Carpet extraction machine recovery tool

• US 6,591,448 B1
• Filed: 11/20/2000
• Issued: 07/15/2003
• Est. Priority Date: 11/20/2000
• Status: Expired due to Fees

• Current Assignee: Nilfisk-Advance Incorporated (Nilfisk Holding A/S)
• Original Assignee: ALTO US Incorporated (ALTO U.S.)
• Inventors: Eklund, William R., Fulghum, Trent A.
• Primary Examiner(s): Till, Terrence R.
• Application Number:
  US09/716,310
• Time in Patent Office: 967 Days
• Field of Search: 154/01, 153/71, 152/45
• US Class Current: 15/401
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees

Abstract

A recovery system for use in a floor cleaning machine of the type including a dispensing system and a recovery system. The dispensing system configured for dispensing a liquid cleaning solution onto a floor surface to facilitate the removal of dirt from the floor surface. A recovery system configured for recovering cleaning solution and dirt from the floor surface thereby leaving a cleaned floor surface. The recovery system comprises a recovery tool movable over the floor surface. The recovery tool comprises a body including an interior suction chamber in fluid communication with a source of vacuum. At least one blade is secured to the tool body and depending therefrom for engagement with the floor surface to provide fluid communication between the suction chamber and the floor surface, whereby cleaning solution and dirt are suctioned from the floor surface. The blade is substantially rigid to inhibit deformation of the blade during operation of the floor cleaning machine and is movable relative to the tool body such that the blade remains substantially in engagement with the floor surface while moving relative to the tool body to adapt to contours in the floor surface.

Claims

1. A recovery tool for use in a floor cleaning machine of the type including a dispensing system configured for dispensing a liquid cleaning solution onto a floor surface to facilitate the removal of dirt from the floor surface and a recovery system configured for recovering cleaning solution and dirt from the floor surface thereby leaving a cleaned floor surface, the recovery system including a source of vacuum and a recovery tool in fluid communication with the source of vacuum for engaging the floor surface and suctioning cleaning solution and dirt into the recovery system, said recovery tool comprising;

a recovery tool body movable over the floor surface, said tool body including an interior suction chamber in fluid communication with the source of vacuum, and at least one elongate blade assembly secured to the tool body, said blade assembly comprising a resiliently mounted blade engageable with the floor surface to provide a seal between the blade and the floor surface, so that the source of vacuum suctions cleaning solution and dirt from the floor surface, the blade being substantially rigid to inhibit deformation of the blade during operation of the floor cleaning machine and being movable relative to the tool body such that the blade remains substantially in engagement with the floor surface along the length of the blade as the recovery tool is moved over contours in the floor surface.

2. A recovery tool including a first blade assembly for use in a floor cleaning machine of the type including a dispensing system configured for dispensing a liquid cleaning solution onto a floor surface to facilitate the removal of dirt from the floor surface and a recovery system configured for recovering cleaning solution and dirt from the floor surface thereby leaving a cleaned floor surface, the recovery system including a source of vacuum and a recovery tool in fluid communication with the source of vacuum for engaging the floor surface and suctioning cleaning solution and dirt into the recovery system, said recovery tool comprising;

a recovery tool body movable over the floor surface, said tool body including an interior suction chamber in fluid communication with the source of vacuum,.and at least one elongate blade assembly secured to the tool body, said first blade assembly comprising a resiliently mounted blade engageable with the floor surface to provide a seal between the blade and the floor surface, so that the source of vacuum suctions cleaning solution and dirt from the floor surface, the blade being substantially rigid to inhibit deformation of the blade during operation of the floor cleaning machine and being movable relative to the tool body such that the blade remains substantially in engagement with the floor surface along the length of the blade as the recovery tool is moved over contours in the floor surface; and

the recovery tool further comprising a second elongate blade assembly secured to the tool body in spaced, generally parallel relationship with the first blade assembly, said second blade assembly comprising a blade engageable with the floor surface to provide a seal between the blade and the floor surface, said blade of the second blade assembly being movable relative to the tool body and relative to the blade of the first blade assembly.

3. A recovery tool as set forth in claim 2 wherein each blade assembly comprises a blade holder on the tool body and wherein each blade comprises a plurality of blade segments independently, resiliently mounted in the blade holder for floating movement of the individual segments with respect to the tool body and with respect to each other, the segments being adapted to retain positive engagement down against the floor to reduce the size of any air gaps between the floor and the blades, thereby reducing vacuum losses due to uneven flooring and increasing the amount of cleaning water and dirt extracted from the floor.

4. A recovery tool as set forth in claim 3 wherein each blade segment is urged downward in the blade holder to an extended position to promote contact of the blade segments against the floor.

5. A recovery tool as set forth in claim 4 wherein each blade assembly further comprises at least one spring for biasing the blade segments downward.

6. A recovery tool as set forth in claim 5 wherein each blade assembly comprises a plurality of coil springs, each spring being arranged generally vertically within the blade holder such that a lower end of each spring presses down against a respective blade segment to bias the blade segment downward for positive engagement with the floor.

