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:
May. 05, 1981
Filed:
Jul. 02, 1979
Robert K Neff, St. Louis, MO (US);
David P Hillstead, St. Charles, MO (US);
ACF Industries, Inc., New York, NY (US);
Abstract
In a railway car truck a lower transom extends between transversely spaced side frames. The side frames include depressed portions having transversely aligned vertical openings or slots which receive spring groups. A bolster including a center connection extends between the side frames above the transom and rests on the spring groups. The side frames each include a hollow post extending upwardly between the spring groups. The bolster includes a depending post which surrounds the side frame post. A friction damping assembly including upper and lower wedges is located within the side frame post and the bolster post. The upper and lower wedges include rear wear plates which engage the side frame post. The upper and lower wedges include an opening to receive a spring extending upwardly from the side frame depressed portion. The lower wedge has at least one inclined surface which slidingly engages at least one inclined surface on the upper wedge. The upper surface of the upper wedge engages the lower surface of the bolster. Oscillations of the spring group and bolster are damped by the rear wear surfaces forced outwardly by the inclines of the upper and lower wedges as the bolster moves downwardly with respect to the side frames.