U.S. patent number 3,662,932 [Application Number 05/041,964] was granted by the patent office on 1972-05-16 for pack convertible to stool.
Invention is credited to Ralph C. Kerschner.
United States Patent |
3,662,932 |
Kerschner |
May 16, 1972 |
PACK CONVERTIBLE TO STOOL
Abstract
A back-carried pack convertible into a four-legged stool
includes a nonrigid sack element supported by a rigid frame. A
cushioned surface is disposed on one side of the pack unit. Stool
leg members are detachably mounted on opposed sides of the pack
unit and are secured by fastening elements that also serve to
secure the legs to the frame when the legs are in an extended
position.
Inventors: |
Kerschner; Ralph C.
(Mohrsville, PA) |
Family
ID: |
21919300 |
Appl.
No.: |
05/041,964 |
Filed: |
June 1, 1970 |
Current U.S.
Class: |
224/155;
297/17 |
Current CPC
Class: |
A45F
4/02 (20130101) |
Current International
Class: |
A45F
4/02 (20060101); A45F 4/00 (20060101); A45f
004/02 () |
Field of
Search: |
;224/9,46R,46T
;108/33,156 ;248/151 ;297/17,129 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Sheridan; Robert G.
Claims
I claim:
1. A back pack convertible to a stool comprising,
a pack unit forming a hollow, rigid, generally rectangular
enclosure having a front surface and a rear surface and two opposed
side surfaces;
a plurality of leg members;
fastening elements disposed in aligned pairs on each opposed side
surface of the pack unit; and
each leg member including means for alternately engaging a first
aligned pair of the fastening elements when a leg is disposed
parallel to a first edge of a side surface and a second pair of the
fastening elements when the leg is disposed parallel to an edge of
the side surface which is substantially orthogonal to the first
edge.
2. A back pack according to claim 1 wherein the rear surface
constitutes a seating surface.
3. A back pack according to claim 2 wherein the seat surface
comprises a first substantially rigid layer, an intermediate layer
of cushioning material disposed on the rigid layer, and an outer
sheet of flexible material covering the intermediate layer.
4. A back pack according to claim 3 wherein at least one slinging
strap is affixed to the pack unit adjacent the seating surface.
5. A back pack according to claim 1 wherein the means for engaging
the pairs of fastening elements are a plurality of spaced slots
disposed on each leg member.
6. A back pack according to claim 5 wherein each leg member
includes three slots.
7. A back pack according to claim 1 wherein the first and second
pairs of fastening elements have at least one fastening element
common to both pairs.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a hunter's or woodsman's pack that can be
converted to a camp stool.
2. Description of the Prior Art
It has been common, from the earliest days of recorded history, for
persons traveling a distance from the environs of their homes to
employ sacks, usually of a type carried on the back, to carry items
needed on the journey. Today, there has been an increase in the
amount of leisure time available to people and there has been a
gradual reawakening to the natural beauties to be experienced when
visiting wildlands and forests which have been undisturbed by man.
These latter two factors have served to create a market for camping
supplies and equipment which give to the hunter or hiker a modicum
of comfort on his forays into uninhabited parks, forests and
wildlands. The primary desirable attributes of such equipment are
that it be light in weight so as not to unduly tire the camper who
must carry such equipment, that it be comfortable to carry, that it
be of simple and rugged construction so as not to break down in use
and not to be subject to malfunctioning under adverse weather
conditions. Additionally it is desirable that such equipment have
multiple utility so as to reduce the amount of equipment that must
be carried. Of particular use while camping or hunting is a stool.
While one might think that seating surfaces are readily available
in the wilds by reason of fallen trees and rocks, such surfaces are
somewhat generally less than desirable as they are often damp,
roughsurfaced, or are not situated in the best location. Therefore,
it has become highly desirable for outdoorsmen such as campers and
hunters to have a stool with them.
Prior to this time, several efforts have been made at providing a
pack structure which is alternately usable as a pack to carry items
or as a stool. These efforts have generally involved the use of a
lightweight frame which is comprised of at least two elements which
are suitably pivoted together so as to be collapsible when used in
the pack mode. This type of pack structure has several drawbacks
which result from the use of pivot structures to hinge the various
elements together. When employing pivot structure, it is necessary
to provide additional means for securing or locking the elements in
relation to one another, particularly when the pack-stool unit is
used in the stool mode. Further, such pivot structures are
generally weak and unstable and are subject to wear or binding when
exposed to such common outdoor environmental conditions as
moisture, dirt and dust. This tends to make such units more
difficult to set up, particularly when the user is wearing gloves
as in cold weather, and seriously shortens their service life.
Also, such units are not comfortable, especially for long periods
of time, since the rigid frame structures in many instances bear
directly on the back of the wearer.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a unit capable of
being used as a pack and as a stool.
It is another object of this invention to provide a convertible
pack-stool structure which is light in weight, rugged, easy to use,
and of simple construction.
It is another object of this invention to provide a convertible
pack-stool structure which is economical to manufacture.
It is a further object of this invention to provide a convertible
pack-stool structure which is comfortable to carry, especially for
long periods of time.
