U.S. patent number 3,780,397 [Application Number 05/320,803] was granted by the patent office on 1973-12-25 for wet/dry suction cleaner.
This patent grant is currently assigned to The Singer Company. Invention is credited to Martin E. Harbeck, Robert C. Lagerstrom.
United States Patent |
3,780,397 |
Harbeck , et al. |
December 25, 1973 |
WET/DRY SUCTION CLEANER
Abstract
A wet/dry suction cleaner having a dirt storage receptacle and a
power suction module mounted thereon. The module includes a lower
housing, a separator housing and a top cover. A by-pass
motor-blower unit is mounted between the two housings and an air
shut-off valve assembly depends downwardly from the lower housing
into the receptacle. The separator housing includes downwardly
depending annular walls which separate the blower working airflow
from the motor cooling airflow and has an exhaust port which
communicates with the blower airstream. Motor cooling air enters
inlet slots in the separator housing and is baffled by a labyrinth
of vertical walls formed by the top cover and separator housing.
The air then flows between the top and the separator floor and
enters the motor through an opening in the separator. The cooling
air exits the motor to a cooling air exhaust chamber formed by the
annular walls of the separator housing, exhausts therefrom between
the cover and separator housings, and is baffled before exiting by
a labyrinth similar to that at its entry.
Inventors: |
Harbeck; Martin E. (Anderson,
SC), Lagerstrom; Robert C. (Anderson, SC) |
Assignee: |
The Singer Company (New York,
NY)
|
Family
ID: |
23247929 |
Appl.
No.: |
05/320,803 |
Filed: |
January 3, 1973 |
Current U.S.
Class: |
15/413; 310/58;
310/88 |
Current CPC
Class: |
A47L
5/12 (20130101); A47L 7/0028 (20130101); A47L
7/0042 (20130101) |
Current International
Class: |
A47L
5/12 (20060101); A47L 7/00 (20060101); A47l
005/00 (); A47l 007/00 () |
Field of
Search: |
;310/66,67,52,58,59,62,88 ;15/352,353,257A,257B,412,413 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Salce; Patrick R.
Claims
Having thus set forth the nature of the invention, what is claimed
herein is:
1. A power suction module adapted for use with an open top storage
receptacle having an air inlet for drawing wet and dry dirt laden
air therethrough, said module comprising a substantially cup shaped
lower housing having an air inlet supporting a by-pass motor-blower
unit with the blower intake in flow communication with said inlet,
the motor of said unit positioned above the blower and being cooled
by an airstream separate from the blower working airstream, a
separator housing having inner and outer downwardly extending
annular walls positioned on the motor-blower unit, the outer wall
forming with the lower housing a blower working airstream exhaust
chamber for receiving working air exhausted from the blower, means
defining an exhaust port in said separator housing communicating
with said blower exhaust chamber, the inner and outer walls forming
therebetween a motor cooling air exhaust chamber for receiving
cooling air which has passed through the motor, means defining a
cooling air inlet aperture in said inner wall, means defining a
cooling air exhaust aperture communicating with said cooling air
exhaust chamber, said separator housing including inlet baffles and
exhaust baffles, each of said baffles comprising at least an inner
and outer upstanding wall and a peripheral rim spaced above the
lower housing, means defining cooling air inlet and cooling air
exhaust slots intermediate a respective outer upstanding annular
wall and peripheral rim, a cover positioned on said separator
housing including a peripheral rim engaging said separator housing
outwardly of each of said inlet and exhaust slots and being spaced
from said separator housing to define a cooling air inlet path from
said cooling air inlet slots to said motor cooling air inlet
aperture, and a cooling air exhaust path from said cooling air
exhaust aperture to said exhaust slots, and a downwardly extending
annular wall formed on said cover intermediate the upstanding
annular walls of each said baffle, each last named wall terminating
below the elevation of the tops of respective upstanding annular
walls.
