Trampoline with horizontal and vertical elastic force

Details Trampoline with horizontal and vertical elastic force Trampoline with horizontal and vertical elastic force

1981-04-23

1983-06-07

Pinkham, Richard C.

Undertaking

A63B 518

Patent

active

043867723

ABSTRACT:
This invention relates to a trampoline with horizontal tension springs and vertical compression springs, characterized in that each leg has a compression spring installed in it so as to get an excellent jumping ability.
Further, the trampoline legs of this invention are detachable and its frames are foldable, as a result, its dimension after packing is reduced.

REFERENCES:
patent: 952871 (1910-03-01), Browder
patent: 2066182 (1936-12-01), Lenz
patent: 2430714 (1947-11-01), Geer
patent: 2799867 (1957-07-01), Fenner et al.
patent: 2969124 (1961-01-01), Nissen
patent: 3004623 (1961-10-01), Nissen
patent: 3677368 (1972-07-01), Green
patent: 4284271 (1981-08-01), Pettit et al.
Scientific American, Apr. 1961, DuPont MYLAR.RTM. Polyester Film.

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