Automatic floor scrubber

• US 5,369,838 A
• Filed: 11/16/1992
• Issued: 12/06/1994
• Est. Priority Date: 11/16/1992
• Status: Expired due to Fees

• Current Assignee: Advanced Machine Company
• Original Assignee: Advance Machine Co. (Nilfisk Holding A/S)
• Inventors: Wood, David W., Allen, William F., Legatt, Donald J.
• Primary Examiner(s): Scherbel, David A.
• Assistant Examiner(s): Brinson, Patrick F.
• Application Number:
  US07/977,216
• Time in Patent Office: 750 Days
• Field of Search: 15/320, 15/401, 15/50.1, 15/98, 15/326, 15/353, 15/354, 15/359, 15/340.1, 15/385, 248/615, 248/638, 248/634
• US Class Current: 15/320
• CPC Class Codes: A47L 11/305 the tools being disc brushes
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4069 Driving or transmission means for the cleaning tools
• CPC Class Codes: A47L 11/4097 Means for exhaust-air diffusion; Exhaust-air treatment, e.g. air purification; Means for sound or vibration damping

Abstract

An automatic floor scrubber (10) is disclosed having its frame divided into a truck (12) and an upper assembly (14) isolated from each other by a multiplicity of elastomeric isolator mounts (106) arranged in a nonlinear fashion. The wheels (18, 20), the drive motor (22), the squeegee system (26), and the brush scrub system (28) are mounted to the subframe (16) of the truck (12). The control handle (46), solution tanks (48, 50), and batteries (74) are mounted to the chassis (44) of the upper assembly (14). The mounts (106) include integral first and second portions (108, 110), with the first portion (108) sandwiched between the subframe (16) and the chassis (44) and the second portion (110) insertable into a mount aperture (118) and axially compressed into a mushroom shape by bolts (122) to capture the mount aperture (118). An acoustical tunnel (84) extends longitudinally in the chassis ( 44) intermediate the batteries (74) and defines a closed volume lined with foam sheets (88). The outlet hose (104) of the vacuum system (52) extends through the open end of the tunnel (84) and exhausts the air therein, with the air escaping from the closed volume flowing around the outlet hose (104) and through the open end of the tunnel (84).

Claims

1. Machine for cleaning floors comprising, in combination:

a truck comprising, in combination;

a subframe, means mounted to the subframe for movably supporting the subframe upon the floor, means mounted to the subframe for moving the subframe upon the floor, and means mounted to the subframe for scrubbing the floor;

an upper assembly comprising, in combination;

a chassis, at least a first tank carried by the chassis for holding floor cleaning solution, and a control handle mounted to the chassis; and

suspension means between the subframe and the chassis for mounting the chassis to the subframe and dampening the transmission of vibrations at all attachments between the subframe and the chassis.

2. The floor cleaning machine of claim 1 wherein the scrubbing means comprises, in combination:

at least one brush mounted for rotation about an axis; and

means for rotating the brush about the axis.

3. The floor cleaning machine of claim 2 further comprising, in combination:

a vacuum squeegee assembly mounted to the subframe;

a vacuum system for placing the first tank under vacuum; and

conduit means extending between the vacuum squeegee assembly and the first tank.

4. The floor cleaning machine of claim 3 further comprising, in combination:

a second tank carried by the chassis for holding floor cleaning solution; and

means for dispensing the floor cleaning solution from the second tank to the floor.

5. The floor cleaning machine of claim 4 further comprising, in combination:

at least a first battery mounted to the chassis, with at least the moving means being battery powered.

6. The floor cleaning machine of claim 5 wherein the suspension means comprises, in combination:

a multiplicity of elastomeric isolator mounts between the chassis and the subframe and arranged in a nonlinear fashion.

7. The floor cleaning machine of claim 6 wherein each of the elastomeric isolator mounts comprises, in combination:

a first portion and a second portion integrally attached to the first portion, with the first portion being sandwiched between the subframe and the chassis, with the second portion being insertable into and capturable in a mount aperture formed in one of the subframe and the chassis.

8. The floor cleaning machine of claim 7 wherein each of the elastomeric isolator mounts further comprises, in combination:

means for axially compressing the second portion to selectively expand the second portion into a mushroom shape to capture the mount aperture.

9. The floor cleaning machine of claim 8 wherein the axially compressing means comprises, in combination:

an axial counterbore extending into the second portion and spaced from the first portion;

a washer for abutting with the axial end of the second portion;

an axial bore extending through the first and second portions, with the axial counterbore being of a larger diameter than the axial bore;

a rigid bushing positioned in the axial bore from the axial end of the first portion to the axial counterbore of the second portion;

a securement aperture formed in the other of the subframe and the chassis; and

bolt means extending through the securement aperture, the bushing, the axial counterbore, and the washer.

