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Патент USA US2122179

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June 28, 1938.
Filed July 51, 1957
Patented June 28, 1938
Ward Leathers, Haworth, N. J., assignor to
Quadrex Corporation, New York, N. Y., a cor
poration of Delaware
Application July 31, 1937, Serial No. 156,696
2 Claims. (Cl. 183—-59)
The principal object of my invention is ‘to pro
vide means whereby stoppage of dirt may be
avoided or removed at the U-turn in the top of a
vacuum cleaner ?lter. My device applies more
5. particularly to that type of cleaner which has a
?lter co-axial with an operator's handle, and
wherein the dirt-laden air is carried upward to
the top of the ?lter, directed through a U-turn'at
that point and then directed downward through
the?lter toward the dirt-receptacle.
My invention consists primarily of a spring-re
sisted plunger. It is disposed in the top of the
?lter and passes through, and is manually oper
able through, a transparent domelike ?lter top. Its
purpose is to indicate to the operator when any
stoppage of dirt or rubbish occurs in the top of
the ?lter (at the U-turn) , and to enable the op
erator, without opening the ?lter-top, to dis
engage it instantly and manually.
In order to set forth my invention so all those
familiar with these arts may understand, I have
prepared the following speci?cation and appended
drawing, of which:—
Figure I is a diagrammatic side view of my
push-broom type vacuum cleaner.
Figure II is a partially cross-sectioned eleva
tion of the ?lter-top and plunger mechanism.
Figure III is the same showing a modi?cation.
A motor-blower-unit (Figure I) has joined to
30 its bottom end a removable nozzle 2, to its top is
joined an up-draught air tube 3 held between
the motor-blower-unit and supporting member 4.
A ?lter 5 surrounding an operator’s handle 6 is
also joined to the supporting member 4. An in
ner ?lter duct 1 directs the dirt-laden air to the
top of the ?lter where, after making a U-turn,
it passes downward through the ?lter toward a
dirt-receptacle 6. The ?lter communicates at its
lower end through the supporting member 4 with
the dirt-receptacle 8 which is held to the under
side of the supporting member by means of a
latch 9. At the upper end of the operator’s han
dle is a handle-grip In, a current supply cord II,
and a hang-up ring 12.
A dome of transparent material 13 (Figure II)
is joined to the top of the ?lter 5 in any suit
able manner, but preferably by a manually re
leasable latch [4. The ?lter, as shown made of
fabric, is held as by riveting between an annular
outer ring [5 and an annular inner ring 16. Be
tween these two rings is disposed a compressible
gasket or packing ring I‘! made of rubber, sponge
rubber, felt, or other compressible material. An
up-draught inner dirt duct 1 is made by sewing a
55 piece of fabric on both edges (as at 18) to the
inner wall of the ?lter. The upper end of this
fabric piece is provided with a welt 20 for the pur
pose of holding the central portion high enough
to carry the up-draught dirt-laden air into the
dome l3 where it is obliged to make a U-turn on
the inner face of the dome i3. A pin 21 passing
through the handle 6 supports a washer 22, which
supports the lower end of a spring 23 surround
ing the handle. The spring impinges between the
washer 22 and the turned-in top- of a solid cylin 10
drical sleeve 25, which surrounds both spring and
handle. An annular moulded rubber piece 25 on
the top of the cylindrical sleeve serves as a con
venient manual handle-grip.
Joined to the bot
tom of the sleeve 25, as by a screw thread, is an
annular part 21 having a projecting shoulder
which is held, by means of the spring 23, against
the under side of a Washer 30. This washer may
be of rubber or felt or other yieldable material.
It ?ts snugly within a recess in the transparent 20
dome I3. A further soft washer 3| of‘ felt or
other yieldable material ?ts next the handle and
is held within the annular part 21. The pur
pose of the washer or gaskets I1, 30, and 31, is
to avoid the leakage of dirt-laden air and hence 25
the dissemination of dust. The cylindrical sleeve
25 together with its spring 23, and its bottom
member 21, comprises a plunger which is free to
move longitudinally with the handle. The up
ward thrust of the spring in this plunger mech 30
anism pulls upward on the dome l3 and hence on
the fabric ?lter 5 holding the latter ?rmly taut
and cylindrical. When the machine is in opera
tion and there is air pressure inside the ?lter,
the ?lter 5 and the dome l3 holds ?rmly in, place
Without the upward effort of the spring 23. Un
der these conditions the plunger mechanism, by
means of the handle-grip 26, may be pushed
downward freely, the cylindrical part 25 sliding
through the washer or gasket. 30. When the 40
plunger is so depressed it contacts and distorts
the welt 20 in the top of the inner dirt duct 1 and
as it passes upward and downward through the
dome l3 and so disturbs the welt it disengages
any cleavage or accumulation of dirt or rug nap 45
which may occur, and the stream of air blows it
immediately into the larger portion of the ?lter
where the dirt-laden air passes downward toward
the dirt-receptacle 8.
