Importance

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Abstract

This invention pertains to an improvement in box joint tools and particularly for reducing play resulting from wear of the members forming the box joint. The box joint is formed in the usual manner. This improved joint is used when or where wear develops or may be utilized with new tools at the time of assembly. A first portion outer member of the box joint is machined to provide a counterbore and an enlarged bore in this member portion. A counterbore is also formed in the second outer member portion and extends to about one thirty second of an inch from a central jaw tongue portion. This counterbore provides a flexure portion with a smaller bore axially coincidental with the axis of the central portion. A pivot pin bushing has a threaded bore and is sized to be a press fit in the formed counterbore and enlarged bore of the first outer member. This bushing is mounted in the first outer member and the shank portion extends into the tongue portion of the central jaw. This extending portion of the bushing provides the pivot for this jaw portion. A securing screw is mounted in the second outer member and is tightened in the threaded portion of the bushing to bring the member portions of the box joint into a sliding relationship absent unwanted play. The box joint is shown in certain embodiments with a thin washer under the head of the cap screw. This washer is of metal or of plastic such as Teflon.

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First Claim