Multiple-fold umbrella having gradationally convex telescopic sh

Details Multiple-fold umbrella having gradationally convex telescopic sh Multiple-fold umbrella having gradationally convex telescopic sh

1998-07-15

2000-03-14

Friedman, Carl D.

Tent, canopy, umbrella, or cane

Umbrella

Collapsible in length

135 254, 135 75, 403377, A45B 1900

Patent

active

060358734

ABSTRACT:
A multiple-fold umbrella includes: a central shaft consisting of a plurality of tubes telescopically engageable with one another having a top or innermost tube having a smallest diameter or width and having a cross section formed with a plurality of quadrants each concave radially inwardly towards a longitudinal axis of the central shaft with at least two neighboring concave quadrants converging to form a ridge portion and a socket defined between the two neighboring concave quadrants for storing a spring catch in the socket, with the tubes gradationally curving their quadrants radially outwardly from their concave quadrants to form a lowest or outermost tube having a cross section of circular shape for a smooth holding by the umbrella user; and a rib assembly consisting of at least a top rib, a stretcher rib, an intermediate rib, an outer connecting rib and an inner connecting rib pivotally connected with one another and connected to an upper notch and a runner on the central shaft, with the inner connecting rib formed as a slim linking plate having an elongate reinforcing projection longitudinally formed on the inner connecting rib for enhancing the strength of the rib assembly.

REFERENCES:
patent: 1474821 (1923-11-01), Hartzell
patent: 2124842 (1938-07-01), Zierold et al.
patent: 4687012 (1987-08-01), Schultes et al.
patent: 4951695 (1990-08-01), Yang
patent: 5551463 (1996-09-01), Wang
patent: 5553634 (1996-09-01), Yang
patent: 5615697 (1997-04-01), Lin et al.
patent: 5641013 (1997-06-01), Wingfield
patent: 5702198 (1997-12-01), Kuo

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