Scrubbing machine with tracking squeegee

• US 4,173,056 A
• Filed: 06/26/1978
• Issued: 11/06/1979
• Est. Priority Date: 06/26/1978
• Status: Expired due to Term

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Geyer, Robert A.
• Primary Examiner(s): Moore, Christopher K.
• Application Number:
  US05/918,771
• Time in Patent Office: 498 Days
• Field of Search: 15/50 C, 15/50 R, 15/320, 15/353, 15/401
• US Class Current: 15/320
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/4044 Vacuuming or pick-up tools; Squeegees
• 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 11/4072 Arrangement of castors or wheels

Abstract

A scrubbing machine is provided including a vacuum squeegee water pickup system. The machine is supported on a pair of drive wheels and a pair of pivotable wheels or casters. The squeegee is drawn by a principal arm and the location of the squeegee is controlled by a steering arm.

Claims

1. A scrubbing machine including a body structure, a plurality of wheels supporting said body, means for depositing scrubbing solution on a surface to be scrubbed thereby providing a wetted path and scrubbing brush means for working said solution on said surface, and vacuum squeegee means for picking up said solution from said surface said squeegee means being disposed rearwardly of said wheels, said squeegee means including draw bar means for pulling said squeegee means along said wetted path and steering bar means for tracking said squeegee means along the wetted path both while traveling along a straight line and when traveling along an arcuate path.

2. The scrubbing machine of claim 1 wherein said draw bar means lies along the centerline of the scrubbing path when said machine moves in a straight line.

3. The scrubbing machine of claim 2 wherein said steering bar means lies at an angular relationship with said draw bar means when said machine moves in a straight line and wherein said steering bar means pushes said squeegee means radially outwardly to follow the scrubbing path when said machine is following an arcuate path.

4. The scrubbing machine of claim 3 wherein said draw bar means includes a pair of ends and wherein one end of said draw bar means is pivotally secured to said body and wherein the other end of said draw bar means is pivotally secured to the squeegee means.

5. The scrubbing machine of claim 4 wherein said steering bar means includes a pair of ends and wherein one end of said steering bar means is pivotally secured to said body at a point to the rear and to the side of said draw bar-body pivot point and wherein the other end of said steering bar means is pivotally secured to the squeegee means.

6. A scrubbing machine including:

a body structure;

front and rear wheel means for movably suporting said body, said front wheel means including an axle;

means for providing a wetted path;

scrubbing brush means for scrubbing a wetted path, said brush means being carried by said body, said brush means being disposed forwardly of said front wheel means;

vacuum squeegee means for picking up scrubbing solution from said wetted path, said squeegee means being carried by said body, said squeegee means being disposed rearwardly of said front wheel means;

drawing bar means for pulling said squeegee means, said drawing bar means having a pair of ends, said drawing bar means being pivotally attached at one end with respect to said body and at the other end to said squeegee means;

steering bar means for steering said squeegee means, said steering bar means having a pair of ends, said steering bar means being pivotally attached at one end with respect said body and at the other end to said squeegee means, said steering bar means one end and said steering bar other end being on opposite sides of said drawing bar means.

7. The scrubbing machine of claim 6 wherein said one end of the drawing bar means is spaced rearwardly of said axle and wherein said one end of the steering bar means is spaced rearwardly of said axle at least as far as the one end of the drawing bar means.

8. The scrubbing machine of claim 7 wherein the pivot point of said one end of the steering bar means is located in a zone, said zone being defined at the forward most edge by a perpendicular line extending from the centerline of the straight wetted path at the pivot point of the one end of said drawing bar;

said zone being defined at the rear most edge by a perpendicular line extending from the said centerline at a point located to the rear of the pivot point of the one end of said drawing bar means a distance equal to 40% of the effective length of said drawing bar means;

said zone being defined at one side edge by a line parallel with said centerline and spaced from said centerline a distance equal to 10% of the effective length of said drawing bar means;

said zone being defined at the other side edge by a line parallel with said centerline and spaced from said centerline a distance equal to 40% of the effective length of said drawing bar means; and

wherein the pivot point of said other end of the steering bar means is located in a zone, said zone being defined at the rear most edge by a perpendicular line extending from said centerline at a point rearward of the other end of said drawing bar means a distance equal to 10% of the effective length of the drawing bar means;

said zone being defined at the forward most edge by a perpendicular line extending from said centerline at a point forward of the other end of said drawing bar means a distance equal to 20% of the effective length of the drawing bar means;

said zone being defined at one edge by a line parallel to said centerline and spaced from said centerline a distance equal to 15% of the effective length of the drawing bar means; and

the zone being defined by a line parallel to said centerline and spaced from the centerline a distance equal to 50% of the effective length of the drawing bar means.

9. The scrubbing machine of claim 7 wherein the drawing bar means lies along the centerline of the wetted path when traveling in a straight direction;

wherein the pivot point of said one end of the steering bar lies on a line extending from the pivot point of said one end of the drawing bar means, said line being at an angle of about 45°

with respect to the wetted path centerline and at a distance equal to 30%±

10% of the effective length of the drawing bar means; and

wherein the pivot point of the other end of the steering bar means lies on a perpendicular line extending from the straight centerline of the wetted path at the pivot point of the other end of the drawing bar means, the pivot point of the other end of the steering bar means being spaced from said centerline a distance equal to the spacing between said one end of the steering bar means and said one end of the drawing bar means.