Patent ID: 8480183
Filing Date: 2013-07-09
Classification: B60T

Abstract:
1. A parking brake interlock, comprising: a parking brake inlet configured to receive a parking brake air supply; a service brake inlet configured to receive a service brake air supply; an exhaust port; and an interlock valve mechanism in communication with the parking brake inlet, the service brake inlet, and the exhaust port, with the interlock valve mechanism being moved to an actuated position by provision of service brake air pressure from the service brake air supply, wherein the interlock valve mechanism blocks the exhaust port in the actuated position, and with the interlock value mechanism moving to a non-actuated position in an absence of the service brake air pressure, wherein the parking brake inlet is in communication with the exhaust port in the non-actuated position, and with the interlock valve mechanism being configured to continuously exhaust the parking brake air supply from the parking brake interlock if the service brake air supply is not received and being further configured to hold the parking brake air supply in order to generate a parking brake air pressure if the service brake air supply is received.