Floor maintenance machine

• US 8,551,262 B2
• Filed: 10/01/2009
• Issued: 10/08/2013
• Est. Priority Date: 02/17/2006
• Status: Active Grant

• Current Assignee: Nilfisk A/S (Nilfisk Holding A/S)
• Original Assignee: Nilfisk-Advance Incorporated (Nilfisk Holding A/S)
• Inventors: Eklund, William R., Whitaker, Emert R.
• Primary Examiner(s): GOLIGHTLY, ERIC WAYNE
• Application Number:
  US12/571,515
• Publication Number:
  US 20100018990A1
• Time in Patent Office: 1,468 Days
• Field of Search: None
• US Class Current: 134/36
• CPC Class Codes: A47L 11/03 characterised by having provisions for supplying cleaning or polishing agents A47L11/065, A47L11/085, A47L11/125, A47L11/145, A47L11/161, A47L11/1625, A47L11/185, A47L11/201 take precedence
• CPC Class Codes: A47L 11/305 the tools being disc brushes
• CPC Class Codes: A47L 11/4011 Regulation of the cleaning machine by electric means; Control systems and remote control systems therefor
• CPC Class Codes: A47L 11/4083 Liquid supply reservoirs; Preparation of the agents, e.g. mixing devices

Abstract

A method of maintaining a floor comprises discharging a diluting fluid from a first reservoir to a mixing apparatus, discharging a cleaner concentrate from a second reservoir to the mixing apparatus, continuously identifying changes in fluid level within the first reservoir with a level sensor, providing a first signal indicative of an identified change in fluid level, passing the cleaner concentrate and diluting fluid through a flow control device, and processing the first signal to generate an output signal and controlling operation of the pump and the flow control device in response to the output signal to provide a flow of fluid to a cleaning device at a substantially constant ratio of the diluting fluid from the first reservoir to the cleaner concentrate from the second reservoir for substantially all fluid levels of the first reservoir.

Claims

1. A method of maintaining a floor by applying fluid thereto, said method comprising:

discharging a diluting fluid from a first reservoir to a mixing apparatus, the first reservoir being a gravity-feed reservoir;

discharging a cleaner concentrate from a second reservoir to the mixing apparatus with a selectively on pump;

mixing the discharged diluting fluid and cleaner concentrate to form a cleaning solution;

continuously identifying changes in fluid levels within the first reservoir with a level sensor;

providing a first signal indicative of an identified change in fluid level in the first reservoir;

passing the cleaner concentrate and diluting fluid through a flow control device for discharge therefrom;

and

processing the first signal to generate an output signal and controlling operation of the pump and the flow control device in response to the output signal to provide a uniform flow of fluid to a cleaning device at a substantially constant ratio of the diluting fluid from the first reservoir to the cleaner concentrate from the second reservoir for substantially all fluid levels of the first reservoir.

2. The method of claim 1, wherein the flow control device includes an on/off valve.

3. The method of claim 2, wherein the pump comprises a positive displacement pump.

4. The method of claim 3, wherein the pump pumps cleaning chemical into a conduit system on a predetermined controlled basis.

5. The method of claim 4 further comprising accumulating valve open time over a plurality of valve open cycles to effect controlled flow rates of fluids from the first and second reservoirs and activating a pump on cycle only if the valve is on.

6. The method of claim 1, wherein the flow control device includes a pump.