U.S. patent number 3,598,370 [Application Number 04/841,212] was granted by the patent office on 1971-08-10 for humidifier.
This patent grant is currently assigned to McGraw-Edison Company. Invention is credited to Kip J. Hoag.
United States Patent |
3,598,370 |
Hoag |
August 10, 1971 |
HUMIDIFIER
Abstract
A humidifier having an outer case, and a water container and
drum supporting humidifying material on the open periphery thereof
within the case, spaced drive and idler pulleys engaging the inner
edge of one open diametric drum wall and rotatably supporting the
drum with part under the container water material progressively
wetted and moved toward the idler pulley, and a radial flange on
the idler pulley disposed outwardly adjacent the side edge of the
drum suitable to convey excess drum water away before contacting
the drive pulley; air moving means including a venturi opening and
a fan centrally mounted therein for forcing air into the open
diametric wall and through the humidifying material, and a fan
mounting bracket having spaced rods that fit through grommets
supported within openings in opposing case walls asymmetrically
located on opposite sides of the venturi opening until a
crossmember interconnecting the rods engages the adjacent grommets
to center the fan within the venturi opening; a water level control
including a one piece float structure having a hub pivoted to the
case and a float supported radially from the hub by an arm, a
rotatable indicator drum visible outside the case, a link
connecting the drum and hub, and a switch control element supported
adjacent the hub to be engaged by a chordal surface thereon when
the container water level is inadequate; and a humidistat and a
housing for isolating the humidistat from case air ambient the
water container, the housing including a one piece resilient
self-supporting element having opposite edges secured by brackets
to the case and the interconnecting edges abutted and held under
slight compression by sandwiching case walls, one of which is
removable.
Inventors: |
Hoag; Kip J. (Albion, MI) |
Assignee: |
McGraw-Edison Company (Elgin,
IL)
|
Family
ID: |
25284317 |
Appl.
No.: |
04/841,212 |
Filed: |
July 14, 1969 |
Current U.S.
Class: |
261/26; 261/30;
261/92 |
Current CPC
Class: |
F24F
6/06 (20130101) |
Current International
Class: |
F24F
6/02 (20060101); F24F 6/06 (20060101); B01f
003/04 () |
Field of
Search: |
;261/92,30,26 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Miles; Tim R.
Claims
What I claim is:
1. In a device of the type described, the combination of a case, a
water holding container in the case, humidifying material disposed
to be moistened by the container water, wall means including a
venturi opening and a fan for moving air through the humidifying
material for discharge outside the case, said fan including a
unitary mounting bracket having a pair of elongated rods and an
interconnecting cross element near corresponding ends of the rods,
means including opposing case walls asymmetrically disposed on
opposite sides of the venturi opening and spaced apart a distance
less than the rod lengths and resilient grommets confined in
openings in the walls and snugly receiving the rods until said
cross element abuts the grommets adjacent thereto for locating the
fan centrally of the venturi opening, a drum having an open
periphery and an open transverse diametrical wall disposed closely
adjacent the wall means and over the venturi opening, drum support
means including a drive pulley and idler pulley adapted to engage
the inner edge of the open diametrical wall to support the drum so
that the drum periphery extends both within and above the water,
said humidifying material overlying the drum periphery, means to
rotate the drive pulley to in turn rotate the drum in a direction
to progressively wet the humidifying material and to move the drum
over the idler pulley before the drive pulley, a radial flange on
the idler pulley extended outwardly adjacent the side edge of the
drum periphery suitable for conveying excess drum water from the
periphery before reaching the drive pulley, a water level control
having a one-piece float assembly including a hub pivoted about a
generally horizontal axis to the case and a float connected by an
arm to the hub, a control element disposed adjacent the hub and
engaged by a chordal surface thereon when said float indicates a
predetermined inadequate water level in the container for
terminating the operation of the humidifier, an indicator drum
pivoted about a generally horizontal axis to the case and being
exposed through an opening in the case, a link interconnecting the
hub and indicator drum, an on-off control for the device including
a humidistat operable responsive to humidity conditions of air
ambient the unit to control the operation of the humidifier, and a
protective housing about the control, said housing including a
unitary resilient but self-supporting element and bracket means
securing opposite side edges of the element to the case, and
opposing case walls abutting the interconnecting side edges of the
housing and slightly compressing said housing effective for
isolating in a reasonable fluidtight manner the control from the
water container.
