Control and signal arrangement for respirators

A control arrangement for controlling a compressed fluid respirator in which a compressed fluid is fed from a compressed fluid reservoir to a dosing valve, the arrangement comprising:

• a pressure reducing means for reducing a fluid inlet pressure from the compressed fluid reservoir to an intermediate or back pressure, a fluid pressure supply block means, receiving means provided in said supply block means for receiving said pressure reducing means including at least one first bore extending through said supply block means, said pressure reducing means being fashioned as an independent module including a housing means inserted in said at least one first bore, said receiving means and said pressure reducing means having a substantially identical cross-sectional configuration, fastening means for selectively fastening said pressure reducing means in said supply block means, said pressure reducing means including at least one radial bore terminating in a continuous groove extending around the housing means for communicating said pressure reducing means with said supply block means, said supply block means including at least one supply bore communicating with said continuous groove, at least one annular sealing means extending around said housing means for sealing said housing means in said supply block means, and an alarm means for providing a signal indicating a drop of the inlet pressure of the compressed fluid below a predetermined minimum, a further receiving means provided in said supply block means for receiving said alarm means, said alarm means being fashioned as an independent module detachably mounted in said further receiving means, said further receiving means and said alarm means having a substantially identical cross-sectional configuration, fastening means for selectively fastening said alarm means in said supply block means, said alarm means including communicating means for communicating said alarm means with said at least one bore of said supply block means.

A control arrangement for controlling a compressed fluid respirator in which a compressed fluid is fed from a compressed fluid reservoir to a dosing valve, the arrangement comprising:

• a pressure reducing means for reducing a fluid inlet pressure from the compressed fluid reservoir to an intermediate or back pressure, a fluid pressure supply block means, receiving means provided in said supply block means for receiving said pressure reducing means, said pressure reducing means being fashioned as an independent module detachably mounted in said receiving means, said receiving means and said pressure reducing means having a substantially identical cross-sectional configuration, fastening means for selectively fastening said pressure reducing means in said supply block means, said pressure reducing means including communicating means for communicating said pressure reducing means with said supply block means, said supply block means includes communication means for communicating the compressed fluid reservoir with the communicating means of said pressure reducing means, and an alarm means for providing a signal indicating a drop of the inlet pressure of the compressed fluid below a predetermined minimum, a further receiving means provided in said supply block means for receiving said alarm means, said alarm means being fashioned as an independent module detachably mounted in said further receiving means, said further receiving means and said pressure reducing means having a substantially identical cross-sectional configuration, fastening means for selectively fastening said alarm means in said supply block means, said alarm means including communicating means for communicating said alarm means with said communicating means of said supply block means.

A control arrangement for controlling a compressed fluid respirator in which a compressed fluid is fed from a compressed fluid reservoir to a dosing valve, the arrangement comprising:

• a pressure reducing means for reducing a fluid inlet pressure from the compressed fluid reservoir to an intermediate or back pressure, a fluid pressure supply block means, receiving means provided in said supply block means for receiving said pressure reducing means, said pressure reducing means being fashioned as an independent module detachably mounted in said receiving means, said receiving means and said pressure reducing means having a substantially identical cross-sectional configuration, fastening means for selectively fastening said pressure reducing means in said supply block means, said pressure reducing means including communicating means for communicating said pressure reducing means with said supply block means, said supply block means includes communication means for communicating the compressed fluid reservoir with the communicating means of said pressure reducing means, and an alarm means, further receiving means provided in said supply block means for receiving said alarm means, said alarm means including a housing means mounted in said supply block means, a double-acting piston means disposed in said housing means, a whistle means mounted on said housing means, said communicating means of said supply block means including a supply bore having branched passages communicating with said alarm means, said double-acting piston means including a large piston area facing said whistle means and a small piston area, an annular chamber means surrounding said small piston area for receiving an inlet pressure from one of said branched passages of said supply bore, a sealing means mounted on said large piston area of said double-acting piston means, said sealing means being axially displaceable to a limited extent, an annular sealing edge including a bore communicating with said whistle means, means for biasing said double-acting piston means and said sealing means in a first direction, said biasing means and the inlet pressure in said annular chamber means surrounding said small piston area maintaining said sealing means in contact with said sealing edge whereby upon a decrease in the inlet pressure in said annular chamber means the inlet pressure effective on said larger piston area from said branched passage displaces said piston means and said sealing means away from said sealing edge to activate said whistle means.

A control arrangement for controlling a compressed fluid respirator in which a compressed fluid is fed from a compressed fluid reservoir to a dosing valve, the arrangement comprising:

• a pressure reducing means for reducing a fluid inlet pressure from the compressed fluid reservoir to an intermediate or back pressure, a fluid pressure supply block means, receiving means provided in said supply block means for receiving said pressure reducing means, said pressure reducing means being fashioned as a complete functionally operational independent module detachably mounted in said receiving means, said receiving means and said pressure reducing means having a substantially identical cross-sectional configuration, fastening means for selectively fastening said pressure reducing means in said supply block means, said pressure reducing means including communicating means for communicating said pressure reducing means with said supply block means, and wherein said supply block means includes communication means for communicating the compressed fluid reservoir with the communicating means of said pressure reducing means, and wherein said pressure reducing means includes a housing means having a pressure responsive element mounted therein, a fluid inlet chamber means provided in said housing means of said pressure reducing means for receiving a fluid under inlet pressure, a pressure space means defined by said housing means of said pressure reducing means and a surface of said pressure responsive element for accommodating a fluid under a predetermined back pressure, the pressure fluid in said pressure space means acting upon the surface of said pressure responsive element to urge the same in a first direction, means for communicating said fluid inlet chamber means with said pressure responsive means, a control means for selectively controlling the communication between said inlet chamber means and said pressure space means, means for connecting said control means to said pressure responsive element so as to be displaceable therewith, means for normally biasing said pressure responsive element in a direction opposite to said first direction to maintain the communication between said first inlet chamber means and said pressure space means until the pressure in said pressure space means overcomes the force of said biasing means, and means communicating with said pressure space means for exhausting the fluid therefrom whereby the biasing means re-establishes the communication between said first inlet chamber means and said pressure space means.