Parking brake lock-in key switch system for vehicle air brake system
US6234586A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Jun 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/08
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A parking brake lock-in key switch system for a truck or bus brake system. The system has two parking brake lock-in valves. One parking brake lock-in valve is installed in the air line piping between the primary air tank and the push pull double check valve and the second parking brake lock-in valve is in the air line piping between the secondary air tank and the push pull double check valve. The parking brake lock-in valves are air operated valves which when closed will look in actuated parking brakes. The parking brake lock-in valves are operated by a solenoid operated pilot valve which provides air from an air supply to close the lock-in valves when the ignition key is moved to the `off` position. An actuated parking brake will be locked in because new air from the respective tanks will be prevented from flowing to the push pull double check valve and hence the brake chambers. The parking brake lock-in valve does not vent off downstream piping when it closes. Should the ignition key be positioned to the `off` position with the vehicle in motion and the parking brake actuator is not engaged in the park position, air will be locked in the air line piping between the parking brake …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.