1986-02-20
1987-08-11
Apley, Richard J.
Undertaking
272130, A63B 500, A63B 2100
Patent
active
046856650
ABSTRACT:
A dual-chamber hand exerciser is constructed of thermoplastic sheet material. Two chambers provide means for exercising both of the user's hands. The chambers are squeezed alternately, shifting fluid back and forth from one chamber to the other, through a narrow passageway. The passageway is offset from the center of the device, to allow regulation of resistance to the fluid flow. The resistance regulation is accomplished by deflecting the chambers out of alignment with the longitudinal axis of the device. The regulation can be performed gradually or abruptly, at the same time the device is being used in the exercising process.
The method of manufacturing may include heat-stamping sheets of thermoplastic material, or, alternately, a tube of thermoplastic material, to avoid formation of heat seals along the sides of the chambers, and thus provide a smoother gripping surface.
REFERENCES:
patent: 1795304 (1931-03-01), Howard
patent: 3987506 (1976-10-01), Markwitz
patent: 4146222 (1979-03-01), Hribar
Apley Richard J.
Crow S. R.
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