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Loudspeaker having a yoke, magnet, cylindrical throat, and spacer plate configuration

  • US 5,878,149 A
  • Filed: 11/05/1997
  • Issued: 03/02/1999
  • Est. Priority Date: 10/08/1993
  • Status: Expired due to Term
First Claim
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1. A loudspeaker having a yoke having a center hole, a cylindrical magnet mounted on the yoke, a cylindrical pole piece having an inner shoulder portion and mounted on the magnet, a diaphragm provided above the pole piece, and a cylindrical throat disposed in the magnet, comprising:

  • the yoke having a screw thread formed on an inside wall of the center hole;

    the pole piece having a screw thread formed on an inside wall of the shoulder portion;

    the throat having outer screw threads on an outside wall thereof at an upper portion and a low portion;

    both of the outer screw threads being engaged with the screw threads of the yoke and the pole piece, wherein the magnet is secured to the yoke and the pole piece, and wherein the outer screw threads of the low portion of the throat are in screwed engagement only with the inner screw threads of the yoke for securing the throat to the yoke.

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