Cylinder lock

Abstract

A cylinder lock comprises a cylinder housing (11) and a cylinder core (13) which is rotatably mounted in the cylinder housing. A plurality of plate tumblers (21) are provided in the cylinder core, wherein each of the plurality of plate tumblers is movable between a locking position and an unlocking position. At least one of the plurality of plate tumblers has a bolt-receiving depression (47). The cylinder lock further comprises at least one bolt element (27) which has a bolt tip (35), wherein the bolt element is movable between a blocking position and a release position. In the release position, the bolt tip engages in the bolt-receiving depression of the plate tumbler. The plate tumbler has, adjacent to the bolt-receiving depression, at least one bolt latch-in depression (45) in which the bolt tip of the bolt element engages in a latching manner when the at least one plate tumbler is moved out of the unlocking position, wherein the bolt latch-in depression is less deep than the bolt-receiving depression.

Claims

1. A cylinder lock having a cylinder housing and a cylinder core rotatably supported in the cylinder housing, wherein the cylinder housing has at least one tumbler blocking recess and a latch blocking recess; wherein a plurality of disk tumblers are provided in the cylinder core, with each of the plurality of disk tumblers having an engagement section and being movable between a latched position and an unlatched position, with the engagement section engaging into the tumbler blocking recess of the cylinder housing in the latched position and being brought out of engagement with the tumbler blocking recess in the unlatched position, and with at least one of the plurality of disk tumblers having a latch reception recess; and wherein the cylinder lock furthermore has a latch element which has a latch tip and a blocking section, with the latch element being movable between a blocking position and a release position and being preloaded into the release position, with the blocking section engaging into the latch blocking recess of the cylinder housing in the blocking position, and with the latch tip engaging into the latch reception recess of the at least one disk tumbler and the blocking section being brought out of engagement with the latch blocking recess of the cylinder housing in the release position, wherein the at least one disk tumbler has, adjacent to the latch reception recess, at least one latch catching recess into which the latch tip of the latch element catchingly engages when the at least one disk tumbler is displaced out of the unlatched position by a first path length, with the latch catching recess being less deep than the latch reception recess of the disk tumbler; wherein the latch element has a connection section between the latch tip and the blocking section, the connection section being narrower with respect to a tangential direction about the axis of rotation of the cylinder core than the blocking section of the latch element; wherein at one side, which faces in a rotary direction of opening of the cylinder core, the connection section of the latch element ends flush with the blocking section of the latch element, and wherein at another side, which faces against the rotary direction of opening of the cylinder core, the connection section of the latch element is set back with respect to the blocking section of the latch element so that a lateral projection is formed.

2. A cylinder lock in accordance with claim 1, wherein the at least one disk tumbler has, adjacent to the latch reception recess, a plurality of latch catching recesses arranged next to one another.

3. A cylinder lock in accordance with claim 1, wherein the at least one disk tumbler has a respective at least one latch catching recess at both sides of the latch reception recess.

4. A cylinder lock in accordance with claim 1, wherein the at least one disk tumbler has a respective plurality of latch catching recesses arranged next to one another at both sides of the latch reception recess.

5. A cylinder lock in accordance with claim 1, wherein the latch reception recess is provided at a side edge of the at least one disk tumbler with respect to the direction of movement of the at least one disk tumbler.

6. A cylinder lock in accordance with claim 1, wherein the latch reception recess and the at least one latch catching recess are substantially triangular.

7. A cylinder lock in accordance with claim 1, wherein the at least one disk tumbler has an intermediate elevated portion between the latch reception recess and the at least one latch catching recess, with the latch tip having an intermediate recess, and with the intermediate elevated portion of the at least one disk tumbler being adapted to engage into the intermediate recess of the latch tip when the at least one disk tumbler is displaced out of the unlatched position by a second path length which is smaller than the first path length.

8. A cylinder lock in accordance with claim 7, wherein the intermediate recess of the latch tip is formed as a groove which extends in parallel with the axis of rotation of the cylinder core.

9. A cylinder lock in accordance with claim 1, wherein a holding plate is arranged between the cylinder core and the cylinder housing, with a latch preloading device associated with the latch element being supported between the holding plate and the latch element.

