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:
Feb. 13, 2007
Filed:
Jun. 23, 2004
Thomas R. Berg, St. Louis, MO (US);
Nathan J. Reese, Troy, IL (US);
Ralph H. Schorr, Edwardsville, IL (US);
Jeffrey M. Ruback, Edwardsville, IL (US);
Julius I. Pershwitz, Grantham, PA (US);
Thomas R. Berg, St. Louis, MO (US);
Nathan J. Reese, Troy, IL (US);
Ralph H. Schorr, Edwardsville, IL (US);
Jeffrey M. Ruback, Edwardsville, IL (US);
Julius I. Pershwitz, Grantham, PA (US);
ASF-Keystone, Inc., Granite City, IL (US);
Abstract
An improved three-piece truck system for railroad cars provides long travel side bearings for improved stability, a 'wide' friction shoe design or equivalent to improve sideframe and bolster squareness, a resilient pedestal pad for improved curving performance and enhanced wear resistance, and a suspension system tuned and optimized for rail cars to have a minimum reserve capacity of less than 1.5 to improve motion control and ride quality, increase resistance to suspension bottoming, and increase hunting threshold speed. Such a motion control truck system is able to meet recent, more stringent American Association of Railroads standards, such as M-976, for railcars having a 286,000 lb. gross rail load rating.