Note: Descriptions are shown in the official language in which they were submitted.
CA 02219682 1997-10-28
PCT Application
28076/S V667
SELF-EVACUATING VACUUM CLEANER
Field of the Invention
The present invention relates to vacuum cleaners, and more
particularly to wet/dry vacuum cleaners where liquid material in the tank of
the vacuum cleaner is pumped out to waste.
Background Art
Tank-type vacuum cleaners are capable of receiving dry materials
such as debris or dirt and may also be used for suctioning liquids. When
the tank is full, an upper vacuum assembly (which often includes a motor
and an air impeller) is removed and the contents are dumped out. If the
vacuum cleaner is used on liquid material, the tank, when at or near
capacity, may be very heavy so that lifting the tank, to pour the contents
into a sink or the like, is difficult. Even tilting the tank to pour the
contents into a floor drain may be unwieldy when the liquid level in the
tank is high.
One solution to the difficulties encountered in emptying liquid from
vacuum tanks has been to provide an outlet at the bottom of the tank. Such
a solution is satisfactory when the contents of the tank are emptied into a
floor drain; however, if no floor or other low-placed drain is available the
tank must be lifted to a sink or similar disposal site. In such cases the
C~ i
outlet at the bottom of the tank is of little value.
A second solution to emptying a vacuum tank of liquid is to provide
a pump, usually with a motor located outside of or in the bottom of the
tank. The pump removes liquid through a lower portion of the tank and
expels it through a hose to waste. While such pumps are generally
effective, they may be very costly. The pump requires not only a pump
impeller and hoses but also its own electric motor, power cords, and
CA 02219682 1997-10-28
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switches. The expense of such items may be significant in the context of
the overall cost of a vacuum cleaner, particularly those designed for
residential use. Such pumps may also reduce the effective capacity of the
vacuum tank or interfere with operation when the vacuum cleaner is used
on dry materials. In addition, it may also be necessary to provide costly or
complicated structures to prime the pump, if it is not located in the bottom
of the tank.
It may also be desirable to filter debris out of the liquid entering the
tank in order to minimize interference with the pump impeller. Vacuum
cleaners often have filter bags for capturing debris which sit inside the
tank. However, such bags are generally made of a paper-type material
and, therefore, are unsuitable for wet pick-up.
Summary of the Invention
In accordance with one aspect of the present invention, a vacuum
cleaner has an air impeller for creating low pressure in the vacuum cleaner.
The vacuum cleaner further includes a shaft extension which extends from
the air impeller and rotates with the air impeller, and a pump impeller,
mechanically connected to the air impeller by the shaft extension, for
drawing liquid to the pump impeller to expel the liquid.
A further aspect of the present invention may be to have the vacuum
cleaner include a tank for collecting material, an air impeller for creating
low pressure in the tank to draw material into the tank, a shaft extending
i
from the air impeller and rotating with the air impeller, and a pump
impeller, mechanically connected to the air impeller by the shaft, for
drawing liquid material out of the tank. The vacuum cleaner may further
include a source of mechanical force, in particular a motor, which drives
the air impeller and the pump impeller, an upper vacuum assembly for
carrying the motor and the air impeller, an upper pump assembly including
the pump impeller such that the upper pump assembly is attached to the
CA 02219682 1997-10-28
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upper vacuum assembly, and a pump adapter assembly having a fluid filter
and means for sending a priming fluid toward the pump impeller such that
the pump adapter assembly is removably attached to the upper pump
assembly. The vacuum cleaner further has a pump which includes the
pump impeller, an inlet to the pump near a lower portion of the tank, and
an outlet to the pump exterior to the tank wherein the material in the tank
is drawn into the pump inlet by the pump impeller and expelled from the
pump outlet.
In accordance with another aspect of the present invention, a
wet/dry vacuum cleaner has a tank for receiving vacuumed material, an
upper vacuum assembly, a motor and an air impeller carried by the upper
vacuum assembly, a pump for removing liquid material from the tank, and
the pump includes an upper pump assembly, including a pump impeller
wherein the upper pump assembly is attached to the upper vacuum
assembly, and a pump adapter assembly, removably attached to the upper
pump assembly, wherein the pump adapter assembly includes a pump inlet
tube communicating with a lower portion of the tank. The upper pump
assembly includes an impeller housing, and the pump adapter assembly
includes a pump fitting that communicates with an outlet to the tank and
that has a seal and an inlet tube with a seal, such that the seal on the inlet
tube separates and the seal on the pump fitting separates in order to
separate the upper pump assembly from the lower pump assembly. The
pump adapter assembly further includes a fluid filter and means for sending
a priming fluid toward the pump impeller.
In another aspect of the present invention the vacuum cleaner
includes a tank for collecting vacuumed material, a source of mechanical
force, an air impeller driven by the source of mechanical force for creating
a low pressure area in the tank to draw material into the tank, a pump
located in the tank and driven by the source of mechanical force, an inlet to
the pump near a lower portion of the tank, and an outlet to the pump
,.,~I.i ,.WwLrv,m.n ,.""hW.le».AWWwp..k.»
CA 02219682 2004-12-O1
64267-875
-4-
exterior to the tank, wherein liquid material in the tank is
drawn into the pumpwinlet by the pump impeller and expelled
through the pump outlet. The air impeller rotates about a
first shaft, the pump impeller rotates about a second shaft;
and the first shaft is essentially collinear with the second
shaft. The second shaft connects the air impeller to the
pump impeller. The vacuum cleaner may further include a
pump adapter assembly having a fluid filter, means for
sending a priming fluid toward the pump impeller, an inlet
tube including the inlet near a lower portion of the tank,
and an upper pump assembly including the pump impeller,
wherein the pump adapter assembly is removably attached to
the upper pump assembly. The vacuum cleaner may further
include an upper vacuum assembly wherein the upper vacuum
assembly carries the source of mechanical force, the air
impeller, and the upper pump assembly.
In accordance with a first broad aspect, the
invention provides a vacuum cleaner comprising: a tank for
collecting vacuumed material, the tank defining an inlet
through which the vacuumed material passes; a source of
mechanical force for driving a first and a second shaft,
wherein the first shaft is substantially collinear with the
second shaft; an air impeller housing defining an opening in
communication with the tank; an air impeller disposed in the
air impeller housing, secured to the first shaft, and driven
by the source of mechanical force for creating a low
pressure area in the tank to draw material into the tank; a
pump located in the tank, the pump having a pump impeller
which is secured to the second shaft and driven by the
source of mechanical force; an inlet to the pump disposed
within the tank and located near a lower portion of the
tank; and an outlet to the pump exterior to the tank;
wherein liquid material in the tank is drawn into the pump
,. . .,, """,..,., ,..,.~.*.~"~*"~,...,,""
CA 02219682 2004-12-O1
64267-875
-4a-
inlet by the pump impeller and expelled through the pump
outlet.