10. A cylinder lock in accordance with claim 1, wherein each disk tumbler of a group which comprises some or all of the plurality of disk tumblers has a latch reception recess and at least one latch catching recess, with the latch element extending along the axis of rotation of the cylinder core, and with the latch tip engaging into the latch reception recesses of the group of disk tumblers in the release position of the latch element.

11. A cylinder lock in accordance with claim 1, wherein the plurality of disk tumblers are preloaded into the latched position along a first preload direction, with the latch element being preloaded into the release position along a second preload direction, and with the first preload direction and the second preload direction extending obliquely or perpendicular to one another.

12. A cylinder lock in accordance with claim 1, wherein the plurality of disk tumblers are preloaded into the latched position by means of a respective tumbler preloading device, with the latch element being preloaded into the release position by means of a latch preloading device, and with the tumbler preloading devices and the latch reception recess of the at least one disk tumbler and the latch preloading device and the latch tip of the latch element being coordinated such that, in a closed position of the cylinder core, the plurality of disk tumblers adopt the latched position and the at least one disk tumbler hereby urges the latch element into the blocking position.

13. A cylinder lock in accordance with claim 1, wherein each of the plurality of disk tumblers has a key introduction opening whose outline has a first coding section and a second coding section, with a key associated with the cylinder lock having a sequence of first incisions which correspond to the first coding sections of the plurality of disk tumblers and having a sequence of second incisions which correspond to the second coding sections of the plurality of disk tumblers.

14. A cylinder lock in accordance with claim 1, wherein the lateral projection is configured to be urged over an outer surface of the cylinder core when a torque in the rotary direction of opening of the cylinder core is exerted onto the cylinder core while the latch element is in the blocking position.

15. A cylinder lock having a cylinder housing and a cylinder core rotatably supported in the cylinder housing, wherein the cylinder housing has at least one tumbler blocking recess and a latch blocking recess; wherein a plurality of disk tumblers are provided in the cylinder core, with each of the plurality of disk tumblers having an engagement section and being movable between a latched position and an unlatched position, with the engagement section engaging into the tumbler blocking recess of the cylinder housing in the latched position and being brought out of engagement with the tumbler blocking recess in the unlatched position, and with at least one of the plurality of disk tumblers having a latch reception recess; and wherein the cylinder lock furthermore has a latch element which has a latch tip and a blocking section, with the latch element being movable between a blocking position and a release position and being preloaded into the release position, with the blocking section engaging into the latch blocking recess of the cylinder housing in the blocking position, and with the latch tip engaging into the latch reception recess of the at least one disk tumbler and the blocking section being brought out of engagement with the latch blocking recess of the cylinder housing in the release position, wherein the at least one disk tumbler has, adjacent to the latch reception recess, at least one latch catching recess into which the latch tip of the latch element catchingly engages when the at least one disk tumbler is displaced out of the unlatched position by a first path length, with the latch catching recess being less deep than the latch reception recess of the disk tumbler; wherein the latch element has a connection section between the latch tip and the blocking section, the connection section being narrower with respect to a tangential direction about the axis of rotation of the cylinder core than the blocking section of the latch element; wherein a holding plate is associated with the latch element and has a support opening, with the connection section of the latch element penetrating through the support opening when the latch element is in the blocking position; wherein, when the at least one disk tumbler is in the latched position and the latch element is in the blocking position, a first rotary clearance exists between the blocking section of the latch element and the latch blocking recess of the cylinder housing with respect to a rotary actuation of the cylinder core, a second rotary clearance exists between the connection section of the latch element and the support opening of the associated holding plate, and a third rotary clearance exists between the engagement section of the at least one disk tumbler and the tumbler blocking recess of the cylinder housing; and wherein the first rotary clearance is smaller than the second rotary clearance and the second rotary clearance is smaller than the third rotary clearance.

16. A cylinder lock in accordance with claim 15, wherein the holding plate is arranged between the cylinder core and the cylinder housing, with a latch preloading device associated with the latch element being supported between the holding plate and the latch element.

Description

(1) The invention will be described in the following only by way of example with reference to the drawings.

