Patent ID: 11958083
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 11:
12. A sash system, comprising:
a sash;
a counter-weight coupled to the sash by a coupling member;
a locking mechanism coupled to at least one of the sash and the coupling member and transitionable between an open configuration where the locking mechanism does not inhibit movement of the at least one of the sash and the coupling member, and a locked configuration where the locking mechanism inhibits movement of the at least one of the sash and the coupling member; and
a controller coupled to the locking mechanism and configured to control operation of the locking mechanism to selectively transition between the open configuration and the locked configuration based on a condition of the sash;
wherein the sash includes a ferromagnetic portion;
wherein the locking mechanism comprises an electromagnet;
wherein the locking mechanism is configured to selectively inhibit motion of the sash due to an electromagnetic force between the electromagnet and the ferromagnetic portion of the sash when the electromagnet is energized.