In accordance with a second broad aspect, the
invention provides a vacuum cleaner comprising: a tank for
receiving vacuumed liquid; an air impeller housing having an
opening in air flow communication with an interior of the
tank; a driven air impeller disposed inside the impeller
housing; a powered pump mounted proximate the air impeller,
the pump having a pump impeller, an inlet in communication
with a lower portion of the interior of the tank, and an
outlet through which pumped material exits the pump; and a
shaft mechanically connecting the air impeller to the pump
impeller.
Other features and advantages are inherent in the
vacuum cleaner claimed and disclosed or will become apparent
to those skilled in the art from the following detailed
description in conjunction with the accompanying drawings.
Brief Description of the Drawings
FIG.1 is a side elevational view of a vacuum
cleaner of the present invention;
FIG. 2 is a top plan view of a vacuum cleaner of
the present invention;
FIG. 3 is a side elevational view, partially in
section along the line 3--3 in FIG. 2;
FIG. 4 is a perspective view of an air impeller of
the present invention;
FIG. 5 is a partial view, partially in section,
showing an air impeller assembly of the present invention;
CA 02219682 1997-10-28
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FIG. 6 is a partial side view, partially in section and partially in
phantom, showing a switch actuation assembly of the present invention;
FIG. 7 is an exploded perspective view of a portion of the switch
actuation assembly;
FIG. 8 is a partial front view, partially broken away and partially in
phantom, of the switch actuation assembly;
FIG. 9A is a partial top plan view, partially in phantom, of the
switch actuation assembly;
FIG. 9B is partial top plan view, in section and partially in
phantom, of the switch actuation assembly;
FIG. 10 is a partial view, partially in section, showing a first half of
an outlet section of the present invention;
FIG. 11 is a bottom view, partially broken away and partially in
phantom of a ball valve in the position of Fig.. 10;
FIG. 12A is a partially broken away top view of the ball valve of
FIG. 3 with the ball valve in the closed position;
FIG. 12B is a top view similar to that of FIG. 12A with the ball
valve in the partially open position;
FIG. 12C is a top view similar to Figs. 12A and B showing the ball
valve in the open position;
FIG. 13 is a side elevational view, in section, of a pump adapter
assembly of the present invention;
FIG. 14 is a exploded view of a pressure differential apparatus of
the pump adapter assembly of FIG. 13;
FIG. 15A is an enlarged view of the pressure differential apparatus
of FIG. 13;
FIG. 15B is a cross-section taken along the line A--A of FIG. 15A
of the pressure differential apparatus;
FIG. 15C is a sectional view similar to FIG. 15B showing the
pressure differential apparatus partially filled with liquid;
CA 02219682 1997-10-28
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FIG. 16 is a view similar to FIG. 3 with a collection bag and the
pump adapter assembly installed and a hose attached;
FIG. 17 is a perspective view of the collection bag of the present
invention;
FIG. 18A is a perspective view of the collection bag with a closure
flap in a open position;
FIG. 18B is a front elevational view of the collection bag with the
closure flap in a closed position;
FIG. 19A is a partial front view, partially broken away and partially
in phantom, of the switch actuation assembly in an "OFF" position;
FIG. 19B is a partial side view, partially in section and partially in
phantom, of the switch actuation assembly in an "OFF" position;
FIG. 20A is a partial front view, partially broken away and partially
in phantom, showing the switch actuation assembly transitioning from the
"OFF" to the "ON" position;
FIG. 20B is a partial side view, partially in section and partially in
phantom, showing the switch actuation assembly transitioning from the
"OFF" to the "ON" position;
FIG. 21A is a partial front view, partially broken away and partially
in phantom, of the switch actuation assembly in an "ON" position;
FIG. 21B is a partial side view, partially in section and partially in
phantom, of the switch actuation assembly in an "ON" position;
FIG. 22A is a partial front view, partially broken away and partially
in phantom, showing the switch actuation assembly transitioning from the
"ON" to the "OFF" position;
FIG. 22B is a partial side view, partially in section and partially in
phantom, showing the switch actuation assembly transitioning from the
"ON" to the "OFF" position;
CA 02219682 1997-10-28
_ 7 _
FIG. 23A is a partial front view, partially broken away and partially
in phantom, of a mechanical shut-off and override assembly of the present
invention in an "ON" position;
FIG. 23B is a partial side view, partially in section and partially in
phantom, of the mechanical shut-off and override assembly in an "ON"
position;
FIG. 24A is a partial front view, partially broken away and partially
in phantom, of the mechanical shut-off and override assembly moved to the
"OFF" position due to an excessively high liquid level;
FIG. 24B is a partial side view, partially in section and partially in
phantom, of the mechanical shut-off and override assembly moved to the
"OFF" position due to an excessively high liquid level;
FIG. 25A is a partial front view, partially broken away and partially
in phantom, showing the mechanical shut-off and override assembly
bypassing the mechanical shut-off; and
FIG. 25B is a partial side view, partially in section and partially in
phantom, showing the mechanical shut-off and override assembly bypassing
the mechanical shut-off.
Description of the Preferred Embodiment
Referring initially to Figs. 1 and 2, a vacuum cleaner of the present
invention, indicated generally at 30, has a tank 32 and an upper vacuum
assembly, indicated generally at 34.
The tank 32 is supported by casters 36 and includes a pair of
handles 38. The handles 38 may be used to assist the user in lifting and
moving the vacuum cleaner 30. The tank 32 further defines an inlet 40 and
a number of latch recesses 42. The inlet 40 may be fitted with a vacuum
hose (not depicted) for applying suction at desired locations.
The tank 32 supports the upper vacuum assembly 34. The upper
vacuum assembly 34 includes a lid 44, a motor housing 46, a cover 48,
CA 02219682 1997-10-28
_g_
and a handle 50. The upper vacuum assembly 34 may be of conventional
construction. Except for the pump, mechanical shut-off and override
system, and priming apparatus described below, the upper vacuum
assembly 34 and its associated components may be similar to a Shop Vac
Model QL20TS vacuum cleaner as manufactured by Shop Vac Corporation
of Williamsport, Pennsylvania. The lid 44 makes up the bottom of the
upper vacuum assembly 34 and carries one or more latches 52. The motor
housing 46 is connected to the top of the lid 44. The cover 48, in turn, is
connected to the top of the motor housing 46, and finally, the handle 50
sits atop the cover 48. When a user wishes to connect the upper vacuum
assembly 34 to the tank 32, the user lifts the upper vacuum assembly 34
above the tank 32, aligns the latches 52 with the latch recesses 42, lowers
the upper vacuum assembly 34 until the lid 44 rests on top of the tank 32,
and then, fastens the latches 52 to the tank 32.
