Patent ID: 9316046
Filing Date: 2016-04-19
CPC Classification: E06B

Claim Text:
1. 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, wherein the drive member comprises a drive member engaging structure extending along an arc of constant radius of curvature, the drive member engaging structure being configured to engage with a linear coupling member engaging structure formed in the coupling member to move the first panel laterally to the axis of rotation of the drive member, and wherein the first impact surface is formed on a surface lateral of the drive member engaging structure.