1990-07-23
1991-05-07
Apley, Richard J.
Undertaking
272142, A63B 21055
Patent
active
050130366
ABSTRACT:
An excercise apparatus comprises a flexible, axially-resilient member having two first longitudinal sections each having a first resistance to stretching and two second longitudinal sections each having a second resistance to stretching. The first and second longitudinal sections are arranged in series with one of the first longitudinal sections at one axial end of the apparatus and the other one of the first longitudinal sections at the other axial end of the apparatus. The first and second longitudinal sections are constructed of either natural rubber or neoprene, and are in the shape of a continuous tube having a uniform outer diameter and a uniform wall thickness. Each of the first longitudinal sections is formed having at least one first longitudinal opening in the wall of the tube whereby the cross sectional area of the tube in the region of such opening is equal to a first cross sectional area; each of the second longitudinal sections is formed having at least one second longitudinal opening in the wall of the tube whereby the cross sectional area of the tube in the region of such opening is equal to a second cross sectional area which is substantially greater than the first cross sectional area, the second longitudinal sections thereby having a resistance to stretching which is substantially greater than that of the first longitudinal sections. The apparatus further comprises gripping members installed on each end of the apparatus and between each adjacent pair of the longitudinal sections.
REFERENCES:
patent: 3337215 (1967-08-01), Melchiona
patent: 4463948 (1984-08-01), Mohr
patent: 4634114 (1987-01-01), Garcia
patent: 4775149 (1988-10-01), Wilson
Apley Richard J.
Thomas L.
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