WO1993018255A2 - Serrure a barillet - Google Patents

Serrure a barillet Download PDF

Info

Publication number
WO1993018255A2
WO1993018255A2 PCT/GB1993/000433 GB9300433W WO9318255A2 WO 1993018255 A2 WO1993018255 A2 WO 1993018255A2 GB 9300433 W GB9300433 W GB 9300433W WO 9318255 A2 WO9318255 A2 WO 9318255A2
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
cylinder lock
void
pin
inner rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1993/000433
Other languages
English (en)
Other versions
WO1993018255A3 (fr
Inventor
Jonathan Nettlefold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU35732/93A priority Critical patent/AU3573293A/en
Publication of WO1993018255A2 publication Critical patent/WO1993018255A2/fr
Publication of WO1993018255A3 publication Critical patent/WO1993018255A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B27/00—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in
    • E05B27/0003—Details
    • E05B27/0007—Rotors
    • E05B27/001—Rotors having relatively movable parts, e.g. coaxial- or split-plugs

Definitions

  • a pin tumbler lock includes a core housing or stator, having an internal pin tumbler mechanism, and a cylindrical plug or rotor within the stator that has a keyway for receiving a key.
  • the key is notched to cooperate with the stator's pin tumbler mechanism, in such a way that when the correct key is inserted rotation of the plug within the stator is enabled, so rotating a throw bar which is attached to the rear end of the plug. The throw bar then normally unlatches the door or other structure which is being secured by the lock.
  • the pin tumbler lock has a number of short comings. In its most basic form, it is susceptible to picking or to excessive force. Many locks have been developed in an effort to combat these shortcomings. Methods of deterring picking include the provision of false break points in the tumblers (for example as is shown in GB-A-1590090, and in GB 2222201) . Conventional methods of preventing forcing generally concentrate upon strengthening the system, for example by increasing the number of pins, strengthening the pins and so.
  • a cylinder lock comprising a lock housing, an outer rotor mounted within the housing for rotation between a locked position and an unlocked position; an inner rotor, having a keyway for reception of a key, mounted within the outer rotor; and a plurality of biased tumbler pin assemblies extending through the outer rotor, each pin assembly having a break line whereby when a correct key is inserted into the keyway the pin assemblies split at the break lines to permit the outer rotor to rotate, as a unit with the inner rotor, to the unlocked position; and when an incorrect key is inserted, and force is applied, the inner rotor is arranged to rotate within the outer rotor, the outer rotor remaining stationary.
  • the outer rotor or outer shell comprises a hollow cylinder having tumbler bores. Attached at the rear end of the outer rotor is a throw bar. Within the outer rotor ,is a cylindrical plug, plug keyway or inner rotor which defines a keyway for receiving a key, the notched edge of which is in contact with the inner surface of the outer rotor and is arranged to operate tumbler assemblies which are movable in tumbler bores formed in the housing and in the outer rotor to allow rotation of the throw bar.
  • the inner rotor is held in position in the outer rotor by means of friction or a relatively weak shearing material, so that in normal operation the inner and outer rotors move together as one unit.
  • the outer surface of the inner rotor is shaped so that if the wrong key or another implement is used to rotate the inner rotor forcibly, the inner rotor will turn independently of the outer rotor and the housing, protecting the tumblers from shearing. As the inner rotor rotates, the outer rotor is held stationary, and accordingly the throw bar cannot be operated.
  • a cylinder lock comprising a housing, a rotor mounted within the housing for rotation between a locked position and an unlocked position, the rotor having a keyway for reception of a key; a plurality of biased tumbler pin assemblies extending between the housing and the rotor and preventing rotation of the rotor unless a correct key is inserted into the keyway, each pin assembly having a true breakpoint whereby when a correct key is inserted each pin assembly splits at its respective true breakpoint to permit the rotor to be rotated to its unlocked position; at least one tumbler assembly having a false breakpoint; and a void in the rotor or in the housing shaped for reception, under the biasing force, of a pin assembly which has been split at a false breakpoint, but not a pin assembly which has been split at its true breakpoint, reception of a pin assembly within the said void preventing rotation of the rotor to the unlocked position.
  • This system which allows the rotor to discriminate between primary and secondary breakpoints, may be used in locking systems with a one part rotor, so simplifying construction.
  • Other antipick systems generally require both an inner rotor and a separate outer rotor or outer sleeve.
