Flachglass Aktiengesellschaft

Flachglas Aktiengesellschaft

Hans-Cristoph Neuendorf

Rudolf Eckardt

Lutz Bartelsen

An electrically heatable self-defrosting windshield has a transparent panel, two low-resistance groups of wires embedded in the panel and defining a primary zone requiring rapid heating, and at least one high-resistance group of wires embedded in the panel and defining a secondary zone adjacent the primary zone and not requiring rapid heating. A switch connected to the wire groups and to an electric power source is movable between a fast-heat position connecting the two low-resistance groups in parallel with each other across the source and effectively disconnecting the high-resistance wires, and a slow-heat position connecting the two low-resistance groups in series with each other and jointly in parallel with the high-resistance groups across the source. The total resistance of the groups in the fast-heat position is generally the same as in the slow-heat position. Each wire group has a pair of transverse buses flanking the respective zone and connected to the switch means and the wires of each group extend longitudinally and generally parallel to one other between the respective buses.

Electric self-defrosting windshield heating arrangement providing fast

A method of grinding glass sheets whose edges are polygons that are not symmetrical about a point is carried out in an apparatus having a supply station for supporting a stack of such sheets with all of the sheets in the stack in vertical registration, a grinding station adjacent the supply station having a grinding table rotatable about an upright grinding axis and adapted to support the sheets during grinding, a template secured to the grinding table, and a pair of grinders in the grinding station radially engageable with the edges of the sheet on its grinding table and radially displaceable by the template. The method of the invention comprises the steps of transporting the sheets one at a time from the stack in the supply station to the grinding station, simultaneously engaging the grinders with the sheet in the grinding station while rotating this grinding table with its template and the sheet on the table through 180.degree. to grind the edges of the sheet on the table, so that each such grinding operation displaces the template through 180.degree. about the axis. Finally every other sheet is rotated while being transported from the supply station to the grinding station through 180.degree. about an intermediate vertical axis.

Method of and apparatus for grinding the edges of glass sheets

An apparatus for grinding the edges of glass sheets comprises a device for supporting a stack of such sheets at a supply station, a table adjacent this supply station and dimensioned to support one of the sheets with its sheet edge overhanging the table, a transport carriage displaceable between the supply station and the table, and lifters on the carriage for picking up a sheet in the supply station, transporting the picked-up sheet to above the table, and for depositing the picked-up sheet on the table. The apparatus is provided with horizontally displaceable pushers on the carriage engageable with the sheet edge of a sheet on the table for horizontally displacing the sheet on the table into a predetermined position relative to the template edge. In addition the apparatus has a template underneath the table having a template edge of the shape to be imparted to the sheet on the table and a grinder displaceable around the sheet in contact with the template edge for grinding the sheet edge of a sheet on the table in accordance with the template edge.

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Wesel, Germany

Hans-Cristoph Neuendorf