Exercise devices – Involving user translation or physical simulation thereof – Stair climbing
Reexamination Certificate
2001-03-20
2002-02-19
Crow, Stephen R. (Department: 3764)
Exercise devices
Involving user translation or physical simulation thereof
Stair climbing
C482S054000, C482S035000
Reexamination Certificate
active
06348024
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tread exercising machine, and more particularly to a tread exercising machine that can be used to perform the exercising action of mountain climbing and walking.
2. Description of the Related Prior Art
The closest prior art of which the applicant is aware is disclosed in the Taiwanese Patent Application serial No. 89214245, entitled “MOUNTAIN CLIMBING MACHINE”. In the patent application, the mountain climbing machine comprises two opposite side plates
10
, and a plurality of steps
20
mounted between the two side plates
10
. Each side plate
10
defines a guide groove
11
whose outer periphery is provided with a guide plate
12
. Each side plate
10
has two ends each secured with a bearing seat
13
for insertion of a bearing
131
. A drive shaft
50
is mounted between two bearings
131
. The drive shaft
50
has two ends each respectively combined with a drive wheel
30
which is rotated by a drive motor
40
. Each step
20
has two ends each mounted with a linking shaft
21
and a guide rod
22
. The linking shafts
21
of each step
20
are connected by a connecting rod
211
so that the steps
20
are connected with each other. The linking shaft
21
is driven by the drive wheel
30
. The guide rod
22
of each step
20
has an outer end received in the guide groove
11
of the side plate
10
, so that each step
20
can be moved along the track of the guide groove
11
, whereby the steps
20
are moved downward from the upper position of the side plates
10
, such that the user can tread the steps
20
to move upward, thereby forming the exercising action like climbing the mountain.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a tread exercising machine that can achieve the exercising effects of climbing the mountain and walking.
Another objective of the present invention is to provide a tread exercising machine, wherein each step can be linked and moved fluently.
In accordance with the present invention, there is provided a tread exercising machine comprising: two parallel symmetrical side walls, a plurality of serially arranged steps that may produce predetermined recycling action, and a housing mounted on the two side walls, wherein,
each of the two side walls has one opposite side pre-fit with a cam groove and a chain guide groove each having a symmetrical track, each of the two side walls has two opposite ends pivoted with a shaft, each shaft is respectively secured with a sprocket located adjacent to an inner side of the side wall, a chain is mounted between two opposite sprockets, the chain is inserted into the sprocket guide groove of the side wall;
each of the steps has two end faces each provided with a protruding shaft and a retaining shaft respectively, the protruding shaft has a free end secured with a bearing, the bearing is inserted into the cam groove of the side wall to form a rolling state, the retaining shaft has an end portion combined with the chain at a position with a preset span, the two chains are driven by a driver, so that each of the steps produce a predetermined movement with the track of the cam groove and the chain guide groove, thereby forming a stepwise slope region, and a smooth platform region.
The chain guide groove is formed with a flange extended toward a bottom edge of the chain, and the bottom edge of the chain is rested on the flange.
Each of the steps has a surface provided with a plurality of transversely extended insert blocks and recesses so that the steps can be inserted with each other, and the housing defines a plurality of recesses at predetermined positions so that the insert blocks on the surface of the steps are inserted into and slide in the recesses of the housing.
REFERENCES:
patent: 4726581 (1988-02-01), Chang
patent: 5328420 (1994-07-01), Allen
patent: 5328422 (1994-07-01), Nichols
patent: 5352166 (1994-10-01), Chang
patent: 5556352 (1996-09-01), Chang
patent: 5769759 (1998-06-01), Alter et al.
patent: 6095952 (2000-08-01), Ali et al.
Crow Stephen R.
Rosenberg , Klein & Lee
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