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locksmiths.co.uk
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Definitions (111)
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Suite
A group or collection of locks and/or locking latches and padlocks of different types and changes incorporated together under a master key or grand master key.
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Anti-thrust bolt
A spring bolt, for a night latch particularly, which cannot be pushed back when it has shot out and fastened a door, although it can be withdrawn by knob or key. This security device is usually achieved by a dog inside the latch case which falls behind the bolt and keeps it shot out when an auxiliary slide is pushed in.
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Anti-thrust plate
An overlapping metal plate fitted to outward opening doors so as to prevent access to lock bolts. Automatic deadlatch A deadlatch, the main bolt of which is automatically locked (or deadlocked) when the door is closed.
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Backplate
The plate, fixed on a door, to which the moving parts of a lock or latch are attached. Backset The horizontal distance from the outside face of the outer forend to the centre of the keyhole or follower hole (or both). Designated as the “keyhole backset” or “follower backset”.
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Blank or key blank
A partly made key, which has been shaped to enter the keyhole of a certain type of lock or latch, but of which the blade has not been finally notched to operate any individual lock.
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Bolt
The part of a lock or latch which provides the fastening or engagement by protruding from the case or forend to engage in the staple, striking plate, link, shackle or other member.
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bow
(of key) That part of the key which is held in the fingers when operating the lock or latch.
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BS 3621
The British Standard specification for Thief Resistant Locks for hinged doors. Locks submitted for certification must satisfy the requirements of the ten stringent clauses of the specification .
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Cabinet lock
A generic term to include all locks of any type for use on pieces of furniture, such as cupboards, drawers, chests, boxes and the like.
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CAM
Usually a tongue fixed to the end of the plug of a cylinder lock or latch.
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