The motor housing 46 defines a pair of blower air discharge slots
54. Air drawn into the vacuum cleaner 30 by the inlet 40 is expelled
through the blower air discharge slots 54 as shown by the arrow BA in Fig.
1. Also, the motor housing 46 has a pump outlet 56 and a three position
ball valve 58 extending therefrom. The cover 48 of the upper vacuum
assembly 34 provides a housing for a switch actuation assembly 60 (Fig.
3), described in detail below, which includes a user engageable actuator 62
(Fig. 2), and extending outward from the cover 48 is an electric cord 64.
The electric cord 64 passes through a relief 65 in the cover 48 and may be
permanently attached to the motor housing 46 or detachably connected
thereto. The motor housing 46 and the cover 48 may be formed as two
separate, detachable pieces or as one piece, integral with one another.
With either construction, the motor housing 46 and the cover 48 define an
air passage 66 which allows air to enter and exit the cover 48, as shown by
the arrows CA in Fig. 1.
CA 02219682 1997-10-28
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Referring now to Figs. 3-5, disposed in the upper vacuum assembly
34, among other things, is an air impeller assembly 68. The air impeller
assembly 68 includes a housing 70 defining an opening 72, an air impeller
74, a motor shaft 76, a shaft extension 78, a flanged washer 80, and a pair
of flat washers 82 (Fig. 5). (If desired, the vacuum cleaner 30 may
alternatively use multiple air impellers.) The air impeller 74 has an upper
plate 84 and a lower plate 86 with a series of blades 88 disposed between
the upper and lower plates 84,86 (Fig. 4). The upper plate 84 defines a
first opening 90, and the lower plate 86 defines a second opening 92 having
a diameter larger than that of the first opening 90. The motor shaft 76 is
connected to a motor 93 at one end (Fig. 3 -- depicting a lower portion of
the motor 93) and is threaded at the other end 94 (Fig. 5). The shaft
extension 78 defines a threaded receptacle 96 and also has a threaded end
98 (Fig. 3).
The air impeller 74 is disposed within the housing 70 (Fig. 5). The
threaded end 94 of the motor shaft 76 extends through the first opening 90
of the air impeller 74. The shaft extension 78 is secured to the motor shaft
76 by the engagement of the threaded end 94 of the motor shaft 76 with the
threaded receptacle 96 of the shaft extension 78. Disposed between the
upper plate 84 and the shaft extension 78 is one of the flat washers 82.
The other flat washer 82 and the flanged washer 80 encircle the motor shaft
76 and are disposed between the upper plate 84 and a motor bearing 102
(Fig. 3). From the motor shaft 76, the shaft extension 78 extends through
the second opening 92 of the air impeller 74, out through the opening 72 of
the housing 70, and connects to a pump impeller 104 by way of the shaft
extension threaded end 98 (Fig. 3). As such, the motor 93 supports the air
impeller 74 and the pump impeller 104 and drives both via the motor shaft
76 and the shaft extension 78. Alternatively, the shaft extension 78 may be
formed integral with the motor shaft 76 so that a unitary structure drives
the air impeller 74 and the pump impeller 104. Another alternative is for
CA 02219682 1997-10-28
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the shaft extension 78 to be offset from the motor shaft 76, and torque is
then transferred from the motor shaft 76 to the shaft extension 78 via a
transmission or a gear train.
Referring to Fig. 3, the upper vacuum assembly 34 also includes a
y 5 lid cage 106 which is integrally formed with the lid 44 and extends
downward therefrom. The air impeller assembly 68 is disposed within the
lid cage 106, and the air impeller 74 draws air through the lid cage 106.
The lid cage 106 includes several braces 108 that support a bottom plate
110, and the bottom plate 110 defines a first oblong opening 112 and a
second larger opening 114. A foam filter 116 surrounds the circumference
of the lid cage 106, and a cloth filter 118 may be placed around the lid
cage 106 during dry use of the vacuum cleaner 30 to keep dust from
entering the opening 114. Instead of using a separate foam filter 116 and
cloth filter 118, an alternative would be to use a unitary cartridge filter
that
would be easily replaceable.
Also included within the lid cage 106 is an upper pump assembly
indicated generally at 120. A pump mount 122 attaches the upper pump
assembly 120 to the air impeller housing 70. The upper pump assembly
120 includes the pump impeller 104, an upper impeller housing 124, and a
lower impeller housing 126. The pump impeller 104 is made of nylon 6,
and the upper and lower impeller housings 124, 126 are preferably made
from acrylonitrile-butadiene styrene copolymer ("ABS"). The pump
impeller 104 has a threaded receptacle 128 and a series of blades 130; the
upper impeller housing 124 defines an opening 132; and the lower impeller
housing 126 includes an inner annular wall 134 and an outer annular wall
136. The outer annular wall 136 flares out to create a flared portion 138.
The lower impeller housing 126 is attached to the upper impeller housing
124, and in this embodiment, the two are threaded together. The threaded
end 98 of the shaft extension 78 extends through the opening 132 in the
upper impeller housing 124 and is in engagement with the threaded
CA 02219682 1997-10-28
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receptacle 128 of the pump impeller 104. As a result, the pump impeller
104 is suspended between the upper impeller housing 124 and the lower
impeller housing 126, allowing the pump impeller 104 to rotate freely.
The diameter of the shaft extension 78 and the diameter of the opening 132
are sized such that an annular gap 140 having a diametral clearance on the
order of 0.030 inches is created between them. The clearance in the gap
140 may fluctuate +/- 0.015 inches due to the tolerances allowed in the
manufacture of the shaft extension 78 and the opening 132. The gap 140 is
intentionally unsealed so that fluid is permitted to freely flow from inside
the upper impeller housing 124 to outside the upper impeller housing 124.
With the gap 140, there is no contact between the shaft extension 78 and
the upper impeller housing 124. The lack of contact between the two
prevents the generation of frictional heat and, therefore, reduces the need
for cooling at the gap 140. Further significance of the gap 140 is explained
in detail below. A deflector 142, formed integrally with the pump mount
122, is used to keep any liquid which splashes up through the gap 140 from
entering the air impeller assembly 68.
