Importance

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Abstract

The retention device for retaining a fastener comprises an outer tubular shaft slidably disposed upon an inner tubular shaft. Extending from the distal end of the inner tubular shaft is a plurality of resilient gripping members, each having an arcuated portion protruding outwardly from the cylindrical axis of the inner tubular shaft. The outer tubular shaft, having a conically tapered inner bore, is longitudinally slid along the inner tubular shaft to press inwardly the arcuated portions so that the gripping members grasp a fastener at the distal ends thereof. The outer tubular shaft can be internally threaded to provide varying strength for retaining or releasing the fastener. A restraining resilient member is provided to prevent the retention device from falling off from the fastening tool by engaging an annular flange disposed upon the shank of the fastening tool. Another retention device, comprising two independent sets of gripping members for use separately in combination with two co-operating outer tubular shafts, is employed to provide multiple contact points at the head and shank of the fastener for better alignment and improved holding capability.

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First Claim