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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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.

A

DICTIONARY

OF

LOCKSMITHING

By KEITH MAYERS

Keith A. Mayers

San Diego, CA

A Dictionary of Locksmithing

ii

.

NOTE:

The user will find information related to technical terms dened in this dictionary by following references given at the end

of the individual dictionary entries. Technical terms found in the

text of an entry are defined separately under their own individual entries. A careful search will provide a full picture of the meaning of a given term.

  Copyright c 1979 by Keith Mayers All Rights Reserved ISBN 0-9604860-0-3 Printed in the United States of America (Reprinted 1996) Keith A. Mayers San Diego, CA A Dictionary of Locksmithing iii.

The author thanks

MR. WALTER TIEDEMAN

Former Chief Instructor Locksmithing Institute of America for his careful reading of the manuscript and for his many valuable suggestions for the improvement of this dictionary.

A Dictionary of Locksmithing iv A Dictionary of Locksmithing 1 ACE LOCK – A high quality lock with pin tumbler chambers arranged in a circle instead of a straight line as they are in a standard cylinder. Ace locks use tubular keys and have a shear line parallel to the face of the lock. The name comes from the trade name of the most popular lock of this type. Also called tubular lock.

ACTIVE DOOR – Of a pair of double doors, the door which opens first and which holds the locking mechanism. Also called the active leaf.

ADJACENT KEY CUT – One of at least two key cuts which are next to each other on a key blade.

ANODIZING – The electrostatic depositing of a corrosion-resistant film of oxide on the surface of aluminum and its alloys, as in anodized keys.

ANTI-FRICTION LATCH – A special latch designed to reduce the pressure needed to push a door closed. A small trigger hits the strike ahead of the main portion of the latch and exerts lever action to retract the latch. Also called a swinging latch bolt.

ANTI-PICK LATCH – See deadlocking latch.

ANTI-SHIM SPRINGBOLT – Another name for deadlocking latch.

ANTI-THRUST BOLT - A springbolt on a night latch which cannot be pushed back into the latch once extended, although it can be retracted by the key or by the turn knob.

ANVIL – That stationary part of a key micrometer which fits into a key cut when it is measured. See also thimble, sleeve and spindle.

APARTMENT FUNCTION LOCK – A lockset in which inside knob works latchbolt, retracts deadbolt and releases stop button; outside knob works latchbolt unless locked by stop button or outside key; inside turnpiece and outside key work deadbolt.

ARBOR – A bar or shaft, usually threaded at one end, for holding cutting tools, such as hole saws, so they can be rotated in drills.

lathes and other machines.

ARMORED FACE PLATE – A double face plate, one plate of A Dictionary of Locksmithing which is a scalp to cover the mounting screws. Also called an armored front.

ARMORED FRONT – See armored face plate.

ASSOCIATED MASTER KEY – A master key related to a block of change keys which cannot be used with other master keys in a master key system without creating uncontrolled cross-keying.

ASTRAGAL – A molding to cover the gap between a pair of meeting doors.

ASYMMERRICAL DOUBLE WING KEY – A double wing key with each of its two bits cut differently so that it will work its lock only when inserted into its keyway in the one correct manner.

ATTENDANT’S KEY – Key symbol ATT. A selective master key used by attendants in mental institutions to lock and unlock patient rooms in various buildings under different master or grand master keys.

AUGER DRILL BIT – A drill bit, used in a brace, with deep spiral channels, for boring holes in wood; replaced for the most part by spade type and twist type drill bits used in electric drills.

AUXILIARY BOLT – The anti-thrust bolt of a deadlocking latch which automatically deadlocks the latchbolt when its door is closed.

AUXILIARY CYLINDRICAL LOCK – A door lock, with a bolt and either two cylinders or one cylinder and a thumb turn, designed with round housings so that drilled holes can replace mortises. Sometimes called a tubular deadlock.

AWL – A pointed instrument, usually with a handle, for punching small holes in soft materials like leather or wood, or for making scratch marks on harder materials.

BACK PLATE – The plate used to clamp a rim cylinder to a door.

Also called a retainer or retaining plate and, sometimes, a false back plate. The tailpiece passes through the back plate to transmit the turning motion of the key to the bolt. Also, a plate attached to the inside of a door to finish off a letter drop opening. Also, the plate A Dictionary of Locksmithing 3 which closes off the back of a night latch.