7. A recovery tool as set forth in claim 6 wherein the lower end of each coil spring is received within an indent in an upper portion of a respective blade segment to properly orient and hold the spring in proper position within the tool.

8. A recovery tool as set forth in claim 5 wherein said at least one spring comprises a unitary leaf spring attached to the blade holder and extending substantially the full length of the holder for biasing each blade segment downward.

9. A recovery tool as set forth in claim 4 wherein the ends of adjacent blade segments abut one another such that there are no significant gaps between the segments.

10. A recovery tool as set forth in claim 4 wherein the blade segments are formed from a hard, plastic material.

11. A recovery tool as set forth in claim 2 wherein the first and second blade assemblies constitute a leading blade assembly and a trailing blade assembly relative to the direction of movement of the cleaning machine across a floor, and wherein the leading blade assembly is angled from vertical in the direction of machine movement and the trailing blade assembly is oriented substantially vertical.

12. For use in a floor cleaning machine of the type including a dispensing system configured for dispensing a liquid cleaning solution onto a floor surface to facilitate the removal of dirt from the floor surface, a recovery system configured for recovering cleaning solution and dirt from the floor surface thereby leaving a cleaned floor surface, said recovery system comprising:

a recovery tool movable over the floor surface, the recovery tool comprising a body including an interior suction chamber in fluid communication with a source of vacuum, and at least one elongate blade assembly comprising a pair of elongate blades depending from the tool body in spaced, generally parallel relationship, said blades being engageable with the floor surface to provide a seal between the blades and the floor surface, whereby cleaning solution and dirt are sucked from the floor surface, and said blades being movable relative to the tool body and relative to each other to adapt to contours in the floor surface.

13. A recovery system as set forth in claim 12 wherein each blade assembly further comprises a plurality of blade segments independently, resiliently mounted in the blade holder for floating movement of the individual segments with respect to the body and each other further enabling the blades to conform to uneven flooring, the segments being adapted to retain positive engagement down against the floor to reduce the size of any air gaps between the floor and the blades, thereby reducing vacuum losses due to uneven flooring and increasing the amount of cleaning water and dirt extracted from the floor.

14. A recovery system as set forth in claim 13 wherein each blade segment is independently biased downward to increase the contact force of the segments against the floor.

15. A recovery system as set forth in claim 14 wherein each blade assembly further comprises a plurality of coil springs each arranged vertically within the tool body such that a lower end of each spring presses downward against a respective blade segment to bias the segment downward for positive engagement with the floor.

16. A recovery system as set forth in claim 14 wherein said at least one spring comprises a unitary leaf spring attached to the blade holder and extending substantially the full length of the holder for biasing each blade segment downward.

17. A recovery system as set forth in claim 13 wherein the ends of adjacent blade segments abut one another such that there are no gaps between the segments.

18. A recovery system as set forth in claim 13 wherein the blade segments are formed from a hard, plastic material.

19. For use in a floor cleaning machine of the type including a dispensing system configured for dispensing a liquid cleaning solution onto a floor surface to facilitate the removal of dirt from the floor surface, a recovery system configured for recovering cleaning solution and dirt from the floor surface thereby leaving a cleaned floor surface, said recovery system comprising:

a recovery tool movable over the floor surface, the recovery tool comprising a body including an interior suction chamber in fluid communication with a source of vacuum and at least one blade secured to the tool body and depending therefrom for engagement with the floor surface to provide fluid communication between the suction chamber and the floor surface whereby cleaning solution and dirt are suctioned from the floor surface, the blade comprising a plurality of blade segments independently, resiliently mounted on the tool for floating movement of the individual segments with respect to the body and each other further enabling the segments to conform to uneven flooring, the segments being adapted to retain positive engagement down against the floor to reduce the size of any air gaps between the floor and the blades, thereby reducing vacuum losses due to uneven flooring and increasing the amount of cleaning water and dirt extracted from the floor.

20. In a cleaning machine comprising a main housing, at least one spray nozzle mounted on the main housing for spraying a cleaning solution onto a floor surface, a brush housing mounted on the main housing, said brush housing including at least one scrub brush for agitating a floor surface, and a recovery tool mounted on the main housing for vacuuming the used cleaning solution from the floor surface, wherein the improvement is an improved recovery tool comprising:

a recovery tool body tool movable over the floor surface, said tool body including an interior suction chamber in fluid communication with a source of vacuum and at least one elongate blade assembly secured to the tool body, said blade assembly comprising a resiliently mounted blade engageable with the floor surface to provide a seal between the blade and the floor surface, so that the source of vacuum suctions cleaning solution and dirt from the floor surface, the blade being substantially rigid to inhibit deformation of the blade during operation of the floor cleaning machine and being movable relative to the tool body such that the blade remains substantially in engagement with the floor surface along the length of the blade as the recovery tool is moved over contours in the floor surface.