AU3291600A

AU3291600A - Locking device, especially for locking functions in the rear end of a motor vehicle

Info

Publication number: AU3291600A
Application number: AU32916/00A
Authority: AU
Inventors: Paul Kreutzenbeck
Original assignee: Huf Huelsbeck and Fuerst GmbH and Co KG
Current assignee: Huf Huelsbeck and Fuerst GmbH and Co KG
Priority date: 1999-03-19
Filing date: 2000-03-20
Publication date: 2000-10-09
Also published as: JP2002540325A; DE19912321C1; BR0009096A; CN1344346A; KR20010113846A; EP1165914A1; WO2000057010A1

Description

Translation of WO 00/57010 (PCT/EPOO/02437) Locking Device, Especially for Locking Functions in the Rear End of a Motor Vehicle The invention relates to a locking device of the kind stated in the preamble of claim 1. In addition to the device arranged at the rear end of the vehicle, there are further locking devices on the doors of the vehicle which have their own locking members. In order to be able to control the different devices centrally and in a coordinated way, a central locking device is employed which will be referred to as "CL device" for short in the following. This CL device has drives which act onto a CL lever at the individual locking devices and move it between two different pivot positions. In this way, in the normal situation an eccentric lever connected with the CL lever is to be moved into corresponding pivot positions, namely either into a securing position in which the corresponding locking members are ineffective, or into a release position in which the locking members are activated. The locking device has a lock cylinder with a key-actuated cylinder core which is connected with a follower by a positive-locking and/or frictional connection. This follower is arranged coaxially to the already mentioned eccentric lever. Moreover, a drive spring is provided which moves the cylinder core automatically into a zero position after a key actuation, which zero position is between the securing position and the release position. In this zero position the insertion and removal of the key into and out of the cylinder core is possible. Moreover, the cylinder core can be rotated farther by the key into a safe position beyond the securing 1 position in which the eccentric lever is blocked. Moreover, in the safe position the key can be also inserted into the cylinder core and removed therefrom. In the known device of the kind mentioned in the preamble the eccentric lever is fixedly connected with the CL lever for common rotation. These two levers are always synchronously pivotable. This causes operational failure in the safe position of the cylinder core when the lever pair is in its securing position but, triggered by a control command which is received from outside of the device, the CL device wants to move the CL lever into its release position. This causes jamming in the interior of the locking cylinder which prevents insertion of the key into the cylinder core or at least impairs it. Such jams can be caused, for example, between the tumblers to be controlled by the key and the locking channels correlated therewith and arranged within the lock cylinder. Moreover, in the known locking device a rotation of the cylinder core is required about a very large angular distance in order to, starting from the safe position, move the lever pair into the release position in which an actuation of the locking member of the device is exclusively possible. In the known device it is actually necessary to rotate the key, starting from the safe position, past the zero position up to the release position of the cylinder core. This large key rotation is not ergonomic and impedes the easy of operation. It is an object of the invention to develop a reliable locking device of the kind mentioned in the preamble of claim 1 with which 2 the aforementioned operational failures no longer occur and which are characterized by a great ease of operation. This is achieved by the measures listed in the characterizing portion of claim 1 which have the following special meaning. According to the invention, a coupling means is arranged between the CL lever, on the one hand, and the eccentric lever, on the other hand. This has the effect that these two levers are fixedly connected in rotation with one another when the key rotation is carried out within the normal angular distance between the securing position, past the neutral position up to the release position. However, when the safe position is present, according to the invention, a decoupling of the two levers is provided. The aforementioned operational failure in the safe position cannot occur because the CL lever is free and can be entrained without problems from the securing position into its release position without entraining the eccentric