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EP0663498B1 - Cylinder lock - Google Patents

Cylinder lock Download PDF

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Publication number
EP0663498B1
EP0663498B1 EP95100397A EP95100397A EP0663498B1 EP 0663498 B1 EP0663498 B1 EP 0663498B1 EP 95100397 A EP95100397 A EP 95100397A EP 95100397 A EP95100397 A EP 95100397A EP 0663498 B1 EP0663498 B1 EP 0663498B1
Authority
EP
European Patent Office
Prior art keywords
core
housing
key
ring
pin
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.)
Expired - Lifetime
Application number
EP95100397A
Other languages
German (de)
French (fr)
Other versions
EP0663498A1 (en
Inventor
Stephan Krämer
Andreas Budich
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 EP97121318A priority Critical patent/EP0835975B1/en
Publication of EP0663498A1 publication Critical patent/EP0663498A1/en
Application granted granted Critical
Publication of EP0663498B1 publication Critical patent/EP0663498B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E05B27/0032—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in with both axially and radially arranged tumbler pins or balls

Definitions

  • the invention relates to a locking cylinder, whose core rotatable in the housing radially to one Key channel has adjacent sliding core pins that with spring-loaded housing pins when actuated with a key cut in the sense of a Release a rotational movement of the core cooperate, and which has at least one further blocking part in its core, with the key in the opposite direction a spring force from a locked position with locking engagement is adjustable in a rotational release position in which the housing has an annular groove, the freedom of movement for is the rotating locking part, the annular groove of the Housing is arranged outside its pin area, and the locking part can be acted upon with the key tip is.
  • a lock cylinder with the features mentioned above is known from DE-C-10 55 996.
  • the invention has for its object a locking cylinder to improve with the features mentioned at the beginning, that he has greater security against the use of offers wrong keys without sacrificing functional reliability of conventional pin tumblers.
  • the locking part as Pin one formed in the axial end region of the housing axially acting tumbler is formed, which is a radial Dividing plane, which is between a fixed to the core, core ring projection provided with a key channel extension and a housing-fixed ring, the tumbler from a in the core ring projection in the area of the key channel continuation held axially by the key tip sliding core ring pin and one in the housing-fixed Ring axially displaceable pin-like locking part is made.
  • the locking part of a conventional design of a lock cylinder can be optimally adjusted without or having to intervene in the key channel area.
  • the torsion of the core in the housing as a result of Axially acting tumbler located outside the pin area possible.
  • the components having the locking part can be designed as a compact unit that is non-rotatable is arranged in the housing and with the core or its radial Core ring projection interacts.
  • the locking cylinder is designed that the locking part of the key with a core ring pin is adjustable in its rotational release position. It is then not necessary, the actuation of the locking part Serve key directly on the locking part to let what because of the mostly specific training of the Leading the key to increased constructive effort could. Rather, a core ring pin is used, which in its Function corresponds to the conventional core pins, so that the key varies according to security requirements can be adapted.
  • the lock cylinder 10 shown in the figures has a housing 11 with a housing bore in which a core 12 is rotatably arranged.
  • the housing 11 is for a double cylinder determined and accordingly with a middle between the two housing halves arranged groove for a not shown Fitted with a mustache.
  • the core 12 is with a Key rotatably adjustable into a key channel 13 can be inserted. Vertical to the key channel 13 are in the Level core pins in corresponding holes in core 12 and housing pins in corresponding bores of the housing 11 arranged.
  • the pins are on abutment pins fixed to the housing supported springs are spring-loaded and form pin tumblers, which effectively prevent the core 12 from twisting, if not from the incised key against their spring load with an incision in the only predetermined position are shifted in which the Parting plane of the pins coincides with the outer circumference of the core 12. In this case, they prevent rotation adjustment of core 12 not.
  • the Locking part 17 ' is designed as a longitudinally adjustable pin, the key-displaceable in a lock ring 35 fixed to the housing is arranged.
  • the locking ring 35 is in one Housing bore 36 arranged, the outer diameter of which Corresponds to the annular groove 19 for the radial core ring projection 20.
  • mounting pins 44 are provided which the housing 11 firmly connect with the locking ring 35.
  • the lock ring 35 has a bore 34 which with the for Key shoulder of the key 16 specific area of the Key channel 13 is aligned and the inclusion of the spring 25 serves, on the one hand on an abutment pin and on the other is supported on the locking part 17 '. If the core ring projection 20 in the rotational position shown in Fig.1 is, the locking part 17 'in a recess 20' of the Core ring projection 20 and thus prevents twisting this core ring projection 20. The locking part 17 'moves a core ring pin in the position shown in Figure 1.

