Abstract: A device for gaining solar energy comprises a integral unit with a casing (10 . . . 13). The casing comprises reflection means (20) with a hollow reflector surface (25) and is closed off by refraction means (30) with an entry surface (35) for entering sunlight. The refraction means and reflection means are each rotatably arranged around a rotation axis (71, 72) and their orientation relative to each other is continuously adjusted to the current position of the sun in the sky using positioning means provided for that purpose. The casing comprises a number of dustproof, but nevertheless ventilating chambers. The first chamber (100) is situated between the refraction means (30) and the reflection means (20) and comprises energy-conversion means (40) at least near to the focal point of the reflector surface (25).

Abstract: The invention relates to a device (10) for converting solar energy, comprising a solar radiation capturing unit (11) comprising at least one lens having a entry surface (11a) for the incident solar radiation and an exit surface (11b) for emitting the solar radiation in refracted form to a solar radiation concentrating unit (12) comprising a reflector surface (12a) for reflecting the solar radiation incident on the reflector surface (12a) from the exit surface of the lens (11b) to at least one target area (13) of the solar radiation concentrating unit (12). The device (10) comprises positioning means (14) for orienting the solar radiation capturing unit (11) and the solar radiation concentrating unit (12) with respect to each other through rotation about at least one axis (11?) perpendicular to a plane formed by the lens.

Abstract: The invention relates to a device (10) for converting solar energy, comprising a solar radiation capturing unit (11) comprising at least one lens having a entry surface (11a) for the incident solar radiation and an exit surf ace (11b) for emitting the solar radiation in refracted form to a solar radiation concentrating unit (12) comprising a reflector surface (12a) for reflecting the solar radiation incident on the reflector surface (12a) from the exit surface of the lens (11b) to at least one target area (13) of the solar radiation concentrating unit (12). The device (10) comprises positioning means (14) for orienting the solar radiation capturing unit (11) and the solar radiation concentrating unit (12) with respect to each other through rotation about at least one axis (11?) perpendicular to a plane formed by the lens.

Abstract: A facing cutter for making annular holes which includes a substantially cylindrical jacket having inner and outer peripheries and a lower end. A plurality of axial teeth are spaced circumferentially at the lower end of the jacket with each tooth having an inner and outer cutting edge which extends helically along the jacket. The teeth are of alternately different design, with a different angle formed by the intersection of the inner and outer cutting edges on every other tooth and the axial length of the alternate teeth being different. An initial tooth cuts the central portion of a groove to be formed to a deeper level than an alternate tooth that cuts the side portions of the groove to be formed.

Abstract: A facing cutter for making annular holes which includes a substantially cylindrical jacket having inner and outer peripheries and a lower end. A plurality of axial teeth are spaced circumferentially at the lower end of the jacket with each tooth having an inner and outer cutting edge which extends helically along the jacket. The teeth are of alternately different design, with a different angle formed by the intersection of the inner and outer cutting edges on every other tooth and the axial length of the alternate teeth being different. An initial tooth cuts the central portion of a groove to be formed to a deeper level than an alternate tooth that cuts the side portions of the groove to be formed.