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In this configuration, applying electric current to the strike will cause it to lock. It operates the same as a magnetic lock would. If there is a power failure, the door opens merely by being pushed or pulled. A new trend is a strike that is quickly field-installation reversible from fail safe to fail secure (and back again if needed).
When the door is closed, the bolt extends into the hole in the strike plate and holds the door closed. The strike plate protects the jamb against friction from the bolt and increases security in the case of a jamb made of a softer material (such as wood) than the strike plate. Some strike plates have their hole size and placement calculated so ...
The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.
Door with two locks, one in the doorknob and a separate deadbolt. A deadbolt or deadlock is a type of lock morticed into a wooden door where a bolt is thrown into the door frame, using a key from either side, to secure the door. [1] It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle.
This armor protects against stab threats with a strike energy of 24±0.50 J (17.7±0.36 ft·lbf). The overtest condition for this level is 36±0.60 J (26.6±0.44 ft·lbf). Level 2 armor is medium-level protection suitable for extended wear and may be either overt or covert.
Pittsburgh Plate Glass Company was founded in 1883 by Captain John Baptiste Ford and John Pitcairn, Jr., at Creighton, Pennsylvania. PPG soon became the United States' first commercially successful producer of high-quality, thick flat glass using the plate process.