David R Lindgren

US Patent:

61654108, Dec 26, 2000

Filed:

Feb 9, 1999

Appl. No.:

9/247729

Inventors:

Craig A. Crees - Sioux City IA
Floyd C. Egdorf - Sioux City IA
Robert S. Jacobsen - Sioux City IA
Mike J. Jordan - Sioux City IA
David R. Lindgren - South Sioux City NE
Steven A. Mathieson - Sioux City IA
Douglas G. Milner - Sioux City IA
Larry L. Minter - Jefferson SD
John R. Sunderman - Omaha NE

Assignee:

Missouri Valley Steel Company - Sioux City IA

International Classification:

B23K 708

US Classification:

266 49

Abstract:

A downdraft exhaust cutting table comprising an elongated cutting table having a cutting torch positioned thereover and which is movable along the length thereof to cut material positioned on the cutting table. An elongated exhaust duct is positioned beneath the cutting table and runs parallel to the length of the cutting table. The exhaust duct has a plurality of horizontally spaced-apart exhaust openings formed therein which close by a movable damper. In one embodiment, successive dampers are opened as a slag collection bucket moves along the length of the cutting table below the cutting torch. In a second embodiment, a plurality of ventilation zones are created by pivotal gates extending laterally outwardly from the exhaust duct and which are pivotally movable to permit slagger to pass therethrough.