet operably attached to said side, end and elbow members
by loop means around the periphery of the cot sheet,
a knapsack releasably connected to the side frame members, and
a pair of shoulder straps, each shoulder strap being connected at
one end to a U-shaped end leg member and at its opposite end to a
side member so as to provide a comfortable means for suspending the
apparatus from the shoulders of a user.
Description
The present invention generally relates to camping equipment and
more particularly to a backpack having a unitary frame that can be
extended to convert the backpack into a cot.
Back-packing has been increasing in popularity and, while it is
conventional to carry a bedroll on the backpack which can be rolled
out onto the ground at night for sleeping, it is highly desirable,
particularly in cold and damp environments, to sleep elevated from
the ground. To this end, several backpacks have been designed so as
to be convertible into cot frames by disassembling the backpack
frame then reassembling the frame with or without the addition of
other frame members to convert the frame into an enlarged cot frame
upon which the backpacker can rest in an elevated prone
position.
Accordingly, it is a primary object of the present invention to
provide a new and improved backpack and cot apparatus which
utilizes a unitary frame of a convenient size to carry on the back
when the apparatus is used as a backpack and which can be quickly
and easily converted into a larger supporting frame for a
comfortable cot.
It is another object of the present invention to provide a
convertible backpack and cot apparatus having a unitary frame which
includes telescoping ends and sides whereby the frame is readily
extensible in both longitudinal and lateral directions for easy
conversion between use as a backpack frame and as a cot frame.
It is another object of the present invention to provide a
convertible backpack and cot apparatus having an extensible frame
with pivotal legs at opposite ends of the frame which are movable
between fixed positions to provide rigid leg supports for the
apparatus when used as a cot and provide desirable supports for
bedrolls, shoulder straps and the like when used as a backpack.
It is another object of the present invention to provide a
convertible backpack and cot apparatus which is extensible from a
size convenient to carry on the back to a size adequate to support
its user in a prone position and which avoids the use of cross
frame members which would cause discomfort to the user when the
apparatus is extended and used as a cot.
The convertible backpack and cot apparatus of the present invention
accomplishes the foregoing and other objects through utilization of
an extensible unitary frame that is quickly and easily converted
between contracted and expanded conditions for use as a backpack
and cot respectively. As will become clear with the detailed
description hereinafter, it is not necessary to disassemble and
assemble the frame when converting it for its several uses, but
merely to slide the frame portions axially of each other in
changing the length and width of the frame. The frame includes
telescoping side and end portions so that the frame is extensible
in both a transverse and longitudinal direction. In the preferred
embodiment, side frame members and end frame members are
interconnected by corner frame members which are telescopically
received in the side and end frame members. Supporting legs are
connected to each of the end frame members and the end frame
members whereby the end legs are movable relative to the corner
frame members between a plurality of fixed positions to prevent
relative rotation between the associated members. In this manner
the supporting legs are also useful when the apparatus is used as a
backpack to support bedrolls, shoulder straps, and the like as will
become more apparent with the detailed description hereinafter. A
center U-shaped leg interconnects the side frame members while
protruding normally away from a plane containing each side member
and has a transversely extending intermediate portion which is
extensible so that the center leg can be elongated transversely of
the frame.
A cot sheet is connected along its periphery to the frame so that
it is automatically drawn taught when the frame is extended and a
knapsack is conveniently releasably connected to the frame for use
when the apparatus is used as a backpack for carrying camping
equipment and the like. Shoulder straps are also releasably
connected between the frame and one of the supporting legs whereby
the apparatus can be comfortably carried on the back of a user when
in its collapsed condition.
Other objects, advantages and features of the present invention
will become more apparent as the description proceeds taken in
conjunction with the accompanying drawings, in which:
FIG. 1 is a perspective view of the backpack and cot apparatus of
the present invention in its contracted condition;
FIG. 1a is an enlarged fragmentary perspective view of a portion of
a side frame member showing the attachment of a knapsack to the
side frame member;
FIG. 2 is a top plan view of the apparatus of FIG. 1;
FIG. 3 is a side elevation of the apparatus of FIG. 1;
FIG. 4 is a perspective view of the backpack and cot apparatus in
its expanded condition;
FIG. 5 is a side elevation of the apparatus of FIG. 4;
FIG. 6 is a top plan view of the apparatus of FIG. 4;
FIG. 7 is an enlarged fragmentary perspective view with parts
broken away showing the interconnection of an end frame member with
an elbow member; and
FIG. 8 is an enlarged fragmentary section taken along line 8--8 of
FIG. 7.