The upper vacuum assembly 34 also houses a mechanical shut-off
and override assembly indicated generally at 144. The mechanical shut-off
and override assembly 144 includes the switch actuation assembly 60, a
float rod 146 and a float 148. The switch actuation assembly 60 is located
in the cover 48, and the float 148 rests on the bottom plate 110 of the lid
cage 106 with the float rod 146 passing through the lid 44 and the motor
housing 46, providing a linkage between the switch actuation assembly 60
and the float 148.
Referring to Figs. 6-9B, the switch actuation assembly 60 is shown
in greater detail. It should be understood that Fig. 6 (as well as Figs. 19B-
25B) does not depict a true sectional view of the switch actuation assembly
60; rather, Fig. 6 is an illustration of the switch actuation assembly 60
composed to assist in explaining the interrelation of the switch actuation
CA 02219682 1997-10-28
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assembly elements. The precise alignment of some of the components of
the switch actuation assembly 60 are shown in the exploded view of Fig. 7.
The switch actuation assembly 60 includes a switch mount 150 (Fig. 6), a
switch 152, a toggle 154, a link 156 (Fig. 6), a spring member 158 (Fig.
6) and the user engageable actuator 62 (Fig. 6). In the preferred
embodiment, the switch mount 150, the toggle 154, and the link 156 are
preferably made from ABS, the user engageable actuator 62 is preferably
made from nylon 6/6, and the spring member 158 is preferably made from
nylon. The switch mount 150 is made from two parts: a switch box 160
and a switch cover 162 (Fig.7). Extending inward from and integrally
formed with the switch box 160 is a switch box spacer 164, a first switch
support rod 166, and a toggle spacer 168 including a toggle stop 170.
Extending outward from the switch box 160 is an axle receptacle 172 and a
connection flange 174 which defines a bolt hole 176 (Fig.6). The switch
cover 162 is wedge shaped and has an inner wall 178 and an inclined outer
wall 180 (Fig. 7). Cut into the outer wall 180 is a slot 182. The bottom
of the slot 182 is defined by a connection flange 184, which also defines a
bolt hole 186. Extending inward from and integrally formed with the
switch cover inner wall 178 is a second switch support rod 188 and a
toggle axle 190 (Fig. 6). The end of the toggle axle 190 seats in the axle
receptacle 172 of the switch box 160. Extending outward from and
integrally formed with the switch cover outer wall 180 is a link fastener
192. The switch cover 162 further defines an opening 194 which
communicates with the slot 182. The switch cover 162 is connected to the
switch box 160 by a pair of screws 193 to form the switch mount 150.
The switch mount 150, in turn, is secured to the motor housing 46 by a
pair of bolts 196 which extend through the connection flanges 174, 184 and
into the motor housing 46 (Fig. 3).
Referring to Fig. 8, the switch 152 is a standard electrical
microswitch and includes an axle bore 198, a support bore 200, a
CA 02219682 1997-10-28
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momentary actuator 202, an internal spring 204, and a pair of electrical
terminals 206a, 206b. The switch 152 is of the type that the switch is
normally in the "OFF" position and is "ON" only while the momentary
actuator 202 is depressed. Once the actuator 202 is released, the internal
spring 204 pushes the actuator 202 outward and returns the switch 152 to
the normally "OFF" position. In the preferred embodiment, a Unimax
Model #TMCJG6SP0040Y made by C&K/Unimax Inc. of Willingford,
Connecticut, is used. The switch 152 is securely seated in the switch
mount box 150, and is supported by the first and second switch support
rods 166, 188, which are disposed in the support bore 200 (Fig. 6), and the
toggle axle 190, which is disposed in the axle bore 198.
Referring to Figs. 7 and 8, the toggle 154 is generally U-shaped and
includes a back wall 208 which defines a rod receiving extension 210 (Fig.
8) for receiving the float rod 146 (Fig. 6), a pair of sidewalk 212a, 212b,
and a locking brace 214 spanning between the sidewalls 212a, 212b. Both
sidewalls 212a, 212b define an axle opening 216a, 216b, and a boss 218
extends outward from one sidewall 212a (Fig. 7). The toggle 154 is
disposed in the switch mount 150 with the pair of sidewalk 212a, 212b
disposed on opposite sides of the switch 152, the sidewall 212b spaced
away from the switch box 160 by the toggle spacer 168, and the locking
brace 214 disposed beneath the switch 152 (Fig. 6). As such, the toggle
axle 190 extends through the axle openings 216a, 216b, and the boss 218
extends through the opening 194 in the switch cover 162 (Fig. 6). As seen
specifically in Fig. 8, the locking brace 214 includes a ramp portion 220
and a locking portion 222 with the locking portion 222 intersecting the
ramp portion 220 at a critical point CP. In the preferred embodiment, the
included angle between the ramp portion 220 and the locking portion 222 is
approximately 158 degrees, although this dimension may vary from such
value, as will be apparent to one of ordinary skill in the art. The angle
between the ramp portion 220 and the locking portion 222 is such that
CA 02219682 1997-10-28
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when the toggle 154 is fully rotated counter-clockwise, as seen in Fig.
20A, the ramp portion 220 lies flush against the bottom surface of the
switch 152.
Referring to Figs. 6-9B, the link 156 defines an elongated slot 224
and a boss slot 226, and extending outward from the link 156 is a spring
member receptacle 228. The link fastener 192 is disposed in the elongated
slot 224, and connects the link 156 to the switch mount 150. The
elongation of the slot 224 allows the link 156 to slide up and down in
relation to the switch mount 150. Also, the boss 218 of the toggle 154
extends through the boss slot 226 (Fig. 6).
Referring to Figs. 6, 9A, and 9B, the spring member 158 includes
an actuator stem 230, a linkage web 232, a tongue 234, an upper spring
236, a lower spring 238, and a pair of siderails 240 (Fig. 9). The linkage
web 232 connects the actuator stem 230, the tongue 234, the upper spring
236, the lower spring 238, and the siderails 240 together. The upper
spring 236 and the lower spring 238 both curve outward from the linkage
web 232 and backward from the tongue 234 toward the end of the actuator
stem 230 (Fig. 6). The upper and lower springs 236, 238 are both
disposed in a slot 242 formed in the cover 48 with the actuator stem 230
extending through the slot 242. The upper spring 236 engages a top lip
244 of the slot 242 creating a first load, while the lower spring 238
engages a bottom lip 246 of the slot 242 creating a second load. In the
preferred embodiment, the first load and the second load are equally
balanced, centering the user engageable actuator 62 in the slot 242 when
the user engageable actuator 62 is not engaged. On the other end, the
tongue 234 is disposed in the spring member receptacle 228 (Fig. 6). The
user engageable actuator 62 includes an engageable portion 248 coupled to
a hollow stem coupler 250. The hollow stem coupler 250 extends inwardly
through the cover slot 242 and is disposed around the actuator stem 230 of
the spring member 158. The engageable portion 248 of the user
CA 02219682 1997-10-28
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engageable actuator 62 is disposed on the outside of the cover 48, and the
siderails 240 engage the inside of the cover 48 creating a snug fit between
the spring member 158 and the cover 48 (Fig. 9).
