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Publication numberUS2669707 A
Publication typeGrant
Publication dateFeb 16, 1954
Filing dateApr 29, 1950
Priority dateApr 29, 1950
Publication numberUS 2669707 A, US 2669707A, US-A-2669707, US2669707 A, US2669707A
InventorsFrederick S Ehrman
Original AssigneeBowser Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Filter signal
US 2669707 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Feb. 16, 1954 s, EHRMAN 2,669,707

FILTER SIGNAL Filed April 29, 1950 Raf FREDERICK 5. E HRMHN INVEN TOR.

ATTORNEY Patented Feb. 16,1954 la:

Frederick S. Ehrman, Fort Wayne, Ind., assignor to Bowser, Inc., Fort Wayne, Ind., a corporation of Indiana Application April 29, 1950, Serial No. 159,053

This invention relates to a filter signal. More specifically, it relates to a signal which is displayed when the filter requires attention;

It is a well known fact that filters employing a filter cartridge, such as those used for cleaning plugged to the extent that liquid is being bypassed around the filter. V

Another object of the invention is to provide a signal which is simple and inexpensive.

A further object is to provide a signal which may be reset when the cartridge has been changed.

These and other objects will become apparent from a study of this specification and the drawing which is attachedhereto and made a part hereof, and in which:

The single figure is an elevation in section with parts broken away to show the by-pass valve.

The numeral i represents a filter case having an inlet 3 and an outlet 5. The case is in two parts 6, l which have mating flanges 9, H held together by suitable fasteners [3.

The outlet in part I is provided with a suitable outlet tube i5 on which a head ii is slidably mounted and sealed by a ring it disposed in groove 20.

The part 5 is provided with a fitting l9 having a stem 2| screwed into it. This stem includes a projection 23 which enters and guides the upper head 25, and a shoulder 21 which bears on a gasket 29 to seal the upper head and stem.

A filter cartridge 30 of any suitable type is sealingly held between the heads, preferably by a spring 3|.

The projection 23 has a passage 33 which communicates at its upper end with an inlet passage in the stem and at its lower end with a by-pass chamber 31.

A magnet chamber 33 is formed in the stem above passage 33, preferably in axial alignment with 35 and 31, and has its lower end closed by a non-magnetic diaphragm M. The stem is preferably also non-magnetic.

A valve 43 is mounted in valve chamber 31 and has a stem 45 which projects through passage 33 to a point closely adjacent the diaphragm where it terminates in an armature 41 disposed 4 Claims. (01. 240439) parallel to and closely adjacent the diaphragm. A spring 49, disposed in the chamber 37, rests on a pin 5| and urges the valve 43 closed.

'A magnet 53 is slidably mounted in the chamber 39 and has a rod 55 which extends outwardly through the stem and supports at its upper end the signalbutton 57. A spring 59 which bears on the stem and button normally urges the but-'- ton, rod and magnet upwardly.

A housing 6| having sight openings 53 which may be covered by a transparent insert tube 65, enable the position of the indicator button to be determined. This housing may be frictionally engaged with a boss 61 on the stem.

Operation Liquid entering the inlet 3 normally passes through the filter cartridge and out the outlet tube l5 and outlet 5. When the filter becomes substantially impervious due to the accumulation of impurities removed from the liquid, the liquid will by-pass the cartridge by entering conduits 35, 33, will displace the valve 43 against the opposition of spring 49 and pass through chamber 37, tube 15 to outlet 5.

When the valve is thus displaced, it will draw the armature away from magnet 53 so as to reduce the force holding the magnet in place. The spring 59 overcomes this force and moves the magnet, rod 55 and signal 51 upwardly so that the latter is visible in the windows 63.