lever. Accordingly, jamming cannot occur in the interior of the lock cylinder. Moreover, between the cylinder core and the eccentric lever a coupling member is arranged which couples the cylinder core with the eccentric lever when, starting from the safe position, a key rotation is carried out and when prior to this the CL lever has been moved into its release position. In this case, a small key rotation is sufficient; the cylinder core must be moved from the safe position only into the zero position in order to move the eccentric lever, which was previously in the securing position, into its release position. This small rotational angle provides great ease of operation and facilitates the actuation of the locking device. 3 Further features and advantages of the invention result from the dependent claims, the following description, and the drawings. In the drawings, the invention is illustrated with the aid of one embodiment. It is shown in: Fig. 1 an end view onto the device according to the invention in the viewing direction of arrow I of Fig. 2; Fig. 2 partially broken away, a longitudinal section of the lock cylinder of the device; Fig. 3 a cross-section of the device illustrated in Fig. 2 along the section line III-III indicated therein; Figs. 4a + 4b a cross section of the device of Fig. 2 along the section line IV-IV indicated therein in two different positions, wherein the cylinder core is emphasized by dot hatching; Figs. 5a + 5b partial views of a cross-section of the device according to the invention along the section line V-V of Fig. 2, when the lock cylinder is in its normal position but a corresponding eccentric lever is in a securing and a release position relative to locking members, respectively; 4 Figs. 5c + 5d cross-sectional views corresponding to those of Figs. 5a and 5b of the device when the lock cylinder is in a safe position; Figs. 6a + 6b further partial views of a cross-section of the device illustrated in Fig. 2 along the section line VI-VI when the components are in the positions of Figs. 5a and 5b, respectively; and Figs. 6c + 6d the same cross-sections as in Figs. 6a and 6b when the lock cylinder or the components are in the positions of Figs. 5c and 5d, respectively. The locking device illustrated in Figs. 1 and 2 is provided on the rear end of a vehicle in order to perform locking functions with respect to the rear end hatch. The locking device comprises a lock cylinder 10, best seen in Fig. 2, which is comprised of a cylinder core comprised of two portions 11, 12. The cylinder core 11, 12 is supported in a stationarily positioned housing 13 and can be actuated in rotation by means of a key, not illustrated in detail. The cylinder core is comprised of an outer portion 12, which is provided with a protective cap 14 at its end face and with a key channel 15, best seen in Fig. 1, for receiving the key. The end face of the outer portion 12 of the cylinder core projects with its protective cap 14 from the sheet metal of the car body, illustrated in dashed lines in Fig. 2, to the exterior. From here the key channel 15 is accessible. The tumblers 16 which are actuatable by 5 the key are arranged in this outer portion 12 of the cylinder core; their position is indicated in dash-dotted lines in Fig. 2. The other portion 11 of the cylinder core is fixedly connected with this outer portion 12 for common rotation therewith. This portion 11 projects into the interior of the vehicle so that it will be referred to as "inner portion". The inner portion 11 supports different coaxially arranged components 20, 30, 40. Between the two portions 11, 12 of the cylinder core an overload coupling can be provided which is not illustrated in detail. When a torque is exerted onto the outer portion 12, which torque is below a certain limit value, a rotationally fixed connection between the two core portions 11, 12 is provided. By means of key rotation of the outer portion 12, the inner portion 11 thus also rotates synchronously therewith. However, when by means of a burglary tool or the like a torque which surpasses this limit value is applied onto the outer portion, the overload coupling decouples the inner portion 11 from the outer portion 12 of the cylinder core. The outer portion 12 entrained by the burglary tool rotates freely within the housing 13 so that this rotation is not transmitted onto the inner portion 11 and the components 20, 30, 40 seated thereon. These components include firstly a follower 20 which is rotatably supported on the cylinder core 11 and which has an axial nose 21 as well as a radial nose 22. A stationary housing nose 75 is provided also adjacent to the axial follower nose 21. These noses 21, 75 are positioned relative to the section plane illustrated in Fig. 3 in displaced axial planes