Abstract: Disclosed herein is a structure for incorporating a fuel cell comprising a plurality of layers of unit cells which constitute a fuel cell which are elastically stacked between a fastening member and a base plate, the substantially entire surface of at least one of the end layers being pressed by the surface of a pressing jig wherein the other portion of the jig is rotatably engaged with the surface of the fastening member.

Abstract: A roll stand used for a cold forming apparatus wherein a body of the roll stand has a slant surface on which a pair of non-driving rolls are installed so as to press sheet metal therebetween. The angle between the slant surface of the body and a base on which the body is installed is adjustable by rotating the body, thereby twisting the sheet metal.

Abstract: A roll forming apparatus for forming a flat strip material into a channel shape. This apparatus is composed of a first driving station, a second driving station, and at least two forming stations disposed between the both driving stations. Each driving station respectively contains a pair of driving rolls. The driving rolls of the second driving station is thus constructed to pull the strip at the higher speed than those of the first driving station. Therefore, to the portion of the strip between the first and second driving stations is applied a tensile stress while the strip is sent to the second driving station from the first driving station. At least two forming stations are disposed and respectively contain a pair of forming rolls which are rotated by the moving strip. At the same time, the strip is formed by the forming rolls. As the forming roll used in the present apparatus is a driven roll, maintenance such as adjusting the rotating speed of each station is not necessary.

Abstract: In a method of forming an electric welded steel tube, wherein a hot-rolled sheet is formed into a cylindrical shape, with the central portion thereof being lowered as the forming progresses, and thereafter, subjected to reduction in the circumferential direction of the tube by means of tandem type fin-pass rolls to be finished into the tube, the proper forming condition ranges capable of eliminating occurrence of edge waves in the tube seam edge portion and/or of cambers in the longitudinal direction of the tube by three forming conditions factors including the downhill value D.sub.H (downhill coefficient .eta.) of the hot-rolled sheet, the fin-pass total reduction R of the tandem type fin-pass rolls and the distribution of the fin-pass reduction (the distribution ratio .delta. of the first fin-pass reduction).