U.S. patent number 3,840,162 [Application Number 05/307,032] was granted by the patent office on 1974-10-08 for pack frame with rigid link suspension.
This patent grant is currently assigned to Camp Ways Inc.. Invention is credited to Harold S. Horenstein, Allan M. Olson.
United States Patent |
3,840,162 |
Horenstein , et al. |
October 8, 1974 |
PACK FRAME WITH RIGID LINK SUSPENSION
Abstract
A pack frame assembly for carrying a load on a person's back;
the assembly comprising a pack frame; an upper suspension
comprising a pair of shoulder straps attached to the frame; and a
lower suspension on a hip-belt, said lower suspension comprising a
pair of down-hanging rigid links, each with upper pivot attachment
to said belt, and lower pivot attachment at the lower end of said
frame, permitting restricted movement of the frame with each stride
of the carrying person.
Inventors: |
Horenstein; Harold S. (Los
Angeles, CA), Olson; Allan M. (Whittier, CA) |
Assignee: |
Camp Ways Inc. (Los Angeles,
CA)
|
Family
ID: |
23187941 |
Appl.
No.: |
05/307,032 |
Filed: |
November 16, 1972 |
Current U.S.
Class: |
224/262; 224/263;
224/264 |
Current CPC
Class: |
A45F
3/10 (20130101) |
Current International
Class: |
A45F
3/10 (20060101); A45F 3/00 (20060101); A45f
003/10 () |
Field of
Search: |
;224/25A,8R,9,11 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Spar; Robert J.
Assistant Examiner: Forsberg; Jerold M.
Attorney, Agent or Firm: Shanahan; Edmond F.
Claims
I claim:
1. An improved pack frame assembly for movable suspension of a pack
load carried on the back of a walking person, said assembly
comprising:
a pack frame comprising: substantially vertical right and left side
bars disposed behind the shoulders of said person and extending
vertically from the region of the shoulders downwards to the hip
region of said person; a plurality of transverse members between
said side bars, including a lowermost hip-level member, and a
shoulder-level member; and side bar ends projecting downwardly and
rearwardly from said hip-level member;
an upper suspension comprising a pair of shoulder straps for
suspending said pack frame from the shoulders of said person, each
of said straps extending from said shoulder-level member to the
lower outside of one of said side bar ends;
a lower suspension comprising:
a waist belt encircling the waist of said person;
a pair of rigid links, one near each side of said person, for
suspending the lower end of said pack frame from said waist belt,
each of said links being provided with
an upper pivot attachment pivotally attaching the upper end of said
link to said waist belt at one side of said person; and
a lower pivot attachment for pivotally attaching the lower end of
said link to the lower inside surface of the adjacent one of said
side bar ends at an elevation below said waist belt, to permit
restricted swinging of said pack with respect to said person,
during walking.
Description
This invention relates generally to a pack frame assembly, and more
particularly to a rigid link suspension employed in hanging a pack
frame in swinging suspension from a hip-belt.
The sport of back packing has achieved an amazing growth in
popularity in recent years, which has, in turn, produced a great
increase in production of back packs for hikers, and has also
stimulated the development of many improvements in designs of pack
frame assemblies for carrying camping equipment.
Many improved designs have been based on the recent discovery that
the back pack should be allowed to swing, to a restricted degree,
with each stride of the load-carrying person. The hiker can carry
his pack for a longer period of time, with less fatigue and greater
comfort, if the pack frame assembly on his back is freely movable,
within limits, so that his body is not required to jerk the pack
through a series of forceful oscillations corresponding to the
walking rhythm. The slight swings of the pack reduce the pounding
on the hiker's back.
On the other hand, it is important that the swinging movement be
not only restricted, but also adjustable to the peculiar
characteristics of each hiker. Every person has a slightly
different body build, muscle distribution, and stride
characteristic. Even the same person may prefer changing the
adjustment of his pack frame assembly from time to time, in order
to switch the load slightly from one set of muscles to another. In
previously known movable back packs, a crude combination of
restricted movement and adjustability has been achieved by simply
loosening the canvas straps by which it has been customary to tie
the lower end of the pack frame to a padded waist belt encircling
the waist of the load carrying person. Such flexible straps permit
the pack frame to swing in unpredictable manners, not adequately
restricted for the needs of comfort of the wearer. Also,
adjustability has proven unreliable, since a canvas strap may
stretch, or loosen.
The present invention comprises a new form of suspension for
suspending the lower end of the pack frame from the waist belt,
particularly by using a pair of rigid aluminum links pivotally
attached to the waist belt and pack frame at locations which permit
the swinging movement required for comfort, but eliminate the
erratic and unwanted movement permitted by canvas strap
suspension.
The foregoing and other objects of the invention will best be
understood from the following description of a preferred specific
embodiment of the invention, which embodiment is illustrated in the
accompanying drawings in which:
FIG. 1 is a perspective view of a pack frame assembly constructed
according to the invention, and carrying a typical back pack load,
as seen from a location which would be to the right of and in front
of a person carrying the pack of FIG. 1;
FIG. 2 is a fragmentary perspective view of the lower, rear, right
side corner of the pack of FIG. 1, as seen from a location to the
right rear of a person carrying the pack; and
FIG. 3 is an elevational view, partially sectioned, of a rigid link
in the right side of the pack of FIGS. 1 and 2, as viewed in the
direction of the arrows 3--3 in FIG. 2.
