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:
Mar. 10, 1987
Filed:
Jun. 17, 1985
Eugene W Schmitt, Lockport, IL (US);
Robert E Campbell, Arlington Heights, IL (US);
Sloan Valve Company, Franklin Park, IL (US);
Abstract
An empty and load valve for a railroad car brake system is mounted on the bolster of a truck and has a sensing arm engageable with a side frame of the truck. An empty and load device is mounted on each intermediate truck of an articulated car. The device has a valve body with a manifold and an equalizing reservoir attached thereto. A first air passage extends through the valve body and a second air passage extends in the valve body from the first air passage to the equalizing reservoir. A piston assembly is reciprocable in the first air passage to open and close the passage and thereby proportion the available air supply. A plunger is movable in the valve body in response to the sensing arm to disable the piston assembly when a loaded condition is sensed. The plunger also allows a valve in the second air passage to close when a loaded condition is sensed so that all of the available air supply is supplied to the brake actuator.