723:
22:
1281:
241:
78:
180:
1316:
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369:, or uncut, portion of the key that acts as a bolt throw will make contact with a bolt throw notch cut into the bolt. The other method is to use a trunnion with a talon built on the bottom of it. In both instances, when the key is turned contact is made with the bolt throw notch of the bolt, which allows it to be retracted.
98:(usually made out of non-ferrous metals). Each lever needs to be lifted to a specific height by the key in order for the locking bolt to move. Typically, the belly of the lever is cut away to various depths to provide different combinations, or the gate is cut in a different location, to provide differs. A lever will have
371:
Different types of lever locks have different tumbler designs. lever with one gate on the obstruction built onto the face or front of the tumbler and its tumbler trap to lock the bolt into either the locked or unlocked position. of lever tumbler a front and rear gate to trap the bolt into either
158:
and often recommended by the police for home security. There are various grades but the current
British Standard (BS3621:2007) is usually required for insurance purposes. Locksmith Valerie Olifent states that, "The doors of many historic churches still carry an old wooden lock although often you find
121:
There has not always been universal agreement about which variants of the basic design merit the terms "lever lock" or "detainer lock" or both. Some authors use the term "detainer lock" to refer specifically to variants where the gates are "open" (i.e. at the edge of the lever), rather than "closed"
342:
Lever tumbler locks are built and operate much differently than the conventional and more popular pin tumbler lock. Although they have their place in high-security applications, such as safe deposit boxes with a double-set tumbler design, they are used mostly for applications that allow a more
347:
In a basic, fixed, lever tumbler lock design, the entire lock is enclosed in a case... The simple lever lock has three or more lever tumblers that pivot on a post and are pushed into the 'locking' position by springs, which are bound against the case and attached to the tail end of each lever
362:
In other lever lock designs, a post is connected directly to the bolt. With the lever tumbler lock, when the tumblers are raised to the proper position the post of the bolt will pass through the front gating to the rear gating and hold the bolt in the retracted
141:
is a common type of lever lock, but is generally used for low security applications such as internal doors as their tolerances are much lower (there are fewer combinations of key available, so they are likely to unlock doors they shouldn't).
40:
The number of levers may vary, but is usually an odd number for a lock that can be opened from each side of the door in order to provide symmetry. A minimum number of levers may be specified to provide an anticipated level of security
61:
of
England. These required the lever to be lifted to a certain height by having a slot cut in the lever, so lifting the lever too far was as bad as not lifting the lever far enough. This type of lock is still used today, on doors in
260:
Higher security lever locks (such as the five-lever) usually have notches cut into the levers. These catch the locking bolt and prevent it from moving if picking is attempted (similar to the security pins in a
159:
that a modern 5-lever mortice lock has been installed alongside it to meet insurance requirements." BS3621:2007 requires a bolt throw of 20 mm rather than the 14 mm of the earlier
British Standard.
256:
which is inserted into the keyway of the lock, and a force is applied to the locking bolt. The pick is then used to lift each lever inside the lock to the correct height so that the locking bolt can pass.
37:
that uses a set of levers to prevent the bolt from moving in the lock. In the simplest form of these, lifting the tumbler above a certain height will allow the bolt to slide past.
378:, others have false gates. These varying designs make it more difficult to pick a lever tumbler lock. Lever tumblers with false gates usually are reserved for high-security units.
583:
360:. When all the tumblers are in this position, the fence can be thrown through each tumbler's gate, which pushes the bolt into the retracted position.
571:
2 & 3 lever mortice locks are generally only recommended for use on internal doors as they do not provide adequate levels of security externally
637:
275:
Lever locks can be drilled, but usually a template or stencil is required to mark the drilling point, as the lock mechanism is commonly
201:
1307:
550:
523:
496:
454:
227:
1341:
343:
lenient state of security. Today, they are used mostly for mailboxes, luggage, lockers, and other light security applications...
413:
129:. Some locks used on safes use a double-bitted key, as do some door locks of a type often used in Southern and Eastern Europe.
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335:
205:
1160:
1139:
886:
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471:
345:
Their biggest disadvantage, however, is that they do not allow for as many master-key combinations as pin tumbler locks.
