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:
Aug. 22, 1978
Filed:
Dec. 01, 1976
Gerald D Garner, Florissant, MO (US);
James C Hammonds, St. Charles, MO (US);
Jan D Holt, St. Charles, MO (US);
Conway H Melcher, Kirkwood, MO (US);
ACF Industries, Incorporated, New York, NY (US);
Abstract
A railway car truck assembly includes spaced side frames supported by truck journal bearings. A bolster extends transversely between the side frames. A spring assembly is supported on the spaced side frames and engages the lower surface of the boltster. The bolster includes a center bearing and a pair of side bearings mounted on either side of the center bearing. The side bearings receive the weight of the car body. Each of the side bearings includes an upper surface made of a first low friction material. The car body includes a depending center portion engaging the center bearing and spaced side portions having a lower surface made of a second low friction material engaging the side bearings. One of the first and second low friction materials is selected from nylon polyesters, polycarbonates, polyacetals and polysulfones. The other of the first and second low friction materials is selected from polytetrafluoroethylene. The coefficient of friction between the upper and lower surfaces is sufficiently low that the truck easily rotates with respect to the car body. The second low fricion material may optionally include a polymeric polyolefin component such as polyethylene, having a low exchange time, and the minor amount of a chemically inert fluorinated hydrocarbon polymeric material such as polytetrafluoroethylene.