BACKSET – The distance from the edge of a lockset’s faceplate to the center of its keyway.

BALL CATCH – See friction catch.

BAR – That portion of a lever tumbler which is cut in two by the gate through which the fence passes from one pocket to the other.

BAR LOCK – A lock which secures one half of a sliding glass door or window by insertion of a steel bar horizontally across the nonoperating door to jam the sliding element of the door against the door frame.





BARREL – Another name for a cylinder plug. Also, the hollow shank section of a barrel key.

BARREL KEY – A bit key with a hollow shank, or stem, which fits on a post in a lock and positions the bit as it turns. Also called a hollow post key or a pipe key.

BARREL POST – A round pin fixed to a lock case to support a barrel key as it turns in the lock. Also called a drill pin.

BELLY – Another name for the lift radius of a lever tumbler.

BEVEL – See door bevel, lock bevel.

BEVELLED BOLT – See springbolt.

BEZEL NUT WRENCH – A double ended wrench used for removing a special nut on certain small locks, such as some automobile locks and some cabinet locks.

BICENTRIC CYLINDER – A cylinder with two plugs, often used in large, multi-level, high security master key systems. Bicentric cylinders usually have geared tailpieces connecting the two plugs.

The correct key in either cylinder will open the lock.

BIT – The section of a key which enters a lock, which has the key cuts formed in it and which engages the bolt or tumblers of the lock.

The bit is called a blade in the case of a cylinder key. See also drill bit.

BIT HEIGHT – The dimension of a bit from the post to the top edge of the bit, that is, to the edge most distant from the post of the A Dictionary of Locksmithing key. See also bit thickness and bit width.

BIT KEY – A key with a blade, called a bit, which projects from the side of a round shank near the tip and on which are made key cuts to clear the wards on a warded lock. Also called a wing key.

BIT KEY LOCK – A lock which uses a bit key; a warded lock.

BIT THICKNESS – The dimension of a bit which is smaller than the diameter of its post. See also bit height and bit width.

BITTING – A depth of key cut on a cylinder key, expressed as a number, called an equivalent. Also, the combination of key cuts on a bit key.

BITTING INCREMENT – See increment.

BIT WIDTH – The dimension of a bit which runs parallel to the post of the bit key. Since it is often the longest dimension of the bit, the bit width is sometimes erroneously called the length. See also bit height and bit thickness.

BLADE – The segment of a key which enters the keyway of a lock and has key cuts machined into it. On a bit key the blade is called a bit.

BLANK – An unfinished key as it comes from the manufacturer, with keyway grooves, in the case of cylinder keys, but without key cuts. Also called a key blank.

BLOCKING LEVER – See trap lever.

BODY PULLER – A tool for quickly removing automobile ignition locks from steering wheel columns when they have to be replaced and when damaging them is of no consequence. Also called a slapper.

BOLT – The part of a lock which slides part way out of the lock case to fasten the lock to its strike, shackle or other restraining member.

BOLT HEAD – The portion of a bolt which projects from a door lock into the door frame.

BOLT TAIL – The section of a bolt fixed to the bolt head which secures the bolt in its lock and which is usually notched for throwing and retracting the bolt.

A Dictionary of Locksmithing 5 BOLT WIRE – A bolt tail made of round rod.

BOND – An agreement under which an insurance company agrees to pay a customer for financial loss caused by a locksmith’s failure to perform a contract or by his negligence or error in judgment.

BONDED LOCKSMITH – A locksmith who has taken out an insurance policy to protect his customers financially from his mistakes.

BOND BOX – A removable metal box which fits inside a safe deposit box to hold the renter’s valuables.

BORING JIG – A guide for the accurate drilling of mortises for installing mortise locksets in doors. A good boring jig can be adjusted for door thickness and depth of mortise.

BOTTOM PIN – A cylinder pin tumbler, usually tapered or rounded at the lower end, with a length which corresponds to one of a lock’s bittings. The bottom pin occupies the lowest position in one of a cylinder’s pin chambers. The correct key lifts the bottom pins to the shear line so the plug can turn and open the lock. Also called the lower pin.