Landscapes

  • Lock And Its Accessories (AREA)
  • Fluid-Damping Devices (AREA)
  • Chairs Characterized By Structure (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)
  • Actuator (AREA)
  • Pens And Brushes (AREA)

Abstract

The lock cylinder has a core, which is rotatably movable in a lock housing (11) and core pins, which are slightly movable radially to key channel. The core pins work in conjunction with spring-loaded housing pins by operation with a suitably cut key (16) in the sense of freeing a rotary movement of the core (12). At least one further stop part (17) in the core can be adjusted from a stop position with radial stop engagement to a rotary freeing position. The stop part, which is arranged outside an area of the core pins, is freely movable in a ring groove in the housing (19). The stop part is arranged near to the key channel (13) and has an adjustment pin (23), which engages in the key channel through a longitudinal slot (24), to allow movement of the stop part.

Description

Die Erfindung bezieht sich auf einen Schließzylinder, dessen im Gehäuse drehbeweglicher Kern radial an einen Schlüsselkanal angrenzende verschiebliche Kernstifte hat, die mit federbelasteten Gehäusestiften bei Betätigung mit einem stiftseitig geeignet eingeschnittenen Schlüssel im Sinne einer Freigabe einer Drehbewegung des Kerns zusammenwirken, und der in seinem Kern mindestens ein weiteres Sperrteil aufweist, das mit dem Schlüssel in dessen Einschubrichtung entgegen einer Federkraft aus einer Sperrstellung mit Sperreingriff in eine Drehfreigabestellung verstellbar ist, in der das Gehäuse eine Ringnut aufweist, die Bewegungsfreiraum für das drehbeaufschlagte Sperrteil ist, wobei die Ringnut des Gehäuses außerhalb seines Stiftbereichs angeordnet ist, und wobei das Sperrteil mit der Schlüsselspitze beaufschlagbar ist.The invention relates to a locking cylinder, whose core rotatable in the housing radially to one Key channel has adjacent sliding core pins that with spring-loaded housing pins when actuated with a key cut in the sense of a Release a rotational movement of the core cooperate, and which has at least one further blocking part in its core, with the key in the opposite direction a spring force from a locked position with locking engagement is adjustable in a rotational release position in which the housing has an annular groove, the freedom of movement for is the rotating locking part, the annular groove of the Housing is arranged outside its pin area, and the locking part can be acted upon with the key tip is.

Ein Schließzylinder mit den eingangs genannten Merkmalen ist aus der DE-C-10 55 996 bekannt.A lock cylinder with the features mentioned above is known from DE-C-10 55 996.

Der Erfindung liegt die Aufgabe zugrunde, einen Schließzylinder mit den eingangs genannten Merkmalen so zu verbessern, daß er eine größere Sicherheit gegen die Benutzung von falschen Schlüsseln bietet, ohne dabei die Funktionssicherheit der herkömmlichen Stiftzuhaltungen zu beeinträchtigen.The invention has for its object a locking cylinder to improve with the features mentioned at the beginning, that he has greater security against the use of offers wrong keys without sacrificing functional reliability of conventional pin tumblers.

