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:
Jun. 11, 1996
Filed:
Aug. 23, 1994
Applicant:
Inventors:
V Terrey Hawthorne, Lisle, IL (US);
David J Goding, Palos Park, IL (US);
Assignee:
Amsted Industries Incorporated, Chicago, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B61F / ;
U.S. Cl.
CPC ...
1051984 ; 1051985 ;
Abstract
A variable spring group for a railcar wheel truck assembly, which spring group has independent variable rate control springs for biasing snubber assemblies of a bolster in the wheel truck assembly, with the spring group having a first linear spring rate at an empty-railcar condition and a second linear spring rate at a loaded railcar condition that is at least five times as great as the empty-car spring rate, and the control springs are variable rate springs with a first and empty-railcar rate and a second and loaded-railcar spring rate, which is about twice the empty car control spring rate.