Floor preparation machine and method

• US 4,768,311 A
• Filed: 03/20/1987
• Issued: 09/06/1988
• Est. Priority Date: 03/20/1987
• Status: Expired due to Term

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Olson, Donald L.
• Primary Examiner(s): PARKER JR, ROSCOE
• Application Number:
  US07/028,660
• Time in Patent Office: 536 Days
• Field of Search: 51/174, 51/176, 51/281 R, 51/317, 51/328, 51/170 R, 51/170 EB, 125/11 CD
• US Class Current: 451/59
• CPC Class Codes: A47L 11/00 Machines for cleaning floors, carpets, furniture, walls, or wall coverings
• CPC Class Codes: A47L 11/4013 Contaminants collecting devices, i.e. hoppers, tanks or the like
• CPC Class Codes: A47L 11/4047 Wound-up or endless cleaning belts
• CPC Class Codes: A47L 11/4058 for adjusting the height of the tool
• CPC Class Codes: A47L 11/408 Means for supplying cleaning or surface treating agents
• CPC Class Codes: B24B 21/04 for grinding plane surfaces
• CPC Class Codes: B24B 7/188 with cylinder- or belt-type tools
• CPC Class Codes: E04G 23/006 Arrangements for removing of previously fixed floor coverings

Abstract

A machine and method for removing coatings and/or membranes from the surface of a floor or the like, which may be uneven, and also conditioning a floor so that it more readily acccepts a new coating. The machine takes the form of a driver member or element which may be abrasive or which may apply or work free abrasive particles against a floor with a controlled application rate that may be related to floor conditions and travel speed of the machine over the surface.

Claims

1. A method of removing unwanted material, such as a coating, membrane, soilage or the like, from a surface, including the steps of moving a flexible driver through a predetermined path under down force against the surface being worked upon thereby creating a working zone, supplying free abrasive particles to the working zone between the driver and the surface and in a direction so that the particles will tend to be moved by the driver through the working zone, allowing the particles to be moved by the driver through the working zone in contact with the surface, continuing the down force on the driver and abrasive particles while they are in the working zone to cause them to remove unwanted material from the surface, and moving the driver over the surface at a rate of travel less than the relative motion between the exterior of the driver and a point on the surface being worked upon while continuing the supply of free abrasive particles between the driver and the working zone.

2. The method of claim 1 further including the step of causing the driver to flexibly conform itself to irregularities in the surface.

3. The method of claim 1 further characterized by and including the step of allowing the driver to tilt about an axis generally parallel to its direction of movement in the working zone to enable it to conform to irregularities in the surface.

4. The method of claim 1 further characterized by and including the step of providing a plurality of preformed exposed pockets on the exterior of the flexible driver to be moved through the working zone with the driver, and allowing the free abrasive particles to be received in and moved by the pockets through the working zone.

5. A method of removing unwanted material, such as a coating, membrane, soilage or the like, from an irregular surface, including the steps of moving a flexible driver through a predetermined path against the surface being worked upon thereby creating a working zone, applying a predetermined down force against the driver as it moves through the working zone, creating an abrasive medium in the working zone between the driver and the surface, continuing the predetermined down force on the driver and abrasive medium in the working zone to cause them to remove unwanted material from the surface, maintaining the down force on the driver against the surface approximately constant as the driver encounters irregularities in the surface, providing a free abrasive medium, and moving the free abrasive medium between the driver and the surface.

6. The method of claim 5 further including the step of causing the driver to flexibly conform itself to irregularities in the surface.

7. The method of claim 5 further characterized by and including the step of allowing the driver to tilt about an axis generally parallel to its direction of movement in the working zone to enable it to conform to irregularities in the surface.

8. The method of claim 5 further characterized and including the step of providing a plurality of exposed pockets on the exterior of the flexible driver to be moved through the working zone with the driver, and allowing the free abrasive particles to be received in and moved by the pockets through the working zone.

9. The method of claim 8 further including the step of moving the driver over the surface at a rate of travel less than the relative motion between the exterior of the driver and a point on the surface being worked upon while continuing the supply of free abrasive particles between the driver and the working zone.

10. In a machine for removing unwanted material, such as a coating from a surface, a mobile frame, a generally cylindrical work wheel on the frame disposed for rotation about a generally horizontal axis, a second wheel on the frame in spaced relation to the work wheel and above the surface being worked upon, a flexible belt around the work wheel and second wheel and means for tensioning the belt, means for biasing the work wheel and the portion of the belt under it against the surface being worked upon, means allowing the work wheel to tilt about an axis generally parallel to the direction of movement of the machine so that the work wheel and the belt under it will automatically conform to irregularities in the surface being worked upon, and a tracking mechanism on the frame for detecting lateral movement of the belt and for automatically centering the belt on the work wheel.

