Abstract: The invention relates to a fastening element for two-dimensional fiber material comprising a basic element and pin-shaped profile elements, which protrude from the basic element in order to penetrate the fiber material. Provision is made for the profile elements to be deformable in order to form retaining heads for the fiber material. The invention further relates to a method for fastening two-dimensional fiber material which can be carried out with a fastening element of such type. By the method in accordance with the invention a cold micro-riveting can be achieved.

Abstract: A toy construction set has interconnectable objects, each with multiple faces. Some faces have a connector, while others lack a connector but may have a fibrous or pierceable material. The connector includes a pair of concentrically nested hubs. The two hubs have spiral prongs that spiral in opposite directions. A manually operable link connected between the two hubs can relatively rotate them in opposite directions. The play activity proceeds by adjoining a pair of the objects with a prominent, connector-bearing face of one of the pair touching a prominent connector-free face of the other one of the pair. The player will counter-rotate the hubs in the connector of the prominent connector-bearing face to embed their spiral prongs in the fibrous or pierceable material of the prominent connector-free face.

Abstract: A fastener which operates to provide retractably extendable fastener elements which allow for attachment and detachment of the fastener to fastenable materials.