By Graham Pulford
High-Security Mechanical Locks comprehensively surveys and explains the hugely technical quarter of excessive safeguard locks in a fashion that's available to a large viewers. good over a hundred assorted locks are awarded, geared up into 6 simple varieties. each one bankruptcy introduces the required suggestions in a old viewpoint and extra categorizes the locks. this is often by way of distinct 'how it works' descriptions with many photos, diagrams and references. The descriptions are in response to real dissections of the genuine locks.
The scope is proscribed to key operated mechanical locks, hence keyless blend locks and electronic locks aren't coated. The e-book doesn't care for regimen locksmithing themes corresponding to set up and servicing of locks. The delicate region of deciding on and bypassing of locks is handled in simple terms at a excessive point with out giving designated details that may be unacceptable within the fallacious arms.
* entire assurance of over a hundred kinds of nineteenth and twentieth century key-operated locks, unified in an easy class scheme
* designated working ideas - transparent 'how it works' descriptions
* Manipulation resistance ranking for every lock on a scale of one to five
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Additional resources for High-Security Mechanical Locks: An Encyclopedic Reference
The term “lateral” is used to describe longitudinal warding in a plug or milling on a key blade. For locks with a single row of pins, pin position or “space” numbering starts from the front of the cylinder or the shoulder of the key. ) For other locks the description is tailored to the particular geometry in question. Pin-tumbler sizes (depths) for bottom or key pins are generally numbered from 0 upward, corresponding to the required depth of cut. Thus a size 0 pin requires the minimum cut to the key blank.
Several points should be noted in connection with this. First, this information is of a theoretical nature and provided only for illustrative purposes. In practice, the lock manufacturer and/or locksmith who combinates the lock determines which key codes are supported and which are not. The net result is that the practical or usable number of combinations is always less than the theoretical number, usually signiﬁcantly so. The estimates that we provide by combinatorial analysis are based purely on simple factors like the number of pin sizes (or depths of cut) and the number of pin positions.
In a lock having only one segmented pin stack with N master pins, the number of keys that can operate the lock is equal to N + 1, corresponding to the number of diﬀerent shear lines. Whenever more than a single pin stack is segmented, which typically occurs in master-keyed systems, 3 The symbol ˝ is used to denote inches. For ordinary locks, a change key, as opposed to a master key, operates a unique lock or set of locks that are keyed alike. For recombinatable locks, a change key is the tool required to reset the lock to a new combination.