EP0320008B1 - Electrically driven door lock - Google Patents

Abstract

The electromotively driven door lock has a bolt (29) which is guided displaceably in a lock case (7) and which is coupled in the two directions of movement, via a push-face mechanism (61, 63), to a control part (43) displaceable transversely relative to the direction of movement of the bolt (29). The control part (43) is driven by an electric motor (37) via a gearwheel mechanism (41) and a rack toothing (59) provided on the control part (43). The electric motor (37) can move the control part (43) beyond the position assigned to the drawn-in bolt (29) towards a latch (9) of the door lock, the control part (43) taking up the latch (9) in the drawing-in direction. For this part of its stroke, the control part (43) can be driven pivotably or else take up the latch (9) via a sloping-face mechanism or a deflecting angle lever. The follower (21) provided for the manual opening of the latch (9) takes up the control part in the drawing-in direction of the bolt (29) via take-up stops (81, 83), so that, if necessary, the door lock can also be released manually. <IMAGE>

Description

The invention relates to an electric motor-driven door lock according to the preamble of claim 1.

From DE-A-36 06 620 an electric motor-driven door lock is known, the bolt of which can be drawn into the lock housing by an electric motor via a gear transmission and can be extended from the lock housing. The output gear of the transmission is designed as a segment gear, which meshes with a rack toothing firmly connected to the bolt. In the retracted position of the bolt, the segment gear wheel extends from the rack teeth and then pulls in the latch via a change lever. The known door lock can thus be controlled electrically, for example by means of an electronically coded key, including the retraction of the latch. However, the latch, which is spring-biased in the extension direction, can also be opened manually using a door handle. In order to be able to manually open the bolt of the door lock in emergency situations or in the event of a failure of the electrical control, an additional mechanical cylinder lock is provided, by means of which a pivoted gear wheel of the gearbox can be switched off from the drive path of the motor and brought into engagement with a drive toothing of the follower nut .

The transmission of the known door lock is comparatively complex, and an additional cylinder lock is required for the manual retraction of the bolt.

It is an object of the invention to reduce the design effort of the known door lock and in particular to simplify the gear coupling the electric motor with the bolt, it being ensured that the bolt can also be pulled in manually, for example in emergency situations, without the gear being manually must be switched or the mechanical components of the electromotive Drive can be affected.

This object is achieved by the features specified in the characterizing part of claim 1.

In the context of the invention, the toothed rack toothing provided for converting the rotational movement of the electric motor into a translational movement is not provided directly on the bolt, but rather on a control part which is displaceably guided transversely to the bolt movement. The control part is coupled to the bolt for both directions of movement of the bolt via inclined push surfaces. The control part can be moved beyond the position assigned to the retracted end position of the bolt and takes the catch in the pulling direction via a driver stop. The trap is also conventionally manually retracted independently of the actuation by the control part via a follower. The gear chain leading from the motor to the bolt does not have to be broken for the manual retraction movement.

The measures of claim 2 allow, in emergency situations, not only to open the latch, but also to pull in the bolt mechanically via the lever handle provided only on the inside of the door. No gearwheels of the transmission have to be switched manually to another transmission chain. The overload clutch also protects the engine and gearbox from damage caused by overloading. The overload clutch can be designed as a slip clutch or snap-in clutch, in particular as a snap-in clutch. If necessary, the overload clutch can also be formed by an intermediate gearwheel which is mounted so as to be radially movable and resiliently biased into engagement with its counter-toothing.

The control part is for the retraction of the bolt Expediently displaceable transversely to the direction of movement of the latch and only acts on the latch in the direction of retraction when it moves beyond the retracted position of the bolt via a driver stop or the like. The translational drive of the trap in the pull-in direction can be implemented in a wide variety of ways, starting from the electromotive-driven control part. In the embodiment according to claim 8, the control part is guided to be translationally displaceable only during the stroke pushing the bolt. In the retracted position, the guide releases the control part for a pivoting movement of its end adjacent to the trap in the pulling-in direction of the trap, so that the control part driven by the electric motor can carry out a pivoting movement and drive the trap directly in the pulling-in direction. In a second variant according to claim 9, the control part, which is guided in a translationally displaceable manner, takes the catch with it via an inclined surface gear in the feed direction. A similar effect is achieved according to claim 10 with an angle lever which deflects the thrust of the control part movable transversely to the trap in a pulling force acting in the direction of the trap.

