Vacuum dumping arrangement for a wet/dry vacuum cleaner

• US 4,179,768 A
• Filed: 08/21/1978
• Issued: 12/25/1979
• Est. Priority Date: 03/16/1977
• Status: Expired due to Term

• Current Assignee: Aktiebolaget Electrolux
• Original Assignee: Aktiebolaget Electrolux
• Inventors: Sawyer, Roderick
• Primary Examiner(s): Moore, Christopher K.
• Application Number:
  US05/935,367
• Time in Patent Office: 491 Days
• Field of Search: 15/327 C, 15/320, 15/321, 15/352, 15/353, 55/216-218, 137/625.44, 137/874
• US Class Current: 15/352
• CPC Class Codes: A47L 7/0019 Details of the casing
• CPC Class Codes: A47L 7/0028 Security means, e.g. float valves or level switches for preventing overflow
• CPC Class Codes: A47L 7/0038 with means for emptying the tanks
• CPC Class Codes: A47L 7/0042 Gaskets; Sealing means

Abstract

A dumping system for a wet/dry tank type vacuum cleaner which functions to empty the liquid solution together with the dirt and debris accumulated in the tank. The dumping system is controlled by the operator who can selectively regulate the air flow and thereby control the dumping action of the system. The dirty liquid solution is pumped out of the intake hose of the vacuum cleaner.

Claims

1. A wet/dry vacuum cleaner having a suction mode and a fluid pressurizing mode resulting in air and liquid discharge respectively comprising:

a tank provided with an aperture and having an intake hose, a cover for said tank, one end of said hose being connected to said aperture for communication with the interior of said tank, a fan-motor, a separate enclosure for said fan-motor, said enclosure being provided with two spaced openings each of which are fluidly connected to one of the suction or pressure sides of said fan, one of said openings connecting the space between said cover and the enclosure of said fan-motor with the suction side of said fan, a flexible tube communicating said tank with either one of said openings, shifting means for one end of said tube from a connection to one of said openings to a connection to the other of said openings, said flexible tube being continually connected to at least one of said openings, the suction side of said fan having a suction level that can be controlled by misaligning the end of said flexible tube and suction opening to permit air from the space between the cover and enclosure to be bled into said fan, the pressure side of said fan being controlled by misaligning the end of said flexible tube and the discharge opening for controlling the discharge rate of the liquid discharge, said cover spaced from and surrounding said fan-motor enclosure, the latter having said internal space for said fan-motor, said cover also enclosing said shifting means and said flexible tube, vent means in said cover for permitting fluid communication between the atmosphere and said space;

the suction mode having air which passes through said flexible tube, through the opening on the suction side of said fan, and through said vent means to the atmosphere;

a liquid evacuating means connected to said intake hose, said liquid evacuating means having a pipe provided with one end connected to said intake hose and the other end being free and arranged to be submerged in the liquid solution accumulated in said tank and closely adjacent to the bottom of said tank, a one-way valve in said tank communicating with said intake hose;

the fluid pressurizing mode having said flexible tube communicating with the other of said openings whereby air in the space between the cover and enclosure enters the suction side of the fan and passes through the pressure side of said fan, said flexible tube, and to said tank to close said one-way valve thus causing said air in the tank to be pressurized to an extent to pump the liquid solution in said tank out of said pipe and intake hose while said one-way valve is maintained in the closed condition.

2. A wet/dry vacuum cleaner as claimed in claim 1 wherein said means for shifting said flexible tube from one opening to the other opening is a slidable plate mounting said one end of said tube and having an aperture aligned with the opening of said tube, said plate aperture being slidable between positions in alignment with either of said openings.

3. A wet/dry vacuum cleaner as claimed in claim 2 wherein said shifting means includes a control rod connected to said slidable plate, the free end of said control rod extending externally of the vacuum cleaner cover and adapted to be operated manually.

4. A wet/dry vacuum cleaner as claimed in claim 3 wherein said slidable plate and control rod operate in a vertical plane whereby said control rod projects above the top of said cover.

5. A wet/dry vacuum cleaner as claimed in claim 1 wherein said one-way valve is a flexible flapper valve whereby the suction present in the tank will maintain the flapper valve in an open condition permitting dirt, debris and liquid to be drawn into said tube.

6. A wet/dry vacuum cleaner as claimed in claim 1 further comprising a sump in the bottom of said tank, said pipe being vertically disposed and communicating with said intake hose at one end thereof and extending into said sump at the other end thereof whereby when said one-way valve is closed and said vacuum cleaner is in the pressurized mode the liquid solution is substantially completely evacuated from said tank.

7. A wet/dry vacuum cleaner as claimed in claim 1 further comprising an automatic float type shut-off means in the tank which eliminates the vacuum cleaner suction when the liquid level in the tank rises to a predetermined level.