Patent ID: 8646627
Filing Date: 2014-02-11
Classification: A47F,E05D,E05Y,E06B

Abstract:
1. An apparatus comprising: a horizontal upper track; a panel structure linked to the upper track for movement along the upper track; a horizontal lower track configured to be shifted relative to the panel structure throughout a vertical range of selectable positions in which the lower track engages the panel structure in a condition to guide the panel structure along the lower track simultaneously with movement along the upper track; and a support structure configured to releasably retain the lower track in each of the selectable positions; wherein the lower track is configured to remain in the engaged condition when moving relative to the panel structure throughout the vertical range of selectable positions; wherein the panel structure has an upper section configured to depend from the upper track and a lower section configured to engage the lower track at a location spaced horizontally from the upper section when the upper section is vertical.