EP3299544B1 - Lock cylinder with key tip wear compensating coupling - Google Patents

Description

Field of engineering

The invention relates to a locking device with a lock cylinder having two in the direction of an axis on both sides next to a closing member arranged, each having a key channel cylinder cores, a key with a key shank, the key shank up to a stop position in which a key-sided stop, for example, on one end face strikes the cylinder core, can be inserted into the keyway, and arranged in an axial cavity of the closing member coupling device with two each rotatably coupled with an associated cylinder core coupling members in a basic position, in which no key shank in each associated key channel inserted, by a biased clutch spring are acted upon in the direction of the axis in a remote position from each other, wherein each of the coupling members comprises an actuating member which in the direction of the associated cylinder core of a prestressed Actuating spring is acted upon and abuts in the basic position with a counter-stop on a stop of the coupling member, wherein at least in the normal position, the force of the actuating spring is greater than the force of the clutch spring, wherein the actuator when inserting the key shank into the keyway of the key tip to an actuation path is shifted while the associated coupling member by a power transmission via the actuating spring to a coupling path from the basic position to a coupling position, in which the coupling member with a shoulder against a stop zone of the closing member entrains, at least in the coupling position engagement of a coupling profile of the coupling member in a coupling counter profile of the closing member a rotary movement the associated cylinder core is transferable to the closing member about the axis.

State of the art

The DE 10 2015 100 469 A1 describes a locking device having a lock cylinder having two axially successively arranged cylinder cores. Between the cylinder cores is a closing member with a coupling device, which is designed so that either one of the two cylinder cores is rotationally coupled to the closing member. The coupling device has two mutually sprung coupling members, which can be moved from a basic position to a coupling position. A key tip engages a motion transmitting member that can spring-shorten. A free end of the motion transmitting member acts on an actuator of the coupling device, which in turn acts on the coupling member.

FR 2 728 929 A1 discloses a locking device with a lock cylinder having two in the direction of an axis on both sides of a closing member arranged, each having a key channel cylinder cores, a key with a key shank, the key shank up to a stop position in which abuts schlüsselseitiger stop on the cylinder core, in the keyway can be inserted, and disposed in an axial cavity of the closing member coupling device with two rotatably coupled with an associated cylinder core coupling members, which in a basic position, in which no key shank in each associated key channel inserted, by a biased clutch spring in the direction of the axis in a remote Position are acted upon each other, wherein each of the coupling members comprises an actuating member which is acted upon in the direction of the associated cylinder core by a biased actuating spring and i n the basic position is applied with a counter-stop on a stop of the coupling member, wherein the actuating member is displaced upon insertion of the key shank in the keyway of the key tip to an actuating path and thereby the associated coupling member by a Power transmission via the actuating member supporting the coupling member by a clutch from the basic position to a coupling position, in which the coupling member entrains the closing member, wherein at least in the coupling position engagement of a coupling profile of the coupling member in a counter-coupling profile of the closing member a rotational movement of the associated cylinder core about the axis is transferable to the closing member.

The DE 103 04 152 A1 describes a double lock cylinder with a coupling device which has two mutually sprung coupling members.

Summary of the invention

The invention has for its object to further develop the known locking device nutzsvorteilhaft.

The problem is solved by the invention defined in claim 1. The dependent claims represent advantageous developments.

