Exercise devices – Involving user translation or physical simulation thereof – Treadmill for foot travel
Reexamination Certificate
2002-12-12
2004-06-08
Crow, Stephen R. (Department: 3764)
Exercise devices
Involving user translation or physical simulation thereof
Treadmill for foot travel
C482S904000
Reexamination Certificate
active
06746376
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a folding structure for a treadmill and which includes two sub-wheels movably received in the side rails of the base of the treadmill and the sub-wheels come out from two openings of the side rails to contact the floor when the treadmill is folded.
BACKGROUND OF THE INVENTION
A conventional treadmill is shown in
FIGS. 8A and 8B
and generally includes a base
72
which is pivotably connected to the frame
70
on which the belt of the treadmill is installed. A lifting mechanism
73
is connected to the base
72
and includes links
731
which has one end connected to a motor and worm system and the other end of the links
731
has a wheel
732
connected thereto which contacts the floor. Two sub-wheels
721
are located at an end of the base
72
so that when the frame
70
is located at a horizontal position as shown in
FIG. 8A
, the wheels
732
, the sub-wheels
721
and the two legs
711
on the frame
70
contact the floor to support the frame
70
. When the frame
70
is lifted at an angle relative to the floor frame
70
, the sub-wheels
721
are lifted as shown in FIG.
8
B. As shown in
FIG. 7
, when the frame
70
is folded to an upright position, only the wheels
732
contact the floor so that the whole treadmill moves on the floor and it is inconvenient to fold in up.
The present invention intends to provide a folding structure that includes two sub-wheels movably received in the side rails of the base and the two sub-wheels come out from two openings in the side rails so as to contact the floor to support the balance of the folded treadmill.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a foldable treadmill which comprises a base having two hollow side rails and two openings are defined through an underside of the two side rails respectively. A slot is defined in an inner side of each of the two side rails and communicates with an interior of each side rail. Two arms of a handle are connected to the two side rails. A frame has two sides and two links are pivotably connected between the two arms of the handle and the two sides of the frame. An assistant frame is located between the two side rails of the base and has a first transverse bar. Two support links are connected to the first transverse bar and the underside of the frame. Two sub-wheels are connected to the two ends of the first transverse bar and movably received in the interior of the two side rails via the slots. The sub-wheels come out from the two openings when the frame is upright folded.
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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