BOW – The handle, or head, of a key. On a cylinder key, that part beyond the shoulder which does not enter the keyway and by which the key is held and turned.

BOX OF WARDS – A complete, self-contained system of wards ready for installation in some locks and safes; popular in past centuries but no longer in use.

BOX STRIKE – A strike which is installed on the exterior of a door frame and which completely houses a lock’s bolt.

BRACE – A hand drill, made of steel rod with wood handles, curved like the outline of a top hat, used with auger and expansion bits for drilling large holes in wood and other soft materials. Electric drills have replaced braces for most commercial uses. Also, the steel bar of a brace lock.

BRACE LOCK – A door lock in which a cylinder and lock body mounted on a door controls a long steel bar, called a brace, which is anchored in a steel plate secured to the floor.

A Dictionary of Locksmithing BRASS – A yellow-colored alloy of copper and zinc, usually two parts copper to one part zinc. Brass is harder and stronger than copper but still malleable and ductile.

BRIDGE – The plate which supports the wards in some two side locks.

BRIDGE WARD – A type of ward used in two side locks, with a plate, called the bridge, fixed in the center of the lock on cheeks for support.

BROACH – The pin in a lock which enters the barrel of a barrel key.

Also, that part of the stem, or post, of a bit key which enters a socket to support the key as it turns.

BROACHING – A process of shaping an interior hole or slot in metal by pulling through the hole a toothed tool which scrapes away excess material. Broaching with locks is used primarily to form keyways.

BRONZE – An alloy of copper and tin. Usually ninety percent copper, bronze can be rolled and drawn. It is a common finish material on locks.

BUILDING MASTER KEY – A master key which opens most of the locks in a building.

BULLET – A side groove on the bit of a bit key, parallel to the post, cut into the key to clear a keyhole ward.

BULL NOSE EDGE – A door edge with a radius.

BURGLAR-PROOF – A description which means that entry into a secure area is virtually impossible without either explosives or unlimited time.

BURGLAR-PROOF GUARD RING - A ring of hardened steel installed around the head of a cylinder to prevent prying of the cylinder.

Also called a shield ring.

BURGLAR-PROOF SPINDLE - A tapered or shouldered spindle on a combination lock, either hardened or with hardened pin inserts to prevent punching, pulling or drilling.

BUTT HINGE – A rectangular hinge, one half of which is mortised A Dictionary of Locksmithing 7 into the edge of a door, the other half into the door jamb, so that both halves touch when the door is closed. Also called a butt BLOCKING LEVER - See trap lever.

BODY PULLER – A tool for quickly removing automobile ignition locks from steering wheel columns when they have to be replaced and when damaging them is of no consequence. Also called a slapper.

BOLT – The part of a lock which slides part way out of the lock case to fasten the lock to its strike, shackle or other restraining member.

BOLT HEAD – The portion of a bolt which projects from a door lock into the door frame.

BOLT TAIL – The section of a bolt fixed to the bolt head which secures the bolt in its lock and which is usually notched for throwing and retracting the bolt.

BOLT WIRE – A bolt tail made of round rod.

BOND – An agreement under which an insurance company agrees to pay a customer for financial loss caused by a locksmith’s failure to perform a contract or by his negligence or error in judgment.

BONDED LOCKSMITH – A locksmith who has taken out an insurance policy to protect his customers financially from his mistakes.

BOND BOX – A removable metal box which fits inside a safe deposit box to hold the renter’s valuables.

BORING JIG – A guide for the accurate drilling of mortises for installing mortise locksets in doors. A good boring jig can be adjusted for door thickness and depth of mortise.

BOTTOM PIN – A cylinder pin tumbler, usually tapered or rounded at the lower end, with a length which corresponds to one of a lock’s bittings. The bottom pin occupies the lowest position in one of a cylinder’s pin chambers. The correct key lifts the bottom pins to the shear line so the plug can turn and open the lock. Also called the lower pin.

BOW – The handle, or head, of a key. On a cylinder key, that part beyond the shoulder which does not enter the keyway and by which A Dictionary of Locksmithing the key is held and turned.

BOX OF WARDS – A complete, self-contained system of wards ready for installation in some locks and safes; popular in past centuries but no longer in use.



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