Patent attributes
The concrete insert may be positioned in concrete structures for attachment rods or other structural fasteners. A shaft may have a head to form a projecting edge at a first end and a hole at a second end. There may be slots formed in an external surface of the shaft oriented parallel to the shaft longitudinal axis. The external surface may have multiple retaining flats positioned intermediate the slots and approximately parallel to the slots. The retaining flats may not extend to the second end. A plate groove may be circumferentially formed in the external surface intermediate the first end and the second end. A plate may have an aperture that may be the form of a lateral cross section of the shaft, and may have projections to engage the slots or the flats. A spring may be placed on the shaft between the head and the plate.
