Geometrical instruments – Area integrators – Electrical
Patent
1982-06-30
1984-07-31
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
33 1M, 33172E, G01B 702
Patent
active
044621620
ABSTRACT:
A probe for measuring dimensions of a workpiece in coordinate positioning apparatus, comprises a base (20), a stylus holder (21) having an axis (21A), an intermediate member (22, 30) having a fixed region (22A) connected to said base and a free region (22B) connected to said holder, said intermediate member being resilient so as to be responsive to a displacing force (FW) acting on said holder in the sense tending to tilt or axially move said holder relative to said base, and sensing means (30) connected between said free region and said base for sensing the occurence of a said displacing force.
The intermediate member is only sufficiently resilient to make possible said sensing. To cope also with the requirement of the probe over-running the sensing position there is provided a spring (25) connected in a state of partial deflection between said holder and said free end to urge the holder into engagement therewith with a spring force corresponding to said partial deflection, the holder being tiltably and axially displaceable from said engagement in opposition to said spring and being returnable to said engagement by said spring when said displacing force ceases, and wherein said spring is of lesser stiffness than said intermediate member.
REFERENCES:
patent: 3945124 (1976-03-01), Jacoby
patent: 4078314 (1978-03-01), McMurtry
patent: 4136458 (1979-01-01), Bell et al.
patent: 4153998 (1979-05-01), McMurtry
patent: 4279080 (1981-07-01), Nakaya
Martin, Jr. William D.
Renishaw Electrical Limited
Rolls-Royce Limited
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