and are surrounded by the two legs 26, 27 of a drive spring 25 placed about the cylinder core 11. By means of this drive spring 25, the cylinder core is secured in the zero 6 position illustrated by the vertical line 50. By means of the inserted key, the cylinder core 11 can then be rotated alternatively either into the rotational position illustrated by the line 51 or by the line 51' of Fig. 1. The corresponding angles of rotation indicated in Fig. 1 with 53 or 53' are identical and may be approximately 550, respectively. When the cylinder core 11, 12 is rotated by the key into the rotational position 51 or 51' and the key is then let go of, the cylinder core 11, 12 is then automatically returned by the drive spring 25 into the zero position 50. In order to make this rotation 53, 53' possible and to limit it, the housing 13 according to Fig. 3 is provided with a window 29 which has end stops 28, 28' for the follower nose 22. The latter can be seen in Figs. 5a and 5b. In the section shown therein, only an axial follower finger 23 of the follower 20 is illustrated which is delimited by two radially extending shoulders 24, 24'. In both Figs. 5a, 5b, the follower finger 23 has the same position even though in Fig. 5a a rotation up to the position 51 of Fig. 1 and in Fig. 5b a counter rotation up to the position 51' of the cylinder core 11 have taken place. In this connection, the shoulders 24 in Figs. 5a and 24' in the case of Fig. 5b have interacted with corresponding counter shoulders 34 or 34' of an eccentric lever 30 which is a further component of this device. The eccentric lever 30 is arranged rotatably by means of a bearing member 33 on the cylinder core 11. The bearing member 33 has the aforementioned counter shoulders 34, 34'. By a key rotation in the direction of arrow 18, the eccentric lever 30 reaches the position illustrated in Fig. 5a which is shown in Fig. 1 in solid lines and whose position is indicated by the auxiliary line 31. Accordingly, 7 a first locking member 45 illustrated in Figs. 1 and 2 has been moved into a position in which the corresponding locking members, which are not illustrated in detail, have been made ineffective. In this case, the eccentric lever 30 is thus in a "securing position". The locking member 45 in the present case is a slide which is movable on a guide rod 35 of Fig. 1 wherein the slide can also be moved on the rod 35 into a counter position, not illustrated in detail. In this counter position of the locking member 45, the locking members are activated. When, on the other hand, the cylinder core 11 is rotated by means of the key in the opposite direction illustrated by the arrow 18', the aforementioned shoulders 24' and counter shoulders 34' cooperate and transfer the eccentric lever into the other position 30' which is illustrated in Fig. 5b. This position 30' is illustrated in Fig. 1 by dashed lines. Its position is illustrated by the auxiliary line 31' illustrated therein. In this case, the aforementioned first locking member 45 has been moved into a position, not illustrated in Fig. 1, in which the successive locking members are activated. Upon actuation of an actuator or the like, in this position 30' the lock can be opened. This position 30' is thus the "release position" of the eccentric lever. A further component of the device according to opening is a so called CL lever 40 according to Fig. 6a which is rotationally supported by means of a bearing member 43 with interposition of the already mentioned bearing member 33 on the eccentric lever 30 on the cylinder core 11. The CL lever 40 interacts with a drive of the central locking device already mentioned above. This drive engages by means of a rod a bearing eye 42 of the CL lever 40. The 8 CL lever 40 can be moved either by this drive of the central locking device or, which will be explained in detail in the following, by the aforementioned counter rotation 18' of the key from the position illustrated in Fig. 6a, which is shown in solid lines in Fig. 1 and characterized by auxiliary line 41, into the other position 40' illustrated in Fig. 1 by the dashed lines, which position 40' is shown in Fig. 6b and is identified by the auxiliary line 41'. As can be seen in Fig. 2, the CL lever 40 with its bearing member 43 is seated on the inner end of the cylinder core 11 where it is axially secured by means of a securing ring 19 or the like. According to Figs. 2 and 6a, the two levers 30, 40 are normally connected so as to rotate with one another by coupling means 55. This coupling means 55 in the present case is comprised of a spring-loaded, axially movable pin which is longitudinally slidable in a radial guide 44 of the CL lever 40. As can be seen in Fig. 2, the pin 55 in the axial direction of the lock cylinder 11 can