EP0491133B1 - Actuating mechanism for window and door locks or similar - Google Patents

Abstract

An actuating mechanism 5 for window and door locks or the like is improved - with a mechanism housing 6 attachable to the end face of the wing or frame and fastenable thereto, - with an operating handle 7 mounted rotatably in the mechanism housing 6 and intended for a pinion 8, - with two toothed pieces 12 and 13 which are oppositely guided in the mechanism housing 6 so as to be longitudinally slidable and which mesh with the pinion 8 on diametrically opposite circumferential sides, and - with driving tabs 14 or 15 which project at the rear from each toothed piece 12 and 13 and which protrude through a slot in a baseplate connected releasably to the mechanism housing 6, - on the one hand the mechanism housing 6 being designed symmetrically in relation to a transverse plane 20-20 passing through the axis of rotation 19 of the operating handle 7, and - on the other the mechanism housing 6 being designed asymmetrically in the transverse direction in relation to a plane of movement 22-22 of the driving tabs 14 and 15 which is determined by the slot of the baseplate. <IMAGE>

Description

• mit einem auf die Stirnfläche des Flügels oder Rahmens aufsetzbaren und daran befestigbaren Gehäuse,
• mit einem im Gehäuse drehbar gelagerten Bedienungshandgriff für ein Ritzel, das über seinen gesamten Umfang - 360 - mit einer eine gerade Zähnezahl aufweisenden Verzahnung versehen ist,
• mit zwei im Gehäuse gegenläufig längsschiebbar geführten und an diametral gegenüberliegenden Umfangsseiten mit dem Ritzel kämmenden Zahnstücken und
• mit rückseitig von jedem Zahnstück abstehenden sowie durch einen Schlitz in einer lösbar mit dem Gehäuse verbundenen Bodenplatte herausragenden Mitnehmerlappen,
• wobei das Gehäuse einerseits zu einer durch die Drehachse des Bedienungshandgriffs gelegten Querebene - in Längsrichtung - symmetrisch gestaltet ist und
• wobei das Gehäuse andererseits bezüglich der vom Schlitz der Bodenplatte bestimmten Bewegungsebene der Mitnehmerlappen - in Querrichtung - unsymmetrisch ausgeführt ist,
• und jede innere Schiebestellung der Zahnstücke einer sich quer zur Längsrichtung des Gehäuses erstreckenden Stellung des Bedienungshandgriffs sowie jede äußere Schiebestellung der Zahnstücke einer sich parallel zur Längsrichtung des Gehäuses erstreckenden Stellung des Bedienungshandgriffs zugeordnet ist.

The invention relates to an actuating gear for window and door locks or the like.

• with a housing that can be placed on and attached to the end face of the wing or frame,
• with an operating handle for a pinion which is rotatably mounted in the housing and which is provided over its entire circumference - 360 - with teeth having an even number of teeth,
• with two oppositely longitudinally guided tooth pieces and meshing with the pinion on diametrically opposite circumferential sides and
• with driver tabs protruding from the back of each tooth piece and protruding through a slot in a base plate that is detachably connected to the housing,
• wherein the housing is on the one hand symmetrical to a transverse plane through the axis of rotation of the operating handle - in the longitudinal direction - and
• the housing, on the other hand, is asymmetrical with respect to the plane of movement of the driver tabs determined by the slot in the base plate, in the transverse direction,
• and each inner sliding position of the tooth pieces is assigned to a position of the operating handle extending transversely to the longitudinal direction of the housing, and each outer sliding position of the tooth pieces is assigned to a position of the operating handle extending parallel to the longitudinal direction of the housing.

Actuating gears of this type are already widely known and - mainly in connection with light metal and plastic windows and doors - in practical use. However, they all have the disadvantage that they are not the same for right and left hinges Functional parts can be assembled. Rather, at least two different groups of gear parts are required for this, which enable mirror-inverted installation in the housing which can be closed by the base plate.

A subsequent retrofitting of the known actuating gear, for example at the construction site, from right to left stop or vice versa is therefore not possible. Therefore, the known actuating gears of the generic type are necessarily manufactured from the outset in various versions for right and left stop and kept in stock.

