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:
Jun. 10, 1980
Filed:
Jun. 26, 1978
Rolf B Lundgren, Ornskoldsvik, SE;
Mo och Domsjo Aktiebolag, Ornskoldsvik, SE;
Abstract
A screw conveyor is provided capable of maintaining a relatively uniform flow of conveyed material, even when operating well below its flow capacity, having a helical screw with a plurality of helical blade segments at one end, each segment extending over an arc of from about 100.degree. to about 130.degree. about the central stem of the screw, and having a pitch length within the range from about 0.5 to about 3 times the pitch length of the helical screw; the pitch length of the helical screw being from about 0.5 to about 1 times its diameter; the segments being spaced apart a distance within the range from about 0 to about 22 mm; the plurality of segments taken collectively defining a plurality of through passages extending axially along the central stem of the screw, and extending in uniformly spaced relationship .+-.10.degree. circumferentially about the 360.degree. circumference of the passage; each segment having a base portion attached at its inner periphery to the central stem of the screw over an arc of from about 50.degree. to about 60.degree., and a wing portion extending about and closely abutting the inside wall of the passage, and terminating in a tip abutting the inside passage wall, the wing portion defining an open space between its inner periphery and the central stem of the screw, the space forming a part of a through passage defined by the segments.