(2) FIG. 1 shows a cylinder lock in an exploded view;

(3) FIG. 2 shows the cylinder lock from the rear, with the cylinder core (FIG. 2b) having been removed from the cylinder housing (FIG. 2a);

(4) FIG. 3 shows the cylinder lock from the rear, with the cylinder core having been inserted into the cylinder housing;

(5) FIG. 4 shows a perspective view of a group of disk tumblers as well as a latch element guided by a holding plate;

(6) FIG. 5 shows the holding plate and the latch element in a further exploded view; and

(7) FIG. 6a and FIG. 6b show the cylinder lock in a latched state (FIG. 6a) and in an unlatched state (FIG. 6b), with both drawings representing a cross-sectional view of the cylinder lock.

(8) The design of the shown cylinder lock will first be described with reference to FIG. 1. The lock has a cylinder housing 11 and a cylinder core 13 rotatable therein, wherein the cylinder housing 11 has tumbler blocking recesses 15, 15 and a latch blocking recess 17. The cylinder core 13 has, at its upper side and at its lower side (not shown), tumbler openings 19 for receiving disk tumblers 21. Furthermore, a latch reception opening 25 for receiving a latch element 27 and a holding plate reception recess 29 for receiving a holding plate 31 are provided laterally at the cylinder core 13. The cylinder lock can be opened and closed by means of an associated key 33, with the cylinder core 13 being rotatable about an axis of rotation A.

(9) In FIG. 2b, the cylinder core 13 is shown with the key 33 introduced therein, with the disk tumblers 21, the holding plate 31 and the latch element 27 being received in the cylinder core 13. In FIG. 2a, the cylinder housing 11 is illustrated, with the substantially circular cross-section of the inner jacket surface of the cylinder housing 11 being interrupted by diametrically opposite tumbler blocking recesses 15, 15 and the latch blocking recess 17 arranged offset by 90 therefrom. In FIG. 3, the cylinder housing 11 is shown with the cylinder core 13 received therein, wherein a blocking section 37 of the latch element 27 engages into the latch blocking recess 17.

(10) The disk tumblers 21 are movable in the cylinder core 13 along a preload direction Y shown in FIGS. 1 and 4 between a latched position and an unlatched position, wherein the disk tumblers 21, as shown in FIG. 4, are preloaded along the preload direction Y by means of disk tumbler springs 55, 55. Groups of disk tumblers 21 are in this respect preloaded in opposite senses in the embodiment shown, i.e. one group of disk tumblers 21 is preloaded in the preload direction Y by means of disk tumbler springs 55 so that the respective engagement section 23 engages into the tumbler blocking recess 15 of the cylinder housing 11 in the latched position; another group of disk tumblers 21 is preloaded against the preload direction Y by means of disk tumbler springs 55 so that the respective engagement section 23 engages into the tumbler blocking recess 15 of the cylinder housing 11. Each disk tumbler 21 is formed in one piece and has a key introduction opening 63 (FIG. 4).

(11) As is shown in FIG. 4, the disk tumblers 21 has, at an outer longitudinal side, a respective latch reception recess 47 which is provided for receiving a latch tip 35 of the latch element 27. Adjacent to the latch reception recess 47, latch catching recesses 49a, 49a, 49b and 49b are provided at both sides, wherein the latch catching recesses 49a and 49a are arranged above the latch reception recess 47 in the preload direction Y and the latch catching recesses 49b and 49b are arranged beneath the latch reception recess 47 (against the shown preload direction Y). An Intermediate elevated portion 51a is furthermore provided between the latch reception recess 47 and the latch catching recess 49a. In the same way, an intermediate elevated portion 51b is provided between the latch reception recess 47 and the latch catching recess 49b. The latch catching recesses 49a, 49a, 49b and 49b are designed for a catching engagement of the latch tip 35 of the latch element 27 when the respective disk tumbler 21 is displaced relative to its unlatched position (FIG. 6b). The latch catching recesses 49a, 49a, 49b and 49b are less deep than the latch reception recess 47.

(12) As shown in FIG. 5, the latch tip 35 of the latch element 27 and the blocking section 37 of the latch element 27 are connected to one another by means of a connection section 39. The latch tip 35 has a groove 41 at its front side which satisfies the function of an intermediate recess 43. The latch element 27 is preloaded into a preload direction X of the latch element 27 by means of a latch preloading device comprising latch element springs 45, 45 (FIG. 4), wherein the latch element springs 45, 45 are located between the latch tip 35 and the holding plate 31 at both sides of the connection section 39 (FIG. 5 and FIG. 1). The preload direction X of the latch element 27 extends perpendicular to the preload direction Y of the disk tumblers 21 in the embodiment shown here. Alternatively to this, the respective directions of movement and accordingly the two preload directions X, Y can, however, also extend obliquely to one another.

