Exercise devices – Isometric
Patent
1991-10-10
1993-01-05
Apley, Richard J.
Exercise devices
Isometric
482 92, 482148, 482903, A63B 2102
Patent
active
051765993
ABSTRACT:
Muscular development of an athlete is achieved for increasing the starting acceleration and stroke speed when an athlete initiates a movement stroke such as a punch from a boxer's arm, throwing a baseball pitch or kicking a football, etc. by the means and method of this invention. Thus, the initial movement of the athlete is restrained with an external force of predetermined magnitude which is released in response to the athlete's movement overcoming the restraining force. Thus, those muscles are developed which are used in initiating motion so that they deliver greater initial acceleration to attain higher stroking speed which is converted to an impact blow of greater force. An exercise machine for such muscular training provides the initial but releasable restraining force by means of two separable magnetically attracted members having the predetermined initial force adjustably varied by introducing a variable air gap distance between the magnetically attracted members. The machine is flexibly mounted on an anchored base to permit movement of the athlete in a three dimensional stroke pattern. A cord wound on a bobbin and affixed to the athlete is released from a locked bobbin position to permit substantially unrestricted movement after the initial force threshold is overcome.
REFERENCES:
patent: 518967 (1894-05-01), Poole
patent: 913799 (1909-09-01), Zund-Burguet
patent: 3861215 (1975-01-01), Bradley
patent: 3862756 (1975-01-01), Selliken
patent: 4243219 (1981-01-01), Price
patent: 4974836 (1990-12-01), Hirsch
patent: 5014981 (1991-05-01), Prelich
Apley Richard J.
Brown Laurence R.
Donnelly Jerome
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