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:
Sep. 11, 2001
Filed:
Mar. 09, 2000
Applicant:
Inventors:
Keith Young, Naperville, IL (US);
Stephen R. Kuhn, Richton Park, IL (US);
Assignee:
ABC-NACO Inc., Downers Grove, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E01B 7/00 ;
U.S. Cl.
CPC ...
E01B 7/00 ;
Abstract
An improved railroad trackwork spring wing frog assembly having a selectively releasable hold-open subassembly for the spring wing rail is provided with a combined compressible shock absorber and compression spring that are functionally connected to the assembly spring wing rail and to the assembly base plate, and that function to generate an opposing force in connection with opening movement of the spring wing rail and an augmented force in connection with closing movement of the spring wing rail.