Method for measuring hardness of rubber and plastics and a hardn

Details Method for measuring hardness of rubber and plastics and a hardn Method for measuring hardness of rubber and plastics and a hardn

1982-06-16

1984-05-29

Swisher, S. Clement

Measuring and testing

Hardness

By penetrator or indentor

374142, G01N 342

Patent

active

044507135

ABSTRACT:
The invention relates to a method for measuring the hardness of rubber, plastics, etc. and a hardness tester for use therein, characterized in that a feeler of the hardness tester is brought into contact with the surface of a test material, the amount of displacement of the feeler is converted into electric signals, the variation of hardness from the maximum value directly after the testing to the stabilized value after the lapse of a preset space of time is measured, and the temperature of the test material is taken synchronously with the hardness testing. The hardness tester comprises a hardness sensor for detecting the displacement of the feeler of the hardness tester in terms of a variation in voltage, an evaluation unit for converting the variation in voltage into a digital signal for hardness, a maximum value detecting circuit connected with the evaluation unit, a time presetting switch part, a timer, and a display part for making a digital display of the variation from the maximum value of hardness to the stabilized value of hardness after the lapse of a preset space of time, thereby enabling an operator to detect with precision the variation of hardness of the test material.

REFERENCES:
patent: 3576127 (1971-04-01), Weitzel
patent: 4111039 (1978-09-01), Yamawaki et al.
patent: 4331026 (1982-05-01), Howard
patent: 4383450 (1983-05-01), Pringiers

Affiliated with

Also associated with

Rating

Method for measuring hardness of rubber and plastics and a hardn does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for measuring hardness of rubber and plastics and a hardn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for measuring hardness of rubber and plastics and a hardn will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1391652