DE20116796U1 - Actuating gear, in particular lock for an espagnolette fitting and espagnolette fitting with such an actuating gear - Google Patents

Description

PATENT ATTORNEYS

Dipl.-Ing. A. Wasmeier

Dipl.-Ing. H. Graf

Authorized before the European Patent Office + Trade Mark Office · Professional Representatives before the European Patent Office + Trade Mark Office Patent Attorneys PO Box 10 08 26 93008 Regensburg

German Patent and Trademark Office Zweibrückenstr.

80297 Munich

D-93008 REGENSBURG P.O. BOX 10 08 26

D-93055 REGENSBURG GREFLINGERSTRASSE 7

Telephone (0941)79 20 85

(0941)79 20

Fax (0941)79 5106

E-mail: wasmeier-graf@t-online.de

Your Reference Your Ref.

Your Message Your Letter

Our Ref.

G/g 20.304/1

Date

11 October 2001 gr-el

Applicant:

Gretsch-Unitas GmbH Building fittings
Johann-Maus-Str. 3 71254 Ditzingen

Title:

Actuating gear, in particular lock for a drive rod fitting and drive rod fitting with such an actuating gear

A203041.DOC 11.10.2001

Actuating gear, in particular lock for a drive rod fitting and drive rod fitting with such an actuating gear

The invention relates to an actuating gear, in particular a lock, for a drive rod fitting according to the preamble of patent claim 1 or 3 and to a drive rod fitting with such an actuating gear according to the preamble of patent claim 28.

Lifting and sliding doors for buildings are known, whereby the respective door leaf of such a door is lowered on seals when closed and locked against movement and is raised to open using a manually operated actuating gear which is provided on the door leaf and interacts with a lifting fitting on the door leaf via a drive rod fitting. In the simplest case, the corresponding actuating gear then has two states, one of which corresponds to the lowered door leaf and one to the raised door leaf. However, lift-sliding doors with an additional tilting function are also known, where the door leaf can be tilted when lowered, so that the actuating gear then has a total of three states.

An actuating gear of the generic type is known (DE 83 20 034 U1). This actuating gear, which is particularly suitable for the drive rod fitting of a lift-slide door for buildings, comprises, among other things, an actuating slide or lever arranged in a housing of the actuating gear, which is connected in terms of drive to a drive rod of the drive rod fitting via a nose-like coupling section and is guided in a first axial direction in the housing that includes its longitudinal extension, as well as a further lever that is rotatably mounted in the housing and can be pivoted by a hand or lifting handle. This is connected in terms of drive to the actuating lever via a rocker and two joints, so that the actuating lever can move the

Drive rod to achieve a maximum stroke. The known actuating gear, designed as a lifting gear, comprises a total of three levers and two joints connecting these levers. The construction is not only complex, but also requires a relatively large amount of space in the housing for the levers and their movement.

It is also known to integrate the actuating gear into a lock (DE 78 16 563 UI), which then has a locking mechanism that can be operated via a locking cylinder, with which the actuating gear and/or a drive rod of the drive rod fitting that is connected to this gear can be locked in at least one state of the actuating gear. The disadvantage here is that this locking mechanism consists of a large number of individual parts, which means increased construction effort and requires more space inside the housing of the actuating gear or the lock.

The object of the invention is to develop an actuating gear, for example a lock of the type mentioned at the beginning, in such a way that the number of required functional elements is reduced while maintaining perfect and safe function.

To solve this problem, an actuating gear is designed according to patent claim 1 or 3. A drive rail fitting with such a gear is designed according to patent claim 28.

The operating gear or the drive rod fitting according to the invention are suitable for lift-slide doors, but also for lift-slide windows, in each case with or without a tilt function. Despite the simplified construction, the operating gear can be designed in such a way that at least in an extreme or end position of a lifting handle or a nut arranged rotatably in the housing and cooperating with the lifting handle, an undesirable displacement of the drive rod of the drive rod fitting and/or

it is not possible to operate the handle of the window or door in question inadvertently.

Only two levers are required for the actuating gear designed as a lifting gear. In the corresponding design of the actuating gear or lock according to the invention, only a single bolt serves as the locking mechanism, which can be moved between a locking and non-locking position by pivoting about a bolt axis and by simultaneously moving radially to this bolt axis, preferably by the locking cylinder in question or a control cam or driver of this locking cylinder interacting directly with the bolt or a control surface formed on this bolt.

