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«A DICTIONARY OF LOCKSMITHING By KEITH MAYERS Keith A. Mayers San Diego, CA A Dictionary of Locksmithing ii. NOTE: The user will find information ...»

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HEEL OF A PADLOCK – The end of a shackle which is secured in the padlock case even when the padlock is open.

HEEL-AND-TOE-LOCKING PADLOCK – A padlock with a shackle held locked by a bolt at each end.

HEEL-LOCKING PADLOCK – A padlock with a shackle held locked by a bolt at the fixed, or heel, end.

HEIGHT – See bit height.

HIGH SECURITY CYLINDER – Any of various types of lock cylinders manufactured to a high degree of precision and utilizing various special designs, such as mushroom drivers, angled key cuts and magnetic pins, to resist picking.

HOBBS SHACKLE – A pivoted shackle with a notch on the inside curve near the toe to accept the bolt.

HOLE CHANGE WHEEL – A type of combination lock hand change wheel for which the combination is changed by turning an inner ring and moving a spacer pin attached to it to a different hole in the perforated outer ring.

HOLE SAW – A cylindrical saw with teeth along the circumference of one end and an arbor mount on the other end for cutting large holes, as needed for installing cylinders and cylinder locksets in doors.

HOLLOW MILL DRILL BIT – A drill bit shaped with a hollow in its tip for cutting external cylindrical forms in various materials.

Hollow mill drill bits are used by locksmiths for removing rivets.

HOLLOW POST KEY - Another name for a barrel key.

HOOK BOLT – A bolt which moves both out from the lock face plate and then either to one side or to the other, such as the bolt on most piano locks.

HOOK WARD – A type of wheel ward with a flange so that the A Dictionary of Locksmithing barrel key which passes it must have an L shape. See also wheel ward.

HORN – One of two projections on the hub of a lock to engage the bolt. Also, a round boss cast into the cover of certain locks, especially safe deposit locks and small cabinet locks, to contain the keyway. Also called the nose or the nozzle.

HORN PLATE – The cover of a safe deposit lock of which the horn is a permanent part.

HOTEL FUNCTION LOCK – A lockset in which inside turnpiece works deadbolt; inside knob operates both latchbolt and deadbolt change key and master keys release latchbolt, but only emergency key can retract deadbolt from the outside.

HOUSEKEEPER’S KEY – A grand master key which operates all hotel guest rooms, cleaning closets and linen closets, and any other rooms under the housekeeper’s control. See also maid’s key.

HOUSING – The external case of a lock. Also called the shell, or, in the case of a cylinder lock, called the cylinder housing.

HUB – A door lock part with a square hole in the center to accept the spindle and with two projections, called horns, to withdraw the lock’s springbolt when turned by the knob. The hub is sometimes called a follower. Also, the part of a combination lock wheel into which the change key fits in order to lift the levers and release the inner wheel for changing the setting.

HUB SPRING – A piece of spring steel fitted to the hub of a door lock to return the hub and the lock’s latch to rest position after release of the knob.

IGNITION PULLER – A tool for removing automobile ignition locks from steering wheel columns.

ILLUMINATED MAGNIFIER SCOPE – A small hand-held light with a built-in magnifying glass for examining keyways and other dark recesses. Also called a focusing light.

IMPRESSIONING – A technique of fitting a key to an existing A Dictionary of Locksmithing 33 combination in a lock, without taking the lock apart, when no existing key is available to copy. The method involves binding the tumblers in their chambers with a turning action on an inserted key blank so that up and down or in and out movement of the blank will cause a small mark, called an impression, to appear along the top edge of the key blade for each of the bound tumblers. The locksmith files each key cut until impressions stop appearing. No impression at a key cut indicates that the tumbler has cleared the shear line, is no longer binding against the wall of the cylinder housing and that, therefore the key cut is the proper depth. When every key cut is so filed, the plug will turn and the lock will open.

IMPRESSIONING TOOL – Any of a number of special tools to aid in making clear impression marks along the top edge of a key blank.

INCLUDED ANGLE – The angle formed by the two slopes of a cylinder key keycut. See slope angle.

