Abstract: A one piece fastener which uses spring action to fasten parts together. The fastener has a body which is inserted into a drilled aperture in the parts. An enlarged head on one end of the body is too large to enter the aperture. A spring on the other end of the body is normally too large to enter the aperture but can be retracted to a size to pass through the aperture. A stud has its head connected to the spring and its opposite end in threaded engagement with an internally threaded passage extending through the body of the fastener. Turning of the stud by a special tool applies a torsional force to the spring which retracts it so that the fastener can be applied to or removed from the fastened parts. Alternative embodiments of the invention employ various types of multiple stage springs to enhance the fastening power.

Abstract: A one piece fastener which uses spring action to fasten parts together. The fastener has a body which is inserted into a drilled aperture in the parts. An enlarged head on one end of the body is too large to enter the aperture. A spring on the other end of the body is normally too large to enter the aperture but can be retracted to a size to pass through the aperture. A stud has its head connected to the spring and its opposite end in threaded engagement with an internally threaded passage extending through the body of the fastener. Turning of the stud by a special tool applies a torsional force to the spring which retracts it so that the fastener can be applied to or removed from the fastened parts. Alternative embodiments of the invention employ various types of multiple stage springs to enhance the fastening power.

Abstract: A feeder for power tools to permit rapid installation of fasteners such as screws, nuts or the like. The feeder includes a magazine which receives a supply of fasteners in individual holders for movement through an arcuate, tubular guide to an installation station. Means is provided to move the rotatable fastener driver into engagement with the fastener to install the latter. Subsequent withdrawal of novel spacing pins from the surface of the object results in automatic ejection of the empty fastener holder and movement of a fresh fastener and its holder into proper position for installation. The operation may be continued repeatedly to install a plurality of fasteners with each successive fastener being automatically moved in sequence to the installation position.