Window locking device and system

A window assembly comprising a window sash, a window frame and a locking device, the locking device comprising:

• a body for mounting to the sash window;
• a locking element moveable between an unlocked position and a locked position;
• a sensor system to detect whether the window sash is in a closed position in the window frame and also to detect whether the locking element is in the locked position;
• and
• a detent mechanism,
• the sensor system comprising;
• a first sensor and a second sensor;
• the first sensor comprising a first lock sensor component mounted for movement with the locking element and a second lock sensor component mounted to the body;
• and
• the second sensor comprising a first window sensor component arranged to be mounted to the sash window and a second window sensor component mounted to the body,
• the detent mechanism arranged to releasably retain or detain the locking element in the locked position or the unlocked position,
• the detent mechanism comprising a biasing member such that a threshold force must be applied to overcome the detent mechanism in order to move the locking element away from the licked position or the unlocked position.

A home automation system comprising a least one window status sensor system for monitoring a sash window having a window sash moveably mounted in a window frame and including a locking device comprising:

• a body for mounting to the sash window;
• a locking element moveable between an unlocked position and a locked position;
• a sensor system to detect whether the window sash is in a closed position in the window frame and also to detect whether the locking element is in the locked position;
• a detent mechanism,
• the sensor system comprising;
• a first sensor and a second sensor;
• the first sensor comprising a first lock sensor component mounted for movement with the locking element and a second lock sensor component mounted to the body;
• and
• the second sensor comprising a first window sensor component arranged to be mounted to the sash window and a second window sensor component mounted to the body,
• the detent mechanism arranged to releasably retain or detain the locking element in the locked position or the unlocked position,
• the detent mechanism comprising a biasing member such that a threshold force must be applied to overcome the detent mechanism in order to move the locking element away from the locked position or the unlocked position.

A method of providing a window status sensor system, in which the window includes a locking device, the locking device comprising:

• a body for mounting to the sash window;
• a locking element moveable between an unlocked position and a locked position;
• a sensor system to detect whether the window sash is in a closed position in the window frame and also to detect whether the locking element is in the locked position;
• and
• a detent mechanism,
• the sensor system comprising;
• a first sensor and a second sensor;
• the first sensor comprising a first lock sensor component mounted for movement with the locking element and a second lock sensor component mounted to the body;
• and
• the second sensor comprising a first window sensor component arranged to be mounted to the sash window and a second window sensor component mounted to the body,
• the detent mechanism arranged to releasably retain or detain the locking element in the locked position or the unlocked position,
• the detent mechanism comprising a biasing member such that a threshold force must be applied to overcome the dent mechanism in order to move the locking element away from the locked position or the unlocked position.