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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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KNOB – A round, or at least symmetrical, door handle, which usually turns to release a latch; used for pulling a door open and for pushing it closed as well as for freeing the latch.

KNOB SHANK – That portion of a knob which passes through the rose into the door. Also called the knob sleeve or the neck.

KNOB SLEEVE – Another name for a knob shank. Also, the removable back portion of the knob on certain cylindrical locks.

KNOB TOP – The grip of the knob attached to the shank.

KNUCKLE – The rounded part of a butt hinge which encircles the hinge pin A Dictionary of Locksmithing 39 LAMINATED PADLOCK – A padlock made from a series of steel plates, called laminations, riveted together, with holes stamped through the plates to allow room for the shackle and the lock mechanism. Laminated padlocks are often warded padlocks.

LATCH – A door fastener, often a beveled springbolt, retracted by a knob or handle, but most often without a locking function.

LATCHBOLT – Another name for a latch.

LATCH GUARD PLATE – A steel plate bolted to a door to cover the gap between the door and the frame, in the vicinity of the latch and the strike, to prevent jimmying and loiding.

LAYOUT BOARD – Another name for a pin tray.

LAZY CAM – A cam which moves less than its cylinder plug.

LEADING EDGE – The vertical edge of a swinging door, opposite the hinges, through which the bolt protrudes.

LEADING FACE – The side of a door from which the hinge knuckles can be seen when the door is shut. See also trailing face.

LEAF – One member of a hinged double door or a hinged double window.

LEFT HAND LOCK – A lock used with a left hand door. See handing of doors.

LEVEL ONE MASTER KEY – A sub-master key of the lowest possible level which controls no more than four cylinders.

LEVEL TWO MASTER KEY – A sub-master key which controls cylinders set to any of 16 possible combinations in a master key system.

LEVEL THREE MASTER KEY – A master key which controls cylinders set to any of 64 possible combinations in a master key system. Also called a segment master key.

LEVEL FOUR MASTER KEY – A master key which controls cylinders set to any of 256 possible combinations in a master key system. Also called a quad master key.

LEVEL FIVE MASTER KEY – A master key which controls cylinders set to any of 1,024 possible combinations in a master key A Dictionary of Locksmithing system. Also called a section master key.

LEVEL SIX MASTER KEY – A master key which controls cylinders set to any of 4,096 possible combinations in a master key system. Also called a grand master key.

LEVEL SEVEN MASTER KEY – A master key, invariably the top master key, which controls cylinders set to any of 16,384 possible combinations in a master key system.

LEVER – A geared part of a combination lock tumbler wheel in a key change combination lock which locks the wheel’s setting in place until the change key is inserted into the hub to release the gears of the inner ring. Also called the wheel arm. Also, that part of a combination lock to which the fence is attached and by which the bolt is retracted after the proper combination has been dialed. Also called a drop arm. Also, a lever tumbler. Also, the detent or the sweep of a safe deposit lock changeable tumbler.

LEVER ACTION BOLT – A flush fitting door or window bolt extended and retracted by swinging a lever with the thumb. The extended bolt fits into a hole in the head or the sill of the door or window frame.

LEVER HANDLE – A horizontal handle used in place of a knob to release the latchbolt on some doors.

LEVER SPRING – A flat spring fixed to the post end of a lever tumbler to keep the lever in the keyway.

LEVER TUMBLER – A flat metal, spring-loaded tumbler which pivots on a post and has a gate cut into it at one of various positions to permit the bolt fence to pass through as the bolt is retracted or extended with use of the proper key. The positions of the gates determine the combinations in lever tumbler locks.

LIFT RADIUS – The curved area on the bottom edge of a lever tumbler across which the root of the key cut moves when the key is turned. Also called the belly.

LIGHT – A compartment in a window which holds a single piece of glass, divided from other such compartments, if any, by mullions.

A Dictionary of Locksmithing 41 LIP – The mildly curved segment of a strike which protrudes beyond the edge of a door to protect the molding of the door frame and to help the latchbolt slip into place.

