Patent ID: 9428945
Filing Date: 2016-08-30
CPC Classification: E05C,E05D,E05F,E05Y,Y10T

Claim Text:
1. A device to limit an opening of a window having a sash hinged to a window frame with a hinge spaced apart from the device, the sash being selectively movable between a window closed position in which the sash is received in the window frame, and a window open position in which the sash is pivoted outwardly relative to the window frame, the device comprising: a sash bracket adapted to attach to the sash; an arm assembly having a pair of ends, the arm assembly being operably coupled to the sash bracket at one of the pair of ends and having an engagement structure at the other of the pair of ends; and a securing structure adapted to attach to the window frame, the securing structure including a selectively operable release mechanism, wherein the securing structure receives and engages the engagement structure of the arm assembly so that the arm assembly inhibits pivoting of the sash toward the window open position beyond a distance of travel defined by a length of the arm assembly when the securing structure is initially engaged with the engagement structure, and wherein the engagement structure is releasable from the securing structure by operating the release mechanism so that the sash can be further pivoted toward the window open position beyond the distance of travel, the arm assembly further comprising a biasing spring arranged to bias the engagement structure into alignment with and towards the securing structure when the engagement structure is not received by the securing structure, such that the engagement structure is automatically reengaged with the securing structure after the engagement structure is released from initial engagement with the securing structure, when the sash is pivoted from the window open position to the window closed position.