DE-A 34 45 170 is already known to be known as a generic actuating gear, which uses gear members that enable subsequent conversion from right to left stop and vice versa. In this case, however, tooth pieces are required which are designed symmetrically parallel to their installation or movement plane, namely are provided with two toothings lying one above the other in the thickness direction in order to enable their installation in the housing in two 180 ° turning positions. In order to set these two 180 ° turning positions, it is also necessary to provide the driver tabs so that they are structurally separate or detachable from the tooth pieces, so that they can in turn be attached to them in two turning positions directed away from one another.

Subsequent retrofitting of these known actuating gears from right to left stop and vice versa is relatively complex because a larger number of functional parts each have to be detached from one another and formed again to form the correct toothed pieces. Functional parts that are detached from each other can easily be lost and endanger the practical usability of the actuating gear. Another disadvantage, however, is the relatively large overall height of the gear housing, which is caused by the toothing of the tooth pieces lying one above the other.

The invention aims to enable a subsequent retrofitting of the stop direction in the case of actuating gears of the type mentioned at the outset, without having to accept the disadvantages which are present in the non-generic, retrofittable actuating gears.

The object of the invention is therefore to enable a conversion of the stop direction for generic actuating gears using pairs of toothed pieces which can be coupled to the pinion and which are equipped with driving lugs fixed in a predetermined position, so that they can also be produced together with them in one piece or in the same material.

• daß die Verzahnungen der Zahnstücke zu einer durch ihre Mitnehmerlappen gelegten Querebene symmetrisch ausgebildet sind,
• daß die Gesamtlänge jeder Verzahnung mindestens ihrer doppelten Wirklänge entspricht,
• daß die Länge der gehäuseseitigen Führungen für die Zahnstücke wenigstens an das Doppelte der Baulänge ihrer Verzahnungen angepaßt ist,
• daß die innere Schiebestellung der Zahnstücke im Gehäuse an der durch die Drehachse des Bedienungshandgriffs gelegten Querebene durch die Mitnehmerlappen oder diesen benachbarte Anschläge begrenzt ist,
• daß die äußere Schiebestellung der Zahnstücke durch die Enden der gehäuseseitigen Führungen und die ihnen zugewandten Enden der Zahnstücke begrenzt ist,
• und daß die Zahnstücke mit ihren Mitnehmerlappen wahlweise in zwei relativ zur Querebene des Gehäuses gegeneinander längsversetzten Lagen ohne Verdrehung in das Gehäuse einsetzbar sowie dabei über ihre Verzahnungen mit der Ritzelverzahnung kuppelbar sind.

A control gear of the generic type designed or improved in this way is distinguished according to the invention in that

• that the toothings of the tooth pieces are symmetrical to a transverse plane through their driver lobes,
• that the total length of each toothing corresponds to at least twice the effective length,
• that the length of the housing-side guides for the tooth pieces is adapted to at least twice the overall length of their teeth,
• that the inner sliding position of the tooth pieces in the housing on the transverse plane defined by the axis of rotation of the operating handle is limited by the driver tabs or stops adjacent to them,
• that the outer sliding position of the tooth pieces is limited by the ends of the housing-side guides and the ends of the tooth pieces facing them,
• and that the toothed pieces with their driver tabs can optionally be inserted in two positions that are longitudinally offset relative to the transverse plane of the housing without rotation into the housing and can be coupled to the pinion toothing via their toothings.

The advantage of this embodiment of an actuating gear according to the invention is that after removing the detachable base plate from the housing, a change of the stop direction is possible simply by the fact that both toothed pieces can be lifted out of the guides of the housing and from the relevant engagement position with the pinion with their driver tabs then are displaced longitudinally relative to each other so far that their driver tabs assume an exactly interchanged sliding position when the toothings of the tooth pieces are then brought back into engagement with the pinion toothing remaining in the position given during disassembly. In addition to removing and replacing the base plate, all that is required for converting the stop direction of an actuating gear according to the invention is the opposite movement of the tooth pieces in the longitudinal guides on the housing side.

It has proven itself in an actuating gear according to the invention if the toothings of the tooth pieces each have an odd number of tooth gaps or teeth over their entire length, this number preferably over the - even number - number of teeth or tooth gaps on the circumference of the pinion by n = 1 is reduced and the mean tooth gap or the middle tooth lies on the transverse plane of symmetry of the tooth piece.

