Operating mechanism for umbrella

Details Operating mechanism for umbrella Operating mechanism for umbrella

2011-03-22

2011-03-22

Dunn, David (Department: 3636)

Tent, canopy, umbrella, or cane

Umbrella

Mechanically operated

C135S022000

Reexamination Certificate

active

07909049

ABSTRACT:
An operating mechanism used in an umbrella is disclosed to include a telescopic shaft, first and second screw nuts fixedly mounted in the telescopic shaft at different elevations, a third screw nut is fixedly mounted in the runner of the umbrella, a first screw rod threaded through the first screw nut, a second screw rod threaded through the second screw nut and axially slidably connected to and rotatable with the first screw rod, a third screw rod threaded through the third screw nut and axially slidably connected to and rotatable with the second screw rod, and a transmission mechanism connected to the first screw rod and operable to rotate the first screw rod.

REFERENCES:
patent: 4424824 (1984-01-01), Becher
patent: 5141010 (1992-08-01), Muller et al.
patent: 5213122 (1993-05-01), Grady, II
patent: 5291908 (1994-03-01), Grady, II
patent: 5386842 (1995-02-01), Becher
patent: 6543464 (2003-04-01), Grady, II
patent: 7562666 (2009-07-01), Chan
patent: 2010/0012164 (2010-01-01), Stoelinga

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