The control part is expediently guided on the side walls of the lock housing. In the case of mortise door locks, the faceplate, which forms a narrow side wall of the lock housing, is preferably used. In this way, stable and exact guidance can be achieved with relatively little design effort.

The control part is expediently used to secure the bolt against forced insertion or removal. According to claim 14, this is done by perpendicular to the direction of movement of the bolt end portions of the control part coupling with the bolt Cam gear slot reached. According to claim 15, however, as an alternative or in addition to the control part or the bolt, a slot which extends in the direction of movement of the control part and is open at the end can be provided, into which a bolt projection engages on the other part in the retracted end position of the bolt.

Fig. 1

eine Seitenansicht eines elektromotorisch angetriebenen Einsteck-Türschlosses bei ausgeschobenem Riegel und ausgeschobener Falle, wobei der Übersichtlichkeit wegen eine Seitenwand abgenommen ist;

Fig. 2

eine teilweise Schnittansicht durch das Türschloß, gesehen entlang einer Linie II-II in Fig. 1;

Fig. 3

eine Seitenansicht des Türschlosses nach Fig. 1 bei eingezogenem Riegel und ausgeschobener Falle;

Fig. 4

eine Seitenansicht des Türschlosses nach Fig. 1 bei eingezogenem Riegel und motorisch zurückgezogener Falle;

Fig. 5

eine Seitenansicht des Türschlosses nach Fig. 1 bei manueller Öffnung;

Fig. 6

eine Seitenansicht einer in dem Türschloß nach Fig. 1 einsetzbaren Überlastkupplung;

Fig. 7

eine Schnittansicht durch die Überlastkupplung, gesehen entlang einer Linie VII-VII in Fig. 6;

Fig. 8 und 9

Varianten der Überlastkupplung;

Fig. 10

eine Seitenansicht einer Variante eines elektromotorisch gesteuerten Einsteck-Türschlosses, ähnlich dem Türschloß der Fig. 1 bei ausgeschobenem Riegel und ausgeschobener Falle;

Fig. 11

eine Seitenansicht des Türschlosses nach Fig. 10 bei elektromotorisch eingezogenem Riegel und ausgeschobener Falle und

Fig. 12

eine Seitenansicht einer weiteren Variante eines Einsteck-Türschlosses ähnlich dem Türschloß der Fig. 1, bei ausgeschobenem Riegel und ausgeschobener Falle.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Here shows:

Fig. 1

a side view of an electric motor-driven mortise door lock when the bolt is pushed out and the latch is pushed out, a side wall being removed for the sake of clarity;

Fig. 2

a partial sectional view through the door lock, seen along a line II-II in Fig. 1;

Fig. 3

a side view of the door lock of Figure 1 with the bolt and retracted latch.

Fig. 4

a side view of the door lock of Figure 1 with the bolt drawn and the motor retracted latch.

Fig. 5

a side view of the door lock of Figure 1 with manual opening.

Fig. 6

a side view of an overload clutch which can be used in the door lock according to FIG. 1;

Fig. 7

a sectional view through the overload clutch, seen along a line VII-VII in Fig. 6;

8 and 9

Variants of the overload clutch;

Fig. 10

a side view of a variant of an electromotively controlled mortise door lock, similar to the door lock of Figure 1 with the bolt and the latch extended;

Fig. 11

a side view of the door lock of FIG. 10 with the bolt drawn by an electric motor and the latch extended and

Fig. 12

a side view of another variant of a mortise door lock similar to the door lock of FIG. 1, with the bolt pushed out and the latch pushed out.

1 and 2 show a mortise door lock with a lock housing 7 delimited by side wall panels 1, 3 and a faceplate 5 arranged on the narrow side shown opening of the faceplate 5 emerges and the tail 13 is guided on a housing-fixed, in a slot 15 of the tail 13 engaging pin 17. A leg spring 19 supported on the lock housing 7 prestresses the latch 9 in the extending direction. The latch 9 can be retracted against the leg spring 19 by means of a pusher nut 21 pivotally mounted in the lock housing 7 by means of a pusher (not shown) arranged on the inside of the door. For this purpose, the follower nut 21 has a finger 23, which takes the latch 9 with it in the pulling direction via a shoulder 25 of the latch tail 13. A return spring 27 holds the follower 21 in a rest position releasing the latch 9.

