Orbital scrubber with stabilizer element

• US 8,234,749 B2
• Filed: 10/29/2007
• Issued: 08/07/2012
• Est. Priority Date: 01/11/2005
• Status: Expired due to Fees

• Current Assignee: Nilfisk A/S (Nilfisk Holding A/S)
• Original Assignee: Nilfisk-Advance Incorporated (Nilfisk Holding A/S)
• Inventors: Mitchell, Kevin Blaine, Whitaker, Emert R., Keazer, James J.
• Primary Examiner(s): Muller, Bryan R
• Application Number:
  US11/927,529
• Publication Number:
  US 20080078041A1
• Time in Patent Office: 1,744 Days
• Field of Search: 153/20, 153/401, 153/403, 153/404, 153/55, 153/71
• US Class Current: 15/340.3
• CPC Class Codes: A47L 11/305 the tools being disc brushes
• CPC Class Codes: A47L 11/4036 Parts or details of the surface treating tools
• CPC Class Codes: A47L 11/4069 Driving or transmission means for the cleaning tools

Abstract

Vibration dampening elements that are made of rubber and/or an elastomer may fail when subjected to vertical and/or horizontal stresses caused by repeated lifting of the cleaning head assembly and/or unintentional bumping of the cleaning head assembly into door frames, walls or other non-movable objects. The present invention includes, among other things, at least one stabilizer element and preferably two stabilizer elements to reduce damage to certain vibration dampening elements caused by vertical and/or horizontal stress. Alternative embodiments of the stabilizer element are also disclosed.

Claims

1. A floor scrubber to clean hard floor surfaces comprising:

a solution tank to hold a cleaning solution;

a squeegee to pick up a dirty fluid which is held in a recovery tank; and

a cleaning head assembly comprising;

a pair of opposing lift brackets to raise and lower the cleaning head assembly;

a motor mounted on a motor mounting plate, the motor operatively connected to an eccentric cam;

a cleaning element removably connected to a flexible pad driver, the motor and eccentric cam imparting orbital movement to the flexible pad driver and the cleaning element; and

at least one elongate stabilizer element positioned so as to limit the amount of vertical movement between at least one of the lift brackets and the motor mounting plate, which limits the elongation stresses on a plurality of upper vibration dampening elements coupled between the at least one of the lift brackets and the motor mounting plate;

wherein the at least one elongate stabilizer element and the upper vibration dampening elements are mounted to the at least one of the lift brackets at distinct, spaced-apart locations.

2. The apparatus of claim 1 wherein the at least one elongate stabilizer element has one end secured to one of the pair of opposing lift brackets and a free end extending through an aperture in the motor mounting plate.

3. A floor scrubber to clean hard floor surfaces comprising:

a solution tank to hold a cleaning solution;

a squeegee to pick up a dirty fluid which is held in a recovery tank; and

a cleaning head assembly having;

a motor mounted on a motor mounting, the motor operatively connected to an eccentric cam;

a pair of opposing lift brackets each connected to the motor mounting plate by a plurality of upper vibration dampening elements;

a cleaning element removably connected to a flexible pad driver, the motor and eccentric cam imparting orbital movement to the flexible pad driver and the cleaning element; and

an elongate stabilizer element positioned between each of the lift brackets and the motor mounting plate, the elongate stabilizer element and the upper vibration dampening elements being mounted to the lift bracket at distinct, spaced-apart locations;

wherein the elongate stabilizer element limits the amount of horizontal movement between the lift bracket and the motor mounting plate, which limits stress on the upper vibration dampening elements.

4. The apparatus of claim 3 wherein each of the elongate stabilizer elements has one end secured to one of the opposing lift brackets and a free end extending through an aperture in the motor mounting plate.

5. A cleaning head assembly for use with a floor scrubber to clean hard floor surfaces, the floor scrubber having a solution tank to hold a cleaning solution, a squeegee to pick up a dirty fluid which is held in a recovery tank, the cleaning head assembly comprising:

a motor mounted on a motor mounting plate, the motor operatively connected to an eccentric cam;

a pair of opposing lift brackets to raise and lower the cleaning head assembly;

at least one upper vibration dampening element coupled between each of the lift brackets and the motor mounting plate;

a cleaning element removably connected to a flexible pad driver, the motor and eccentric cam imparting orbital movement to the flexible pad driver and the cleaning element; and

at least one elongate stabilizer element having one end coupled to one of the pair of opposing lift brackets and a free end extending through an aperture in the motor mounting plate to limit the amount of vertical and horizontal movement between the lift bracket and the motor mounting plate;

wherein the at least one elongate stabilizer element and the at least one upper vibration dampening element are mounted to the lift bracket at distinct, spaced-apart locations.

6. The apparatus of claim 5, wherein, the free end of the stabilizer element is larger in size than the aperture to allow the free end to engage the motor mounting plate when the lift bracket raises the cleaning element off the floor.

7. The apparatus of claim 5 wherein, the free end of the stabilizer element is generally t-shaped and larger than the aperture.

8. The apparatus of claim 5 wherein, the free end of the stabilizer element is larger in outside diameter than the inside diameter of the aperture to allow the free end to engage the motor mounting plate when the lift bracket raises the cleaning element off the floor, to limit the amount of vertical stretch in a plurality of upper vibration dampening elements.

9. The cleaning head assembly of claim 5 further including:

an adjustable actuator to impart a variable amount of load on the flexible pad driver and the removable cleaning element.

10. The cleaning head assembly of claim 5 wherein the flexible pad driver is formed from plastic.

11. The cleaning head assembly of claim 5 further including tool free attaching means to attach the removable cleaning element to the flexible pad driver.

12. A cleaning head assembly for use with a floor scrubber to clean hard floor surfaces, the floor scrubber having, a solution tank to hold a cleaning solution, a squeegee to pick up a dirty fluid which is held in a recovery tank, the cleaning head assembly comprising:

a motor mounted on a motor mounting plate, the motor operatively connected to an eccentric cam;

a pair of opposing lift brackets to raise and lower the cleaning head assembly;

a cleaning element removably connected to a flexible pad driver, the motor and eccentric cam imparting orbital movement to the flexible pad driver and the cleaning element;

a plurality of upper vibration dampening elements connecting the lift brackets to the motor mounting plate; and

a pair of elongate stabilizer elements each having one end secured to one of the pair of opposing lift brackets, and each having a free end extending through an aperture in the motor mounting plate to limit the amount of vertical movement between the lift bracket and the motor mounting plate which limits elongation stress on the upper vibration dampening elements;

wherein the elongate stabilizer elements and the upper vibration dampening elements are mounted to the lift brackets at distinct, spaced-apart locations.