Scrubber squeegee pivoted concentric with brush drive

• US 4,805,256 A
• Filed: 10/02/1987
• Issued: 02/21/1989
• Est. Priority Date: 10/02/1987
• Status: Expired due to Fees

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Mason, Richard A., Koenigs, Philip E.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Reinckens, Corinne M.
• Application Number:
  US07/104,281
• Time in Patent Office: 508 Days
• Field of Search: 15/49 R, 15/50 R, 15/98, 15/320, 15/340, 15/355, 15/359, 15/385
• US Class Current: 15/320
• CPC Class Codes: A47L 11/283 the tools being disc brushes
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• CPC Class Codes: A47L 11/4058 for adjusting the height of the tool
• CPC Class Codes: A47L 11/4061 Steering means; Means for avoiding obstacles; Details related to the place where the driver is accommodated
• CPC Class Codes: A47L 11/4069 Driving or transmission means for the cleaning tools
• CPC Class Codes: A47L 11/4077 Skirts or splash guards
• CPC Class Codes: A47L 11/4088 Supply pumps; Spraying devices; Supply conduits

Abstract

This invention is concerned with a machine in the nature of a scrubber for removing dirt, grime, etc. from a surface to be cleaned and includes a mobile machine with a scrub brush mounted for rotation about a generally vertical axis with a housing therefor which is pivotally mounted and concentric with the scrub brush drive. The brush, brush drive, brush housing and squeegees which are mounted on the brush housing, also make up a brush head assembly that is raised and lowered as a unit.

Claims

1. In a machine for removing soilage from a surface, a mobile frame and means for propelling it, a tool drive comprising a motor and a motor mount therefor attached to the frame, a disk surface cleaning tool connected to the tool drive disposed for rotation about a generally upright axis, means for raising and lowering the tool between a raised inoperative position for traveling and a lowered operative position for working, a tool housing around the tool which approaches the surface in the working position of the tool and is raised above the surface in the raised traveling position of the tool, a rotatable mounting for the tool housing concentric about the axis of the tool so that the tool housing may be rotated for at least a portion of a revolution about the upright axis independent of the tool and tool drive and the tool housing is free to circumferentially orient itself independently of movement of the mobile frame, an arcuate vacuum chamber disposed around on the order of 180°

of the periphery of the tool housing and defining a pick up for dirty scrubbing solution, and friction means engaging the surface causing the tool housing to automatically orient itself in response to movement of the mobile frame because of the force applied to it by the friction means so that the vacuum chamber is always in a trailing position.

2. The structure of claim 1 further characterized in that the friction means at least in part includes a squeegee disposed around on the order of 180°

of the periphery of the tool housing which causes the housing to circumferentially orient itself automatically in response to movement of the frame because of the force applied to the housing by frictional engagement of the squeegee with the surface being worked upon.

3. The structure of claim 2 further characterized by and including a continuous peripheral skirt on the tool housing that at least in part is defined by a rubberlike single bladed squeegee mounted on the 360°

periphery of the tool housing and extending downwardly therefrom so as to contact the surface being worked upon when the cleaning tool is in its lowered operative position.

4. The structure of claim 3 further characterized by and including a sliding connection generally concentric about the axis of the tool between the tool drive and tool housing so that the squeegee on the tool housing and the some 180°

squeegee exert pressure on the surface being worked upon independently of the cleaning tool when in the operative working position.

5. The structure of claim 4 in which the squeegees contact the surface being cleaned before the tool does when the tool is lowered to its operative working position and are raised out of contact with the surface being cleaned after the tool is raised therefrom when the tool is raised to its inoperative position for traveling.

6. The structure of claim 3 further characterized in that the single bladed squeegee extends around the full 360°

periphery of the tool housing and serves as and defines one boundary of the arcuate vacuum chamber.

7. The structure of claim 1 further characterized by and including a sleeve on the tool drive and a bushing on the tool housing which surrounds the tool drive sleeve and rotates around it.

8. The structure of claim 4 further characterized by and including a stop arrangement on the sliding connection which will allow the tool, tool drive and motor to descend somewhat after the squeegees attached to the tool housing engage the surface being worked upon and will engage and pick up the tool housing and squeegees after the disk tool has been raised from the surface.

9. The structure of claim 1 in which the machine is constructed to be operated in separate buffing and scrubbing modes, the tool housing having a generally continuous depending peripheral skirt that engages the surface being cleaned when the cleaning tool is in its lowered operative position for working and extends around the full 360°

periphery of the tool housing to define a dust control chamber during operation of the machine in its buffing mode, the arcuate vacuum chamber being bounded outwardly by a squeegee blade disposed around on the order of 180°

of the periphery of the housing and defining in conjunction with part of the peripheral skirt the vacuum chamber for dirty solution when the machine is being operated in its scrubbing mode.

10. In a machine for removing soilage from a surface, a mobile frame and means for propelling it, a tool drive comprising a motor and a motor mount therefor attached to the frame, a disk surface cleaning tool connected to the tool drive disposed for rotation about a generally upright axis, means for raising and lowering the tool between a raised inoperative position for traveling and a lowered operative position for working, a housing around the tool to which is attached at least one squeegee disposed around on the order of 180°

of the periphery of the circular housing which engages the surface in the working position of the tool and is raised above the surface in the raised traveling position of the tool, and a rotatable mounting for the tool housing concentric about the axis of the tool so that the tool housing may be rotated for at least a portion of a revolution about the upright axis independent of the tool and tool drive and the tool housing is free to circumferentially orient itself independently of movement of the mobile frame in response to movement of the mobile frame because of the force applied to it by friction from the engagement of the squeegee with the surface being worked upon.