Pneumatic transducers

Claim 1

A PNEUMATIC TRANSDUCER ADAPTED TO PRODUCE A VARIABLE OUTPUT PRESSURE COMPRISING: (A) A PNEUMATIC RESERVOIR; (B) AN INLET PORT; (C) A PASSAGE THROUGH WHICH THE INLET PORT COMMUNICATES WITH THE INTERIOR OF THE RESERVOIR; (D) A RESTRICTION IN THE SAID PASSAGE; (E) A SHARP EDGED CIRCULAR DISCHARGE PORT FROM THE RESERVOIR; (F) A CONTROL LEVER; (G) A CONTROL MEMBER IN THE FORM OF A BALL MOVABLE WITH THE CONTROL LEVER OVER A RANGE OF POSITIONS IN WHICH THE BALL BLOCKS THE DISCHARGE PORT TO DIFFERENT DEGREES; (H) AN OUTLET PORT FROM THE RESERVOIR; (I) AN INPUT MEMBER; (J) A FLAT SPRING MEMBER HAVING TWO SPACED PARALLEL OUTER LIMBS CONNECTED TOGETHER AT ONE END TO, AND EXTENDING IN THE SAME DIRECTION FROM, A TRANSVERSELY EXTENDING BASE PART, AND A THIRD INNER LIMB EXTENDING FROM THE BASE PART PARALLEL TO THE OUTER LIMBS AND IN THE SAME GENERAL DIRECTION AS THE CONTROL MEMBER, THE FREE ENDS OF THE TWO OUTER LIMBS BEING FIXEDLY MOUNTED ON THE PNEUMATIC RESERVOIR; (K) A CONNECTION BETWEEN THE INPUT MEMBER AND THE BASE PART OF THE SPRING MEMBER SUCH THAT MOVEMENT OF THE INPUT MEMBER CAUSES FLEXING OF THE TWO OUTER LIMBS ABOUT AN AXIS COMMON TO BOTH OUTER LIMBS; (L) AND A CONNECTION BETWEEN THE CONTROL LEVER AND THE CENTRAL LIMB OF THE SPRING MEMBER; WHEREBY WHEN COMPRESSED AIR UNDER A CONSTANT PRESSURE IS SUPPLIED TO THE INLET PORT THE PRESSURE IN THE RESERVOIR VARIES WITH THE POSITIONING OF THE INPUT MEMBER AND SERVES AS THE OUTPUT PRESSURE AT THE OUTLET PORT.