In the context of the present invention, "nut" is generally understood to mean a one- or multi-part functional element which is rotatably mounted in the housing of the actuating gear and is connected to the manually operable lever handle via a gear and to which, when the gear is designed as a lever gear, the actuating slide or lever which directly interacts with the drive rod is eccentrically linked via the joint.

Further developments of the invention are the subject of the dependent claims. The invention is explained in more detail below with reference to exemplary embodiments and the figures. They show:

Fig. 1 shows a simplified representation of the lock of a lift-and-slide door with tilt function, attached to a faceplate of a drive rod fitting, in a first state with the drive rod not blocked or locked by the bolt;

Fig. 2 the lock of Figure 1 in its first state, but with the drive rod locked by the bolt or locking cylinder;

Fig. 3 shows the lock of Figure 1 in a second state with the drive rod not locked by the locking cylinder or the bolt;

Fig. 4 the lock of Figure 1 in the second state, but with the

Locking cylinder or the bolt locked drive rod; Fig. 5 in the direction of arrow A of Figure 1 a front view of the

Lock with faceplate removed;
Fig. 6 in side view a partial length of the U-shaped faceplate together with the space between the legs of this faceplate

captured castle of figures 1 - 5;
Fig. 7 shows a simplified partial view of a lock according to another possible embodiment of the invention in the region of the bolt.

The lock, generally designated 1 in Figures 1-6, is suitable for use on lifting and sliding doors and, in the embodiment shown, is particularly suitable for use on lifting and sliding doors with a tilting function, where the closed door can be tilted. The elongated lock 1 has an upper side Y, a lower side 1", a longer front side 1"' running parallel to a longitudinal axis L of the lock 1, and a rear side 1"" also running in the direction of the longitudinal axis L.

The lock 1 essentially consists of a lock housing 2, which in the embodiment shown is made up of two plates 2' and 2" made of sheet steel by bending and punching, which in the representation chosen for Figures 1-6 are connected to one another in a suitable manner and at a distance from one another on the top side Γ of the lock 1 and on the bottom side 1" of the lock 1 and also in between them, and accommodate the essential functional elements of the lock 1 between them. The housing 2 and its plates 2' and 2" are designed to be mirror-symmetrical to a center plane M, which is parallel to the drawing planes of Figures 1-4 and perpendicular to the drawing plane of Figure 5.

In the lock housing 2 or in the plates 2' and 2", a nut 3 is rotatably mounted approximately in the middle of the housing 2, namely by an angle of approximately 180° about an axis perpendicular to the plane of the plates 2' and 2" or to the center plane M.

The nut 3 is provided with the usual square opening for the square of a rotary or lifting handle. The nut 3 also has a lever 5 which is firmly connected to this nut and projects radially to one side in relation to the axis of rotation, to which one end 7' of a gear or operating lever 7 is articulated by means of an articulated bolt 6. The axis of the articulated bolt 6 lies parallel to the axis of rotation of the nut 2 and thus in turn perpendicular to the center plane M.

The lock 1 is used together with a drive rod fitting 8, the faceplate rail 9 of which is mounted in a groove of a rebate of the relevant lifting rail door in the manner known to those skilled in the art and essentially consists of a U-profile with the two legs 9' and the yoke section 9" connecting these legs. The drive rod 10 of the drive rod fitting 8 is accommodated in this faceplate rail profile so that it can be moved in the longitudinal direction of the profile for a predetermined stroke H. The lever 7 serves to actuate this drive rod 10, which is made from sheet steel by stamping and which rests with one of its surface sides against the inner surface of the yoke section 9" and is guided with its long sides on the inner surfaces of the legs 9'. The fittings of the lifting-sliding door are actuated in a known manner via the drive rod 10, including the locking elements and the elements for raising and lowering the door.

The lever 7, which is made from flat material, for example from sheet steel by stamping, is oriented with its longitudinal extension parallel or approximately parallel to the longitudinal direction L of the housing 2 at least in the two end or extreme positions of the nut 3 (Figures 1 and or 3 and 4) and is guided in the housing so as to be displaceable in the direction of this longitudinal axis, which runs parallel to the faceplate 9 or to the stroke H. To actuate the drive rod 10, the lever 7 engages with its other end 7" or with a section 7'" designed there as a driver in an opening 11 of the drive rod 10.