According to the invention, it also proves to be advantageous if the tooth pieces have an approximately Z-shaped cross-section in their length region having the driving lobes, while they are provided with an approximately L-shaped cross-section over a partial length adjoining on both sides and have a flat cross-section towards their ends, this flat cross-section being provided with a position offset parallel to the driving tab. With the mutually facing ends of the L-legs lying on the same level within the housing, in particular adjacent to the base plate, the tooth pieces can move past one another unhindered when they are shifted when their driving lobes shift towards the inner sliding position.

Fig. 1

in schematisch vereinfachter Ansichtsdarstellung ein Drehflügelfenster mit Betätigungsgetriebe für den Verschluß bei Rechtsanschlag

Fig. 2

eine der Fig. 1 entsprechende Darstellung eines Fensters, jedoch bei Linksanschlag,

Fig. 3

in größerem Maßstab einen Schnitt entlang der Linie III - III in Fig. 1,

Fig. 4

ebenfalls in größerem Maßstab einen Schnitt entlang der Linie IV - IV in Fig. 2,

Fig. 5

eine Ansicht in Pfeilrichtung V der Fig. 3 auf das Betätigungsgetriebe bei vom Gehäuse abgenommener Bodenplatte in der Verschluß-Schaltstellung,

Fig. 6

eine Ansicht in Pfeilrichtung VI der Fig. 4 auf das Betätigungsgetriebe bei vom Gehäuse abgenommener Bodenplatte in der Verschluß-Schaltstellung,

Fig. 7

eine der Fig. 5 entsprechende Ansicht des Betätigungsgetriebes, jedoch in der Entriegelungs-Schaltstellung ,

Fig. 8

eine der Fig. 6 entsprechende Darstellung des Betätigungsgetriebes, jedoch in der Entriegelungs-Schaltstellung, die

Fig. 9 bis 11

in Rückansicht, Seitenansicht und Stirnansicht das eine - schmale - Zahnstück für das Betätigungsgetriebe nach den Fig. 3 bis 8, die

Fig. 12 bis 14

in Rückansicht, Seitenansicht und Stirnansicht das andere - breite - Zahnstück des Betätigungsgetriebes nach den Fig. 3 bis 8

Fig. 15

in einer den Fig. 9 und 12 entsprechenden Rückansicht die gegenseitige Zuordnung der beiden Zahnstücke wie sie im Betätigungsgetriebe nach Fig. 7 vorgesehen ist, und

Fig. 16

in einer den Fig. 9 und 12 entsprechenden Rückansicht die gegenseitige Zuordnung der beiden Zahnstücke, wie sie im Betätigungsgetriebe nach Fig. 8 vorgesehen ist.

The subject matter of the invention is explained below using exemplary embodiments with reference to the drawing. It shows or show:

Fig. 1

in a schematically simplified view representation, a casement window with actuating gear for the lock at the right stop

Fig. 2

1 a representation of a window corresponding to FIG. 1, but with a left stop,

Fig. 3

on a larger scale a section along the line III - III in Fig. 1,

Fig. 4

also on a larger scale a section along the line IV - IV in Fig. 2,

Fig. 5

3 is a view in the direction of arrow V of FIG. 3 on the actuating gear with the base plate removed from the housing in the closed switch position,

Fig. 6

4 is a view in the direction of arrow VI in FIG. 4 on the actuating gear with the base plate removed from the housing in the closed switch position,

Fig. 7

5 corresponding view of the actuating gear, but in the unlocked switch position,

Fig. 8

6 corresponding representation of the actuating gear, but in the unlocking switch position, the

9 to 11

in rear view, side view and front view the one - narrow - tooth piece for the actuating gear according to FIGS. 3 to 8, the

12 to 14

in rear view, side view and end view the other - wide - tooth piece of the actuating gear according to FIGS. 3 to 8

Fig. 15

in a rear view corresponding to FIGS. 9 and 12, the mutual assignment of the two tooth pieces as provided in the actuating gear according to FIG. 7, and

Fig. 16

in a rear view corresponding to FIGS. 9 and 12, the mutual assignment of the two tooth pieces, as provided in the actuating gear according to FIG. 8.

1 and 2 of the drawing, a window consisting of a fixed frame 1 and a sash 2 can be seen, in which the sash 2 is movably suspended on the fixed frame 1 by hinges 3 as a so-called rotating sash.

The closed position of the wing 2 on the fixed frame 1 is fixed by a locking device which is known per se - and therefore not shown in detail - which can be engaged and disengaged via an actuating gear 5 leaves. The actuating gear 5 adjusts two locking bars (not shown), which are guided on the wing 2 so as to be longitudinally displaceable, with movement in opposite directions.

