EP0364698B1 - Locking device for windows, doors or the like - Google Patents

Abstract

An automatically acting locking device 21 is proposed for windows and doors or the like, the wing 2 of which is connected in an articulated manner to the casement 1 via drop-arm mechanisms which act as knock-out systems 4 and which are arranged in a completely concealed manner between the rebates 2a and 1a of wing 2 and casement 1. For the perfect sealing of the wing 2, which in the closed position bears on the casement 1, there is a locking slide 22 which is guided, for example, on the wing 2, movably in parallel with the plane of the latter and which projects at least temporarily with a setting extension 24 into the path of movement of a control cam 25 located on the control arm 18. When the wing 2 approaches the casement 1 during the closing movement, the locking slide 22 can be pressed via its setting extension 24 and the control cam 25 with a tightening slope 27 behind a locking extension 23 which is located on the casement side and which is arranged at least in the vicinity of the pivot-bearing suspension 6 for hanging the drop-arm mechanism or knock-out system 4 on the casement side. <IMAGE>

Description

The invention relates to a locking device for windows and doors or the like. The wing of which is articulated to the frame via steering lever gearboxes, which are concealed between the rebates of the wing and frame.

Locking devices of this type are already known and are provided in operative connection with differently constructed steering lever gears.

According to EP-A-0281062, steering lever gears are used which consist of a suspension arm pivotally suspended on the frame, a main link connected to the wing, and two connecting links which only pivotally engage the suspension arm and the main link, one of the connecting arms being connected to the frame by a control arm is held in place in order to control a forced relative displacement of the main link relative to the supporting link by means of the connecting link during the opening and closing movement of the wing.

In this case, the locking device consists, on the one hand, of a locking engagement arranged on the bearing-side end of the supporting link and, on the other hand, of a locking nose arranged on the rear end of the main link.

The engaging and disengaging movement of this locking device is controlled solely by the two connecting links, which are arranged between the supporting link and the main link, to a certain extent forming a link parallelogram.

According to US-A-2926399, steering arm transmissions which are effective as display systems also belong to the prior art, which consist of a mounting rail to be fastened in the frame on the frame side and a holding rail which also acts on the wing side, also in the fold, and two steering levers of different lengths, these steering levers are connected to the bearing rail and the holding rail via a swivel joint, and form a steering trapezoid with the latter, the shortest link of which is the wing-side holding rail.

In this case, the locking devices are assigned to the display systems in the area of the corner zones of the sash and frame, in such a way that an approximately wedge-shaped locking lug sits fixed on the sash, while a likewise wedge-shaped locking engagement is also connected to the frame in a stationary manner.

In this case too, the engagement and disengagement movement of the locking device is controlled solely by the two connecting links, which are arranged to form a trapezoidal link between the wing-side holding rail and the frame-side bearing rail.

In both known locking devices, it has been found to be disadvantageous that a play-free operative connection between the locking engagement and the locking lug is not permanently and reliably achievable when the wing is in the closed position because the bearing clearance is increasing can increase the various articulation points in practical use under load after a short time and then the operation of the locking device is so impaired that the sealing contact pressure of the wing on the frame is lost.

The invention has for its object to provide a locking device of the generic type, which is controlled depending on the respective steering lever gear, but can keep the wing reliably in its closed position on the frame under sufficiently large sealing pressure, regardless of that Bearing play or the loose in the various joints of the display systems or steering lever gear.

On the basis of steering lever gearboxes, which consist of a suspension arm that is only pivotally pivotable on the frame, a main link connected to the wing and two connecting links that also only pivotally engage the suspension arm and the main link, and where one of the connecting links is controlled by a control arm, e.g. via a slot guide , with the frame held in place, the object on which the invention is based is basically achieved by
that a locking slide which is movably guided parallel to the plane thereof is arranged on the wing and, at least temporarily, projects into the path of movement of a control cam seated on the control arm with an adjusting projection,
and that the locking slide can be pressed over the actuating projection and the control cam when the wing is approaching closing movement to the frame with a bevel behind a frame-side locking projection which sits at least in the vicinity of the pivot bearing suspension for the supporting link.

