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Heavy duty products that place plates on either side the door tied together with screws or bolts can be used to prevent delamination. Door chains — allows the doors to be opened slightly to view outside while still remaining locked. Secondary, internal locks — sliding bolts, hooks and speciality latches, metal blocks or bars mounted internally.
A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille, made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.
The Bramah lock used a cylindrical key and keyhole, as does the current lock. The end of the key has a number of slots of different depths which, when inserted into the lock and pressed against spring tension, would depress a number of wafers to a specified depth and enable the key to turn and open the lock.
Adolph Schoepe and friend [2] Karl Rhinehart founded Gateway Manufacturing Company in South Gate just before the end of World War II. They manufactured locks under the Kwikset brand. They moved the company to Anaheim in 1948. [2] During the Korean War, demand plummeted, but the company took a risk, producing more goods than they could sell.
Lock block – A solid block of wood mounted within a hollow-core flush door near the bolt to provide a solid and stable location for mounting the door's hardware. Stave-core – Consists of wooden slats stacked upon one another in a manner similar to a board & batten door (though the slats are usually thinner) or the wooden-block hollow-core ...
In a manual mantrap, a guard locks and unlocks each door in sequence. An intercom and/or video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door.