Exercise wheel

Exercise devices – User manipulated force resisting apparatus – component... – Utilizing force resistance generated by user only

Reexamination Certificate

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Details

C482S127000, C482S907000

Reexamination Certificate

active

06264587

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an exercise wheel that has a longer travel, prevents backward displacement, and increases longevity of torsion springs. The present invention also relates to an exercise wheel that can be operated with less force and adjusted according to user's demand.
2. Description of the Related Art
FIGS. 6 and 7
of the drawings illustrates a conventional exercise wheel that includes a housing
1
′, two grip rods
2
′, a main gear
3
′, two roller pairs
4
′, and two torsion springs
5
′. The housing
1
′ includes a compartment with a downwardly facing opening and aligned holes
11
′ on two sides thereof into which the grip rods
2
′ are mounted. Two stop rods
12
′ are mounted inside the housing
1
′. The main gear
3
′ is mounted to the grip rods
2
′ and includes a peg
32
′ on each side thereof. Each roller pair
4
′ includes two rollers
41
′ connected by a shaft
42
′ that has teeth
421
′ formed on an outer periphery thereof for meshing with teeth
31
′ of the main gear
3
′. Each torsion spring
5
′ includes two ends
52
′ and
53
′ that are attached to an associated peg
32
′ and an associated stop rod
12
′, respectively.
When in use, the user bends downward and grasps the grip rods
2
′ to make roller pairs
4
′ roll on the ground. During rolling of the roller pairs
4
′, the torsion springs
5
′ are tensioned by the main gear
3
′ via transmission of the teeth
421
′ and
31
′. When the main gear
3
′ is turned for one turn the end
52
′ of the torsion spring
51
′ bears against the stop rod
12
′, and the main gear
3
′ and the roller pairs
4
′ are thus stopped. Thus, maximal travel of the exercise wheel is limited. The torsion springs
51
′ may return the exercise wheel to its initial position.
Nevertheless, it is found that the maximum travel for the exercise wheel corresponds to one turn of the main gear
3
′, which might be insufficient for the user whereby a larger gear is required for a longer travel. In addition, the torsion springs
5
′ might be damaged or even broken if the torsional travel is too large for the torsion springs
5
′. As a result, the ends
52
′ and
53
′ of the torsion springs
5
′ might disengage from the stop rods
12
′ and the pegs
32
′ and thus cause injury to the user. Further, the roller pairs
4
′ are aligned one with the other such that the exercise wheel can be moved rectilinearly only.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an exercise wheel that allows curvilinear movement.
It is another object of the present invention to provide an exercise wheel that provides longer longevity for the torsion springs.
It is a further object of the present invention to provide an exercise wheel that allows a longer travel and prevents backward displacement.
In accordance with a first aspect of the invention, an exercise wheel comprises:
a housing having two sides,
a chassis housed by the housing and including a compartment,
a pair of rollers rotatably mounted in the compartment of the chassis and connected by a shaft,
a main gear rotatably mounted in the compartment of the chassis and having two sides,
means for providing transmission between the shaft of the rollers and the main gear,
a pair of torsion springs respectively mounted to the two sides of the main gear and each having a first end and a second end, the first end of each said torsion spring being attached to an associated said side of the main gear, the second end of each said torsion spring being attached to the chassis, each said torsion spring being deformed to store resilience when the main gear is turned, thereby returning the main gear,
two grip rods secured to the two sides of the housing, respectively, and
a universal caster mounted to an underside of the chassis, thereby allowing the user to change moving direction of the exercise wheel.
In accordance with a second aspect of the invention, an exercise wheel comprises:
a housing having two sides,
a chassis housed by the housing and including a compartment,
a pair of rollers rotatably mounted in the compartment of the chassis and connected by a shaft,
a main gear rotatably mounted in the compartment of the chassis and having two sides,
a transmission gear for providing transmission between the shaft of the rollers and the main gear, the transmission gear being so constructed that the main gear is rotated through an angle less than 360° when the rollers are turned through 360°,
a pair of torsion springs respectively mounted to the two sides of the main gear and each having a first end and a second end, the first end of each said torsion spring being attached to an associated side of the main gear, the second end of each said torsion spring being attached to the chassis, and
two grip rods secured to the two sides of the housing, respectively.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 3752475 (1973-08-01), Ott
patent: 4657244 (1987-04-01), Ross
patent: 5707325 (1998-01-01), Chiou
patent: 6017296 (2000-01-01), Tang et al.

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