The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 1987
Filed:
Jan. 27, 1986
David W Wood, Maple Plain, MN (US);
Advance Machine Company, Spring Park, MN (US);
Abstract
A floor polishing machine according to the preferred form of the teachings of the present invention includes a body portion having a platform, and a handle pivotally mounted to the platform. First and second sets of wheels are provided adjacent the rear of the platform and on opposite sides of the handle pivot. For coupling the handle and the platform together, torsion springs are provided having first ends anchored to the platform and having second ends connected to the handle. The torsion springs urge the platform to pivot about the first set of wheels downwardly in the rear and upwardly in the front. The level of the second set of wheels is slightly above the level of the first set of wheels for limiting the amount of upward movement of the front of the platform by the torsion springs when the polishing member is not being rotated by the motor allowing a partial vacuum to be formed under the polishing member when it is rotated by the motor to place a downward suction on the polishing member and counteracting with the torsion springs to place an even force on the floor surface by the polishing member regardless of the pivotal position of the handle with respect to the platform and regardless of the unevenness of the floor surface.