First and foremost, it is provided in the case of a lock cylinder of a closure device mentioned at the outset that the actuation travel which covers the actuation member acted upon by the key tip when inserting an unworn key is greater than the clutch travel which the coupling member encounters when inserting this key into the stop position the key to the cylinder core travels. In the final phase of insertion of the key in the key channel whose tip is applied to the actuator of the coupling member. In general, the coupling member is in an axial position in which it can be displaced in the direction of the closing member. This displacement path is the clutch path. After reaching the stop position, the coupling member can not be moved further relative to the closing member. If the actuating spring has a larger spring force than the clutch spring, the actuating member still has a stop position on the coupling member when the coupling member has reached its stop position relative to the closing member. If the key is pushed deeper into the keyway in this position, the counter-stop of the actuator must be spaced from the stop of the coupling member, which is associated with a compression of the actuating spring. The preloaded in the normal position actuating spring is thus more stressed in the course of the coupling process. As a result of this constructive measure, the tolerance range of the length of the key shank, ie the distance between the key tip of the key-side stop, which abuts at the end face of the cylinder core when fully inserted key. This has the consequence that a key worn on the key tip can still securely close the lock cylinder. The displacement of the coupling member from a basic position to the coupling position is thus connected to an overstroke. The coupling device preferably has two coupling members, which are held spaced apart by means of a prestressed clutch spring. The coupling members are preferred permanently rotatably coupled with one of the two cylinder cores. However, the coupling members may shift relative to the cylinder core in the direction of the axis. The coupling members preferably form radially projecting extensions, which engage in the coupling position in Kupplungsprofilausnehmungen of the closing member so as to achieve a rotationally fixed coupling of the closing member with the cylinder core, in which the key is inserted. Is an opposite coupling member in a coupling position, the insertion of the key and the concomitant axial displacement of the cylinder core associated coupling member with the result that the opposite coupling member is displaced out of the coupling position. Both coupling members are each equipped with an actuator. For this purpose, the coupling members may have central openings in which the actuators are arranged. The actuators are tied together in the axial direction. The coupling members can be tied together in the axial direction. Both the actuators and the coupling members can each be displaced toward each other by the compression of a spring element. The actuating spring, which acts on the actuating member with respect to its associated coupling member spring force is biased and is supported on a contact shoulder of the actuator and on a counter contact shoulder of the coupling member. By the two actuating springs protrude connecting elements with which the two actuating elements are interconnected. In a preferred embodiment of the invention, the two actuators are connected to each other with a snap connection. The snap connection can be formed by a spring tongue. Preferably, an actuator has two spring tongues extending in the axial direction, which form hooks at their free ends. The free ends of the spring tongues can engage in an insertion opening of the respective other actuator. The insertion opening may have an inwardly directed edge, which is engaged behind by the hooks of the spring tongues. The Mounting the two actuators is simplified in that slants are provided, which slide on insertion of the spring tongues into the engagement opening to each other, so that the spring tongues deform elastically. The hooks of the spring tongues then snap behind the hook shoulder of the insertion opening. The preloaded actuating spring acts on a head of the actuating member, to which the two spring tongues or a sleeve-shaped insertion opening adjoins. The head of the actuator is preferably surrounded by an annular collar or an arcuate collar. This collar forms a counter-stop and surrounds an end portion of the actuator. The actuating spring acts on this collar against a bow or annular edge of the coupling member, which forms a stop. The coupling member and the plug-in actuator thus form a structural unit, which can be assembled with an approximately identically designed structural unit, which consists of the other coupling member and the other actuator. For this purpose, the clutch spring is brought between the two coupling members, which is compressed. The connection of the two modules takes place by snapping the spring tongues into the engagement opening. The spring preload of the clutch spring is less than the spring preload of the actuating spring. If a key is not inserted in either of the two lock cylinders, the coupling device can basically assume an arbitrary position between the two cylinder cores in the axial direction. If the end face of an actuating member, which preferably has a flat portion, acted upon by the tip of a key which has been inserted into the keyway of the cylinder core, the coupling means is initially displaced axially until the opposite coupling member in a stop position on the associated cylinder core strikes. Then, the coupling members shift relative to each other, which is accompanied by a compression of the clutch spring. Simultaneously with this axial displacement of the acted upon by the key tip coupling member enters a coupling profile in a counter coupling profile, so that a rotational coupling of the coupling member is achieved with the closing member. The coupling member sets a coupling path in the axial direction, which is limited by a stop shoulder of the coupling member strikes a stop zone of the closing member, wherein the stop zone of the closing member may be formed by a ring land and the stop shoulder of the coupling member of an extension. In a variant of the invention it is provided that the coupling spring is only compressed during the displacement of the coupling member in the stop position on the closing member, if in the other lock cylinder also a key inserted, which prevents the key assigned to this coupling member completely in the uncoupled position can escape the closing member. Depending on the current position of the coupling device between the two cylinder cores, the clutch travel can thus also be zero. In the coupling position, the coupling member but is in a stop position on the closing member. An untapped key can be inserted after reaching the stop position of the coupling member on the closing member further into the keyway. In this case, the key tip displaces the actuator relative to the coupling member, so that the preloaded actuating spring spans further. The insertion movement of the key is completed when a key-side stop acts on a closing cylinder side counter-attack. Preferably, a key-side stop arranged in the region of the key ridge strikes against the end face of the cylinder core. In this position, tumbler pins o. The like., Which lock the rotatability of the cylinder core in the cylinder housing are displaced into a release position, as described in the relevant prior art, so that the cylinder core can be rotated in the housing. As a result of the coupling of the closing member with the cylinder core, the closing member is rotated during rotation. The actuation travel is greater than the clutch travel. The difference of the two paths defines a tolerance range within which the axial length of the key shank can vary without the Locking security of the locking device is adversely affected. A key with a worn key tip displaces the actuator only by a lesser actuation travel, so that in the final phase of the key insertion of the counter-stop of the actuator is spaced a smaller distance from the stop of the coupling member. The inventive design of the locking device thus results in that even keys with a worn key tip can close the lock cylinder safer.