2. In a device of the type described, the combination of a case, a
water holding container in the case, wall means including a venturi
opening and a fan, said fan including a unitary mounting bracket
having a pair of elongated rods and an interconnecting cross
element near corresponding ends of the rods, means including
opposing case walls asymmetrically disposed on opposite sides of
the venturi opening and spaced apart a distance less than the rod
lengths and resilient grommets confined in openings in the walls
and snugly receiving the rods until said cross element abuts the
grommets adjacent thereto for locating the fan centrally of the
venturi opening, a drum having an open periphery and an open
transverse diametrical wall disposed closely adjacent the wall
means and over the venturi opening, means to support the drum so
that the drum periphery extends both within and above the water,
humidifying material overlying the drum periphery, means to rotate
the drum to progressively wet the humidifying material and to
operate the fan to move air through the humidifying material for
discharge outside the case, a water level control having a
one-piece float assembly including a hub pivoted about a generally
horizontal axis to the case and a float connected by an arm to the
hub, a control element disposed adjacent the hub and engaged by a
chordal surface thereon when said float indicates a predetermined
inadequate water level in the container for terminating the
operation of the humidifier, means to control the operation of the
device, and a protective housing about the control means, said
housing including a unitary resilient but self-supporting element
and bracket means securing opposite side edges of the element to
the case, and opposing case walls abutting the interconnecting side
edges of the housing effective for isolating in a reasonable
fluidtight manner the control means from the water container.
3. In a device of the type described, the combination of a case, a
water holding container in the case, humidifying material disposed
to be moistened by the container water, wall means including a
venturi opening and a fan for moving air through the humidifying
material for discharge outside the case, a water level control
having a one-piece float assembly including a hub pivoted about a
generally horizontal axis to the case and a float connected by an
arm to the hub, a control element disposed adjacent the hub and
engaged by a chordal surface thereon when said float indicates a
predetermined inadequate water level in the container for
terminating the operation of the humidifier, an indicator drum
pivoted about a generally horizontal axis to the case and being
exposed through an opening in the case, and a link interconnecting
the hub and indicator drum.
4. In a device of the type described, the combination of a case,
wall means including a venturi opening and a fan for moving air for
discharge outside the case, said fan including a unitary mounting
bracket having a pair of elongated rods and an interconnecting
cross element near corresponding ends of the rods, means including
opposing case walls asymmetrically disposed on opposite sides of
the venturi opening and spaced apart a distance less than the rod
lengths and resilient grommets confined in openings in the walls
and snugly receiving the rods until said cross element abuts the
grommets adjacent thereto for locating the fan centrally of the
venturi opening.
5. A device of the type described according to claim 4, further
including a drum having an open periphery and an open transverse
diametrical wall disposed closely adjacent the wall means and over
the venturi opening, drum support means including a drive pulley
and idler pulley adapted to engage the inner edge of the open
diametrical wall to support the drum, means to rotate the drive
pulley to in turn rotate the drum in a direction to move the drum
over the idler pulley before the drive pulley, a radial flange on
the idler pulley extended outwardly adjacent the side edge of the
drum periphery, and the fan being operable to move air through the
drum periphery and outside the case.
6. In a device of the type described, the combination of a case, a
water holding container in the case, humidifying material disposed
to be moistened by the container water, wall means including a
venturi opening and a fan for moving air through the humidifying
material for discharge outside the case, means including a
humidistat operable responsive to humidity conditions of air
ambient the device to control the operation of the device, and a
protective housing about the control means, said housing including
a unitary resilient but self-supporting element and bracket means
securing opposite side edges of the element to the case, and
opposing case walls abutting the interconnecting side edges of the
housing and slightly compressing said housing effective for
isolating in a reasonable fluidtight manner the control from the
water container, and means securing one of the opposing case walls
so that the one wall is readily removable from the remainder of the
case.
7. In a device of the type described according to claim 6, further
including a water level control having a one-piece float assembly
including a hub pivoted about a generally horizontal axis to the
case and a float connected by an arm to the hub, a control element
disposed adjacent the hub and engaged by a chordal surface thereon
when said float indicates a predetermined inadequate water level in
the container for terminating the operation of the device, an
indicator pivoted to the case and exposed through an opening in the
case, and a link interconnecting the hub and indicator.
