Patent ID: 6976387
Filing Date: 2005-12-20
Classification: G01N

Abstract:
1. A hardness measuring device comprising: a penetration body that penetrates a workpiece along a penetration vector during a measuring process; a housing, the housing comprises a guide track means for guiding the penetration body, the penetration body being moveable along the guide track means between a rest position and a measuring position, and the housing further comprises a mechanical drive that is in engagement with the penetration body at least in the rest position and the mechanical drive determines either a test force or a test impulse during a measuring process; and an electronic control circuit that controls the measuring process and that calculates a hardness value from the movement and/or the penetration behavior into the workpiece of the penetration body, wherein the hardness measuring device comprises an acceleration sensor, the acceleration sensor produces an angular signal, depending on the angle that the penetration vector makes with a local gravitational vector and the angular signal is input into the control circuit, the control circuit calculates a correction value for a precise hardness measurement, taking into consideration a known mass of the penetration body and of the parts connected thereto.