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US 6,854,466 B2Granted
Method for producing a hearing protection cup, and tool used for its production
AssigneeAB Kompositprodukter Vikmanshyttan
InventorMats Lindgren
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AssigneeAB Kompositprodukter Vikmanshyttan
InventorMats Lindgren
Estimating the term…
Tool for injection-molding a hearing protection cup which includes a curved shell with an opening for receiving an ear, and a washer which extends around the opening and is connected to the edge thereof. The washer projects inward across the opening along at least two opposite sides thereof and is intended to support a sealing and comfort ring which is intended to rest against the head. The tool includes a common mold cavity intended to produce the shell and the washer in one piece, and an insert which can be introduced into this mold cavity for forming the inner surfaces of the shell and of the washer. The insert is divided into at least three portions by means of dividing planes which extend in the same principal direction as the opposite sides of the opening. The invention also relates to a method for producing a hearing protection cup, and to a hearing protection cup produced using the method.
A method for producing a hearing protection cup which comprises a curved shell with an opening for receiving an ear, and a washer which extends around the opening and is connected to the edge thereof, and which washer projects inward across the opening along at least two opposite sides thereof and is intended to support a sealing and comfort ring which is intended to rest against the head, characterized in that the shell and the washer are produced in one piece by injection-molding of a plastic material in a molding tool with an insert which is divided into at least three portions, the dividing planes between these portions extending in the same principal direction as said opposite sides of said opening.
A tool for injection-molding a hearing protection cup which comprises a curved shell (2) with an opening for receiving an ear, and a washer (7, 8) which extends around the opening and is connected to the edge thereof, and which washer projects inward across the opening along at least two opposite sides thereof and is intended to support a sealing and comfort ring (5) which is intended to rest against the head, characterized in that it comprises a common molding cavity intended for producing the shell (2) and the washer (7, 8) in one piece, with an insert (13, 14) which is intended for forming the inner surfaces of the shell and of the washer and is divided into at least three portions, and in that the dividing planes of the insert extend in the same principal direction as said opposite sides of said opening.
A hearing protection cup comprising a curved shell (2) with an opening for receiving an ear, and with a washer (7, 8) which extends around the opening and is connected to the edge thereof and is intended to support a sealing and comfort ring (5) intended to rest against the head, characterized in that the washer projects inward across the opening only along two opposite sides thereof, and in that the shell (2) and the washer (7, 8) are produced in one piece in a common injection-molding operation.
Dependencies are inferred from the claim text.