Swivel anchor with prevention of anchor arm retraction

1. A high strength anchor comprised of anchoring arms which are configured for insertion through an aperture in a substrate while the anchoring arms are in a minimal configuration and which are expandable behind the substrate for anchoring engagement to a distal surface of the substrate, the anchor having at least two pivotally attached elongated anchoring arms with the arms being swivelable relative to each other in a single plane from the minimal configuration wherein the anchoring arms are coextensive to an expanded anchoring engagement position wherein the anchoring arms cross each other through a point of pivotal attachment, wherein the anchor comprises a structural element either integral with the anchor arms or as an element separate from the anchor arms which retards unintended retraction of swivelling expandable movement of the anchoring arms from the minimal configuration to the expanded anchoring engagement position, wherein a first of the anchoring arms or structural element comprises at least two depressions in a surface thereof facing a second of the anchoring arms and wherein the second of the anchoring arms or structural element comprises an extending tooth member extending toward the depressions and engaged therewith at an angle whereby the swiveling toward the expanding anchoring engagement position is permitted but retraction movement is retarded.

2. The high strength anchor of claim 1 , wherein the tooth member extends from the structural element separated from the second of the anchoring arms but fixedly engaged therewith.