486:
1241:
1231:
190:
630:
209:
194:
1099:
348:
tumbler. When the proper key is inserted into the lock and turned, it raises each tumbler to the point where the
58:
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34:
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269:
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608:
21:
1236:
963:
856:
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450:
365:
There are two different ways that the lever lock bolt can be thrown. In some lever locks, the
331:
1295:
126:
1149:
1008:
876:
851:
272:
is a variation of the lever lock which was designed to detect and prevent picking attempts.
262:
1246:
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687:
421:
1319:
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166:, along with hardened bolts and anti-drill plates to reduce risk of physical attack.
71:
446:
A Study of
Surface-Mounted Door Locks from a Number of Archeological Sites in Canada
240:
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1038:
998:
948:
932:
825:
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654:
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542:
LOCKS, SAFES, AND SECURITY: An
International Police Reference Two Volumes (2nd Ed.)
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82:
77:
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179:
1129:
978:
810:
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891:
830:
747:
162:
Most BS3621 locks have anti-pick devices built in to reduce the chance of
1190:
1061:
988:
820:
782:
752:
712:
702:
871:
815:
767:
762:
1134:
472:"A Treatise on Fire and Thief-proof Depositories, and Locks and Keys"
67:
63:
993:
239:
76:
619:
584:"Insurance company requirements | The Crime Prevention Website"
279:
and so it is harder to determine the point at which to drill.
173:
57:"Double acting" lever tumbler locks were invented in 1778 by
609:
http://www.buildingconservation.com/articles/locks/locks.htm
85:. The faceplate has been removed to see the inner workings.
515:
High-Security
Mechanical Locks: An Encyclopedic Reference
474:. Simpkin, Marshall and Company – via Google Books.
252:
Lever tumbler locks can be picked with a tool called a
1219:
1070:
1037:
941:
910:
839:
803:
730:
665:
356:of each tumbler, which also blocks each tumbler's
352:of the lock's bolt can clear the obstruction or
374:Some lever tumblers have serrated saddles, or
631:
8:
208:. Unsourced material may be challenged and
25:Animation of a lever tumbler lock mechanism
638:
624:
616:
81:A five-lever lock which is designed to be
317:
315:
313:
228:Learn how and when to remove this message
122:(i.e. entirely surrounded by the lever).
20:
449:. National Historic Parks & Sites.
324:Locksmithing: From Apprentice to Master
309:
443:Priess, Peter J. (26 September 1979).
539:Tobias, Marc Weber (1 January 2000).
44:
7:
1303:
1291:
206:adding citations to reliable sources
607:"The Ancient Art of the Locksmith"
512:Pulford, Graham (17 October 2007).
74:and some other parts of the world.
14:
1314:
1302:
1290:
1280:
1279:
721:
488:The Encyclopaedia for Locksmiths
412:Bellis, Mary (8 November 2011).
248:used to pick lever tumbler locks
178:
1227:Glossary of locksmithing terms
545:. Charles C Thomas Publisher.
1:
1161:Perimeter intrusion detection
588:thecrimepreventionwebsite.com
1140:Miniature snap-action switch
887:Time-delay combination locks
125:Lever locks generally use a
1242:John M. Mossman Lock Museum
1232:Electromagnetic door holder
420:. About.com. Archived from
42:
1358:
118:) moves during unlocking.
1275:
1100:Closed-circuit television
719:
555:– via Google Books.
528:– via Google Books.
518:. Butterworth-Heinemann.
501:– via Google Books.
459:– via Google Books.
106:) through which the bolt
984:Kensington Security Slot
897:Tubular pin tumbler lock
322:Rathjen, Joseph (1995).
1342:Locks (security device)
1201:Vandal-resistant switch
1155:Passive infrared sensor
1085:Alarm monitoring center
882:Rotary combination lock
731:Components and hardware
491:. Authors On Line Ltd.
393:. London Locksmiths Ltd
94:The lock is made up of
45:§ Five-lever locks
1257:Lock Museum of America
773:Bored cylindrical lock
470:Price, George (1856).
414:"The History of Locks"
391:"The history of locks"
277:mortised into the door
249:
154:is often required for
86:
26:
1285:Category:Locksmithing
1196:Ultrasonic transducer
485:Friend, Mick (2004).
243:
80:
24:
1166:Photoelectric sensor
1120:Glass break detector
1019:Real-estate lock box
918:Electromagnetic lock
790:Single-point locking
743:Interchangeable core
666:Fundamental concepts
567:"Lockshop Warehouse"
202:improve this section
83:mortised into a door
1262:Musée de la Serrure
1115:Fingerprint scanner
1024:Steering-wheel lock
959:Chubb detector lock
867:Magnetic keyed lock
795:Three-point locking
418:About.com Inventors
270:Chubb detector lock
902:Wafer tumbler lock
862:Lever tumbler lock
330:. pp. 90–93.
