Abstract: A pressure relief device for pneumatic conveying lines to serve as a safety device in the event of an explosion or sudden pressure increase within the conveying line. The device includes a pair of semi-cylindrical shells normally joined together by a shear pin or pressure sensitive key which ruptures when excessive pressure in the conveying line exerts excessive force on the shell sections. When the joining device ruptures, the shell sections open up to relieve line pressure. A suitable mounting arrangement is provided including guide bars for the shells, bumpers and spring return arrangement.

Abstract: Elongated strip material is accumulated within a limited accumulation space between two parallel vertical plates in multiple turns within and inner and outer cage, the two cages being substantially cylindrical and formed of horizontal rollers mounted for rotation on fixed pivots such that the strip material is accumulated in a single spiral coil comprising at least two turns with the outer spiral and the inner spiral each being in communication to the exterior of that space through pairs of gripping rollers characterized by the taking out of the inner turns achieved by forming a helicoidal floating turn, the two ends of which are nipped between two gripping rollers in side by side fashion.