Exercise devices – Skipping – Handheld jump rope
Reexamination Certificate
2002-11-26
2004-05-18
Donnelly, Jerome W. (Department: 3764)
Exercise devices
Skipping
Handheld jump rope
C482S081000, C482S126000
Reexamination Certificate
active
06736763
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
This invention relates to a jump rope device. Specifically, this invention relates to a jump rope structure having two ball chains, so that the rotational friction and drag during high-speed rope jumping can be significantly minimized.
2. Description of the Prior Art
A traditional jump rope mainly comprises a rope and a pair of handles. During a high-speed rope jumping, the handles held by a user do not rotate, but the rope is rotating. Under this circumstance, the rotational friction and drag are generated. These friction and drag not only damage the jump rope structure but also limit the maximum speed of rope jumping exercise.
Hence, a ball bearing attachment was invented to solve the above-mentioned problem. As shown in
FIG. 1
, it shows a ball-bearing swivel
80
(U.S. Pat. No. 2,466,243) for a jump rope structure. In which, a pair of ball bearing
81
is disposed inside. Each ball bearing
81
extends out a connecting ring
82
and further connects with a rope (not shown) or a handle (not shown). Therefore, when the rope is rotated at a high speed, the generated friction and drag will be absorbed by the low frictional ball bearing
81
. Thus, the user can achieve a high-speed rope jumping exercise.
Another jump rope structure (U.S. Pat. No. 5,749,812) was invented later, as shown in FIG.
2
. It comprises a pair of handles
91
, a rope
92
and a pair of ball-bearing swivel
93
. One end of the ball-bearing swivel
93
is disposed with a threaded portion
931
. The other end of the ball-bearing swivel
93
is disposed with a rotatable spindle
932
. Some portion of this rotatable spindle
932
extends out and connects with an O-ring
94
that is secured on one end of the rope
92
. The handle
91
has a threaded hole
911
so as to fix with the threaded portion
931
. Similarly, the ball-bearing swivel
931
basically can be rotated freely (over 360 degree). It also can reduce the rotational friction and drag between the rope
92
and the handle
91
.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a jump rope utilizing the unique ball chain design so that the rotational friction and drag during high-speed rope jumping can be significantly minimized
The second object of the present invention is to provide a jump rope device that is different to the existing patented structures.
REFERENCES:
patent: 4647037 (1987-03-01), Donohue
patent: 4801137 (1989-01-01), Douglass
patent: 5092583 (1992-03-01), Rudolf
patent: 6193637 (2001-02-01), Corbin
patent: 6544148 (2003-04-01), Loew
Donnelly Jerome W.
Rosenberg , Klein & Lee
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