2. A power suction module as recited in claim 1 wherein said
cooling air inlet and exhaust slots are disposed in a substantially
horizontal plane.
3. A power suction module as recited in claim 1 wherein the
upstanding walls of said inlet baffles, said inlet slots and said
cooling air inlet aperture are substantially within the sector of a
circle on one side of said separator housing, and the upstanding
walls of said exhaust baffles, said exhaust slots and said cooling
air exhaust aperture are substantially within the sector of a
circle on the opposite side of said separator housing.
Description
BACKGROUND OF THE INVENTION
This invention relates to utility suction cleaners for picking up
liquid and other materials and more particularly to an improved
casing construction of a power suction module for such cleaners
which prevents liquid from entering the electrical system thereof.
It is particularly well suited for a vertical axis utility type
cleaner for use in and out of the home.
In order to prevent moisture from entering the motor section,
cleaners of the type capable of vacuuming up both liquid and solid
materials generally use by-pass motor-blowers in which the
airstream for cooling the motor is maintained separately from the
working air moving the dirt and/or liquid. Moreover, utility type
suction cleaners which are used outside the home, e.g., on patios,
driveways, walks etc. are known to be left outside inadvertently. A
problem can therefore result if the weather changes over night and
a rainstorm developes. This particularly can be a problem when the
cleaner is of the wet/dry type using a by-pass motor-blower system,
since the cooling air inlet and exhaust lead directly to and from
the motor without first passing through the storage receptacle as
would a purely dry suction cleaner having a motor-blower in which
the cooling airstream is the working airstream that has passed
through the blower. If the electrical system is not securely
protected against the entry of moisture, an electrical path to
ground and a breakdown in motor insulation could result. This
situation could result in a hazardous shock to one later attempting
to operate the cleaner. The trend toward double insulating to
prevent hazardous shock has spurred at least one safety certifying
organization to devise a series of stringent requirements for
cleaners of this type. One test which the cleaner is required to
pass is a high intensity rainstorm after which dielectric and
current leakage test are conducted. In order for a cleaner to pass
these tests it must be designed so that no water leaks into the
electrical areas during both operation and nonuse conditions. One
approach to such a design is disclosed in co-pending Patent
Application No. 320,802 filed on even date herewith. The present
invention is another, but simpler, construction for solving these
problems.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to
provide in a power suction module for a utility cleaner having a
by-pass motor-blower, a casing construction which prevents the
entry of liquids into the electrical system.
Another object of this invention is to provide in a power suction
module for a utility vacuum cleaner having a by-pass motor-blower,
a casing construction which prevents liquid from entering the
electrical system through the motor cooling inlet and exhaust
ports.
A further object of this invention is to provide in a utility power
suction module for a vacuum cleaner having a by-pass motor-blower,
a construction in which the working airflow and the motor cooling
airflow are maintained separate.
A still further object of this invention is to provide a power
suction module for a utility vacuum cleaner capable of wet and dry
operation having a casing including a plurality of baffles which
prevent any liquids from entering the cooling air inlet and
exhaust.
The present invention achieves these objects by providing a power
suction module for a utility cleaner in which the working airflow
which enters into a dirt receiving receptacle and passes through
the blower is maintained separate from the cooling airflow which
separately enters the cleaner through slots formed in a separator
housing and is deflected by a labyrinth of walls formed by the
separator housing and a top cover. After the air cools the motor,
it exhaust at the opposite side of the cleaner module through a
labyrinth of walls and slots in the separator housing similar to
that at which it entered.