A preferred embodiment of the backpack and cot apparatus 10 of the
present invention is seen in FIGS. 1 through 3 to include an
extensible framework 12 adapted to support a cot sheet 14 and a
conventional knapsack 16 as well as camping accessories such as a
bedroll 18 or the like.
The frame for the backpack and cot apparatus 10 is seen to be
rectangular and includes a pair of identical parallel side frame
members 20, identical parallel head and foot end frame members 22a
and 22b respectively extending in a direction normal to the side
frame members, and two pair of identical L-shaped corner or elbow
members 24 interconnecting the side and end frame members and
defining the corners of the frame. The side frame members 20 are
several times as long as the end frame members 22a and 22b and both
the side and end frame members are hollow cylindrical tubes of the
same diameter with the side frame members having a slight bend at
their longitudinal center so that when the apparatus 10 is used as
a packpack, as shown in FIGS. 1 through 3, it can be carried
comfortably on the back of its user, FIG. 3. The elbow members 24
are also hollow cylindrical tubes but have an outer diameter
slightly less than the inner diameter of the side and end frame
members. Each elbow member 24 has an end leg 26 approximately half
the length of an end frame member 22a or 22b and a side leg 28
approximately half the length of a side frame member 20 with the
end leg 26 being slidably received within an associated end frame
member and the side leg 28 being slidably received within an
associated side frame member. It can, therefore, be seen that the
side, end and elbow frame members cooperate in establishing an
expansible telescopic rectangular framework which is expansible
both longitudinally and transversely.
The head and foot end frame members 22a and 22b respectively each
include an integral U-shaped leg 30 which extends laterally or
radially away from one side of the end frame member. The U-shaped
leg 30 has a pair of side bars 32 each having one end connected to
the end frame member adjacent the ends of the end frame member and
a cross bar 34 interconnecting the opposite ends of the side bars
32. Preferably, the U-shaped leg 30 is formed from a fixed length
of hollow tubing which is appropriately bent to form the side and
cross bars 32 and 34 respectively.
The end frame members 22a and 22b, in addition to being slidably
movable axially of the end leg portions 26 of the associated elbow
members 24, are rotatable about the end leg portion and may be
fixed in any one of a plurality of angularly related positions by a
conventional finger-actuated snap lock mechanism 36 carried within
the end leg of the elbow member 24 and adapted to cooperate with
circular openings 38 in the end frame members 22a and 22b. The snap
lock mechanism 36 is shown in FIGS. 7 and 8 to include a
depressable lock pin 40 having a length slightly shorter than the
internal diameter of the elbow member 24 and which is guided for
axial sliding movement within a cylindrical guide bushing 42
extending diametrically across the interior of the elbow member and
being immovably anchored to the elbow member as by soldering. The
guide bushing 42 has an inturned flange 42a at one end and is
axially aligned with a smaller diameter circular opening 44 in the
elbow member which is slightly larger than the diameter of the lock
pin 40 so that the lock pin is slidable therethrough. The lock pin
has as integral annular shoulder 46, spaced inwardly from the outer
end 48 of the pin, which has a diameter slightly greater than the
opening in the end of the bushing defined by the flange 42a so that
only the portion of the lock pin outwardly of the shoulder is
allowed to pass through the opening 44 in the elbow member. A
compression spring 50 within the guide bushing 42 circumscribes the
lock pin along a portion of its length so as to abut against the
inner surface of the annular shoulder 46 and the inner surface of
the elbow member at the opposite end of the guide bushing. In this
manner, the lock pin is biased in a radial direction urging the
outer end 48 of the pin outwardly through the circular opening 44
in the elbow member and through one of the circular openings 38 in
the associated end frame member 22a or 22b.
