EP1006855B1 - Self-evacuating vacuum cleaner - Google Patents

Self-evacuating vacuum cleaner Download PDF

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Publication number
EP1006855B1
EP1006855B1 EP98903462A EP98903462A EP1006855B1 EP 1006855 B1 EP1006855 B1 EP 1006855B1 EP 98903462 A EP98903462 A EP 98903462A EP 98903462 A EP98903462 A EP 98903462A EP 1006855 B1 EP1006855 B1 EP 1006855B1
Authority
EP
European Patent Office
Prior art keywords
pump
tank
vacuum cleaner
opening
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98903462A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1006855A1 (en
Inventor
Robert C. Berfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shop Vac Corp
Original Assignee
Shop Vac Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/802,333 external-priority patent/US5920955A/en
Application filed by Shop Vac Corp filed Critical Shop Vac Corp
Publication of EP1006855A1 publication Critical patent/EP1006855A1/en
Application granted granted Critical
Publication of EP1006855B1 publication Critical patent/EP1006855B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
    • A47L7/0004—Suction cleaners adapted to take up liquids, e.g. wet or dry vacuum cleaners
    • A47L7/0023—Recovery tanks
    • A47L7/0028—Security means, e.g. float valves or level switches for preventing overflow
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/29—Floor-scrubbing machines characterised by means for taking-up dirty liquid
    • A47L11/30—Floor-scrubbing machines characterised by means for taking-up dirty liquid by suction
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4013—Contaminants collecting devices, i.e. hoppers, tanks or the like
    • A47L11/4016—Contaminants collecting devices, i.e. hoppers, tanks or the like specially adapted for collecting fluids
    • A47L11/4019—Fill level sensors; Security means to prevent overflow, e.g. float valves
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4013—Contaminants collecting devices, i.e. hoppers, tanks or the like
    • A47L11/4025—Means for emptying
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4027—Filtering or separating contaminants or debris
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4036—Parts or details of the surface treating tools
    • A47L11/4044—Vacuuming or pick-up tools; Squeegees
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4063—Driving means; Transmission means therefor
    • A47L11/4069—Driving or transmission means for the cleaning tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4077—Skirts or splash guards
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
    • A47L7/0004—Suction cleaners adapted to take up liquids, e.g. wet or dry vacuum cleaners
    • A47L7/0023—Recovery tanks
    • A47L7/0038—Recovery tanks with means for emptying the tanks
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
    • A47L7/0004—Suction cleaners adapted to take up liquids, e.g. wet or dry vacuum cleaners
    • A47L7/0042—Gaskets; Sealing means

