U.S. patent number 3,642,279 [Application Number 05/010,358] was granted by the patent office on 1972-02-15 for treadmill jogger.
Invention is credited to John W. Cutter.
United States Patent |
3,642,279 |
Cutter |
February 15, 1972 |
TREADMILL JOGGER
Abstract
An exerciser of the treadmill type. A pair of rigid side members
support a series of rollers along a concave curve with a forward
portion higher than the rear. A continuous belt has an upper course
lying above and resting on these rollers, and a lower course below
them, so that a person walking, jogging, or running on them
automatically locates himself fore-and-aft of the exerciser by the
balance between his weight, his speed, and the variation in
inclination along the curved path of the continuous belt. In
addition, a foremost roller may guide the belt in front of the
curved path rollers which may have a pair of identical flywheels,
one on each side inboard of the frame for steadying the velocity.
Further, a pair of diagonally extending and crossing turnbuckles
joins the frame sides and enable adjustment of the training of the
belt and the friction on the rollers. A handle, if used, can either
be in a substantially vertical position for a beginner or can be
put down flat and out of the way, for a more practiced user to run
without any impediment. In addition, a forward roller used when
moving the exerciser, is so located that when the frame is in
operating position, the roller does not reduce the resistance to
sliding of the exerciser.
Inventors: |
Cutter; John W. (Piedmont,
CA) |
Family
ID: |
21745378 |
Appl.
No.: |
05/010,358 |
Filed: |
February 11, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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837603 |
Jun 30, 1969 |
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Current U.S.
Class: |
482/54 |
Current CPC
Class: |
A63B
22/02 (20130101); A63B 2210/50 (20130101) |
Current International
Class: |
A63B
22/00 (20060101); A63B 22/02 (20060101); A63b
023/06 () |
Field of
Search: |
;272/69 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Dror; Richard
Parent Case Text
This invention is a continuation-in-part of application Ser. No.
837,603 filed June 30, 1969 and since abandoned.
Claims
I claim:
1. An exerciser of the treadmill type, including in
combination:
a rigid frame having a pair of rigid side members,
a forward portion and a rear portion, and means mounted on said
frame providing a gripping surface for a hand of a person using the
exerciser,
a series of rollers rotatably supported by and lying between said
side members and supported at each said side member at a series of
points forming a line having a relatively flat rear portion merging
upwardly into a generally concave forward portion located at a
higher elevation than said rear portion,
a continuous belt having an upper course lying above all said
rollers and a lower course below all said rollers, said belt having
its upper course supported directly by said rollers,
whereby a person walking, jogging, or running on said belt
automatically locates himself fore-and-aft of said upper course by
the balance between his weight, his speed, and the variation in
inclination along said curved path.
2. The exerciser of claim 1 having, below said belt, diagonally
extending means adjustable in length joining said side members for
enabling adjustment of the degree of rack of the rollers and belt,
so as to control the path of the belt.
3. The exerciser of claim 2 wherein there are two said diagonal
means crossing each other, whereby the friction on the rollers can
be adjusted.
4. The exerciser of claim 1 having, below said belt, a pair of
diagonally extending and crossing turnbuckles joining said side
members and enabling adjustment of the degree of rack of the
rollers and belt, so as to control the path of the belt, and for
varying the friction on the rollers so as to restrict or free their
freedom of rotation.
5. The exerciser of claim 1 in which said means providing a
gripping surface is a handle comprising two parallel members joined
by a cross member at an outer end and attached to said side members
at inner ends forward of said forward portion of said series of
rollers, said parallel members being pivotally supported by said
side members for movement between a lower generally horizontal
inactive position wherein said cross member lies to the rear of
said belt and an upper generally vertical position, and releasable
means for maintaining said handle in said generally vertical
position.
6. The exerciser of claim 1 wherein the lower edges of said side
members have a main flat portion for resting on a floor and
supporting said exerciser and frictionally resisting sliding of the
exerciser along the floor, and a forward upwardly inclined portion,
and an additional roller rotatably supported by and between said
side members at their said forward portions, said roller extending
below the edge of said forward portion but not below the edge of
said main portion, whereby said roller does not reduce the normal
ability of the exerciser to resist sliding movement but, when the
rear end of the exerciser is raised, said roller engages the floor
and supports the entire exerciser, enabling it to be moved along
readily on said roller.
7. The exercizer of claim 1 including in combination:
a foremost roller forward of and lower than the forward portion of
said series of rollers, rotatably supported by and lying between
said side members, said belt being trained over said foremost
roller.
8. The exerciser of claim 7 wherein said foremost roller has a pair
of identical flywheels, one on each side the same distance from the
center of said foremost roller, mounted inboard of said side
members, for providing a smooth flywheel action tending to keep the
velocity of the belt steadier and balancing the action while
guiding the belt along its path.
