Jump rope

Details Jump rope Jump rope

1988-09-19

1990-01-02

Crow, Stephen R.

Undertaking

446236, A63B 520

Patent

active

048908290

ABSTRACT:
A jump rope or similar article that can also be made into a hoop form. The article is made of materials that exhibit some stiffness and is measured as a preferred elastic modulus of approximately 26,000 p.s.i., which is roughly midway between the range of 18,000-30,000 p.s.i. The article which also exhibits a Shore A hardness of between 50 and 90 may be made from a core with spirally wound overlays treated to impart the necessary stiffness. The article has end portions that permit the joining of the ends so as to form a hoop form.

REFERENCES:
patent: 1509491 (1924-09-01), Sawyer
patent: 2161819 (1939-06-01), Katz
patent: 3319220 (1968-04-01), Kiuchi et al.
patent: 3325990 (1967-06-01), Laureti
patent: 3415515 (1968-10-01), Otto
patent: 4496146 (1985-01-01), Jackemeyer
patent: 4735035 (1988-04-01), Mattioli

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