Diese Aufgabe wird dadurch gelöst, daß das Sperrteil als Stift einer im axialen Endbereich des Gehäuses ausgebildeten axial wirkenden Zuhaltung ausgebildet ist, die eine radiale Trennebene besitzt, die zwischen einem am Kern befestigten, mit einer Schlüsselkanalfortsetzung versehenen Kernringvorsprung und einem gehäusefesten Ring liegt, wobei die Zuhaltung aus einem im Kernringvorsprung im Bereich der Schlüsselkanalfortsetzung gehaltenen axial von der Schlüsselspitze verschiebbaren Kernringstift und einem in dem gehäusefesten Ring axial verschiebbaren stiftartigen Sperrteil besteht.This object is achieved in that the locking part as Pin one formed in the axial end region of the housing axially acting tumbler is formed, which is a radial Dividing plane, which is between a fixed to the core, core ring projection provided with a key channel extension and a housing-fixed ring, the tumbler from a in the core ring projection in the area of the key channel continuation held axially by the key tip sliding core ring pin and one in the housing-fixed Ring axially displaceable pin-like locking part is made.

Für die Erfindung ist von Bedeutung, daß zwar ein Eingriff des Sperrteils in das Gehäuse erfolgt, um eine unerwünschte Drehbewegung des Kerns auszuschließen, daß andererseits aber eine axial, also in Einschubrichtung erfolgende Verstellbewegung des Sperrteils erforderlich ist, um dieses in die Drehfreigabestellung zu bewegen. Infolgedessen kann das Sperrteil einer herkömmlichen Ausbildung eines Schließzylinders optimal angepaßt werden, ohne in dessen Stiftzuhaltungs- oder Schlüsselkanalbereich eingreifen zu müssen. Insbesondere ist die Verdrehung des Kerns im Gehäuse infolge einer außerhalb des Stiftbereichs gelegenen axial wirkenden Zuhaltung möglich. Die das Sperrteil aufweisenden Bauteile können als kompakte Baueinheit ausgebildet sein, die verdrehfest im Gehäuse angeordnet wird und mit dem Kern bzw. dessen radialen Kernringvorsprung zusammenwirkt. Dieses Zusammenwirken kann in bei üblichen Schlitzzuhaltungen bekannter Weise durchgeführt werden. Hierzu ist der Schließzylinder so ausgebildet, daß das Sperrteil von dem Schlüssel mit einem Kernringstift in seine Drehfreigabestellung verstellbar ist. Es ist dann nicht erforderlich, den der Betätigung des Sperrteils dienenden Schlüssel direkt auf das Sperrteil einwirken zu lassen, was wegen der meist spezifischen Ausbildung der Schlüsselspitze zu erhöhtem konstruktiven Mehraufwand führen könnte. Vielmehr wird ein Kernringstift benutzt, der in seiner Funktion den herkömmlichen Kernstiften entspricht, so daß der Schlüssel den Sicherheitsanforderungen entsprechend unterschiedlich angepaßt ausgebildet sein kann.It is important for the invention that an intervention of the locking part in the housing is done to an undesirable Exclude rotational movement of the core that on the other hand but an axial one, i.e. in the direction of insertion Adjustment movement of the locking part is necessary to this to move to the rotational release position. As a result the locking part of a conventional design of a lock cylinder can be optimally adjusted without or having to intervene in the key channel area. Especially is the torsion of the core in the housing as a result of Axially acting tumbler located outside the pin area possible. The components having the locking part can be designed as a compact unit that is non-rotatable is arranged in the housing and with the core or its radial Core ring projection interacts. This interaction can in a known manner in conventional slot tumblers be performed. For this purpose, the locking cylinder is designed that the locking part of the key with a core ring pin is adjustable in its rotational release position. It is then not necessary, the actuation of the locking part Serve key directly on the locking part to let what because of the mostly specific training of the Leading the key to increased constructive effort could. Rather, a core ring pin is used, which in its Function corresponds to the conventional core pins, so that the key varies according to security requirements can be adapted.

