Exercise devices – For track or field sport – Throwing
Patent
1995-02-22
1996-06-04
Grieb, William H.
Exercise devices
For track or field sport
Throwing
273424, A63B 6510
Patent
active
055227805
ABSTRACT:
A discus for throwing is provided in conformance with rules and specifications established by track and field governing bodies, such as The Athletics Congress of the USA and the International Amateur Athletic Federation. The preferred discus has top and bottom sides and a metal rim, the edge of which is circular. Each side has a metal plate set flush in the center thereof, wherein the plates are flat and circular. The sides taper in a straight line from the beginning of the curve of the rim to a circle having a radius from the center of the discus; thus, the discus is thicker in the center than at the perimeter. An imaginary equatorial plane divides the discus into top and bottom halves and is perpendicular to a central imaginary line referred to as the axis of rotation, wherein the discus rotates about the axis of rotation when thrown. The discus has an asymmetrical weight distribution between the top and bottom halves thereof. Wherefore, the preferred discus has a center of gravity biased towards the top side, which is adjacent a person's throwing hand when throwing the discus.
REFERENCES:
patent: 1006628 (1911-10-01), Burr
patent: 1433437 (1922-10-01), Wakeham
patent: 1492976 (1924-05-01), Gill
patent: 5123869 (1992-06-01), Schipmann
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