Collapsible frame structure of a sunshade or parasol

Details Collapsible frame structure of a sunshade or parasol Collapsible frame structure of a sunshade or parasol

2002-01-25

2004-02-24

Canfield, Robert (Department: 3635)

Tent, canopy, umbrella, or cane

Portable shelter

Umbrella-type

C135S098000

Reexamination Certificate

active

06694993

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an improved collapsible frame structure for use on an outdoor sunshade or parasol which is equipped with a minor extension arm coupled to a main runner of a main mast and a main extension arm in pivotal connection to a top retainer of the main mast at one end and to a lower end of a secondary stretching strut at the other end. The main extension arm and the minor extension arm are mutually coupled to each other at their middle points. The secondary stretching strut can be further pivotally coupled to an extended pivot end of either the minor runner or the top notch of the sunshade or parasol so as to permit the sunshade to be extended in an easier and smoother manner when the main runner is pushed up or pulled down.
Referring to
FIG. 1
, a conventional collapsible frame structure
1
of a sunshade or parasol is made up of a plurality of supporting ribs
10
respectively in pivotal coupling to a top notch
11
at the top end and sewn to the peripheral edge of the canopy
12
of the sunshade and parasol at the other end. The supporting ribs
10
are pivotally supported by a plurality of stretching ribs
15
which are coupled to a lower runner
13
at one end and connected to a pivot member
14
at the middle of each supporting rib
10
at the upper end. There are a main mast
16
having a main runner
160
slidable thereon, a main extension arm
17
and a minor extension arm
18
that are in cross connection to each other. The main runner
160
is in pivotal engagement with one end of the minor extension arm
18
which is in pivotal connection to the top notch
11
. There is a secondary stretching strut
19
having one end in pivotal connection to the main extension arm
17
and the other end in pivotal engagement with one of the stretching ribs
15
. Thereby the actuation of the main runner
160
can make the canopy
12
of the sunshade extended or collapsed.
Such a prior art frame structure has following disadvantages in practical operation:
1. The force exerted to the main runner
160
on the main mast
16
is directly transmitted to the secondary stretching strut
19
and one of the stretching ribs
15
linearly and not applied to the minor runner
160
, making the opening and collapse of the canopy
12
with more effort wasted in vain.
2. The secondary stretching strut
19
and its associated stretching rib
15
are subject to excessive force when pushed and pulled, resulting in easy deformation of the frame structure in operation.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an improved frame structure for use on a sunshade which is equipped with a secondary stretching strut in pivotal connection to either a top notch or a minor runner at one end and in pivotal connection to a the main extension arm at the other end. The secondary stretching strut is pivotally coupled to an extended pivot end of either the minor runner or the top notch so as to permit the sunshade or parasol to be extended or collapsed in an easier and smoother manner.
Another object of the present invention is to provide an improved frame structure which is provided with a secondary stretching strut either coupled to the minor runner or the top notch so as to make the applied force to be kept in a linear direction to prevent the secondary stretching strut and its associated stretching rib from being deformed by improper force.


REFERENCES:
patent: 3818919 (1974-06-01), Schultes et al.
patent: 5161562 (1992-11-01), Wu
patent: 5505221 (1996-04-01), Gao
patent: 6401735 (2002-06-01), Chou

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