Interlocking cap and lens for indicator lights

Claim 1

IN COMBINATION WITH AN ENCLOSURE WALL OF RIGID SHEET MATERIAL AND HAVING A WINDOW OPENING THEREIN, A CAP HAVING A LIGHT TRANSMITTING FORWARD WALL AND A PERIPHERAL WALL EXTENDING REARWARDLY THEREFROM, FIRST SHOULDER MEANS ON THE PERIPHERAL WALL AND ENGAGING ONE FACE OF THE ENCLOSURE WALL WHEN THE CAP IS IN CLOSING RELATION OF THE OPENING, SNAP FASTENING SHOULDER MEANS ON THE PERIPHERAL WALL ENGAGING THE OPPOSITE FACE OF THE ENCLOSURE WALL WHEN THE CAP IS IN SAID RELATION, SAID PERIPHERAL WALL HAVING RESILIENT PORTIONS SPACED PERIPHERALLY OF THE CAP FROM SAID SNAP FASTENING SHOULDER MEANS, SAID PORTIONS BEING RESILIENTLY MOVABLE TRANSVERSELY OF THE WINDOW OPENING WHILE THE CAP IS IN INSTALLED POSITION, THE FIRST SHOULDER MEANS AND SNAP FASTENING MEANS COOPERATING TO HOLD THE CAP SECURELY IN POSITION IN SAID RELATION AND RESTRAIN IT FROM DISPLACEMENT FROM SAID POSITION, SAID LIGHT TRANSMITTING FORWARD WALL BEING VISIBLE FROM, AND DISPOSED OUTWARDLY FROM SAID ONE FACE TO THE ENCLOSURE WALL, A LENS MOVABLE INTO AN OPERATING POSITION WITHIN THE CAP WHEREIN THE LENS CONSTRAIN SAID PORTIONS FROM FLEXURE INWARDLY TRANSVERSELY OF THE OPENING AND PROJECTS LIGHTS RAYS ONTO THE FORWARD WALL OF THE CAP, INTERENGAGEABLE SNAP FASTENING MEANS, IN ADDITION TO SAID SNAP FASTENING SHOULDER MEANS OF THE CAP, ON THE LENS AND SAID RESILIENT PORTIONS OF THE CAP, RESPECTIVELY, AND OPERABLE, BY PARTIAL MOVEMENT OF THE LENS TOWARD SAID OPERATING POSITION, TO MOVE SAID RESILIENT PORTIONS APART FROM A STARTING POSITION AND THERE, UPON MOVEMENT OF THE LENS TO OPERATING POSITION, TO RELEASE SAID RESILIENT PORTIONS WHEREUPON SAID PORTIONS RETURN TOWARD SAID STARTING POSITION AND SAID INTERENGAGEABLE MEANS INTER-ENGAGE AND RETAIN THE LENS IN SAID OPERATING POSITION.