The lock 1 is accommodated with its lock housing 2 between the legs 9' of the faceplate 9 and is secured at the upper and lower ends at 12 and 13 by

Riveting to the legs 9'. The side of the housing 2 facing the yoke section 9" forms the front 1'" of the lock 1. The driver 7'" projects beyond this front 1'" to such an extent that it reaches into the immediate vicinity of the inner surface of the yoke section 9" and thus reliably engages in the opening 11. With its rear side 7"" facing away from the driver T" and running parallel to the longitudinal axis L, the lever 7 is supported against a bushing 14 inside the lock housing 2.

As the figures further show, the lever 7 is designed to be angled in the area of its end 7', in such a way that in the state shown in Figures 1 and 2 the hinge pin 6 is located below the opening 4 or the axis of rotation of the nut 3 and in the second state in Figures 3 and 4 above the axis of rotation of the nut 3, in such a way that the axis of the hinge pin 6 lies with the axis of rotation of the nut 3 in a common plane which includes the longitudinal axis L and is oriented parallel to the direction of movement or stroke H of the drive rod 10. As a result, in the two extreme positions of the nut 3, which (extreme positions) are defined by stops 15 and 16 which interact with the lever 5 and are produced by stamping from the material of the plates 2' and 2", it is not possible to move the drive rod 10 in an impermissible manner by applying force to this drive rod.

In order to guide the lever 7 in the axial direction perpendicular to the center plane M, further stops or systems 17 are created in the plates 2' and 2" , against which the lever 7 rests with its surface sides between its two ends 7' and 7" .

On the outer surfaces facing away from each other, the plates 2' and 2" are provided with further stops or projections 18 produced by embossing, which, when the lock 1 is mounted on the faceplate 9, engage in recesses 19 in the legs 9' and thereby additionally secure the lock 1 on the faceplate 9 against axial displacement (Figure 6).

In the lock housing 2, a bolt 20_ is provided in the longitudinal direction L below the nut 3, which interacts with a locking cylinder mounted in the lock 1 but not shown, in order to lock or release at least the drive rod 10. The keyhole-like opening 21 for this locking cylinder is shown, with its longer cross-sectional side parallel to the longitudinal axis L.

The bolt 20 can be pivoted about a bolt axis perpendicular to the central plane M and at the same time can also be moved in axial directions parallel to the central axis M, i.e. radially to the bolt axis, in the lock housing 2, namely on a bearing bush 22. For this purpose, the bolt 20 has a bearing opening 23, the cross section of which is larger than the cross section of the bearing bush 22, which is located between the opening 21 for the locking cylinder (not shown) and the nut 3 or the axis of rotation of this nut 3. In the area of the bearing opening 23, a compression spring 24 is provided which acts between the bearing bush 22 and a counter bearing on the bolt 20 in such a way that this spring 24 exerts a force on the bolt 20 radially to the bearing bush 22 and presses the bolt 20 in the non-locking state (Figures 1 and 3) with the edge area of the bearing opening 23 remote from the opening 21 or the locking cylinder (not shown) against the bearing bush 22.

The bolt 20 has a circumferential contour which is essentially determined by the following sections or elements and which adjoin one another in an assumed circumferential direction, for example clockwise (arrow B):

- On the side facing the opening 21, a control surface 26 which interacts directly with a control cam 25 of the locking cylinder and which is concave about axes perpendicular to the central axis M or parallel to the axis of the bearing bush 22,

- a nose 27 adjoining the control surface 26 in the direction of the lock front side 1'",

- a locking lug 28 which extends over a concave peripheral section and projects from the bolt 20 in the direction of the drive rod 10,

- a further locking lug 29 following the locking lug 28 over a concave peripheral section, which protrudes over the upper side of the latch 20 facing away from the control surface 26 and, in the embodiment shown, lies with its longitudinal extension approximately parallel to the axis 24' of the spring 24, and

- following the locking lug 29 in the direction B, a convexly curved section 30 which annularly encloses the bearing opening 23 and then finally merges into a lug 31 which forms the other end of the control surface 26 remote from the lug 27.