Referring again to Fig. 3, the float 148 is hollow and may be made
of any suitable material, such as copolymer polypropylene. The float 148
defines a rod receptacle 252 in which the float rod 146 sits. The float rod
146 moves in an unrestricted, non-contained linear up-and-down path in the
preferred embodiment. However, other embodiments are envisioned in
which the float rod 146 would travel in a linear up-and-down path in a
contained channel or guidance slot.
Referring to Fig. 3, the upper vacuum assembly 34 also encloses a
first half 254 of an outlet section 256 (Fig. 16). Referring to Figs. 10 and
11, the first half 254 of the outlet section 256 includes a housing 258, the
ball valve 58, and an elbow 260. The housing 258 defines the pump outlet
56, a ball seat 262, and an elbow cavity 264. The housing 258 further
includes an inlet 266 extending downward from the housing 258 and a
threaded portion 268 disposed around the exterior of the housing 258. The
inlet 266 defines a bore 270 and has a check valve 272, which prevents air
or liquid from the elbow 260 or the pump outlet 56 from escaping through
the inlet 266. The ball valve 58 includes a knob 274 having three dogs
276a-c attached to a ball 278 having a passageway 280 bored therethrough
for opening and closing the valve 58. The knob 274 is disposed outside the
housing 258 while the ball 278 is seated in the ball seat 262 of the housing
258. A pair of O-rings 282, 283 situated between the ball 278 and the
housing 258 creates a seal between the ball 278 and the housing 258.
Similarly, an O-ring 285 situated between the knob 274 and the housing
258 creates a seal between the knob 274 and the housing 258. The elbow
260 defines a passageway 284 and an adapter receptacle 286. Extending
outward from and integral with the elbow 260 are a housing closure 288, a
sealing flange 290 having an O-ring 292, and a pair of connectors 294
CA 02219682 1997-10-28
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(Fig. 11). The elbow 260 is secured in the elbow cavity 264 of the
housing 258 with screws 295 (Fig. 11) such that the elbow 260 abuts the
O-ring 282 forming a seal with the ball 278 and putting the passageway
284 in communication with the ball 278. Also, the O-ring 292 forms a seal
$ between the elbow 260 and the housing 258, and the housing closure 288
G
caps off the housing 258. The first half 254 of the outlet section 256 is
secured within the motor housing 46 by screwing a pair of screws 297
through the connectors 294 and into a pair of bosses 296 in the motor
housing 46 (Fig. 3). The housing 258 extends through an opening 298 in
the motor housing 46, and the adapter receptacle 286 extends through an
opening 300 in the lid 44 (Fig. 3). A hose 302 may be connected to the
housing 258 by securing a connector 304 to the threaded portion 268 of the
housing 258 (Fig. 16). The connector 304 may be of a threaded ring type
found on the ends of garden hoses.
The dogs 276a-c of the knob 274 serve to indicate the angular
position of the passageway 280 inside the housing 258. As illustrated in
Fig. 12A, the dog 276a is aligned with the pump outlet 56, and the ball
278 prevents fluid from flowing from the elbow 260 to the pump outlet 56
or vice versa. Fluid is prevented from flowing past the ball in this position
because the passageway 280 is perpendicular to the passageway 284, and
the ball 278 forms a seal with the housing 258.
When the dog 276b is aligned with the pump outlet 56, as illustrated
in Fig. 12B, the passageway 280 is at a 45° angle to the passageway
284,
1
permitting only partial fluid flow from the elbow 260 to the pump outlet
56. Also, as seen in Fig. 10, when the ball 278 is in this position, the
check valve 272 allows air in through the inlet 266 and into the elbow 260.
The ball 278 in Fig. 10 has not been sectioned so that the path air may
travel through the inlet 266 to the elbow 260 may be seen more clearly.
. The arrows in Figs. 10 and 1 i each show the path air takes after entering
through the inlet 266. After entering through the inlet 266, air passes
CA 02219682 1997-10-28
-17-
through the check valve 272 and then proceeds around the outside of the
ball 278, across the passageway 280, and into the passageway 284. Air
may pass by the ball 278 in this position because opposing end sections of
the ball 278 have been removed in creating the passage 280. As such, in
this position, the ball 278 does not create a complete seal with the housing
258.
When the dog 276c is aligned with the pump outlet 56, as illustrated
in Fig. 12C, the passageway 280 is aligned with the passageway 284,
permitting full fluid .flow from the elbow 260 to the pump outlet 56.
Fig. 13 depicts a pump adapter assembly 306 which includes a
pump fitting 308, a lower inlet tube 310, a pressure differential apparatus
312, a conduit 314, and a second half 316 of the outlet section 256. The
pump fitting 308, which is preferably made from ABS, includes an upper
inlet tube 318 and an outer annular wall 320 that encircles the bottom half
of the upper inlet tube 318 and is formed integrally therewith. Both the
upper inlet tube 318 and the outer annular wall 320 have an O-ring 322,
324 disposed in respective grooves 326, 328 formed in each one's upper
ends. At the end opposite the O-ring 322, the upper inlet tube 318 inserts
into the lower inlet tube 310. Extending outward from the outer annular
wall 320 is a pair of flanges 330, 332. The upper flange 330 is oblong in
shape, and the lower flange 332 is radial with the greatest diameter of the
upper flange 330 being smaller than the diameter of the lower flange 332.
The outer annular wall 320 is also attached to and in fluid communication
with a pump connector 334 of the second half 316 of the outlet section 256.
