Piezoelectric pressure transducer

Claim 1

A PIEZOELECTRIC PRESSURE TRANSDUCER COMPRISING A CASING AND A SLEEVE CLAMPED IN SAID CASING, PIEZOELECTRIC ELEMENTS ENCLOSED IN SAID SLEEVE, A HEAD CLOSING SAID SLEEVE AT ITS PRESSURE-LOADED EXTREMITY FOR TRANSFERRING PRESSURE TO SAID PIEZOELECTRIC ELEMENTS, SAID SLEEVE BEING THINWALLED AND ELASTIC AT LEAST IN A PORTION THEREOF ENCLOSING SAID PIEZOELECTRIC ELEMENTS, A GUIDE SLEEVE ENCLOSED BYS SAID CASING AND COAXIAL WITH AND SPACED FROM SAID FIRSTMENTIONED SLEEVE, THE SPACE BETWEEN THE SLEEVES FORMING AN ANNULAR CHAMBER SURROUNDING THE THIN-WALLED PORTION OF THE FIRST-MENTIONED SLEEVE, A MEMBRANE CLOSING SAID ANNULAR CHAMBER, SAID GUIDE SLEEVE HAVING INLET AND OUTLET OPENINGS FOR THE ADMISSION AND DISCHARGE OF A COOLING LIQUID TO A FROM THE ANNULAR CHAMBER, SAID HEAD HAVING A BORE TRAVERSING SAID HEAD IN THE AREA OF THE ANNULAR CHAMBER AND SERVING FOR THE PASSAGE OF THE COOLING LIQUID, TWO AXIALLY EXTENDING AND DIAMETRICALLY OPPOSITE PROJECTING RIBS IN THE ANNULAR CHAMBER, SAID PROJECTING RIBS BEING INTEGRAL WITH THE SAID GUIDE SLEEVE BUT FREELY PROTRUDING TOWARDS THE FIRST-MENTIONED SLEEVE AND EXTENDING OVER THE ENTIRE HEIGHT OF THE ANNULAR CHAMBER, AND SAID INLET AND OUTLET OPENINGS BEING LOCATED ON OPPOSITE SIDES OF THE PROJECTING RIBS.