Compressors of gas turbine engines

Claim 1

A COMPRESSOR FOR A GAS TURBINE ENGINE COMPRISING: A COMPRESSOR CASING HAVING A PLURALITY OF ANGULARLYSPACED APART APERTURES THEREIN, AT LEAST ONE STATOR AND AT LEAST ONE ROTOR MOUNTED WITHIN SAID CASING ON THE AXIS OF SAID CASING, A VALVE BAND ENCIRCLING SAID COMPRESSOR CASING AND ARRANGED TO SEAL AND UNSEAL SAID PLURALITY OF APERTURES, SAID VALVE BAND HAVING OPPOSITE ENDS WHICH CROSS OVER EACH OTHER, A PAIR OF SLIDER MEMBERS, ARCUATE GUIDE MEANS CIRCUMSCRIBING AT LEAST A PORTION OF SAID COMPRESSOR CASING, SAID PAIR OF SLIDER MEMBERS EACH BEING SLIDABLY MOUNTED ON SAID ARCUATE GUIDE MEANS FOR CIRCUMFERENTIAL MOVEMENT RELATIVE TO SAID COMPRESSOR CASING AND FOR SIMULTANEOUS MOVEMENT TOWARD AND AWAY FROM EACH OTHER, MEANS CONNECTING THE SAID OPPOSITE ENDS OF SAID VALVE BAND TO SAID PAIR OF SLIDER MEMBERS RESPECTIVELY WHEREBY SIMULTANEOUS MOVEMENT OF SAID SLIDER MEMBERS CIRCUMFERENTIALLY TOWARD AND AWAY FROM EACH OTHER CAUSES SAID VALVE BAND TO BE MOVED CIRCUMFERENTIALLY AND RADIALLY BETWEEN POSITIONS SIMULTANEOUSLY SEALING SAID PLURALITY OF APERTURES AND SIMULTANEOUSLY SEALING SAID PLURALITY OF APERTURES, AND POWER MEANS OPERATIVELY CONNECTED TO SAID PAIR OF SLIDER MEMBERS FOR CAUSING THE SIMULTANEOUS MOVEMENT OF SAID TWO SLIDER MEMBERS.