How Do Sliding Glass Door Locks Work?

Clasp lock

·         Most standard sliding glass doors latch shut with a clasp lock. A small lever on the door will move a clasp mechanism inside the door shaft. The door frame is outfitted with a hole that holds a small bar where the clasp will be attached. When the door lever is turned, the clasp will usually reach out and upward, hooking itself on the small bar inside the door frame's opening.

Cylinder lock

·         Higher-quality security, such as cylinder locks, are also an option with sliding glass doors. Cylinder locks can usually only be locked shut or opened with a key. With these types of locks, the key is inserted into a cylinder which has a lever attached to the middle or end. The lever moves out and upward, again hooking onto a stationery bar in the door frame to keep it locked shut.

Foot bolt

·         Foot bolts are small, square devices that are screwed into the upper or lower corner of the door. The inside of the foot bolt is filled with a spring activated bolt. When the door is open, the spring is coiled tight and the bolt withdrawn, allowing for the door to slide in its tracks. When the foot bolt is engaged, a small button is usually depressed that uncoils the spring and juts the bolt into the door frame, stopping the door from sliding in its tracks. These can be used in combination with other locking devices.

Security bar

·         A sliding glass door security bar sits in the bottom track when the door is shut, blocking the door's path so it cannot slide open. It can be as elaborate as a metal bar with springs and stoppers on its ends that is tightly lodged into place. It can also be as simple as a board, mop handle or other long, sturdy device that is the right length to stop the door from sliding open on its tracks.

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