公开(公告)号：WO1997003723A1

公开(公告)日：1997-02-06

申请号：PCT/US1996011976

申请日：1996-07-17

Applicant: NELLCOR PURITAN BENNETT INCORPORATED

Inventor： NELLCOR PURITAN BENNETT INCORPORATED ,  HANNAH, Gary, R. ,  STRATMAN, Randy, G.

IPC: A62B18/08

CPC classification number: A62B18/08

Abstract: A microphone signal attenuating breathing mask body having a gas port for inhalation of a gas to the wearer in a flow stream therethrough. A demand microphone is mounted to the mask and is coupled to an electromagnetic switch responsive to a predetermined magnetic field for switching from an actuation to an attenuation position to block transmission of sound from the microphone. An air vane is pivotally mounted on the mask body and is formed with an impingement pad positioned in the flow stream and mounts an activating magnet disposed adjacent the switch. The vane is normally disposed in a normal position such that the magnet is in an activating position and the electromagnetic switch is in the actuation position such that the microphone is active for transmission of audio signals. Upon inhalation by the wearer, the vane is responsive to the impingement of the air stream on the impingement pad to move the vane to a displaced position moving the magnet to the deactivating position, switching the switch to the attenuation position to block transmission of audio signals from the microphone.

Abstract translation: 麦克风信号衰减呼吸面罩主体，该呼吸面罩主体具有气体口，用于以穿过其中的流动流吸入佩戴者。 需求麦克风被安装到掩模上，并且响应于预定的磁场而耦合到电磁开关，用于从致动位置切换到衰减位置以阻止来自麦克风的声音的传输。 空气叶片枢转地安装在面罩主体上，并且形成有位于流动流中的冲击垫，并且安装与开关相邻设置的激活磁体。 叶片通常设置在正常位置，使得磁体处于启动位置，并且电磁开关处于致动位置，使得麦克风有效用于传输音频信号。 当穿用者吸入时，叶片响应于冲击垫上的空气流的撞击，以将叶片移动到将磁体移动到停用位置的位移位置，将开关切换到衰减位置以阻止音频信号的传输 从麦克风。