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:
Jul. 30, 2002
Filed:
Dec. 20, 2000
Robert D. Wronkiewicz, Park Ridge, IL (US);
Scott K. Pierson, Mokena, IL (US);
AMSTED Industries Incorporated, Chicago, IL (US);
Abstract
A friction shoe is provided for use in a railway freight car truck. A freight car truck comprises two laterally spaced sideframes with a bolster extending transversely between said sideframes. The bolster has two ends each of which extends into an opening in each sideframe and is supported by a spring group in each sideframe opening. A friction shoe is provided in a sloped pocket between each bolster end and a vertical face of the sideframe. The friction shoes are themselves comprised of a sloped wall, a vertical rear wall extending from a lower part of the rear wall to a lower part of the sloped wall, and side support walls. The friction shoe provides damping for the bolster supported on each spring group. The friction shoe of the present invention also includes generally circular openings in the side support walls.