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Патент USA US3052210

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Sept. 4, 1962
3,052,207
D. B. LEWIS
AIR FILTER ALARM
Filed July 21, 1958
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INVENTOR.
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BY
ATTORNEY
United stares
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3,052,207
Fat-rented Sept, 4, 19%2
2
1
poles of a battery 29. The switch 26 is a normally open
switch set to close the contacts 31 at ‘a predetermined
3,052,207
pressure in the manifold induction passage 16. The
AER FELTER ALARM
switch 26 is pressure actuated and connected by a conduit
Donald B. Lewis, Lapeer, Mich, assignor to General
Motors Corporation, Detroit, Mich, a corporation of
33 to the passage 16 between the choke 17 and the ven
Delaware
turi 14.
Filed July 21, 1058, Ser. No. 749,919
Switch contacts 34 of switch 27 will be closed when
1 Claim. (or. 116-117)
air ?ow in passage 16 is less than a predetermined value,
and open when air flow is in excess of that value. The
This invention relates to alarm devices indicating when
operations should be performed, and has particular rela 10 switch 27 is actuated by the difference in pressure be
tween the throat of the venturi and a place in the passage
tion to an alarm device that will indicate when a replace
16 beyond the venturi 14. The switch is connected to be
able air ?lter in the air cleaner in the induction system
actuated by the pressure in conduits indicated at 36
of an engine, should be changed.
and 37.
It is proposed to provide an alarm device which will
The switch 26 is set to close the contacts 31 if a re
indicate to the operator of an engine, such as an internal 15
striction of 2 inches of water is caused by dirt clogging
combustion engine employed in a motor vehicle, that
the ?lter 24. The switch 27 is set to open the contacts
the ?lter for the air cleaner should be changed. The
34- in the event the flow of air in the manifold induction
alarm device may be a visual or other well known alarm
passage 16 exceeds 100 cubic feet per minute. These
device that the operator may sense while driving the
and other values may be selected at will to provide over
vehicle and without being able to see or perhaps even
lapping
ranges for the switches 26 and 27 so that the con
hear the engine in operation.
tacts 31 and 34- both may be closed under conditions of
In the drawing:
operation of the engine when the ?lter 24 may cause an
The single FIGURE illustrates in cross-section an in
undesirable resistance to the flow of air to the engine.
duction system for an engine with an air cleaner attached
If it were not for these overlapping ranges it might
and showing schematically an alarm device capable of 25
be possible ‘for one switch to cause actuation of the alarm
operation when the ?lter device becomes suf?ciently
2% to indicate that the ?lter 24 should be changed, when
?lled with dirt to require cleaning.
as a matter of fact nothing had caused the excessive de
An induction system 10 for supplying fuel and air for
pression in the induction system passage other than an
operating an internal combustion or other suitable engine
embraces a throttle valve 11 controlling the ?ow of fuel 30 excessively high speed of operation of the engine.
'I claim:
‘from a suitable and well known ?oat chamber 12
An alarm device for an air induction conduit of an
through a passage 13 leading to the throat of a venturi
internal combustion engine, said conduit comprising ?rst
14 in the induction passage 16 embraced in the induction
and second portions of uniform diameter and an inter
system 10. A choke 17 may be employed in the mani
fold induction passage anterior to the venturi 14 for uti 35 mediate portion having a venturi throat, a pressure-re
sponsive switch operatively connected to the ?rst of said
lization in starting the engine. ‘Beyond the choke is any
portions of uniform diameter, and a di?erentially op
suitable air cleaner 1% comprising a support 19 having
erated switch operatively connected to said second por
an outlet 21 connected to the induction passage 16 and
tion of uniform diameter and to said throat portion, said
a cover 20 removably secured to the support 19 by a
bolt 22 and wing nut 23. A replaceable ?brous or other 40 switches being in series in an electric circuit having a
signal therein.
suitable ?lter 24 is secured between the support 19 and
cover 20 by operation of the wing nut 23.
References Cited in the ?le of this patent
As the air flows into the induction system through the
?lter 24, the ?lter will collect dirt and other foreign mat
UNITED STATES PATENTS
ter which will tend to clog the ?lter and to decrease the 45
2,618,190
Rowe _______________ __ Nov. 18, 1952
?ow of air through the ?lter at any given difference in
cumstances.
2,729,339
2,843,077
2,935,040
Hanert ______________ __ June 22,
Calling ______________ __ Jan. 25,
McCoy _______________ __ Jan. 3,
Leefer _______________ __ July 15,
Steensen _____________ __ May 3,
In order to indicate when the ?lter should be changed,
it is proposed to provide electrical switches 26 and 27
Wired in series with an indicator 28 between the opposite
1,083,459
France _______________ __ June 30, 1954
pressure. If the ?lter becomes sul?ciently clogged with
dirt, this will decrease the ?uid pressure in the passage
16 and reduce the power developed by the engine. It is
therefore desirable to change the ?lter under such cir 50
2,681,585
2,700,362
1954
1955
1956
1958
1960
FOREIGN PATENTS
UNITED STATES ‘PATENT OFFICE
CERTIFICATE OF CORRECTION
September 4, 1962
Patent No. 3,052,207
Donald" B.- Lewis
It is hereby certified that error appears in the above ‘numbered pat
ent requiring correction and that the vsaid Letters Patent should read as
corrected below.
Column 1,
line .27," for "cleaning" read -- changing —-=.
Signed and sealed this‘8th day of January 1963.
(SEAL)
Attest:
ERNEST W. SWIDER
Attesting Officer
DAVID L. LADD
Commissioner of Patents
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