9. The exerciser of claim 8 having, below said belt, diagonally
extending means adjustable in length joining said side members and
enabling adjustment of the degree of rack of the rollers and belt,
so as to control the path of the belt.
10. The exerciser of claim 7 having, below said belt, a pair of
diagonally extending turnbuckles crossing each other joining said
side members and enabling adjustment of the degree of rack of the
rollers and belt, so as to control the path of the belt, and for
varying the friction on the rollers so as to restrict or free their
freedom of rotation.
Description
Exercisers that employ a treadmill are well known, but heretofore a
number of difficulties have prevented their being used to greatest
advantage and have inhibited their popularity. A principal problem
has been that of how to restrain the user from walking off or
running off or falling off the end of the machine and possibly
injuring himself, and how to exercise this restraint without so
encumbering his body that he is unable to move naturally with the
freedom of normal walking, jogging, or running. One approach that
has been taken has been to motorize the treadmill, but while
motorization partly solves the problem, it is expensive and it
requires the user to adjust this speed to a preselected rate, the
speed of the motor, rather than letting him be free to vary his
speed as he wishes or as he should do. Another approach has been to
provide various types of harnesses and belts, but these have
unfortunately not been very successful in accomplishing their
purpose. Another approach has been to rely on a handle of some type
which the user has to grasp while he is walking, jogging, or
running. When he does this, of course, he encumbers the natural
swing of his arms and he does not get a true walking, jogging, or
running action.
I have traced the problem to its root, and I now provide a novel
solution. Most exercisers of the treadmill type have relied on
supporting the belt by a series of idle rollers that lie along a
flat plane, usually slightly inclined to the horizontal. The
endless belt is therefore similarly inclined, and the user in
overcoming the friction in the system is more or less in
equilibrium with it. This means that the user can be in one
fore-and-aft location as well as another; so there is no natural
regulation of this position; from this fact has flowed the
requirement for the handle, the harness, the belt, or the motor,
all of which encumber to some degree the proper operation of the
device. Some treadmills have provided for adjustment of the angle
of incline, in the hope of capturing a so-called "perfect angle,"
which would enable the user to let go of the handle, but
unfortunately, again, the variation in the weight of the users, as
well as variations in speed from time to time during use, have
meant that the angle would have to be infinitely adjustable, and
then would have to be varied again if the user gains weight or
loses it, or varies his speed while using it.
Another approach that has been taken, provides a belt that is not
rigidly supported but is supported only by rollers at each end.
This imparts somewhat of a curve to the belt's path, but it has the
very undesirable result of inducing a sinking at each step, so that
the user finds himself wallowing or almost wading in the device
rather than running or walking or jogging on it with a natural
action.
I have found that by arranging a series of rollers along a
concavely curved path, and then supporting the belt directly on
them, there is neither a wallowing action, nor is there a set angle
of inclination; instead there is a concave path tending upward
toward the upper end, with each point along the path at a slightly
different angle. In my new structure the user, whether walking,
running, or jogging, tends to achieve almost at once a natural
balance in position at the proper instantaneous angle along the
curve. Therefore his position fore-and-aft of the device, his
presently current weight, and his actual speed of movement are
automatically reconciled to each other. This automatic adjustment
is a very important feature of this invention. No additional
adjustment need be made to regulate this position, no motor need be
used, and once the user has achieved a measure of practice and
accustomed himself to the operation of the device, he does not need
any handle or harness to be perfectly safe on the exerciser.
Another problem which exercisers of the treadmill type have
heretofore had, has been a tendency toward jerky action. Some
improvement has been obtained where a flywheel has been provided
but I have found that special advantages, explained below, can be
obtained from a structure in which there is a pair of identical
flywheels, symmetrically located with respect to the machine and
inboard of the frame.
Another common problem of the treadmills is how to keep the belt
from rubbing along one side of the supporting frame. The result of
such rubbing is, of course, wear and fraying of the belt. Many such
devices come perfectly balanced from the factory, but during
shipment there is enough displacement or warping of the frame to
nullify the original setting, and the belts become improperly
entrained.
I have found that this problem of controlling the proper training
of the belt can be solved by employing a pair of diagonally
extending and preferably crossing turnbuckles that join the two
side members of the frame and enable adjustment of the tightness of
the frame and the relative spacing between them. Not only do these
crossed turnbuckles enable a very accurate and at all times
readjustable training of the belt, to get a perfect movement
thereof, but they also enable adjustment of the friction on the
rollers, to impart more friction where that is desired in order to
make the person exercise somewhat harder.
