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:
Jan. 11, 1994
Filed:
Jul. 02, 1992
Applicant:
Inventors:
Robert D Hennessey, Golden Valley, MN (US);
Michael S Wilmo, Crystal, MN (US);
Assignee:
Tennant Company, Minneapolis, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
E01H / ;
U.S. Cl.
CPC ...
15 83 ; 15246 ;
Abstract
A surface maintenance machine includes a cylindrical brush mounted in the machine for rotation about a generally horizontal axis extending transverse to the direction of machine movement. A recirculation flap is attached to the machine and extends generally coextensively with the brush and parallel thereto. The recirculation flap is normally yieldingly urged toward the brush, with contact between the flap and a floor obstacle causing the flap to move, against the force of its mounting springs, away from the brush.