U.S. patent number 3,831,827 [Application Number 05/307,033] was granted by the patent office on 1974-08-27 for pack frame with swiveling hip-riders.
This patent grant is currently assigned to Camp Ways Inc.. Invention is credited to Allan M. Olson.
United States Patent |
3,831,827 |
Olson |
August 27, 1974 |
PACK FRAME WITH SWIVELING HIP-RIDERS
Abstract
A pack frame assembly combining a pack frame and a suspension
means which permits a restricted movement of the pack frame as it
is carried on the back of a walking person, which suspension means
includes in combination: a pair of flexible shoulder straps
attached to the pack frame; and right and left swiveling cantilever
arms projecting horizontally from the lower ends of the pack frame
to a hip belt, said cantilever arms being pivotally attached to the
hip belt.
Inventors: |
Olson; Allan M. (Whittier,
CA) |
Assignee: |
Camp Ways Inc. (Los Angeles,
CA)
|
Family
ID: |
23187948 |
Appl.
No.: |
05/307,033 |
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,8A |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
82,261 |
|
Aug 1953 |
|
NO |
|
61,404 |
|
Jun 1940 |
|
NO |
|
75,830 |
|
Oct 1949 |
|
NO |
|
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
frame carried on the back of a walking person, said assembly
comprising:
a pack frame including substantially vertical right and left side
bars disposed behind the right and left sides of the carrying
person, each of said side bars having a lower end projecting
downwardly and bent rearwardly of said person, and cross bars
connecting said side bars;
an upper suspension comprising a pair of shoulder straps for
suspending said pack frame from the shoulders of said person;
a lower suspension comprising:
a waist belt for encircling the waist of said person;
a pair of hip-rider means, one for each of said side bars, each
hip-rider including:
a substantially vertical sleeve rotatably received on said
downwardly projecting lower end;
stop means between said sleeve and said side bar for restricting
the rotation of said sleeve to a predetermined arc;
an arm structure integral with said sleeve and projecting angularly
relative to said lower ends and horizontally forwardly to the
region of the side of said waist belt; and
pivotal attachment means between the forward end of said arm
structure and said belt to permit rotational movement of said arm
about a substantially horizontal axis projecting sidewardly of said
person;
whereby said pack frame is suspended from said person with freedom
to undergo restricted movement with respect to said person during
walking.
Description
The present invention relates to a pack frame of the type used by a
back packer, or a hunter, for carrying his camping or other
equipment on his back. More particularly, the present invention is
a new form of suspension of the pack frame from the back of the
carrying person by a combination of shoulder straps and cantilever
arms projecting from the lower end of the pack frame to a hip belt
worn by the carrying person. The cantilever arms swivel on the pack
frame to permit a predetermined restricted movement about a
substantially vertical axis; the arms are pivoted at the hip belt,
at the sides of the carrying person, to permit restricted movement
about a substantially horizontal axis.
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.
Many expert back packers prefer a pack frame assembly which
includes frame structure connected directly to the sides of the
waist belt. A person carrying such a pack feels the load on the
sides of his hips, rather than as something hanging down behind
him. In the past, a few pack frames have actually been constructed
with solid bar construction which turns forward at the lower end
and attaches to the waist belt. Unfortunately, such a pack frame
mounting precludes the use of the swinging feature, also desirable
to most expert back packers.
The standard construction for back packs usually includes a
horizontal back band of canvas material, usually 4 to 6 inches in
vertical width, which rests the load on the back of the person
carrying the pack. However, it is a feature desired by many expert
backpackers that the pack load be partially distributed to the
waist belt, in addition to the horizontal back band. The only
practical way of achieving this is to have part of the pack frame
construction anchored on the waist belt in a way which spaces the
pack frame back from the body of the person carrying the pack. This
feature has heretofore been considered as inconsistent with any
type of swinging construction. This is particularly true since the
spacing desired by different persons is slightly different.
It is an important object of the present invention to provide
upwardly and forwardly projecting swinging arms on each side of the
lower end of the pack frame, in order to transmit pack load
directly to the pack belt through pack frame structure, while at
the same time permitting the restricted swinging which allows the
pack to move slightly in a rhythmic manner with each stride of the
hiker.
A second important object of the present invention is to provide a
swiveling arm structure which has selective adjustability, so that
a standard pack frame may be adjusted to a suitable mounting
configuration for persons of different builds.
A third important object of the present invention is to provide a
solid swiveling arm structure of the type described in the
following pages, which can be installed as an additional accessory
on most presently known pack frames. Most existing pack frames are
constructed of tubular metal, and have downward projections of
right and left side bars, suitable for mounting of the swiveling
arm structure to be described hereinafter.
The foregoing and other objects and advantages of the invention
will best be understood from the following description of a
preferred specific embodiment, which description should be read
with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a pack constructed according to the
invention, as viewed looking backwards from the right front of a
person (not shown) wearing the pack;
FIG. 2 is an enlarged perspective view of the lower right hand
corner fragment of the pack of FIG. 1, as viewed from the right
rear in the direction indicated by the arrow in FIG. 1; and
FIG. 3 is an elevational view, in cross-section, of the
horizontally swiveling arm structure seen in FIGS. 1 and 2, the
section being taken in the direction of the arrows 3--3 as
indicated in FIG. 2.
