Resistance device for a gymnastics apparatus

Details Resistance device for a gymnastics apparatus Resistance device for a gymnastics apparatus

1974-03-11

1976-03-16

Shapiro, Paul E.

Undertaking

A63B 2100

Patent

active

039442217

ABSTRACT:
Resistance device for a gymnastics apparatus, comprising an air cylinder and a piston which is movable inside the cylinder. The device is provided with non-return valves in such a manner that, during repeated relative movement of the piston in the cylinder, the air pressure in the device and, thereby, resistance to movement of the piston increases successively.

REFERENCES:
patent: 767008 (1904-08-01), Pelletier et al.
patent: 3471145 (1969-10-01), Berger
Coleman Camp Stove, Sears Catalog, 1969, p. 862.

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