Apparatus for measuring the hardness of rubber

Details Apparatus for measuring the hardness of rubber Apparatus for measuring the hardness of rubber

1976-12-16

1978-09-05

Ciarlante, Anthony V.

Measuring and testing

Hardness

By penetrator or indentor

73 82, G01N 342, G01N 348

Patent

active

041110390

ABSTRACT:
In apparatus for measuring the hardness of rubber of the type wherein a needle is urged against the surface of a rubber sample and the degree of penetration of the needle is measured there are provided a coil spring, a lever for causing the needle to compress the spring and a releasable latch for holding the spring in the compressed state. When the spring is released it urges the needle against the rubber sample under a prescribed speed and force. The displacement of the needle is detected by an electric transducer and its output signal is processed by an electric circuit including a peak detector and an analogue-digital converter for digitally displaying the displacement. When the spring is released a switch is operated to start the analogue-digital converter for determining the starting point of the time necessary to measure the displacement by using the time as a parameter.

REFERENCES:
patent: 1581839 (1926-04-01), Dahlqvist
patent: 3421364 (1969-01-01), Moneypenny et al.
patent: 3498114 (1970-03-01), Garber et al.

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