Amusement devices – Illusion or stage device – Stage apparatus or setting
Patent
1980-05-09
1984-12-25
Hafer, Robert A.
Amusement devices
Illusion or stage device
Stage apparatus or setting
A63B 520
Patent
active
044899343
ABSTRACT:
A jumping rope for exercising including extendible handles for adjustably altering the moment of force imposed by the swinging rope. The jump rope construction includes evenly extended handles at each end thereof, the extendible handles comprised of a series of sections which can shorten or lengthen the distance between the user's hands and a ball bearing assembly within which the rope is secured. The rope is joined to the first handle section by a ball bearing assembly which is recessed from the handle shoulder. The first section is a terminal coupling and has a tapered cross-section at the shoulder thereof to reduce the friction between the rope and the shoulder of the handle section. The opposite end of the receiving handle section is joined to a mating extension which can be easily gripped by the user. The extended member can be coupled to an additional extension section to lengthen the handle and thereby extend the distance between the user's hand and the point at which the force of the swinging rope will be applied to the handle.
REFERENCES:
patent: D73755 (1927-11-01), Mordt
patent: 932331 (1909-08-01), Russell et al.
patent: 1189307 (1916-07-01), Stokes et al.
patent: 1505473 (1924-08-01), Klubnick
patent: 1714391 (1929-05-01), McWhirter
patent: 2947108 (1960-08-01), Dodd, Jr. et al.
patent: 3380738 (1968-04-01), Papp
patent: 3421253 (1969-01-01), Thurston
patent: 3762704 (1973-10-01), Gingras
patent: 4179119 (1979-12-01), Wolf
Hafer Robert A.
Kramer Arnold W.
Painter Michael A.
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