Exercise devices – Sit up device
Reexamination Certificate
2000-02-29
2001-07-03
Donnelly, Jerome W. (Department: 3764)
Exercise devices
Sit up device
C482S132000
Reexamination Certificate
active
06254518
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to an exercise device, and more particularly to an exercise wheel.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, an exercise wheel of the prior art comprises a hollow shaft
81
, which is provided with a slot
82
extending from one end thereof to a midpoint thereof, a volute spring
83
provided with a locating piece
831
which is retained in the slot
82
of the shaft
81
, two rollers
84
provided at the center thereof with a round hole
85
dimensioned to fit over both ends of the shaft
81
. The two rollers
84
are provided with a hollow guide pillar
86
for fastening a bolt
87
. One guide pillar
86
′ is shorter than the other guide pillar
86
for engaging the locating piece
832
of the volute spring
83
. In operation, both hands of an exerciser hold two ends of the shaft
81
to roll the roller on a surface in a reciprocating manner. As the wheel is rolled forward, the volute spring
83
is compressed. When the wheel is rolled backward, the wheel is provided by the compressed volute spring
83
with a recovery spring force. The prior art exercise wheel described above is defective in design in that it has only one wheel by which the exerciser can not keep his or her body in balance with ease, thereby subjecting the exerciser to an injury.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an exercise wheel free from the drawback of the prior art exercise wheel described above.
The exercise wheel of the present invention comprises a housing, a hold bar, a main wheel, an elastic device, an auxiliary wheel, and a front wheel. The hold bar is put through the housing such that both ends of the hold bar are jutted out of the housing to serve as hand grips. The main wheel is provided with a protrusion and is mounted on the hold bar such that the main wheel is located in the housing. The main wheel is forced by an external force to turn on the hold bar. The elastic device is disposed between the main wheel and the housing for providing the main wheel with a recovery force after the main wheel has turned. The rotation of the main wheel is assisted by the auxiliary wheel which is pivoted inside the housing and is connected with the main wheel. The auxiliary wheel in motion is stopped by the protrusion of the main wheel at the time when the auxiliary wheel arrives at a predetermined position. The front wheel makes contact with a surface on which the exercise wheel rolls.
REFERENCES:
patent: 1824920 (1931-09-01), Novak
patent: 2920418 (1960-01-01), Britt
patent: 3403906 (1968-10-01), Burzenski
patent: 3752475 (1973-08-01), Ott
patent: 3809393 (1974-05-01), Jones
patent: 6017296 (2000-01-01), Tang et al.
Amerson Lori Baker
Browdy & Neimark PLLC
Chen Chang Co., Ltd.
Donnelly Jerome W.
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