Geometrical instruments – Gauge – Movable contact probe – per se
Patent
1991-01-22
1993-05-25
Will, Thomas B.
Geometrical instruments
Gauge
Movable contact probe, per se
33561, 33558, G01B 520
Patent
active
052128733
ABSTRACT:
A probe for use on a coordinate positioning machine has a stylus supporting assembly (15), which supports a stylus (14) for three dimensional movement relative to the probe housing (10). The stylus supporting assembly (15) comprises a first member (16) mounted on the housing (10) and having a first plane surface (18). A second member (20) has a second plane surface (22) which is retained against the first plane surface (18) by magnets (24). The second member (20) may move in all directions in the XY plane relative to the first member (16) on an air bearing (26), and rotation of the second member (20) relative to the first member (16) is prevented by a spring bellows (30). The stylus (14) is fixedly connected to a third member (42) having plane surfaces (52A,B), which are retained against corresponding surfaces (50A,B) provided on the second member (20) by magnets (56), and for movement relative to the second member (20) in the Z direction on air bearings (48). The second and third members (20,42) may be provided in a light but stiff structure to lower the inertia of the stylus supporting assembly (15) and such a structure may for example be a honeycomb material. Movement of the stylus (14) in each of the X,Y,Z, directions is transduced by a series of transducers (62A,B;64A,B;66A,B).
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patent: 4530159 (1985-07-01), Ernst
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patent: 4899456 (1990-02-01), Morita et al.
patent: 4942671 (1990-07-01), Enderle et al.
Renishaw plc
Will Thomas B.
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