Abstract: The solar collector comprises a plurality of direction adjustable elongated parabolic reflectors arranged side by side. Along the focus of the reflectors are tubes for a heat collecting medium. The tubes are to be connected to heat exchangers or the like.Each reflector consists of reflector wall portions movably connected to each other and operable from an open parabolic reflector position to a non-reflector position entirely enclosing the tubes, and forming a relatively flat structure resembling a venetian blind slat.

Abstract: PCT No. PCT/SE78/00017 Sec. 371 Date Mar. 19, 1979 Sec. 102(e) Date Mar. 13, 1979 PCT Filed July 11, 1978 PCT Pub. No. WO79/00047 PCT Pub. Date Feb. 8, 1979The constructional member is intended for use in installations of falce ceilings, walls, doors and windows in buildings, and is formed as a substantially U-shaped rail with a web portion (1) and two leg portions (2, 3). Since one leg portion (3) is shapable onto the web portion (1), the rail can be first placed round the member (15) which is to be erected, e.g. a partition wall, and thereafter the constructional member can be fixed in place with the help of the snap-on leg portion (3). The middle portion (5, 7, 8) of the web portion (1) has channels which enable exact fitting of the constructional member either round a building member (17) or against another constructional member, e.g. at corners or edge surfaces.