The operator perceiving the signal, knows that the cartridge should be replaced. He then shuts the required valves (not shown), removes the fasteners l3 and cover 6, removes head 25 and the filter cartridge. He will then replace the cartridge with a clean one, replace the parts mentioned above and the filter is again ready for operation. He will next remove the housing 6|, push the indicator down until the magnetic force on the armature is great enough to overcome the spring 59 so that the indicator will be held down out of sight.

The valves may be opened and the filter restored to service.

It is obvious that various changes may be made in the form, structure and arrangement of parts without departing from the spirit of the invention. Accordingly, applicant does not desire to be limited to the specific embodiment disclosed herein primarily for purposes of illustration; but instead, he desires protection falling fairly within the scope of the appended claims.

What I claim to be new and desire to protect by Letters Patent of the United States is:

1. In a filter comprising a filtering medium, the

combination of a signal having inefiective and signalling positions, means for urging said signal toward signalling position, means normally holding said signal in ineffective position, a normally closed valve means, disposed so as to be opened by the increase in pressure resulting from substantial clogging of the medium, for by-passs l quid round sa d me m and means onerated bysaid valve means for releasing said holding means.

2. In a filter comprising a filtering medium, the combination of a signal having inefieotive and signalling positions, means for urging said signal toward signalling position, means normally holding said signal in ineffective position, a nor mally closed valve means, disposed so as to be opened by the increase in pressure resulting from substantial clogging of the medium, for by-passing liquid around said medium, an armature connected to be operated by said valve means, a magnet, a si nal m u ed fo movement between in v an s gna in pos tions, means urging i s gn l towa d si nall n p si ons, said armat e in di posed os ly adiaeent the magn t. when the valve is closed, so that t e m n t for will overcome the ur in means and be ng c nnected to be moved away from said mag wh n e valve is open d so that the r s m ns will vercome he ma n tic for e- '1 :3. In a liter comprisin a f te ing medium. th combinat n f a s nal avin in fiectlv and si nalli g p s tions, means for urging said sign l t wa d s nall n position, means normall holding said signal in ineffective position, a normally closed valve means, disposed so as to be opened by the increase in pressure resulting from substantial clogging of the medium, for by-pass- .ing liquid around said medium, an armature connected to be operated by said valve means, a magnet, a non-magnetic diaphragm disposed between the armature and magnet, a signal mounted for movement between inefiective and signalling positions, means urging said signal toward signalling position, said armature being disposed closely adjacent the magnet, when the valve is closed, so that the magnetic force will overcome the urging means and being connected to be moved away from said magnet when the valve is opened so that the urging means will overcome the magnetic force.

i, n a fi t r c pr si g a filterin m d um, the combination of a signal having inefieotive and signalling positions, means for urging said signal toward signalling position, means normally holding said signal in inefiective position, a normally closed valve means, disposed so as to be opened by the increase in pressure resulting from substantial clogging of the medium, for by-passing liquid around said medium, a signal mounted for movement between ineffective and signalling positions, a magnet and an armature mounted closely adjacent each other for movement with said valve and signal, means mounting said valve means for movement, and means operated by the valve to separat said armature and magnet, means ior urging said signal toward signalling position, said urging means exerting less force than s d ma ne and armature When the latter are close proximity and exerting greater force than the magnet and armature when the latter a e s par ted b a p det rmined amount, w r by s d s nal is moved to signallin position wh the a ve. m a s moved a distance sufficient to separate said armature and signal by said m unt.

