Exercise devices – Sit up device
Reexamination Certificate
2001-08-10
2002-06-25
Donnelly, Jerome W. (Department: 3764)
Exercise devices
Sit up device
C482S132000, C482S907000
Reexamination Certificate
active
06409639
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an exercise wheel and, more particularly, to such an exercise wheel, which is durable in use.
Various exercise wheel designs have been disclosed, and have appeared on the market. Similar designs are seen in U.S. Pat. No. 6,146,318 entitled “PUSH AND PULL TYPE ROLLER EXERCISER”; U.S. Pat. No. 6,017,296 entitled “EXERCISE WHEEL”. The “EXERCISE WHEEL” of U.S. Pat. No. 6,017,296, as shown in
FIG. 9
, comprises a housing
51
, a grip rod
52
which is put through the housing
51
such that both longitudinal ends thereof are left out in the outside of the housing
51
, a main wheel
53
rotatably mounted on the grip rod
52
inside the housing
51
, two auxiliary wheels
54
sets pivoted in the housing
51
such that they are linked with the main wheel
53
, and at least one elastic recovery device, for example, a torsional spring
56
disposed between the main wheel
53
and the housing
51
for providing the main wheel
53
with a recovery force enabling the main wheel
53
to return to its original angular position. This design of exercise wheel is not durable in use because the torsional spring
56
wears quickly with use and no means is provided to limit the dead point of deformation of the torsional spring
56
. Because the main wheel
53
and the auxiliary wheels
54
are gear wheels meshed together, teeth of the main wheel
53
and the auxiliary wheels
54
wear quickly with use and produce much noise during transmission. Further, the gear transmission design of the wheels
53
;
54
greatly increases the manufacturing cost of the exercise wheel. The design of “PUSH AND PULL TYPE ROLLER EXERCISER” of U.S. Pat. No. 6,146,318 has similar drawbacks.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide an exercise wheel, which eliminates the aforesaid drawbacks. It is the main object of the present invention to provide an exercise wheel, which is durable in use. It is another object of the present invention to provide an exercise wheel, which produces less noise during operation. According to one aspect of the present invention, the exercise wheel comprises a housing, a wheel base equipped with two main wheels and a front balance wheel and mounted in the housing, a slide slidably mounted in a longitudinal track in the wheel base, a torsional spring disposed between the slide and the longitudinal track for providing the slide with a recovery force enabling the slide to return to its original position, and a belt connected between a wheel axle, which is rotated with the main wheels to take up/let off the belt when the user reciprocate the exercise wheel on the floor, and the slide. Because the slide is mounted in the longitudinal track and moved to stretch/release the tensile spring, the longitudinal track limits the amount of deformation of the tensile spring. Further, because the invention eliminates the use of gear transmission means, less noise is produced during the operation of the exercise wheel.
REFERENCES:
patent: 1824920 (1931-09-01), Novak
patent: 3752475 (1973-08-01), Ott
patent: 6254518 (2001-07-01), Yu
patent: 6264587 (2001-07-01), Lee
Donnelly Jerome W.
Rosenberg , Klein & Lee
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