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. 24, 1990
Filed:
Feb. 09, 1989
David E Chupka, Middletown, OH (US);
Irenee J Phillippe, Monroe, OH (US);
The Black Clawson Company, Middletown, OH (US);
Abstract
In screening apparatus for paper making stock comprising a cylindrical screening member dividing the interior of a pressure housing into a supply chamber and an accepts chamber, and also comprising a rotor mounted for rotation in the supply chamber and including a plurality of vanes mounted thereon in angularly spaced relation with each other and in relatively closely spaced relation with the screening member, each of the vanes is of generally airfoil shape and is oriented with its leading edge closest to the screening member and with the surface portion thereof trailing the leading edge diverging from the screening member to create a positive pressure force along the leading edge followed by a negative pressure force between the trailing portion and the screening member. A cap on each end of each vane extends radially outwardly from each end of the trailing portion of the vane and substantially closes the adjacent axial end of the space between the trailing portion of the vane and the screening member, and a bar is mounted on the trailing ends of each of these caps to define a slot extending along the trailing edge of the vane and leading directly from the space between the vane and the screening member to space on the radially inner side of the vane. This bar is located in more closely spaced relation with the screening member than the trailing portion of the vane to contain the negative pressure force developed by the vane within the space between the trailing portion of the vane and the opposed surface of the screening member.