Brief description of the drawings

Fig. 1

eine Seitenansicht auf einen Doppelschließzylinder, wobei der Schließzylinder im Bereich des Schließgliedes 4 teilweise aufgebrochen dargestellt ist,

Fig. 2

den Schnitt gemäß der Linie II-II in der Figur 1,

Fig. 3

den Schnitt gemäß der Linie III-III in Figur 2 bei nicht in den Schlüsselkanal 3 eingestecktem Schlüssel,

Fig. 4

eine Darstellung gemäß Figur 3, jedoch mit in dem Schlüsselkanal 3 eingestecktem unverschlissenen Schlüssel,

Fig. 5

eine Darstellung gemäß Figur 4, jedoch mit einem in den Schlüsselkanal 3 eingestecktem verschlissenen Schlüssel,

Fig. 6

den Schnitt gemäß der Linie VI-VI in Figur 1, bei nicht in den Schlüsselkanal 3 eingestecktem Schlüssel,

Fig. 7

den Schnitt gemäß der Figur 6, jedoch mit eingestecktem Schlüssel,

Fig. 8

eine Explosionsdarstellung der Elemente der Kupplungseinrichtung und

Fig. 9

eine perspektivische, teilweise aufgebrochene Darstellung einer zusammengesetzten Kupplungseinrichtung.

An embodiment of the invention will be explained below with reference to accompanying drawings. Show it:

Fig. 1

a side view of a double lock cylinder, wherein the lock cylinder is shown partially broken in the region of the closing member 4,

Fig. 2

the section according to the line II-II in the FIG. 1 .

Fig. 3

the section according to the line III-III in FIG. 2 if the key is not inserted in the key channel 3,

Fig. 4

a representation according to FIG. 3 but with the unworn key inserted in the keyway 3,

Fig. 5

a representation according to FIG. 4 but with a worn key inserted in the keyway 3,

Fig. 6

the section according to the line VI-VI in FIG. 1 , if the key is not inserted in the key channel 3,

Fig. 7

the cut according to the FIG. 6 , but with the key inserted,

Fig. 8

an exploded view of the elements of the coupling device and

Fig. 9

a perspective, partially broken view of a composite coupling device.

