Method and device for the treatment of the upper surfaces of rails
Patent 5067283 Issued on November 26, 1991. Estimated Expiration Date: 
November 13, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 13, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3850691 Rail grinding system Patent #: 4178724 InventorAssigneeApplicationNo. 611793 filed on 11/13/1990US Classes:451/347, Rail abrader104/279, TRACK CLEARERS451/28, ABRADING PROCESS451/444Tool cleanerExaminersPrimary: Parker, Roscoe V.Attorney, Agent or FirmForeign Patent References
International ClassE01B 031/17Foreign Application Priority Data1989-11-14 DEAbstractA method and a device for treating the upper surfaces of rails, where the upper surfaces of rails (3) are acted upon by movable grinding blocks (7) disposed on a bogie which can be moved along on the tracks and where a plurality of grinding blocks (7) is used. The grinding blocks (7) are periodically lifted and lowered again singly or in groups, cleaning of the work face of the grinding block (7) being performed during the lifting of the respective grinding block (7). In case of curves in the rails, a change of the position of the grinding block (7) in relation to a hydraulic unit (11), which vertically moves the grinding block (7), is detected by proximity switches (12), and the position of the hydraulic unit (11) can then be adjusted via a transverse guide (10). | |
