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Double tapered article
| Details |
Inventors: Held, Richard A.;
Assignee: Gill Athletics, Inc. (Urbana, IL)
Primary Examiner: Dawson; Robert
Assistant Examiner: Keehan; Christopher M.
Attorney, Agent or Firm: Cook, Alex, McFarron, Manzo, Cummings & Mehler, Ltd.
A method of forming a molded article and a molded article itself having a passage therein which has a cross-sectional dimension adjacent an end which is less than at a location which is spaced from the end are disclosed. In the method an elongate, rigid mandrel is covered over a substantial portion of its length with a flexible mandrel. The flexible mandrel, when covering the rigid mandrel, has an exterior surface which has a cross-sectional dimension which is less adjacent an end thereof than at a location which is spaced from that end. The flexible mandrel is then covered with a material which is to form the molded article with the rigid and flexible mandrels defining the mold about which the article is formed by the material. The material is then set to form the molded article about the mandrels with the mandrels defining the passage in the molded article. The mandrels are then removed from the molded article from the end of the passage which has a cross-sectional dimension which is less than at the location which is spaced from that end. |
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DETAILED DESCRIPTION The present invention relates to a method of forming a molded article and, more particularly, to a method of forming and a molded article having a passage therein which has a cross-sectional dimension adjacent an end which is less than at a location which is spaced from that end.
Double tapered articles are known in which the cross-sectional dimension of the article, e.
g.
the diameter, decreases toward each of the ends.
These are typically articles of metal or other materials which are formed by grinding or sanding the ends of a rod to define the decreasing cross-sectional dimension and/or by compressing or swaging a tube toward one or both of its ends to form at least one and sometimes opposite tapered ends.
Such compressing or swaging of tubing is, for example, disclosed in my U.
S.
Pat.
No.
3,274,816.
In certain circumstances it would be advantageous to form an elongate one piece shaft by the molding of a composite polymeric material about a mold and in which the mold, and hence the passage in the shaft which remains after the removal of the mold, has a double taper, e.
g.
is tapered toward each end.
However, this previously has not been possible because it was not possible to remove the mold about which the shaft was formed once the polymeric material used to form the shaft has been set or cured.
This is because the cross-sectional dimensions at the tapered ends of the passage which is formed by the mold are smaller than in between the ends and, therefore, block the movement of the mold, which has a larger cross-sectional dimension between its ends, out of the passage.
Such shafts of varying internal cross-sectional dimensions would be highly desirable, for example, in a javelin where the cross-sectional dimensions of both the interior and exterior of the shaft desirably vary over the length of the javelin for proper weight, balance and flexing qualities.
This problem has been solved in the present invention.
The present invention makes it possible to form a one piece, molded, polymeric shaft having a passage therethrough which is formed by the mold, and which varies in cross-sectional dimension over its length so that these dimensions are less at the ends of the shaft than at a location spaced from the ends
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Exercise Devices 