Another feature of the invention is the use of a folding handle,
which can be placed entirely out of the way but not separately from
the machine, the whole not taking up any more room than the machine
without it, when it is not desired. This folding handle can be
readily erected and held in place when it is needed.
A still further feature of the invention is that of having a front
roller enabling rolling movement of the whole exerciser from one
place to another when the exerciser is raised at the other end;
this front roller is automatically taken out of floor-engaging
position when the machine is again lowered flat on the floor, so
that the frame does not tend to slide or move about during use.
Other objects and advantages of the invention will appear from the
following description of a preferred embodiment.
In the drawings:
FIG. 1 is a view in perspective, somewhat foreshortened, of a
device embodying the principles of the invention. A handle is shown
in solid lines in its normal or inactive position and in broken
lines in a position where it can be used by an inexperienced user.
A person using the device is indicated in broken lines.
FIG. 2 is a top plan view of the treadmill exerciser of FIG. 1 with
a portion of the belt's upper course broken away to show some of
the supporting rollers more clearly.
FIG. 3 is a view in side elevation of the device, looking at FIG. 2
in the direction of the arrows 3--3, with some portions of the
frame broken to show what is behind the frame. For a similar reason
the handle is partly broken away.
FIG. 4 is a bottom plan view of the treadmill exerciser of FIG.
1.
FIG. 5 is a front end view of the treadmill exerciser, looking at
FIG. 4 in the direction of the arrows 5--5, with a portion of the
belt broken away to show more of the rollers.
FIG. 6 is a rear end view of the device, looking at FIG. 4 in the
direction of the arrows 6--6, with another portion of the belt
broken away and the handle and some other portions broken off, a
portion of the handle being shown in section.
FIG. 7 is a view in side elevation on a smaller scale showing the
device in a vertical position for storing it.
FIG. 8 is a similar view of the device tilted at about 45.degree.
for moving it from place to place.
A treadmill exerciser 10 embodying the principles of the invention
is shown in FIGS. 1 through 8. It comprises a pair of side members
11 and 12, which may be connected together at one end by a rod 13
having threaded ends to receive a pair of nuts 14, with appropriate
washers. A tubular spacer 15 fits around the rod 13 and in between
the side members 11 and 12 and governs the distance between them
there. As will be seen later, several other members are also
involved in spacing the side members 11 and 12 apart and still
others in holding them together, providing a substantially rigid
frame.
The inside face of each of the two side members 11 and 12 is
provided with a series of journaling sockets 16, arranged along a
concavely curving path that is highest at its forward end. Each
socket 16 serves as journal for the stub shaft 17 of a roller 18. A
slotted rearmost socket 19 supports the rearmost roller 20 of this
series by its stub shafts 21, and springs 22 tend to pull the
roller 20 toward the rear, i.e., toward the rod 13 to which the
springs 22 are preferably anchored. Also, forward of all the
rollers 18 and preferably somewhat lower is a pair of sockets 23
that rotatably support the stub shaft 24 of a roller 25.
At each side of roller 25 is provided a flywheel 26 or 27,
preferably of heavier metal, such as lead. These flywheels 26 and
27 are identical in size and weight and are located symmetrically
with respect to the center of the roller 25 and are inboard of the
frame, that is they lie adjacent but inside the two side members 11
and 12. This imparts a very smooth action because the flywheels 26
and 27 may be made relatively large and heavy, from a suitable
heavy metal, and they may be able thereby to impart a very smooth
action to the treadmill, quite in contrast to the jerky action that
would be present without any flywheel. Being inboard, the flywheels
26 and 27 can be directly attached to the belt pulley or roller 25
and are not required to be dependent upon a set screw attached to a
shaft. They are much less subject to damage in use or in transit,
both because of this direct attachment and because of their inboard
location. Moreover, the symmetry is very pleasing to the eye, as
compared with the unbalanced appearance of conventional treadmills.
This symmetry and good appearance is important where the exerciser
is used in doctor's offices or in homes.
A continuous belt 30 extends around the rollers 18, 20 and 25 and
is supported by and trained on them. The belt 30 is continuous and
is arranged along a curved path, having the forward portion higher
than the rear portion, and providing a generally concave
configuration. This is a very important feature of the invention
for it enables automatic adjustment of the position of the user to
his weight and speed of use. The belt 30 lies in between the
flywheels 26 and 27; the flywheels 26 and 27 thereby act as belt
guides and aid in keeping the belt 30 centered.
For example, in one successful device embodying the present
invention the elevation of the center of the front roller 18 was 7
inches while the elevation of the rear roller 20 was 31/2 so the
belt 30 was at a small acute angle to the horizontal. The overall
center to center distance between the rollers 18 and 20 was 28
inches. In accordance with this invention, the center of the
arcuate path was such that it was 11/2 inches below a plane
connecting the upper surface of each of the rollers 18 and 20. The
arc of that path was one of a radius of some 121 inches or
approximately three times the length of the path. When the
exerciser 10 is so constructed, a person utilizing the walker is
able to run at a rapid rate and to maintain a constant position
over the endless belt without having to hang on to any hand or side
rail for support.
