Sequential actuation skirt and brush floor scrubber

• US 6,249,926 B1
• Filed: 09/30/1999
• Issued: 06/26/2001
• Est. Priority Date: 09/30/1999
• Status: Expired due to Fees

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Wulff, Richard F.
• Primary Examiner(s): Spisich, Mark
• Application Number:
  US09/409,506
• Time in Patent Office: 635 Days
• Field of Search: 15/501, 153/20, 153/403, 153/404
• US Class Current: 15/50.1
• CPC Class Codes: A47L 11/283 the tools being disc brushes
• CPC Class Codes: A47L 11/4077 Skirts or splash guards

Abstract

A cleaning machine employing a vertically shiftable brush and motor assembly, a separate vertically shiftable skirt/splash guard assembly, and a cooperative arrangement between the brush and skirt assemblies causing controlled elevation of the skirt with elevation of the brush. Both the skirt and the brush remain in optimum engagement with a floor surface during operation, but the skirt is elevated cooperatively with elevation of the brush using a lost motion engagement.

Claims

1. A floor cleaning machine comprising:

a vehicle frame including floor-engagement wheels;

floor scrubber brushes;

scrubber brush motors operably engaged with said brushes;

a brush frame supporting said brushes and brush motors;

said brush frame being pivotally mounted on a horizontal pivot connection to said vehicle frame, allowing vertical movement of said brush frame, brushes and brush motors;

a floor-engagement wheel on said brush frame spaced from said pivot connection;

a power lifter between said vehicle frame and said brush frame;

floor engagement skirts, skirt assemblies mounting said skirts and being pivotally mounted to said vehicle frame allowing vertical movement of said skirt assemblies and said skirts; and

engagement means between said brush frame and said skirt assemblies for causing said brush frame to lift said skirt assemblies with actuation of said power lifter.

2. The floor cleaning machine in claim 1 wherein said engagement means comprises lost motion engagement elements enabling said brush frame to move a greater amount than said skirt assemblies.

3. The floor cleaning machine in claim 1 wherein said engagement means comprises a lifting element on said brush frame and a liftable element on said skirt assemblies vertically aligned with said lifting element for engagement between said lifting element and said liftable element for lifting said skirt assemblies with elevation of said brush frame.

4. The floor cleaning machine in claim 3 wherein said lifting element, during operation of said machine, is spaced below said liftable element.

5. A floor cleaning machine comprising:

a vehicle frame including floor-engagement wheels;

at least one floor scrubber brush;

a scrubber brush motor for each said at least one scrubber brush, operably engaged with said brush;

a brush frame supporting said brush and brush motor;

said brush frame being pivotally mounted on a horizontal pivot connection to said vehicle frame, allowing vertical movement of said brush frame, brush and brush motor;

a power lifter between said vehicle frame and said brush frame;

floor engagement skirts, and skirt assemblies mounting said skirts and being pivotally mounted to said vehicle frame allowing vertical movement of said skirt assemblies and skirts; and

engagement elements between said brush frame and said skirt assemblies causing said brush frame to lift said skirt assemblies with lifting actuation of said power lifter.

6. The floor cleaning machine in claim 5 including at least one floor-engagement wheel on said skirt assemblies, spaced from said pivot connection.

7. The floor cleaning machine in claim 5 wherein said engagement elements result in lost motion whereby said brush frame will be lifted by said power lifter a predetermined distance before lifting of said floor engagement skirts.

8. A floor cleaning machine comprising:

a vehicle frame with wheels;

a brush frame and motor driven brushes on said brush frame;

said brush frame being vertically movably mounted relative to said vehicle frame, and an actuator for vertically elevating said brush frame;

a floor engagement skirt for retaining cleaning fluid beneath the machine, and a skirt assembly, said skirt assembly and skirt being vertically movably mounted relative to said vehicle frame; and

lift actuator mechanism for lifting said brush frame, skirt assembly and skirt;

wherein said actuator is translationally interconnected to said brush frame such that said brush frame is allowed to move vertically relative to said actuator when said actuator is in a lowest position, thereby allowing said brush frame and brushes to follow an uneven floor surface without interference from said actuator.

9. The floor cleaning machine in claim 8 wherein said lift actuator mechanism includes an interference engagement between said brush frame and said skirt assembly whereby said lift actuator mechanism lifts both said brush frame and said skirt assembly.

10. The floor cleaning machine in claim 9 wherein said interference engagement includes lost motion causing said brush frame to be elevated a predetermined amount before lifting of said skirt assembly.

11. The floor cleaning machine in claim 8 wherein said actuator includes a first linkage having a slot and a second linkage having a pin, said pin being configured to slide within said slot to thereby translationally interconnect said actuator to said brush housing.

12. The floor cleaning machine in claim 8 wherein said lift actuator mechanism includes a lifting element on said brush frame and a liftable element on said skirt assembly vertically aligned with said lifting element for engagement between said lifting element and said liftable element for lifting said skirt assembly with the elevation of said brush frame.

13. The floor cleaning machine in claim 12 wherein said actuator is substantially vertically arranged, with an upper end of said actuator connected to said vehicle frame and a lower end of said actuator connected to said brush frame.

14. The floor cleaning machine in claim 8 wherein said brush frame and said brushes can move vertically while maintaining a generally horizontal orientation to a floor surface.

15. The floor cleaning machine in claim 8, wherein said brush frame includes a floor-engagement wheel.