In the lock housing 7, a bolt 29 is guided at right angles to the faceplate 5 at a distance from the case 9, which with its locking head 31 passes through an opening (not shown in detail) of the faceplate 5 and is guided with its locking tail 32 within the lock housing 7 between two pins 33, 35 fixed to the housing. The bolt 29 is drawn in and pushed out by an electric motor 37, which also pulls the latch 9 independently of the trigger actuation. The electric motor 37 is controlled by a control circuit, not shown, as described, for example, in DE-A-36 06 620. The controller can respond to an electronically coded key and can comprise a reading device for the key arranged in a lock cylinder channel 39 of the door lock.

The electric motor 37 drives a plate-shaped control part 43 via a gear transmission 41, which is linearly displaceable between the inside of the faceplate 5 and the pins 33, 35 at right angles to the direction of movement of both the latch 9 and the bolt 29. The gear 41 arranged between the latch 9 and the bolt 29 comprises a worm 45 which is seated on the output shaft of the electric motor 37 and which meshes with a worm wheel 49 mounted in the side wall plate 1 on the one hand and a bearing plate 47 fixed to the housing on the other hand. The worm wheel 49 is coupled via an overload clutch 51, which is only explained in more detail below and only transmits a predetermined torque, to a pinion 53 which is arranged coaxially and which in turn meshes with a gear wheel 55. The gearwheel 55 drives the control part 43 via a pinion 57, which engages in a rack toothing 59 running parallel to the faceplate 5, ie parallel to the direction of displacement of the control part 43. The displacement movement of the control part 43, which is perpendicular to the direction of movement of the bolt 29, is made via a slot 61 in the control part, which extends obliquely to both directions of movement, in which a slot on the bolt 29 attached pin 63 engages, transferred to the bolt 29.

Fig. 1 shows the door lock in the locked state, i.e. with bolt 29 fully pushed out of the lock housing 7, in which the control part 43 is placed in its position remote from the latch 9. Fig. 3 shows the door lock when the bolt 29 is retracted, but the latch 9 is pushed out, in which the electric motor 37 has brought the control part 43 closer to the latch 9 while the latch 29 is retracted. As shown in FIGS. 1 and 3, the slot 61 controlling the movement of the bolt 29 is essentially Z-shaped, with the ends of a central portion 65 of the slot which runs obliquely both to the direction of movement of the bolt 29 and to the direction of movement of the control part 43 61 Connect end sections 67, 69 running perpendicular to the direction of movement of the bolt 29. The end sections 67, 69 receive the pin 63 in the fully extended or fully inserted position of the latch 29 and thus secure the violent insertion or removal of the latch 29. As an additional safeguard, a pin 71 is attached to the latch head 31 the fully extended position of the latch 29 engages in a slot 73 of the control part 43 which is open in the direction of movement. The pin 71, which can alternatively also be attached to the control part 43 and then moves into a slot in the bolt head 31, secures the bolt 29 against forced insertion.

The control part 43 also controls the retraction movement of the catch 9. The catch 9 adjacent to the control part 43 carries a finger 75 which, when the bolt 29 is drawn in, moves into a recess in the catch tail 13 delimited by a shoulder 77. The rack toothing 59 extends over the rectilinear region required for the locking movement and parallel to the faceplate 5 and is bent in a region in which the pin 63 of the locking head 31 enters the end section 69 of the slot 61 towards the faceplate 5, so that the pinion 57 meshing with the rack teeth 59 controls the control part 43 around the pin 63 in the Figures swings clockwise. The finger 75 takes, as shown in FIG. 4, the catch 9 in the feed direction. 4 shows the door lock with the bolt 29 drawn in by an electric motor and the latch 9 drawn in by an electric motor. To enable the pivoting movement of the control part 43, the pins 33, 35 guiding the bolt tail 32 are arranged such that the control part 43 for the pivoting movement between the pins 33 , 63 can tilt. The corner adjacent to the faceplate is provided with a flat 79.

The door lock can also be opened manually by pressing the lever handle, regardless of the electric motor drive, even if the bolt 29 is extended (panic function). 5 shows, by turning the handle arranged on the inside of the door, ie on the secured side of the door, the handle nut is pivoted, with which the finger 23 pulls the latch 9 over the shoulder 25 provided on the latch tail 13. At the same time, a projection 81 formed on the follower 21 takes the control part 43 with it in the opening direction of the bolt 29. The projection 81 abuts a projection 83 of the control part 43, for example a bent tab of the control part 43. The forced movement of the control part 43 is transmitted via the inclined surfaces of the slot 61 and the pin 63 to the bolt 29, which is thereby shifted into its retracted position. The overload clutch 51 arranged in the drive path of the transmission 41 between the electric motor 37 and the control part 43 is overcome when the control part 43 is operated manually and uncouples the self-locking worm 45. The overload clutch 51 protects moreover, when the door lock is driven by an electric motor, the electric motor 37 and the gear 43 against overload.