On the front side T" of the lock housing 2, a support and sliding guide 32 is formed by angled tabs of the plates 2' and 2", on which the locking nose 29 slides with its side facing the front side 1'". Furthermore, on the front side 1'", again by angled tabs of the plates 2' and 2", a catch 33 is formed, which interacts with the nose 27 of the bolt 20 in the manner described in more detail below.

By means of impressions 34 and 35 in the plates 2' and 2", guides or projections for the bolt 20 are formed in the interior of the lock housing 2, which prevent incorrect positioning of this bolt.

The function of the lock 1 can be described as follows: Figure 1 shows the lock 1 in a first state in which the drive rod 10 is in the lower position of its stroke H and which corresponds to the lowered state of a lift-slide door. In this state, the hinge pin 6 is located below the axis of rotation of the nut 3, in such a way that the axis of the hinge pin 6 and the pivot axis of the nut 3 are arranged in a common plane including the longitudinal axis L. The bolt 20 is in a position in which neither the drive rod 10 nor the nut 3 are blocked by this bolt.

From the non-locking position shown in Figure 1, the bolt 20 is in a locking position of Figure 1 which locks both the nut 3 and the drive rod 10.

2, namely by correspondingly operating the locking cylinder and thus the control cam 25 interacting with the control surface 26. The bolt 20 is raised against the action of the spring 24 in the direction of the nut 3 and away from the locking cylinder radially towards the bearing bush 22, at the same time pivoted in the direction of arrow B about the axis of the bearing bush 22 and also moved slightly in an axial direction perpendicular to the longitudinal axis L radially towards the bearing bush 22 towards the front T" so that the locking nose 28 engages in a locking opening 36 of the drive rod 10 and thus blocks the drive rod 10 against displacement. The locking nose 29 is arranged between the guide 34 and the end of the lever 5 and thus prevents the nut 3 from pivoting out of the position shown in Figure 2. The nose 27 rests on the catch 33. The tensioned spring generates a torque around a value formed by the free end of the nose 27 and the catch. Bearing in the direction of arrow B, so that the bolt 20 is secured in the locking position by the tensioned spring 24.

Furthermore, as Figure 2 shows, the axis 24' of the spring 24 in this locking position of the bolt 20 no longer runs radially to the axis of the bearing bush 22, but tangentially to an imaginary circular line around the axis of the bearing bush 22, in such a way that the axis of the bearing bush 22 and the nose 27 resting against the catch 33 are provided on different sides of the axis of the spring 24, whereby a further over-center effect is obtained to secure the locking position of the bolt 20, which must be overcome when the bolt 20 is returned to the non-locking position.

The return of the bolt 20 into the non-locking position is again carried out by corresponding actuation of the locking cylinder via the control cam 25, which then interacts with the part of the control surface 26 formed on the nose 31, in such a way that the nose 27 is pulled off the catch 33 against the over-center effect of the spring 24 and the bolt 20 is pivoted back into its non-locking position.

Figures 1 and 3 illustrate that in this non-locking position of the bolt 20, the axis 24' of the compression spring 24 is not only radial to the axis of the bearing bush 22, but also approximately the point at which the bolt 20 rests against the bearing bush 22 in the area of its bearing opening 23 is located on this axis 24' and that, furthermore, the shape of the bearing bush 22 means that the spring 24 is at its greatest relaxation. The spring 24 therefore generates practically no torque on the bolt 20, so that it is in a stable, non-locking position.

When the bolt 20 is not locked, the drive rod 10 can be moved into its upper lifting position by turning or pivoting the nut 3 via the levers 5 and 7, which corresponds, for example, to the raised position of the door in the case of a lift-and-slide door without a tilt function and to the tilted position of the lowered door in the case of a lift-and-slide door with a tilt function. In this upper lifting position of the drive rod 10, the hinge pin 6 is located above the pivot axis of the nut 3, with the pivot axis of the nut 3 and the axis of the hinge pin 6 in turn being arranged in a plane that includes the longitudinal axis L, so that the drive rod 10 is secured against unauthorized pushing back from the upper lifting position simply by this arrangement of the hinge pin 6 in relation to the axis of rotation of the nut 3 via the lever 7.

