(US4445498-A)      The appts. encloses a number of lenses integrally connected with each other. Light conductor cables having light receiving ends are arranged at each focal point of the lenses. A first shaft turns the integrated lenses around the horizontal axis. A support arm rotatably supports the ends of the first shaft.    A second shaft turns the support arm around the vertical axis perpendicular to the horizontal axis. The turning of the first and second shafts is controlled to cause the lenses to face the position of the sun so as to collect sunlight into the light conductor cables. The support arm is provided with a first member having a curved plate formed in the shape of circular arc, and a second member having an inverted saddle-shaped plate or plates. The second member is firmly fixed along the outer surface of the first member. The mass of the support arm is minimised to ensure quick and smooth tracking of the sun's movement. (9pp)f    (EP74016-B)      A support arm (16) for a sunlight concentrating and collecting apparatus, said apparatus enclosing a plurality of lenses (11) integrally connected with each other, light conductor cables having light receiving ends thereof arranged at each focal point of said lenses, a first rotatable shaft (14) for continuously turning said integrated lenses (11) around the horizontal axis, and a second rotatable shaft (17) turning around the vertical axis perpendicular to said horizontal axis, whereby the continuous turning of said first and second shafts (14,17) is controlled to cause said lenses to face the position of the sun so as to collect sunlight into said light conductor cables, characterised in that said support arm (16) is constructed to rotatably support the ends of said first rotatable shaft (14) and is fixed to said second rotatable shaft (17), and said support arm (16) comprises a first member (16a) having a curved plate formed substantially in the shape of a circular arc and a second member having an inverted saddle-shape plate (16b) or plates (16b,16c,16c'), said second member being firmly fixed along the outer surfaces of said first member (16a) with said plate (16b) or plates (16b,16c,16c') lying in the central lateral plane thereof and/or in a corresponding number of planes symmetrical therewith, with said or each of said planes containing the axis of the first rotatable shaft (17), and in that the width of the middle port1on of said first member (16a) is larger than that of the end portions. (10pp)