Speed-deceleration warning system for motor vehicles

DETAILED DESCRIPTION An object of this invention is to provide a system for sending a warning to the driver if speed-deceleration of a vehicle does not reach an expected value although hydraulic brake pressure rises over a prescribed value.
Another object of this invention is to provide a speed-deceleration warning system for a motor vehicle which applies the balance of the gravitational force of a ball or weight and the inertial force of said ball or weight.
A further object of this invention is to provide a speed-deceleration warning system for a motor vehicle which applies the balance of an initial stress of a spring member and an inertial force of a weight.
A system according to this invention, which sends a warning to the driver if speed-deceleration of a vehicle does not reach an expected value although hydraulic brake pressure rises over a prescribed value, comprises pressured-oil supply means connected to a master cylinder of a brake mechanism, a hydraulic switch including a first contact moved by the action of pressured-oil, a speed-deceleration switch including a second contact moved by the influence of a vehicle's speed-deceleration, and an electric circuit extending to a warning element through said first and second contacts.
An aforesaid speed-deceleration switch can be advantageously constructed to move said second contact by the influence of the balance between the gravitational force of a ball or weight and the inertial force of said ball or weight, and also advantageously constructed to move said second contact by the influence of the balance between a predetermined initial stress of a spring member and an inertial force of a weight.