Hardness tester
AssigneeThe Dow Chemical Company
InventorFrank L. Saunders
Life of this patent
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Abstract
The tester comprises basically a four wheeled carriage, a scale arm containing graduations attached to the carriage in a counterpoised condition about a pivot axis, and a rolling, round fluted cutting tool coupled to the carriage and to the scale arm. The cutting tool, as the carriage is drawn across a test surface, leaves an indented track of the cutting flutes. The width of the track marks is a function of the coating hardness and applied load.
Claims3
In a hardness tester comprising a four wheeled carriage having a scale arm pivotally mounted from one end thereof and supporting a pressure application member in a fixed position with respect to said scale arm whereby said pressure application member contacts a surface to be tested when said wheeled carriage is rolled along said surface, the improvement wherein:
- said pressure application member comprises a ball-like fluted member mounted to rotate along a line which is parallel to any forward movement of said wheeled carriage.
Dependencies are inferred from the claim text.