SELF-ALIGNING INTERNAL CALLIPERS Russian patent published in 2014 - IPC G01B5/12 

FIELD: measurement equipment.

SUBSTANCE: device comprises a body with a unit of fixation, a spring-loaded pusher, placed in the inner cavity of the body coaxially to the latter with the possibility of reciprocal motion and interaction with an indicator by means of an indicator head, two bearing levers installed in parallel relative to each other, the first of which is rigidly fixed on the pusher, equipped with tips at the ends placed coaxially to each other, a handle fixed on the pusher and placed as capable of displacement in the longitudinal slot, arranged in the body, besides, the second of the bearing levers is equipped with a slider, installed as capable of displacement along the outer surface of the body and fixation, at the same time the body is equipped with a fixed thrust end, interacting with a spring, pressing the pusher towards the indicator head, and an additional slot, arranged opposite to the first one, for placement of the first bearing lever, and tips are arranged in the form of flat plates, placed in the plane parallel to the central axis, with the possibility of interaction with their side surface of the measured hole, besides, the metering tip of the first bearing lever is equipped with one rounding radius, the centre of which is arranged on the axis of the tips, and the metering tip of the second bearing lever is equipped with two equal rounding radii, centres of which are on the axis, perpendicular to the axis of the tips and at the identical distance at both sides from it, and the plane tangent to the specified rounding radii.

EFFECT: design of self-aligning internal callipers will make it possible to expand its possibilities, to increase accuracy of measurement and its convenience in operation without application of adjustment rings.

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