Floor polishing machine

• US 4,731,956 A
• Filed: 10/21/1986
• Issued: 03/22/1988
• Est. Priority Date: 10/21/1986
• Status: Expired due to Fees

• Current Assignee: Advance Machine Co. (Nilfisk Holding A/S)
• Original Assignee: Advance Machine Co. (Nilfisk Holding A/S)
• Inventors: Wood, David W.
• Primary Examiner(s): PARKER JR, ROSCOE
• Application Number:
  US06/922,084
• Time in Patent Office: 518 Days
• Field of Search: 51/170 R, 51/170 T, 51/174, 51/177, 51/273, 15/385, 15/49 R, 15/98
• US Class Current: 451/353
• CPC Class Codes: A47L 11/164 Parts or details of the brushing tools
• CPC Class Codes: A47L 11/4013 Contaminants collecting devices, i.e. hoppers, tanks or the like
• CPC Class Codes: A47L 11/4038 Disk shaped surface treating tools
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4055 for lifting the tools to a non-working position
• CPC Class Codes: A47L 11/4058 for adjusting the height of the tool
• CPC Class Codes: B24B 7/186 with disc-type tools

Abstract

A cleaning apparatus according to the teachings of the present invention disclosure is shown in its most preferred form of a floor polishing machine having a polishing member rotatably mounted to a platform. The polishing member is raised off the floor surface by lift levers and lever extensions pivotally mounted to the chassis having their first ends pivotally mounted to the platform of the polishing member and their second ends pivotally attached to a vertically reciprocal rod biased by a spring. The polishing member automatically lowers due to the suction created by the polishing member forcing the air from underneath the center of the polishing member during rotation and against the bias of the spring. The rigid polishing member is allowed to follow the floor surface due to the pivotal mounting of the platform to the ends of the lift levers and to a parallelogram assembly. To control dust and debris, a vacuum chamber is provided surrounding the polishing member, with the vacuum being created by an impeller formed on and rotating with the polishing member and within a pressurizing chamber for drawing air out of the vacuum chamber and forcing it through a filtering dust bag.

Claims

1. Machine for polishing floor surfaces comprising, in combination:

a chassis adapted to be moved along the floor;

a polishing member for rotation about a polishing axis for polishing the floor surface when the chassis is moved along the floor;

a platform for rotatably mounting the polishing member;

at least a first lift lever pivotally mounted to the chassis about a first pivot axis and having a free end pivotally mounted to the platform about a second pivot axis;

a lift arm pivotally mounted to the platform about the second pivot axis;

a parallelogram bar pivotally mounted to the chassis at a third pivot axis and having a free end pivotally mounted to the lift arm about a fourth pivot axis, with the first and third pivot axis lying along a vertical line and being spaced a distance, with the second and fourth pivot axis being spaced a distance equal to the spacing distance of the first and third pivot axis, with the first and second pivots axis being spaced a distance, with the third and fourth pivot axis being spaced a distance equal to the spacing distance between the first and second pivot axis, with the chassis, the lift lever, the lift arm, and the parallelogram bar forming a parallelogram for maintaining the lift arm in a vertical orientation;

means for pivoting the lift lever about the first pivot axis moving the polishing member between an operating position engaging the floor surface and a transport position spaced from the floor surface, with the second pivot axis allowing the platform and the polishing member to follow the floor surface when the chassis is moved along the floor regardless of the unevenness of the floor surface.

2. The floor polishing machine of claim 1 further comprising, in combination:

means for resiliently maintaining the platform at the desired angular relationship to the lift arm allowing the polishing member to be spaced from the floor surface in its transport position.

3. The floor polishing machine of claim 2 wherein the resiliently maintaining means comprises, in combination:

a lift arm extension contiguous with the lift arm and extending beyond the fourth pivot axis in a direction opposite to the second pivot axis, with the platform having a front edge and a rear edge;

a first spring extending between the front edge of the platform and the lift arm extension; and

a second spring extending between the rear edge of the platform and the lift arm extension.

4. The floor polishing machine of claim 1 wherein the lift lever pivoting means comprises, in combination:

means for biasing the lift lever to pivot about the first pivot axis for elevating the second pivot axis and for raising the polishing member off the floor surface when the polishing member is not rotating, and with the rotation of the polishing member forcing air from beneath the rotating polishing member creating a vacuum under the polishing member to place a downward suction on the polishing member and the platform to which it is rotatably mounted and counteracting with the biasing means to place an even force on the floor surface by the polishing member regardless of the unevenness of the floor surface.