On the basis of steering lever gearboxes, which consist of a bearing rail to be fastened in the frame on the frame side and a holding rail that also acts on the wing side, also in the fold, as well as two steering levers of different lengths, which each have a swivel joint with the bearing rail and the support rail are connected and form a steering trapezoid, the shortest link of which is the wing-side support rail, however, the object can be achieved according to the invention in that a locking slide which is movably guided parallel to its plane is arranged on the wing and at least temporarily with an actuating approach protrudes into the path of movement of a control cam located on the longer steering lever, and that the locking slide can be pressed via the actuating shoulder and the control cam when the wing approaches closing movement to the frame with a bevel behind a frame-side locking shoulder which is at least in the vicinity of the wing-side linkage of the shorter steering lever sits on the frame.

According to another solution principle, it is also possible according to the invention
that a locking slide which is movably guided parallel to its plane is arranged on the frame and at least temporarily protrudes into the path of movement of a control cam seated on the longer steering lever with an adjusting projection,
and that the locking slide can be pressed over the actuating projection and the control cam when the wing is approaching the closing movement to the frame with a bevel behind a wing-side locking projection which sits at least in the vicinity of the swivel joint on the wing for the shorter steering lever.

According to all the solution principles according to the invention, the locking device is engaged and disengaged by means of the displacement movement of the sash relative to the frame, which is controlled by the steering lever mechanism. However, the time and extent of the bolt engagement are only indirectly dependent on the respective movement characteristics of the steering lever gears used as opening systems. Since the control cam located on the control arm or on the longer steering lever can already be in operative connection with the actuating projection of the locking slide when the sash is still a certain distance from the frame, the actuating movement can be carried out Initiate for the bolt slide at an early stage and thus bring about the effect of its tightening bevel on the bolt attachment on the frame or sash at an early stage.

In the end position of the steering lever gears used as the opening systems, which corresponds to the closed position of the sash, these can be clamped firmly with the locking device by overcoming the bearing play between sash and frame in the bearing points, whereby a good sealing system of the sash on the frame can be achieved.

According to the invention it is provided in a further embodiment that the control cam on the control arm or on the longer steering lever is provided with a pressure curve and an at least regionally equidistant push-off curve between which the actuating projection of the locking slide engages at least when the sash is in the closed position on the frame.

Not only in the closing movement but also in the opening movement of the leaf, in this case the control arm or the longer steering lever exerts an actuating force on the actuating shoulder of the locking slide, so that automatic positive control is achieved both for locking and unlocking.

However, it has proven to be particularly advantageous if the locking slide is constantly held in the direction of its unlocked position under pre-tension. During the opening movement of the wing, the push-off curve of the control cam then only needs to exert a brief movement impulse on the actuating projection of the locking slide, whereupon the spring force then moves it further in the unlocking direction and holds it in the unlocking position.

So that inaccuracies can be compensated for, which occur when installing the steering lever gear between sash and frame, it has also proven to be useful if the control cam on the control arm or on the longer steering lever and / or the adjustment on the locking slide are arranged readjustable.

In the simplest case, eccentrics can be used as adjusting members, which can be rotated relatively stiffly, either on the control arm or on the longer steering lever or on the locking slide.

A structurally particularly simple, but optimal in its effect locking device according to the solution principle of claim 1 can be created in that the frame-side locking approach is formed by a bearing sleeve seated on the frame pivot bearing sleeve of the suspension arm.

In this case, with the help of the locking device, the bearing play between the bearing journal and the bearing sleeve can also be overcome, thereby further improving the sealing system of the closed wing on the frame.

From a constructional point of view, it has proven particularly useful if, according to the invention, the locking slide is guided on or in a rail-shaped fitting part which can be accommodated in a profile groove on the rebate surface of the wing, and which either forms the main link or the holding rail of the steering lever gearbox, or else is the mounting base for a main link serving as a tilt and turn arm.

For a locking device according to the solution principle of claim 3, it is recommended if, according to the invention, the locking slide is guided on the frame side to be fastened in the rebate and can be brought into and out of locking engagement with the wing-side bearing journal for the shorter steering lever via its tightening slope.

At the points removed from the display systems or steering lever gears, the locking of the sash in the closed position on the frame is activated brought about with the aid of a conventional espagnolette lock which, for example, actuates locking pins which can be displaced on the sash and which cooperate with strikers or strikers on the frame.

Bolt devices with the training features according to the invention can not only be used for windows and doors or the like, the leaves of which can be moved relative to the frame in the manner of rotating leaves, tilting leaves or folding leaves.

