Tent – canopy – umbrella – or cane – Umbrella – Rib and stretcher joints
Patent
1997-10-16
1998-08-04
Mai, Lanna
Tent, canopy, umbrella, or cane
Umbrella
Rib and stretcher joints
135 31, A45B 2500
Patent
active
057879125
ABSTRACT:
A rib assembly adapted for use in an automatic umbrella includes: a top rib pivotally secured to an upper notch fixed on a top of a central shaft of the umbrella, a stretcher rib pivotally connected between the top rib and a runner slidably held on the central shaft, a middle rib pivotally secured between the top rib and a rear rib, and a spring rib pivotally connected between the top rib and the rear rib; characterized in that the spring rib has an inner rib portion formed with a convex spring portion overriding on a lug of a pair of lugs which are provided for pivotally connecting the middle rib with the top rib and a concave deflection portion deflecting the convex portion of the spring rib towards a U-shaped groove of the middle rib, thereby exerting spring force on the convex and concave portion for resiliently restoring the rib assembly from an unfolded state to a folded state for quickly closing the umbrella.
REFERENCES:
patent: 4658844 (1987-04-01), Ping
patent: 4966180 (1990-10-01), Lai
patent: 5063953 (1991-11-01), Wu
patent: 5193565 (1993-03-01), Huang
patent: 5235998 (1993-08-01), Liu
patent: 5337770 (1994-08-01), Wang
patent: 5392799 (1995-02-01), Lai
patent: 5536334 (1996-07-01), Yang
patent: 5645094 (1997-07-01), Wu
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