To lock the drive rod 10, the bolt 20 can also be moved into the locking state shown in Figure 4 by actuating the locking cylinder accordingly in this second state of the lock 1, which differs from the state in Figure 2 only in that the locking lug 28 does not engage in the locking opening 36, but in a further locking opening 37 provided on the drive rod 10.

On the underside 1" of the lock 1 or the lock housing 2, a nose 38 is provided, into which one end of a spring (not shown) can be hooked in a manner known per se, which spring engages with its other end on the drive rod 10 and pre-tensions it upwards in the stroke direction H in order to

to achieve the gentlest possible lowering of the drive rod 10 and thus of the respective door and to avoid a banging of the lever handle connected to the nut 3 when lowering the door, which is at least unpleasant for the operator.

Figure 7 shows a simplified representation of a further possible embodiment of a lock 1a, which differs from the lock 1 essentially only in that the bolt 20a there, which corresponds to the bolt 20 in terms of its function and design, has on at least one side facing a plate 2a' of the housing 2a on the nose 31 or at the transition of the nose 31 to the rest of the bolt 20, which engages in a recess 40 of the plate 2a' and there, due to the action of the spring 24, rests against an edge region 41 forming a slotted guide and located away from the axis of the bearing bush 22. The edge region 41 has on both sides of a section 41' projecting into the recess 40 a section 41" or 41'", which is formed by a trough-like extension of the opening 40 and of which the section 41" receives the guide projection 39 in the non-locking state of the latch 20a and the section 41'" receives the guide projection 39 in the locking state of the latch 20a.

The invention has been described above using exemplary embodiments. It is understood that changes and modifications are possible without thereby departing from the inventive concept underlying the invention. For example, it is possible to provide ring-like sliding parts made of a suitable, low-friction material, for example plastic, on the nut 3 where the nut 3 is rotatably mounted in the plates 2' and 2".

List of reference symbols Lock 1.1a Lock top V Lock bottom 1" Lock front V" Lock back &Lgr; ftft Lock housing 2.2a Housing board 2', 2", 2a' Nut 3 Square opening 4 lever 5 Articulated bolt 6 Operating lever or slider 7 Lever end 7', 7" Driver 7'" Lever back •jim Espagnolette fitting 8th Faceplate 9 leg 9' yoke section 9" Drive rod 10 Drive rod opening 11 Rivets 12, 13 Sliding bush 14 attack 15, 16 Attachment 17 head Start 18 Recess 19 bars 20, 20a Opening for locking cylinder 21

1 ·: ^: . &Iacgr; π. Γ: 1

22 Bearing bush 23 Warehouse opening 24 Compression spring 24' Spring axle 25 Control cam 26 Control surface 27 Nose 28.29 locking lug 30 Circumferential section 31 Nose 32 Sliding surface 33 Rest 34,35 Leadership advantage 36,37 Locking opening 38 Nose 39 Guide pin 40 opening 41 Border area or backdrop 41', 41", 41"' Section 42 Sliding part A Viewing direction B Circumferential or swivel direction H Drive rod stroke L Longitudinal axis of the lock or lock housing M Middle level

Claims (28)