INCREMENT – An increase in the length of a pin or in the depth of a key cut; that is, the size difference, measured in thousandths of an inch, between the depth of one key cut and the depth of a key cut of the next closest possible size, according to manufacturer’s specifications. Increments vary from one type of lock to another.

Also called the bitting increment, and, occasionally, the interval.

INDEX – A pointer to which a combination is dialed on a combination lock. To index means to measure from a certain point.

INDICATING BOLT – See indicator.

INDICATOR – A button on hotel guest room locks which moves in or out to show whether or not the room is occupied. Also, a button inserted into a safe deposit lock keyway to show unpaid rent or an unrented box. Also, the index on a combination lock dial ring.

INNER RING – A non-fixed, geared part of a combination lock tumbler wheel which determines the setting of that wheel and hence also determines part of the lock’s combination.





INTERCHANGE – The ability of a key from one lock to open anA Dictionary of Locksmithing other lock it was not meant to open. Interchange occurs most often in poorly master keyed systems because the combinations are uncontrolled.

INTERCHANGEABLE CORE – The removable unit of an interchangeable core cylinder which contains the plug, the sleeve, the tumblers and the upper chambers of the lock. See also interchangeable core cylinder, removable core and removable core cylinder.

INTERCHANGEABLE CORE CYLINDER – A cylinder, used in interchangeable core systems, in which the plug and tumblers form a separate unit, called the core, which is held in place in the cylinder by a special sleeve, also called the slide, operated by a control key.

Interchangeable core cylinders permit a person to rekey a lock or a group of locks without special training by simply inserting and turning the control key, pulling out the old core and putting in a new core. See also interchangeable core, removable core and removable core cylinder.

INTERPASSING – A British name for cross-keying.

INTERVAL – A name, used primarily in England, for increment.

JAMB – The vertical member of a door frame or of a window frame which forms the side of the opening.

JIGGLING – See raking.

JIMMY – Any tool, such as a short crowbar, to provide leverage for jimmying open locked doors.

JIMMY-RESISTANT LOCK – A lock with a bolt which moves up or down into its strike instead of moving in and out of the door frame, so that prying the door will not release the bolt of the frame.

Also called a jimmy-proof lock.

KEEP – The staple, or catch, mounted to a door frame, which receives the latch of a Suffolk latch when the door to which the latch is attached is closed.

KEEPER – Another name for a strike.

KEEPER SLOT – A slot in the collar of a locking handle which A Dictionary of Locksmithing 35 holds the protruding section of the locking lug and keeps the handle from turning when locked.

KEY – An instrument, almost always portable, for opening and closing a lock by arranging the lock’s tumblers according to a preset pattern of key cuts called a combination.

KEY BITTING –See bitting.

KEY BITTING DEPTH – The depth of the notch which is cut into the blade of a pin tumbler or disc tumbler key.

KEY BITTING LIST – A list of all the combinations of key bittings for both master keys and change keys used in a master key system, furnished with the system to allow proper servicing and control of the system.

KEY BLANK – See blank.

KEY-BY-NUMBER – A key made to a combination of key cuts found under a known code number in a listing of codes.

KEY CHANGE – See change.

KEY CHANGE COMBINATION LOCK – A combination lock for which the combination can be changed by inserting a key into a special hub to release the inner ring of the wheel. See also key change wheel and combination lock.

KEY CHANGE NUMBER – The code number, usually stamped on a change key, by which the recorded key combination is located.

KEY CHANGE WHEEL – A combination lock tumbler wheel in which the combination is changed by turning a change key one quarter turn to release the geared inner ring.

KEY CODE – See code.

KEY CONTROL – An organized method of recording, issuing, collecting and holding all the keys in a given building or group of buildings in order to maintain effective security.

KEY CUT – A square, rounded or V-shaped depression, filed or machined into a key, to allow the key to turn in its lock. In tumbler locks, the series of key cuts on a key causes the tumblers to line up at the shear line or gate so the lock will open. In warded locks, the A Dictionary of Locksmithing key cuts bypass the wards so the key can push or pull the bolt.

KEY DEPTH GAGE – A gage, usually with tapered cutouts, and indexed to match key depths for a specific lock, used to check the accuracy of key cuts on a key intended to fit the lock. Also called a key decoding gage.

KEY DECODING GAGE – Another name for a key depth gage.