8. In a device of the type described, the combination of vertical
wall means having an air inlet opening, a water holding container
disposed adjacent the container below the opening, a generally
cylindrical drum having an open periphery and an open transverse
wall defined by a circular inner edge larger than said wall
opening, humidifying material over the drum periphery, a drive
pulley and an idler pulley each mounted on the wall means
vertically above the container on opposite sides of the opening and
having outwardly diverging faces on which the drum transverse wall
inner edge rides to removably hang the drum closely adjacent the
wall means with the inner edge encircling the inlet opening and
with the drum periphery extended both within and above the water,
means to rotate the drive pulley which in turn rotates the drum in
a direction to progressively wet the humidifying material and to
move the drum transverse wall inner edge over the idler pulley
before the drive pulley, a radial flange on the idler pulley
disposed laterally adjacent the diverging faces thereon and
extended outwardly to at least adjacent the circumferential side
edge of the drum periphery and being closely adjacent said side
edge suitable for conveying excess water from the side edge before
the same reaching the drive pulley, and means operable to move air
from the inlet opening through the humidifying material for
discharge outside the drum.
9. A device of the type described according to claim 8, further
including a water level control having a one-piece float assembly
including a hub pivoted about a generally horizontal axis to the
case and a float connected by an arm to the hub, a control element
disposed adjacent the hub and engaged by a chordal surface thereon
when said float indicates a predetermined inadequate water level in
the container for terminating the operation of the device, an
indicator drum exposed through an opening in the case, and a link
interconnecting the hub and indicator drum.
10. A device of the type described according to claim 8, further
including means including a humidistat operable responsive to
humidity conditions of air ambient the device to control the
operation of the device, and a protective housing about the control
means, said housing including a unitary resilient but
self-supporting element and bracket means securing opposite side
edges of the element to the case, and opposing case walls abutting
the interconnecting side edges of the housing effective for
isolating in a reasonable fluidtight manner the control means from
the water container.
Description
Portable humidifiers typically have a water container or reservoir
and a porous humidifying material wetted by this water. Air is
moved through the humidifying material typically by a fan centered
within a venturi opening. Moreover, water float and indicator
mechanisms typically are employed to stop the device when the water
level in the container becomes inadequate, a float actuating a
control switch and also moving a visual indicator which advises the
user of all water levels. Typically also, a humidistat responds to
humidity conditions ambient the device for automatic operation, and
suitable barriers must be established and maintained between the
humidistat and the moistened air within the humidifier case and
directly ambient the water container. Moreover, where a rotatable
drum supports the humidifying material on its periphery which
passes progressively through the container water, quiet but
uniformly reliable drive means must be available to rotate the drum
even for continued use.
This invention relates to specific structures for accommodating
these various functions of a humidifier or like device in an
improved manner, but yet of the type which can be economically
manufactured and easily assembled.
Specifically, a main object of this invention is to provide in a
humidifier device or the like having a fan centered relative to a
venturi opening, a unitary fan mounting bracket having spaced rods
supported within resilient grommets located in opposing top and
bottom case walls of the venturi opening, the bracket rods being
initially fitted into the top wall and then the bottom wall until
an interconnecting cross member between the rods engages adjacent
grommet to center the fan automatically of the venturi opening.
Another object of this invention is to provide in a humidifier
device or the like an improved water level indicator and control
including a unitary hub and float assembly where the hub has a
chordal surface that engages and actuates a control switch when the
water level in the container is inadequate, and where a visual
indicator pivoted to the case is connected by a link to the hub,
whereby nominal manufacturing tolerances of the various components
are sufficient to provide consistent results for different
assemblies even in the assembly line manufacture of same.
Another object of this invention is to provide in a humidifier
device or the like having a moisture sensitive control like a
humidistat an improved housing highly effective for isolating the
control from all but the desired ambient conditions, which housing
is economical and easily assembled and disassembled about the
control and which includes a resilient but self supporting element
secured at opposite edges by brackets or the like to the case and
sandwiched at the interconnecting edges between adjacent case walls
one wall of which typically is removable.
