Coil spring exerciser

Details Coil spring exerciser Coil spring exerciser

1987-12-31

1989-08-15

Apley, Richard J.

Undertaking

272135, 272137, A63B 2100, A63B 2102

Patent

active

048567760

ABSTRACT:
A dyna-bender includes an internal coil spring; an external coil spring, coaxially surrounding the internal coil spring, having an intermediate portion spaced from the internal coil spring at a predetermined distance, and two opposite end portions having diameter-reduced turns for being sleeved tightly on the internal coil spring; and two hollow plastic grips each having an open inner end which is heat pressed to sleeve tightly on one of the end portions of the external coil spring.

REFERENCES:
patent: 743204 (1903-11-01), Terry
patent: 992272 (1911-05-01), Singer
patent: 1538845 (1925-05-01), Titus
patent: 2714008 (1955-07-01), Urban
patent: 3003764 (1961-10-01), Yovanovitch
patent: 3451675 (1969-06-01), Burzenski
patent: 3552371 (1971-01-01), Kahelin
patent: 4162063 (1979-07-01), Nissen et al.
patent: 4249729 (1981-02-01), Gabrielidis
patent: 4328964 (1982-05-01), Walls
patent: 4489937 (1984-12-01), Kong
patent: 4651985 (1987-03-01), Salisbury

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