Indirect reading inside caliper

G - Physics – 01 – B

Patent

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33/188

G01B 3/20 (2006.01)

Patent

CA 1108848

TITLE INDIRECT READING INSIDE CALIPER ABSTRACT OF THE DISCLOSURE An improved indirect reading inside caliper which elim- inates the need for a plurality of telescoping inside gauges, the inside caliper comprising an elongated hollow tubular body, a pair of measuring fingers and a bracket slidable on the body, respective manually operated fasteners for the fingers and bracket for holding the same in selected posi- tions on the body, one of the fingers and the bracket fas- tened together so that they slide in unison on the body, a compression spring in the interior of the body operative upon the bracket so as to yieldably urge it toward one end of the body, a manual adjustment associated with the bracket for imparting incremental movement of the one finger relative to the other finger, whereby a range of inside diameters of apertures having size ratios of the order of 1 to 10 may be precisely measured, the body having an axially extending slot therein extending substantially end to end thereof to maximize the maximum distance of travel between the fingers, the slot being V-shaped, each fastener having V-shaped shoulders thereon which engage the slot whereby to circumferentially align said fingers and bracket on the body, the fastener for the bracket having an inner end which extends into the interior of the body for engaging an end of the compression spring, respective protuberances on corresponding outside faces of the fingers, and opposing inside faces on the fingers ground flat so as to minimize the minimum distance between the protuberances.

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