Weight lifting machine

Details Weight lifting machine Weight lifting machine

1980-02-19

1982-11-09

Pinkham, Richard C.

Undertaking

272136, 272140, A63B 2106

Patent

active

043581072

ABSTRACT:
A weight lifting machine substitutes a noncumulative force or constant tension type spring for some of the individual weights with which the machine would otherwise be equipped, the tension required to unwind the spring being equal to the sum of the omitted weights. The remaining individual weights function as before but when additional resistance, greater than their sum, is wanted, the spring is connected into the lifting mechanism.

REFERENCES:
patent: 1139126 (1915-05-01), Kerns
patent: 3905599 (1975-09-01), Mazman
patent: 4208049 (1980-06-01), Wilson

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