| 摘要 |
A switch assembly for detecting a difference in hydraulic pressure and capable of detecting and issuing an alarm if leakage occurs in either one of two hydraulic pressure systems independent of each other, such as the pressure systems for the front and rear brakes in a motor-car, by means of an equilibrating piston acted on by the two independent pressures on its opposite ends and adapted to shift toward one end when leakage occurs in the corresponding system. In response to shifting of the piston, a leaf spring is pushed upward to come into contact with a switch terminal connected to a warning circuit thereby issuing an alarm for the leakage. The present switch assembly has the advantage that the alarm remains actuated without interruption until the spring is pushed back by an external force after repair, thereby completely avoiding an accident due to failure in repairing the leakage.
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