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US 4,245,496 AGranted
Portable material hardness tester
OwnerFred Napetschniginventor
Life of this patent
Estimating the term…
Abstract
A portable hardness tester including a surface sensing member yieldably mounted for engagement with the surface of material to be tested and a penetrator yieldably mounted adjacent the sensing member for joint contact with the surface; manually applied means for applying minor and major penetrating forces on the penetrator; and electronic means for sensing the differential movement between the penetrator and surface sensing member and translating such differential movement into a hardness indication.
Claims17
A portable material hardness tester comprising:
- a surface sensing member yieldably mounted for engagement with the surface of material to be tested;
- a penetrator yieldably mounted adjacent said member for joint contact with said surface;
- said member being positioned as a protective shield for said penetrator and being mounted for joint and differential displacement therewith when pressed against said surface;
- said member including a sleeve surrounding said penetrator and having a distal, surface-engaging, end;
- said penetrator having a surface-engaging tip;
- means for placing a first predetermined surface penetrating force on said penetrator;
- means placing a second and larger predetermined surface penetrating force on said penetrator;
- means sensing with respect to said member the differential movement of said penetrator in response to said first and second forces;
- said member being mounted for displacement by said surface for engagement of said tip with said surface, and said member being mounted to maintain a reference contact with said surface upon subsequent displacements of said penetrator into said surface in response to said first and second forces;
- a housing having a face engageable with said surface, with said member and penetrator being mounted for reciprocation in said housing and normally projecting from said face;
- and
- means translating said differential movement into a hardness indication.
9 more elements
A material hardness tester comprising:
- a surface sensing member yieldably mounted for engagement with the surface of material to be tested;
- a penetrator movably mounted adjacent said member for engagement with said surface for joint contact with said surface;
- a first spring connected to said penetrator and providing a first predetermined surface penetrating force thereon;
- a second spring and means storing energy therein connected to place a second and larger predetermined surface penetrating force on said penetrator;
- means sensing with respect to said member the differential movement of said penetrator in response to said first and second forces and generating a first electric signal as a function of said differential movement;
- means sensing a variation from norm of the magnitude of said first force and generating a second electric signal;
- and
- means translating said first and second electric signals into a force compensated hardness indication.
5 more elements
Dependencies are inferred from the claim text.