10. The floor cleaning machine of claim 1 wherein the suspension means comprises, in combination:

a multiplicity of elastomeric isolator mounts between the chassis and the subframe and arranged in a nonlinear fashion.

11. The floor cleaning machine of claim 10 wherein each of the elastomeric isolator mounts comprises, in combination:

a first portion and a second portion integrally attached to the first portion, with the first portion being sandwiched between the subframe and the chassis, with the second portion being insertable into and capturable in a mount aperture formed in one of the subframe and the chassis.

12. The floor cleaning machine of claim 11 further comprising, in combination:

a multiplicity of securement apertures formed in the other of the subframe and the chassis, and a multiplicity of bolt means extending through each of the bushings and the securement apertures, with the mount apertures being concentric and spaced from the bolt means.

13. The floor cleaning machine of claim 1 further comprising, in combination:

a vacuum squeegee assembly mounted to the subframe;

conduit means extending between the vacuum squeegee assembly and the first tank;

a vacuum system having an inlet and an outlet, with the inlet in fluid communication with the first tank; and

an acoustical tunnel formed in the upper assembly, with the acoustical tunnel defining a closed volume preventing escape of air therethrough, with the closed volume being covered by sound reducing material, with the outlet in fluid communication with the closed volume, with the air escaping from the closed volume in a direction generally opposite to the direction that air is introduced by the outlet into the closed volume.

14. In a machine for cleaning floors including means for movably supporting the machine upon the floor, means for moving the machine upon the floor, means for scrubbing the floor, and at least a first tank for holding floor cleaning solution, an improved suspension system comprising, in combination:

a truck, with the movably supporting means mounted to the truck;

an upper assembly, with the first tank carried by the upper assembly; and

a multiplicity of elastomeric isolator mounts between the truck and the upper assembly and arranged in a nonlinear fashion for dampening the transmission of vibrations at all attachments between the truck and the upper assembly.

15. The floor cleaning machine of claim 14 wherein each of the elastomeric isolator mounts comprises, in combination:

a first portion and a second portion integrally attached to the first portion, with the first portion being sandwiched between the truck and the upper assembly, with the second portion being insertable into and capturable in a mount aperture formed in one of the truck and the upper assembly.

16. The floor cleaning machine of claim 15 wherein each of the elastomeric isolator mounts further comprises, in combination:

an axial counterbore extending into the second portion and spaced from the first portion;

an axial bore extending through the first and second portions, with the axial counterbore being of a larger diameter than the axial bore;

a washer for abutting with the axial end of the second portion;

a rigid bushing positioned in the axial bore from the axial end of the first portion to the axial counterbore of the second portion;

a securement aperture formed in the other of the truck and the upper assembly; and

bolt means extending through the securement aperture, the bushing, the axial counterbore, and the washer for axially compressing the second portion to selectively expand the second portion into a mushroom shape to capture the mount aperture.

17. The floor cleaning machine of claim 15 further comprising, in combination:

a multiplicity of securement apertures formed in the other of the truck and the upper assembly, and a multiplicity of bolt means extending through each of the bushings and the securement apertures, with the mount apertures being concentric and spaced from the bolt means.

18. In a machine for cleaning a surface comprising, in combination:

a frame;

means for movably supporting the frame upon the surface;

a vacuum squeegee assembly mounted to the frame;

a first tank carried by the frame for holding surface cleaning solution;

conduit means extending between the vacuum squeegee assembly and the first tank;

a vacuum system having an inlet and an outlet;

conduit means extending between the inlet of the vacuum system and the first tank; and

an acoustical tunnel formed in the frame, with the acoustical tunnel defining a closed volume preventing escape of air therethrough, with the closed volume being covered by sound reducing material, with the outlet of the vacuum system in fluid communication with the closed volume, with the air escaping from the closed volume in a direction generally opposite to the direction that air is introduced by the outlet of the vacuum system into the closed volume.

19. The surface cleaning machine of claim 18 wherein the closed volume has an open end, with the outlet of the vacuum system extending through the open end and into the closed volume, with the open end having a size substantially larger than the outlet, with the air escaping from the closed volume flowing around the outlet of the vacuum system and through the open end.

20. The surface cleaning machine of claim 19 further comprising, in combination:

at least a first battery mounted to the frame, with the vacuum system being battery powered, with the acoustical tunnel being generally parallel to and adjacent the battery.

21. The surface cleaning machine of claim 20 wherein the acoustical tunnel is elongated having a gable-shaped cross section.