Of the actuating gear 5, only the gear housing 6 and an operating handle 7 rotatably mounted therein can be seen in FIGS. 1 and 2, which are fastened seated on the end face of the wing 2.

When the actuating gear 5 is in the locked switch position, the operating handle 7 is provided relative to the gear housing 6 with a downward rotational position, as is indicated in full lines. In contrast, it is in the unlocking switch position in an approximately horizontally oriented rotational position, as indicated by the dashed lines in FIGS. 1 and 2.

3 to 8 of the drawing it can be seen that the actuating gear 5 within the gear housing 6 has a rotatably mounted pinion 8, which according to FIGS. 3 and 4 via a bearing shaft 9 with the - not shown - operating handle 7 in constant Drive connection is established.

The pinion 8 is provided over its entire circumference, ie over the full angle of 360 °, with an even number of teeth 9, for example eight teeth 9, and also has a corresponding even number of tooth gaps. It meshes on diametrically opposite circumferential sides, each with a toothing 10 or 11 of two tooth pieces 12 and 13 which are guided in the gear housing 6 in opposite directions and can be pushed longitudinally.

On the back of the tooth piece 12 is a driver tab 14 and from the tooth piece 13 a driver tab 15, these driver tabs 14 and 15 protrude through a longitudinal slot 16 of a base plate 17, which closes the rear of the gear housing 6 according to FIGS. 3 and 4. The base plate 17 can be detached from the housing 6, for example by self-clamping in the blind holes 18 of the gear housing 6 engaging pins or by screws, held in connection.

On the one hand in FIGS. 5 and 7 and on the other hand in FIGS. 6 and 8 it can be seen that the gear housing 6 is designed symmetrically with respect to a transverse plane 20-20 - that is to say the length - through the axis of rotation 19 of the pinion 8. It can also be seen from FIGS. 3 to 8 of the drawing that the axis of rotation 19 of the pinion 8 lies on a longitudinal central plane 21-21 through the gear housing 6. However, with respect to a movement plane 22-22 of the two driving lobes 14 and 15 of the toothed pieces 12 and 13 which is parallel to the longitudinal center plane 21-21 and is determined by the slot 16 of the base plate 17, the gear housing 6 is designed asymmetrically. The same applies to the gear housing 6 also with respect to the longitudinal plane 23-23, on which fastening interventions 24, e.g. Threads lie, via which the actuating gear 5 can be anchored to the wing 2, for example by means of screws.

Due to the transverse offset x between the plane of movement 22-22 for the driver tabs 14 and 15 to the longitudinal center plane 21-21 of the gear housing 6, and also due to the transverse offset y of the plane 23-23 of the fastening interventions 24 relative to the longitudinal center plane 21-21, the actuating gear can 5 with an angle of rotation limited to 90 ° for the operating handle 7 cannot be used unchanged for the right-hand stop according to FIG. 1 and the left-hand stop according to FIG. 2 of the drawing. Rather, two actuating gears 5 which differ from one another in terms of their assembly must be available for this purpose.

The design measures shown in FIGS. 3 to 16 of the drawing make it possible, using only a single set of components, with minimal assembly or conversion work, depending on requirements, to create actuating gears 5 suitable for right-handed or left-handed hinging, or subsequently. to convert the respective actuating gear.

To achieve this goal, the teeth 10 of the toothed piece 12 are first arranged or formed symmetrically to a transverse plane 25-25 through its driver tab 14 and the teeth 11 of the toothed piece 13 to a transverse plane 26-26 through its driver tab 15, such as that Fig. 9 and 10 and 12 and 13 clearly. In addition, the total length 27 of the toothing 10 of the tooth piece 12 and the total length 28 of the toothing 11 of the tooth piece 13 is designed so that it corresponds to at least twice the effective length over which they are after the assembly of the actuating gear 5 with the teeth 9 on the circumference of the pinion 8 can comb.

It can be seen from FIGS. 5 to 8 that with a rotation angle of the pinion 8 of 90 ° only three teeth 9 of the same can come into drive engagement one after the other with the toothing 10 or 11 of the tooth pieces 12 or 13. The teeth 10 and 11 of the tooth pieces 12 and 13 are designed in the embodiment shown so that they each have seven tooth gaps, of which in turn the middle lies on the transverse plane 25-25 or 26-26 of the respective tooth piece 12 or 13.