Definitions

  • 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.
  • Tank-type vacuum cleaners are capable of receiving dry materials such as debris or dirt and may also be used for suctioning liquids.
  • an upper vacuum assembly which often includes a motor and an air impeller
  • 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.
  • a second solution, disclosed in US-A-5465455, 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.
  • the pump requires not only a pump impeller and hoses but also its own electric motor, power cords, and 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.
  • 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.
  • a vacuum cleaner of the present invention 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, 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 is connected to the top of the motor housing 46, and finally, the handle 50 sits atop the cover 48.
  • the user 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.
  • 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
  • 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).
  • 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).
  • 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.
  • 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 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.
  • the upper vacuum assembly 34 also includes a 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.
  • an alternative would be to use a unitary cartridge filter that would be easily replaceable.
  • the lid cage 106 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").
  • ABS acrylonitrile-butadiene styrene copolymer
  • 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 inner annular wall 134 has a top portion 133 which includes an annular sidewall 135 which defines an opening 137 that allows fluid communication between the pump impeller 104 and the interior of the inner annular wall 134.
  • a screen 139 may be disposed across the interior of the inner annular wall 134 to prevent foreign objects from passing through the opening 137 and interfering with the pump impeller 104.
  • 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 receptacle 128 of the pump impeller 104.
  • 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.
  • 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 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).
  • 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
  • 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 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).
  • the switch 152 is a standard electrical microswitch and includes an axle bore 198, a support bore 200, a 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.
  • 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.
  • 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 sidewalls 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 sidewalls 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).
  • the toggle axle 190 extends through the axle openings 216a, 216b
  • the boss 218 extends through the opening 194 in the switch cover 162 (Fig. 6).
  • 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.
  • 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 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.
  • 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.
  • the boss 218 of the toggle 154 extends through the boss slot 226 (Fig. 6).
  • 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.
  • 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.
  • 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 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).
  • 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.
  • the float rod 146 would travel in a linear up-and-down path in a contained channel or guidance slot.
  • the upper vacuum assembly 34 also encloses a first half 254 of an outlet section 256 (Fig. 16).
  • 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 a check valve seat 271.
  • a check valve 272 which prevents air or liquid from the elbow 260 or the pump outlet 56 from escaping through the inlet 266, is disposed in the check valve seat 271.
  • 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.
  • 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 (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.
  • the O-ring 292 forms a seal between the elbow 260 and the housing 258, and the housing closure 288 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.
  • the passageway 280 is at a 45° angle to the passageway 284, permitting only partial fluid flow from the elbow 260 to the pump outlet 56.
  • 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 11 each show the path air takes after entering through the inlet 266.
  • Air After entering through the inlet 266, air passes 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.
  • 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.
  • the outer annular wall 320 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.
  • 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 tube 310 and the conduit 314.
  • a top plate 352 is attached to the hollow body 336 by screws 353.
  • 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.
  • 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 flow from the pump fitting 308 into the pump connector 334, but the check valve 364 does not permit 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.
  • a clamp 368 holds the conduit 314 against the lower inlet tube 310.
  • the check valve 364 has a pointed end 365 and is forced into a seat 367 by a spring 369.
  • the interaction of the pointed end 365 of the check valve 364, the spring 369 and the seat 367 creates a positive seal between the pump fitting 308 and the pump connector 334 during the priming of a pump indicated generally at 372 whose operation is explained in detail below.
  • a stiffening tube 371 is disposed within the lower inlet tube 310 to help keep the pressure differential apparatus 312 fixed in place during operation of the vacuum cleaner 30.
  • the clamp 368 which holds the conduit 314 against the lower inlet tube 310 is removed, and instead, the conduit 314 is wrapped around the lower inlet tube 310 one or more times to keep the conduit 314 from moving freely within the tank 32. Twisting the conduit 314 around the lower inlet tube 310 instead of using the clamp 368 reduces the tension created between the conduit 314 and the lower inlet tube 310 and allows the conduit 314 to shift with respect to the lower inlet tube 310 when contracting or expanding.
  • the filter 358 is replaced by a screen 373 in this embodiment, which may be made from plastic. The screen 373 is better suited for use when vacuuming large particulate material because the screen 373 will not clog as often as the filter 358.
  • the screen 139 across the interior of the inner annular wall 134 is removed in this embodiment, and the annular sidewall 135 which defines the opening 137 is extended downward to form a restricted fluid passage 375.
  • the reduced diameter of the restricted fluid passage 375 helps prevent the user from interfering with the pump impeller 104 at rest or during operation.
  • the inlet 266 of the housing 258 no longer defines a check valve seat 271 for the check valve 272 to be disposed within. Rather, a retaining ring 377, a washer in this embodiment, is disposed in the inlet 266 to act as the check valve seat 271 for the check valve 272.
  • 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.
  • the cloth filter 118 is removed, and the pump adapter assembly 306 is installed (Figs. 16 and 26).
  • 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.
  • 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.
  • the screen 139 (Fig. 16) or the extended annular sidewall 135 (Fig. 26) is disposed between the upper inlet tube 318 and the opening 137.
  • 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.
  • the radial flange 332 seats in the opening 114.
  • 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.
  • the power of the motor 93 may also affect the size and design of many components, including the pump impeller 104.
  • the user may install a mesh collection bag 370 into the tank 32 (Fig. 16).
  • a mesh collection bag 370 may also be used in the embodiment depicted in Fig. 26.
  • 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 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.
  • the user 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 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
  • the user 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.
  • 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.
  • 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 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.
  • the momentary actuator 202 passes the critical point CP and comes in contact with the locking portion 222 of the locking brace 214.
  • 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.
  • 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 (Figs. 16 and 26).
  • 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.
  • the mesh collection bag 370 filters out any exceptionally large particulate material to reduce the possibility of clogging the pump 372.
  • 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).
  • 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 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 (Fig. 16) or screen 373 (Fig. 26) into the hollow body 336, up the inlet tubes 310, 318 (and through the stiffening tube 371 if one is in place), 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.
  • the liquid will flow 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).
  • a drainage source not depicted.
  • the user can turn the knob 274 so that the dog 276c is 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.
  • the user may enable the priming system 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.
  • 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.
  • the pump 372 will, however, operate less efficiently in this situation.
  • the mechanical shut-off and override assembly 144 will automatically shut-off the motor 93.
  • the liquid in the tank 32 gets to the level of the float 148, the liquid pushes the float 148 upward.
  • the float 148 pushes the float rod 146 upward in the rod receiving extension 210 of the toggle 154.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • the user may mechanically bypass the float shut-off, by pushing upward on the user engageable actuator 62 (Figs. 25A and 25B).
  • 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.
  • the motor 93 turns back "ON", and the user can continue pumping liquid out of the tank 32.
  • 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".
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • the priming assembly of the present invention provides a simple, easy to use, and cost effective priming system.

