Vibrating barbell

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS The figure shows a perspective with a partial sectional view of a barbell 10 in accordance with the present invention.
Barbell 10 includes a substantially tubular-shaped barbell bar 12, on each of the two ends of which there is attached, with the intermediate placement of a first ring 14 of a cushioning material, for example, foamed plastic, a second ring 16 of a substantially rigid material such as metal i.
e.
, steel.
The second rings 16 constitute the basic weight of the barbell 10 and are fixed to the barbell bar 12.
Generally disc-shaped additional weights 18 can be attached concentrically around the second rings 16, as known from conventional barbells.
As shown by the partial sectional view, a motor 20 is mounted in a region of center of gravity within the barbell bar 12 in a turn-proof manner, e.
g.
the walls of the motor are affixed to the inside walls of the barbell bar 12.
Shaft ends 22 extend out from each end of the motor 20.
An unbalanced mass 24 is connected to each shaft end 22.
Instead of, or in addition to, the unbalanced masses 24, a rotor of the motor 20 can also be unbalanced.
All of the unbalanced masses are equal in weight and in phase with one another.
Moreover, the unbalanced masses are symmetric to the center of gravity of the barbell.
Due to this, the occurrence of rotating free mass moments, which over time would be perceived as unpleasant or uncomfortable at the users' wrist, is avoided.
The motor 20 and the unbalanced masses 24 are configured so that the bar 12 has a vibration amplitude of 1.
2 to 0.
6 mm at a frequency of 25 to 60 Hz.
The motor 20 can be supplied with power from the outside, for example, from the electrical network of the building, via a power supply cable (not shown).
In additional embodiments, the barbell bar 12 can be placed into vibration by means other than an electric motor such as electromagnetic and piezoelectric vibrators.
During operation of the barbell, when a training person lifts the barbell 10 with the motor 20 running, the musculus biceps and the musculus triceps are tensed