6 and 7 show details of the overload clutch 51 used in the door lock of FIG. 1. In the exemplary embodiment shown, the overload clutch is arranged in the drive path between the worm wheel 49 meshing with the worm 45 and the pinion 53 arranged coaxially with the worm wheel 49. However, the overload clutch 51 can also be provided at any other point on the transmission 41.

The overload clutch 51 of FIGS. 6 and 7 is designed as a latching clutch and comprises a pawl 85 which is pivotably mounted on the worm wheel 49 by means of a pin 87 about a pivot axis parallel to the axis of rotation of the worm wheel 49. The pinion 53, which is seated on a common axis 89 relative to the worm wheel 49, carries a clutch disk 91 which is connected to the pinion 53 in a rotationally fixed manner by means of projections 93. The clutch disc 91 has on its outer circumference a locking recess 95 into which a complementarily shaped locking projection 97 of the pawl 85 engages. A ring segment spring 103, which is guided on mushroom head rivets 99, 101 of the worm wheel 49 on the one side and the pawl 85 on the other hand, tensions the pawl 85 radially against the clutch disc 91 Detent recess 95 of the clutch disc 91 is raised and the pinion 53 is uncoupled from the worm wheel 49.

8 and 9 show variants of the overload clutch which can be used instead of the overload clutch 51 of the door lock of FIG. 1. In the description below are Identical components with the reference numerals of FIGS. 1 to 7 and provided with a letter to distinguish them. For a more detailed explanation, reference is made to the description of FIGS. 1 to 7.

8 shows a slip clutch 51a in the drive path of the transmission between the worm wheel 49a meshing with the worm 45a and the pinion 53a rotatable on a common axis 89a relative to the worm wheel 49a. A friction ring disk 107 made of an elastomer-elastic material sits in a recess 105 of the worm wheel 49a. A clutch disc 91a, which is connected in a rotationally fixed manner to the pinion 53a by means of a positive fit, is in frictional contact with the friction ring disc 107. The axial friction pretension is generated by the elastic properties of the friction ring disk 107, the axial reaction forces being absorbed by the side wall plate 1a of the door lock and the bearing plate 47a of the transmission. It is understood that the axial preload can also be generated by separate springs.

Fig. 9 shows an overload clutch 51b, in which one of the step gears is mounted so that it can move radially, so that when a predetermined torque is exceeded, it can come out of engagement with its counter-toothing. In the overload clutch 51b, the worm wheel 49b, which meshes with the worm 45b, is connected in a rotationally fixed manner to the pinion 53b seated on the common axis 89b. The axis 89b is mounted on both sides of the gears 49b, 53b in bushings 109, 111 made of an elastomer-elastic material. The bearing bushes 109, 111 are seated in the side wall plate 1b of the door lock or the bearing plate 47b of the transmission and absorb the radial evasive movement of the gear wheels 49b, 53b or their axis 89b in a springy manner when the drive path is overloaded. It is understood that the axis 89b is also guided radially deflectable in some other way and radially resilient can be biased. The axis 89b can in particular be guided radially in elongated holes in the plates 1b, 47b.

Variants of the plug-in door lock driven by an electric motor are explained below, which differ from the door lock of FIG. 1 essentially only in the type of coupling of the control part to the latch. Components having the same effect are identified by reference numerals in FIG. 1 and, to distinguish them, by an additional letter. For a more detailed explanation of the structure and the mode of operation, reference is made to the description of FIGS. 1 to 7. The variants of the overload clutch explained with reference to FIGS. 8 and 9 can also be used in the variants of the door lock explained below.