5. The floor polishing machine of claim 4 wherein the lift lever biasing means comprises, in combination:

a lever extension contiguous with the first lift lever and extending beyond the first pivot axis in a direction opposite to the second pivot axis and having a free end; and

means for biasing the free end of the lever extension.

6. The floor polishing machine of claim 5 further comprising, in combination:

means for varying the bias of the lever extension biasing means.

7. The floor polishing machine of claim 6 wherein the lever extension biasing means comprises, in combination:

a lift rod reciprocally, vertically mounted in the chassis, with the first end of the lift rod being pivotally connected to the free end of the lever extension; and

means for biasing the lift rod.

8. The floor polishing machine of claim 7 wherein the bias varying means comprises, in combination:

an adjustment lever pivotally mounted to the chassis between its first and second ends, with the biasing means engaging the first end of the adjustment lever; and

means for holding the second end of the adjustment lever in one of a plurality of pivotal positions.

9. The floor polishing machine of claim 5 further comprising, in combination:

a second lift lever pivotally mounted to the chassis about the first pivot axis and having a free end pivotally mounted to the platform about the second pivot axis;

a second lever extension contiguous with the second lift lever and extending beyond the first pivot axis in a direction opposite to the second pivot axis and having a free end;

a connecting member secured to the free end of the first lever extension and extending in a direction towards the free end of the second lever extension;

an adjustment arm extending from the connecting member generally parallel to the second lever extension and having a free end pivotally mounted to the chassis about the first pivot axis; and

means for adjusting the angular orientation of the second lever extension and the adjustment arm about the first pivot axis allowing the free end of the second lift lever to be raised or lowered such that the engagement of the polishing member with the floor can be varied to allow the polishing member to propel the chassis along the floor.

10. The floor polishing machine of claim 1 further comprising, in combination:

a device for controlling and collecting dust from the polishing member, with the polishing member having a perimeter, with the dust controlling and collecting device comprising, in combination;

a vacuum chamber located concentrically around the perimeter of the polishing member;

means for receipt of dust ladened air and for filtering the dust therefrom;

a pressurizing chamber having an inlet in air communication with the vacuum chamber and an exhaust in air communication with the dust receipt and filtering means; and

means located in the pressurizing chamber for drawing air through the inlet and forcing the air through the exhaust with the dust produced by the rotating polishing member moving outwardly to the perimeter of the polishing member due to its rotation and drawn with the air through the vacuum chamber and the pressurizing chamber for collection in the dust receipt and filtering means.

11. The floor polishing machine of claim 10 further comprising, in combination:

a shield for the polishing member, with the shield including a planar portion and a downwardly extending flange, with the pressurizing chamber including a downwardly extending flange of a size generally equal to but slightly larger than the polishing member, with the flange of the shield having a shape for receipt around the flange of the pressurizing chamber, with the vacuum chamber being defined by and between the shield and the pressurizing chamber.

12. Machine for polishing floor surfaces comprising, in combination:

a chassis adapted to be moved along the floor;

a polishing member for rotation about a polishing axis for polishing the floor surface when the chassis is moved along the floor;

a platform for rotatably mounting the polishing member;

at least a first lift lever pivotally mounted to the chassis about a first pivot axis and having a free end attached to the platform;

a lever extension contiguous with the first lift lever and extending beyond the first pivot axis in a direction opposite to the free end of the first lift lever, with the lever extension having a free end; and

means for biasing the free end of the lever extension for raising the polishing member off the floor surface when the polishing member is not rotating, with the rotation of the polishing member forcing air from beneath the rotating polishing member creating a vacuum under the polishing member to place a downward suction on the polishing member and the platform to which it is rotatably mounted and counteracting with the biasing means to place an even force on the floor surface by the polishing member regardless of the unevenness of the floor surface.

13. The floor polishing machine of claim 12 wherein the lever extension biasing means comprises, in combination:

a lift rod reciprocally, vertically mounted in the chassis, with the first end of the lift rod being pivotally connected to the free end of the lever extension; and

means for biasing the lift rod.

