Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Reexamination Certificate
2000-06-26
2001-07-03
Barrera, Ramon M. (Department: 2832)
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
C200S08200C, C200S0830SA, C073S715000, C073S719000, C073S722000, C073S725000, C073S728000
Reexamination Certificate
active
06255609
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to pressure actuated switches and sensors, and more particularly to electric switches and sensors that do not fail or leak when exposed to very high pressures, and yet are actuated by very low pressures.
DESCRIPTION OF THE PRIOR ART
It is well known in the art of fluid pressure sensing mechanisms to employ the motion of flexible diaphragms having one face in contact with the fluid to have the opposite face of the diaphragm operate a switch or sensor. It is important to seal the diaphragm so that the fluid pressure is sensed by only one face to enable the diaphragm to respond to the pressure difference between the two faces. It is also important that device not leak fluid to the outside. There are two generally conflicting requirements of the diaphragm. It must be sufficiently flexible to respond to the pressures to be sensed. It must be sufficiently strong that it will not fail at the maximum pressures to which it will be exposed. In certain applications, quite low pressures, such as 50 P.S.I. must be sensed, and 7,500 P.S.I. may be encountered. The prior art devices have not adequately resolved this conflict.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a pressure sensing diaphragm mechanism that is responsive to very low pressures, while resistant to failures, such as leakage or rupture, at fluid pressures that are very high. The apparatus of the invention comprises a flexible diaphragm that is exposed on one face to the fluid to be measured, and that moves a sensing means with the opposite face. The diaphragm is so mounted that its maximum travel under pressure forces its entire opposite face against a rigid surface. The diaphragm is then only subject to compressive forces, that are easily supported without damage. These and other objects, features, and advantages of the invention will become more apparent when the detailed description is studied in conjunction with the drawings in which like elements are designated by like reference characters in the various drawing figures.
REFERENCES:
patent: 4049935 (1977-09-01), Gruber
patent: 4317971 (1982-03-01), Roth
patent: 4456801 (1984-06-01), Lauritsen
patent: 4637258 (1987-01-01), Priest
patent: 4827095 (1989-05-01), Clark
Blum Alvin S.
Kaylor Stephen
Samuelson Duane
Yowell Gordon
Barrera Ramon M.
Blum Alvin S.
Predator Systems Inc.
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