In FIG. 1, the numeral 10 is employed to indicate the pack in its
entirety. The pack 10 is mounted on the back of the person carrying
it by means of a pack frame assembly indicated generally by the
numeral 11. The pack load is carried in a pack bag 12 which is
mounted on a pack frame 13 (the principal part of pack frame
assembly 11) by means of suitable attachment wires 12a or any other
means known to those familiar with pack construction.
The pack frame 13 is supported in part, from the shoulders of the
wearer by a pair of shoulder straps, right strap 14 and left strap
15. It is customary to provide shoulder straps 14 and 15 with
shoulder pads 14a and 15a, and to made them adjustable by means of
buckles 14b and 15b.
As in the standard and well known type of construction, the pack
assembly 11 includes a canvas band 16 which provides a comfortable
contact between the pack 10 and the back of the wearer.
The load of pack 10 is also partly supported from a waist belt 17,
which is typically comprised partly of canvas webbing 17a and
partly of a padded construction 17b.
The pack frame assembly 11 is suspended partly from the waist of
the carrying person by means of a pair of swiveling arm structures,
comprised of right swiveling arm structure 21 and left swiveling
arm structure 22, to be described hereinafter in detail.
It will be convenient, hereinafter, to refer to the support of pack
10 on the back of the carrying person as being accomplished by an
upper suspension 23, comprising shoulder straps 14 and 15, and a
lower suspension comprised of the arm structures 21 and 22, and
waist belt 17, referred to collectively as a lower suspension
24.
Frame 13 is illustrated as a typical construction of metal tubes,
usually aluminum or magnesium. Frame 13, in the particular
embodiment, is comprised of a pair of vertically extended side
bars, comprising right side bar 25 and left side bar 26, and a
number of horizontal cross bars running transversely across the
back of the carrying person, and including a pack cross bar 27, a
shoulder level cross bar 28, and a pair of concave contoured lower
bars 29 and 30. The rigidity and strength of frame 13 is augmented
by a pair of light vertical bars 31 and 32.
Shoulder straps 14 and 15 may be attached to frame 13 in a variety
of ways, the upper anchoring points 33 and 34 being somewhat below
the level of the shoulders of the wearer, and the lower anchoring
points 35 and 36 being in the general region of the wearer's
waist.
The total load of pack 10 may be apportioned between the upper
suspension 23 and the lower suspension 24 by adjustment of shoulder
straps 14 and 15.
The new and hitherto unknown construction of arm structures 21 and
22, which provide the most important features of novelty of the
invention, will be described in connection with right arm structure
21, only, since left arm structure 22 is simply a substantially
identical left-hand version. Right arm structure 21 is illustrated
in detail in FIGS. 2 and 3.
It will be seen in FIG. 2 that right side bar 25 has a downwardly
projecting end section 25a (left side bar 26 being similarly
provided with a downward projection 26a). A vertically extended
tubular sleeve 40 is closely received on downward projection 25a
and is rotatable thereon about an axis which may be referred to as
substantially vertical, although it may in fact be bent rearwardly
from the vertical since it is customary to form side bars 25 and 26
to fit the contours of the human body as shown in FIG. 1.
An arm structure 41 is welded integrally to sleeve 40, and swings
therewith. In the assembly 21, arm structure 41 swings horizontally
about the substantially vertical axis, already mentioned, of the
rotation of sleeve 40. In the preferred construction shown in the
drawings, arm structure 41 is comprised of a U-shaped rod 42, which
has upper and lower legs, 43 and 44 respectively, welded at upper
and lower ends, respectively, of sleeve 40, to provide them with
the maximum vertical spacing from one another.
A substantially vertically disposed attachment plate 45 is welded
integrally to rod 42, and is provided along its vertical dimension
with spaced pivot attachment holes 46a, 46b, and 46c. In the
particular assembly illustrated, arm structure 41 is pivotally
attached to the side of waist belt 17 by a pivot assembly 47 which
passes through a grommeted hole 48 in the side of waist belt 17. In
FIG. 2, a second grommeted hole 49 in waist belt 17 is illustrated
to show that a plurality of grommeted holes 48 and 49 may be used
to provide selective location of waist pivot 47, to accommodate the
needs of a particular person. Pivot assembly 47 may be constructed
of a typical bolt 50, nut 51 and spacing washers 52.
It is a preferred construction to restrict the movement of the hip
riders 21 and 22, to optimum defined ranges of movement which
cooperate with the stride of the person as he hikes along, without
subjecting him to exaggerated jerkiness. Suitable restriction of
rotation about waist belt pivot 47, which projects approximately
sidewise of the person wearing pack 10 and approximately
horizontally, is accomplished simply by adjustment of the shoulder
straps 14 and 15, and is restricted to some extent by the pivot
attachment 47, in cooperation with the force of gravity in the load
of pack 10.
The swinging of the lower end of pack 10 in a horizontal plane,
about the substantially vertical axis of sleeve 40, is preferably
restricted by a stop 60, which defines a predetermined angle of
swinging range permitted to the arm structure 41. The simple but
effective stop construction 60 shown in the preferred embodiment
illustrated is comprised of a stop pin 61, which is mounted
transversely in right side bar 25, with its ends projecting through
opposite arcuate slots 62 and 63 in the sidewalls of the sleeve 40.
Pin 61 is retained by a head 64 and a retainer ring of any suitable
type 65. It will be seen from FIG. 2 and the sectional view of FIG.
3 that horizontal swiveling of arm 41 is permitted through a
restricted angle indicated by the double-headed arrow 67.
* * * * *