11. The structure of claim 10 further characterized in that the tracking mechanism includes a belt edge sensing device.

12. The structure of claim 10 further characterized in that the tracking mechanism includes means for adjusting the second wheel about a generally vertical axis to compensate for lateral movement of the belt on the work wheel.

13. The structure of claim 10 further characterized in that the second wheel is closely adjacent but out of contact with the surface being worked upon.

14. The structure of claim 10 further characterized in that the means for tensioning the belt is constructed and arranged to separate the wheels.

15. The structure of claim 10 further characterized by and including a source of free abrasive particles on the frame, and means for propelling the free abrasive particles onto the surface under the work wheel and belt.

16. The structure of claim 10 further characterized in that the work wheel has a compressible exterior with the general characteristics of rubber as to flexibility and distortability so as to provide compressibility to the exterior of the work wheel as it and the belt are biased against the surface.

17. The structure of claim 10 further characterized by and including means allowing the work wheel to tilt so that it automatically conforms to irregularities in the surface being worked upon.

18. The structure of claim 10 further characterized in that the outer surface of the belt is coated with abrasive particles.

19. In a machine for removing unwanted material, such as a coating from a surface, a mobile frame and means for propelling it, a generally cylindrical work wheel on the frame disposed for rotation about a generally horizontal axis, power means for rotating the work wheel, means for biasing the work wheel toward the surface, a source of free abrasive on the frame, and means for supplying free abrasive between the work wheel and the surface being worked upon to remove a coating from the surface.

20. The structure of claim 19 further characterized by and including a flexible belt disposed about the work wheel and a roller which is in spaced relationship to the work wheel to maintain the belt in tension, the abrasive supplying means being disposed to supply free abrasive between the exterior of the belt and the surface being worked upon in a direction so that the free abrasive will be drawn between the flexible belt and the surface being worked upon.

21. The structure of claim 19 further characterized in that the means for supplying free abrasive includes power means for propelling the free abrasive between the bottom of the work wheel and the surface being worked upon.

22. The structure of claim 19 further characterized by and including a compressible exterior on the work wheel having the general characteristics of rubber as to flexibility and distortability to provide compressibility to the exterior of the work wheel so that it will conform to irregularities in the surface, and a pattern of herringbone shaped relief areas in the compressible exterior.

23. The structure of claim 19 further characterized by and including means for rotating the work wheel in a direction bottom side to the rear relative to the direction of travel of the machine and at a peripheral rate of travel greater than the speed of travel of the machine.

24. The structure of claim 19 further characterized by and including a flexible abrasive belt around the work wheel and between it and the surface being worked upon, and means on the frame for tensioning the belt.

25. The structure of claim 19 further characterized in that the work wheel is surrounded by an abrasive sleeve.

26. The structure of claim 19 further characterized by a compressible exterior on the work wheel having the general characteristics of rubber as to flexibility and distortability to provide compressibility to the exterior of the work wheel so that it will conform to irregularities in the surface.

27. The structure of claim 26 further characterized by and including a pattern of relief areas on the exterior of the work wheel to provide increased distortability.

28. The structure of claim 26 further characterized in that the compressible exterior is in the form of a rubber-like sleeve mounted on a structural core.

29. In a machine for removing unwanted material, such as a coating from a surface, a mobile frame and means for propelling it, a generally cylindrical work wheel on the frame disposed for rotation about a generally horizontal axis with its periphery adjacent the surface, power means for rotating the wheel, a flexible exterior on the work wheel having the general characteristics of rubber as to flexibility and distortability, a pattern of relief areas for the compressible exterior to provide increased distortability where the work wheel is in contact with the surface, and an abrasive medium between the work wheel and the surface being worked upon.

30. The structure of claim 29 further characterized in that the pattern of relief areas includes a plurality of grooves.

31. The structure of claim 30 further characterized in that the grooves are in the form of a herringbone.

32. The structure of claim 29 further characterized in that the compressible exterior on the work wheel is in the form of a rubberlike sleeve mounted on a structural core.

33. The structure of claim 29 further characterized in that the abrasive medium includes a flexible abrasive exterior around at least a part of the work wheel.

34. The structure of claim 29 further characterized in that the abrasive medium includes a flexible abrasive belt.

35. The structure of claim 29 further characterized in that the abrasive medium includes a flexible abrasive sleeve around the work wheel.