Description of the embodiments

The closing device shown in the drawings has a lock cylinder 1, which has a cylinder housing which has two cylinder cores 2, 2 'which are in each case aligned in mutually aligned bores. Between the two cylinder cores 2, 2 ', a closing member 4 is arranged. The closure member 4 has a central cavity surrounded by an interruption ring land. In the central cavity of the closing member 4 is a coupling device 5 to bring either by inserting a matching key 10 either the left cylinder core 2 or the right cylinder core 2 'with the closing member 4 in a rotational driving position, so that turning the key in the channel 3 of the respective cylinder core 2, 2 'inserted key 10 has a rotation of the closing member 4 result.

The coupling device 5 has two of a clutch spring 7 away from each other spring-loaded coupling members 6, 6 '. The coupling members 6, 6 'have radial extensions 28, 28' which are not shown in slots of the respective cylinder core 2, 2 'are guided, so that in each case a coupling member 6, 6' with its associated cylinder core 2, 2 'is permanently rotationally coupled. However, the coupling members 6, 6 'can be displaced axially relative to the cylinder core 2 in the direction of the axis A. The coupling members 6, 6 'form in particular with their extensions 28, 28' shoulders 27, 27 ', which can abut stop zones 26, 26' of the closing member 4. The stop zone 26, 26 'of the closing member 4 is preferably formed by a surface of the annular web. The axial displacement of the coupling member 6 in a direction away from the cylinder core 2 assigned to it is thus limited by the shoulder 27, 27 'of the closing member 4 abutting the stop zone 26, 26'.

In the axial displacement of a coupling member 6, 6 'from a basic position in which a coupling profile 18 of the coupling member 6, 6' does not engage in a coupling counter-profile 19 of the closing member 4, and in which the coupling member 6, 6 'relative to the closing member 4 can be rotated , the coupling member 6 can be displaced into a coupling position in which the coupling profile 18 engages in the coupling counter-profile 19. A rotational connection of the coupling member 6, 6 'with the closing member 4 but is also possible in that one of the extensions 28, 28' engages in a radial recess of the annular web.

Each of the two coupling members 6, 6 'has a respective associated cylinder core 2, 2' facing opening with a central through hole. In the opening, an actuating spring 9, 9 'is used. One end of the actuating spring 9, 9 'is supported on the bottom of the opening. Due to the central clearance of the helical gear spring formed as actuating spring 9, 9 ', a shaft 20, 20' of an actuator 8, 8 'is used. The actuator 8, 8 'has a to the shaft 20, 20' adjoining Head forming a frontal section. From the head of the actuator 8 projects radially outwardly from a counter-stop 16, which can engage under an edge of the coupling member 6. When mounting the coupling device after insertion of the actuator 8, 8 'with the counter-stop 16 in the opening of the coupling member 6, 6' of the stop 17 to the coupling member 6, 6 'integrally formed.

Is the counter-stop 16 supported on the stop 17 of the coupling member 6, 6 ', the head of the actuator 8, 8' of the prestressed actuating spring 9, 9 'held in position, said end portions of the shafts 20, 20' through the through hole of Bottom of the opening of the coupling member 6, 6 'reach through.

A shaft is formed by two spring tongues 20 which run parallel to one another and have hooks 23 at their free ends. The other shaft forms an insertion opening 21, in which the hooks 23 of the spring tongues 20 can be inserted. The hooks 23 engage behind a hook shoulder 22 of the insertion opening 21. Both the hooks 23 and the hook shoulder 22 form bevels 24, 25, which slide into one another when the hooks 23 are inserted into the insertion opening 21, so that the spring tongues move elastically toward one another so that the hooks 23 can snap behind the hook shoulder 22.

The coupling members 6, 6 'are displaceable in the axial direction relative to each other. Since the spring preload of the actuating springs 9, 9 'is greater than the spring preload of the clutch spring 7, at first, only the clutch spring 7 is tensioned when the end face of an actuating member 8, 8' is axially loaded. The actuator 8, 8 'initially remains in an unchanged position relative to its associated coupling member 6, 6'. Only when the shoulder 27, 27 'the stop zone 26, 26' of the closing member 4 is applied, the actuating member 8, 8 'by applying an axial force relative to its associated coupling member 6, 6' is displaced.

