PROBLEM TO BE SOLVED: To provide an inexpensive and durable calibrator having a simple configuration for calibrating a fracture strength measuring device for articles such as eggs.SOLUTION: The calibrator 1 for the fracture strength measuring device includes: inside of a cylinder shaped case 10, a counter-pressure unit 13 for applying a counter-pressure force against a pressure from outside by attracting forces of a magnetic body 7 and a permanent magnet 5 and a pressure transmission unit 12 for transmitting the pressure to the counter-pressure unit, and for drastically reducing the counter-pressure by separating the magnetic body 7 and the permanent magnet 5 almost instantaneously by the repelling force accumulated by the pressure when the pressure is over the attracting forces of the magnetic body 7 and the permanent magnet 5. After calibrating the fracture strength measuring device, the calibrator 1 automatically returns to the initial state before the calibration by the attracting forces of the magnetic body 7 and the permanent magnet 5.COPYRIGHT: (C)2010,JPO&INPIT【課題】鶏卵等の物品の破壊強度測定装置の較正にあたって、簡易な構成で、安価に、しかも耐久性の高い較正装置を提供すること。【解決手段】破壊強度測定装置の較正装置1は円筒形のケース10の内部に、外部からの圧力に対して磁性体7と永久磁石5の引力により反圧力を作用させる反圧力部13と、前記圧力を前記反圧力部に伝達し、前記圧力が磁性体7と永久磁石5の引力を超えたときに前記圧力によって蓄勢された反発力により磁性体7と永久磁石5を略瞬時に離反することで前記反圧力を急激に減少させる圧力伝達部12を備えている。破壊強度測定装置の較正後、較正装置1は、磁性体7と永久磁石5の引力により自動的に較正前の初期の状態に回復する。【選択図】図9
