Failure warning switch actuator with automatic reset
US4041449A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1976 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | Apr 21, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/226
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A dual circuit brake system has a failure warning section in which the pressures in each of the circuits are sensed by a pair of pistons having a switch actuating shuttle positioned between the pistons by a pair of springs. The ends of the shuttle are telescoped in the pistons for guidance and relative movement. The switch pistons are relatively small with little travel, minimizing displacement loss. The centering springs do not have sufficient load to force the shuttle to the off position once failure in one system has occurred and the pressure in the remaining system has been released. Repair of the failed system allows pressure actuation to move the shuttle back to the deactuated position for automatic reset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.