Geometrical instruments – Gauge – Movable contact probe – per se
Patent
1996-02-20
1997-09-23
Will, Thomas B.
Geometrical instruments
Gauge
Movable contact probe, per se
33558, 33561, G01B 5012
Patent
active
056691521
ABSTRACT:
A touch trigger probe for a coordinate measuring machine or machine tool has a stylus, which is biased into a rest position. The stylus has two independent supports, provided within a housing. A first support comprises a skirt of a stylus holder which is axially constrained on a surface of the housing. The second support comprises a kinematic arrangement of cylinders and balls, together with a planar spring, which together provide lateral constraint. The first support is biased by a much lighter force than the second support, so that its friction is very low. This reduces the lobing and hystersis of the stylus movement, and thereby increases the accuracy of the probe. The stylus movement first takes up a clearance between the first support and an abutment surface of the housing and then disengages the kinematic arrangement of the second support upon further stylus movement.
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Renishaw plc
Will Thomas B.
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