Loud speaker housing

• US 3,327,808 A
• Filed: 06/10/1965
• Issued: 06/27/1967
• Est. Priority Date: 06/10/1965
• Status: Expired due to Term

• Current Assignee: Harry B. Shaper
• Original Assignee: Harry B. Shaper
• Inventors: Shaper, Harry B.
• Application Number:
  US04/462,859
• Time in Patent Office: 747 Days
• US Class Current: 181/153
• CPC Class Codes: H04R 1/2857 for loudspeaker transducers

Claims

1. A SPEAKER SYSTEM INCLUDING AN ENCLOSURE HAVING AN OPENING MEANS VENTING TO ATMOSPHERE AND A TUBULAR SIDE WALL WITH ITS TUBULAR AXIS ENTENDING VERTICALLY;

SAID OPENING MEANS INCLUDING A FIRST AND A SECOND SECTION;

A BASS SPEAKER WITHIN SAID ENCLOSURE;

SAID SPEAKER INCLUDING A SOUND GENERATING DIAPHRAGM WHICH WHEN VIBRATED PRODUCES A FRONT WAVE AND A BACK WAVE OF REVERSE PHASE TO SAID FRONT WAVE;

SAID DIAPHRAGM OPERATIVELY POSITIONED IN PROXIMITY TO AND ABOVE SAID FIRST SECTION TO DIRECT SAID FRONT WAVE THERETHROUGH;

SAID SPEAKER POSITIONED NEAR THE BOTTOM OF SAID ENCLOSURE WITH SAID DIAPHRAGM FACING DOWNWARD;

SAID SPEAKER BEING OF A DIAMETER SUBSTANTIALLY EQUAL TO THE DIAMETER OFA SAID TUBULAR SAID WALL;

SAID FIRST SECTION COMPRISING AN ANNULUS POSITIONED;

BELOW SAID DIAPHRAGM AND CONCENTRIC WITH SAID TUBULAR AXIS;

PARTITION MEANS WITHIN SAID ENCLOSURE COOPERATING WITH THE INNER BOUNDARY OF SAID TUBULAR SIDE WALL TO DEFINE A TRANSMISSION LINE ACTING AS AN ELONGATED PATH DIRECTING SAID BACK WAVE TO SAID SECOND SECTION;

SAID SECOND SECTION DEFINED BY BOUNDARY MEANS PROVIDING A CONSTRICTION AT ONE END OF SAID PATH ACTING AS A LOW BAND PASS FILTER;

SAID PATH BEING OF A LENGTH SUCH THAT PORTIONS OF SAID BACK WAVE EMITTED THROUGH SAID SECOND SECTION ARE REVERSED IN PHASE WITH RESPECT TO THESE PORTIONS OF SAID BACK WAVE AS THEY ARE GENERATED BY SAID DIAPHRAGM WHEREBY THESE PORTIONS OF SAID BACK WAVE ARE IN PHASE WITH AND REINFORCE SAID FRONT WAVE;

SAID PATH INCLUDING A FIRST PORTION AND A SECOND PORTION CONNECTED BY A WINDOW PORTION;

SAID FIRST AND SECOND PORTIONS EXTENDING GENERALLY PARALLEL TO ONE ANOTHER.