US PATENT SUBCLASS 92 / 99
.~.~.~.~ With undistortable member secured to central portion of diaphragm

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

89  DF  COLLAPSIBLE CHAMBER WALL PORTION (E.G., HINGED OR FLEXIBLE WALL) {1}
90  DF  .~ Wall portion formed of flexible material {5}
96  DF  .~.~ Diaphragm type {4}
98 R  DF  .~.~.~ Entire periphery secured to rigid working chamber forming wall {4}
99.~.~.~.~ With undistortable member secured to central portion of diaphragm {1}
100  DF  .~.~.~.~.~> Member includes coextensive plate-like elements secured to opposite side of diaphragm

DEFINITION

Classification: 92/99

(under subclass 98) Apparatus including a rigid member spaced from the wall of the working chamber and coaxial with such working chamber, said rigid member being secured to a portion of the diaphragm lying inwardly of the peripheral edge thereof.