A shortened design of the tooth pieces 12 and 13 - which is not shown in the drawing - can be realized in that their toothings 10 and 11 each receive only six tooth gaps or seven teeth, the middle tooth of which then on the transverse plane 25-25 or 26-26 comes to rest. In this case, the basic position of the pinion 8 is then twisted by half a tooth pitch to be coupled with the operating handle 7.

Another design condition for the actuating gear 5 is also that the length of the housing-side guides 29a and 29b for the tooth piece 12, as well as the length of the housing-side guides 30a and 30b for the tooth piece 13 are each dimensioned such that they are approximately twice their size actual length 27 or 28 corresponds. This fact is particularly clear from FIGS. 5 and 6 of the drawing can be seen because there are the two tooth pieces 12 and 13 meshing with the pinion 8 via their toothings 10 and 11 in their outer sliding position. This outer sliding position of the tooth pieces 12 and 13 can be limited in the gear housing 6 either in the switching position shown in FIG. 5 by the ends of the housing-side guides 29a and 30b or in the position shown in FIG. 6 by the ends of the housing-side guides 29b and 30a , in each of which the operating handle 7 assumes a downward rotational position relative to the gear housing 6 relative to the gear housing 6.

In contrast, the inner sliding position of the tooth pieces 12 and 13 according to FIGS. 7 and 8 of the drawing can be limited by the fact that their driver tabs 14 and 15 or adjacent stops meet on the transverse plane 20-20 defined by the axis of rotation 19 of the operating handle 7. This is always the case when the operating handle 7 assumes a horizontal rotational position.

The difference in the actuating gear 5 according to FIGS. 3, 5 and 7 compared to the actuating gear according to FIGS. 4, 6 and 8 is only the relative installation position of the two toothed pieces 12 and 13 to the pinion 8 or to the transverse plane laid by the axis of rotation 19 thereof 20-20. 5 and 7, the toothed pieces 12 and 13 are installed in the gear housing 6 in such a way that the driving tab 14 lies in that half of the housing next to the transverse plane 20-20 which contains the guides 29a and 30a and the driving tab 15 in that Half of the housing is arranged next to the transverse plane 20-20, in which the guides 29b and 30b are located, this is reversed in the installation position according to FIGS. 6 and 8. There is namely the driver tab 14 of the tooth piece 12 in that housing half next to the transverse plane 20-20, which contains the guides 29b and 30b, while the driver tab 15 of the tooth piece 13 is located in the housing half next to the transverse plane 20-20, which is with the guides 29a and 30a is equipped. FIG. 15 only shows the tooth pieces 12 and 13 in the mutual assignment corresponding to FIG. 7, while FIG. 16 corresponds to FIG. 8 in this regard.

In order to enable a change in the stop direction for the actuating gear 5, as can be seen in FIGS. 1 and 2, after removing the base plate 17 from the gear housing 6, it is only necessary to select the two toothed pieces 12 and 13 with their driver tabs 14 and 15 alternatively in two longitudinally staggered positions relative to the transverse plane 20-20 of the transmission housing 6 interchangeable positions and thereby couple with their teeth 10 and 11 with the teeth 9 of the pinion 8 before the base plate 17 is then replaced and fastened.

Although it is readily possible to translate the tooth pieces 12 and 13 in opposite directions relative to the gear housing 6 in their longitudinal direction when they are in their outer sliding position (FIG. 5 or 6), it proves to be particularly advantageous and simple to perform this transfer operation carry out when the inner sliding position of the tooth pieces 12 and 13 (Fig. 7 and 8) is set. Here, namely, the exact mutual installation position for the tooth pieces 12 and 13 can easily be determined by the directly adjacent relative position of the driver tabs 14 and 15.

From FIGS. 9 to 11 and 12 to 14 of the drawing it can also be deduced that the two tooth pieces 12 and 13 each have an approximately Z-shaped cross-section in their length region a having the driving tabs 14 and 15, respectively. On the other hand, an approximately L-shaped cross section results on the toothed pieces 12 and 13 over a partial length b adjoining the driving lugs 14 and 15, while the end regions c of these toothed pieces 12 and 13 facing away from one another only have a flat cross section, which with a to the driver tab 14 or 15 parallel offset position is provided. Structurally, the two tooth pieces 12 and 13 differ from one another in that they have different widths or different distances d and e of their driver tabs 14 and 15 from the toothings 10 and 11, respectively.

