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. 07, 1982
Filed:
Aug. 14, 1980
James P Koenig, Cuyahoga, OH (US);
The Bendix Corporation, Southfield, MI (US);
Abstract
A fluid pressure braking system for an articlated vehicle having a towed unit and a towing unit includes a source of fluid pressure carried on the towing unit and a supply line (68) and a service line (70) which communicates the braking system on the towing unit with the braking system on the towed unit. A proportioning valve (36) controls communication to the relay valve (42) which communicates braking pressure to the rear wheel service brakes of the towing unit. The proportioning valve (36) is connected through a control port (82) to an inversion valve (76). The inversion valve (76) is responsive to fluid pressure in the supply line (68) to communicate a pressure signal to the control port (82) when the pressure level in the supply line (68) drops below a predetermined level. The proportioning valve (36) is responsive to the pressure signal on the control port (82) to proportion communication to the control port of the relay valve (42). Accordingly, when the pressure level in the supply line (68) drops below the predetermined level, which indicates that the towed unit has been disconnected from the towing unit, the proportioning valve (36) cuts down on the braking pressure communicated to the rear wheel brakes of the towing unit. On the other hand, when the pressure in the supply line (68) is above the predetermined level, thereby indicating that the towing unit and towed unit are connected, the proportioning valve (36) permits substantially uninhibited communication to the relay valve (42).