Vertical jump exercise apparatus

Details Vertical jump exercise apparatus Vertical jump exercise apparatus

1988-06-01

1989-09-05

Apley, Richard J.

Undertaking

272139, 272136, A63B 2102, A63B 2112

Patent

active

048631639

ABSTRACT:
A vertical jump exercise apparatus to be used to train and condition participants in sports demanding a high degree of vertical jumping ability. Elastic cords 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 a pivoted tracking assembly with pulleys which also serves as a force inbalance indicator 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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