The security of your home is almost completely dependent on the locks with which it is fitted. Despite the increased number of break-ins, many householders still depend on inadequate and antiquated locks to safeguard the home. Mortise locks-types of which are approved by insurance companies-provide good domestic security and are easy to fit and maintain. This chapter describes the various types available and how to fit and maintain them. Judging by official police statements, it is surprising how many householders still depend on inadequate locks to safeguard their homes. They tend to think that the sight of a lock-any lock-will deter the would-be burglar, even though their homes may be filled with valuables.
Of course, this isn’t true; some types of lock, such as rim locks, can be opened in a matter of seconds by the professional burglar equipped only with a few bits of plastic and wire. This is not to say rim locks and other types have no uses; fitted in conjunction with a proper security lock, they give added home protection. What types of lock then, give the sort of protection which insurance companies insist on? The variety is so large as to be bewildering, but the most secure locks all incorporate certain features which will baffle anyone but a Houdini. Firstly, a secure lock, apart from having a sturdy construction, has a mechanism complicated enough to defy attempts to ‘pick it’. Generally it incorporates several levers or tumblers arranged in such a way that only a particular and unique pattern of key will open it. Secondly, the lock is recessed into the door in such a way that only the keyhole is visible on both surfaces of the door. This prevents anyone from unscrewing the lock or forcing it with a lever. Several types of locks incorporate these features, but the one most commonly used is the mortise lock.