US3902875A — Multiple filter apparatus

Claim 1

Independent Claim 382 words

MULTIPLE FILTER APPARATUS FOR USE IN A COMPRESSED AIR SYSTEM FOR REMOVING MOISTURE FROM COMPRESSED AIR SUPPLIED FROM A COMPRESSOR TO A STORAGE RESERVIOR, SAID MULTIPLE FILTER APPARATUS COMPRISING: A. A PAIR OF PARALLEL CONDUITS VIA WHICH COMPRESSED AIR MAY FLOW IN ONE DIRECTION FROM THE COMPRESSSOR TO THE STORAGE RESERVOIR AND IN A REVERSE DIRECTION, RELATIVE TO SAID ONE DIRECTION, TO ATMOSPHERE, B. A PAIR OF FILTER UNITS INTERPOSED, RESPECTIVELY, IN SAID PAIR OF CONDUITS FOR REMOVING AND ACCUMULATING MOISTURE FROM COMPRESSED AIR FLOWING THERETHROUGH IN SAID ONE DIRECTION, C. A PAIR OF CUT-OFF VALVES DEVICES INTERPOSED, RESPECTIVELY, IN SAID CONDUIT MEANS IN SERIAL RELATION BETWEEN THE COMPRESSOR AND FILTER, EACH OF SAID CUT-OFF VALVE DEVICES BEING OPERABLE TO A SUPPLY POSITION IN WHICH FLOW OF COMPRESSED AIR THROUGH THE RESPECTIVE FILTER UNIT OCCURS IN SAID ONE DIRECTON AND EACH BEING OPERABLE TO A CUT-OFF POSITION IN WHICH FLOW IN SAID ONE DIRECTION IS CUT OFF AND FLOW IN SAID REVERSE DIRECTION IS EFFECTED, D. OPERATING MEANS FOR EFFECTING ALTERNATE PERIODS OF OPERATION OF ONE OF SAID CUT-OFF VALVE DEVICES TO ITS SAID SUPPLY AND CUT-OFF POSITONS CONCOURRENTLY WITH ALTERNATE PRIOS OF OPERATION OF THE OTHER OF SAID CUT-OFF VALVE DEVICESTO ITS SAID CUT-OFF AND SUPPLY POSITIONS, RESPECTIVELY, AND VICE VERSA, E. TIMING MEANS FOR LIMITING SAID ALTERNATE PERIODS OF OPERATION TO INTERVALS OF UNIFORM TIME DURATION, F. RESPECTIVE CHOKE AND CHECK MEANS SERIALLY INTERPOSED IN EACH OF SAID PARALLEL CONDUITS BETWEEN THE RESPECTIVE FILTER, UNITS AND THE RESERVOIR TO EFFECT UNRESTRICTED FLOW OF COMPRESSED AIR IN SAID ONE DIRECTION AND TO LIMIT FLOW OF COMPRESSED AIR THROUGH FILTER UNIT IN SAID REERZSE DIRECTION TO A PRESELECTED RESTRICTED RATE, AND G. RESPECTIVE DRAIN VALVE DEVICES CONNECTED TO EACH OF SAID FILTER UNITS AND EACH BEING OPERABLE TO A CLOSED POSITION, IN WHICH THE RESPECTIVE FILTER UNIT IS CLOSED TO ATMOSPHERE, AND TO A OPEN POSTION, IN WHICH MOISTURE CONDENSATE ACCUMULATED IN THE RESPECTIVE FILTER UNIT IS EXPELLED TO ATMOSPHERE, BY SAID OPERATNG MEANS CONCURRENTLY WITH SAID ALTERMATE OPERATION OF THE CUT-OFF VALVE DEVICE CONNECTED TO ONE OF THE FILTER UNITS TO ITS SAID SUPPLY AND CUT-OFF POSITIONS, RESEPCTIVELY, AND VICE VERSA, IN REVERSE ORDER RELATIVE TO ALTERNATE OPERATION OF THE CUT-OFF AND DRAIN VALVE DEVICE CONNECTED TO THE OTHER FILTER UNIT.

