Abstract: An adjustable platform support mechanism for a keyboard includes a platform and a connecting assembly for the platform. The connecting assembly is attached to the platform by means of first and second pivotal connecting arms. The quadrilateral formed by connecting the pivots is in all instances a non-parallelogram. Thereby the platform, when moved from an extended position to a storage position, is pivoted upwardly in order to increase the space available in the kneehole underneath the desk. The shelf also features an adjustable tilt mechanism associated with keyboard platform support bracket so that the operator will be able to adjust the platform to any one of a number of tilt positions.

Abstract: An adjustable platform support mechanism for a keyboard includes a platform and a connecting assembly for the platform. The connecting assembly is attached to the platform by means of first and second pivotal connecting arms. The quadrilateral formed by connecting the pivots is in all instances a non-parallelogram. Thereby the platform, when moved from an extended position to a storage position, is pivoted upwardly in order to increase the space available in the kneehole underneath the desk. The shelf also features an adjustable tilt mechanism associated with keyboard platform support bracket so that the operator will be able to adjust the platform to any one of a number of tilt positions.

Abstract: An adjustable platform support mechanism for a keyboard includes a platform and a connecting assembly for the platform. The connecting assembly is attached to the platform by means of first and second pivotal connecting arms. The quadrilateral formed by connecting the pivots is in all instances a non-parallelogram. Thereby the platform, when moved from an extended position to a storage position, is pivoted upwardly in order to increase the space available in the kneehole underneath the desk. The shelf also features an adjustable tilt mechanism associated with keyboard platform support bracket so that the operator will be able to adjust the platform to any one of a number of tilt positions.

Abstract: A prefabricated door light unit comprises a rectangular ringlike frame units which project into the window opening from opposites thereof and are fixably mountable therein. The frame units define a window opening therethrough and have cooperating means for permitting the units to slidably telescope for accommodating the variable thickness of the door. The outer frame unit includes a tubular support wall structure integrally fixed to a peripheral flange wall and projecting substantially transversely therefrom into the door opening. The support wall structure includes a peripheral extension section extending away from a S-shaped cross section in a direction toward the inner frame unit. A window pane or door structure is hingedly connected to swing between open and closed positions with respect to the window opening adjacent one side of the peripheral extension section.

Abstract: A door light having exterior and interior rectangular frames which are inserted into the door opening from opposite sides thereof. The exterior frame is molded of a plastics material as an integral, one-piece element having a rearwardly projecting tubular portion which slidably telescopes into a tubular portion defined by the interior frame. The interior and exterior frames slidably telescope until the flanges thereof abut the respective door faces to accommodate variable door widths. The exterior frame has a downwardly and forwardly sloped upper surface along the lower horizontal frame element which, in cooperation with an integral rear wall located behind the inner sash, causes all drainage along the sloped upper surface. Guide tracks are secured along the vertical sides of the frame and define outer and inner channels, with a top sash being stationarily fixed within the upper end of the outer channel.