Die Erfindung wird anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Es zeigt:

Fig.1
einen schematischen Längsschnitt eines erfindungsgemäßen Schließzylinders in der Ebene seiner Zuhaltungsbohrungen, und
Fig.2
den Schnitt AB der Fig.1.
The invention is explained with reference to an embodiment shown in the drawing. It shows:
Fig. 1
a schematic longitudinal section of a lock cylinder according to the invention in the plane of its tumbler holes, and
Fig. 2
the section AB of Fig.1.

Der in den Figuren dargestellte Schließzylinder 10 hat ein Gehäuse 11 mit einer Gehäusebohrung, in der ein Kern 12 drehbar angeordnet ist. Das Gehäuse 11 ist für einen Doppelzylinder bestimmt und demgemäß mit einer mittig zwischen den beiden Gehäusehälften angeordneten Nut für einen nicht dargestellten Schließbart versehen. Der Kern 12 ist mit einem Schlüssel drehverstellbar, der in einen Schlüsselkanal 13 einschiebbar ist. Vertikal zum Schlüsselkanal 13 sind in dessen Ebene Kernstifte in entsprechenden Bohrungen des Kerns 12 und Gehäusestifte in entsprechenden Bohrungen des Gehäuses 11 angeordnet. Die Stifte sind von an gehäusefesten Widerlagerstiften abgestützten Federn federbelastet und bilden Stiftzuhaltungen, die ein Verdrehen des Kerns 12 wirksam verhindern, wenn sie nicht von dem mit Einschnitten versehenen Schlüssel entgegen ihrer Federbelastung mit einem Einschnitt in die einzige vorbestimmte Stellung verschoben sind, in der die Trennebene der Stifte mit dem Außenumfang des Kerns 12 zusammenfällt. In diesem Fall verhindern sie eine Drehverstellung des Kerns 12 nicht.The lock cylinder 10 shown in the figures has a housing 11 with a housing bore in which a core 12 is rotatably arranged. The housing 11 is for a double cylinder determined and accordingly with a middle between the two housing halves arranged groove for a not shown Fitted with a mustache. The core 12 is with a Key rotatably adjustable into a key channel 13 can be inserted. Vertical to the key channel 13 are in the Level core pins in corresponding holes in core 12 and housing pins in corresponding bores of the housing 11 arranged. The pins are on abutment pins fixed to the housing supported springs are spring-loaded and form pin tumblers, which effectively prevent the core 12 from twisting, if not from the incised key against their spring load with an incision in the only predetermined position are shifted in which the Parting plane of the pins coincides with the outer circumference of the core 12. In this case, they prevent rotation adjustment of core 12 not.

Zusätzlich zu den vorbeschriebenen Stiftzuhaltungen ist ein zusätzliches Sperrteil 17' vorhanden, das ebenfalls vom Schlüssel in eine vorbestimmte Stellung verschoben werden muß, damit der Kern 12 im Gehäuse 11 verdreht werden kann.In addition to the pin tumblers described above an additional locking part 17 'available, which also from Keys are moved to a predetermined position must, so that the core 12 can be rotated in the housing 11.