It will be appreciated that when the lock pin 40 extends into an
opening 38 in an associated end frame member 22a or 22b, the end
frame member is prevented from rotating about the elbow member 24.
However, by depressing the lock pin so that its outer end 48 is
within the inner diameter of the associated end frame member, the
end frame member can be rotated relative to the end leg portion 26
of the elbow member. For purposes of the present disclosure, three
aligned angularly spaced openings 38 are provided adjacent each end
of the end frame members 22a and 22b and at two spaced locations
near the center of the end members and are situated so that the
U-shaped leg 30 on the end frame member can be advantageously
locked in any one of three distinct angularly related positions
regardless of whether the frame is extended or contracted to serve
various useful purposes. For example, the end frame members 22a and
22b can be locked as shown in FIGS. 7 and 8, so that the associated
leg 30 extends substantially normally away from the plane of the
framework 12 of the apparatus and thereby serves as a support leg
for the framework when the apparatus 10 is used as a cot. The end
frame members 22a and 22b can also be locked in a position, as
shown in FIGS. 1 and 3, so that the associated U-shaped leg 30
extends at approximately a 45.degree. angle to the plane of the
framework 12 of the apparatus so as to retain the bedroll 18 or
other like article between the leg 30 and the framework. In the
third available setting, the U-shaped leg 30 would be locked into
the plane of the framework of the apparatus, extending inwardly
thereof for a purpose to be explained later.
It is to be understood that the end leg 26 of each elbow member 24
is identical and includes an identical snap lock mechanism 36 so
that the U-shaped leg on each of the end frame members is movable
between the three fixed positions. It should also be pointed out
that the snap lock mechanism is disposed so as to be slightly
spaced from the end of the end leg 26 so that the frame is
extensible to a maximum extent without sacrificing strength when
the frame is extended. Since there are two sets of openings 38 on
each end member 22a and 22b which are adapted to cooperate with the
snap lock mechanism on the end leg 26 of each elbow member, it can
be appreciated that the end leg of the elbow member can be
prevented from longitudinal sliding movement within the end frame
members 22a and 22b in either one of two positions. Similarly, each
side frame member has an opening 39 adjacent each end and two
openings 39 near its center, one on either side of the bend, which
cooperate with a snap lock mechanism 36 near the end of the side
leg 28 of each elbow member. The snap lock mechanism 36 on the side
leg of each elbow member is identical to the snap lock on the end
leg; however, since the side frame members do not rotate relative
to the side leg of the associated elbow member, only two openings,
as opposed to two sets of openings, are needed in the side frame
members to cooperate with each side leg of an elbow member in
preventing relative longitudinal sliding movement between the side
legs of the elbow members and the side frame members. Accordingly,
the elbow members in one position are substantially retained within
the side and end frame members, such as when the frame is
contracted, as shown in FIGS. 1 through 3, and in another position
only the terminal ends of the elbow member are retained in the side
and end frame members as when the frame is extended, as shown in
FIGS. 4 through 6.
A center U-shaped leg 52 interconnects the side frame members 20 at
the longitudinal centers thereof and includes two L-shaped hollow
tubular elements 54 and 56 having shorter legs 58 and 60
respectively anchored to an associated side frame member and
extending normally away from the plane of the framework of the
apparatus 10 and longer legs 62 and 64 respectively extending
transversely of the apparatus along a line spaced from the plane of
the framework of the apparatus. The longer legs of the L-shaped
elements are telescopically received in a tubular sleeve 65 of
slightly larger internal diameter than the outer diameter of the
longer legs 62 and 64. Snap lock mechanisms, now shown, identical
to the snap lock mechanisms 36 are incorporated into the ends of
the longer legs 62 and 64 to cooperate with openings 66 in the
sleeve 65 to positively position the elements 54 and 56 when the
frame is in its contracted and expanded positions. It can,
therefore, be appreciated that when the apparatus framework 12 is
expanded or contracted, the center leg 52 can selectively expand or
contract accordingly to conform with the width of the
framework.