As best seen in Figs. 14, 15A, 15B, and 15C, the pressure
differential apparatus 312 includes a hollow body 336 closed by a bottom
plate 338 to form a cavity for a ball 340. The hollow body 336 includes an
opening 342 in which the ball 340 may seat (Fig. 15C). The hollow body
336 also has upward extending fittings 344, 346 (Fig. 15A), which define
openings 348, 350 (Fig. 15A), for attaching, respectively, the lower inlet
CA 02219682 1997-10-28
-18-
tube 310 and the conduit 314. A top plate 352 is attached to the hollow
body 336 by screws 353. As best seen in Fig. 14, the top plate 352 has
openings 354, 356 through which the inlet tube 310 and the conduit 314
respectively pass. The top plate 352 and the bottom plate 338 enclose a
filter 358 ensuring that any liquid passing into the hollow body 336 through
the opening 342 also passes through the filter 358.
Returning now to Fig. 13, the second half 316 of the outlet section
256 includes the pump connector 334, a flexible tube 360, and a rotatable
connector 362. The pump connector 334 attaches to the outer annular wall
320 of the pump fitting 308 at one end, as described above, and attaches to
the flexible tube 360 at the other end. The other end of the flexible tube
360 attaches to the rotatable connector 362. The pump connector 334
includes a check valve 364 and a conduit fitting 366. The check valve 364
permits fluid flow from the pump fitting 308 into the pump connector 334,
but the check valve 364 does not permit fluid flow from the pump
connector 334 into the pump fitting 308. The conduit 314, at one end,
connects to the conduit fitting 366 of the pump connector 334. The conduit
fitting 366 is disposed on the outlet side of the check valve 364 so that any
fluid passing down through the flexible tube 360 can pass into the conduit
314 without being blocked by the check valve 364. The conduit 314, at the
other end, fits into the fitting 346 in the hollow body 336. In between the
two conduit ends, a clamp 368 holds the conduit 314 against ,the lower inlet
tube 310.
The vacuum cleaner 30 may be operated in two modes: dry and wet
vacuuming mode. Fig. 3 shows the vacuum cleaner 30 in dry mode
configuration. The ball valve 58 is in a closed position to maintain the
pressure differential in the tank 32, and the cloth filter 118 is in place
around the lid cage 106 to keep dust from entering the opening 114. To
convert the vacuum cleaner 30 to wet mode operation, the cloth filter 118
is removed, and the pump adapter assembly 306 is installed (Fig. 16). To
CA 02219682 1997-10-28
-19-
install the pump adapter assembly 306 and create a pump indicated
generally at 372, the user first inserts the pump fitting 308 through the
openings 112, 114 in the lid cage bottom plate 110 and into the lower
impeller housing 126 of the upper pump assembly 120. The flared portion
138 of the upper pump assembly 120 facilitates insertion of the pump
adapter assembly 306 into the lower impeller housing 126. During
insertion, the upper inlet tube 318 slides within the inner annular wall 134
of the lower impeller housing 126, and the O-ring 322 forms a seal with
the inner annular wall 134. Similarly, the outer annular wall 320 of the
pump fitting 308 slides within the outer annular wall 136 of the lower
impeller housing 126, and the O-ring 324 forms a seal with the outer
annular wall 136. Lastly, the radial flange 332 seats in the opening 114.
To secure the pump adapter assembly 306 to the lid cage 106, the
user twists the pump adapter assembly 306 ninety degrees, causing the
pump fitting 308 to also turn placing the oblong flange 330 in contact with
the bottom plate 110 of the lid cage 106. To finish connecting the pump
adapter assembly 306 to the upper vacuum assembly 34, the user
manipulates the rotatable connector 362 and inserts the rotatable connector
362 into the adapter receptacle 286. The completed pump 372 includes a
priming chamber 374 and a discharge recess 376. The priming chamber
374 is defined by the cooperation of the upper inlet tube 318, the O-ring
322, the inner annular wall 134, and the pump impeller 104. The
discharge recess 376 is defined by the cooperation of the outer annular wall
136 of the lower impeller housing 126, the O-ring 324, and the outer
annular wall 320 of the pump fitting 308. The dimension of each of the
parts of the pump 372 will be dependent on the desired flow rate of the
pump 372. In addition, the power of the motor 93 may also affect the size
and design of many components, including the pump impeller 104.
If the user desires to filter large particulate material out of the
material being drawn into the vacuum cleaner 30, the user may install a
CA 02219682 1997-10-28
-20-
mesh collection bag 370 into the tank 32 (Fig. 16). Referring to Figs. 17,
18A, and 18B, the mesh collection bag 370 includes a filter section 378, a
closure flap 380, and an inlet collar 382. The filter section 378 includes a
front portion 384 and a back portion 386. Three edges 388a-c of the front
and back portions 384, 386 are permanently connected together. The
closure flap 380 is an elongated section of the back portion 386 of the filter
section 378 and is disposed opposite a fourth edge 389 of the front portion
384 to form an opening 391. The dimensions of the apertures in the mesh
of the filter section 378 are preferably approximately 0.5 mm by 1 mm.
The filter section 378 is made from nylon or other material which is strong
and not water soluble. The filter section 378 is generally rectangular in
shape and is sized so that the bottom of the filter section 378 just touches
the bottom of the tank 32 when installed (Fig. 16). The inlet collar 382
includes a first and second portion 393a, 393b (Figs. 18A and 18B). The
1~ first portion 393a of the inlet collar 382 is a rigid reinforcement piece,
which may be made of a hard plastic material, which defines an opening
397 and is centered on an outer surface 395 of the closure flap 380 (Fig.
18B). The second portion 393b of the inlet collar 382 is attached to the top
center of the front portion 384 of the filter section 378 and defines an
opening 399 (Fig. 18A). The second portion 393b of the inlet collar 382
has a gummy flexible sleeve 392, which may be made of a rubber material,
and a rigid reinforcement portion 394, which may also be made of a hard
plastic material, with the sleeve 392 being sandwiched between the
reinforcement portion 394 and the front portion 384 of the filter section
378. To install the mesh collection bag 370, the user first folds the closure
flap 380 over the opening 391 and the fourth edge 389 of the front portion
384. The user then places the mesh collection bag 370 into the tank 32 and
spreads the mesh collection bag 370 around the inner circumference of the
tank 32 (Fig. 16). The user then aligns the openings 397, 399 of the inlet
collar 382 with the inlet 40 of the tank 32 and slides the inlet collar 382
CA 02219682 1997-10-28
-21 -
over the inlet 40. The flexible sleeve 392 will stretch outward as the inlet
collar 382 is pushed onto the inlet 40. Once the inlet collar 382 is in
place, the sleeve 392 has a diameter small enough and is made from a
material gummy enough to securely grip the inlet 40. Finally, to complete
preparation of the vacuum cleaner 30 for wet mode operation, the user
inserts the combined upper vacuum assembly 34/pump adapter assembly
306 into the tank 32 and then secures the lid 44 to the tank 32 with the
latches 52 as described above (Fig. 16).
