Method of making a speaker cone and surround assembly
US6171534A · kind A · utility
Inventors
Key dates
| Filing date | Jan 14, 1993 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Jan 14, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2231/003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of making a loudspeaker cone and surround assembly comprises clamping at least the outer marginal edge of a cone in a mold having a cavity defining a surround and injecting an elastomeric material into the cavity through an annular orifice extending substantially continuously around the said marginal outer edge to form a surround attached to the outer marginal edge of the cone. The method includes the step of feeding the elastomeric material to the annular orifice through an annular feed chamber extending around the mold cavity. The annular orifice may be narrow in width in comparison to the thickness of the surround and the method may comprise the step of separating the surround from an annular ring of sprue formed by elastomer which has solidified in or outside the annular orifice by tearing while the elastomer is still hot from the injection molding step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.