Exercise devices – Skipping – Handheld jump rope
Reexamination Certificate
2001-01-31
2003-04-08
Donnelly, Jerome W. (Department: 3764)
Exercise devices
Skipping
Handheld jump rope
C482S081000
Reexamination Certificate
active
06544149
ABSTRACT:
This invention relates to skipping ropes.
Skipping ropes have been known for centuries and constitute both a children's activity plaything and a serious device for promoting health and fitness. The exercise of skipping is one which can have substantial beneficial effects. It is particularly practiced by boxers in order to build up muscle strength and tone as well as sharpening reactions.
Conventional skipping ropes consist of a length of flexible material such as rope or a plastics substitute for rope with a handle at each end.
Generally speaking, the handle is an elongate member which, if held up by the rope, extends vertically. While not absolutely necessary, most skipping ropes enable the rope to swivel about the elongate axis of the handle in order that, as the loop of rope is turned around the body of the person skipping during that activity, it does not undergo twisting.
The conventional disposition of handles and swivel mechanisms is not ideal, particularly for serious skipping, for a number of reasons:
First the holding position of the handles is somewhat awkward; with the handles held extending across the palm of the hand, and held against that by the curled fingers and the thumb, in order to position the handle horizontally and with the end from which the rope extends remote from the skipper's body, the arms must be turned outwards around their longitudinal axis. This is not particularly comfortable, compared with the relaxed position of the hands when the arms are simply allowed to hang at a person's sides, where the palms face inwards.
Secondly, the swivel mechanism introduces friction and drag which, at high skipping speeds, can be substantial.
Also, at high skipping speeds it is easy for the handle to slip axially within the hand, or even, due to the high pull from the rotating rope, slip out from the hand entirely. If slippage is compensated by the skipper attempting to shift the handle inwards, this can easily lead to the handle being moved so far in that the rotating rope then starts to chafe at the knuckles of the thumb and first finger, which is naturally undesirable.
According to the present invention, a skipping rope is characterised by having a handle at each end which consists of an elongate portion attached to one end of the rope and a portion transverse thereto at its outer end. This provides a type of “T-bar” handle, with much improved grip.
When using such a skipping rope, the transverse portion can be held easily effectively in the palm of the hand with the elongate portion extending between two fingers. This gives a much more comfortable skipping position as well as a considerably more slip-proof one, even if the hand becomes sweaty. The transverse portion of the handle nestles within the curled up fingers while the elongate portion extends between two of the fingers, usually most comfortably the first and second fingers. The effective grip on the handle is much stronger, and the distribution of forces is better configured with the base of the fingers taking the strain rather than the forefinger and thumb doing so. This can be of particular importance if the skipper does not have a strong grip, for example due to arthritis, injury or even deformity in the hand or hands. The position is much more secure, being more in the nature of a mechanical interlock than a friction grip. The hands are also held at the sides without twisting the arms, i.e. with the backs of the hands facing outwards on opposite sides of the skipper's body.
The rope is preferably attached to the handle by means of a swivel. This is preferably a low friction swivel, for example a small ball-bearing or the like, but many types of simple mechanical joint construction may be used. One possibility is to have the end of the rope pass through a bore in a ball, the end being knotted and the knot located in a counterbore to prevent it protruding form the outline of the ball. The ball may then be received in a cup of or internally coated with low-friction material mounted on the end of the elongate part of the handle remote from the transverse part. The ball may be held captive in the cup by suitable means, and may also be constrained to rotate within the cup in such a fashion that the axis of the rope lies within a certain solid angular range relative to the axis of the elongate portion of the handle. In an alternative construction, the end of the rope may be arranged to extend substantially transversely to the axis of the elongate portion of the handle. For example, the rope may be fixed at each end to a swivel collar which, via a suitable low friction bearing, is mounted on the end of the handle remote from the transverse portion.
The handles may be made of any convenient material or assembly of materials. The handle may be a unitary plastics moulding.
REFERENCES:
patent: 1436703 (1922-11-01), Fisher
patent: 3415515 (1968-12-01), Otto
patent: 5215509 (1993-06-01), Meyer
patent: 5372558 (1994-12-01), Perry et al.
patent: 2 366 848 (1978-05-01), None
patent: 161 388 (1921-04-01), None
patent: 875 750 (1961-08-01), None
patent: 2166058 (1984-03-01), None
patent: 2189160 (1987-10-01), None
patent: WO9938574 (1999-08-01), None
WPI English abstract for FR236648 (one page).
Alexandre Montagu, PC
Donnelly Jerome W.
Murphy Joseph F.
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