Patent ID: 6338201
Filing Date: 2002-01-15
Classification: G01B

Abstract:
A measuring instrument for checking dimensional accuracy of a surface or a toothing of a workpiece, the instrument comprising a handgrip, an inner cylinder member rigidly connected with the handgrip and extending therefrom to have a free end, the handgrip and the inner member defining a substantially cylindrical space therebetween, an outer cylinder member mounted in said space to be displaceable relative to the inner cylinder member when urged against said workpiece, resilient means providing a bias to resist said relative displacement of the inner and outer cylinder members, a measuring head mounted at said free end of the inner cylinder member, a carrier element mounted in the measuring head and defining a central bore having a bore axis, two diametrically opposite checking elements mounted in the carrier element to be radially movable with respect to said bore axis in response to dimensional variations in a workpiece surface engaged by the checking elements, a movement translation member extending substantially perpendicularly to the checking elements and movable in the bore in response to said radial movement of the checking elements, a measurement sensor mounted in the inner cylinder member remote from said free end thereof and responsive to said movement of the translation member to provide a measurement indicative of said movement of the translation member, and a travel sensor responsive to said relative displacement of the inner and outer cylinder members to provide a measurement indicative of said relative displacement.