Method of forming an in-ear device
View Patent ↗A method for forming a device ( 10 ) that fits into a person's ear canal, that carries sound from a pipe (B) of a speaker assembly (A) into the person's ear canal, and that blocks environmental noise. A first elastomeric material ( 14 ) is molded around an elongated core ( 16 ) to form a device body ( 12 ) with an outer surface that can seal to a person's ear canal. In one method, the first elastomeric material of the body is a soft foamable material and the core is a previously-formed tube ( 16 ) of a stiffer second elastomeric material, with the body bonded to the tube by being molded around it, either in a mold cavity or by extrusion through an extrusion head. In another method, the elastomeric material of the body is a non-foam, and the core ( 96 ) is a rigid pin that is removed from the earplug body after the earplug body has at least partially solidified.
1. A method for forming an in-ear device that carries sound from a speaker into a person's ear canal while preventing almost all environmental sound from reaching the person's ear canal inner portion, comprising:
molding a foam elastomeric material around an elongated tube that has a tube axis and a tube passage extending along said axis, to form a device body with a body axis that is parallel and coincident to the tube axis, with a body outer surface of a shape to fit into and seal against an outer portion of a persons ear canal, and with said tube passage extending along said axis;
said step of molding including molding the entire length of the body around said tube;
said step of molding includes fixing the position of said tube in a closed cavity by at least one pin that has portions that fill at least opposite ends of the tube passage, filling the cavity with said foam elastomeric material and allowing the foam to solidify against the body to adhere thereto, and removing from the cavity the earplug body with the tube therein, including removing the at least one pin from the tube passage.
2. The method of claim 1 , wherein the elongated tube is elastomeric.
3. The method of claim 1 , Wherein the device body lies around said tube.
4. The method of claim 2 , wherein the foam elastomeric material of the device body bonds to the elastomeric material of the tube when the foam solidifies.
5. The method of claim 1 , wherein adhesive is not applied to hold the tube to the device body.
6. The method of claim 4 , wherein the foam elastomeric material of the device body bonds to the elastomeric material of the tube without adhesive.
7. The method of claim 1 , wherein:
the elongated tube comprises elastomeric material;
the device body lies around the tube; and
the foam elastomerie material of the device body bonds to the elastomeric material of the tube when the foam solidifies.
8. The method of claim 7 , wherein adhesive is not applied to hold the tube to the device body.
9. The method of claim 7 , wherein the foam elastomeric material of the device body bonds to the elastomeric material of the tube without adhesive.