Exercise devices – Involving user translation or physical simulation thereof
Reexamination Certificate
2000-11-03
2002-01-01
Crow, Stephen R. (Department: 3764)
Exercise devices
Involving user translation or physical simulation thereof
C280S265000, C280S221000, C280S254000
Reexamination Certificate
active
06334838
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an exercising cart structure which not only can achieve an entertaining function, but also enables a user to stably exercise by treading the pedals with strength saved.
2. Description of the Related Art
FIG. 1
shows an existent handle-controlled skate board which includes a frame body
10
, two torque springs
20
, two levers
30
and two pedals
40
. A handle
12
is mounted on a stem
11
of front side of the frame body
10
. A front fork
13
is disposed on lower side of the stem
11
. A front wheel
14
is mounted on the front fork
13
. A retaining shaft
15
having a locating hole
151
is disposed on a middle section of the frame body
10
near front side thereof. A base board
16
is disposed behind the retaining shaft
15
. A rear wheel
17
is mounted on rear side of the frame body
10
. A ratchet
18
is mounted on each of two sides of the rear wheel
17
. The two levers
30
are symmetrically arranged. A tubular section
31
is disposed at front end of each lever
30
. A middle section of the lever
30
is upward inclined by a certain angle. Two laterally extending fixing lugs
32
having locking holes
321
are disposed on two sides of the lever
30
. A U-shaped channel seat
33
downward extends from rear end of the lever
30
. Referring to
FIG. 2
, the channel seat
33
is formed with several perforations
331
at equal intervals. A shaft pin
34
is passed through each perforation
331
to pivotally connect a driving block
35
in the channel seat
33
. An outer side of the driving block
35
is formed with a pivot hole
351
for the shaft pin
34
to pass therethrough. An inner upper side of the driving block
35
is formed with an leaning face
352
for engaging with a bottom face of the channel seat
33
. A lower side of the driving block
35
is formed with an escape face
353
. An outer lower side of the driving block
35
is formed with a wedge angle
354
. The pedal
40
is formed with through holes
41
.
When assembled, as shown in
FIG. 3
, the two torque springs
20
are fitted on the retaining shaft
15
of the frame body
10
with one end of the torque spring
20
positioned on the frame body
10
. Then the tubular sections
31
of the two levers
30
are respectively fitted around the retaining shaft
15
of the frame body
10
on outer sides of the torque springs
20
. The other end of the torque spring
20
is positioned under the lever
30
, whereby the lever
30
is lifted to lean against the lower side of the base board
16
of the frame body
10
. Under such circumstance, the channel seat
33
at the rear end of the lever
30
is right positioned above the ratchet
18
of rear side of the frame body
10
. Then an insertion pin is inserted into the locating hole
151
to fix the torque springs
20
and the levers
30
. Finally, screws are passed through the through holes
41
of the pedals
40
to lock the pedals
40
at the locking holes
321
of the lugs
32
of the levers
30
. At this time, the assembly is completed.
The above conventional structure has some shortcomings as follows:
1. A user stands on the base board
16
of the frame body
10
to alternately step on the pedals
40
and the levers
30
. At this time, the leaning faces
352
of the driving blocks
35
at rear end of the lever
30
abut against the bottom face of the channel seat
33
and the wedge angles
354
on outer side drive the ratchets
18
on two sides of the rear wheel
17
so as to rotate the rear wheel
17
and make the skate board move forward. When stepping onto the pedals
40
, a swinging force is exerted onto two sides of the skate board. Moreover, the skate board is equipped with only one single front wheel
14
and one single rear wheel
17
so that it is hard to keep the skate board balanced and ride the skate board stably. It often takes place that a not experienced rider falls down when riding the skate board.
2. The lever
30
swings with only one end thereof fixed on the retaining shaft
15
. Therefore, the lifted rear end of the lever
30
tends to displaced and collided. This often deflects the U-shaped channel seat
33
from the ratchet
18
and leads to difficulty in matching the driving block
35
with the ratchet
18
.
3. The ratchets
18
are fixed on two sides of the rear wheel
17
and exposed to outer side. A user or other people may incautiously touch the ratchets
18
and get hurt.
4. The torque springs
20
resiliently keep the levers
30
lifted.
After a period of use, the resilience of the torque springs
20
will fail. This deteriorates the operation of the levers
30
.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an exercising cart structure in which the transmission gears of the driving wheel unit are engaged with the rack downward extending from the pedal on entire tooth face so that the engaged tooth faces will not be displaced and deflected.
It is a further object of the present invention to provide. the above exercising cart structure in which the rack of the pedal is able to directly rotates the transmission gears. Moreover, the guide rod of the main supporting rack is passed through the guide arch slot of the rack so that the travel of the pedal is limited within a safe range.
It is still a further object of the present invention to provide the above exercising cart structure in which the exercising cart is equipped with two front wheels and two rear wheels so that the exercising cart stably touches the ground at four points. Therefore, when treading the exercising cart and a laterally swinging force is exerted there onto, the exercising cart is still stably supported without possibility of turning over.
It is still a further object of the present invention to provide the above exercising cart structure in which the oil pressure cylinders are mounted under the pedals for restoring the pedals. In addition, the oil pressure cylinders serve to exercise the feet of the user when treading down the pedals. Therefore, the exercising cart not only can achieve an entertaining function, but also can achieve a treading exercising function with strength saved.
The present invention can be best understood through the following description and accompanying drawings wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a perspective exploded view of a conventional handle-controlled skate board;
FIG. 2
is an enlarged view of the channel seat of the end of the lever of the conventional handle-controlled skate board;
FIG. 3
is a perspective assembled view of the conventional handle-controlled skate board;
FIG. 4
is a perspective exploded view of the exercising cart of the present invention;
FIG. 5
is a perspective assembled view of the exercising cart of the present invention; and
FIG. 6
shows the treading operation and forward movement of the exercising cart of the present invention.
REFERENCES:
patent: 4411442 (1983-10-01), Rills
patent: 4515362 (1985-05-01), Lin
patent: 4861054 (1989-08-01), Spital
patent: 6131933 (2000-10-01), Fan
patent: 6142493 (2000-11-01), Wang et al.
Bacon & Thomas PLLC
Crow Stephen R.
LandOfFree
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