The control part 43c of the door lock shown in FIGS. 10 and 11 is in turn guided displaceably between the faceplate 5c on the one hand and guide pins 33c, 35c of the bolt tail 32c at right angles to the direction of movement of the bolt 29c and coupled to the bolt 29c via the oblique push slot 61c and the guide pin 63c . The control part 43c is guided in a linearly displaceable manner and carries at its end adjacent to the case 9c a thrust finger 113 which is opposed by an oblique push surface 115 on the case 9c. FIG. 10 shows the door lock with the bolt 29c pushed out, in which the electric motor 37c has shifted the control part 43c via the gear 41c and the rack toothing 59c, which in this embodiment is entirely straight, into its position remote from the latch 9c. 11 shows the door lock with solid lines 29c with the electric motor retracted. In this position, the thrust finger 113 has approached the inclined thrust surface 115 of the latch 9c. If the control part 43c is driven further in the pulling direction of the bolt 29c, the thrust finger takes 113 the trap 9c in the retraction direction up to the retracted position shown in broken lines in FIG. In the case of the catch-in stroke of the control part 43c, the pin 63c engages in the end section 69c of the oblique push slot 61c which extends in the direction of displacement of the control part 43c. The oblique push surface 115 forms the boundary of a recess in the latch 9c, so that the latch can also be pulled in manually via the door handle, regardless of the electromotive adjustment of the latch 29c. The overload clutch 51c arranged in the drive path of the transmission 41c between the electric motor 37c and the control part 43c in turn protects the drive path against overload and enables the follower 21c or the control part 43c to unlock and open the door lock in emergency situations via the driving stops 81c, 83c.

The plug-in door lock of FIG. 12, which can be driven by an electric motor, in turn has a control part 43d which is guided along the faceplate 5d and which is coupled to the bolt 29d for both directions of movement via an oblique push slot 61d. The electric motor 37d drives the control part 41d in both directions of movement via the gear 41d and the rack toothing 59d provided on the control part 43d. For driving the latch 9d in the retraction direction, an angle lever 117 is pivotally mounted on the lock housing 7d, which is carried with its first arm 119 by a stop surface 121 of the control part 43d adjacent to the latch 9d to the latch 9d and with its other arm 123 via the on the shoulder tail 13d provided shoulder 77d takes the trap 9d in the pulling direction. 12 shows the door lock with solid lines 29d and the latch 9d extended. The control part 43d is in its position remote from the latch 9d. If the control part 43d is approached by the electric motor 37d to the latch 9d, the bolt 29d is retracted, and in the case of the retracted position of the bolt 29d beyond the stroke of the control part 43d, the latch 9d is subsequently also pulled in via the angle lever 117. Fig. 12 shows with dashed lines the control part 43d and the angle lever 117 with the trap 9d retracted.

The overload clutch 51d provided in the drive path of the transmission 41d in turn protects the drive path against overload and allows the locked door lock to be opened manually by actuating the handle. The follower nut 21d carries a driver stop 81d, which takes the control part 43d in the opening direction of the bolt 29d via a counter-stop, here in the form of a recess 83d into which the stop 81d engages.

For the additional securing of the bolt 29d against forcible insertion, a projection 125 is formed on the side of the control part 43d remote from the catch, which can be supported on a pin 127 fixed to the housing when the bolt 29d is fully inserted. This type of additional slide-in protection can also be provided in the door locks explained above.

Claims (15)

