Hearing protective device and method of making the same
View Patent ↗A hearing device including a foam, a foam insertable portion, a component, and a foam handle portion, and a method of forming the same. The component is nestable with and bondable with the foam such that the component is at least partially within the foam insertable portion and the foam handle portion. The hearing protective device includes earplugs attached to a flexible cord, under-the-chin element, or headband. A method of making a hearing protective device including disposing a component into a mold, introducing a foam or foamable mixture into the mold, causing the foam to rise such that the component is nested within and bonded with the foam.
1. A method of making an earplug comprising:
disposing a component within a mold, wherein the component includes an outer surface delimiting a tortuous path for venting the mold;
introducing a foam or foamable mixture into said mold; and
causing said foam or said foamable mixture to rise about said component such that said component is nested within and bonded with said foam, such that said component is at least partially within a foam insertable portion and at least partially within a foam handle portion, said foam handle portion having a smaller diameter than the foam insertable portion.
2. The method of claim 1 , wherein said foam or said foamable mixture is self-rising.
3. The method of claim 1 , wherein said foam is selected from the group comprising polyurethane, acrylic, acrylic blends, and mixtures and combinations thereof including at least one of the foregoing materials, and wherein said component is selected from the group comprising plastic, paper, dense paper, foam, porous foam, stiff foam, semi-stiff foam, cardboard, rubber, and combinations thereof including at least one of the foregoing materials.
4. The method of claim 1 , further comprising forming a depression in said foam along said component.
5. The method of claim 1 , further comprising providing a passage in said component.
6. The method of claim 1 , wherein the outer surface of the component comprises a screw threaded portion or a knurled portion.
7. The method of claim 6 , wherein a venting passageway extend from an interior of the mold to an exterior of the mold.
8. A method of making an earplug comprising:
disposing a component within a mold, wherein the component includes an outer surface delimiting a tortuous path for venting the mold;
introducing a foam or foamable mixture into said mold;
causing said foam or said foamable mixture to rise about said component such that said component is nested within and bonded with said foam, such that said component is at least partially within a foam insertable portion and at least partially within a foam handle portion, said foam handle portion having a smaller diameter than the foam insertable portion;
venting the mold during said rising of the foam or foamable mixture to allow a gas to move from an interior of the mold to an exterior of the mold; and
sealing said interior of said mold from said exterior after said venting.
9. A method of making an earplug comprising:
disposing a component within a mold, wherein the component includes an outer surface delimiting a tortuous path for venting the mold;
introducing a foam or foamable mixture into said mold;
causing said foam or said foamable mixture to rise about said component such that said component is nested within and bonded with said foam, such that said component is at least partially within a foam insertable portion and at least partially within a foam handle portion, said foam handle portion having a smaller diameter than the foam insertable portion;
venting the mold during said rising of the foam or foamable mixture to allow a gas to move from an interior of the mold to an exterior of the mold; and
sealing said interior of said mold from said exterior after said venting;
wherein said sealing comprises allowing a volume of said rising foam or foamable mixture to enter a vent used in said venting and curing said volume therein.