Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-09-06
2005-09-06
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S626000, C307S139000, C307S144000, C073S708000, C073S700000, C137S557000
Reexamination Certificate
active
06940414
ABSTRACT:
In a pressure switch, which emits an electrical switching signal as a function of the magnitude of a pressure which is supplied to it, which electrical switching signal assumes a first value when the pressure is less than the threshold value and which assumes a second value when the value is greater than the threshold value, the threshold value is adjusted—assuming that this is provided at all—by hand, for example by moving a cam disk which is coupled to a rotary knob. In order to adjust the threshold value by an electrical signal, the pressure is supplied to a pressure sensor, which emits an electrical output signal, which is a measure of the pressure which is supplied to the pressure sensor. The pressure switch is supplied with an electrical input signal which is a measure of the threshold value. The electrical output signal from the pressure sensor and the electrical input signal are supplied to a logic circuit, which emits an electrical switching signal which assumes one of two values as a function of the magnitude of the difference between the electrical signals which are supplied to it. The pressure switch is used generally for signaling on reaching a pressure which can be preselected. The pressure switch is used in particular in automation devices.
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Patent Abstracts of Japan, vol. 015, No. 251 (P-1220), Jun. 26, 1991 & JP 03 081634 A (SMC Corp), Apr. 8, 1991.
Drechsler Rainer
Lukasczyk Wolfgang
Blount Eric
Bosch Rexroth AG
Farber Martin A.
Hofsass Jeffery
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