Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1994-02-24
1995-07-18
Chilcot, Jr., Richard E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73160, 73829, 73862474, G01N 308
Patent
active
054331161
ABSTRACT:
The prevailing tension in an elongate strand, such as a textile yarn, is instantaneously measured, even at very low levels of tension and at fine incremental changes in tension, by a tension measuring apparatus utilizing a pair of fixed contact arms spaced from one another to define a strand contact line therebetween and an intermediate cantilevered sensing arm disposed at an equal spacing from each fixed contact arm and at a lateral spacing from the stand contact line. The fixed contact arms and the sensing arm are contacted with the strand simultaneously at the same common lateral side of the strand to cause the strand to deflect from the strand contact line at equivalent strand break angles between the respective strand contact points on the fixed contact arms and on the sensing arm. An electrically powered strain gauge, preferably incorporating a Wheatstone bridge circuit, is associated with the sensing arm to generate a continuous electrical output signal varying instantaneously in proportion to the corresponding instantaneous tension prevailing in the strand while in contact with the fixed contact arms and the sensing arm. In one embodiment, the measuring apparatus is contained within a portable hand-held housing for manual placement in contact with a strand whose tension is to be measured, with an auxiliary hand-held housing supplying electrical power to the strain gauge and containing a microprocessor to compute a quantitative tension value from the output signal received from the strain gauge.
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Brochure "EMS Ellipsoid Mini Sensor", HBM, Inc., undated, 2 pages.
Ahlstrom Kevin S.
Bartlett Thomas
Chilcot Jr. Richard E.
Olsen James M.
On Line, Inc.
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