Measuring and testing – Hardness – By penetrator or indentor
Patent
1980-05-19
1982-04-27
Myracle, Jerry W.
Measuring and testing
Hardness
By penetrator or indentor
G01N 300
Patent
active
043264093
ABSTRACT:
A probe for measuring the characteristics of soil, rock and the like surrounding a bore hole. The probe includes a hollow cylindrical body surrounded by a resilient membrane. The ends of the membrane are clamped to the cylindrical body, and a pressurized fluid is injected into the cylindrical body to expand the membrane until it contacts the walls of the bore hole. Feeler members which are resiliently biased in a radially outward direction contact a relatively large area of the membrane so that the outward movements of the feeler members are a function of the outward expansion of the membrane. The feeler members are instrumented with strain gauges to measure the expansion of the membrane which, along with measurements of the fluid pressure producing the expansion, provides an indication of the stiffness and strength of the material surrounding the bore hole. Reinforcing fingers surrounding the membrane near its junction with the body reinforce the membrane against relatively strong shear forces existing at the junction.
REFERENCES:
patent: 3442123 (1969-05-01), Broise
patent: 3499320 (1970-03-01), Fox et al.
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