In den Fig.1,2 ist eine Ausgestaltung des Schließzylinders 10 dargestellt, bei der ein radialer Kernringvorsprung 20 am Kern 12 befestigt und infolgedessen mit diesem verdrehbar ist. Eine solche Verdrehung des Kerns 12 mit einem zugehörigen Schlüssel ist jedoch nur dann möglich, wenn zuvor eine Entsperrung des Sperrteils 17' stattgefunden hat. Das Sperrteil 17' ist als längsverstellbarer Stift ausgebildet, der in einem gehäusefesten Verschlußring 35 schlüsselverschieblich angeordnet ist. Der Verschlußring 35 ist in einer Gehäusebohrung 36 angeordnet, deren Außendurchmesser der Ringnut 19 für den radialen Kernringvorsprung 20 entspricht. Es sind jedoch Befestigungsstifte 44 vorgesehen, die das Gehäuse 11 mit dem Verschlußring 35 fest verbinden. Der Verschlußring 35 hat eine Bohrung 34, die mit dem für die Schlüsselschulter des Schlüssels 16 bestimmten Bereich des Schlüsselkanals 13 fluchtet und der Aufnahme der Feder 25 dient, die sich einerseits an einem Widerlagerstift und andererseits an dem Sperrteil 17' abstützt. Sofern der Kernringvorsprung 20 in der in Fig.1 dargestellten Verdrehstellung ist, greift das Sperrteil 17' in eine Ausnehmung 20' des Kernringvorsprungs 20 ein und verhindert damit ein Verdrehen dieses Kernringvorsprungs 20. Das Sperrteil 17' verschiebt einen Kernringstift in die aus der Fig.1 ersichtliche Stellung. Wird ein passender Schlüssel eingeschoben, so ist dieser im Bereich seiner Schulter so ausgebildet, nämlich mit einer Ausnehmung versehen, daß er das Sperrteil 17' mit Hilfe des Kernringstifts 33 so verschiebt, daß beider Trennebene mit der Ebene zwischen dem Kernringvorsprung 20 und des Verschlußrings 25 gleich liegt. Der Kern 12 kann infolgedessen verdreht werden.1, 2 is an embodiment of the locking cylinder 10 shown, in which a radial core ring projection 20 attached to the core 12 and consequently rotatable therewith is. Such a rotation of the core 12 with an associated one However, the key is only possible if there is a key Unlocking of the locking part 17 'has taken place. The Locking part 17 'is designed as a longitudinally adjustable pin, the key-displaceable in a lock ring 35 fixed to the housing is arranged. The locking ring 35 is in one Housing bore 36 arranged, the outer diameter of which Corresponds to the annular groove 19 for the radial core ring projection 20. However, mounting pins 44 are provided which the housing 11 firmly connect with the locking ring 35. The lock ring 35 has a bore 34 which with the for Key shoulder of the key 16 specific area of the Key channel 13 is aligned and the inclusion of the spring 25 serves, on the one hand on an abutment pin and on the other is supported on the locking part 17 '. If the core ring projection 20 in the rotational position shown in Fig.1 is, the locking part 17 'in a recess 20' of the Core ring projection 20 and thus prevents twisting this core ring projection 20. The locking part 17 'moves a core ring pin in the position shown in Figure 1. If a suitable key is inserted, it is trained in the area of his shoulder, namely with provided a recess that he the locking part 17 'with the help the core ring pin 33 moves so that both parting plane with the plane between the core ring projection 20 and the locking ring 25 is the same. As a result, the core 12 can be twisted.

Claims (2)

  1. Cylinder lock (10) whose core (12), rotatably moveable in the housing (11), has displaceable core pins radially adjacent to a key channel (13), said core pins cooperating with spring-loaded housing pins upon actuation by a key, suitably indented on the pin side, in the sense to free the core (12) for rotational movement, and which has in its core (12) at least one further blocking part (33) which is displaceable by the key (16) in its direction of insertion (18) against a spring force (25), from a blocking position with blocking engagement into a rotationally free position, wherein the housing (11) has an annular groove (19) which is the free space for movement for the rotatably actuated blocking part (33), wherein the annular groove (19) of the housing (11) is arranged outside its pin region, and wherein the blocking part (33) is arranged to be actuated by the tip of the key, characterised in that the blocking part (33) is formed as pin (33) of an axially acting tumbler (33, 17') formed in the axial end region of the housing (11), said tumbler having a radial dividing plane which lies between a core ring protuberance (20) fixed to the core and provided with a key channel extension on the one hand and a ring (35) fixed to the housing on the other hand, and wherein the tumbler comprises a core ring pin (33) axially displaceable by the key tip and held in the core ring protuberance in the region of the key channel extension, and a pin-type blocking part (17') axially displaceable in the ring (35) fixed to the housing.
  2. Cylinder lock according to claim 1, characterised in that the blocking part (17') with the associated spring (25) is provided in a bore (34), connected to the key channel (13), of a closure ring (35) connected fixedly to the housing (11), with the closure ring being arranged in a housing bore (36) for the core ring protuberance (20).
EP95100397A 1994-01-18 1995-01-13 Cylinder lock Expired - Lifetime EP0663498B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97121318A EP0835975B1 (en) 1994-01-18 1995-01-13 Cylinder lock

