Shortenable umbrella

Details Shortenable umbrella Shortenable umbrella

1990-10-09

1992-09-08

Raduazo, Henry E.

Tent, canopy, umbrella, or cane

Umbrella

Self-opening and closing

135 253, A01G 1700

Patent

active

051449714

ABSTRACT:
A shortenable umbrella has a frame with three part canopy-supporting rods 1, D2, D3) which are respectively associated with two interacting parallelogram linkage (P1, P2). A corner of one linkage (P1) is provided by a pin and slot (9,9a) of which the pin passes through a diagonal (Di) of the linkage to a stable over centre position, maintained by radial tension in a canopy cover (18), when the umbrella is opened. The over centre effect is automatically released by spreading of struts (3) at the beginning of closing of the umbrella.

REFERENCES:
patent: 4077421 (1978-03-01), Schultes
patent: 4658844 (1987-04-01), Ping

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