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:
Aug. 21, 1984
Filed:
Jan. 19, 1983
Michael L Blehert, Crystal, MN (US);
Tennant Company, Minneapolis, MN (US);
Abstract
An air flow control mechanism is provided in the debris pick-up head (10) of a sweeper to allow selective sweeping of debris. The pick-up head (10) is provided a center skirt (70) which partitions the head interior into two sweeping chambers, a rearward chamber (74) and a forward chamber (75). A filler piece (76) in the rearward chamber (74) lowers the ceiling of the chamber (74) sufficiently to create an air flow velocity differential between the two chambers. Forced air flow directed into the rearward chamber (74) becomes high-velocity, air flow capable of transporting relatively heavy debris to a suction outlet (66) for removal to a collection hopper (13). The forward chamber (75) has low-velocity air flow therethrough for sweeping relatively lighter debris to the suction outlet (66). The air flow control mechanism is adjustable to allow effective sweeping for various combinations of debris densities and sizes. Further, a nozzle-like head (63) introduces the forced air into the pick-up head (10) in a manner which induces the air flow to swirl about the area prior to flowing into the rearward chamber (74) thus achieving a sweeping path the full width of the pick-up head.