Auergesellschaft Gmbh

Klaus D Dahrendorf

Peter Kling

Ulrich Noack

Ulrich Kriems

A lung-governed breathing valve used in a breathing mask for excess pressure operation. The valve has a casing with a spring-loaded control diaphragm which divides the casing into an outer chamber connected to the outside environment and a breathing chamber for conveying the gas for breathing. The control diaphragm controls a breathing gas inlet valve via a lever system and a manually released actuating button. The control diaphragm has a resilient raised portion formed integrally thereon with a recess therein. A push-rod integrally molded on the actuating button is positively engageable in the recess of the raised portion to prevent the lung-governed valve from being accidentally released or switched from the stand-by to the operative position.

Lung-governed valve

An air conveyor for a gas-sampling tube that is used for detecting foreign gases or suspended substances in air is described. The air conveyor comprises a body, serving as a handle, that has a control rod which is guided and lockable in a through-duct therein, and which is connected at one end to a bellows that serves as a suction element. The beginning and the end of the suction stroke is uniquely determined by a locking and releasing mechanism connected to the control rod thereby ensuring an exactly reproducible stroke volume. The locking and releasing mechanism utilizes two lever-like linkages, each provided with a hook, which are pivotally disposed in the body one under the other and parallel to the control rod. The free end of the control rod has at least one recess which is in operative connection with the hook on the first lever to secure the control rod in position at the beginning of a suction stroke and with the hook on the second lever to secure the control rod in position at the end of the suction stroke.

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Berlin, Germany

Klaus D Dahrendorf