(13) As shown in FIG. 4, the latch element 27 is guided by a support opening 53 of the holding plate 31, wherein the blocking section 37 is located in the radially outwardly disposed region of the holding plate 31; the latch tip 35 of the latch element 27 is located at the other end in the radially inner region, i.e. within the cylinder core 13, wherein the outlines of the cylinder core 13 are not drawn in FIG. 4 for the purpose of better visibility of the parts located in the cylinder core 13. It is furthermore shown in FIG. 4 that the connection section 39 of the latch element 27 is not set back or is set back less at a side 46a which faces in a rotary direction of opening O of the cylinder core 13, with respect to the blocking section 37 of the latch element 27, than at another side 46b which faces against the rotary direction of opening O of the cylinder core 13. In the embodiment shown here, the surface 46b is chamfered with respect to the planar surface 46a. The blocking section 37 of the latch element 27 thus forms a lateral projection 65 at the side 46b, the lateral projection protruding beyond the side 46b or the chamfered surface 46b.

(14) On a manipulation attempt in the form of picking, in which the cylinder core 13 is preloaded in the rotary direction of opening O (that is when the cylinder core 13 is moved counter-clockwise beyond the shown rotational position with respect to the representation in accordance with FIG. 6a), the lateral projection 65 has the effect that the latch element 27 remains in its blocking position even if all the disk tumblers 21 are in their unlatched position (in accordance with FIG. 6b) due to a successively taking place setting and the latch tip 35 of the latch element 27 can thus engage into the latch reception recesses 47 of all the disk tumblers 21. In this state, the lateral projection 65 of the blocking section 37 namely engages over the outer periphery of the cylinder core 13 or of the holding plate 31, whereby the blocking section 37 of the latch element 27 continues to engage into the latch blocking recess 17 of the cylinder housing 11 and prevents a rotation of the cylinder core 13 about the axis of rotation A (FIG. 1).

(15) The general operation of the shown cylinder lock will be explained in the following mainly with reference to FIGS. 6a and 6a.

(16) The cylinder core 13 is only rotated in the cylinder housing 11 between a closed position and an open position.

(17) FIG. 6a shows the lock in a closed state which is initially characterized in that at least one of the disk tumblers 21 (in the base position of the cylinder lock: each of the disk tumblers 21) is located in the latched position. In the cross-sectional value shown in FIG. 6a, the engagement section 23 of the disk tumbler 21 shown at the very front engages into the tumbler blocking recess 15, whereby the cylinder core 13 is latched with respect to a rotation about the axis of rotation A, apart from a small rotary clearance (FIG. 1). Since the disk tumbler 21 is at least partly in the latched position, the latch element 27 is displaced against the preload direction X such that the blocking section 37 of the latch element 27 engages into the latch blocking recess 17 and additionally blocks the cylinder core 13 with respect to a rotation of the cylinder core 13 about the axis of rotation A, apart from an even smaller rotary clearance (FIG. 1).

(18) In order better to illustrate the special operation of the shown cylinder lock with respect to the making more difficult of a probing of the codings of the disk tumblers 21, the engagement section 23 of the disk tumbler 21 shown at the very front in the representation in accordance with FIG. 6a is not completely introduced into the tumbler blocking recess 15, i.e. this disk tumbler 21 is not completely located in its latched position. The latch element 27, in contrast, is located in its blocking position in the representation in accordance with FIG. 6a. In the state shown, the latch tip 35 catchingly engages partly into the latch reception recess 47 and partly into the latch catching recess 49b and the intermediate elevated portion 51b of the disk tumbler 21 engages into the intermediate recess 43 of the latch tip 35. If, in contrast, the engagement section 23 of the respective disk tumbler 21 is completely introduced into the tumbler blocking recess 15, i.e. if this disk tumbler 21 is completely in its latched position, the latch tip 35, deviating from the representation in accordance with FIG. 6a, only engages into the latch catching recesses 49b, 49b, but no longer into the latch reception recess 47.