L.O.B.C. INDEX – The index to which a combination is dialed when removing the cover of some safe combination locks for repair or for combination changing. The initials, L.O.B.C., stand for locked on by combination.

LOCATING BOSS – A protrusion on some lock cases, especially safe combination locks, which insures proper alignment of the lock case in its mounting.

LOCK – A mechanism for fastening two or more objects together so they can be separated with relative ease only by those with proper authority.

LOCK BEVEL – The angle between the face of a mortise lock and the body of the lock which matches the angle of the door bevel. A lock has a regular bevel if the door opens in and a reverse bevel if it opens out. See also door bevel.

LOCKING BOLT – See locking dog.

LOCKING BOLT SPRING – A compression coil spring which pushes the locking bolts into their notches in the shackle.

LOCKING DOG – That part of a padlock which locks the shackle in place. Often called simply the bolt or the locking bolt.

LOCKING GAS CAP – A cap for an automobile gasoline tank with a lock cylinder mounted in its center which operates a double retracting bolt by means of a cam.

LOCKFACE – See face.

LOCK FUNCTION – The arrangement of the parts of a lockset so that certain of its control elements, such as the knob, the key and the thumb turn, will operate certain of its locking elements, such as the latch or the deadbolt, in a specified way. Lock functions are currently used primarily on mortise locksets and cylindrical locksets. See also apartment function lock, classroom function lock, closet function lock, communicating function lock, dormitory function lock, hotel A Dictionary of Locksmithing function lock, office function lock, passage function lock, privacy function lock and storeroom function lock.

LOCKING GROOVE – An indentation in the housing of a disc tumbler lock into which the tops of the discs fit when locked to keep the plug from turning.

LOCKING HANDLE – A T-shaped or an L-shaped cabinet handle with a plug through the center, locked and unlocked by turning the key to raise or lower a cam-activated lug, called the locking lug, which fits into the keeper slot in the collar. The collar is mounted on the door.

LOCKING LUG – That part of an interchangeable core sleeve which holds the core in its housing and which is retracted by the control key. Also, part of a locking handle.

LOCKING ROD – The rod which connects the lock button to the door latch on automobile door locks.

LOCK-IN-THE-KNOB – Another name for a cylindrical or keyin-the-knob lockset.

LOCK-KNOB – Another name for a cylindrical or key-in-the-knob lockset.

LOCKOUT KEY – A special key, formerly used by the management of a hotel or a rooming house, made by cutting away the bow and the top half of the key except for the tip which remains intact so that the lock’s pins will trap the tip of the lockout key and prevent insertion of any other key. Lockout keys were used against tenants with unpaid bills.

LOCK PICK – See pick.

LOCK PICKING – See picking.

LOCK READER – A tool made of stiff wire used to push the front tumblers of a lock out of the way so the locksmith can see the rear tumblers as he looks in a keyway to examine and compare tumblers in order to determine a disc tumbler lock’s combination. See also reading.

LOCKSET – A lock with all of its necessary fittings.

A Dictionary of Locksmithing 43 LOCKSMITH – A security expert who sells, installs, repairs and modifies locks and makes keys for them.

LOIDING – The shimming open of a springbolt with a thin piece of flexible material, such as a plastic card.

LOUVER – An opening in a door or a window with pivoting slats to allow passage of air.

LOWER PIN – See bottom pin.

MACE’S ROSE – A rose with a sleeve which extends out from the door to surround the neck of a knob attached to a Duce’s spindle.

MAGNETIC LATCH – A latch which is drawn into its strike by the force of magnets embedded both in it and in its strike, instead of by spring action.

MAID’S KEY – A master key which opens a specified number of hotel guest rooms, such as all the guest rooms on a floor, except when a door is locked by the guest from the inside. See also housekeeper’s key.

MAINTENANCE MASTER KEY – A master key set to control only certain cylinders in maintenance areas. See also engineer’s key.

MAISON KEYING – A system, the reverse of master keying, in which several keys work one lock, often used on entrance doors to apartment buildings. In maison keying master pins of many increments are used to allow many keys to open the same cylinder, with substantial loss of security.

MANDREL – Another name for an arbor.