be divided into two members 56, 57 which have different lengths and will be referred to in the following for obvious reasons as coupling member 56 and control member 57. These members 56, 57 have the profile shape illustrated in Fig. 6a. The bearing members 43 and 33 of the two levers 30, 40 have radial penetrations 36, 46 which are penetrated by the pin 55. The pin 55 is spring-loaded by a spring 58 in the direction of arrow 59 of Fig. 6a. Accordingly, the inner end of the control member 57 of the pin 55 is resiliently supported on a control surface 37 of the cylinder core 11. For a better guiding action, the inner end of the control member 57 is shaped to have a round profile while the inner end of the neighboring short coupling member 56 is concavely shaped and does 9 not project radially inwardly past the bearing member 33 of the eccentric lever 30. While the radial penetration 46 is limited by the bearing member 43 to the profile width of the pin 55, the radial penetration 36 in the bearing member 33 is formed with steps in regard to its width and has a different inner width with respect to the two pin members 56, 57. The radial penetration 36 in the area of the coupling member 56 is narrow so that in the situations illustrated in Figs. 6a and 6b a rotational entrainment between the two levers 30, 40 is realized. The two levers 30, 40 are fixedly connected to one another for common rotation and can be moved together either by the aforementioned key rotation 18, 18' or by the drive of the central locking device, also mentioned before, between the aforementioned positions 30, 40, on the one hand, and 30', 40', on the other hand. As a result of the thus obtained activated and ineffective positions of the already described locking member 45 with respect to the successive locking members the positions of the two levers 30, 40 illustrated by the lines 31 or 41 are "securing positions" while the other positions 30', 40' of the two levers illustrated by the lines 31' or 41' are the already described "release positions". The aforementioned stepped radial penetration 36 in the bearing member 33 of the eccentric lever 30 has in the area of the long control member 57 of the pin 55 the already mentioned larger width, illustrated in Fig. 6a, which is limited by rotational end stops 38, 38'. These rotational end stops 38, 38' make possible a pivoting of the CL lever 40 relative to the eccentric lever 30 corresponding to the angular difference 47 illustrated in Fig. 1 between the two positions 40, 40' characterized by the auxiliary 10 lines 41, 41'. This is, as can be seen in Fig. 6d, taken advantage of in the particular situation where the cylinder core 11 is in the so-called "safe position" which is indicated in Fig. 1 by the auxiliary line 52. This safe position 52 of Fig. 1, starting from the zero position 50, is reached only by a key rotation of the cylinder core 11 about an angular distance 54 which is substantially greater than the afore described rotational angle 53. This angular distance 54 in the present case is 900. This angular distance 54 is also illustrated in the cross-sectional illustration of Fig. 4b which shows the safe position 52 of the cylinder core 11, which is shown in a dotted illustration. The zero position 50 of this cylinder core 11 in the same cross-sectional view is illustrated in the preceding Fig. 4a and is marked in Fig. 4b by the auxiliary line 50. In a diametric channel 48 of the cylinder core 11 a spring and two balls 49 are positioned. These balls 49 are forced by the spring force illustrated by means of arrows in Figs. 4a and 4b radially outwardly into the recesses 29 and 29', respectively, which are provided in the annular opening of the follower 20. Accordingly, in the normal situation according to Fig. 4a as well as in the special situation according to Fig. 4b, there is initially a frictional connection between the follower 20 and the cylinder core 11. Moreover, the annular opening of the follower, on the one hand, and the circumference of the cylinder core 11, on the other hand, are provided with non-circular contours. Accordingly, either the rotational end stop 39, in the normal situation of Fig. 4a, or a different rotational end stop 39', in the special situation of Fig. 4b, act between the follower 20 and the cylinder core 11. 