Acoustical tile construction

Claim 1

AN ACOUSTICAL TILE FOR ABSORBING SOUND VIBRATIONS COMPRISING, IN COMBINATION, A SUBSTANTIALLY RIGID BACKING MEMBER FORMED OF A SOUND ABSORBING MATERIAL OF A RELATIVELY LIGHT WEIGHT POROUS NATURE, SAID BACKING MEMBER DEFINING A PATTERN OF SPACED CYLINDRICAL RECESSES EXTENDING SUBSTANTIALLY INTOI SAID BACKING MEMBER AND TERMINATED BY A BASE PORTION FORMED INTERNALLY OF SAID BACKING MEMBER FOR DISPERSING SOUND VIBRATIONS WITHIN THE BACKING MEMBER, A FACING SHEET HAVING A SERIES OF OPENINGS DISTRIBUTED OVER ITS FACE IN A PATTERN CORRESPONDING TO THAT OF SAID RECESSES, SAID FACING SHEET OVERLYING AND IN CONTACT WITH SAID BACKING MEMBER SUCH THAT SAID OPENINGS ARE IN REGISTRY WITH SAID RECESSES, AND SAID FACING SHEET HAVING PORTIONS THEREOF MARGINAL TO SAID OPENINGS SMOOTHLY ROUNDED OUT OF THE PLANE OF THE FACING SHEET AND INTO THE RECESSES OF THE BACKING MEMBER TO THEREBY FORM AN INTURNED LIP AROUND EACH OPENING, EACH OF SAID INTURNED LIPS HAVING A SMALLER TRANSVERSE DIMENSION THAN SAID RECESSES COOPERATING THEREWITH TO FORM A CAPTIVE CORNER BEHIND SAID FACING SHEET TO TRAP SOUND VIBRATIONS WITHIN SAID RECESSES.