(19) The cylinder lock is shown in the open state in FIG. 6b. The open state is initially characterized in that all the disk tumblers 21 are in the unlatched position, i.e. none of the engagement sections 23, 23 of the disk tumblers 21 engage into the tumbler blocking recesses 15, 15 of the cylinder housing 11. In this fully unlatched position of the disk tumblers 21, the latch tip 35 of the latch element 27 is completely received in the latch reception recess 47 of the respective disk tumbler 21, whereby the blocking section 37 of the latch element 27 no longer engages into the latch blocking recess 17 of the cylinder housing 11, but is rather received in the support opening 53 of the holding plate 31. The latch element 27 is accordingly in its release position. Provided that all the disk tumblers 21 are in their unlatched positions and the latch element 27 is thereby also in its release position, the cylinder core 13 can be rotated freely about the axis of rotation A (FIG. 1).

(20) To move all the disk tumblers 21 into their unlatched positions, the key 33 is introduced into the keyway of the cylinder lock which is formed by the key introduction openings 63 aligned with one another (FIG. 1 and FIG. 4) of the disk tumblers 21. The outline of the respective key introduction opening 63 has a first coding section 59a and a second coding section 59b (FIG. 4). The key 33 accordingly has at a first side of a central plane a sequence of first incisions 61a, 61a (FIG. 1) which correspond to the first coding sections 59a of the disk tumblers 21. At a second side of the central plane, the key 33 has a sequence of second incisions 61b, 61b which correspond to the second coding sections 59b of the disk tumblers 21. During the introduction of the key 33 into the keyway, the incisions 61a, 61a, 61b, 61b slide along the coding sections 59a, 59b of the disk tumblers 21, whereby the disk tumblers 21 are displaced out of their latched position against their respective preload. The latch tip 35 of the latch element 27 in this respect slides along the longitudinal side of the respective disk tumbler 21 and successively first catchingly engages into the latch catching recesses 49b, 49b (or 49a, 49a) and finally into the latch reception recess 47.

(21) If an attempt is made in the shown cylinder lock to probe the displacement path in accordance with the method of the probing of the codings, which displacement path the respective disk tumbler 21 covers between the latched position and the unlatched position, there is a considerable difficulty in that a plurality of tangible changes of the movement resistance can occur as a consequence of the mutual catching engagement between the latch tip 35 (including the intermediate recess 42) and the latch catching recesses 49a, 49a, 49b, 49b and the intermediate elevated portions 51a, 51b along a far displacement range. It can thus not be determined or can only be determined with great difficulty in which position of the manipulatively displaced disk tumbler 21 the unlatched position is actually reached in which the latch tip 35 engages into the latch reception recess 47. A high security against picking is thus achieved.

(22) Three specific rotary clearances exist overall in FIG. 6a with respect to a rotary actuation of the cylinder core 13; A first rotary clearance exists between the blocking section 37 of the latch element 27 and the latch blocking recess 17 of the cylinder housing 11; a second rotary clearance exists between the connection section 39 of the latch element 27 and the support opening 53 of the holding plate 31; and a third rotary clearance exists between the engagement section 23 of the at least one disk tumbler 21 and the tumbler blocking recess 15 of the cylinder housing 11. The first rotary clearance is selected as smaller than the second rotary clearance and the second rotary clearance is selected as smaller than the third rotary clearance. The latch element 27 can hereby tilt or cant easily when a torque is exerted onto the cylinder core 13 in the rotary direction of opening, while the blocking section 37 of the latch element 27 engages into the latch blocking recess 17 of the cylinder housing 11. An association of the probed movement resistance with a specific position of the disk tumbler 21 is thus made even more difficult.

REFERENCE NUMERAL LIST

(23) 11 cylinder housing 13 cylinder core 15, 15 tumbler blocking recesses 17 latch blocking recess 19 tumbler openings 21 disk tumblers 23, 23 engagement section 25 latch reception opening 27 latch element 29 holding plate reception recess 31 holding plate 33 key 35 latch tip 37 blocking section 39 connection section 41 groove 43 intermediate recess 45, 45 latch element springs 46a, 46b sides 47 latch reception recess 49a, 49a, 49b, 49b latch catching recesses 51a, 51b intermediate elevated portions 53 support opening 55, 55 disk tumbler springs 59a first coding section 59b second coding section 61a, 61a first incisions 61b, 61b second incisions 63 key insertion opening 65 lateral projection A axis of rotation Y preload direction of the disk tumblers X preload direction of the latch element O rotary direction of opening of the cylinder core