250:
87:
31:lever tumbler lock
27:
1329:
1328:
1237:Exit control lock
964:Child safety lock
857:Disc tumbler lock
708:Physical security
238:
237:
230:
133:Three-lever locks
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1318:
1306:
1305:
1294:
1293:
1283:
1282:
1150:Occupancy sensor
1009:Power door locks
942:Other lock types
911:Electronic locks
877:Combination lock
852:Pin tumbler lock
840:Mechanical locks
725:
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263:pin tumbler lock
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146:Five-lever locks
139:three-lever lock
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1247:Key to the City
1215:
1211:Window security
1176:Pressure switch
1145:Motion detector
1072:Security alarms
1066:
1033:
937:
928:Electric strike
923:Electronic lock
906:
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799:
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688:Key duplication
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659:security alarms
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170:Vulnerabilities
152:five-lever lock
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1206:Water detector
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1181:Proximity card
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1014:Protector lock
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678:Authentication
675:
673:Access control
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424:on 30 May 2012
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218:September 2018
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156:home insurance
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1220:Miscellaneous
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698:Master keying
696:
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693:Key relevance
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552:9780398083304
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525:9780080555867
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498:9780755201174
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456:9780660101804
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187:This section
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72:South America
69:
65:
60:
59:Robert Barron
52:
50:
46:
38:
36:
33:is a type of
32:
23:
19:
1313:
1301:
1289:
1171:Piezo switch
1080:Alarm device
1047:Lock bumping
1039:Lock picking
999:Luggage lock
949:Bicycle lock
933:Keycard lock
861:
826:Skeleton key
778:Mortise lock
758:Key retainer
655:lock picking
651:locksmithing
603:
591:. Retrieved
587:
578:
570:
561:
541:
534:
514:
507:
487:
480:
465:
445:
438:
426:. Retrieved
422:the original
417:
407:
395:. Retrieved
385:
375:
366:
357:
353:
349:
341:
323:
299:Lock picking
294:Mortise lock
274:
267:
259:
254:curtain pick
253:
251:
224:
215:
200:Please help
188:
164:lock picking
161:
151:
149:
138:
136:
124:
120:
115:
111:
107:
103:
99:
95:
93:
56:
39:
30:
28:
18:
16:Type of lock
1267:Puzzle lock
1252:Lock Museum
1186:Reed switch
1095:Card reader
1004:Night latch
954:Bramah lock
847:Warded lock
683:Key control
328:McGraw-Hill
289:Warded lock
1130:Key switch
979:Door chain
811:Berlin key
428:8 November
397:8 November
337:0070516456
305:References
244:A type of
127:bitted key
1110:Dual loop
1090:Car alarm
1052:Locksport
974:Dead bolt
969:Crash bar
892:Time lock
831:Smart key
748:Key blank
372:position.
363:position.
246:lock pick
189:does not
1336:Category
1191:Tripwire
1062:Snap gun
1057:Slim Jim
1029:The Club
989:Knox Box
821:Keychain
783:Rim lock
753:Key code
713:Rekeying
703:Password
593:13 March
283:See also
872:Padlock
816:Car key
768:Lockset
763:Lockrod
738:Bitting
376:bellies
210:removed
195:sources
100:pockets
53:History
1135:Keypad
657:, and
549:
522:
495:
453:
334:
96:levers
90:Design
68:Africa
64:Europe
1308:Locks
1157:(PIR)
994:Latch
647:Locks
350:fence
116:fence
108:stump
104:gates
43:(see
1320:Book
1296:Keys
804:Keys
595:2016
547:ISBN
520:ISBN
493:ISBN
451:ISBN
430:2011
399:2011
358:gate
354:face
332:ISBN
268:The
193:any
191:cite
112:post
110:(or
102:(or
35:lock
367:end
265:).
204:by
114:or
1338::
653:,
649:,
586:.
569:.
416:.
340:.
326:.
312:^
150:A
137:A
70:,
66:,
49:.
29:A
639:e
632:t
625:v
597:.
432:.
401:.
231:)
225:(
220:)
216:(
212:.
198:.
47:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