1. Actuating gear, in particular a lock, for a drive rod fitting ( 8 ) with a drive rod ( 10 ), with an actuating slide or lever ( 7 ) which can be coupled directly to the drive rod ( 10 ), which can be moved in a housing ( 2 ) at least in a first axial direction (L) by rotating a nut ( 3 ) mounted in the housing ( 2 ) by a predetermined stroke (H) for actuating the drive rod ( 10 ) and is part of a lever gear which connects the nut ( 3 ) to the drive rod ( 10 ) in a driving manner, which in addition to the actuating lever ( 7 ) has a further lever ( 5 ) connected to the nut ( 3 ) with a joint ( 6 ) which is radially offset with respect to the axis of rotation of the nut ( 3 ), characterized in that the actuating lever ( 7 ) is connected with one end ( 7 ') directly to the further lever ( 5 ) is articulated. 2. Actuating gear according to claim 1, characterized by a locking mechanism accommodated in the housing ( 2 ) which can be switched by a locking cylinder or by a control cam ( 25 ) provided on this locking cylinder between a locking state in which the locking mechanism locks the lever gear and/or the drive rod ( 10 ) and a non-locking state, wherein the locking mechanism is formed by a single bolt ( 20 , 20a ) which interacts with the locking cylinder or its control cam ( 25 ) and which has at least one locking lug ( 28 , 29 ) which, in the locking position, blocks the movement of the drive rod ( 10 ) and/or the lever gear ( 5 , 7 ) and, in the non-locking position, releases the drive rod ( 10 ) and/or the lever gear ( 5 , 7 ). 3. Actuating gear, in particular a lock, for a drive rod fitting ( 8 ) with a drive rod ( 10 ), with a nut ( 3 ) which is rotatably mounted in a housing ( 2 ) and which can be or is connected to the drive rod ( 10 ) via a gear, for example a lever gear, and with a locking mechanism accommodated in the housing ( 2 ) which can be switched by a locking cylinder or by a control cam ( 25 ) provided on this locking cylinder between a locking state in which the locking mechanism locks the gear and/or the drive rod ( 10 ) and a non-locking state, characterized in that the locking mechanism is formed by a single bolt ( 20 , 20a ) which interacts with the locking cylinder or its control cam ( 25 ), which has at least one locking lug ( 28 , 29 ) which, in the locking position, prevents the movement of the drive rod (10). 10 ) and/or the gear ( 5 , 7 ) and in the non-locking position releases the drive rod ( 10 ) and/or the lever gear ( 5 , 7 ). 4. Actuating gear according to claim 3, characterized in that the lever gear has an actuating lever ( 7 ) which is articulated with one end ( 7 ') directly to a further lever ( 5 ) connected to the nut ( 3 ) via a joint ( 6 ) radially offset with respect to the axis of rotation of the nut ( 3 ). 5. Actuating gear according to one of the preceding claims, characterized in that the axis of the joint ( 6 ) is arranged parallel to the axis of rotation of the nut ( 4 ), and that with respect to a plane running perpendicular to the first axial direction (L) and including the axis of rotation of the nut ( 3 ), in a first extreme position of the movement stroke of the actuating lever the joint ( 6 ) is arranged on one side of this plane and in another extreme position of the movement stroke of the actuating lever ( 7 ) on the other side of this plane. 6. Actuating gear according to one of the preceding claims, characterized in that the axis of the joint ( 6 ) in the extreme positions of the movement stroke of the actuating lever ( 7 ) is arranged in a common plane with the axis of rotation of the nut ( 3 ), and that this common plane is oriented parallel or approximately parallel to the first axial direction (L). 7. Actuating gear according to one of the preceding claims, characterized in that the actuating lever ( 7 ) forms a nose-like driver ( 7 ''') for engagement in the drive rod ( 10 ) at another end ( 7 ") remote from the joint (6). 8. Actuating gear according to one of the preceding claims, characterized in that the actuating lever ( 7 ) has an elongated design and lies with its longitudinal extension parallel or approximately parallel to the first axial direction (L). 9. Actuating gear according to one of the preceding claims, characterized in that the actuating lever ( 7 ) is supported with a rear side ( 7 "") facing away from the drive rod ( 10 ), which runs parallel or approximately parallel to the first axial direction (L), on at least one system ( 14 ) formed in the housing. 10. Actuating gear according to one of the preceding claims, characterized in that the actuating lever ( 7 ) is accommodated with at least a section extending in the first axial direction (L) in a part of the housing ( 2 ) which is arranged between a front side ( 1 ''') of the housing ( 1 , 1a ) facing the drive rod ( 10 ) and a plane running parallel thereto and enclosing the axis of rotation of the nut ( 3 ). 11. Actuating gear according to one of the preceding claims, characterized by stops ( 15 , 16 ) provided in the housing ( 2 ) for limiting the rotational movement of the nut ( 3 ). 