Alarm device for respirators
AssigneeDragerwerk Aktiengesellschaft
InventorLeslie F. Boord
Life of this patent
Estimating the term…
Abstract
The dropping of pressure for the gas supply in respirators, below a minimum pressure, is reported to the wearer by an acoustic alarm device. To make it possible for the wearer to check whether a warning signal heard comes from his own equipment or not, it is provided that the alarm device has a manipulator which adjusts the sound-generating region.
Claims6
An alarm device device for respirators having alarm means for supplying a flow of gas when the pressure of a gas supply in the respirator falls below a selected value, comprising a receiving connection for receiving the flow of gas from the alarm means, a signal whistle connected to said receiving connection for receiving the flow of gas and generating a whistle signal thereupon, said whistle further comprising a whistle sleeve, at least a portion of which is mounted for movement relative to said receiving connection, said whistle sleeve having a gas outlet opening for the passage of the whistle signal, said receiving connection having a portion which, with movement of said portion of said whistle sleeve, at least partially blocks said gas outlet opening to change said whistle signal, whereby a wearer of the respirator after hearing the whistle signal can manually move said at least one portion to change the whistle signal and verify that the whistle signal is coming from the wearer's alarm device when said wearer is among a plurality of wearers of similar alarm devices.
An alarm device for respirators having alarm means for supplying a flow of gas when the pressure of a gas supply in the respirator falls below a selected value, comprising a receiving connection for receiving the flow of gas from the alarm means, a signal whistle connected to said receiving connection for receiving the flow of gas and generating a whistle signal thereupon, and manipulator means having at least one part movable with respect to said receiving connection to change said whistle signal, said whistle further comprising a sleeve fixed to said receiving connection and having a gas outlet opening, a reed connected to said sleeve and engageable at least partly over said gas outlet opening, said sleeve vibrating with the flow of gas for generating said whistle signal, said manipulator means comprising adjustable stop means engageable with said reed for changing said whistle signal, whereby a wearer of the respirator after hearing the whistle signal can manually move said at least one part to change the whistle signal and verify that the whistle signal is coming from the wearer's alarm device when said wearer is among a plurality of wearers of similar alarm devices.
Dependencies are inferred from the claim text.