MANIPULATION – The technique of discovering the combination of a combination lock by turning the dial and listening, often with the aid of an audio amplifier, for the faint noises of the moving parts, but without the use of other tools or of force. The locksmith is able to feel the parts engaging one another because their motion is transferred through the spindle to the dial and to his fingers.


combination lock with precisely machined parts and special lubriA Dictionary of Locksmithing cating coatings, such as Teflon, as well as special design features, to hinder discovery of the lock’s combination by manipulation. Also called manipulation-proof lock.

MASTER DISC TUMBLER – A disc tumbler with a special cut in the center slot to accept special key blanks for master keying. The master key and the change key each lift the tumbler at a different point in the tumbler’s slot.

MASTER KEY – A key which operates every lock in a group, whether keyed different or keyed alike. Each lock operated by a master key also has its own change key.

MASTER KEYED LOCK – A lock which has been combinated so that both its own change key and at least one master key will open it.

MASTER KEYING – The process of selecting the key changes for a series of locks and then setting up the tumblers of the locks so that at least one master key will open every lock in the group while only one change key will open each lock.

MASTER KEYING CHART – A chart which shows the master key combinations, and the change key combinations which they can control, for a master key system of a given size.

MASTER PIN – A small pin tumbler, flat on both ends, placed between the bottom pin and the top pin in a lock’s pin chamber to allow more than one key to work the lock. The extra pin creates an extra break between pins which allows a division at the shear line when the master key is used. Also called a master pin tumbler.

MASTER RING MASTER KEYING – The master keying of a specially designed cylinder by use of a special master ring which encircles the cylinder’s plug and provides a separate shear line at which the master pins line up when the master key is inserted in the lock keyway, increasing both security and the number of available changes.

MASTER WAFER – One of three types of wafer tumblers of a popular cylindrical lock made by the Schlage Lock Co., designed so that, as with the series wafers of this lock, when there is no key in A Dictionary of Locksmithing 45 the keyway, the master wafer stem sticks out of the plug to prevent the plug from turning. The master wafer differs from the three series wafers in having a smaller inner notch which requires a key cut at the tip of the key blade to permit full entry of the key into the keyway and full retraction of the master wafer stem into the plug. See also combination wafer, series wafer and wafer tumbler.

MESH CHANGE WHEEL – A type of combination lock hand change wheel for which the combination is changed by removing a geared inner ring from a geared outer ring and relocating them in different positions.

MILL BASTARD FILE – A medium course rectangular file, tapered both in thickness and in width from the middle to the point.

MILLING CUTTER – A key machine cutting wheel with both edges beveled to make a V-cut in cylinder keys. It is used on code cutting and heavy duty key machines. See also rotary file cutter, side milling slotter and slotting cutter.

MORTISE – A cavity or hole cut into a piece of wood, or other material, to hold another object, such as a lock.

MORTISE BOLT – A door bolt with a round body and a face plate, mortised into the edge of a door and operated by a handle or knob from the side of the door.

MORTISE CYLINDER – A cylinder, threaded on its outside circumference and supplied with a cam at its rear, to operate certain mortise door locks.

MORTISE LATCH – A latch installed inside a mortise in a door.

MORTISE LOCKSET – A lockset installed in a deep mortise cut into the edge of a door with the cylinder, if it has one, installed through a hole in the side of the door and threaded into the lock case. See also lock function.

MULLION – The center post between a pair of double doors. Also, the vertical dividers between window panes.

MULTIPLE KEY SYSTEM – A system of locks in which each keyway has individual barrel broaching and a key section for each A Dictionary of Locksmithing individual master key, with grand master keys milled to pass more than one broached keyway. Also called multiplex master keying.

MULTIPLE KEY SECTION SYSTEME– See key section series and multiple key system.

MULTIPLEX MASTER KEYING – Another name for multiple key system. See also key section series.

MUNTIN – A door or window member used to divide glass panels.

MUSHROOM DRIVER - See spool driver.

MUSHROOM PIN – See spool driver.

MUSHROOM TUMBLER – See spool driver. NECK - A knob shank.

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