GB1366232A - Braking and pressure imbalance detector - Google Patents

Abstract

1366232 Detector for a two-circuit brake system SOC ANON DBA 16 April 1973 [18 May 1972] 18266/73 Heading F2E A device for use with a two circuit brake system for detecting braking and failure of one of the circuits comprises two pistons 16, 18 responsive to pressures in the respective circuits to move towards one another in opposition to a resilient member 24; the resilient member 24 comprises a metal sheet forming two opposite dihedrons 26, 28 with a common vertex and being supported in a housing 14 on the dihedron 26, the pistons 16, 18 moving substantially at right-angles to the respective surfaces of the dihedron 28. When both circuits are working the pistons 16, 18 move to close the dihedron 28 which thereby makes contact with contacts 42, 44 to cause a brake light 58 to come on. Should one circuit fail only one piston, say piston 16, acts on the resilient member 24 and the dihedron 28 will pivot about its vertex to make contact with contacts 42, 54. Light 58 will come on as before and so also will light 62 to indicate a circuit failure. With piston 16 inoperative contacts 44, 52 will be contacted by dihedron 28 to make lights 58, 60 come on. As shown, the device is integral with a master-cylinder the pistons 16, 18 being contained in bores 20, 22 in the master cylinder wall 10. A cover 12 of insulating material is fixed to wall 10 to define the housing 14 and supports the contacts 42, 44, 52, 54. A pivot pin 30 supports the resilient member 24 and a flexible sheet or strip 40 is provided in the mouth of the dihedron 28.