Vertical jump exercise apparatus

Details Vertical jump exercise apparatus Vertical jump exercise apparatus

1989-05-31

1990-11-06

Green, Randall L.

Undertaking

272139, 272142, A63B 21055, A63B 2102

Patent

active

049680285

ABSTRACT:
A vertical jump exercise apparatus may be used to train and condition participants in sports demanding a high degree of vertical jumping ability. Elastic codes fastened to the waist of the user provide a nearly constant resistive force, thereby simulating increased body weight to strengthen leg muscles and to improve motor reflexes. Generation of the nearly constant force is accomplished by directing one or more of the elastic cords beneath or away from the exercise area, thus allowing use of an increased length of cord. Directional control for the jumper, cord following to prevent fouling of the cord, and reduced friction are provided by movable tracking assemblies that may pivot or move linearly and may be provided with pulleys. The tracking assemblies may also serve as force imbalance indicators for the elastic cords.

REFERENCES:
patent: 546568 (1895-09-01), Whitely
patent: 1623670 (1927-04-01), Frankenfeld
patent: 3162441 (1964-12-01), Karlik
patent: 3432163 (1969-03-01), Murphy
patent: 3561758 (1971-02-01), Huber
patent: 3687450 (1972-08-01), Schollmeyer
patent: 4371162 (1983-02-01), Hartzell
patent: 4685670 (1987-08-01), Zinkin
"Russian Leaper", Volleyball Monthly, 10/87 p. 59.

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