Exercise devices – User manipulated force resisting apparatus – component... – Utilizing weight resistance
Reexamination Certificate
2000-05-17
2001-05-01
Mulcahy, John (Department: 3764)
Exercise devices
User manipulated force resisting apparatus, component...
Utilizing weight resistance
C482S108000
Reexamination Certificate
active
06224520
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a dumbbell, particularly to one having a bar, a weight respectively fixed with two ends of the bar and containing iron sand wrapped in an elastic cloth bag and changeable to a different weight according to a user's need. In addition, the weight is flexible in its shape, so when the dumbbell falls down on the ground by accident, it cannot produce large sound, or hurt the feet of the user owing to its flexibility, and thus is very safe to use.
A known conventional dumbbell shown in
FIG. 1
includes a bar
10
, a contact edge
11
formed at two ends of the bar, a support end
12
respectively formed to extend outward from the stop edge
11
, a weight
13
of different weights fitted on the support end
12
. The support end
12
has an inner threaded hole
120
and a stop means
14
screwed with the outer end of the support end
12
. The stop means
14
has a threaded rod
140
extending outward to screw with the inner threaded hole
120
of the support end
12
, with the stop means and the stop edge
11
limiting the weight
13
on the support end
12
in a stabilized condition. When the weight
13
is to be changed to another one, only loosen the stop means
14
and take off the old weight the support end
12
, and then put a new weight
13
on the support end
12
and screw tightly the stop means
14
.
However, the weights of the conventional dumbbell are generally a hard solid one, to a user may often let it fall down carelessly, producing an extremely large sound with the weights broken. So a user has to use it very carefully, lest he should let it fall down to hurt a person around. Moreover, if the stop means
14
should loosen and fall down for an unknown reason, an accident may happen.
SUMMARY OF THE INVENTION
The objective of the invention is to offer a dumbbell simple in changing the weights, and very safe to use, and producing quite little sound even if it should fall down.
The main feature of the invention is two weights respectively made of an elastic annular cloth bag containing iron sand, and a bar provided with a soft cushion, and a vertical stop disc respectively formed in two ends of the bar, and an annular projection respectively formed to extend outward from each vertical stop disc and provided with an annular groove on its outer annular surface. Further, an end cap is provided to fit with the annular projection of the two ends of the bar, having an outer convex side and a tubular projection extending inward from the outer side and provided with an annular projection on an inner annular surface to engage with the annular groove of the two ends of the bar. Then a support space is formed between the end cap and the vertical stop disc for each weight to fit around it. Then even if the dumbbell should fall down, the two weights may not produce sound or break, as they may change the shape as flat as possible owing to the elastic annular cloth bags with iron sand wrapped therein when they strike the ground surface.
REFERENCES:
patent: 6010436 (2000-01-01), Obery et al.
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