| 摘要 |
<p>A non-biased security lock (20) for a double-hung window assembly (10) is disclosed as well as a method of securing a double-hung window assembly (10) using the sash lock (20). One or more security locks (20) are installed in one or more recesses (71) in the stile (15) of an outer window sash (14). In an open, or locked, position, a locking tab (22) is rotatably disposed about a pivot pin (39) substantially perpendicular to the stile (15) of the outer window sash (14). The locking tab (22) arrests further displacement of the inner window sash (12) when the header (13) of the inner window sash (12) encounters the extended locking tab (22). The locking tab (22) is restrained by a pair of pinions (35); hence any force or load applied to the locking tab (22) is transferred as moment to the pinions (35). In a closed, or unlocked, position, the locking tab (22) is rotatably disposed about the pivot pin (39) so that the upper surface of the locking tab (22) is flush with or substantially below the outer surface of the stile (15) of the outer window sash (14) so that the sash lock (20) does not hinder relative movement of the window sashes (12, 14).</p> |
