Collapsible tubular frame

Details Collapsible tubular frame Collapsible tubular frame

1993-03-16

1993-10-19

Friedman, Carl D.

Tent, canopy, umbrella, or cane

Portable shelter

Cone-shaped type

135106, 135107, E04H 1538

Patent

active

052536670

ABSTRACT:
A shrinkable tubular frame is composed of a plurality of curved tubes having the same length and curvature but different diameter for shrinking in a largest-diameter curved tube one after another so as to be become very short when being shrunk. Each two curved tubes are locked by a fixing unit when being extended out. A winding unit for winding back a rope extended in the frame so as to pull the other curved tubes, except a left one, to shrink in the left largest-diameter tube after being extended out.

REFERENCES:
patent: 2928403 (1960-03-01), Hoskins
patent: 3866619 (1975-02-01), Per Frisk
patent: 3896831 (1975-07-01), Feldman et al.
patent: 3933164 (1976-01-01), Ness et al.
patent: 4063830 (1977-12-01), Ban
patent: 4934396 (1990-06-01), Vitta
patent: 5031652 (1991-07-01), Lester

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