Rather, they can be used particularly advantageously if the sash is held relative to the frame in the manner of a tilt-and-turn sash, optionally displaceable around a lower, horizontal edge or else around a lateral, upright edge.

In the latter case, a locking device according to the invention is assigned at least to the opening system or steering lever mechanism which is effective as a tilt and turn corner bearing between the sash and the frame.

Fig. 1

in der Draufsicht ein als Ausstellsystem für den Flügel von Fenstern und Türen od. dgl. dienendes Parallelogramm-Lenkhebelgetriebe mit zugehöriger Riegelvorrichtung in einer einem geringen Öffnungswinkel des Flügels entsprechenden Funktionsstellung,

Fig. 2

das Parallelogramm-Lenkhebelgetriebe mit Riegelvorrichtung nach Fig. 1 bei einem größeren Öffnungswinkel des Flügels,

Fig. 3

einen Vertikalschnitt durch das Parallelogramm-Lenkhebelgetriebe und die Riegelvorrichtung nach den Fig. 1 und 2, welches als Drehkipp-Ecklager ausgeführt ist,

Fig. 4

in der Draufsicht ein Trapezlenker-Lenkhebelgetriebe mit zugehöriger Riegelvorrichtung bei einer der Fig. 2 entsprechenden Öffnungswinkelstellung des Flügels relativ zum Blendrahmen und

Fig. 5

wiederum in der Draufsicht ein Trapezlenker-Lenkhebelgetriebe mit Riegelvorrichtung mit einer gegenüber Fig. 4 abgewandelten Bauart.

Various exemplary embodiments of a locking device according to the invention are shown in the drawing. Here shows

Fig. 1

in plan view a parallelogram steering lever mechanism serving as an opening system for the sash of windows and doors or the like, with associated locking device in a functional position corresponding to a small opening angle of the sash,

Fig. 2

1 with a larger opening angle of the sash,

Fig. 3

a vertical section through the parallelogram steering lever gear and the locking device according to FIGS. 1 and 2, which is designed as a tilt and turn corner bearing,

Fig. 4

in the plan view a trapezoidal link steering lever gear with associated locking device in an opening angle position of the wing corresponding to FIG. 2 relative to the frame and

Fig. 5

again in plan view a trapezoidal link steering lever gear with locking device with a modified compared to FIG. 4 type.

1 to 3 of the drawing, the frame 1 and the sash 2 of a window, a door or the like is shown, schematically simplified. In this case, the legs of the frame 1 each have transverse circumferential surfaces 1a directed transversely to the main plane thereof, while the wing 2 also has circumferential fold surfaces 2a directed transversely to its main plane.

Frame 1 and sash 2 are designed so that when the sash 2 is in the closed position on the frame, there is a distance 3 - the so-called rebate clearance - between its peripheral peripheral surfaces 1a and 2a. This distance 3 is for example 11 to 12 mm.

The wing 2 of the window or door is also provided with a rollover 2b, which has such a shape that it comes to rest with its rear surface on the room-side end face 1b of the frame 1 when the wing 2 is relative to the frame 1 Occupies the closed position.

In this case, the distance 3 - or the rebate clearance - between the rebate circumferential surfaces 1a and 2a of the frame 1 and wing 2 is completely bridged by the wing overlap 2b.

On the outside, the legs of the frame 1 are equipped with a profile shoulder 1c, which in its cross-sectional shape resembles the wing flap 2b. It serves the purpose of the distance 3 - or the air gap - between to bridge the fold peripheral surfaces 1a and 2a of the frame 1 and sash 2 on the outside as soon as the sash 2 assumes its closed position on the frame 1.

So that the wing 2 relative to the frame 1 assumes a very specific functional position both in its closed position and in each open position, special display systems 4 are used, which are completely hidden between the rebate peripheral surfaces 1a and 2a of frame 1 and wing 2, as is clear can be seen in Fig. 3 of the drawing.

Two opening systems 4 are assigned to each window or door, although only one such opening system can be seen in FIG. 3 of the drawing.

The two display systems 4 are installed in two mutually parallel clearance or rebate air areas 3 between the frame 1 and the sash 2 in such a way as can be seen in FIG. 3 of the drawing.

The movement plane of the exhibition system 4 extends perpendicular to the plane of the drawing according to FIG. 3 and parallel to the plane of the drawing according to FIGS. 1 and 2.