Another object of this invention is to provide in a humidifier
device or the like an improved drum for supporting and wetting a
humidifying surface, and to an improved support and drive for the
drum.
These and other objects of this invention will be more fully
understood after reviewing the following specification, including
as a part thereof the accompanying drawings, wherein:
FIG. 1 is a top plan view, partly broken away for the sake of
clarity, showing a preferred embodiment of the subject
invention;
FIG. 2 is a sectional view, as seen generally from line 2-2 in FIG.
1, showing the drum support structure;
FIG. 3 is a sectional view, as seen generally from line 3-3 in FIG.
1, showing more of the drum support structure and showing also the
motor and fan mounting structure;
FIG. 4 is a sectional view, as seen generally from line 4-4 in FIG.
1, showing more of the motor and fan mounting structure and showing
also the relationship thereto of the humidifying drum;
FIG. 5 is a sectional view, as seen generally from line 5-5 in FIG.
1, showing the liquid level indicator and automatic control
switch;
FIG. 6 is a sectional view, as seen generally from line 6-6 in FIG.
1, showing the humidistat control and housing therefor;
FIG. 7 is a view as seen generally from line 7-7 in FIG. 6; and
FIG. 8 is a plan view in development of half of the frame structure
used to form the humidifying drum.
Referring now specifically to FIGS. 1 and 5 of the drawings,
humidifier device 10 includes an exterior sheet metal case 12
having a hinged cover 14 with a louvered discharge opening 15
therein. An open top water container 16 is supported in the case,
and a drum 18 is rotatably carried by drive pulley 20 and idler
pulley 22 and slides on pin 23 so that its periphery 24 passes
through the container water. The drum periphery is open (typically
shown in FIG. 8 as a developed plan view of a ring section 26)
having spaced rim elements 27, a central supporting element 28 and
interconnecting cross elements 29. The drum itself is composed of
two identical ring sections 26 having the end cross elements 30 and
31 offset slightly from one another in a manner so that they
underlie and overlie one another (FIG. 3) and are bonded together.
A conical diffuser plate 32 (FIG. 2) closes one end of the drum,
being supported between two radial flanges 33 on the ring sections.
The opposite end of the drum is open and the flanges define the
inner edge of the drum which rides on the pulleys 20 and 22. The
periphery of the drum is covered with a mat 35 of humidifying
material which is porous and picks up water as the drum is rotated
through the container water.
The manner of support and rotation of the drum and the manner of
drawing outside air to within and through the wetted humidifying
material and forcing the humid air outside of the case through the
discharge opening 15 will now be described. A case wall 40 extends
across the humidifier and has a venturi opening 42 disposed therein
which is also open to the open end of the drum 18. The pulleys 20
and 22 are supported from the wall 40 to rotate about horizontally
disposed axes 43 and 44, respectively. Each pulley has diverging
faces 46 which engage the inside peripheral edge or flanges 33 of
the open face of the drum. A motor and drive train unit 47
connected to the drive pulley 20 rotates it to rotate the drum in a
counterclockwise direction as seen in FIG. 3. This passes the
wetted periphery of the drum leaving the water initially over the
idler pulley 22 before contacting the drive pulley 20. A radial
flange 48 is further formed on the idler pulley 22 and is adapted
to lie closely adjacent but spaced with clearance from a
circumferential rim 49 of the drum. This flange 50 serves a double
purpose of maintaining the drum within the pulleys while also
conveying away any excess drum water before it might reach the
drive pulley.
Air moving means is supported by a unitary bracket 52 consisting of
parallel cylindrical rods 54 having interconnecting cross members
56 and 57 adjacent the rod ends. A motor mounting plate 58 is also
connected between the rods such as by spot welding or the like, and
a motor 60 is bolted in place to the plate 58. Fan 62 is keyed to
the motor shaft and is adapted to rotate within the venturi opening
42 generally in a centered position. The bracket rods 54 extend
beyond opposing case walls 64 and 65, the walls having openings
within which grommets 66 of resilient material are secured, and the
rod ends are received within the grommets. The lower cross member
56 is spaced relative to the motor mounting plate 58, the lower
case wall 64 and the venturi opening 42 such that when it engages
its adjacent grommet 66, the fan is centrally mounted within the
venturi opening. To assemble the bracket the upper ends of the rods
need only be initially located within the upper wall grommets 66
and move axially until the lower ends of the rods clear the lower
case wall 64 and be fitted into the grommets, whereupon the bracket
is moved downwardly until located in place as determined by the
lower crossmember. With the vertically disposed rods, the motor and
bracket weight alone would maintain the motor centered, but for
safety reasons self-threading nuts 68 are threaded onto the
projected low ends of the rods. This mounting bracket is most
economically fabricated and assembled as a unitary component within
the humidifier device.