  • each of the pin tumblers are provided with at least one secondary breakpoint, allowing the outer rotor to be rotated when all the tumblers are aligned with either primary or secondary breakpoints along the shear line between the housing and the outer rotor.
  • the section of each tumbler remaining in the housing is held against the outer surface of the rotor by means of the tumbler assembly spring.
  • the cross-section of the tumbler at the point at which it is held against the rotor is shaped so as to have a smaller cross-sectional area in comparison with the corresponding cross-sectional area at the primary breakpoint of the tumblers.
  • the section of the tumbler with the lesser cross- sectional area relocates in a secondary bore drilled in the rotor which prevents any further rotation. If, on the other hand, the tumbler is aligned at the primary breakpoint, the cross-sectional area of the tumbler at that point is larger than that of the secondary bore, so that the forward edge of the tumbler simply passes over the secondary bore, effectively ignoring it, and allowing the rotor to continue to rotate.
  • the grooves in the inner rotor be fully circumferential and deep enough so as not to interfere with the section of the tumbler which protrudes from the tumbler bore in the outer rotor when the tumbler is split at its secondary breakpoint and so is received into the secondary bore. This ensures that the antiforce feature still remains operational after an attempt has been made to pick the lock.
  • Figure 1 is a longitudinal section through a cylinder lock embodying the present invention, and incorporating both the antipick and antiforce features;
  • Figure 2 is a transverse section through the lock of Figure 1;
  • Figure 3 is a transverse section, corresponding to Figure 2, of an alternative embodiment
  • Figure 4 is a further transverse section, corresponding to Figures 2 and 3 , of another alternative embodiment incorporating only the antiforce feature;
  • Figure 5 is a schematic view of the external surface of the rotor, showing the possible relative shapes and positions of the primary and secondary bores in the rotor, for use in embodiments incorporating the antipick feature;
  • Figure 6 shows a cross section of an alternative embodiment, incorporating the antiforce feature, in which the inner rotor is * provided with one extended groove instead of one groove for each tumbler;
  • Figure 7 is a transverse section, corresponding to Figures 2 to 4, of yet another embodiment, incorporating the antipick feature, in which the secondary bore is placed in the lock casing rather than in the rotor;
  • Figure 8 is a longitudinal section of a final embodiment, incorporating the antiforce feature, in which the inner rotor comprises a plurality of disks.
  • Figures 1 and 2 show a preferred embodiment of the invention incorporating both the antiforce and antipick features.
  • the embodiment shown in Figures 1 and 2 comprises a core assembly or rotor 40 retained within a lock outer casing 10 which also houses a plurality of tumbler assemblies, generally indicated at 54.
  • the lock case 10 has a generally cylindrical portion 10a having relatively thin walls, in which the rotor is received via an o f- centre rearward opening.
  • the casing 10 also has a moulded downwardly-extending lobe 10b which contains the plurality of tumbler assemblies 54.
  • the rotor in this embodiment comprises an outer cylindrical shell portion or outer rotor 20 and a core plug or inner rotor 30.
  • the inner rotor defines a longitudinally extending keyway 33.
  • the lobe 10b of the lock casing 10 has within in a plurality of vertical tumbler bores 11, which are arranged to be alienable with corresponding bores 21 in the outer rotor 20.
  • Each composite ironed bore 11,21 contains one of the tumbler assemblies 54.
  • Each tumbler assembly 54 comprises a shaped operating pin 13, a stack of tumbler pins generally indicated at 14, a biasing spring 53 and a bore closure plug 52.
  • the plug 52 is sized to provide a forced fit at the lower end of the-bore so securing the assembly 54 in place.
  • the inner rotor 30 differs from conventional rotors in that it has no tumbler bores, but instead is cut with a plurality of deep transverse grooves 31 around its circumference, each groove 31 being aligned with the tumbler bores 11,21.
  • the keyway 33 is shaped so as to guide the key along the inner surface of the outer rotor 20, so pressing down on the shaped operating pins 13.
  • the key is kept on track by a longitudinal groove (not shown) which runs rearwardly through the slightly off-centre core of the inner rotor 30.
  • the inner rotor 30 is held within the outer rotor 20 preferably by means of a friction fit, although it could alternatively be held in place by means of a relatively weak shearing material.
  • FIG. 4 An alternative embodiment, shown in Figure 4, is particularly desirable where the antiforce feature is to be used independently of the antipick feature. (Which will be described in more detail below) .
  • the grooves 31 do not extend all the way round the circumference of the inner rotor 30, but instead they are shaped in such a way that when the inner rotor 30 rotates in relation to the outer rotor 20, the edges of the grooves 31 bear upon the operating pins 13 to push the pins down into the bores 33 of the outer rotor 20. This then allows free rotation of the inner rotor 30.
