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 0:
1. 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 and the counter-weight are configured such that when the locking mechanism is in the open configuration, the sash lowers due to gravity, wherein the controller is configured to transition the locking mechanism to the locked configuration based on the condition being a first condition;
wherein the controller is configured to transition the locking mechanism to the open configuration based on the condition being a second condition different from the first condition;
wherein the first condition comprises at least one of:
the sash lowering solely due to an effect of gravity, and
the locking mechanism is in the open configuration and the sash not lowering;

wherein the second condition comprises at least one of:
the sash being manually moved,
a time since a last movement of the sash exceeding a first threshold value,
no person being detected proximate to the sash, and

a time elapsed since a person was detected proximate to the sash exceeding a second threshold value.