KEYED ALIKE – A lock combination in which the same change key works two or more locks.

KEYED DIFFERENT – A lock combination in which a different change key is needed for each of two or more locks.

KEYED-TO-PASS – A lock combination in which a given lock will work with a limited number of different change keys or master keys or in which a given key will open a number of different locks.

KEY EXTRACTOR – Any of several thin tools used to remove broken key segments from a lock keyway, often homemade from spring steel wire, crochet hooks, fish hooks, coping saw blades and the like.

KEY GUIDE – A half-round metal tube which helps direct a bit key through a door into its rim lock. Also, an adjustable part of a key machine which follows the contour of a sample key while the cutting wheel recreates that contour on a key blank. Also called a depth guide or a profiler, it controls accuracy of key cut depth.

KEYHOLE – The opening in a lock to accept a key.

KEYHOLE ESCUTCHEON – A small, decorative escutcheon with a keyhole only.

KEYHOLE LOCK – A small pin tumbler lock used to block the keyhole of a warded bit key lock.

KEYHOLE PLUG – Another name for a keyhole lock.

KEYHOLE WARD – A projection into the keyhole of a bit key lock from the side of the keyhole which prevents a bit key from entering unless it has a side groove, called a bullet, cut along the bit width.

The keyhole ward is usually part of the metal cover of the lock case.

KEYING – The choice of combinations for a lock or a group of A Dictionary of Locksmithing 37 locks to meet certain requirements, such as keyed alike, keyed different, master keyed, maison keyed, keyed-to-pass.

KEYING LEVELS – The divisions of a master key system, each higher level operating more groups of locks than the next lower level.

KEY-IN-THE-KNOB LOCKSET – Another name for a cylindrical lockset.

KEY-IN-KNOB LOCKSET – Another name for a cylindrical lockset.

KEY LOCKING DIAL – A combination lock dial which has a separate keyed lock in its center to prevent rotation.

KEY LOCKING DIAL RING – A dial ring with a key lock to lock the dial in place and to prevent rotation.

KEY MACHINE – A machine designed for making key cuts. Also called a duplicator. The standard key machine has a rotating cutting wheel and a pair of joined, movable vises—one for a sample key and one for a key blank. The operator guides the sample key in one vise over an adjustable guide and the key blank in the other vise automatically passes and is shaped by the cutting wheel. See also code cutter.

KEYMAKER’S FILE – See cylinder key file.

KEY MICROMETER – A precision measuring instrument used to determine the depths of key cuts to within one thousandth of an inch.

See also anvil, sleeve, spindle, thimble.

KEY PLATE – A small escutcheon with no hole other than a keyhole. Also called a keyhole escutcheon. See also drop escutcheon.

KEY SECTION – The shape of a key blade in cross section—that is, viewed in the plane perpendicular to the length of the blade— determined by the shape of the keyway it fits. Key blank illustrations show key sections as viewed from shoulder to tip. For a given key section, the milling of the key matches the broaching in the barrel, or plug, of the lock.

KEY SECTION SERIES – A group of key sections used together in the master key system to provide greatly increased numbers of key A Dictionary of Locksmithing changes by permitting a repetition of the same bittings on different key sections. Master keys are milled so they will enter some or all of the different keyways in the system. Each keyway in the series is called a sectional keyway.

KEY SET – The group of letters and numbers which identify an individual key in a master key system. See also symbol.

KEY SLOT – The opening in a disc tumbler which allows the key to pass and which is positioned on the disc so the correct key cut will align the disc with the shear line.

KEY STOP – The end of a flat steel key blade, and also of certain cylinder key blades, opposite the bow, which limits the travel of the key into the keyway, as does the shoulder on a standard cylinder key.

The positions of the key cuts on blades of this type are indexed from the key stop. See also shoulder.

KEY SYMBOL – See symbol.

KEYWAY – The longitudinal milling or broaching in a cylinder plug, shaped to accept a key with the correct key section—that is, with matching grooves in the sides of the key blade.

KEYWAY SHUTTER – A cover which closes off a keyway when there is no key in it to keep out foreign matter or to prevent easy access to the keyway. The dust caps on the door and trunk locks of automobiles are examples of keyway shutters. Keyway shutters which often appear on old style bit key locks are called drop escutcheons.



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