| 摘要 |
A device for inspecting bores comprises a plug gauge (2). A shank (3) of the plug gauge (2) mounts two limbs (7, 7') that mount sensing pins (15, 15') housed in openings (14) in the plug gauge (2) and resiliently bias the pins outwardly. A needle (10), mounted for axial movement in the plug gauge (2), has a pointed region at one end for contacting inner edges (9, 9') of the limbs (7, 7') and a surface (12) at its other end for contact with a measuring pin of an indicator device (not shown). In use, the plug gauge (2) is inserted into a bore. (The plug gauge (2) may be of the same diameter as a go plug gauge for the bore whereby it functions as a go plug gauge). The plug gauge (2) is displaced and/or rotated and the pins (15, 15') move radially to follow the outline of the bore. Radial movement of the pins is converted to axial movement of the needle (10) by cooperation of the edges (9, 9') and the pointed end region of the needle, and is displayed on the indicator device. The number of sensing pins can be more than or less than two. In a modification (FIG. 5), the limbs (7, 7') and the pointed end region of the needle (10) are omitted and a pivotable element (19) converts radial movement of a sensing pin (15B) to axial movement of the needle.
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