Patents Assigned to Girlock Limited of Belmore
  • Hardness tester
    Patent number: 4040291
    Abstract: A method of measuring surface hardness combining the techniques of Brinell Hardness testing and air-gauging by providing a hard penetrator member having in it a passage and apertures through which air under pressure is passed. The hardness of a work piece is measured by measuring the effect on air pressure caused by occlusion of the apertures as the penetrator is pressed into a specimen of which the hardness is to be measured.
    Type: Grant
    Filed: February 10, 1976
    Date of Patent: August 9, 1977
    Assignee: Girlock Limited of Belmore
    Inventor: Bernard John Ince