Catch-free safety umbrella

Details Catch-free safety umbrella Catch-free safety umbrella

1999-05-05

2001-04-17

Friedman, Carl D. (Department: 3635)

Tent, canopy, umbrella, or cane

Umbrella

Ribs and stretchers

C135S023000, C135S027000, C135S028000, C135S041000, C135S043000

Reexamination Certificate

active

06216712

ABSTRACT:

BACKGROUND OF THE INVENTION
As shown in
FIG. 31
, a conventional umbrella includes: a central shaft C having a plurality of top ribs T pivotally secured to an upper notch N on the shaft, a plurality of stretcher ribs S each pivotally connected between each top rib T and a runner R slidably held on the shaft; whereby upon opening of the umbrella, the runner R will be retained on an upper portion of the shaft by an upper spring catch C
1
resiliently held on the shaft; and upon closing of the umbrella, the runner R will be retained on a lower portion of the shaft by engaging a slot R′ formed in the runner with a lower catch C
2
resiliently held on a lower portion of the shaft.
Since either upper catch C
1
or lower catch C
2
has an acute corner portion formed on the catch, it may easily injure an umbrella user when depressing the catch for closing or opening the umbrella.
The present inventor has found the drawbacks of the conventional umbrella and invented the present safety umbrella without spring catch.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a safety umbrella including: a central shaft; a rib assembly having a plurality of top ribs pivotally secured to an upper notch on the shaft each top rib pulled by a pulling rope to be tensioned towards an upper portion on the shaft, and a plurality of stretcher ribs each pivotally connected between each top rib and a runner slidably held on the shaft, with each stretcher rib forming an acute angle between the stretcher rib and the shaft; whereby upon opening of the umbrella, the tension force as effected by the pulling rope and acting upon each top rib will be transferred to each stretcher rib to form an upwardly orienting fraction force to lift the stretcher rib along the shaft to stably hold the rib assembly at an opening state; and a ball resiliently held in a lower portion of the shaft, whereby upon closing of the umbrella, the runner will be engaged with the ball for stably retracting the rib assembly at a folded condition, thereby eliminating the acute spring catches as found in a conventional umbrella and preventing from injury to the umbrella user.


REFERENCES:
patent: 5020558 (1991-06-01), Huang
patent: 5050627 (1991-09-01), Hengtzu
patent: 5794637 (1998-08-01), Figueroa
patent: 5826678 (1998-10-01), Yu
patent: 5909746 (1999-06-01), Doster et al.
patent: 5941261 (1999-08-01), Kouvaras et al.

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