14. The floor polishing machine of claim 13 further comprising, in combination:

means for varying the bias of the lift rod biasing means.

15. The floor polishing machine of claim 14 wherein the bias varying means comprises, in combination:

an adjustment lever pivotally mounted to the chassis between its first and second ends, with the biasing means engaging the first end of the adjustment lever; and

means for holding the second end of the adjustment lever in one of a plurality of pivotal positions.

16. The floor polishing machine of claim 12 further comprising, in combination:

a second lift lever pivotally mounted to the chassis about the first pivot axis and having a free end attached to the platform;

a second lever extension contiguous with the second lift lever and extending beyond the first pivot axis in a direction opposite to the free end of the second lift lever, with the second lever extension having a free end;

a connecting member secured to the free end of the first lever extension and extending in a direction towards the free end of the second lever extension;

an adjustment arm extending from the connecting member generally parallel to the second lever extension and having a free end pivotally mounted to the chassis about the first pivot axis; and

means for adjusting the angular orientation of the second lever extension and the adjustment arm about the first pivot axis allowing the free end of the second lift lever to be raised or lowered such that the engagement of the polishing member with the floor can be varied to allow the polishing member to propel the chassis along the floor.

17. The floor polishing machine of claim 12 further comprising, in combination:

a device for controlling and collecting dust from the polishing member, with the polishing member having a perimeter, with the dust controlling and collecting device comprising, in combination;

a vacuum chamber located concentrically around the perimeter of the polishing member;

means for receipt of dust ladened air and for filtering the dust therefrom;

a pressurizing chamber having an inlet in air communication with the vacuum chamber and an exhaust in air communication with the dust receipt and filtering means; and

means located in the pressurizing chamber for drawing air through the inlet and forcing the air through the exhaust with the dust produced by the rotating polishing member moving outwardly to the perimeter of the polishing member due to its rotation and drawn with the air through the vacuum chamber and the pressurizing chamber for collection in the dust receipt and filtering means.

18. The floor polishing machine of claim 17 further comprising, in combination:

a shield for the polishing member, with the shield including a planar portion and a downwardly extending flange, with the pressurizing chamber including a downwardly extending flange of a size generally equal to but slightly larger than the polishing member, with the flange of the shield having a shape for receipt around the flange of the pressurizing chamber, with the vacuum chamber being defined by and between the shield and the pressurizing chamber.

19. In a machine including a rotating working member which produces dust, with the rotating working member having a top and a perimeter, a device for controlling and collecting dust comprising, in combination:

a vacuum chamber located concentrically around the perimeter of the rotating working member;

means for receipt of dust ladened air and for filtering the dust therefrom;

a pressurizing chamber having an inlet in air communication with the vacuum chamber and an exhaust in air communication with the dust receipt and filtering means; and

means located in the pressurizing chamber for drawing air through the inlet and forcing the air through the exhaust with the dust produced by the rotating working member moving outwardly to the perimeter of the working member due to its rotation and drawn with the air through the vacuum chamber and the pressurizing chamber for collection in the dust receipt and filtering means.

20. The device of claim 19 wherein the air drawing and forcing means comprises an impeller located in the pressurizing chamber and on top of the rotating working member for rotation therewith.

21. The device of claim 19 wherein the pressurizing chamber comprises, in combination:

an air barrier located above the top of the rotating working member; and

a centrifugal housing including a spiral diffuser upstanding from an annular portion, with the annular portion of the centrifugal housing being secured to the air barrier.

22. The device of claim 21 further comprising, in combination:

a shield for the rotating working member, with the shield including a planar portion and a downwardly extending flange, with the pressurizing chamber including a downwardly extending flange of a size generally equal to but slightly larger than the rotating working member, with the flange of the shield having a shape for receipt around the flange of the pressurizing chamber, with the vacuum chamber being defined by and between the shield and the pressurizing chamber.

23. The device of claim 22 further comprising, in combination:

a first flexible skirt dependingly mounted to the flange of the pressurizing chamber, with the first skirt being formed of air impervious material for preventing dust from being blown away by the rotating work member.

24. The device of claim 23 further comprising, in combination:

a second flexible skirt dependingly mounted to the flange of the shield, with the second skirt being formed of filtering-type material allowing air to pass therethrough but being impervious to dust.