Abstract: There is disclosed a viewing panel unit, comprising: a first panel and a second panel; a drive mechanism for moving the first panel relative to the second panel; and an abutment member mounted so as to have a fixed spatial relationship relative to the second panel, wherein: the first panel comprises a coupling member; the drive mechanism comprises a drive member configured to engage with the coupling member such that rotation of the drive member imparts a linear motion to the first panel via the coupling member; and the drive mechanism is configured such that a first impact surface of the drive member is brought into contact with a surface of the abutment member to stop the drive member when the drive member is rotated through a maximum angle in a first sense.

Abstract: A viewing panel unit is disclosed, 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 (6) 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 (10) configured such that rotational movement of the cam causes linear movement of said second panel relative to said first panel; a shaft (8) extending through the cam; and an engaging member (15), 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 said cam; the e

Abstract: There is disclosed a viewing panel unit, comprising: a first panel and a second panel; a drive mechanism for moving the first panel relative to the second panel; and an abutment member mounted so as to have a fixed spatial relationship relative to the second panel, wherein: the first panel comprises a coupling member; the drive mechanism comprises a drive member configured to engage with the coupling member such that rotation of the drive member imparts a linear motion to the first panel via the coupling member; and the drive mechanism is configured such that a first impact surface of the drive member is brought into contact with a surface of the abutment member to stop the drive member when the drive member is rotated through a maximum angle in a first sense.

Abstract: A viewing panel unit is disclosed, 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 (6) 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 (10) configured such that rotational movement of the cam causes linear movement of said second panel relative to said first panel; a shaft (8) extending through the cam; and an engaging member (15), 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 said cam; the e

Abstract: A domestic viewing panel unit for a door, comprising: a first panel comprising one or more first panel light transparent regions that are substantially transparent to visible light and one or more first panel light hindering regions which substantially hinder transmission of visible light; a second panel comprising one or more second panel light transparent regions that are substantially transparent to visible light and one or more second panel light hindering regions which substantially hinder transmission of visible light; 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 first and second panels are arranged such that the amount of visible light transmitted unhindered through the domestic viewing panel is a non-linear function of the relative position of the first and second panels.

Abstract: A multi-sheet through-vision panel includes a first outer sheet, a second outer sheet, and a middle sheet located between the first and second outer sheets. The first and second outer sheets are superposed with one another. At least one light impairing zone is disposed on at least one of the first and second sheets, as well as the middle sheet. A sliding mechanism slides the middle sheet with respect to the first and second outer sheets so that the light impairing zones are moved between a first and second position. The light impairing zones are superposed with one another when the middle sheet is in the first position, but are in a staggered arrangement when the middle sheet is in the second position.

Abstract: A domestic viewing panel unit for a door, comprising: a first panel comprising one or more first panel light transparent regions that are substantially transparent to visible light and one or more first panel light hindering regions which substantially hinder transmission of visible light; a second panel comprising one or more second panel light transparent regions that are substantially transparent to visible light and one or more second panel light hindering regions which substantially hinder transmission of visible light; 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 first and second panels are arranged such that the amount of visible light transmitted unhindered through the domestic viewing panel is a non-linear function of the relative position of the first and second panels.

Abstract: A multi-sheet through-vision panel includes a first outer sheet, a second outer sheet, and a middle sheet located between the first and second outer sheets. The first and second outer sheets are superposed with one another. At least one light impairing zone is disposed on at least one of the first and second sheets, as well as the middle sheet. A sliding mechanism slides the middle sheet with respect to the first and second outer sheets so that the light impairing zones are moved between a first and second position. The light impairing zones are superposed with one another when the middle sheet is in the first position, but are in a staggered arrangement when the middle sheet is in the second position.