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:
Dec. 11, 1979
Filed:
Dec. 04, 1975
Johannes Liebscher, Nassau, DE;
Rolf G Schulein, Singhofen, DE;
Leifheit International Guenter Leifheit GmbH, Nassau, DE;
Abstract
A cleaning device has a main brush which picks up dirt from a surface to be cleaned and deposits it in dirt-collecting receptacles as the cleaning device is moved over the surface to be cleaned. A pair of additional brushes is mounted in corner regions of the housing and delivers dirt toward the main brush. The additional brushes are rotated as the cleaning device is moved over the surface in opposite directions, and they are mounted in bearings for limited pivoting substantially in the opposite directions so that those portions of the bristles of the additional brushes which move toward the main brush are in contact with the surface to be cleaned. A driving wheel rotates the additional brushes in opposite angular directions depending on the direction of movement of the cleaning device, the additional brushes and the driving wheel being partly supported in a main portion of the housing, and partly in a cover which is connected to the main portion of the housing. Each of the additional brushes may be mounted in a sleeve with snap action, the respective sleeve carrying a bevel gear which meshes with a bevel gear mounted at an end portion of a shaft on which the driving wheel is mounted for shared rotation therewith. One of the bearings which supports the sleeve and thus the additional brush is shaped as an elongated opening which extends in the opposite directions or at slight angles thereto toward the center of the cleaning device.