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. 29, 1976
Filed:
Jan. 13, 1975
William H Peterson, Homewood, IL (US);
Pullman Incorporated, Chicago, IL (US);
Abstract
A railroad car maximum speed limiting device including a railroad car wheel-driven generator and centrifugal speed responsive switch for operating a solenoid valve to supply vacuum to the vehicle brakes from an auxiliary vacuum reservoir after the vehicle has passed a magnetic trip operating a relay to complete the genertor circuit, the improvement comprising an air cylinder operated by trainline vacuum for moving the generator and centrifugal speed responsive switch wheel out of engagement with the car wheel for trainline operation, and a special shuttle valve on the cylinder for supplying braking vacuum to the cylinder alternately from the speed control auxiliary vacuum reservoir or from the main conventional vacuum reservoir.