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Title:
CAP AND CENTER POLE APPARATUS AND METHOD OF COUPLING
Document Type and Number:
WIPO Patent Application WO/2000/059262
Kind Code:
A2
Abstract:
The present invention consists of an improved distortion reduction cap and center pole speaker assembly and an improved method of coupling the cap to a speaker center pole. The cap includes an axial flare which is stretched over and pressed into a corresponding axial gripping surface to provide a permanent coupling of the cap to a speaker center pole that does not vibrate or come loose and that eliminates air gaps between the cap and the center pole. The method of coupling the cap to the speaker center pole consists of forming the caps through known die cut stamping and forming a slightly raised corresponding axial gripping surface on the center pole of a speaker pole yoke assembly. The cap is placed over the center pole and then forced into a molding applicator tool. The mold stretches the cap vertically over the axial gripping surface while also forcing the cap against the axial gripping surface in a horizontal fashion such that the cap contacts the center pole, both above and below the axial gripping surface, to provide a secure, air tight seal.

Inventors:
Wong, Ching Tong (Tucheng Industrial Park No. 50 Chung Shan Road Taipei Hsien, TW)
Application Number:
PCT/IB2000/000347
Publication Date:
October 05, 2000
Filing Date:
March 24, 2000
Export Citation:
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Assignee:
HONG LONG INDUSTRIAL CO., LTD. (Lu Dong Industrial Zone Hu Men Zhen Dongguan City, CN)
International Classes:
H04R1/00; H04R9/02; H04R9/06; H04R11/02; H04R25/00; H04R31/00; H04R; (IPC1-7): H04R/
Foreign References:
EP0486254A21992-05-20
US5408533A1995-04-18
CN1140969A1997-01-22
EP0624048A11994-11-09
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Claims:
Claims What is claimed is:
1. A method of coupling a cap to a speaker center pole to reduce audio distortion, comprising: a. forming a cap; b. forming an axial gripping surface on a center pole having an indentation on a top surface thereof, said gripping surface extending outwardly from said center pole; c. positioning said cap over said center pole; and d. applying pressure on said cap to conform said cap to said center pole and couple said cap onto said center pole with a portion of said cap extending over said axial gripping surface to conform to said axial gripping surface and the top surface of the cap deformed to conform to said indentation.
2. A method of coupling a cap as recited in claim 1, wherein said indentation on the top surface of the center pole is frustoconical such that applying pressure on said cap to conform said cap to said center pole and couple said cap onto said center pole results in the top surface of the cap deformed to conform to said indentation.
3. A method of coupling a cap as recited in claim 2, wherein said cap comprises a planar top surface and a side wall coupled to the periphery of said planar surface, said side wall extending from the periphery of and perpendicular to said planar surface to form an open area within said cap for receiving said center pole.
4. A method of coupling a cap as recited in claim 3, wherein said cap further comprises, a flare formed adjacent the bottom edge of said side wall.
5. A method of coupling a cap as recited in claim 3, wherein said cap is comprised of a material selected from the group consisting of copper, anoxic copper, gold, silver, aluminum and composites thereof.
6. A method of coupling a cap as recited in claim 3, wherein said axial gripping surface formed on said center pole has a predetermined groove pattern which said side wall of said cap conforms to when pressure is applied to said cap.
7. A method of coupling a cap as recited in claim 4, wherein said application of pressure on said planar top surface of said cap causes said surface to stretch and conform to the frustoconical indentation of said center pole to substantially prevent formation of air gaps between said center pole and said cap.
8. A method of coupling a cap as recited in claim 4, wherein said application of pressure on said cap causes said flare of said side wall to be stretched beyond said axial gripping surface and against said center pole to substantially prevent formation of air gaps between said center pole and said cap.
9. A method of coupling a cap as recited in claim 4, wherein said application of pressure on said cap is in both the horizontal and vertical directions.
10. A speaker center pole assembly comprising: a speaker center pole having an aperture through a longitudinal axis thereof ; an annular groove formed in said aperture; a dust screen placed in said annular groove; and a retaining ring adapted to secure said dust screen within said annular groove.
11. A speaker center pole assembly as recited in claim 10, wherein said annular groove comprises a horizontal portion and an angular portion tapering upward and inward from an apex formed by said horizontal portion and said angular portion.
12. A speaker center pole assembly as recited in claim 11, wherein said dust screen is of the same general diameter as said horizontal portion of the annular groove such that the dust screen lies flat over the horizontal portion of the annular groove.
13. A speaker center pole assembly as recited in claim 10, wherein said retaining ring is a compressible ring having a free diameter greater than that of the annular groove and a compressible diameter small enough to fit through said aperture.
14. A speaker center pole assembly as recited in claim 12, wherein said retaining ring is positioned over the dust screen within said annular groove such that said ring creates a downward force by pushing against said angular portion of the annular groove thus securing the dust screen within the annular groove.
15. A distortion reduction cap applicator tool for coupling a distortion reduction cap onto a speaker center pole comprising: a housing; a mold coupled to said housing, said mold having an aperture for receiving a distortion reduction cap and a speaker center pole; a piston having a frustoconical extension for deforming a top surface of said distortion reduction cap into a corresponding frustoconical indentation in said speaker pole; and whereas said piston is adapted to eject said distortion reduction cap and said speaker center pole once said coupling is complete.
16. A distortion reduction cap applicator tool as recited in claim 15, wherein said aperture within said mold has at least two different inner diameters connecte by a portion of varying diameter.
17. A distortion reduction cap applicator tool as recited in claim 16, wherein the larger of said at least two different inner diameters initially receives said distortion reduction cap and said speaker center pole, said portion of varying diameter then receiving, and applying pressure substantially vertically and partially stretching said distortion reduction cap over said speaker center pole, and with the smaller of said at least two different inner diameters applying pressure substantially horizontally against said distortion reduction cap.
18. A distortion reduction cap applicator tool as recited in claim 15, wherein said tool applies vertical pressure through said piston which stretches the top surface of the distortion reduction cap to conform to a frustoconical indentation in the speaker center pole.
19. A distortion reduction cap applicator tool as recited in claim 15, wherein said piston is disposed within said housing having a spring positioned between said piston and said housing to allow said piston to retract and extend.
20. A distortion reduction cap applicator tool as recited in claim 16, wherein said portion of varying diameter within said aperture of said mold is conical and forms an angled surface between said at least two inner diameters extending at an angle between approximately 15 to 20 degrees in relation to the axis formed by the vertical wall of said smaller inner diameter of said aperture.
21. A method of attaching a dust screen to a to a speaker center pole to reduce audio distortion, comprising: a. forming an annular groove in a through hole within said speaker center pole; b. pressing a dust screen through said through hole until it seats flatly on said ledge of said annular groove; c. pressing a retaining ring through said through hole until it seats within said annular groove in a manner holding said dust screen in position on the ledge; and d. wherein said retaining ring applies continuous pressure on said dust screen by the compressive force of said retaining ring to securably attach said dust screen to said speaker center pole in a manner preventing contaminants from passing through said dust screen.
Description:
INTERNATIONALSEARCHREPORTtnternational application No. InformationonpatentfamilymembersPcTlIB00/o0347 PatentDocumentPublicationPatentFamily Publication EP486254A220.May*1992 US5151943 29. 09.1992 JP4268900 24. 09. 1992 DE69116317 22.02.1996 ES2089151 01,10,1996 US540853318.Arp.1995None CNI 14096922.Jan.1997US5640461 17.06,1997 SG40862 14.06.1997 BR9602281 13.01.1998 EP62404809.Nov.1994JP6319196 15.11.1994