Importance

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Abstract

The apparatus comprises a body (1) provided with three point-contact feelers (12, 13) which open under the action of a spring (19) and close under the action of a lever (20) via a rod (14) and a spacer stop (15). A displacement pick-up (22) and an electronic circuit (25) convert the displacement of the feelers into a measurement signal which is representative of the diameter of the circle which they define. The electronic circuit comprises a minimum memory (31) to memorize the minimum value of the measurement signal, a member (39) for displaying this value (39) and a measurement-initialization switch (32). After the feelers, folded together, have been introduced into the bore, the lever is released, the switch is actuated, and the apparatus is moved in all directions by the operator in order to cause the plane of the feelers to pass in a diametral plane of the bore, this passage generating the minimum value displayed which is representative of the actual diameter of the bore.

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First Claim