Patent ID: 9001405
Filing Date: 2015-04-07
Classification: E06B

Abstract:
1. . A viewing panel unit, comprising: a first panel comprising one or more light transparent regions that are substantially transparent to visible light and one or more light hindering regions which substantially hinder transmission of visible light; a second panel comprising one or more light transparent regions that are substantially transparent to visible light and one or more light hindering regions which substantially hinder transmission of visible light; and an actuator for moving the second panel relative to the first panel in a plane parallel to the plane of the first panel, wherein the actuator comprises: a cam configured such that rotational movement of the cam causes linear movement of said second panel relative to said first panel; a shaft extending through the cam; and an engaging member, wherein: the engaging member provides a non-rotatable connection between the shaft and the cam such that rotation of the shaft in use causes a corresponding rotation of the cam; the engaging member comprises an engaging portion that extends radially outwards from the shaft; and the engaging portion is surrounded by the cam in all directions parallel to the axis of the shaft and in all directions perpendicular to the axis of the shaft.