To operate the vacuum cleaner 30 in wet mode operation (operation
of the switch actuation assembly 60 is the same for dry mode operation),
the user first turns the motor 93 "ON" by turning the switch 152 "ON".
The switch actuation assembly 60 is initially in the "OFF" position as
illustrated in Figs. 19A and 19B. In the "OFF" position, the locking brace
214 of the toggle 154 is not engaging the momentary actuator 202 and the
user engageable actuator 62 is centered in the slot 242 by the equally
balanced upper and lower springs 236, 238. As illustrated in Figs. 20A
and 20B, to turn the motor 93 "ON", the user presses upward on the
engageable portion 248 of the user engageable actuator 62. The upward
force is transmitted to the spring member 158 and to the link 156. The
upward force on the spring member 158 presses the upper spring 236
against the top lip 244 of the slot 242, creating a load. The upward force
on the link 156 moves the boss slot 226 upward. As the boss slot 226
moves upward, the boss slot 226 engages the boss 218 of the toggle 154.
Continued upward movement of the boss slot 226 moves the boss 218
upward and causes the toggle 154 to rotate counter-clockwise (as seen in
Figs. 20A and B) around the toggle axle 190 (Fig. 6). The top of the
opening 194 in the switch cover 162 keeps the user from pulling the boss
218 too far upward and prevents possible damage to the switch 152 by
keeping the toggle 154 from pressing too far upward on the switch 152.
The counter-clockwise rotation of the toggle 154 moves the ramp portion
CA 02219682 1997-10-28
-22-
220 into engagement with the momentary actuator 202, pressing the
momentary actuator 202 into the switch 152. Continued counter-clockwise
rotation of the toggle 154 slides the ramp portion 220 laterally along the
momentary actuator 202. Eventually, the momentary actuator 202 passes
the critical point CP and comes in contact with the locking portion 222 of
the locking brace 214. At this point, the momentary actuator 202 is no
longer resisting the counter-clockwise rotation of the toggle 154; rather, the
momentary actuator 202 is now locking the toggle 154 against the switch
152 by pushing downward on the locking brace 214, causing the
momentary actuator 202 to remain depressed (Figs. 20A and 20B). The
depressed momentary actuator 202 turns the switch 152 "ON", which in
turn supplies power to the motor 93. Once the user releases the user
engageable actuator 62, the load created on the upper spring 236 is
released, and the spring member 158 re-centers the user engageable
actuator 62 in the slot 242 (Figs. 21A and 21B).
The energized motor 93 simultaneously turns the air impeller 74 and
the pump impeller 104 via the motor shaft 76/shaft extension 78
combination (Fig. 16). The rotating air impeller 74 reduces the pressure in
the tank 32, creating a vacuum. The vacuum draws air, liquid and/or other
material into the tank 32 through the inlet 40. As material is sucked into
the tank 32 through the inlet 40, the mesh collection bag 370 filters out any
exceptionally large particulate material to reduce the possibility of clogging
the pump 372. Even if the pump 372 is not used, the mesh collection bag
370 can be used to easily filter large particulate material out from the
liquid
in the tank 32 so that when the tank 32 is poured or emptied into a drain
the large particulate material will not clog the drain. The air that is drawn
into the tank 32 passes through the foam filter 116, through the lid cage
106, into the motor housing 46, and finally is expelled out of the discharge
slots 54 (Fig. 1).
CA 02219682 1997-10-28
-23-
The pump 372 is a self priming pump under most conditions.
Referring to Figs. 15C and 16, when the ball 340 seats in the opening 342
a high-pressure system is created in the passageway 284, the flexible tube
360, and the conduit 314 by air under atmospheric pressure being trapped
~I S between the closed ball valve 58 (Fig. 12A) and the liquid collecting in
the
hollow body 336 of the pressure differential apparatus 312. Meanwhile, a
low pressure system is created in the inlet tubes 310, 318 since the gap 140
in the upper impeller housing 124 places the inlet tubes 310, 318 in
communication with -the low-pressure area created by the air impeller 74.
The low-pressure air trapped in the inlet tubes 310, 318 does not create
enough head to pull the liquid collected in the hollow body 336 up through
the inlet tubes 310, 318 to prime the pump 372. The check valve 364 acts
to keep the low-pressure system created in the inlet tubes 310, 318 separate
from the high-pressure system created in the passageway 284, the tube 360,
and the conduit 314. The high-pressure system and the low-pressure
system act together to create a pressure differential across the liquid in the
hollow body 336 by the high-pressure (essentially atmospheric) air pushing
the liquid in the hollow body 336 up through the inlet tubes 310, 318 and
into the priming chamber 374, displacing the low-pressure air and priming
the pump 372.
The primed pump 372 will then pump the collected liquid out of the
tank 32. The liquid collected in the tank 32 will flow from the tank 32
through the filter 358 into the hollow body 336, up the inlet tubes 310,
318, into the priming chamber 374 and up to the pump impeller 104.
Some of this liquid will splash through the gap 140, but the majority of this
liquid will flow downward into the discharge recess 376, past the check
valve 364, and into the outlet section 256. The O-ring 324 will prevent
any liquid from leaking between the interface of the outer annular wall 320
of the pump fitting 308 and the outer annular wall 136 of the lower
impeller housing 126. Once in the outlet section 256, the liquid will flow
CA 02219682 1997-10-28
-24-
through the pump connector 334, the tube 360, the rotatable connector 362,
the passageway 284, the passageway 280, and out the pump outlet 56
through the hose 302, if connected, to a drainage source (not depicted).
Once primed, the user can turn the knob 274 so that the dog 276c is
C/ 5 aligned with the pump outlet 56, thus putting the passageway 280 in
alignment with the passageway 284 to permit the liquid to discharge at a
maximum flow rate (Fig. 12C). This self priming action of the present
invention is a unique aspect of this design.
If for some reason the pump 372 will not self prime (e. g. , the check
valve 364 is not sealing tightly), the user may prime the pump 372 by
rotating the knob 274 to its 45° position so that dog 276b aligns with
the
pump outlet 56 (Fig. 12B). The relatively high-pressure outside air, at
atmospheric pressure, will enter the inlet 266 (Figs. 10 and 11) and fill the
passageway 284, the flexible tube 360, and the conduit 314, creating a
high-pressure system like the one described above. This high-pressure
system will create a pressure differential across the liquid in the hollow
body 336 and prime the pump 372 in the same manner as described above.