  • the individual grooves for each of the assemblies 54 may be replaced by one single groove 30,31a, as shown in Figure 6.
  • the single groove 31a encloses all of the operating pins 13.
  • the key is kept on track by the longitudinal groove (not shown) which runs rearwardly through the slightly off- centre core of the inner rotor.
  • the inner rotor 30 could comprise a series of disks 34, grooved (not shown) to allow passage of the key.
  • Each individual disk 34 would be held in position within the outer rotor 20 by means of friction, or by means of a weak shearing material. If am attempt were to be made to force the lock using an incorrect key, the individual disks 34 would all rotate together, independently of the outer rotor 20, by virtue of their all being held together by the key.
  • the front of the lock would be suitably armoured to prevent removal of the front disk.
  • a standard pin tumbler lock may be picked by the method of progressively ascertaining the breakpoints of the individual tumblers, so that eventually the correct combination is achieved and the rotor may be turned.
  • each of the tumbler assemblies 54 is provided with a plurality of pins so as to provide a plurality of breakpoints. Only one of these breakpoints is the true, or primary breakpoint 57 - the remainder being false or secondary, breakpoints 58.
  • the breakpoints are so designed that, while the lock is being picked, it is difficult to ascertain whether a primary or a secondary breakpoint has been selected. Unless the person picking the lock manages to select each of the individual primary breakpoints, the lock will not operate. The method whereby this is achieved will now be described.
  • That portion of the tumbler which is immediately behind the primary breakpoint is held against the outer surface of the outer rotor 20, as the outer and inner rotor (the core assembly)rotates. That portion which is above the primary breakpoint 57, of course remains within the core assembly 40 and rotates with it.
  • a person who has picked the lock may have inadvertently have selected one or more of the secondary breakpoints 58, rather than the primary breakpoints 57, and in that event it will be appreciated that it will be that portion of the tumbler assembly 54 behind the secondary breakpoint 58 which is biased by the spring 53 against the outer rotor 30 as the core assembly 40 rotates.
  • the cross-sectional area of the tumbler immediately below a primary breakpoint is greater than that immediately below one of the secondary breakpoints.
  • the portion of the pin assembly immediately below a secondary break point is of a flattened oval shape, so that on its long axis (perpendicular to the page in Figure 1) it fits snugly into the bore 21. If one of the secondary breakpoints has been selected, the core assembly 40 will rotate only for a certain distance before that part of the assembly 54 behind the secondary breakpoint 58 slots into a secondary blind bore 23 ( Figure 2) in the outer rotor 20.
  • any reduction in cross- sectional area at the secondary breakpoints, as compared with the primary breakpoints, should be effected along the longitudinal axis.
  • a person attempting to pick the lock by inserting a tool along the longitudinal axis will be presented effectively with a similar apparent cross-section both for those parts of the assembly 54 immediately behind the primary breakpoints 57, and immediately behind the secondary breakpoints 58.
  • the difference in cross-section which is quite clearly visible in Figure 1, will not be at all visible to a person attempting to gain access in a longitudinal direction, via the keyway 33.
  • FIG 3 shows an alternative embodiment of the lock in which, after an attempted security breach, the lock can be returned to the position in which all the tumbler bores 11,21 are in alignment.
  • This is achieved by providing a camming surface 23a on the entry side of the secondary bores 23, tapering back towards the tumbler bores 21, so that when it is attempted to turn the rotor back to realign the tumbler bores, the tumblers are forced to retract into the housing bores 11,21 until the tumbler bores realign, when the tumblers will reset into the locked position.
  • Figure 7 shows yet another embodiment in which a weak counterspring 61 is placed within the outer rotor 20, in such a way as to exert an outward pressure on the portion of the tumbler remaining in the outer rotor 20 once that portion has been rotated away from the stronger regime of the assembly biasing spring 53. Any secondary points on the shear line would then insert the tumblers into secondary bores 23b situated in the lock housing 10.
  • the secondary bores 23b could either have shear or sloping edges, and there could either be one bore through each of the tumbler assemblies 54, or there could be one longitudinal groove of an appropriate width.
  • the antipick feature is used independently of the antiforce feature, there is of course no need to have a rotor of two-part form 20,30. Instead, a single, integral rotor (not shown) may be used.