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Valve Device For Special Equipments (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP98903462A 1997-01-15 1998-01-14 Self-evacuating vacuum cleaner Expired - Lifetime EP1006855B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US78424897A 1997-01-15 1997-01-15
US784248 1997-01-15
US802333 1997-02-11
US08/802,333 US5920955A (en) 1996-07-12 1997-02-11 Self-evacuating vacuum cleaner
PCT/US1998/000597 WO1998031270A1 (en) 1997-01-15 1998-01-14 Self-evacuating vacuum cleaner

Publications (2)

Publication Number Publication Date
EP1006855A1 EP1006855A1 (en) 2000-06-14
EP1006855B1 true EP1006855B1 (en) 2002-05-15

Family

ID=27120254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98903462A Expired - Lifetime EP1006855B1 (en) 1997-01-15 1998-01-14 Self-evacuating vacuum cleaner

Country Status (8)

Country Link
EP (1) EP1006855B1 (pt)
CN (1) CN1130159C (pt)
AU (1) AU724121B2 (pt)
BR (1) BR9806904A (pt)
CA (1) CA2275412C (pt)
DE (1) DE69805419T2 (pt)
HK (1) HK1023709A1 (pt)
WO (1) WO1998031270A1 (pt)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6112366A (en) * 1999-01-20 2000-09-05 Shop Vac Corporation Outlet priming self-evacuation vacuum cleaner
US6119304A (en) * 1999-03-30 2000-09-19 Shop Vac Corporation Self-evacuating vacuum cleaner
DE10335531A1 (de) * 2003-07-31 2005-02-24 Hartmut Wrede Vorrichtung zum Aufsaugen von Flüssigkeiten
DE102007029258A1 (de) * 2007-06-15 2008-12-18 Alfred Kärcher Gmbh & Co. Kg Bodenreinigungsgerät
DE102014107732A1 (de) * 2014-06-02 2015-12-03 Alfred Kärcher Gmbh & Co. Kg Sauggerät für Reinigungszwecke

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179768A (en) * 1977-03-16 1979-12-25 Aktiebolaget Electrolux Vacuum dumping arrangement for a wet/dry vacuum cleaner
US4246676A (en) * 1979-08-15 1981-01-27 Alexander Hallsworth Liquid collecting vacuum container
US5287590A (en) * 1992-09-02 1994-02-22 Yonkers Robert A Wet vacuum/extractor with vacuum priming system
US5465455A (en) * 1994-05-27 1995-11-14 Allen; Harold Overload controlled wet and dry vacuum apparatus

Also Published As

Publication number Publication date
DE69805419D1 (de) 2002-06-20
AU724121B2 (en) 2000-09-14
BR9806904A (pt) 2000-05-16
EP1006855A1 (en) 2000-06-14
CA2275412A1 (en) 1998-07-23
CA2275412C (en) 2005-04-12
WO1998031270A1 (en) 1998-07-23
CN1243422A (zh) 2000-02-02
CN1130159C (zh) 2003-12-10
DE69805419T2 (de) 2003-02-13
HK1023709A1 (en) 2000-09-22
AU6022898A (en) 1998-08-07

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