Abstract: A scraper blade assembly for use in a central chain scraper conveyor, especially in a double central chain scraper conveyor, includes a lower and an upper blade part forming respective channels that complement each other at a parting plane between the blade parts into openings for receiving transversely spaced portions of respective horizontal links of the chains. The blade parts have overlapping portions one of which extends across the parting plane and is received in a correspondingly configurated recess juxtaposed with the other overlapping portion. The overlapping portions are provided with aligned holes at least one of which is elongated in direction normal to the parting plane, and bolts extend through these holes parallel to the advancement direction of the conveyor to connect the blade parts to one another.

Abstract: A chain coupler link or a chain lock made preferably of round steel is assembled of two complementary J- or U-shaped link halves each having two arms of different lengths. The ends of respective arms are formed with interlockable tongue-and-groove joints and the facing wall portions of the longer arms are formed with arresting grooves directed transversely to the center plane of symmetry of the link. An arresting nose piece is insertable between the wall portions so that the projecting noses engage with respective arresting recesses. A sloping bore passes through the link halves and through the arresting piece to receive a safety pin. To ensure an unobstructed insertion of the safety pin into the sloping bore, the noses and the corresponding arresting recesses have different cross sections, so that the arresting pin is insertable between the link halves in a single orientation only.

Abstract: A connecting element for connecting two link chain strands comprises a central oval chain member, and two coupling links each having an axis and two axial ends and connected to the chain member and one of the link chain strands. Each coupling link is composed of a U-shaped suspension part and a W-shaped base part whose legs and projections interdigitate with one another in a comb-like manner. A coupling bolt extends through the legs and projections so as to connect the base part with the suspension part of each coupling link. Grooves of the base part which are bounded by the projections, extend from a front end face of the base part through the region of the coupling bolt and further up to an axis of a through bore through which latter the chain member extends. Side walls bounding these grooves and located adjacent to a longitudinal axis of the chain link diverge outwardly in the transverse direction in the region outside of the coupling bolt and near the through bore.