S. EHRMAN.

References Cited in the file of this patent UIH'I'ED S ATES PATENTS

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2757801 *May 5, 1953Aug 7, 1956Ewald MuggliSignal devices for filters
US2878936 *Apr 5, 1957Mar 24, 1959Purolator Products IncFilter unit
US2921157 *May 26, 1955Jan 12, 1960Bacharach Ind Instr CompanyFilter gauge
US2936731 *Jul 21, 1958May 17, 1960Nils O RosaenIndustrial oil filter control unit
US2942572 *Jun 17, 1958Jun 28, 1960Pall CorpMagnetic pressure indicator
US2954751 *May 9, 1958Oct 4, 1960Bendix CorpVisible filter clogging indicator
US3011470 *Mar 18, 1960Dec 5, 1961Thompson Ramo Wooldridge IncPressure change indicator
US3040894 *Jul 12, 1960Jun 26, 1962Pall CorpFilter
US3042076 *Jan 27, 1959Jul 3, 1962Purolator Products IncFilter signal device
US3043262 *Mar 24, 1959Jul 10, 1962Purolator Products IncMagnetic filter signal device
US3045826 *Jul 28, 1958Jul 24, 1962Permanent Filter CorpFilter device
US3070232 *Oct 1, 1959Dec 25, 1962Purolator Products IncFilter unit with signal device
US3077854 *Feb 29, 1960Feb 19, 1963Pall CorpMagnetic pressure indicator
US3080972 *Jul 28, 1958Mar 12, 1963Permanent Filter CorpFiltering component
US3154049 *Feb 19, 1962Oct 27, 1964Screen Products IncMagnetic pressure indicator
US3164164 *Feb 2, 1960Jan 5, 1965Pall CorpPressure-responsive valves
US3204766 *Jul 17, 1961Sep 7, 1965Industrial Filter Pump Mfg CoFilter cake thickness detector
US3220375 *Mar 28, 1963Nov 30, 1965Eaton Mfg CoLubrication indicator
US3250242 *Mar 30, 1964May 10, 1966William L FisherClogged filter indicator device
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US5237957 *Jul 8, 1992Aug 24, 1993Liucci Charles APressure indicator
US5461368 *Jan 11, 1994Oct 24, 1995Comtech IncorporatedAir filter monitoring device in a system using multispeed blower
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US5785844 *Apr 25, 1996Jul 28, 1998Recovery Engineering, Inc.End of life mechanism for water treatment cartridge
US5873995 *May 6, 1997Feb 23, 1999The Clorox CompanyEnd-of-life indicator for water treatment device
US5882507 *Apr 30, 1996Mar 16, 1999Recovery Engineering, Inc.Water filter cartridge end-of-life mechanism
US6423224Mar 15, 1999Jul 23, 2002The Procter & Gamble CompanyFilter cartridge assembly for water treatment device
US6540909 *Mar 7, 2001Apr 1, 2003Davco Technology, LlcFluid filter with pressure relief valve
US6827846 *Jul 25, 2001Dec 7, 2004Parker-Hannifin CorporationFilter element change indicator handle
US6841065 *Nov 22, 2002Jan 11, 2005Davco Manufacturing, L.L.C.Fluid filter with pressure relief valve
US6881327Nov 18, 2003Apr 19, 2005Pur Water Purification ProductsWater treatment device with fill-counting cartridge
US7854837Nov 10, 2008Dec 21, 2010Davco Technology, LlcFilter cartridge with pressure relief valve
US8574430Sep 17, 2010Nov 5, 2013Davco Technology, LlcFilter assembly with modular relief valve interface
DE1233621B *Apr 13, 1960Feb 2, 1967Lloyd And Hillman LtdVorrichtung zum UEberwachen eines Druckes oder einer Druckdifferenz
DE1276932B *Jul 13, 1964Sep 5, 1968Lloyd And Hillman LtdVorrichtung zur UEberwachung eines Drucks oder einer Druckdifferenz
EP1068888A1 *May 23, 2000Jan 17, 2001Hozelock LimitedFilter assembly with bypass valve and indicator means
Classifications
U.S. Classification340/607, 210/87, 116/DIG.420, 200/308, 210/130, 340/611, 116/267
International ClassificationF16N29/04, B01D35/143, G08B5/02, F16N39/06
Cooperative ClassificationY10S116/42, F16N29/04, B01D35/143, F16N39/06, G08B5/02
European ClassificationB01D35/143, F16N39/06, G08B5/02, F16N29/04