Also of significance in the subject invention is the float
mechanism used to determine the water level within the container
and to visibly indicate the same to the user. The particular
mechanism (FIG. 5) includes a unitary float assembly 70 having a
hub 72 pivoted about pin 73 to the case and a float 74 connected by
arm 75 radially of the hub. A control switch 77 is supported to the
case adjacent the hub, the hub being notched out in part and having
a chordal surface 78 disposed to engage and actuate the switch 77
when the float 74 is in its lower most position (as shown in FIG.
5) where the level of water in the container is inadequate. The
switch is hooked up appropriately in a typical control circuit to
terminate the operation of the motors 47 and 60 for the drum and
fan, respectively, when the water level is inadequate. When water
is added to the container (a removable spout 79 (FIGS. 1 and 3)
being provided next to the drum for this), the float rises within
the water to move the chordal surface 78 away from the switch
element 77 and change the circuit previously mentioned such that
the drum and fan motor means can operate as required by demand.
An indicator drum 80 further is pivoted on horizontal pin 81 to the
case and has a periphery visible through opening 82 in the
decorative case panel 83. A link 84 connects the drum and hub
together, so that appropriate markings on the drum would indicate
the level of water in the container. The economical one piece float
assembly and switch mounting location are of extreme importance
since even with the usual nominal manufacturing tolerances, the
water level control accuracy can be consistently maintained with
little if any adjustment required and the entire unit readily
assembled on a mass produced basis.
Also of extreme importance in the subject invention is the
protective housing for the typical control that operates the
humidifier responsive to certain humidity conditions. In this
regard, a humidistat 90 is located in an appropriate typical
circuit with the drum and fan motors to control the operation of
each when a nonsatisfied or satisfied demand for humidity is sensed
by the humidistat. The humidistat 90 is structurally located inside
the case but should sense and respond to the air ambient case. It
is necessary therefor to isolate to the best degree possible the
humidistat from the extremely humid case air directly exposed to
the open top container as well as the wetted matted surface on the
drum. An additional factor must be the relative ease and
adaptability of installation of this isolating housing so that
service of the parts is possible if desired.
As shown, humidistat 90 is mounted on case wall 92 (FIG. 6) with a
shaft extending through an opening in the case wall to be operated
for external adjustment by a control knob 95. A housing element 97
formed as an elongated or extruded L-shaped element of resilient
material such as polyvinyl chloride and having enlarged nubs 102 at
its opposite ends is positioned between the humidistat and the
interior of the case exposed to the water container. Brackets 104
secured to the adjacent case walls and presenting open tracks
receive the nubs upon sliding the housing axially of itself. This
secures the opposite nubed edges of the element 97 to the case. The
opposite interconnecting edges 107 of the element are sandwiched
between opposed case walls, such as the venturi wall 40 and a
removable backplate 108 held in place by screws 110. When plate 108
is positioned against the housing element, the entire element is
disposed under a slight compressive force as between the opposing
edges 107 to establish a very economical but highly effective
relatively fluidtight isolation of the humidistat 90 from the humid
case air.
Reviewing some of the important features of this invention, the
drum is formed economically of a diffuser plate 32 and two similar
latticed ring sections 26. The drum support and drive is both
economical and positive in that the idler pulley flange 48
precludes excess drum water from reaching the drive pulley. The
unitary fan support bracket is economical to manufacture and easy
to assemble. The one-piece float assembly and cooperating chordal
hub surface and control element provide for economic but reliable
and consistent low water level control of the humidifier device.
The snap together linkage between the float and indicator drum
offers visual indication of all water levels and yet is easily and
accurately assembled. And lastly, the resilient one piece self
supporting housing isolates most effectively the humidistat control
from the humid case air.
* * * * *