Landscapes

  • Lock And Its Accessories (AREA)

Abstract

Une serrure à barillet comprend un rotor extérieur (20) susceptible d'être mis en rotation lorsqu'une pluralité d'ensembles de goupilles (54) sont dans leur position correcte, faisant tourner un pêne (22) qui déverrouille une porte ou autre élément assujetti par la serrure. Si l'on force la serrure, par exemple par mise en rotation d'une fausse clé, un rotor intérieur (30) ne fait que tourner de manière inoffensive à l'intérieur du rotor extérieur stationnaire (20). Les goupilles d'actionnement (13) des ensembles de goupilles (54) ne sont pas endommagées car elles sont montées dans des gorges circonférentielles (31) du rotor intérieur (30). Le mode préféré de réalisation comprend également un mécanisme anti-crochetage qui, lorsqu'un des ensembles de goupilles (54) est crocheté à un point de rupture secondaire ou erronné (58), force ledit ensemble au moyen d'un ressort de sollicitation (53) à entrer dans un passage secondaire (23) lorsque le rotor extérieur (20) est mis en rotation et met ainsi la serrure hors service. Si l'ensemble de goupilles (54) est fendu à un point primaire ou correct (57), toutefois, étant donné que la superficie de la goupille est plus grande à ce point, elle ne peut pas pénétrer dans le passage (23) lorsque le rotor extérieur (20) est mis en rotation, ce qui permet de faire tourner le rotor jusqu'à sa position de déverrouillage.
PCT/GB1993/000433 1992-03-06 1993-03-03 Serrure a barillet Ceased WO1993018255A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35732/93A AU3573293A (en) 1992-03-06 1993-03-03 Cylinder lock

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9204942A GB2264977B (en) 1992-03-06 1992-03-06 Cylinder lock
GB9204942.8 1992-03-06

Publications (2)

Publication Number Publication Date
WO1993018255A2 true WO1993018255A2 (fr) 1993-09-16
WO1993018255A3 WO1993018255A3 (fr) 1994-03-17

Family

ID=10711654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000433 Ceased WO1993018255A2 (fr) 1992-03-06 1993-03-03 Serrure a barillet

Country Status (2)

Country Link
GB (1) GB2264977B (fr)
WO (1) WO1993018255A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103132801A (zh) * 2011-11-22 2013-06-05 赖文坤 三合一结构防盗锁芯

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2117507B1 (es) * 1994-08-01 1999-02-16 Sistemas & Tec Seguridad Dispositivo de seguridad antigiro para cerradura de llave.

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB112761A (en) * 1917-11-01 1918-01-24 Eli Epstein Improvements in and relating to Cylinder Locks.
US1417132A (en) * 1921-04-09 1922-05-23 Yale & Towne Mfg Co Pin-tumbler lock
US1785634A (en) * 1927-05-27 1930-12-16 Yale & Towne Mfg Co Cylinder lock
US2596720A (en) * 1950-08-14 1952-05-13 Pastor Aldo Ferro Cylinder lock
DE1111056B (de) * 1959-07-18 1961-07-13 Martin H Blancke Zylinderschloss mit mehreren Schliessungen
US3349588A (en) * 1966-06-28 1967-10-31 New England Lock And Hardware Cylinder locks
DE2038039A1 (de) * 1970-07-31 1972-02-10 Josef Voss KG, 5040 Bruhl Schließzylinder
US3943739A (en) * 1974-04-03 1976-03-16 Genakis Joseph M Pin tumbler lock
US4380163A (en) * 1981-09-08 1983-04-19 Reder Kenneth J Tamper-resistant lock
CH676618A5 (fr) * 1988-08-27 1991-02-15 Bauer Kaba Ag
DE9004190U1 (de) * 1990-04-10 1990-06-21 Aug. Winkhaus GmbH & Co KG, 4404 Telgte Schließzylinder
US5060494A (en) * 1990-07-13 1991-10-29 Moorhouse John H Cylindrical lock structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103132801A (zh) * 2011-11-22 2013-06-05 赖文坤 三合一结构防盗锁芯
CN103132801B (zh) * 2011-11-22 2015-12-09 赖文坤 三合一结构防盗锁芯

Also Published As

Publication number Publication date
GB2264977A (en) 1993-09-15
GB9204942D0 (en) 1992-04-22
WO1993018255A3 (fr) 1994-03-17
GB2264977B (en) 1995-05-10

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