Abstract: A fastener self-directed to change form and direction in order to conform to a desired fastening trajectory.

Abstract: Described is a fastener having a longitudinal shank designed with a central cross-member; two arms, one at each end of the cross-member; each arm having a forward vane and a rearward vane, the vanes extending longitudinally along at least most of the length of the shank. A flattened head is at one end of the shank, and a pointed end at the other. The head may be notched for ease in collating the fasteners.

Abstract: A nail-shaped fastening element having a stem, and a head (3, 13, 23, 33) provided at one end of the stem and projecting radially beyond the stem with the stem tapering at its another, free end toward a tip (5, 15, 25, 35) and having a spherical, first section (1, 11, 21, 31) extending from the tip (5, 15, 25, 35) in a direction toward the head (3, 13, 23, 33), and a second conical section (2, 12, 22, 32) adjoining the first section (1, 11, 21, 31) and having a length (L2, L12, L22, L32) smaller than a length (L1, L11, L21, L31) of the first section (1, 11, 21, 31).

Abstract: The invention relates to a method, a tool and a punch (1) for joining a sunken punch to one or more metal plates (2, 3). According to said method, in a single step, the plate or plates are deep-drawn into a deep-draw opening (5) of a female mould or then possibly crushed so that the displaced material fixes and joins the punch (1) to the plate or plates in a positive fit. The punch (1) may present further possibilities for engagement for creating a connection to other components.

Abstract: A pinch clamp for clamping or drawing together building materials is disclosed having an elongated connecting bar having first and second ends, and first and second pyramidal prongs. Each prong has a triangular base, a distal tip, an inner flat tapered side and two outer sides defining a wedge shape, the base of the first prong connected at the base to the first end of the connecting bar the base of the second prong connected at the base to the second end of the connecting bar with the inner tapered sides facing each other.