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:
Dec. 10, 1996
Filed:
Mar. 01, 1996
Railway Technical Research Institute, Tokyo, JP;
Abstract
The present invention comprises longitudinal beams provided on the underside of each of a pair of rails in the longitudinal direction of the rails and multiple connectors which mutually connect these longitudinal beams at designated spacings along the longitudinal direction. Because the ladder-type sleepers of the present invention have a structure wherein longitudinal beams are continuously positioned along the longitudinal direction of the rails, the bending stiffness of the track frame in the longitudinal direction increases, and the ballast pressure is reduced by improving the distribution of the train load. As a result, it is possible to reduce track irregularities resulting from the repeated burden of the train load.