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Molded article having elastomeric mold member used therewith
| Details |
Inventors: Packard, Thomas J.; Quackenbush, James H.;
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Examiner: Fuller; Benjamin R.
Assistant Examiner: Le; Nancy
Attorney, Agent or Firm: Griswold; Gary L., Kirn; Walter N., Hornickel; John H.
This invention relates to the use of a flexible, heat resistant mold member. The mold member is useful in molding processes such as dip or slush molding. The mold member maintains its structural integrity and may therefore be used as an insert in the article being molded to provide flexible stability at specific locations within the article. The mold member is made of a material which is substantially non-reactive with the molded article. The molded article may be any article made from a plastisol such as a binaural for a stethoscope having single or double lumens. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention may be used to make a wide variety of molded articles which may have internal cavities, bores, or voids therein, either for positioning other components therein, (such as springs or the like) or for transmitting sound, maintaining air or gasses, or moving or storing liquids.
By way of example, not by way of limitation, the variety of such molded articles may include traffic cones, fishing buoys or markers, industrial cable sheathing, and the like.
The present invention has particular utility in making stethoscopes and thus the following detailed description describes stethoscopes.
However, the invention is not limited to stethoscopes, or the particular alternate constructions of stethoscopes.
For example, the stethoscope may have monaural or binaural tubing or may have either single or double lumens as passageways without the departing from the scope of this invention.
Referring to FIG.
1, a molded article 40 is illustrated, which is a stethoscope within the scope of the present invention having in one preferred embodiment a flexible, heat resistant member 18 embedded therein at a yoke junction 44 of a binaural 42 having double lumens 34 and 36 terminating in a bottom edge 32.
In this preferred embodiment, member 18 has optionally remained embedded in the article 40 after completion of the molding and demolding processes as seen through the progression of FIGS.
2-4.
However, it is within the scope of the present invention to provide a molded article having any shape of internal cavity or bore which matches the shape of the removable portion of the mold or matches the shape of the optionally removable member 18.
For example, a leaf spring cavity 38, cavities for ear tubes 46 and 48, and lumen cavities 34 and 36 match the shape of the removable portions of a mold, whereas the cavity at yoke junction 44 matches the shape of the member 18 optionally remaining in the article 40 after demolding of the separable portions of the mold
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Gutter-related 