These and other objects are accomplished by incorporating a rigid,
lightweight frame, of sufficient strength to support a camper,
within a conventional sack. The frame-sack unit, has disposed on
one side thereof a cushioned seating surface. Detachable legs are
alternately positionable on the exterior of the sack-frame unit to
support the unit with the cushioned surface upward, or to be
carried on the sides of the sack-frame unit when it is being
carried by the user.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the convertible pack-stool unit of
the invention in the pack mode.
FIG. 2 is a perspective view of the pack-stool unit of the
invention in the stool mode.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1, the pack-stool unit 1 is shown assembled for use as a
pack. The unit is comprised of a rigid frame 2 composed of four
transverse members 2a, four side members 2b, and four upright
members 2c. The like designated frame elements are of generally the
same length and in the preferred embodiment are assembled so that
the three intersecting elements at each corner are mutually
orthogonal, thereby forming rectangular surfaces F, T, R, B,
S.sub.1 and S.sub.2. The frame elements 2a through 2c in the
preferred embodiment are constructed of aluminum angle stock of
suitable strength. The frame elements are joined together,
preferably by welding, although riveting or bolting procedures
could equally well be employed.
The rigid frame 2 is disposed within a conventional sack 3 which is
commonly made of canvas, heavy duck, or other weather-impervious
materials. The sack 3 is fastened to the frame 2, preferably by
means of rivets (not shown). The knapsack 3 includes a flap 5 for
closing the opening in the top T of the sack and a fastening means
6 for securing the flap 5 closed while the sack is being carried.
The fastening means can, of course, consist of such conventional
means as ties, buckles or snaps. The knapsack also has attached
thereto carrying straps 7 for slinging the sack on the back of the
wearer.
The pack unit includes four leg members 8 which can readily be made
from the same aluminum angle stock as the frame elements of frame
2. Each of the leg members 8 includes a foot portion 9 which is
most suitably formed by bending an end portion of the leg at a
90.degree. angle to the remaining portion. The foot portion is
designed to increase the bearing area of the leg to lessen the
likelihood that the leg will sink into soft earth or similar
supporting surfaces.
Each leg member 8 includes three slots 10a, 10b and 10c disposed in
one web of the leg. The slots are angularly disposed with respect
to the longitudinal axis of the leg. This is done to facilitate
assembly of the legs to the pack-frame unit and to aid in retaining
the legs to the unit, particularly when used in the stool mode.
Threadedly received at each of the four corners of the opposed side
surfaces S.sub.1 and S.sub.2 of the pack unit are screw threaded
fasteners 11. The fasteners 11 have a knurled head to facilitate
turning and tightening and are preferably made of nonrusting metals
such as brass or aluminum or polymeric materials such as nylon.
Preferably, means are employed for preventing the complete
withdrawal of the fasteners 11 from the pack unit as by peening the
threads at the ends of the fasteners or by providing a backing nut
or other enlargement thereat. The fasteners 11 serve to hold the
leg members to the sack-frame unit when it is used either in the
pack mode or in the stool mode. To accomplish this, the slots 10a,
10b and 10c on the leg members 8 are so disposed that the distance
between slots 10a and 10c is equal to the distance between the
fastening members 11 disposed on upwardly directed frame members
2c, and the distance between slots 10b and 10c is equal to the
spacing between fastener elements 11 measured along a line parallel
to frame elements 2b.
As shown in FIG. 2, a cushioning element 12 is attached to the side
of the pack unit opposite to the flap 5 and securing means 6. The
cushioning element 12 may include a rigid sheet 14 of plywood or
the like, a cushioning layer 15 such as an elastomeric foam or the
like, and a covering material 16 of leather, synthetic plastic
material, or other similar material. The cushioning element 12 is
attached to the pack unit by any suitable means as, for example,
blind threaded fasteners or adhesives.
Lashing elements such as conventional D-rings 17 are affixed to the
pack-stool unit at various points and are used for lashing various
items to the pack-stool unit.
In operation, the pack-stool unit is utilized in a pack mode in the
configuration shown in FIG. 1. The pack-stool unit is slung on the
back of the user and secured thereon by means of straps 7. It will
be noted that the cushion structure 12 on side R will be disposed
in engaging relationship with the back of the user and will serve
to comfortably cushion the unit thereon. While the device is used
in this mode, the leg elements are carried on the edges of opposed
side edges S.sub.1 and S.sub.2 by means of fasteners 11 engaging
slots 10a and 10c as shown in FIG. 1. When assembled in this mode,
it can be seen that the pack structure is compact and has no
projections likely to catch on trees or underbrush.
When used in the seat mode, the legs are demounted from the pack
unit by loosening fasteners 11 and the pack-frame unit is oriented
with the seat cushion facing upwardly. The legs are remounted on
the pack seat unit as shown in FIG. 2 with the fasteners 11
engaging slots 10b and 10c. It can be seen that this construction
affords a rigid, stable seat structure.
It can be seen, of course, that the preferred embodiment is capable
of many modifications which remain within the scope of the
disclosed invention. For instance, the open areas on each side of
the frame structure could be closed by affixing a sheet of
material, either flexible or rigid, between the opposed frame
members. For heavy duty applications, the frame elements and legs
could be made from steel, or, for lighter duty applications, from
wood.
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