11 In the normal situation of Fig. 4a, as already explained with the aid of Figs. 5a and 5b, the follower 20 can be moved from the zero position illustrated by the auxiliary line 50 in the direction of the aforementioned arrow 18, 18' into the afore described rotational securing and release positions 51, 51' of Fig. 1. In Fig. 4a, the two components 20, 11 then move together. This is realized initially because of the aforementioned frictional connection between the two balls 49 and the recesses 29. Moreover, there is a positive-locking connection between these components 20, 11, as can be seen in Fig. 4a. This positive locking connection in the present case is realized by a ball 32 or the like, which is freely moveably arranged in a radial penetration 62 of the follower 20, because the ball 32 engages with a portion of its cross-section a radial depression 63 of the cylinder core 11. So that for the described rotation 18, 18' of the spring core 11 according to Fig. 4a the follower 20 is therefore also positive-lockingly entrained. In the normal situation of Fig. 4a, the two components 20, 11 are thus moved synchronously upon rotation. This changes upon transition from the normal situation into the special situation of Fig. 4b when the cylinder core 11 is moved into its safe position 52 illustrated therein. In the inner surface of the housing 13 a radial counter depression 64 is provided into which the ball 32 is moved upon initial rotation 65 of the initially jointly moving unit 11, 20 according to Fig. 4a. This initial rotation 65 can be greater/identical to the rotational angle 53 described in connection with Fig. 1. After this initial rotation 65, the ball 32 can move into the counter depression 64 and can become disengaged from the radial depression 63 of the cylinder core 11. The ball 32 is forced in the radial penetration 12 62 by the contour surface of the cylinder core 11, shown in Fig. 4b at 66, into the counter depression 64. Now a positive-locking connection between the housing 13 and the follower 20 is achieved. This special position of the follower 20 is illustrated by means of the follower finger 23'' indicated in Figs. 5c and 5d at 23''. After this positive-locking connection has been realized, the follower 20 stops. During the residual rotation 67 of the cylinder core 11 illustrated in Fig. 4a up to the complete angular distance 54 illustrated in Fig. 4b, the two balls 49 are first lifted out of the previous recesses 29, wherein the previous rotational end stop .39 of Fig. 4a is released. The balls drop into the already mentioned rotationally staggered recesses 29' in the interior of the ring of the follower 20 so that the second locking position of Fig. 4b is realized. However, because of the already described non-circular circumferential contour, a rotational end stop 39' is positioned between the two components 11, 20. Accordingly, the angular distance 54 of the rotation of the cylinder core 11 is limited. In the safe position of Fig. 4b the conditions shown in Figs. 5c through 6d can be present. The key channel 15 in the safe position 52 has a position that is perpendicular relative to the preceding zero position 50 of Fig. 5a to Fig. 6b. In this safe position an insertion and removal of the key into and from the cylinder core 11 is possible without problem. This is achieved by a locking channel, not illustrated in detail, in the interior of the housing 13 into which the already described tumblers 16 illustrated in Fig. 2 can penetrate with their ends. Because of the already described mechanical arrangement in the safe position 52 the eccentric lever 30 is principally in its securing position illustrated by the 13 auxiliary line 31 where the corresponding lock is ineffective. As illustrated in Fig. 5c and 5d, the eccentric lever 30 is also blocked in its securing position 31. The follower finger positioned in position 23'' supports with its shoulder 24 the corresponding counter shoulder 34 of the eccentric lever 30. Accordingly, a return rotation by burglary tools or the like in the direction of arrow 68 of Fig. 5c is not possible. In the safe position 52 of the cylinder core 11 a decoupling of the CL lever relative to the eccentric lever 30 takes place, as illustrated in Fig. 6c. This is realized by the already mentioned control surface 37 of the cylinder core 11 which pushes the end of the long control member 57 of the pin 55 radially outwardly counter to the spring force 59. By doing so, the neighboring coupling member 56 of the common pin 55 is moved out of the correlated narrower area in the radial penetration 36 of the eccentric lever 30 and releases with its concave end the corresponding bearing member 33. Accordingly, the decoupled CL lever can be moved from the securing position illustrated in Fig. 6c by the already mentioned drive of a central locking device into its release position 40' illustrated in Fig. 6d. However, the eccentric lever 30 blocked in the safe position 52 does not change its position. In the release position 40' of the lever according to Fig. 6d the locking members therefore cannot be actuated either; the lock is in its ineffective position. Also, in the case of Fig. 6d the pin 55 is in the already described decoupled position because the end of its control member 57 is resiliently supported on the convex projection 69 indicated at 69 of the control surface 37 of the cylinder core 11 which in this case is comprised simply of the circumferential surface of the cylinder core 11. 