B

Backcheck

The feature of a door closer unit that prevents shock and possible damage when the door is forcibly opened.

Backset

The horizontal distance from the face of the lock to the centre line of the cylinder, key hole or knob hub.

Barrel

A cylindrical portion of the cylinder that rotates when the correct key is used.

Bi-fold

A sliding door or window with sections that fold onto one another as the door opens.

Box strike

A strike in which the latch bolt recess is enclosed or boxed, thus covering the opening in the jamb.

C

Chamber lock / rim lock

Spring-bolt lock or latch built into a square iron box and mounted on the surface of the door, on the inside. Originally opened with a door handle and key, later with a door knob and key. Manufactured from the 17th to the 19th century.

Chubb lock

A barrier lock for safe doors, designed and patented by Jeremiah Chubb.

Cylinder

The assembly incorporating the key operated mechanism.

Cam

A lever attached to the end of a barrel to activate the lock mechanism.

D

DIN class

DIN, the German Institute for Standardization, develops norms and standards as a service to industry, the state and society as a whole. A registered non-profit association, DIN has been based in Berlin since 1917.

DIN EN

DIN EN:  European Standard that has been published, unchanged, in Germany. In fact, all CEN/CENELEC member countries are required to adopt European Standards in this manner.

Deadbolt

A bolt which is not activated by a spring. When locked the bolt cannot be returned by end pressure.

Dead latch

A lock containing a dead latch bolt.

Deadlatch bolt

A spring actuated bevelled latch bolt which operates in conjunction with an auxiliary bolt which automatically locks the latch bolt against return by end pressure.

Decoding protection

Decoding protection refers to the degree of difficulty in ascertaining the tumbler locking codes in a locking cylinder surreptitiously, using suitable tools but without using undue force, in order to cut a duplicate key in accordance with the dimensions which have been revealed.

Drilling protection

IKON profile cylinders are fitted with drilling protection as standard. The hard metal pins used in the cylinder core and housing, for instance, prevent the locking cylinder from being drilled open. Increased drilling protection in security category 1 and 2 can be supplied to meet special locking system security requirements.

Deadlocking latch

A lock with a spring-actuated latch bolt. When the door is closed, the key or turn knob is operated to deadlock the latch bolt against return by end pressure

E

Emergency mechanism

Each authorised emergency key within an IKON locking system can open or lock double profile cylinders fitted with an emergency mechanism, even when there is another key inserted in a lock position on the other side.

Electric strikes or door opener

An electrical device that replaces a regular lock strike to enable a door to be released by remote control.

F

Finish

Final cover treatment of the product for appearance and protection, in both plated finishes or powder coat colour.

Furniture

Fittings complimentary to the lock systems, such as handles and escutcheon plates.

G

Grand master key

A key which will operate two or more groups of locks, where each group can be operated by individual master keys and locks within each group can be operated by different service keys.

H

Handed products

A product designed or assembled for use only on right hand doors or only left hand doors, but not both.

Handing

The direction of door travel (swinging or sliding) and the locking/secure side of a door, eg. Right hand (opening out), left hand (opening out).

Hold-back

A catch or other device on a lock which can hold the latch bolt in the retracted position.

Hold-open

The feature of a door closer unit which enables a door to be held in the opened position until released.

I

Indicator bolt

A slide-action bolt installed in areas where privacy is desired (such as toilets and bathrooms) which provides visual indication that the room is occupied or vacant.

Installation lengths

The basic length of a double profile cylinder is generally 61 mm (L = 30/30). Besides standard lengths, which can be extended in 5 mm increments up to a total length of 140 mm, special lengths are also available in 10 mm increments up to a total length of 240 mm.

K

Key copying protection

The large number of possible locking configurations and low manufacturing tolerances ensure the risk of an IKON locking cylinder being unlocked with a different key is kept to an absolute minimum.

L

Lock

A lock is a mechanical device used to prevent the opening of a door, etc., without the proper key. The lock is a complex combination of technology, mechanics, electronics, digital technology, design and choice of materials to achieve the primary task of moving a bolt to open or closed position, usually by turning a key – transferring the lateral force of the key bit to the bolt of the lock. Locks come in a huge number of designs meant for different uses, such as door locks, padlocks, car locks, cabinet locks, safe locks, coin locks, etc.

Latch bolt

A spring actuated, bevelled bolt usually operated by door furniture.

Lockset

A lock, complete with strike and door furniture, such as knobs, levers, escutcheons, or handles.

Latch

The fastening on a door that fits into the notch or slot on a door jamb and is lifted from either side by the handle.

Lock picking protection

Lock picking protection refers to the degree of difficulty in unlocking the locking components in a locking cylinder with suitable tools without using the original key and without using undue force. IKON locking cylinders feature a whole range of precautionary measures to prevent attempted break-ins with picking tools: paracentric key profiles, blocking rails, blocking pins, finger pins and locking wave mechanisms. IKON locking cylinders offer optimum protection against lock picking.

M

Master key

Key that opens all the locks in a lock system, whether for a single building or a whole residential area.

Mortise lock

A thin lock housing that is inserted and fastened in an opening (mortise) in the front edge of the door. The lock is completely protected by the door.

N

Negative pressure

A pressure imbalance between the inside and outside of a window/door resulting in a force tending to pull the window/door off a building.

Nightlatch

A lock with a spring-actuated latch bolt.

Non-handed

The ability to reverse the product or key component to suit left or right-hand installation.

O

One-Way screw

Screws with specially shaped heads to prevent removal by conventional screwdriver.

P

Parallel arm door closer

A type of door closer installation where the arm is mounted parallel to the door, for use where the door closer is installed on the inside of an opening out door.

Passage set

A term commonly used to describe a latch set with handles on both sides of a door but no locking function.

Pin tumblers

Small sliding pins in a lock cylinder which work against coil springs and prevent the cylinder plug from rotating until the correct key is inserted.

Q

R

Rebated lock/latch

A lock which has the faceplate and strike shaped to match the rebated edge of a door, usually the meeting edges of two door leaves.

Rim lock / chamber lock

Spring-bolt lock or latch built into a square iron box and mounted on the surface of the door, on the inside. Originally opened with a door handle and key, later with a door knob and key. Manufactured from the 17th to the 19th century.

S

Service key

A key which will only operate the lock that has been built to suit that service key.

Single-Action escape lock

A lockset installed to a door where exit is obtained by a single action without the use of a key.

Spindle

The drive shaft that connects the knob or lever to the latch or lock mechanism to operate the bolt.

Strike

A device fixed in or on a doorjamb into which the lock or latch bolt engages when the door is closed.

Strike box

A security component used in conjunction with the strike plate to help protect the bolt against end pressure.

T

Tubular bolt/latch

A bolt having a tubular case.

Turn knob

Turning mechanism that activates the door lock from the inside, a convenient locking option in place of a key.

Ü

V

VdS class

Certification mark issued by VdS-Schadenverhütung, the German insurance industry's certification centre. All IKON locking cylinders described here can be optionally supplied with VdS certification.

Vestibule

A hall or lobby next to the entrance door of a dwelling and from which other doors open to various rooms.

VdS Schadenverhütung

VdS Schadenverhütung is the independent, international, accredited and notified testing and certification institution for fire prevention and safety technology as well as for physical and electronic protection against intrusion.

W

Y

Yale lock

A cylinder lock (previously called patent lock) invented in the 1840s by American Linus Yale Sr. (1797–1857).