Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Reexamination Certificate
2000-10-26
2002-06-04
Kuhns, Allan R. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
C264S328700
Reexamination Certificate
active
06398996
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a footwear sole that has air chambers defined therein by moving movable members in the cavity of the mold during foaming process.
BACKGROUND OF THE INVENTION
A conventional footwear sole
10
with a cushion member
13
received therein is shown in FIG.
1
and the cushion member
13
is received in a heel portion of the sole
10
. The cushion member
13
is a bladder which is made independently from the process of making the sole
10
and the sole
10
has to be provided with a recess so that the cushion member
13
is received in the recess. Air or oil is filled in the cushion member
13
so that it is deformable and absorbs kinetic energy to provide a comfort during jogging or walking. For the manufacturers, the combination of the cushion member
13
and the sole
10
requires too many processes and different materials and related machinery.
The present invention intends to provide a method for making a footwear sole that is made of single material and has air chambers defined in the sole during foaming processes.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a footwear sole having air chambers defined therein wherein the sole is made from a single foamable material and the air chambers are defined during foaming process in a mold.
The primary object of the present invention is to provide a single-material footwear sole that has air chambers defined therein.
Another object of the present invention is to provide a method for making the sole having air chambers defined therein during foaming process in a mold.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
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Baxley Charles E.
Jiunn Long Plastic Co., Ltd.
Kuhns Allan R.
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