Patent ID: 9003673
Filing Date: 2015-04-14
Classification: G01B

Abstract:
1. A depth testing device for testing depth of a screw drive, the drive being defined in the top end of the screw, the drive having a depth recorded as H, the depth testing device comprising: a supporting assembly for supporting the screw; a calibrating assembly comprising a calibrating element, the calibrating element contacting and pressing on the top end of the screw and, the calibrating element having a thickness recording as H a testing assembly comprising a testing device and a testing probe, the testing device comprising a testing member and a testing pole stretching in or out of the testing member, one end of the testing probe being received in the testing pole, the testing assembly moving towards the calibrating element until the other end of the testing probe resisting the calibrating element, the reading of the testing member being reset to zero, then the calibrating element being removed to separate from the screw, the testing device continuing to move towards the screw until the other end of the testing probe inserting into the drive of the screw completely, recording the reading of the testing member as H