14 Between the cylinder core 11 and the eccentric lever 30 there is also a special coupling member 60 which in the present case is comprised of a roller. This roller 60 has correlated therewith a concave area 71 of a control profile in the cylinder core 11 and a concave area 72 of a counter profiled on the inner surface of the bearing member 43 of the lever, respectively. Moreover, as is illustrated in Fig. 6d, the bearing member 33 has a radial hole 70 for the roller 60 loosely arranged therein. Because of the blocking position of the eccentric lever 30 in the safe position 52 of Fig. 6c and Fig. 6d and the rotational entrainment in the radial hole 70, the roller 60 is also in the rotational position illustrated at 61. In the securing position 40 of Fig. 6c, the CL lever is still in alignment with the roller 60 with its concave area 72 of the counter profile but this changes in the release position 40' of Fig. 6d because a convex area 73 of the counter profile in the bearing member 43 now presses the ball 60 into the concave area 71 of the cylinder core 11. This convex area 73 is formed simply by the inner annular surface of the lever bearing member 43. When, based on Fig. 6b, the cylinder core 11 is moved from the safe position 52 again into the zero position 50 in the direction of return rotation arrow 18'' of Fig. 6d, the CL lever remains in its release position 40'. When the end of the concave area 71 of the control profile impacts on the roller 60, which was been stationery up to this point, the follower 20 is now also free after the initial return movement which is illustrated in Fig. 4b by the rotational arrow 74. The ball 32 can again drop into the radial depression 63 of the cylinder core 11. Moreover, a locking 15 engagement between the two balls 49 and the other recess pair 29 of the follower 20 is present. The follower 20 is then again automatically returned, as in the case of any normal locking movement, into the zero position 50. The eccentric lever 30 is pivoted in this connection by means of the cylinder core 11 and of the roller 60 into the release position 30". Upon return movement 18'' about the annular distance 54 between the two positions 50, 52, which distance is 900 in this situation, the eccentric lever 30 has thus been pivoted at the same time by the total angular distance 47 illustrated in Fig. 1. The key therefore must not be turned farther than corresponds to the angular distance 54 between 50 and 52. This provides a comfortable simplification of the operation. According to Fig. 6b, both levers 30', 40' are now positioned in the release positions, respectively. The roller 60 is in a rotational position 61' of Fig. 6b, where it is radially aligned again with the concave area 72 of the counter profile belonging to the CL lever. Accordingly, the pin 55 is again in its coupling position where the two levers 30', 40' are again fixedly connected to one another for common rotation. They can be, as desired, moved synchronously into the securing positions 30, 40, illustrated in Fig. 6a, by means of the drive of the central locking device engaging the CL lever 40' of Fig. 6b at 42. With respect to the coupling member 60 the following control movements result. In the key rotation indicated at 18 in Figs. 5b and 6b, the eccentric lever 30 is also entrained by means of the shoulder 24 the follower finger 23, and the counter shoulder 34 of the bearing member 33 so that the radial hole 70 in its bearing member 33 also 16 entrains the roller 60. The roller 60 thus rolls onto the circumferential surface 69 of the cylinder core 11 which then functions as the convex area of the control profile which, according to Fig. 6a, presses finally the roller 60 again into the concave area 72 of the counter profile of the CL lever 40. Now a second positive-locking connection between the two levers 30, 40 is present; in addition to the coupling-active pin 55, the roller 60 also holds the two levers 30, 40 together. 