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9400744U DE9400744U1 (en) 1994-01-18 1994-01-18 Locking cylinder
DE9400744U 1994-01-18

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP97121318A Division EP0835975B1 (en) 1994-01-18 1995-01-13 Cylinder lock

Publications (2)

Publication Number Publication Date
EP0663498A1 EP0663498A1 (en) 1995-07-19
EP0663498B1 true EP0663498B1 (en) 1998-07-08

Family

ID=6903327

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97121318A Expired - Lifetime EP0835975B1 (en) 1994-01-18 1995-01-13 Cylinder lock
EP95100397A Expired - Lifetime EP0663498B1 (en) 1994-01-18 1995-01-13 Cylinder lock

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP97121318A Expired - Lifetime EP0835975B1 (en) 1994-01-18 1995-01-13 Cylinder lock

Country Status (5)

Country Link
EP (2) EP0835975B1 (en)
AT (2) ATE184358T1 (en)
DE (3) DE9400744U1 (en)
DK (1) DK0663498T3 (en)
ES (1) ES2118450T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT4292U1 (en) * 2000-05-09 2001-05-25 Kaba Gege Gmbh FLAT KEY
DE10049780A1 (en) * 2000-10-09 2002-04-18 Winkhaus Fa August Key and profiled closure cylinder have closure duct for key, with closure notches matching pin tumblers, additional tumbler, support surface, housing, core, annular and angled cavities.
US6945082B2 (en) * 2001-02-06 2005-09-20 Medeco Security Locks, Inc. Key blank, key and master keying system
PT2262964T (en) * 2007-10-30 2017-02-06 Mauer Locking Systems Eood Cylinder lock
DE102010029168A1 (en) * 2010-05-20 2011-11-24 Bks Gmbh Profile cylinder key
DE102016106404A1 (en) * 2016-04-07 2017-10-12 Dom Sicherheitstechnik Gmbh & Co. Kg Improved lock cylinder

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1055996B (en) * 1957-01-14 1959-04-23 Zeiss Ikon Ag Cylinder lock with an axial and a radial lock between the housing-fixed and rotatable lock part
DE2828343A1 (en) * 1978-06-28 1980-01-10 Perkut B R Rotating cylinder lock with double locking feature - has axially and radially moving pins actuated by key pushing contact faces for release
CH636669A5 (en) * 1978-01-05 1983-06-15 Grundmann Gmbh Geb Cylinder lock having a rotatable cylinder plug and a plurality of sliding pins displaceable in axial bores thereof
GB2159564A (en) * 1984-05-30 1985-12-04 Huang Ching Shih Improved pin-tumbler lock
FR2588033B1 (en) * 1985-10-02 1991-09-27 Dupart Jean BARREL LOCK WITH ENHANCED SECURITY AGAINST HOOKING
DE3603687A1 (en) * 1986-02-06 1987-08-13 Dom Sicherheitstechnik LOCKING CYLINDER AND RELATED FLAT KEY
DE3838481A1 (en) * 1988-11-12 1990-05-17 Erich Mundhenke CYLINDER LOCK
DE9015170U1 (en) * 1990-11-03 1991-05-08 Mundhenke, Erich, 3252 Bad Münder Locking device

Also Published As

Publication number Publication date
ES2118450T3 (en) 1998-09-16
ATE184358T1 (en) 1999-09-15
EP0835975B1 (en) 1999-09-08
ATE168163T1 (en) 1998-07-15
DE59506815D1 (en) 1999-10-14
DE59502712D1 (en) 1998-08-13
DK0663498T3 (en) 1999-02-15
DE9400744U1 (en) 1995-05-18
EP0663498A1 (en) 1995-07-19
EP0835975A1 (en) 1998-04-15

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