Abstract: Standard block comprising an element (L) kept in vibration by means of the motor (M). As soon as an object comes into mechanical contact with the measuring surface (C), the flexible-part (F) gives very slightly allowing the regulating screw (Vi) to disturb the free oscillations of the element (L). The detector (E) detects this disturbance and signals the moment of mechanical contact by means of the lamp (La) for example. The standard block allows precise measurements to be taken by announcing the moment of contact, without the measurement precision being influenced by the contact pressure.

Abstract: A contact sensing head, for example for a measuring device, comprises a sensor having a free end which is vibrated at low amplitude by a motor at the resonant frequency of the sensor. A transducer senses the vibrations and feeds a signal to an electronic detection system. When the sensor contacts an object, the frequency and amplitude of its oscillation changes. This is picked up by the electronic detection system, which signals that contact has been made.