A lock bar is an extension that transfers the rotary action of a central lock to a door frame or a separate locking mechanism for sliding doors. It can be used in low or high-security applications and can feature up to seven separate bars per door. Installing a lock bar is an efficient way to add extra security to sliding doors.
A lock bar is a flat or round extension that transfers the rotary action of a central lock to a door frame. The term also applies to a single length or telescopic bar used as a separate locking mechanism for sliding doors. In the case of a transfer mechanism, the lock bar is typically hinged to a rotating lever on the lock mechanism. When the lock is activated, the bar is pushed outward to lock into the recesses in the door frame. Sliding door lock bars are simple hinged or removable bars that attach to the door frame and lock onto the sliding door, preventing it from opening or lifting off the track.
The term lock bar can be used to describe both rotary extension bars and sliding door lock bars. Rotating lock bars are commonly used in low security applications such as fixed metal cabinets and in high security entrance door mechanisms. These lock bars are usually flat or round lengths of steel attached to a rotating cam on the central locking mechanism. The bars can attach to the sides of the cabinet frame or travel vertically to lock into the top of the frame. There are typically only two locking bars in this type of mechanism.
High security entry door lock bar arrangements are substantially more robust and can feature up to seven separate bars per door. Unlike cabinet lock bars which have very little or no support within the door itself, high security lock bars usually go through several close tolerance machined bushings on the inside of the door. Another difference between the two systems is that the locker latch bars are usually exposed behind the door while the high security variants are totally enclosed within the door. The medium latch bar in this type of system is also generally round in profile and much sturdier than in the cabinet versions. These systems generally lock into both sides and at the top of the frame and into the floor.
Conventional sliding door locks are notoriously weak; more often than not they are the first choice of entry point for thieves. One of the most efficient ways to add extra security to sliding doors is by installing a lock bar. This device is a simple hinged, single-length or telescoping steel bar that attaches to the door frame or wall and locks onto the door. When locked in place, the door cannot be opened and is also more difficult to lift off its tracks. Upon opening the door, the bar is unlocked and snapped shut or, in the case of single-length removable bars, removed from the frame hinge and stowed away.
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