BRIEF DESCRIPTION OF THE DRAWINGS
The particular features and advantages of the invention as well as
other objects will become apparent from the following description
taken in connection with the accompanying drawings, in which:
FIG. 1 is a vertical cross-sectional view of a vacuum cleaner
embodying the novel features of the present invention, the dirt
receptacle being broken away for convenience,
FIG. 2 is a vertical cross-sectional view taken through the vacuum
cleaner of FIG. 1 but in a plane normal thereto;
FIG. 3 is a top plane view of the vacuum cleaner of FIG. 1, with
the top cover removed; and
FIG. 4 is a bottom plan view of the top cover.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the accompanying drawings wherein like reference
numerals denote similar parts throughout the various views, there
is disclosed a utility vacuum cleaner similar to that disclosed in
the aforesaid co-pending U.S. Pat. Application No. 320,802, but
incorporating the new and improved power suction module
construction of the present invention. The cleaner generally
designated 20 comprises an open top substantially cylindrical dirt
receptacle 22 and a power suction module comprising a lower housing
24, a separator housing 26 and a top or cover 28, which hereinafter
will be described in detail. Each of these assemblies preferably is
comprised of synthetic plastic and is manufactured by molding.
Formed adjacent to the open end of the dirt receptacle 22 is an air
suction inlet conduit 30 opening into the receptacle and adapted to
couple a conventional vacuum cleaner flexible hose (not shown) in
the usual manner. Preferably, a styrene baffle 32 may be mounted
behind the inlet aperture defined by the conduit 30. The baffle
should be shaped to direct the inlet air and liquid downwardly and
circumferentially toward the lower inside walls of the
receptacle.
The lower housing 24 is substantially cup shaped having a
peripheral flange 33 including a peripheral rim 34 substantially
corresponding in shape to the periphery of the top of the dirt
receptacle, and includes at its underside an annular groove 36 for
receiving the top peripheral portion of the dirt receptacle. In
this manner the lower housing is supported on the dirt receptacle
with the cup shaped portion of the housing nested therein, and the
housing is detachably secured to the receptacle in the same manner
as described in co-pending U.S. Pat. Application No. 133,655, filed
Apr. 13, 1971, now U.S. Pat. No. 3,732,667. At the bottom of the
housing 24 there is formed a substantially flat circular seating
portion 38 having an aperture 40 formed centrally therein with a
downwardly extending neck 42 communicating with the interior of the
dirt receptacle. A number of threaded bosses 44 (only two of which
are shown) are molded on the bottom of the housing radially
outwardly from the aperture 40 for supporting a valve housing
assembly generally designated as 46.
The valve housing assembly 46 comprises a substantially cylindrical
valve housing 48 extending downwardly from a flanged disc portion
50. A short upstanding cylindrical wall 52 extends upwardly from
the disc surface 50 of the housing assembly. Mounting screws 54
pass into the bottom of the disc 50 and are threadedly received
into the bosses 44 to secure the assembly 46 to the housing 24. An
inverted cup shaped plastic float valve 56 having a short metal rod
58 centrally secured to the upper surface thereof, is positioned
within the housing 48. The rod extends through a substantially
central opening 60 in the surface of the disc 50 and is secured at
its upper end to a valve member 62 adapted to close off the airflow
to the aperture 40. The float 56 is made of a light weight
polyethlene material and is capable of floating not only on liquids
but also on foam. When the level of liquid and/or foam in the
receptacle 22 reaches a predetermined level, the float 56 moves
upwardly until the valve 62 seats against the bottom of the neck 42
to shut off the airflow to the aperture 40. A grid type guard 64 is
fitted around the bottom of the housing 48 to protect the float 56
against the entry of large dirt particles and to protect the float
against contact with a paper filter (not shown) used during dry
operation of the cleaner.
