Abstract: This invention is directed to a window shade assembly including a telescoping roller and a shade mounted on the roller which may be quickly and easily adjusted to conform to the size of the window opening into which the assembly is to be mounted. The shade at one end includes a first portion secured to the larger roller section and a second portion wrapped around the projecting end of the smaller roller section a number of times sufficient to form a tube having an outside diameter approximately equal to the outside diameter of the first roller section. The projecting smaller roller section is freely axially slidable within the tube. In accordance with a preferred form of the invention disclosed, the shade includes at the side adjacent the smaller roller section a plurality of spaced hand-strip lines, preferably invisible, extending from end-to-end parallel to the shade edge which permit hand-stripping of discrete widths of the shade while the shade is rolled on the roller.

Abstract: This invention is directed to a window shade whose width can be decreased, without cutting instruments, to conform to the size of the window opening into which the shade is to be mounted. The window shade includes a roller and a shade secured to the roller having at one or both edges a plurality of spaced strip lines, preferably invisible, extending from end-to-end parallel to the shade edges. The strip lines permit hand-stripping of discrete widths of the shade while the shade is rolled on the roller. The roller includes substantially coincident with the strip lines of the shade a plurality of longitudinally spaced, circumferentially extending strip lines permitting removal of a corresponding discrete length of the roller. In accordance with the invention disclosed, the shade includes a plurality of integral tabs at the hem end of the shade whose edges generally coincide with the strip lines to facilitate the stripping of discrete widths of the shade.

Abstract: A gate-controlled bidirectional switching device has two main terminals on opposite major surfaces of the device. A single gate terminal located adjacent one of the main terminals on one of the major surfaces receives a signal biased with respect to said one terminal to trigger the device into conduction. The device conducts current in either direction through the main terminals, depending on the polarity of an applied bias potential across the main terminals. By controlling the resistivities or the widths of two base regions in the device with respect to each other, a trigger current for switching the device from a nonconductive state to conduct current in the one direction is adjusted with respect to that required to switch the device to conduct current in the other direction.