专利名称：Apparatus for evaluating and testing the
sharpness of points
发明人：MOORE; JOHN D.申请号：US46750674申请日：19740506公开号：US3902358A公开日：19750902
摘要：An instrument for testing the degree of sharpness of points by evaluating thedepth to width ratio of the point and the strength or rigidity of the material of the pointbeing tested comprises a disc having a slot through which the point may be inserted anda sensing head for sensing the depth of penetration of the point through the slot. Thedevice also includes a micrometer scale and spindle for advancing the sensing headtoward the point and measuring the depth of penetration of the point from the slot tothe sensing head. A light in the sensing head indicates when it is contacted by the testpoint.
申请人：THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OFTHE DEPARTMENT OF HEALTH, EDUCATION AND WELFARE
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