Referring again to FIGS. 1 through 3, the knapsack or bag 16 is of
the type conventionally used on backpacks and is releasably
connected in a conventional manner to the side frame members 20 of
the framework by a pull-rod 68 on each side frame member. The
pull-rod 68 is adapted to pass through a plurality of pins 70,
FIGS. 1 and 1a, having radial passages therethrough which are
welded or otherwise anchored to the outer side of each side frame
member 20. The pull-rod is not inserted through the pins 70,
however, until the pins have been inserted through corresponding
eyelets 72 in side flaps 74 along the sides of the knapsack.
Accordingly, the knapsack 16 is easily attached to the framework by
insertion of the pins 70 through the eyelets in the associated side
flaps of the knapsack and inserting the pull-rod through the pins
longitudinally of each frame member to retain the eyelets on the
pins. The knapsack is just as easily removed from the framework by
removing the pull-rod which releases the knapsack from the
framework.
A pair of shoulder straps 76 for comfortably suspending the
apparatus 10 from the shoulders of a user when in the contracted
condition are passed from the cross bar portion 34 of the U-shaped
leg 30 on the head end frame member 22a of the apparatus to the end
of the adjacent side frame member 20 at the opposite end of the
framework. Of course, each end of both shoulder straps 76 is
suitably anchored in any conventional manner at the aforementioned
locations on the apparatus so as to support the weight of the
apparatus and any articles carried thereon. Since the U-shaped leg
30 to which the shoulder straps are attached at the head end of the
framework is somewhat narrower than the width of the framework in
its contracted condition, the upper end of the shoulder straps are
closer together than the lower ends as desired for positive but
comfortable cooperation with the shoulders of a user.
The cot sheet 14 is composed of a light weight flexible material,
such as nylon, having the necessary strength to support the weight
of a user. It consists of a rectangular body 78 having dimensions
approximating that of the framework when the framework is in its
extended condition. The body 78 has a plurality of attached loops
80 along its perimeter which are large enough to pass around either
the side frame members 20 or end frame members 22a and 22b so that
when the framework is contracted and used as a backpack, the loops
80 will fit easily around the side and end frame members with the
body 78 retained in a loose condition within the framework. When
the framework is extended, some of the loops 80 can be slid onto
the elbow members 24 of the framework, as clearly shown in FIGS. 4
and 6, so that the body of the cot sheet is stretched between the
frame members so as to be suitable for comfortably supporting its
user. It is important to note that when the apparatus is extended
and used as a cot, there are no cross bars of the framework which
would be discomforting to a user. The only cross bar that is
located between the ends of the cot is the center leg 52 which
extends downwardly and away from the cot sheet and would
accordingly not be felt by a user.
To make the apparatus 10 more comfortable to carry when used as a
backpack, a cushioning strap 84 is releasably connected to the side
frame members 20 so as to interconnect the side frame members and
be stretched tightly therebetween. The cushioning strap is
conventionally used on backpacks to direct a portion of the weight
of the backpack into the user's lower back immediately above the
pelvic region. Accordingly, the cushioning strap is selectively
positioned along the length of the side frame members at a location
which is best suited for the individual carrying the apparatus.
It can be appreciated from the foregoing description that a
backpack and cot apparatus 10 has been described which is of
convenient and comfortable size to carry on the back when in its
contracted condition and which can be expanded to nearly twice its
length and width to support its user in a prone position elevated
from the ground. It can also be appreciated that when the framework
is made of a light material, such as aluminum or light weight
steel, and with the cot sheet 14 and knapsack 16 made of a light
weight material, such as nylon, that the entire apparatus can be
light enough to comfortably carry on the back of a user and yet
strong enough to support the weight of the user.
By way of illustration and not limitation, it is recommended that
the framework be approximately 14 inches wide and 38 inches long in
its contracted condition so as to fit comfortably on the back of
its user when used as a backpack and so that when it is expanded to
nearly twice its length and width, it will be large enough to
comfortably support a relatively tall individual in a prone
position.
Although the present invention has been described with a certain
degree of particularity, it is understood that the present
disclosure has been made by way of example and that changes in
details of structure may be made without departing from the spirit
thereof.
* * * * *