Tent – canopy – umbrella – or cane – Umbrella – Collapsible in length
Patent
1997-04-15
1998-02-24
Mai, Lanna
Tent, canopy, umbrella, or cane
Umbrella
Collapsible in length
135 254, 135 75, A45B 1900
Patent
active
057203113
ABSTRACT:
A telescopic umbrella shaft includes at least an inner tube, and an outer tube telescopically slidably engageable with the inner tube, with each tube having a cross section of hexagonal shape consisting of six arcuate rectangular sides each arcuate rectangular side concaved inwardly towards a longitudinal axis of the shaft, and every two neighboring arcuate rectangular sides converging to form a reinforcing rib convex outwardly from the longitudinal axis, with each reinforcing rib formed as an inversed-U shape and having a longitudinal strip defining a horizontal plane perpendicular to a normal line between the longitudinal axis and an apex intersected by the two neighboring arcuate rectangular sides of the tube, thereby forming a balanced moment of inertia of the concave and convex portions of the tube when dynamically rotating the central shaft for greatly enhancing the stability and strength of the umbrella shaft.
REFERENCES:
patent: 2165967 (1939-07-01), Haupt
patent: 4687012 (1987-08-01), Schultes et al.
patent: 5178174 (1993-01-01), Wu
patent: 5267583 (1993-12-01), Wu
patent: 5505222 (1996-04-01), Lin et al.
Chang Jung-Jen
Lin Chung-Kuang
Fu Tai Umbrella Works Ltd.
Mai Lanna
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