The operation of the lock cylinder is described below with reference to FIGS. 3 to 7 explains:
When not keyed key 10 in the keyway 3, the coupling device 5 takes, for example. In the FIG. 3 shown position. However, since the coupling device 5 is assigned to the closing member 4 floating, the coupling device 5 can also be in a shifted to the left or right position, for example. In a position in which the respective coupling member 6, 6 'in a contacting system on the associated Cylinder core 2, 2 'is present. In such a basic position, the coupling profiles 18 do not engage in their associated counter-coupling profiles 19, so that the closing member 4 relative to the cylinder core 2, 2 'can be rotated.

Is starting, for example, in the FIG. 4 Due to the stiffer actuating spring 9 and the floating mounting of the coupling device 5 in the central cavity of the closing member 4, the entire coupling device is first 5 inserted untapped key into the keyway 3, so acted upon the key tip 12 of the key shank of the actuator from the in the FIG. 3 shown shifted to the right middle position, so that the coupling profiles 18 'of the coupling member 6' are pushed out of the coupling counter-profile 19. The right cylinder core 2 'is then not coupled to the closing member 4. However, the coupling profile 18 is in a coupling engagement position in the coupling counter-profile 19th

The coupling member 6 is displaced so far in the insertion of the key, possibly accompanied by a compression of the clutch spring 7 in the direction of the closure member 4, that the shoulder 27 of the coupling member 6 abuts against the stop zone 26 of the closure member 4. After this shift, the coupling member 6 has covered the clutch path K. The stop 13 of the key 10 is still axially spaced from the cylinder core side end wall 14, so that the key 10 must be further inserted in the axial direction in the keyway 3 until it has reached its final operating position. During this phase of the key insertion, the actuator 8 is displaced in the axial direction relative to the coupling member 6, so that the actuator 8 has covered a larger axial actuation B in the key insertion, as the coupling path K of the coupling member. 6

The FIG. 5 shows a representation according to FIG. 4 However, after the insertion of a key 10, the key tip 12 is worn due to, for example, a multiple use. The distance of the key tip 12 to the stop 13 is less here than with a non-worn key 10. This worn key 10 is also able to move the coupling member 6 axially into a proper coupling position in which the coupling profile 18 deep enough in the Coupling counter-profile 19 is immersed and the shoulder 27, 27 'at its associated stop zone 26, 26' of the closing member 4 is present. The actuation path B 'of this worn key 10 is less than the actuating travel B of the unworn key 10, but larger than the clutch stroke K. If the displacement of the coupling member 6 from the same basic position, so the coupling paths K in the displacement of the coupling member 6 through the untapped key and the worn key same. The actuation paths B, B ', however, differ.

The wear limit of the key 10 is approximately reached when displacing the coupling device 5 of the in FIG. 3 illustrated basic position in the coupling position of the clutch travel K the respective actuation path B, B 'corresponds. <b><u> List of Reference Numbers </ u></b> 1 lock cylinder 20 ' shaft 2 cylinder core 21 insertion 2 ' cylinder core 22 hook shoulder 3 keyway 23 hook 4 closing member 24 slope 5 coupling device 25 slope 6 coupling member 26 Stop zone of the closing element 6 ' coupling member 7 clutch spring 26 ' Stop zone of the closing element 8th actuator 8th' actuator 27 shoulder 9 actuating spring 27 ' shoulder 9 ' actuating spring 28 extension 10 key 28 ' extension 11 key shaft 12 key tip 13 attack 14 End face, wall, cylinder core 15 face 16 counterstop 17 Stop of the coupling member A axis 18 coupling profile B actuating 18 ' coupling profile B ' actuating 19 Coupling counter profile K clutch travel 20 Spring tongue, shaft

Claims (10)

