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Publication numberUS1770094 A
Publication typeGrant
Publication dateJul 8, 1930
Filing dateJul 1, 1929
Priority dateJul 1, 1929
Publication numberUS 1770094 A, US 1770094A, US-A-1770094, US1770094 A, US1770094A
InventorsElmer E Wickersham
Original AssigneeCaterpillar Tractor Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1770094 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

July 8, 1930 E. E. wlcKERsl-IAM 1370,094

' SIGNAL K Filed July 1, 1929 2'. Sheets-Sheet 1 Flll- July 8, 1930 E. E. wlcKERsHAM 1,770,094


My invention relates to signals for use wlth cleaners, particularly air cleaners such vas are utilized in connection with hydrocarbon motors.

Air cleaners are usually installed ipon machinery wherein air is utilized as a uid during the operation of the engine.` The purpose of the cleaners, as is well known, is to remove particles of grit, dirt andother undesirable foreign matter from the air prior to its admission to the engine. The pressure drop through the cleaner, which ordinarily is negligible, rises under some conditions to such a value as to affect the efficiency and operation of the engine.

It is an object of my invention to provide a device for indicating the relative condition of an air cleaner.

Another object of my invention is to pro-1 vide a device, which, upon the removal by the air cleaner of a'predetermined quantity of foreign matter, enables a suitable signal to advise an operator.

A further object of my invention is to provide an air cleaner so that av more efiicient delivery of air is eected to the engine to which it is attached.

The invention possesses. other advantageous features, some of which with the foregoing will ybe set forth at length in the following description which I shall outline in full that form of the signal of my invention, which I have selected for illustration in the drawings accompanying and forming part of the present specification. In said drawings I have shown one form of signal embodying my invention, but it is to be understood that I do not limit-myself to such form since the.

invention, as set forth in the claims, may be embodied in a plurality of forms.v

In the drawings to which I have made reference, l

Fig. 1 is a side elevation of a hydrocarbon motor to which a device of my invention is attached.

Fig. 2 is a section through a form of a device of my invention positioned upon the outlet of an air cleaner.

Fig. 3 shows a form of indicating means employed,

Fig. 6 is another modificationV of the de-V vice of my invention.

Fig. 7 is a further modification.

The device and method of my invention may be briefly characterized as comprising the provision of means for -indicating that the pressure drop through the air cleaner has reached a predetermined amount.

'While my device may be utilized in connection with air cleaners positioned upon other forms of engines it is employed with great success upon an ordinary gasoline engine. Thus, as is particularly shown in Fig. 1, an air cleaner 11 is usually provided in communication with the air horn 12 of a carburetor 13. The carburetor is utilized in the usual manner to supply fuel through the intake manifold 14 to the several cylinders of the hydrocarbon motor indicated generally The air cleaner 11 is usuallyof any of the commercial types available upon the market.

vUnder operating conditions, as when the hy@ drocarbon motor 16 is utilized with harvesting or tractor machinery, the air cleaner often rapidly fills with foreign matter, and itis both expedient and desirable that the filter be cleaned several times during av normal days run. However, because ofthe exigencies of operation it happens, not infrequently, that the air cleaner 1s neglected and, accordingly, as the pressure drop through the cleaner rises,

thev efiiciencyof theengine drops off.

To warn against the presence of an excessive pressure drop through the air cleaner I material as metal and is-provided with an tioned with respect to pointer36 mounted upon the bellows. The strip is conveniently laperture 22 in such a manner that only a small portion of the air taken into the intake manifold is passed thru it. The whistle is ordinarily inoperative until an excessive pressure drop throughv the air cleaner occasions the passage of a large volume of air thru the aperture. The whistle then sounds a characteristie note. To position the whistle it is conveniently mounted upon a hollow stud 26 which is screwed into boss 27 on cap 28 of the i air cleaner.

form shown in Fig. 3 a strip 33 is usually fastened upon the lair cleaner by 'a screw 34 in such a manner that it is operatively posiprovided with a series of graduations so laid out that when the bellows is in normal uncollapsed position the pointer is opposite'to a letter A on the strip, which indicates that the air cleaner is in satisfactory. condition. As the pointer 36 moves down it approaches a lower limit, indicated by the letter B, at which vpoint it is desirable that the air cleaner be removed and reconditioned.

Under operating condition it sometimes happens that the operator will ignore the indication. The collapsible bellows 31 is expediently utilized further to actuate a suitable signal. Thus'as is shown in Fig. 4 the bellows is provided with an extending arm 41 upon' `which isfiounted, in electrical contact with the arm, contact 42|. A support 43 is provided between the bellows and the stud 32 upon which the bellows is mounted. Another lcontact 44 is provided upon the arm 43 from which it is insulated. These contacts'are placed `in an electricalcircuit, in any well known manner, and utilized to sound a suitable horn or bell to warn the operator that t-he air cleaner should be reconditioned.

. I havefound it desirable also, in some instances, to place the contacts mentioned above in the ignition circuit of the motor in such a manner that the circuit was rendered ineffective when the air cleaner needed reconditioning. This assures the necessary attent-ion to the cleaner.