Claim 2

Dependent Claim 382 words

MULTIPLE FILTER APPARATUS FOR USE IN A COMPRESSED AIR SYSTEM FOR REMOVING MOISTURE FROM COMPRESSED AIR SUPPLIED FROM A COMPRESSOR TO A STORAGE RESERVIOR, SAID MULTIPLE FILTER APPARATUS COMPRISING: A. A PAIR OF PARALLEL CONDUITS VIA WHICH COMPRESSED AIR MAY FLOW IN ONE DIRECTION FROM THE COMPRESSSOR TO THE STORAGE RESERVOIR AND IN A REVERSE DIRECTION, RELATIVE TO SAID ONE DIRECTION, TO ATMOSPHERE, B. A PAIR OF FILTER UNITS INTERPOSED, RESPECTIVELY, IN SAID PAIR OF CONDUITS FOR REMOVING AND ACCUMULATING MOISTURE FROM COMPRESSED AIR FLOWING THERETHROUGH IN SAID ONE DIRECTION, C. A PAIR OF CUT-OFF VALVES DEVICES INTERPOSED, RESPECTIVELY, IN SAID CONDUIT MEANS IN SERIAL RELATION BETWEEN THE COMPRESSOR AND FILTER, EACH OF SAID CUT-OFF VALVE DEVICES BEING OPERABLE TO A SUPPLY POSITION IN WHICH FLOW OF COMPRESSED AIR THROUGH THE RESPECTIVE FILTER UNIT OCCURS IN SAID ONE DIRECTON AND EACH BEING OPERABLE TO A CUT-OFF POSITION IN WHICH FLOW IN SAID ONE DIRECTION IS CUT OFF AND FLOW IN SAID REVERSE DIRECTION IS EFFECTED, D. OPERATING MEANS FOR EFFECTING ALTERNATE PERIODS OF OPERATION OF ONE OF SAID CUT-OFF VALVE DEVICES TO ITS SAID SUPPLY AND CUT-OFF POSITONS CONCOURRENTLY WITH ALTERNATE PRIOS OF OPERATION OF THE OTHER OF SAID CUT-OFF VALVE DEVICESTO ITS SAID CUT-OFF AND SUPPLY POSITIONS, RESPECTIVELY, AND VICE VERSA, E. TIMING MEANS FOR LIMITING SAID ALTERNATE PERIODS OF OPERATION TO INTERVALS OF UNIFORM TIME DURATION, F. RESPECTIVE CHOKE AND CHECK MEANS SERIALLY INTERPOSED IN EACH OF SAID PARALLEL CONDUITS BETWEEN THE RESPECTIVE FILTER, UNITS AND THE RESERVOIR TO EFFECT UNRESTRICTED FLOW OF COMPRESSED AIR IN SAID ONE DIRECTION AND TO LIMIT FLOW OF COMPRESSED AIR THROUGH FILTER UNIT IN SAID REERZSE DIRECTION TO A PRESELECTED RESTRICTED RATE, AND G. RESPECTIVE DRAIN VALVE DEVICES CONNECTED TO EACH OF SAID FILTER UNITS AND EACH BEING OPERABLE TO A CLOSED POSITION, IN WHICH THE RESPECTIVE FILTER UNIT IS CLOSED TO ATMOSPHERE, AND TO A OPEN POSTION, IN WHICH MOISTURE CONDENSATE ACCUMULATED IN THE RESPECTIVE FILTER UNIT IS EXPELLED TO ATMOSPHERE, BY SAID OPERATNG MEANS CONCURRENTLY WITH SAID ALTERMATE OPERATION OF THE CUT-OFF VALVE DEVICE CONNECTED TO ONE OF THE FILTER UNITS TO ITS SAID SUPPLY AND CUT-OFF POSITIONS, RESEPCTIVELY, AND VICE VERSA, IN REVERSE ORDER RELATIVE TO ALTERNATE OPERATION OF THE CUT-OFF AND DRAIN VALVE DEVICE CONNECTED TO THE OTHER FILTER UNIT.

Claim 3

Dependent Claim 57 words

Multiple filter apparatus, as set forth in claim 1, wherein one of said drain valve devices is operable to its said open position and the other to its said closed position, concurrently, in response to actuating fluid pressure, and alternately to their respective closed and open positions in response to relief of such actuating fluid pressure therefrom.

Claim 4

Dependent Claim 43 words

Multiple filter apparatus, as set forth in claim 2, wherein each of said drain valve devices is of the pressure equalizing type for automatically resuming its said closed position, subsequently to operation thereof to its said open position, after a predetermined time period.

Claim 5

Dependent Claim 59 words

Multiple filter apparatus, as set forth in claim 3, further characterized by a supply valve device having a normal vent position, in which said drain valve devices may be relieved of said actuating fluid pressure, and being operable by said operating means to a supply position in which actuating fluid pressure may be supplied to said drain valve devices.

Claim 6

Dependent Claim 184 words

Multiple filter apparatus, as set forth in claim 4, wherein said cut-off valve devices and said supply valve device are electro-magnetically operable, and said operating means comprises: a. respective solenoids for each of said cut-off valve devices and said supply valve device, said solenoids being effective, when energized, for simultaneously operating one of said cut-off valve devices to its said cut-off position, the other of said cut-off valve devices to its said supply position, and said supply valve device to its said supply position, b. said one cut-off valve device, said other cut-off valve device, and said supply valve device being operative, upon deenergization of said respective solenoids, to said supply position, said cut-off position and to said vent position, respectively; c. common electrical circuitry including an electrical energy source connected to said respective solenoids; d. electrical relay means interposed in said circuitry for effecting alternate energization and deenergization of said circuitry; and e. electrical timing means interposed in said circuitry between said relay means and said electrical energy source for effecting said alternate energization and deenergization at said intervals of uniform time duration.

Claim 7

Dependent Claim 40 words

Multiple filter apparatus, as Set forth in claim 5, wherein said electrical timing means comprises electrical contacts and resistor element interposed in said circuitry, said contacts being alternately opened and closed by alternate heating and cooling of the resistor element.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-09-01	1979-03-03	1979-09-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-09-01	1983-03-03	1983-09-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-09-01	1987-03-03	1987-09-02	$7700.00	Window Closed / Lapsed

Multiple filter apparatus

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag