G - Physics
01
N
73/91
G01N 3/44 (2006.01)
Patent
CA 1071889
ABSTRACT OF THE DISCLOSURE This invention provides an apparatus for measuring the hardness of a sample of rubber. The apparatus comprises a sample support surface, an indentor comprising a plunger terminating in a standard probe and having its axis perpendicular to the support surface, a housing within which the plunger is a sliding fit, means for introducing gas under pressure between the bearing surfaces of the plunger and the housing, a foot which provides a datum surface that is flat and normal to the indentor axis, the foot being such as to allow free passage of the probe therethrough, means for lowering the foot into contact with a sample, means for lowering the probe into contact with the sample such that the indentor is free standing on the sample and exerts on the sample a determined contact force for a first determined period of time, means applicable to the indentor to increase the weight on the sample by the indenting force increment for a second deter- mined period of time, and means to indicate the downward move- ment of the indentor during the second determined period of time. The apparatus of this invention avoids the need to provide vibration, as in previous prior art devices.
273996
Appleford David D.
Warwick Paul S.
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