Abstract: A fastening tool inserts a self-penetrating fastener into workpieces and then sets the fastener in a manner similar to a blind riveting tool. The fastener has a stem, a mandrel connected to the stem, and a body surrounding a portion of the stem adjacent the mandrel. The body has an enlarged head at the end opposite the mandrel. The mandrel has a point for penetrating the workpieces. The fastening tool applies a force to the fastener, causing it to penetrate the workpiece. The fastening tool then pulls the stem in a direction away from the workpiece while restraining the body against movement relative to the workpiece. The mandrel expands the lower portion of the body radially as it is pulled into contact with the body, forming a second or blind head on the side of the workpiece opposite the fastening tool.

Abstract: The sandal has a laminated sole comprising an inner sole and an outer sole, both formed of flexible cellular material. The inner sole is thicker, less dense and softer than the outer sole. A single retaining strap is employed which also is made of flexible and elastic cellular material and which has on its broad outer faces elastic stretch fabric material. The strap is in a figure eight configuration with its forward closed loop passing through a hole in the inner sole and out to the edge thereof through a slot in the under surface of the inner sole. The rear loop of the strap, which is formed by the free ends thereof, lies in a slot in the under surface of the inner sole just forward of the heel region of the sandal. The ends of the straps are affixed to the inner sole to hold them in place.