17 List of Reference Numerals 10 lock cylinder 11 cylinder core, inner portion 12 cylinder core, outer portion 13 housing 14 protective cap 15 key channel in 12 16 tumbler in 12 17 sheet metal of car body (Fig. 2) 18 arrow of key rotation 18' arrow of counter key rotation 18'' arrow of return key rotation from 52 (Fig. 6d) 19 securing disc for 43 on 11 (Fig. 2) 20 follower 21 axial nose of 20, follower nose 22 further nose on 20, stop nose 23 follower finger of 20 23'' follower finger in safe position (Figs. 5c, 5d) 24 first radial shoulder of 23 24' second radial shoulder of 23 25 drive spring (Fig. 3) 26 first leg of 25 (Fig. 3) 27 second leg of 25 (Fig. 3) 28 first end stop for 22 (Fig. 3) 28' second end stop for 22 (Fig. 3) 29 first recess in 20 (Figs. 4a, 4b) 29' second recess in 20 (Fig. 4a, 4b) 30 eccentric lever (in securing position) 30' release position of 30 18 31 auxiliary line of securing position of 30 (Fig. 1) 31' auxiliary line of release position of 30' (Fig. 1) 32 ball (Fig. 4a) 33 bearing member of 30 34 first counter shoulder of 33 (Fig. 5a) 34' second counter shoulder of 33 (Fig. 5b) 35 guide rod for 45 36 radial penetration in 33 for 56 and 57 37 concave area of control surface on 11 for 57 (Fig. 6a) 38 first rotational end stop for 57 (Fig. 6a) 38' second rotational end stop for 57 (Figs. 6a, 6d) 39 rotational end stop between 20/11 (Fig. 4a) 39' rotational end stop between 20/11 (Fig. 4b) 40 CL lever (securing position) 40' release position of 40 41 auxiliary line for securing position of 40 (Fig. 1) 41' auxiliary line for release position of 40' (Fig. 1) 42 bearing eye in 40 (Fig. 6) 43 bearing member of 40 44 radial guide in 40 for 55 45 locking member (Fig. 1) 46 radial penetration in 43 for 55 47 angular distance between 40, 40' (Fig. 1) 48 radial channel in 11 (Fig. 4a, 4b) 49 ball in 48 (Fig. 4a, 4b) 50 zero position of 11, vertical line (Fig. 1) 51 auxiliary line for secured rotational position of 11 (Fig. 1) 51' auxiliary line for rotational release position of 11 (Fig. 1) 52 auxiliary line of the safe position of 11 (Fig. 1) 53 rotational angle between 50 and 51 19 53' rotational angle between 50 and 51'(Fig. 1) 54 angular distance between 50, 52 55 coupling means, pin 56 short coupling member of 55 57 long control member of 55 58 spring for 55 (Fig. 6a) 59 arrow of spring load of 55 (Fig. 6a) 60 coupling member, roller 61 auxiliary line of the first rotational position of 60 61' auxiliary line of the second rotational position of 60 62 radial penetration for 32 in 20 (Fig. 4a) 63 radial depression in 11 (Fig. 4a) 64 radial counter depression in 13 for 32 (Fig. 4a, 4b) 65 initial rotation of 11 (Fig. 4) 66 contour surface of 11 (Fig. 4b) 67 residual rotation of 11 (Fig. 4a) 68 return rotation arrow of 30 (Fig. 5c) 69 convex extension of 37 or of 71 (Figs. 6a, 6b) 70 radial hole in 33 for 60 71 concave area of the control profile of 11 (Fig. 6d) 72 concave area of the counter profile of 11 for 60 in 43 (Fig. 6d) 73 convex area of the counter profile in 33 74 initial return rotation of 11 (Fig. 4b) 75 nose in 13 20

Claims

1. Locking device, in particular for locking functions at the rear end of a vehicle, comprising a lock cylinder (10) which has a cylinder core (11, 12) actuated by a key, comprising a follower (20) arranged coaxially to the cylinder core (11) which is connected positive-lockingly (32, 62, 63) and/or frictionally (49, 29; 49', 29') with the cylinder core (11), comprising an eccentric lever (30) arranged coaxially to which, by means of key actuation (18, 18') of the cylinder core (11), is moved by the follower (20) between a safe position (30, 31) for making correlated locking members ineffective and a release position (30', 31') for activating the locking members, comprising a CL lever (40) coaxially arranged to the follower (20) and connected with the eccentric lever (30) so as to rotate therewith, comprising a CL device which moves also the CL lever (40) between a securing position and a release position (40, 41; 40', 41'), comprising a drive spring (25) which automatically returns the cylinder core (11), after a key actuation (18, 18') into a securing position or release position (51, 51'), into a zero 21 position (51) positioned therebetween, in which a first insertion and removal of the key is possible, wherein the cylinder core (11) can be farther rotated into a safe position (52) in which the eccentric lever (30) is blocked in its securing position (31) and a second insertion or removal of the key into the cylinder core (11) is possible, characterized in that between the CL lever (40) and the eccentric lever (30) a coupling means (55) is arranged which connects in the securing position, the neutral position, and the release position (31, 41; 50; 31',41') the two levers (30, 40) together for common rotation but decouples them in the safe position (52), and that between the cylinder core (11) and the eccentric lever (30) a coupling member (60) is arranged which in the safe position (52) fixedly couples the cylinder core (11) with the eccentric lever (30) for common rotation and, upon a return rotation of the key (18'') of the cylinder core (11), moves the cylinder core (11) into the release position (30', 31' ) when, prior thereto, the CL lever has been moved into its release position (40', 41').