Although this is not shown in the drawing, it should also be mentioned that spring locking elements can be provided between the operating handle 7 and the gear housing 6 in a known manner, which have a locking angle spacing of 90 ° relative to one another. These have the purpose of fixing the operating handle 7 relative to the gear housing 6 each after an angular rotation of 90 ° with a predetermined holding force, i.e. eliminating undesired inclinations of the operating handle 7 relative to the gear housing 6 and / or relieving the stop positions for the tooth pieces 12 and 13 .

Claims (5)

1. An actuating mechanism (5) for window and door locks or the like,

   - with a housing (6) which can be fitted on to and secured on the end face of the casement (2) or frame (1),

   - with an actuating handle (7) mounted rotatably in the housing (6), for a pinion (8) which has a toothing (9) extending over its entire periphery - 360°, said toothing comprising an even number of teeth,

   - having two toothed members (12, 13) guided for contra-directional longitudinal sliding in the housing (6) and meshing with the pinion (8) on diametrically opposite peripheral sides, and

   - having driver lugs (14, 15) which project rearwardly from each toothed member (12 and 13) and which project through a slot (16) in a baseplate (17) releasably connected to the housing (6),

   - the housing (6) being on the one hand symmetrical - in the longitudinal direction - with respect to a transverse plane (20 - 20) passing through the rotational axis (19) of the actuating handle (7) and

   - the housing (6) being on the other hand unsymmetrical - in the transverse direction - with respect to the plane of movement (22 - 22) of the driver lug (14, 15) defined by the slot (16) in the baseplate (17),

   - and each inner sliding position of the toothed members (12, 13) having an associated position of the operating handle (7) extending transversely of the longitudinal direction of the housing (6), and each outer sliding position of the toothed members (12, 13) having an associated position of the operating handle (7) extending parallel to the longitudinal direction of the housing (6),

   characterised in that

   - the toothings (10 and 11) of the toothed members (12 and 13) are symmetrical with respect to a transverse plane (25 - 25 and 26 - 26) passing through their driver lugs (14 and 15),

   - in that the total length (27 and 28) of each toothing (12 and 13) is equivalent to at least twice its operative length,

   - in that the length of the guides (29a, 29b and 30a, 30b) adjacent the housing for the toothed members (12 and 13) is adapted to at least twice the overall length (27 and 26) of their toothing (12 and 13),

   - in that the inner sliding position of the toothed members (12 and 13) in the housing (6) is limited at the transverse plane (20 - 20) passing through the rotational axis (19) of the actuating handle (7), by the driver lugs (14 and 15) or stops adjacent the same,

   - in that the outer sliding position of the toothed members (12 and 13) is limited by the ends of the guides (29a, 29b and 30a, 30b) adjacent the housing and the ends of the toothed members (12 and 13) facing them and

   - in that the toothed members (12 and 13) can without turning be inserted by their driver lugs (14 and 15) in the housing (6) optionally in two positions longitudinally offset from one another relatively to the transverse plane (20 - 20) of the housing (6) and are at the same time adapted to be coupled to the pinion toothing (9) via their toothings (10 and 11).
2. An actuating mechanism according to claim 1, characterised in that the toothings (10 and 11) of the toothed members (12 and 13) each have an uneven number of tooth gaps or teeth over their entire length.
3. An actuating mechanism according to claim 1 or 2, characterised in that the number of tooth gaps or teeth in the toothings (10 and 11) of the toothed members (12 and 13) is reduced by n = 1 compared with the number of teeth (9) or tooth gaps at the periphery of the pinion (8) and in that the middle tooth gap or middle tooth lies on the transverse plane (25 - 25; 26 - 26) of the toothed member (12; 13).
4. An actuating mechanism according to any one of claims 1 to 3, characterized in that the toothed members (12 and 13) have a substantially Z-shaped cross-section in their longitudinal zone (a) provided with the driver lugs (14 and 15), have a substantially L-shaped cross-section over a partial length (b) adjoining each side, and have a flat cross-section towards their ends (c), the flat cross-section being provided with a position (d; e) offset parallel to the driver lugs (14 and 15).
5. An actuating mechanism according to any one of claims 1 to 4, characterized in that spring catch elements are provided between the operating handle (7) and the housing (6) and have detent angle distances of 90° relatively to one another.

Images