Mounted on an annular seal 66 positioned in the seat 38 is the
blower 68 of a by-pass type motor-blower unit generally indicated
as 70. A by-pass motor-blower is one in which a separate airstream
from the working airstream is utilized to cool the motor. The
blower has a centrally disposed inlet 72 positioned in
communication with the aperture 40, and includes a plurality of
exhaust openings 74 tangentially disposed about the cylindrical
housing thereof. Mounted vertically above the blower 68 is the
motor portion 76 of the motor-blower unit. A motor-blower shaft 78
is journaled at its upper end in a yoke member 80 and at its lower
end in the blower wheel (not shown) of the blower unit. The motor
armature (not shown) is secured to the shaft 78 and provides the
power to drive the blower. Two cooling air exhaust apertures 82 may
be formed in the lower portions of the motor casing. The upper
portion of the motor just beneath the yoke 80 is opened for
receiving the cooling air and preferably has a small cooling fan
secured to the shaft 78 just below the yoke for providing positive
cooling to the motor core and armature.
The separator housing 26 comprises a floor or plate surface 84
including an upstanding substantially narrow rectangular bridging
or spanning portion 86 substantially centrally located above the
plate surface and extending lengthwise a distance substantially
equal to the diameter of the blower. The top surface of the
bridging portion 86 may include preferably two holes 88 for
receiving a respective screw 90 which is threadedly received in the
yoke of the motor-blower unit to secure the housing thereto.
Extending downwardly from the floor or plate 84 of the housing 26
is an inner substantially cylindrical annular wall 92 and an outer
substantially cylindrical longer annular wall 94. The outer wall 94
engages a seal 96 which abuts the upper surface of the blower
housing, while the inner wall 92 engages the upper portion of the
motor housing just below the yoke. The cup shaped housing 24 and
the downwardly extending annular wall 94 define therebetween a
blower exhaust chamber communicating with the blower ports 74,
while the walls 92 and 94 of the housing 26 define therebetween a
motor cooling air exhaust chamber for receiving cooling air
exhausted through the openings 82. Formed in the separator floor or
plate 84 on the left side of the motor as illustrated in FIG. 2, is
a small substantially arcuate sector shaped opening 98 which merges
with an opening 100 formed in the upstanding wall 102 of the
spanning portion 86. The aperture defined by openings 98 and 100 is
the cooling air inlet and communicates with the upper end of the
motor. Communicating with the motor cooling air exhaust chamber is
a larger substantially arcuate sector shaped opening 104 formed in
the separator housing floor or plate 84 on the left side of the
motor as illustrated in FIG. 2. As best illustrated in FIGS. 1 and
3, the floor 84 of the separator housing 26 adjacent the right side
of the spanning member 86, is flared upwardly at an acute angle
into an annular wall 106 defining an aperture 108. The aperture
forms an exhaust port in the separator and communicates with the
blower exhaust chamber formed between the wall 94 and the interior
of the lower housing 24. Mounted on the floor 84 on the left side
of the bridging member 86 and to the bridging member as illustrated
in FIGS. 1 and 3 is a conventional toggle actuated switch 110 to
which the electrical wiring 112 from the motor leads. The wiring
may be wrapped about a pair of posts 114 and extends out the module
through a hole 116 in the separator floor 84.
On the upper surface of the floor 84 and spaced radially slightly
outwardly from the wall 94 is an upstanding annular wall 120 (FIG.
2). This wall, as best illustrated in FIG. 3, is divided into two
arc shaped upstanding walls 121 and 122 by four walls 124, 125, 126
and 127 extending radially from the bridging member toward the
periphery of the separator housing. A second upstanding annular
wall 130 (FIG. 2) spaced radially outwardly from the wall 120 on
the upper surface of the plate 84 is also divided into two arc
shaped upstanding walls 131 and 132 by the radial walls 124, 125,
126 and 127. The peripheral rim portion of the separator housing 26
includes a peripheral bead 134. The peripheral portion between the
bead 134 and the wall 130 is spaced above the upper surface of the
flange 33 of housing 24. A short annular rib 136 radially spaced
inwardly from the bead 134 extends upwardly from the top surface of
the housing 26 except in the vicinity of the exhaust port annular
wall 106. Between the wall 131 and the rib 136 in the sector
determined by the walls 125 and 127 is a plurality of horizontally
disposed slots 138 which form cooling air exhaust apertures, while
similar slots 140 between wall 132 and the rib 136 in the sector
determined by the walls 124 and 126 form the cooling air inlet
apertures. Since the housing 26 in the preferred embodiment is
circular, it should be clear that the walls 124 and 126 thus form a
sector of a circle within which is located the cooling air intake
path, while the walls 125 and 127 form a sector within which is
located the cooling air exhaust path. Except for a small jog 128 in
wall 127, in the preferred embodiment each sector is substantially
120.degree..