1. Locking device having a locking cylinder (1) comprising two cylinder cores (2, 2') arranged on both sides next to a locking member (4) in the direction of an axis (A) and each comprising a key channel (3), a key (10) having a key shaft (11), wherein the key shaft (11) is insertable into the key channel (3) as far as into a stop position, in which a key-side stop (13) strikes the cylinder core (2, 2'), and a coupling device (5) arranged in an axial cavity of the locking member (4) and having two coupling members (6, 6'), which are each coupled in a rotationally fixed manner to an associated cylinder core (2, 2') and which, in a basic position in which no key shaft (11) is inserted in the respectively associated key channel (3), are acted upon by a prestressed coupling spring (7) in the direction of the axis (A) in a remote position from one another, wherein each of the coupling members (6, 6') comprises an actuating member (8, 8'), which is acted upon in the direction of the associated cylinder core (2, 2') by a prestressed actuating spring (9, 9') and, in the basic position, bears with a counter-stop (16) against a stop (17) of the coupling member (6, 6'), wherein the force of the actuating spring (9, 9') is greater at least in the basic position than the force of the coupling spring (7), wherein the actuating member (8, 8') is displaced by an actuating path (B) from the key tip (12) when the key shaft (11) is inserted into the key channel (3), and the associated coupling member (6, 6') is carried along by a force transmission via the actuating spring (9, 9') supported on the coupling member (6, 6') by a coupling path (K) from the basic position into a coupling position, in which the coupling member (6, 6') bears with a shoulder (27, 27') against a stop zone (26, 26') of the locking member (4), wherein at least in the coupling position an engagement of a coupling profile (18) of the coupling member (6, 6') in a coupling counter-profile (19) of the locking member (4) transmits a rotary movement of the associated cylinder core (2, 2') about the axis (A) to the locking member (4), wherein the actuating path (B, B') is greater than the coupling path (K), so that in the coupling position, the counter-stop (16) of the actuating member (8, 8') is spaced apart from the stop (17) of the coupling member (6, 6') when the actuating spring (9, 9') is more strongly stressed.
2. Locking device according to claim 1, characterized in that the actuating members (8, 8') are displaceable relative to one another from an end position axially constrained from one another by shortening their axial spacing.
3. Locking device according to one of the preceding claims, characterized in that the two actuating members (8, 8') are connected to a snap connection (22, 23).
4. Locking device according to one of the preceding claims, characterized in that the stop (17) of the coupling member (6, 6') is a curved edge against which lies a curved portion of a front side portion of the actuating member (8, 8') forming the counter-stop (16).
5. Locking device according to one of the preceding claims, characterized in that the actuating member (8, 8') comprises, at least in regions, a flat end face (15) which is acted upon by the key tip (12) when the actuating member (8, 8') is displaced relative to the locking member (4) by the actuating path (B, B').
6. Locking device according to one of the preceding claims, characterized in that one of the two actuating members (8, 8') comprises two spring tongues (20) projecting in the direction of the axis (A), which form hooks (23) at their free ends, wherein the free ends of the spring tongues (20) engage in an insertion opening (21) of the respective other actuating member (8', 8), the edge of which opening comprises a hook shoulder (22) engaging behind the hooks (23).
7. Locking device according to one of the preceding claims, characterized by bevels (24, 25) which slide against one another when the spring tongues (20) are inserted into the insertion opening (21), so that the spring tongues (20) deform resiliently.
8. Locking device according to one of the preceding claims, characterized in that a key (10) comprising a key shaft (11) shortened as a result of wear and tear, displaces the same coupling path (K) from the basic position into the coupling position as a key (10) having an unworn key shaft (11), when the actuation path (B') of the coupling member (6, 6') is reduced.
9. Locking device according to one of the preceding claims, characterized in that the shoulder (27, 27') is formed by an extension (28, 28') of the coupling member (6, 6').
10. Locking device according to one of the preceding claims, characterized in that the stop zone (26, 26') is formed by an annular web of the locking member (4).

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