In FIG. 1, the numeral 10 is used to indicate the entire pack,
which is comprised of a pack frame assembly, indicated collectively
by the numeral 11, and a pack load indicated by the bag 12 shown
mounted to the rear of the pack frame assembly 11.
The pack frame assembly 11 is comprised of several parts assembled
to a typical metal frame 13, which is best constructed of aluminum
or magnesium tubing. It has been standard practice to hang the pack
frame 13 from the shoulders of the carrying person (not shown in
this illustration) by a pair of shoulder straps 14 and 15, which
are typically provided with rubber or plastic foam padding 14a and
15a on the parts of their links which place the load of pack 10 in
bearing on the shoulders of the carrying person. Another typical
part of the pack frame assembly is the stretched canvas back band
16, which provides a comfortable and yielding contact of the load
pack 10 against the back of the carrying person.
A comparatively recent improvement in pack frame assemblies is the
padded waist belt 17, which is constructed of a belt which may be
belted onto the waist of the carrying person. Typically such a belt
is a construction of canvas webbing straps 17a and suitable padding
17b, in back and side portions of the belt 17 at which the carrying
person feels the load of pack 10. Pack frame 13 may be of a variety
of constructions, including most of those known in the recent past.
In the embodiment illustrated, pack frame 13 includes a right side
bar 21, at the right side rear of the carrying person and a left
side bar 22, at the left side rear of the carrying person.
Generally, these side bars 21 and 22 are not perfectly straight or
perfectly vertical, and are usually slightly contoured in some
manner, such as that illustrated in FIG. 1, to make comfortable
conformation to the back of the carrying person. However, for
convenience, side bars 21 and 22 will be referred to herein as
substantially vertical, and this terminology is intended to include
side bars such as 21 and 22, which depart slightly from the
vertical, and which are slightly contoured or angled at one end or
throughout their lengths.
Typically, the pack frame includes several horizontal bars across
the back of the carrying person. In the illustrated construction,
there is a shoulder-level bar 23, at an elevation slightly below
the shoulders of the carrying person. An intermediate bar 24 is
formed in concave contour to avoid contact with the back of the
carrying person. A bottom hip-level bar 25 is approximately at the
elevation of the lower hips of the carrying person, and is likewise
of a concave contour.
The frame is strengthened by additional intermediate vertical bars
26 and 27, and by reinforcing bars such as 28 and 29.
Side wires 30 are provided as a convenient means for attachment of
bag 12 to the frame 13.
Although shoulder straps 14 and 15 may be attached to frame 13 in a
variety of ways, and may themselves be constructed with various
constructions, in general they provide suspension of all or a
substantial part of the load of pack 10 from the shoulders of the
carrying person.
In packs of the type in which the present invention is employed,
shoulder straps 14 and 15, may be referred to collectively as an
upper suspension, since a second substantial part of the load is
carried by waist belt 17, through a lower suspension employing a
pair of rigid links, comprising right side link 31 and left side
link 32.
The enlarged perspective view of FIG. 2 shows the manner of
assembly of right side link 31 (left side link 32 being attached in
the same manner on the left side of the pack 10). At its upper end,
link 31 is pivotally attached to belt 17 by means of a pivot pin 33
received and anchored in a grommet 34. It will also be seen that
the upper pivot attachment by pivot pin 33 may be shifted to
another side location 35, if that provides a better pack movement
and pack carriage for the particular person wearing pack 10. The
lower end of link 31 is pivotally attached to the lower inside of
substantially vertical side member 21 by means of a lower pivot pin
40, which has a head 41 and a retainer ring 42 for retaining it in
assembly through transverse bore 43 (in side bar 21) and hole 44 in
the lower end of link 31. A second feature of adjustability in the
construction iillustrated is provided by having a plurality of
pivot attachment holes disposed longitudinally of link 31. An
additional pivot attachment hole 45 is illustrated in the lower end
of link 31. It will be seen that this construction permits varying
the swinging links of link 31 between upper pivot attachment 33,
and lower attachment to frame 13 by pin 40.
It is a preferred form of construction to anchor the lower ends of
shoulder straps 14 and 15 at corresponding lower ends of side bars
21 and 22 by the same pivot pin 40, which connects the lower end of
one of the links 31 and 32, link 31 being illustrated in FIGS. 2
and 3. Preferably, washers 47 and 48 are employed to provide an
extended bearing surface on the adjacent parts of shoulder strap 14
and link 31, respectively (left side link 32 having the same kind
of assembly).
Preferably, shoulder straps 14 and 15 have one or more adjustments
which permit shifting the portion of the load carried by upper and
lower suspensions, respectively. A simple form of such
load-shifting adjustment is simply to change the lengths of the
shoulder straps 14 and 15; for example, this may be accomplished by
shortening the straps through buckles 14b and 15b. Shortening or
adjustment may also be accomplished, however, by changing the
location and manner of anchoring of straps 14 and 15 at their upper
ends at 54 and 55, or at their lower ends at 54a and 55a. For
example, the manner of anchoring at points 54, 55, 54a, and 55a may
permit of attachment of the respective straps 14 and 15 at
different points along their lengths to permit shortening or
lengthening of strap distance between the upper and lower anchoring
locations. Also, these anchoring points may be constructed to
provide a plurality of anchoring locations to pack frame 13, or in
various ways well known to those familiar with the art of pack
construction.
* * * * *