36. In a device for removing unwanted material, such as a coating from a surface, a mobile frame and power means for propelling it, a generally cylindrical work wheel on the frame disposed for rotation about a generally horizontal axis with its periphery adjacent the surface, a second wheel on the frame in spaced relation to the work wheel, a flexible belt around the work wheel and second wheel and means for tensioning the belt between them, means for biasing the work wheel and belt against the surface being worked upon, the belt being somewhat wider than the work wheel so that a straight cut will be taken on the surface even if the belt moves somewhat laterally on the work wheel, power means for driving at least one of the wheels, a trackig mechanism for sensing lateral movement of the belt, and means responsive to the tracking mechanism for adjusting the second wheel so that the belt will be maintained generally centered on the work wheel.

37. The structure of claim 36 further characterized in that the power means drives the work wheel.

38. The structure of claim 36 further characterized in that the belt is a flexible abrasive belt.

39. The structure of claim 36 further characterized in that the work wheel has a compressible exterior having the general characteristics of rubber as to flexibility and distortability, and a pattern of relief areas in the compressible exterior to provide for increased distortability.

40. In a machine for removing unwanted material, such as a coating from a surface, a mobile frame and means for propelling it, a generally cylindrical work wheel on the frame disposed for rotation about a generally horizontal axis with its periphery adjacent to the work surface, power means for rotating the work wheel, an abrasive medium between the bottom of the work wheel and the surface being worked upon, and means for applying and maintaining a generally constant down force by the work wheel and abrasive medium on the surface being worked upon as the work wheel follows changes in the contours of the surface, the abrasive medium including a free abrasive supplied between the work wheel and the surface being worked upon.

41. The structure of claim 40 further characterized in that the abrasive medium includes a flexible abrasive belt.

42. The structure of claim 40 further characterized in that the abrasive medium includes an abrasive cylinder around the work wheel.

43. The structure of claim 40 further characterized by and including means for mounting the work wheel so that it may tilt relative to the frame about an axis generally parallel to its direction of movement in the working zone to enable it to conform to irregularities in the surface being worked upon.

44. The structure of claim 40 further characterized in that the means for applying and maintaining a generally constant down force is hydraulic.

45. The structure of claim 40 further characterized in that the means for applying and maintaining a generally constant down force is pneumatic.

46. The structure of claim 40 further characterized in that the means for applying and maintaining a generally constant down force is electrical.

47. In a machine for removing unwanted material, such as a coating, membrane, soilage or the like, from a surface, a generally cylindrical work wheel adapted to be disposed for rotation about a generally horizontal axis with its periphery adjacent the surface, a compressible exterior on the work wheel having the general characteristics of rubber as to flexibility and distortability, and an abrasive medium between the work wheel and the surface being worked upon, each end of the compressible exterior being slightly chamfered so that adjacent cuts on the surface being worked upon will be feathered together and will blend.

48. The structure of claim 47 further characterized by and including a pattern of relief areas for the exterior of the work wheel to provide for increased distortability.

49. The structure of claim 47 further characterized in that the abrasive medium is at least in part a belt that is disposed about the work wheel and around a second wheel in spaced relation to the work wheel.

50. The structure of claim 47 further characterized in that the compressible exterior on the work wheel is in the form of a rubberlike sleeve mounted on a structural core.

51. The structure of claim 50 further characterized by and including a series of grooves in the rubberlike sleeve of the work wheel in a herringbone pattern.

52. The structure of claim 47 further characterized by and including a second wheel in spaced relation to the work wheel, a flexible belt around both wheels, and power means for driving the work wheel.

53. The structure of claim 47 further characterized by and including a second wheel in spaced relation to the work wheel, a flexible belt around both wheels, and power means for driving the second wheel so that the work wheel will be driven by the belt.

54. In a machine for removing unwanted material, such as a coating from a surface, a mobile frame with a defined direction of travel, a generally cylindrical work wheel on the frame disposed for rotation about a generally horizontal axis transverse to the direction of travel with the periphery of the wheel adjacent to the surface, power means for propelling the machine and rotating the work wheel, an abrasive medium between the periphery of the wheel and the surface for removing a coating therefrom, and a pivotal mounting so that the wheel may pivot about an axis generally parallel to the direction of travel to permit the periphery of the wheel to conform to irregularities in the surface.

55. The structure of claim 54 further characterized in that the abrasive medium includes an endless flat belt having its outer surface coated with abrasive particles.

56. The structure of claim 54 further characterized in that the abrasive medium includes a source of free abrasive particles on the frame, and means for propelling the free abrasive particles under and in front of the work wheel.

57. The structure of claim 54 further characterized in that the abrasive medium includes an abrasive sleeve mounted on the work wheel.

58. The structure of claim 54 further characterized in that the work wheel has a compressible exterior.