Adjustable springs for trampolines and the like

Details Adjustable springs for trampolines and the like Adjustable springs for trampolines and the like

1976-01-15

1979-07-24

Cherry, Johnny D.

Spring devices

Elastic extension devices

Tension spring

5233, 5260, 182139, 267 89, 272 65, A63B 518, F16F 112

Patent

active

041620631

ABSTRACT:
The typical helical springs used to support the bed within the frame of a trampoline or the like are modified to incorporate adjustable hooks threadedly anchored within the springs at one end so that their overall length, and thus the tension on the bed, can be varied and overstretching accommodated. Two principal versions are disclosed, the more preferred one including an additional inner spring biasing the adjustable hook to a retracted position.

REFERENCES:
patent: 1588471 (1926-06-01), Bezkorowajnyj
patent: 1641268 (1927-09-01), Halliburton
patent: 1759719 (1930-05-01), Spino et al.
patent: 2248447 (1941-07-01), Wood
patent: 3610607 (1971-10-01), Pofferi
patent: 3767009 (1973-10-01), Sidlinger

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