By James M. Edgar

Using Locks in actual Crime Prevention: nationwide Crime Prevention Institute

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Extra resources for The Use of Locks in Physical Crime Prevention. National Crime Prevention Institute

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43 LOCK BODIES into the door on contact with the lip of the strike, it is difficult to make the throw much longer. But, because there is always some space between the door and the frame, this means that a latch may project into the strike no more than one-quarter inch (often as little as one-eighth inch on poorly hung doors). Most door jambs can be spread at least one-half inch with little effort, permitting an intruder to quickly circumvent the lock. Another undesirable feature of the latch bolt is that it can easily be forced back by any thin shim (such as a plastic credit card, or thin knife) inserted between the face plate of the lock and the strike.

Modified latchbolts. 44 THE USE OF LOCKS IN PHYSICAL CRIME P R E V E N T I O N reduce the closing pressure required to force the latch bolt to retract. This permits a heavier spring to be used in the mechanism. Most modern anti-friction latches also incorporate an anti-shim device. Without it, the anti-friction latch is extremely simple to shim. Deadbolt The deadbolt is a square-faced solid bolt which is not springloaded and must be turned by hand into either the locked or unlocked position. When a deadbolt is incorporated into a locking mechanism, the result is usually known as deadlock.

The Sargent Keso mechanism. The Keso lock can be master keyed to seven levels (compared to four levels in the conventional pin tumbler lock). Because of the use of twelve pins and variable pin spacing which provides a very high number of combinations to eliminate cross keying, the Keso lock can be master-keyed with no significant loss of security. Medeco Sidebar Pin Tumbler Cylinder Mechanism. This cylinder, marketed by the Medeco Lock Company, uses a sidebar in addition to pins to lock the device.

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