12. Actuating gear according to one of the preceding claims, characterized in that the bolt ( 20 , 20a ) interacts directly with the locking cylinder or its control cam ( 25 ) via at least one control surface ( 26 ) formed on this bolt. 13. Actuating gear according to one of the preceding claims, characterized in that the at least one locking lug ( 28 ) in the locking state of the bolt ( 20 , 20a ) engages behind a blocking or locking surface of the drive rod ( 10 ), formed for example by a blocking opening ( 36 , 37 ). 14. Actuating gear according to one of the preceding claims, characterized in that the at least one locking lug ( 29 ) in the locked state of the bolt ( 20 , 20a ) extends into the movement space of the pivoting movement of the further lever ( 5 ) of the lever gear and thereby blocks the further lever ( 5 ) against pivoting from a first extreme position. 15. Actuating gear according to claim 14, characterized in that the at least one locking lug ( 29 ) forms a locking surface which cooperates with the further lever ( 5 ) in the locking state of the bolt ( 20 , 20a ) and rests with a side opposite this locking surface against a support or guide ( 32 ) formed in the housing ( 2 ), at least in the locking state. 16. Actuating gear according to one of the preceding claims, characterized in that the at least one locking lug ( 29 ) for locking the lever gear can be moved tangentially or approximately tangentially into the movement space of the further lever ( 5 ) or of a free end of this lever ( 5 ) with respect to an imaginary circular line around the axis of rotation of the nut ( 3 ). 17. Actuating gear according to one of the preceding claims, characterized in that the latch ( 20 , 20a ) is mounted in the housing ( 2 ) so as to be pivotable about a latch axis ( 22 ) for transfer from the non-locking state to the locking state and vice versa and at the same time also displaceable in a further axial direction radially to the latch axis. 18. Actuating gear according to claim 17, characterized in that the further axial direction is equal to or approximately equal to the axial direction in which the at least one locking lug ( 29 ) locking the lifting gear is moved from the non-locking state to the locking state. 19. Actuating gear according to one of the preceding claims, characterized by spring means ( 24 ) acting between the latch ( 20 , 20a ) and the housing ( 2 ) or an element ( 22 ) connected to the housing, against the action of which the latch ( 20 , 20a ) is moved at least in the further axial direction when transferred from the non-locking position to the locking position. 20. Actuating gear according to one of the preceding claims, characterized in that the latch ( 20 , 20a ) has a support surface, for example formed by a nose ( 27 ), with which the latch ( 20 , 20a ) in the locking state rests against a counter surface ( 33 ) formed on the housing ( 2 ), and that the spring means ( 24 ) are offset relative to the contact surface ( 27 ) in such a way that in the locking state they exert a torque on the latch ( 20 , 20a ) about an axis of rotation formed by the contact surface ( 27 ) which secures this state. 21. Actuating gear according to one of the preceding claims, characterized in that the bolt ( 20 , 20a ) is arranged with a bearing opening ( 23 ) on a bearing bush ( 22 ), and that the bearing opening ( 23 ) has a cross section which is larger than the cross section of the bearing bush in order to achieve the additional movement of the bolt ( 20 , 20a ) in the at least one further axial direction. 22. Actuating gear according to one of the preceding claims, characterized in that the spring means are provided in the region of the bearing opening ( 23 ) and act between the bearing bush ( 22 ) and a counter bearing for the spring means ( 24 ) provided at the bearing opening ( 23 ). 23. Actuating gear according to one of the preceding claims, characterized by guide means ( 34 , 35 ) on the housing ( 2 ) for guiding the latch ( 20 ). 24. Actuating gear according to one of the preceding claims, characterized in that the latch ( 20a ) has at least one preferably molded-on guide pin ( 39 ) which cooperates with a slotted guide ( 41 ) on the housing ( 2 ). 25. Actuating gear according to one of the preceding claims, characterized in that the housing ( 2 ) is designed to be mirror-symmetrical to a center plane (M) running perpendicular to the axis of rotation of the nut ( 3 ). 26. Actuating gear according to one of the preceding claims, characterized in that the housing ( 2 ) is received between legs ( 9 ') of a faceplate profile of the drive rod fitting ( 8 ) or a faceplate ( 9 ) of this fitting. 27. Actuating gear according to one of the preceding claims, characterized by projections ( 18 ) and by recesses ( 19 ) cooperating with these on the housing ( 2 ) or on the faceplate ( 9 ) for the precise positioning of the housing ( 2 ) relative to the faceplate. 28. Drive rod fitting with at least one drive rod ( 10 ) and with an actuating gear for the drive rod ( 10 ) according to one of the preceding claims.