2. Locking device according to claim 1, characterized in that the cylinder core has a control surface (37, 69) for the coupling means (55) and the coupling means (55) is spring-loaded against this control surface (37, 69), 22 and that the control of the coupling means (55) between its coupling position and decoupling position relative to the CL lever (40) and of the eccentric lever (30) is realized by the control surface (37, 69).

3. Locking device according to claim 2, characterized in that the coupling means is a pin (55) longitudinally slidably guided in the CL lever (40) or in the eccentric lever (30) which is divided into a short coupling member (56) and a long control member (57), that the pin (55) engages radial penetrations (36, 46) of the eccentric lever (30, 33) and of the CL lever (40, 43), where its coupling member (56) generates a rotational entrainment but its control member has correlated therewith a release (38, 38'), wherein the end stops (38, 38') allow a pivoting of the CL lever (40) relative to the eccentric lever (30) by a corresponding angular difference (47) between the safety position and the release position (31, 31') and that the inner end of its control member (57) is supported resiliently (59) on the control surface (37, 69) of the cylinder core (11).

4. Locking device according to one or several of the claims 1 to 3, characterized in that the coupling member (60) is freely movable and the cylinder core (11) has a control profile (71, 23 69) and the CL lever (40) has a counter profile (72) for the coupling member (60), and that the profile shape of the counter profile (71, 69; 72) effects the switching (61; 61') of the coupling member (60) and thus a rotational entrainment of the eccentric lever (30, 30').

5. Locking device according to claim 4, characterized in that the coupling member is comprised of a roller (60) which is arranged loosely in a radial hole (70) of the eccentric lever (30), that the roller (60) is pressed with a portion of its cross section either radially inwardly into a concave area (71) of the control profile of the cylinder core (11) where, by means of the lever (40') moved into the final securing position (41'), in the last phase of the cylinder return movement (18'') from the safe position (52) into the zero position (50) a fixed connection for common rotation is realized between the cylinder core (11) and the eccentric lever (40'), or that the roller (60) is forced by a convex area (69) of the control profile in the cylinder core (11) with a portion of its cross-section radially outwardly into a concave area (72) of the counter profile in the CL lever (40, 43) and a fixed connection for common rotation is realized between the eccentric lever (30, 33) and the CL lever (40, 43). 24

6. Locking device according to one or several of the claims 1 to 5, characterized in that the eccentric lever (30, 33), on the one hand, and the follower (20, 23), on the other hand, have two shoulders (24, 24') and two counter shoulders (34, 34') cooperating in pairs, respectively, which upon key rotation (18, 18') effect the switching of the eccentric lever (30) between the securing position and the release position (31, 31'), and that the blocking of the eccentric lever (30) in the safe position (52) of the cylinder core (11) is realized by a shoulder (24) on the follower (20, 23'') which then comes to rest against a corresponding counter shoulder (34) of the eccentric lever (30, 33).

7. Locking device according to one or several of the claims 1 to 6, characterized in that the cylinder core (11) is comprised of two portions (11, 12) connected to one another, namely an outer portion (12) which receives the key (15) and an inner portion (11) which supports the follower (20), the eccentric lever (30), and the CL lever (40).

8. Locking device according to claim 7, characterized in that between the two portions (11, 12) of the cylinder core an overload coupling is arranged. 25