Extensible positioning device of the shank of an umbrella

Details Extensible positioning device of the shank of an umbrella Extensible positioning device of the shank of an umbrella

2001-11-14

2003-02-18

Mai, Lanna (Department: 3635)

Tent, canopy, umbrella, or cane

Umbrella

Collapsible in length

C135S114000, C135S098000, C403S109300, C403S109500, C248S188500, C248S411000

Reexamination Certificate

active

06520192

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to an extensible positioning device of the shank of an umbrella, particularly to one firmly keeping the shank at one of many adjustable positions without fail.
A conventional adjustable shank of an umbrella shown in
FIG. 1
includes an inner tube
10
and an outer tube
20
for the inner tube to telescope therein, and an eccentric fixing grip
201
located at a proper point of the outer tube
20
for compressing the inner tube
10
to keep the inner tube
10
immovable to the outer tube
20
. If the fixing grip
201
is released, the inner tube
10
can freely telescope in the outer tube
20
so as to adjust the whole length of the shank.
However, the fixing grip
201
in the conventional adjustable shank forces inward the inner tube
10
only at one point, so its compressing force may often not be enough to stop the inner tube
10
from moving after fixed, causing the inner tube move down gradually to shorten the shank.
SUMMARY OF THE INVENTION
The objective of the invention is to offer an extensible positioning device of the shank of an umbrella capable to keep an inner tube at an adjusted position relative to an outer tube firmly without possibility of the outer tube moving down to shorten the shank as the conventional one does.
The feature of the invention is an outer tube, an inner tube telescoping in the outer tube, and an adjusting cylinder and a fixing cylinder fitting around the outer tube and screwing with each other so that the adjusting cylinder may screw tightly inward the fixing cylinder so that compressing members of positioning arms of the fixing cylinder may move in holes in the outer tube and then further compress the inner tube tightly to keep the inner tube at an adjusted position relative to the outer tube.


REFERENCES:
patent: 3284114 (1966-11-01), McCord, Jr. et al.
patent: 3380097 (1968-04-01), Pharris
patent: 3722903 (1973-03-01), Jones
patent: 4277197 (1981-07-01), Bingham
patent: 4378172 (1983-03-01), Groschupp
patent: 4596405 (1986-06-01), Jones
patent: 4807837 (1989-02-01), Gawlik et al.
patent: 4948149 (1990-08-01), Lin et al.
patent: 5425225 (1995-06-01), Franco
patent: 5433551 (1995-07-01), Gordon
patent: 5649780 (1997-07-01), Schall
patent: 6142698 (2000-11-01), Nutter
patent: 336837 (1989-04-01), None
patent: 2063352 (1981-06-01), None

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