1. An electromotively driven door lock, comprising a lock housing (7), a latch (9) which can be retracted into the lock housing (7) against a push-out spring (19) via a handle, a bolt (29) displaceable between a retracted position and an extended position and an actuator (37, 41, 43) with an electric motor (37), with a gearing (41, 43) coupling the electric motor (37) to the bolt (29) for both directions of movement and with a driving device (75, 77; 113, 115; 117) for the latch (9), which, upon actuation of the gearing (41, 43) in the direction of retraction of the bolt (29), drives the latch (9) in the retraction direction beyond the retracted position of the bolt (29), characterized in that the actuator (37, 41, 43) comprises a control portion (43) guided displaceably on the lock housing (7) perpendicularly to the direction of movement of the bolt (29), which control portion (43) is coupled with the bolt (29) via a cam mechanism (61, 63) with thrust surfaces running at an angle to the directions of movement of the bolt (29) and of the control portion (43) and which, upon its movement associated with the direction of retraction of the bolt (29) and driving the latch (9), can be moved beyond the position associated with the retracted bolt (29).
2. A door lock according to claim 1, characterized in that an overload coupling limiting the transmissible torque is arranged in the drive path of the gearing (41, 43) between the electric motor (37) and the control portion (43) and in that a push nut (21) operable by means of the handle carries a drive stop (81) which, by means of a counter stop (83) on the control portion (43), drives the control portion (43) upon the latch retraction movement of the push nut (21) in the bolt retraction direction.
3. A door lock according to claim 2, characterized in that the overload coupling is constructed as a sliding coupling (51a).
4. A door lock according to claim 2, characterized in that the overload coupling (51) is constructed as a detent coupling.
5. A door lock according to claim 4, characterized in that the detent coupling (51) couples together two coaxially arranged toothed wheels (49, 53) of a stepped gear and comprises a stop catch (85) which is accommodated radially swivellably on the toothed wheel (49) of larger diameter and which engages resiliently in a radial recess (95) in the toothed wheel (53) of smaller diameter.
6. A door lock according to claim 2, characterized in that, to form the overload coupling (51b), the gearing (41, 43) comprises an intermediate toothed wheel (49b) accommodated radially movably and in resiliently biased engagement with its countertoothing.
7. A door lock according to any one of claims 1 to 6, characterized in that the gearing (41, 43) is constructed as a toothed wheel gearing, whose output pinion (57) meshes with a toothed rack (59) extending on the control portion (43) in the direction of displacement thereof.
8. A door lock according to claim 7, characterized in that the control portion (43) for the retraction movement of the bolt (29) is displaceable towards the latch (9) perpendicularly to the direction of movement thereof and comprises a drive stop (75) adjacent the latch (9) and which may be brought into engagement with the latch (9) when the bolt (29) is in the retracted position, in that the control portion (43) is guided displaceably in a guide (5, 33, 35), which permits a swivel movement of the control portion (43) in the retraction direction of the latch (9) when the bolt (29) is in the retracted position and in that the area of the toothed rack (59) driving the control portion (43) beyond the position associated with the retracted bolt (29) runs perpendicularly to the area of the toothed rack (59) driving the bolt (29).
9. A door lock according to any one of claims 1 to 7, characterized in that the control portion (43c) for the retraction movement of the bolt (29c) is displaceable towards the latch (9c) perpendicularly to the direction of movement thereof and, upon its displacement in the retraction direction of the bolt (29) beyond the position associated with the retracted bolt (29c), drives the latch (9c) over a thrust surface (115) of a cam mechanism (113, 115) driving the latch (9c) in the retraction direction, said thrust surface (115) running at an angle to the directions of displacement of both the control portion (43c) and the latch (9c).
10. A door lock according to any one of claims 1 to 7, characterized in that the control portion (43d) for the retraction movement of the bolt (29d) is displaceable towards the latch (9d) perpendicularly to the direction of movement thereof and comprises a drive stop (121) adjacent the latch (9d), which drive stop (121), upon its displacement in the retraction direction of the bolt (29d) leading beyond the position associated with the retracted bolt (29d), drives the latch (9d) in the retraction direction by means of an angular lever (117) accommodated swivellably on the lock housing (7d).
11. A door lock according to any one of claims 1 to 10, it being constructed as a mortise lock whose bolt (29) and latch (9) are displaceable at right angles to a lock plate (5) forming a narrow side wall of the lock housing (7), characterized in that the control portion (43) is guided displaceably on the inside of the lock plate (5).
12. A door lock according to claim 11, characterized in that the gearing (41, 43), including the toothed rack (59), is arranged in the region of the lock housing (7) between the bolt (29) and the latch (9).
13. A door lock according to any one of claims 1 to 12, characterized in that the cam mechanism (61, 63) coupling the bolt (29) with the control portion (43) comprises a slit (61) in the control portion (43), the slit (61) cunning at an angle to the directions of movement of the bolt (29) and of the control portion (43), and a pin (63) which is on the bolt (29) and which engages in the slit (61).
14. A door lock according to claim 13, characterized in that the slit (61) has a Z-shape, end sections (67, 69) running substantially at right angles to the direction of movement of the bolt (29) adjoining a central section (65) of the slit (61) running at an angle to the directions of movement of the bolt (29) and ofthe control portion (43).
15. A door lock according to any one of claims 1 to 14, characterized in that the bolt (29) and the control portion (43) are provided with locking members (71, 73) associated with each other and securing the extended bolt (29) against being pushed back into the lock housing (7), one of which locking members (71, 73) is constructed as a slit (73) open at the end and running substantially in the direction of movement of the control portion (43) and the other is constructed as a bolt projection (71) which can be introduced into the slit (73) when the bolt (29) is in the retracted position.

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