Measuring and testing – Fluid pressure gauge – Piston
Patent
1983-02-28
1984-09-04
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Piston
116272, 116281, G01L 716
Patent
active
044689691
ABSTRACT:
A pressure indicator, particularly for respirators, comprises a housing which has a pressure chamber, is connectable to a pressure source, for example a respirator gas pressure and includes a plurality of individual indicator chambers which is connected to the pressure chamber with an indicator piston member slidable in each of the chambers and biased by individual springs in a direction which brings a feeler portion of the indicator piston member within the housing. The feeler portion extends out of the housing in an indicating position which position is arrived at by pressure in the pressure chamber acting on the indicator piston to force it out of the housing. Each indicator piston member is biased by a biasing force, for example, produced by a selected spring so that it will be in a non-indicating position until a distinct pressure acts on the indicator piston member to force it in a position in which the feeler portion thereof extends out of the housing. The individual feeler portions of the indicator piston members are advantageously covered by a flexible covering which is provided with individual projecting portions which provide housings for the feeler members. The covering is such that the individual feelers may be sensed as being present in the projecting portions of the covering when the pressure chamber of the device has reached a predetermined pressure and forces this particular feeler into the projection.
REFERENCES:
patent: 1924633 (1933-08-01), Whittington et al.
patent: 3705535 (1972-12-01), Cohen et al.
patent: 3952284 (1976-04-01), Martin
Dragerwerk Aktiengesellschaft
Woodiel Donald O.
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