Carrying case construction

Claim 1

A CARRYING CASE FOR INSTRUMENTS, ARTICLES AND THE LIKE, COMPRISING TWO SECTIONS, HINGE MEANS PIVOTALLY CONNECTING SAID SECTIONS, EACH SECTION HAVING AN OUTER SHELL FORMED BY A PANEL AND FOUR WALLS JOINED TO ONE ANOTHER AND TO SAID PANEL, AND WALLS HAVING A STRAIGHT MARGINAL EDGE, A SUBSTANTIALLY RIGID FRAME SECURED TO SAID WALLS AND HAVING A BODY AND TWO MEMBERS CONNECTED TO SAID BODY AND EXTENDING ALONG THE INTERNAL AND EXTERNAL SIDES OF THE MARGINAL EDGES OF SAID WALLS, A LIP ON THE INNER MEMBER WITH A SHARP EDGE FOR ENGAGING THE ADJACENT WALL FOR SECURING SAID FRAME ON THE WALLS, A FLANGE ON SAID FRAME FORMING AN INWARDLY EXTENDING SHOULDER, A FLEXIBLE INNER SHELL FORMED BY A CONTOURED PANEL AND FOUR WALLS JOINED TO ONE ANOTHER AND TO SAID PANEL, SAID PANEL HAVING PROTRUSIONS THEREON FOR URGING SAID SHELL TOWARD THE FLANGE ON SAID FRAME FOR ENGAGING THE INNER SURFACE OF SAID OUTER SHELL AND HOLDING THE INNER SHELL IN SPACED RELATION TO SAID OUTER SHELL, LINER MATERIAL ON THE SURFACE OF AND INNER SHELL, A YIELDABLE OUTWARDLY EXTENDING FLANGE ON THE MARGINAL EDGE TO THE WALLS OF SAID INNER SHELL, AND SPACED LUGS ON SAID LAST MENTIONED FLANGE FOR SNAPPING BENEATH THE SHOULDER ON SAID FRAME FOR HOLDING SAID INNER SHELL IN PLACE IN SAID OUTER SHELL AND CLAMPING THE MARGIN OF SAID LINER.