Because of the hazardous conditions under which gasoline engines are sometimes operated it is expedient that all possible dangersbe obviated from'back firing thru the carburetor of the engine. While the aircleaner $5 imposes a closure to the air intake side of the A collapsible, resilient,-

carburetor it -is possible that a flame might with the air delivery side of thepcleaner. A

portion 53 of the body 51 is in direct conimunication with the air cleaner thru passage 54 in stud 52. The portion of the body 51 is usually provided with an aperture 5.6 formed by lips57 and 58. Lip 57 is expediently of such a nature that upon a passage of .air into Athe manifold a musical note will be sounded. To screen the aperture 56 a portion 59 of the body 51 substantially surrounds the aperture and provides a large volume into which Huid emitted from the' aperture passes. The portion 59 is partially sealed with a plug 61 so that aperture 62 is provided for the passage of fluid into the body 51 in such a manner that the iuid stream impinges upon the lip 57.- The aperture 62 is adjacent to the base of the body 51 and is of such an extent that considerable fluid resistance is imposed upon the air stream entering the aperture.

In the modification shown in Fig. 6 a whistle 71 having an outer shell 72 is mounted upon hollow stud 7 3 which is provided in communication with the air cleaner. In this instance, however, the fluid passage thru the stud is extended by means of a tube portion 74. An air entrance 76 is provided in the lower portion of the outer shell adjacent to a lip 77.

. In the modification shown in Fig. 7 asuitable suction whistle 81 is positioned upon a l hollow body 82 by a stud 83 to which the whistle is aiiixed. The body 82 is provided with a fluid passage which I have indicated as 86. Interposed in this -luid passage and adjacent to a restricted portion 87 thereof I preferably position a ball check 88 in such a mannerv that the passage of fluid out of the intake manifold to the atmosphere is resisted by the ball check. However, the weight of the check is so slight that upon the certainl desired minimum thru the air cleaner the check is lifted from its position and is rendered inoperative with respect to occasioning of a pressure drop beyond a the passage of air into the manifold. To K facilitate the construction and placing of the check I preferably provide a stud 91. This stud isl conveniently formed with an extension 92 adapted to be positioned in the passage 87 to retain the check in position so that it cannot work its way out.

I claim:

1. In combination with an enginehaving an intake manifold, an air cleaner in communication with said manifold thru whlch air lows to said engine, and means for indicating the pressure drop ofsaid air flowing' thru cleaner.

2. In combination with an engine having an intake manifold, an air cleaner in communication with said manifold thru which air flows to said engine normally with negligible pressure drop across said cleaner, and means for indicating an abnormal pressure drop thru said cleaner.

3. In combination with an air cleaner, said cleaner being in communication with a source of air and having a passage away from said cleaner, a pressure responsive means in communication with said passage for indicating a differential between said source and said passage. f

4. A signal device including an aircleaner in communication with a source of air and having a passage away from said cleaner comprising a signaling device, andV means responsive to a pressure differential between said source and said passage for enabling said signaling device. L

5. In combination, an air cleaner in communication with a source and a Huid consumer, means responsive to .a diference in pressure between said source and said consumer, and means actuated by said responsive means for initiating a signal.`

6. In combination, a body through which air is adapted to pass, indicating means for giving an indication to an operator, and means responsive to an abnormal pressure drop through said body for energizing said indicating means to indicate to the operator of the abnormal'pressure drop.

7 In combination, an air cleaner, means y for .indicating an abnormal condition to an operator, and means responsive to an abnormal pressure drop through the cleaner for enabling the indicating means. Y

8. In combination, an air cleaner; a hollow body carrying a signaling means adapted to be placed in communication with the cleaner under abnormal conditions therein, and valve meanslresponsive to an abnormal condition in the cleaner for providing communication to the signaling means. i y

9. In combination, an air cleaner, a signaling means enabled upon decrease of pressure. therein to signal an operator, and valve means responsive to pressure decrease through the cleaner for placing the signaling means in communication with the cleaner to be enabled to signal an operator.

In testimony whereof, I have hereunto set my hand.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2466757 *Nov 30, 1945Apr 12, 1949Wildhack William ALeak tester
US2753831 *May 10, 1952Jul 10, 1956Walter B DaviesAir filter clogging warning apparatus
US2911065 *Jan 7, 1953Nov 3, 1959Bituminous Coal ResearchAsh separator for powdered coal burning pressurized combustion system
US3099546 *Aug 26, 1960Jul 30, 1963Nuquip LtdFilters for fluids
US3166062 *Dec 16, 1963Jan 19, 1965Earl E MooreSmog device for automobile engines
US3411477 *Aug 3, 1967Nov 19, 1968Marvel Engineering CompanyPressure differential indicator
US4321070 *Aug 22, 1980Mar 23, 1982Bede Industries, Inc.Whistle to signal clogged air filter
US8021618Sep 19, 2006Sep 20, 2011Cooper Nathan RFilter with change indicator
DE1119595B *Jun 18, 1960Dec 14, 1961Eberspaecher JVorrichtung zur Anzeige des Verschmutzungsgrades von Filtereinsaetzen
U.S. Classification116/67.00R, 96/423, 96/421, 55/DIG.340, 116/DIG.420, 96/419, 116/70
International ClassificationF02M35/09, H01R4/06
Cooperative ClassificationH01R4/06, Y10S116/42, F02M35/09, Y10S55/34
European ClassificationF02M35/09, H01R4/06