Another unique design feature of the present invention is that the
pump 372, once primed, is not likely to lose its prime due to deterioration
of the O-ring 322. When the pump 372 is pumping liquid out, the O-ring
322, which forms a seal between the upper inlet tube 318 and the inner
annular wall 134 of the lower impeller housing 126, is surrounded by
liquid on both sides because both the priming chamber 374 and the
discharge recess 376 are filled with liquid. As such, even when the O-ring
322 begins to deteriorate, air will not be able to enter the priming chamber
374 and cause the pump 372 to lose its prime. The pump 372 will,
however, operate less efficiently in this situation.
Referring to Figs. 16 and 23-25, if, while vacuuming, the level of
the liquid in the tank 32 gets too high, the mechanical shut-off and override
assembly 144 will automatically shut-off the motor 93. When the liquid in
CA 02219682 1997-10-28
- 25 -
the tank 32 gets to the level of the float 148, the liquid pushes the float
148
upward. Simultaneously, the float 148 pushes the float rod 146 upward in
the rod receiving extension 210 of the toggle 154. Eventually, the rising
liquid reaches a level high enough to create an upward force so that the
float rod 146 pushes the toggle 154 clockwise, disengaging the toggle 154
from the switch 152. Once the toggle 154 is disengaged from the switch
152, the momentary actuator 202, due to the force of the internal spring
204, springs outward turning the switch 152 "OFF" (Figs. 24A and 24B)
which stops the motor 93 and, consequently, stops the air impeller 74 and
the pump impeller 104 from rotating. The float 148 should be placed at a
height low enough so that the motor 93 is turned "OFF" before the level of
liquid is high enough to begin entering the air impeller 74. Once the motor
93 has been turned "OFF", the user has two options: the user may either
remove the upper vacuum assembly 34 and manually empty the tank 32 or
the user may bypass the float shut-off by mechanically overriding the float
shut-off.
To manually empty the tank 32, the user unfastens the latches 52
and lifts off the upper vacuum assembly 34. While lifting the upper
vacuum assembly 34, the motor 93 will not inadvertently turn "ON". The
present invention has a number of design features incorporated within it to
keep the toggle 154 from re-engaging the momentary actuator 202, which
would cause the motor 93 to turn "ON", while the upper vacuum assembly
34 is being lifted from the tank 32. First, the toggle 154 is intentionally
not connected to the float rod 146. If the toggle 154 was formed integral
with the float rod 146, the float rod 146 would cause the toggle 154 to
rotate counter-clockwise while the upper vacuum assembly 34 was being
lifted and would possibly re-engage the momentary actuator 202. Second,
the outward force of the internal spring 204 of the switch 152 is enough to
keep the toggle from inadvertently depressing the momentary actuator 202
while the upper vacuum assembly 34 is being lifted. Once the upper
CA 02219682 1997-10-28
-26-
vacuum assembly 34 is removed, the user lifts the tank 32, removes the
mesh collection bag 370, and dumps the contents of the tank 32 into a
drainage source.
Instead of dumping the contents of the tank 32, the user may
mechanically bypass the float shut-off, by pushing upward on the user
engageable actuator 62 (Figs. 25A and 25B). As discussed above, the
upward movement of the user engageable actuator 62 moves the boss 218
upward which causes the toggle 154 to rotate counter-clockwise. The
toggle 154 rotates into contact with and depresses the momentary actuator
202 again. Once the momentary actuator 202 is depressed, the motor 93
turns back "ON", and the user can continue pumping liquid out of the tank
32. However, in this situation, the user must hold the user engageable
actuator 62 upward until a sufficient amount of liquid has been pumped out
of the tank 32 so that the liquid level is below the motor shut-off level;
otherwise, the liquid will continue to push the float 148 upward which will
push the toggle 154 clockwise again, turning the motor 93 "OFF". Once
the user has pumped out enough liquid to put the liquid level in the tank 32
below the motor shut-off level, the motor 93 will stay "ON" when the user
releases the user engageable actuator 62, and the user may resume normal
operation of the vacuum cleaner 30.
When the user is finished either vacuuming or pumping with the
vacuum cleaner 30, the user turns the vacuum cleaner 30 "OFF" by
pushing downward on the user engageable actuator 62 (Figs. 22A and
22B). The downward force is transmitted to the spring member 158 and to
the link 156. The downward force on the spring member 158 presses the
lower spring 238 against the bottom lip 246 of the slot 242, creating a
load. The downward force on the link 156 moves the boss slot 226
downward. As the boss slot 226 moves downward, the boss slot 226
engages the boss 218 of the toggle 154. Continued downward movement
of the boss slot 226 moves the boss 218 downward and causes the toggle
CA 02219682 1997-10-28
-27-
154 to rotate clockwise around the toggle axle 190 (Fig. 6). The bottom of
the opening 194 in the switch cover 162 and the toggle stop 170 keep the
toggle 154 from traveling too far backward. The clockwise rotation of the
toggle 154 disengages the locking brace 214 from the momentary actuator
202. As such, the internal spring 204 of the switch 152 pushes the
momentary actuator 202 outward and turns the switch 152 "OFF", which in
turn shuts off the motor 93. Once the user releases the user engageable
actuator 62, the load created on the lower spring 238 is released, and the
spring member 158 re-centers the user engageable actuator 62 in the slot
242 (Figs. 19A and 19B).
The vacuum cleaner of the present invention has significant
advantages over prior vacuum cleaners. By providing a pump to remove
liquid from the tank, liquid can be emptied easily into drains at a variety of
heights. Driving the pump impeller off of the same motor which drives the
air impeller significantly reduces the cost of the vacuum cleaner over
designs which require a separate motor for the pump. By locating the
pump in the tank directly below the air impeller, the pump impeller can be
simply and efficiently driven off a single axle connected to the air impeller.
Removability of the pump adapter assembly provides significant efficiency
when the vacuum cleaner is used on dry material.
The mechanical shut-off and override assembly of the present
invention also provides significant advantages. The mechanical shut-off
and override assembly automatically shuts off the motor when the liquid
level in the vacuum cleaner tank gets too high. This assembly then allows
the user to bypass the vacuum cleaner mechanical shut-off and continue to
pump liquid out of the tank without requiring the user to lift or tilt the
tank
to empty it. Also, the priming assembly of the present invention provides
a simple, easy to use, and cost effective priming system.
CA 02219682 1997-10-28
-28-
The foregoing detailed description has been given for clearness of
understanding only, and no unnecessary limitations should be understood
therefrom, as modifications would be obvious to those skilled in the art.
~/
