Exercise devices – Involving user translation or physical simulation thereof – Treadmill for foot travel
Reexamination Certificate
2002-04-19
2004-06-08
Crow, Stephen R. (Department: 3764)
Exercise devices
Involving user translation or physical simulation thereof
Treadmill for foot travel
Reexamination Certificate
active
06746374
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a treadmill that has a folding device comprising two rollers movably received in side tubes of the base and dropping through holes in the bottom of the side tubes to contact the floor when the operation frame is folded upward.
BACKGROUND OF THE INVENTION
A conventional treadmill is shown in
FIGS. 7
,
8
A and
8
B and generally includes a base
72
and an end of the operation frame
70
is pivotally connected to the base
72
. A folding device
73
is connected to the base
72
and includes links
731
which are driven by a worm rod and a motor so as to lift the end of the operation frame
70
as shown to adjust the inclination of the operation frame relative to the floor. The folding device
73
has a pair of rollers
732
, the front end of the base
72
has another pair of rollers
721
and the operation frame
70
has two protrusions
711
. The rollers
732
,
721
and the protrusions
711
support the whole treadmill. It is not convenient for the user to fold the operation frame
70
upward because the rollers
732
make the treadmill to move and this movement results in a difficulty for folding the operation frame
70
.
The present invention intends to provide a folding device for a treadmill wherein the folding device has rollers received in the tubes of the base and contacting the floor when the operation frame is folded to upright position.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a treadmill which comprises a base comprising two side tubes and each side tube has a slot in an inside thereof. An aperture is defined in an underside of each of the two side tubes and communicates with an interior of the side tube corresponding thereto.
A folding device comprises a shaft and two rollers are connected to two ends of the shaft. Two ends of the shaft extend in the two respective slots and the two rollers are received in the interior in the two side tubes. Two side frames are connected to the shaft and two sides of an operation frame are pivotally connected to the two side frames. Two links are pivotally connected between the two side frames and the two side tubes of the base.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
REFERENCES:
patent: 5868648 (1999-02-01), Coody et al.
patent: 6050923 (2000-04-01), Yu
patent: 6419612 (2002-07-01), Yu
patent: 6638200 (2003-10-01), Chang
Crow Stephen R.
Rosenberg , Klein & Lee
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