In use it is highly desirable that some‘ means 50
of avoiding dirt cleavage at the U-turn be pro
vided. The transparent top 93 lying as it does
directly in the operator’s line of vision gives im
mediate evidence of any such stoppage and the
plunger ‘mechanism without the leakage of dirt 55
or dust can be used for instantly dislodging such
troublesome material.
The foregoing description pertains to a ?lter,
?lterqtop, and operator’s handle wherein the
operator’s handle passes through the ?lter-top
cap l3. The plunger rod passes through the cap
I3 and has joined to it at its inner end a suitable
disc or face which may be annular or otherwise
and continues downward through the ?lter to a
shaped, may be recessed into the cap 13 in order
to keep a perfectly smooth interior for air ?ow
purposes, and may also be provided, if desired,
point of attachment at the bottom of the ?lter for
with small milled teeth or projections on its
furnishing the main longitudinal structural sup
port of the machine. I have found it very de
outer rim so that turning the button 43 will help
to dislodge any rubbish that may accumulate
_> about the top of the inner ?lter duct 1. Such 10
10 sirable in some cases to omit that portion of the
handle which passes through the ?lter, see Fig‘ - modi?cation of the mechanism of Figure 11 is
ure III.
In this case, the ?lter-top I3- is joined
in any suitable manner as by screws or manually
releasable latches (as at I4 in Figure II) to an
necessary where the operator’s handle 6 does not
pass through the ?lter, or in other words, is not
used for structural support of the machine in the
outer solid ?lter casing 40. This cylindrical case is
made of any thin, light, stiff, non-dentable ma‘
?lter zone.
terial such as hard ?bre.
1. In a vacuum-cleaner, a motor-suction-unit,
an operator’s handle surrounded by a ?lter, a
The outer case 40 is
joined at its bottom in a rigid manner to‘ the '
I claim:
supporting member 4, which in turn is joined. in v dome-likecap on said ?lter, a spring-resisted
20 a substantial and rigid manner to the up-draught' 'plunger surrounding the handle and passing 20
air tube 3, which is also joined in a rigid struc
tural manner to the motor-suction-unit I. When
the operator’s handle 6 is joined to the ?lter cap
13 in rigid manner, as, for instance, by rivets or
screws, the vacuum cleaner becomes a rigid struc
ture from the handle-grip ID to the motor-suc
tion-unit I without the operator’s handle 6 pass
ing through the ?lter. The ?lter 5 is joined at
its top to the outer casing 40 by means of an in
30 ternal ring 4| which also provides a seat or an
chorage for the ?lter cap I 3. It is self-evident
that in this structure the agitator plunger can
not surround the handle 6 and is, therefore, pro;
vided on the side thereof. It may be devisedin
35 many forms but I have shown it somewhat di
agrammatically as a plunger rod 42 with a top
push-button 43 and an upward-lifting spring 44
impinging between the push-button. 43 and the
through said cap for disengaging dirt or rubbish
that sticks in the top of the ?lter.
2. In a vacuum-cleaner, a motor-suction-unit,
an operator’s handle surrounded by a ?lter, a solid
domelike top on said ?lter, and a plunger sur 25
rounding said handle and passing through the
said top for disengaging dirt or rubbish that
sticks in the top of said ?lter.
3. In a vacuum-cleaner, a motor-suction unit,
a ?lter having an internal duct for leading dirt 30
laden air to a point near the top of said ?lter,
a dome-like cap on said ?lter, and a manually
operable plunger surrounding an operator’s han
die with both handle and plunger passing through
the top on said ?lter for dislodging dirt or rubbish 35
that sticks in the top of said ?lter.
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