Collapsing mechanism of automatic fourfold collapsible umbrella

Details Collapsing mechanism of automatic fourfold collapsible umbrella Collapsing mechanism of automatic fourfold collapsible umbrella

1999-03-23

2000-12-26

Friedman, Carl D.

Tent, canopy, umbrella, or cane

Umbrella

Collapsible in length

135 23, 135 31, A45B 1910

Patent

active

061643025

ABSTRACT:
The present invention relates to a collapsing mechanism of automatic fourfold collapsible umbrellas, especially to an umbrella structure in which a restoring spring is disposed in a second parallelogrammatic frame set. The restoring spring can exert enough forces to quickly retract umbrella stretchers and ribs when an umbrella is collapsed. Thus the collapsing mechanism according to the invention can rapidly and smoothly pull down a fourfold collapsible umbrella.

REFERENCES:
patent: 5235998 (1993-08-01), Liu
patent: 5337770 (1994-08-01), Wang
patent: 5551463 (1996-09-01), Wang
patent: 5617889 (1997-04-01), Wu
patent: 5626161 (1997-05-01), Lin et al.
patent: 5787912 (1998-08-01), Wu
patent: 6016822 (2000-01-01), Lin et al.

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