Pull rod structure of self-opening umbrella

Details Pull rod structure of self-opening umbrella Pull rod structure of self-opening umbrella

2001-08-14

2003-07-22

Canfield, Robert (Department: 3635)

Tent, canopy, umbrella, or cane

Umbrella

Ribs and stretchers

C135S029000, C135S022000, C135S032000

Reexamination Certificate

active

06595225

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an improved pull rod structure of a self-opening umbrella and, more particularly, to stretchers having joints, which are made of plastic material and have soft pull rods integrally formed therewith.
BACKGROUND OF THE INVENTION
FIG. 1
shows an unfolded state of a prior art self-opening umbrella. As shown in this figure, a shaft
11
a
of a general self-opening umbrella
10
a
usually has an upper nest
12
a
, a middle nest
13
a
, and a lower nest
14
a
installed thereon. A spring
15
a
is sleeved on the portion of the shaft
11
a
between the middle nest
13
a
and the lower nest
14
a
. The middle nest
13
a
joins stretchers
16
a
. Each of the stretchers
16
a
has a pull rod
162
a
thereon. Two ends of each of the pull rods
162
a
are joined on one of the stretchers
16
a
and the lower nest
14
a
, respectively. The stretchers
16
a
and the pull rods
162
a
are joined together with hinges. For this kind of joining, each of the stretchers
16
a
needs to have a joint
161
a
sleeved into one of the pull rods
162
a
. A wire penetrates through shuttle holes
1621
a
of the pull rods
162
a
and is then locked onto the lower nest
14
a
to join the pull rods
162
a
and the lower nest
14
a
together. Because the joints
161
a
and the pull rods
162
a
are made of metallic material, it is very cumbersome to form holes and grooves on the joints
161
a
and the pull rods
162
a
, to achieve joining with hinges, and to install the joints
161
a
on the stretchers
16
a
. The assembly is also inconvenient. Moreover, if subassemblies need to be replaced, the disassembly is also very troublesome.
Accordingly, the assembly of the above self-opening umbrella is difficult, the manufacture of subassemblies is very cumbersome, and the disassembly is hard if subassemblies need to be replaced. In other words, the above self-opening umbrella has inconvenience and drawbacks in practical use. The present invention aims to resolve the above problems in the prior art.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an improved pull rod structure of a self-opening umbrella to facilitate the assembly of the self-opening umbrella, and to simplify the manufacture of subassemblies thereof so that replacement of the subassemblies is very convenient.
To achieve the above object, the present invention provides an improved pull rod structure of a self-opening umbrella comprising joints made of plastic material and disposed on stretchers. Each of the joints has a soft pull rod integrally formed therewith. The other end of each of the soft pull rods has an installation end installed in a lower nest. Because the soft pull rods can be bent many times, they can substitute for a complicated pull rod structure in the prior art to simplify the assembly of a self-opening umbrella.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:


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