Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1992-03-26
1994-04-19
Scott, J. R.
Electricity: circuit makers and breakers
Fluid pressure
Piston
200 82E, H01H 3538
Patent
active
053047575
ABSTRACT:
A combination differential and static pressure switch utilized in a test system for detecting the occurrence of a differential pressure condition within the test system. The test system includes a valve assembly in flow communication with the pressure switch for determining the working pressure applied to a workpiece being tested. The pressure switch includes a first tubular-shaped member and a second tubular-shaped member axially aligned therewith and adapted for removable securement to the first tubular-shaped member. A differential piston is disposed for slidable reciprocal movement within the first tubular-shaped member and a preset piston is disposed within the second tubular-shaped member and is adapted for slidable reciprocal movement therein. Both pistons are axially aligned to each other, and the differential piston has a magnet mounted to the face end thereof. An elongated passage extends substantially into and through the second tubular-shaped member and a cylindrical support member is adapted for removable and adjustable placement within the passage. A reed switch is emplaced within the support member and is actuated by the proximity of the magnetic field of the magnet. The reed switch is actuated to a signaling, conducting state when the magnetic field is proximate thereto; and when a differential pressure occurs within the test system, the differential piston backs away from the preset piston upon detecting the differential pressure, thus disposing the reed switch to a nonsignaling state indicating that the workpiece has failed the test.
REFERENCES:
patent: 3766779 (1973-10-01), Hoffman
patent: 4166936 (1979-09-01), Tice
patent: 4519256 (1985-05-01), Daniels
patent: 4962831 (1990-10-01), Dundas
patent: 5046313 (1991-09-01), Crumb et al.
Atwell George C.
Scott J. R.
Tech Team, Inc.
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