An important feature of the invention is shown in FIG. 4, a bottom
view: a pair of crossing diagonal turnbuckles 31 and 32 are each
anchored to each of the two side frame members 11 and 12. These
turnbuckles 31 and 32 enable a precise adjustment of the distances
between the side frame members 11 and 12 and the tension on them.
They therefore enable proper training of the belt 30. Even if the
device 10 should be damaged somewhat or set out of proper
adjustment during transportation between the factory and the user,
the user can readily by using the turnbuckles 31 and 32, adjust the
device so that the belt 30 trains properly right down the center.
In addition, the turnbuckles 31 and 32 enable adjustment of the
friction on the shafts 17 of the rollers 18 so that more or less
freedom of rotation can be provided, to give a little added
resistance where needed or minimum resistance to free rotation
where that is desired. The turnbuckles 31 and 32 thus act in
cooperation with the flywheels 26 and 27 to provide a trouble-free
belt-centering system.
In place of turnbuckles other diagonal members which can be
adjusted can be used to alter the course or path of the belt 30 or
to vary the friction on the roller bearings. For example, wires,
springs or threaded rods may be used, though I presently prefer the
turnbuckles shown. Even a single adjustable diagonal connector or
turnbuckle gives advantages, in enabling alteration of the angles
of the rollers relative to the side frame, but two are better in
this and enable adjustment of friction.
One of the main features of the invention, is the unimpeded belt
track that it presents without having to be impeded by any handles,
belts, or other support members and without having to use a motor,
so that the user of it can run on it, or jog on it, or walk on it,
and will have his position located by the concave path. Since the
belt 30 is supported by the rigid rollers 18 and runs right on
their surface, there is no downward yielding every time a user
takes a step and therefore no wading or wallowing action, and an
automatic adjustment of his position is obtained quite naturally
without any effort. Therefore, during normal use, and particularly
by a user who is once used to the device, there is no need for a
handle to be present at all.
However, an inexperienced user, one who is just getting used to it,
or someone who is perhaps not in the best of health and needs a
little steadying, may require such a handle, and a feature of the
device is that it provides a handle 33 that can be put down out of
the way when not desired and can be put up where it is needed, when
it is needed.
The handle 33 may comprise a generally U-shaped member having two
parallel side rods 34 and 35 and a horizontal crossmember 36. The
length of the side rods 34 and 35 is such that when the handle 33
is at its normal unused position, the cross member 36 lies to the
rear of the belt 30 and the roller 20. A threaded rod 37 extends
through the rigid side members 11 and 12, and the handle 33 is
pivoted on it and held there by nuts 38. A concave recess 39 in
each of the side frame members 11, 12 enables seating of the side
rods 34 and 35 when they are erected, and the nuts 38 then hold the
handle 33 firmly in its erected position, whenever that is desired.
No such expedient is needed when the handle 33 is in its inactive
position, of course.
Another important feature of the invention, is that the bottom
edges 41 and 42 of the side members 11 and 12 are flat over a main
portion and therefore rest on the floor and prevent sliding action,
so that the weight of the user is transmitted in a vertical plane
and he may run without tending to cause movement of the exerciser
10 itself; still the exerciser 10 can readily be moved around from
place to place when that is desired and can be stored vertically
(FIGS. 7 and 8). For instance, it may be kept under the bed and
moved in and out, or it may be moved to the side and stored against
the sidewall and various other things are possible. This is made
easier by the use of a forward inclined edges 43 and 44 which rise
up above the floor level and by an additional roller 45 forward of
the belt 30 and not involved with it, lying between the two frame
members 11 and 12 and extending below the edges 43 and 44 of this
forward inclined portion but not below the edges 41 and 42 of the
main portions, and preferably slightly above them. Thus, when the
device rests flat on the floor as shown in FIG. 3, the roller 45
does not interfere at all with the ability of the device to resist
movement but when the rear end of the device is raised, all the
weight of the machine is put onto the roller 45, and the exerciser
10 is easily rolled from place to place, as shown in FIG. 8. When
stored vertically, as in FIG. 7, it rests on front edges 46 and 47,
which lie perpendicular to the edges 41 and 42.
To those skilled in the art to which this invention relates, many
changes in construction and widely differing embodiments and
applications of the invention will suggest themselves without
departing from the spirit and scope of the invention. The
disclosures and the description herein are purely illustrative and
are not intended to be in any sense limiting.
* * * * *