The cover 28 is substantially an inverted pan shaped member
preferably having a circular periphery which engages the separator
housing between the bead 134 and the rib 136. Centrally spanning
the upper surface is a handle 142 through which a pair of screws
144 extend and are threadedly received in bosses 146 on the member
86 to secure the top to the separator. The underside of the top
includes an annular rectangular recess 148 which receives the
rectangular bridging portion 86 of the separator housing while four
pair of spaced radial ribs 150, 151, 152 and 153 respectively
receive the walls 124, 125, 126 and 127. Depending downwardly from
the top, radially between the walls 121 and 131, is an arc shaped
wall 154 extending angularly between the ribs 151 and 153 while a
similar wall 156 depends downwardly between the walls 122 and 132
and angularly extends between ribs 150 and 152. Each of the walls
154 and 156 extends vertically below the respective walls 121, 131
and 122, 132, but does not contact the floor 86. Similarly, the
walls 121, 131, 122 and 132 do not contact the top. The upper
surface of the top in the vicinity of the exhaust port wall 106, is
tapered outwardly as at 158 to receive the upper surface of the
wall 106 in complementary fashion.
In operation, motor cooling air enters between the peripheral bead
134 and the top of the flange 33 of the lower housing 24 in the
inlet sector and passes in through the inlet slots 140 in the
separator. The cooling air must then pass over the annular wall
132, under the wall 156 and up on the wall 122 before it can enter
the cooling air inlet openings 98 and 100 leading to the motor.
Motor cooling air is exhausted from the openings 82, pass into the
exhaust chamber between walls 92 and 94 and upwardly through the
opening 104. It must then pass over wall 121, under wall 154 and
over wall 131 before exiting from the slots 138 on the side of the
cleaner opposite to where it entered. The path of motor cooling
airflow is clearly illustrated in FIG. 2. It is obvious, therefore,
that the walls 122, 132 & 156 and walls 121, 131 & 154
comprise a respective labyrinth of inlet and exhaust baffles for
diverting the respective intake and exhaust cooling airstreams, and
for preventing water, even during a driving rainstorm from entering
the motor and electrical areas.
The working airstream as illustrated in FIG. 1 enters the inlet 30
and may pass through a filter 160 prior to entering the aperture 40
and the blower inlet 72. The filter 160 is described in detail in
co-pending Patent Application No. 320,801 filed on even date
herewith but for present purposes can be described as being of a
substantially cup-like shape comprising a fabric material, and as
having an opening 162 in the lower peripheral portion thereof
through which the valve housing 48 protrudes. The upper peripheral
portion of the filter 160 includes a resilient gasket 164 to seal
the dirt receptacle from the housing 24. Any liquid entering with
the dirt through the inlet port 30 drops to the bottom of the
receptacle and as the liquid and/or foam level in the receptacle
raises to the point where the float 56 is lifted to close the
opening 40 by means of the valve 62, the airflow entering the
cleaner through the openings 30 is effectively closed off to
protect the blower and motor unit from damage by the liquid and/or
foam.
Numerous alterations of the structure herein disclosed will suggest
themselves to those skilled in the art. However, it is to be
understood that the present disclosure relates to a preferred
embodiment of the invention which is for purposes of illustration
only and not to be construed as a limitation of the invention. All
such modifications which do not depart from the spirit of the
invention are intended to be included within the scope of the
appended claims.
* * * * *