Exercise devices – User manipulated force resisting apparatus – component... – Utilizing weight resistance
Reexamination Certificate
1999-03-08
2001-03-06
Mulcahy, John (Department: 3764)
Exercise devices
User manipulated force resisting apparatus, component...
Utilizing weight resistance
C482S108000, C482S098000
Reexamination Certificate
active
06196952
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to an exercise device, and more particularly to an adjustable dumbbell for muscular exercise.
BACKGROUND OF THE INVENTION
The conventional dumbbell of the most primitive type is integrally made of a metal material by casting and is therefore provided with a fixed weight. The conventional dumbbell of the more advanced type is provided with a plurality of round weights joined by a short bar by which it is lifted or swung about in the hand for muscular exercise. Such a dumbbell is therefore adjustable in weight. The round weights are movable and can therefore fall on the ground accidentally to inflict a wound on the dumbbell user or bystanders.
In order to overcome the shortcomings of the conventional dumbbells described above, a prior art dumbbell is provided with a plurality of rectangular weights. The number of weights that can be lifted along with the dumbbell main body can be easily manipulated by changing the position of a fastening pin in a groove. In light of the fastening pin being located in the groove insecurely, the weights can accidentally fall on the ground at the time when the dumbbell is in use. After the prolonged use of the dumbbell, the fastening pin is vulnerable to deformation, thereby causing the fastening pin to unable to press securely against the connection rod of the weights.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an improved dumbbell free from the deficiencies of the prior art dumbbells described above.
The foregoing objective of the present invention is attained by a dumbbell comprising a carrying seat, a plurality of weights, and a weight-adjusting device. The carrying seat is formed of two parallel plates, two hollow rods and a grip. The parallel plates are provided with a receiving cell, a through hole, and a plurality of grooves. Each of the weights has two identical block bodies which are provided with two through holes and a plurality of grooves. Two connection rods are disposed between the bottoms of the two block bodies and are different in length to facilitate the juxtaposing of the weights. The weight-adjusting device comprises an adjustor, and four pins which can be extracted from or retracted into the plates such that the pins are received at one end thereof in the through holes of certain block bodies, thereby coupling the carrying seat with a desired number of the weights.
The foregoing objective, features, and functions of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of two preferred embodiments of the present invention with reference to the accompanying drawings.
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Browdy and Neimark
Hwang Victor K.
Mulcahy John
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