U.S. patent number 3,608,898 [Application Number 05/038,666] was granted by the patent office on 1971-09-28 for treadmill with curved axles supporting the belt.
Invention is credited to Evan H. Berlin.
United States Patent |
3,608,898 |
Berlin |
September 28, 1971 |
TREADMILL WITH CURVED AXLES SUPPORTING THE BELT
Abstract
A treadmill utilizing an endless belt which permits a user to
run while remaining in one place. Curved axles supporting driving
wheels are employed to minimize the number of driving wheels and
axles employed. Each axle rotatably supports one wheel at its
center and one wheel at each end. These axles are curved in a
horizontal plane so that the center wheel is offset from the end
wheels.
Inventors: |
Berlin; Evan H. (Lake City,
PA) |
Family
ID: |
21901214 |
Appl.
No.: |
05/038,666 |
Filed: |
May 19, 1970 |
Current U.S.
Class: |
482/54 |
Current CPC
Class: |
A63B
22/02 (20130101); A63B 22/0023 (20130101) |
Current International
Class: |
A63B
22/00 (20060101); A63B 22/02 (20060101); A63b
023/06 () |
Field of
Search: |
;272/69 ;198/184 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Pinkham; Richard C.
Assistant Examiner: Dror; Richard
Claims
Having thus described this invention what is asserted as new
is:
1. Exercise apparatus comprising:
a hollow rectangular frame having open top and bottom surfaces;
a plurality of horizontal spaced axles extending in spaced
horizontally coplanar positions between opposite sides of the
frame, at least some of these axles being curved in a horizontal
plane whereby the midpoint of each curved axle is in the same
horizontal plane, as but is disposed offset and equidistantly
spaced from both ends thereof;
a like plurality of pairs of driving wheels, each wheel in the pair
being rotatably disposed about a corresponding end of a
corresponding axle, all of said wheel pairs being parallel and
coplanar;
an additional and like plurality of individual driving wheels
parallel to and coplanar with said wheel pairs, each individual
wheel being rotatable about the midpoint of the corresponding axle;
and
an endless belt having a longitudinal direction of rotation
extending transversely to said axles, said belt being wrapped about
and in peripheral contact with all of said wheels and spaced from
said axles.
2. Apparatus as set forth in claim 1 wherein others of said axles
are straight and parallel.
3. Apparatus as set forth in claim 2 wherein there are two straight
axles, each straight axle being disposed adjacent a corresponding
end of the frame.
4. Apparatus as set forth in claim 3 further including manually
adjustable means secured to one end of said frame to vary the angle
of inclination of said frame with respect to the horizontal.
Description
SUMMARY OF THE INVENTION
A rectangular frame supports a plurality of transversely extending
horizontal axles. These axles have at each end and at the midpoint
a separate driving wheel freely rotatable thereabout. Some of the
axles as viewed in a horizontal plane are curved intermediate their
ends to offset the center wheel from the end wheels. An endless
belt freely rotatable in the frame is wrapped around the axles to
engage the wheels and to be spaced from the axles. A user runs on
top of the belt which rotates with the wheels to enable the user to
remain in one place while running. Use of the offset wheels enables
greater separation between adjacent axles for a given size of frame
over that obtainable when straight parallel axles are used whereby
the number of axles and driving wheels is reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a top cutaway view of my invention;
FIG. 2 is a cross-sectional end view thereof;
FIG. 3 is a detail top view thereof;
FIG. 4 is a detail end view thereof;
FIG. 5 is a cross sectional side view thereof; and
FIG. 6 is a perspective view thereof.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to FIGS. 1-6, a hollow rectangular frame 10 having
open top and bottom surfaces is provided at one end with manually
adjustable screws 12 to vary the separation between this end and
the ground, floor or other supporting surface whereby the frame can
be inclined or level. As the angle of inclination is increased, the
energy required to operate the apparatus is increased whereby more
strenuous exercise is involved. A handle 14 to be used, when
desired, as a support by a user is secured to, and extends upward
from this one end.
A plurality of spaced horizontal axles having freely rotatable
driving wheels 16 at each end extend within the frame between
opposite sides. The axles 18 immediately adjacent each end are
straight and parallel; all other axles 22 curve in the same
direction, as viewed in the horizontal plane, between their ends
whereby the midpoint of each axle is equidistantly offset from both
ends. (These axles, as viewed in vertical planes, do not curve). An
additional driving wheel 24 is secured to the midpoint of each axle
and is freely rotatable thereabout. All wheels 16 and 24 are
parallel and are coplanar. However, each wheel 24 is offset from
the corresponding wheels 16.
An endless belt 26 having top and bottom horizontal surfaces is
disposed in the frame and is wrapped about the axles and wheels in
such manner as to engage the periphery of the wheels and to be
spaced from the axles. The longitudinal direction of rotation of
the belt extends transversely to the axles, A user can then run on
the structure while remaining in one place in the usual manner
utilizing a treadmill.
Were all axles to be straight and parallel, a certain quantity of
axles and wheels would be required with a given geometry to provide
proper performance regardless of the position of the user's feet on
the belt. By using curved axles and offset wheels, fewer axles and
wheels are required for the same geometry. Note that straight axles
18 are used to provide proper clearances adjacent the ends of the
frame.
While I have described my invention with particular reference to
the drawings such is not to be considered as limiting its actual
scope.
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