If the opening movement of the sash 2 relative to the frame 1 is to take place at vertical articulation points, the raising systems 4 are installed between the lower and the upper horizontally located peripheral circumferential surfaces 1a and 2a of the frame 1 and sash 2, as shown in FIG. 3.

However, if the opening movement of the wing 2 relative to the frame 1 is to take place around horizontal articulation points, then the opening systems 4 are to be installed in each case between the upright fold peripheral surfaces 1a and 2a of frame 1 and wing 2.

In Fig. 3 of the drawing, an opening system 4 is shown, which can be used as a tilt and turn corner joint, that is, a design that not only allows the wing to be rotated about vertical articulation points 8, but also the wing 2 for tilt opening in the area supports his lower, horizontal leg.

The opening system 4 shown in FIGS. 1 to 3 is designed as a steering lever transmission which has a supporting link 5 which, for example via a ball joint 6, rests at its rear end on a fastening rail 7 which bears against the fold peripheral surface 1a of the frame 1, is rigidly attached.

With the help of the ball joint 6, the supporting link 5 can on the one hand perform a movement about a vertical joint axis 8, specifically over an angular range of approximately 90 °. On the other hand, it can also be angularly displaced to a limited extent about a horizontal hinge axis 9, for example over an angular range of at most 15 °.

In addition to the supporting link 5 which is articulated to the frame 1 via the ball joint 6 and the screw-on plate 7, the opening system 4 also has a main link 10 which sits on the circumferential fold surface 2a of the wing 2 and is preferably inserted there in a stepped profile groove 11.

While the screw plate 7 for mounting the support arm 5 on the frame 1 extends parallel to the main plane, the main link 10 is inserted into the stepped profile groove 11 of the wing 2 so that it runs parallel to the main plane of the wing 2.

The support arm 5 is coupled to the main link 10 by two connecting links 12 and 13. In this case, the connecting link 12 is arranged on the supporting link 5 via an articulation pin 14 only in a pivotable manner, while it engages on the main link 10 via a link pin 15, also exclusively in a pivotable manner.

The connecting link 13 is also held exclusively on the supporting link 5 by a pivot pin 16, while it acts on the main link 10 with a link pin 17, also only pivotable. Both connecting links 12 and 13 have between their hinge pins 14 and 15 or 16 and 17 of the same length and are arranged so that they form a parallelogram steering lever transmission with the supporting link 5 and the main link 10.

A control arm 18, which rigidly engages one of the two connecting links 12 or 13, preferably on the connecting link 13, and on the other hand is movable in a slot guide 20 via a sliding pin 19, serves for the compulsory movement control of each opening system 4 or the parallelogram steering lever transmission forming it. which extends parallel to the main plane of the frame 1 and is arranged in an extension of the screw plate 7.

During the opening and closing movement of the wing 2 about the vertical hinge axis 8, a control of the respective display system 4 is brought about with the aid of the control arm 18, in such a way that the wing overturning at no time via an opening angle of the wing 2 of at least 90 ° 2b can collide with the room-side end face 1b of the frame 1. Only when the wing 2 comes into contact with the frame 1 in the closed position does the wing flap 2b rest with its rear surface against the end face 1b of the frame 1 on the room side.

Since, with the aid of the opening systems 4 or the parallelogram steering lever gears forming them, in the closed position of the wing 2, in particular in the region of the vertical articulated axis 8, it is not possible to produce sufficient sealing contact pressure in the direction against the frame 1, the opening systems 4 or a special locking device 21 is assigned to the steering lever gears forming these. This locking device 21 consists according to FIGS. 1 to 3 of a movable on the wing 2 parallel to its plane guided locking slide 22 and a locking lug 23 fixed to the frame 1.

The locking slide 22 carries an adjusting lug 24 which, at least temporarily, protrudes into the movement path of a control cam 25, which sits on the control arm 18 of the opening system 4 or the parallelogram steering lever mechanism, as can be clearly seen in FIGS. 1 to 3 .

The actuating lug 24 on the locking slide 22 and the control cam 25 on the control arm 18 are arranged relative to one another such that when the leaf 2 approaches the closing movement of the frame 1 the actuating lug 24 already hits the control cam 25 before the leaf 2 assumes its closed position .

Via the, for example, an inclined surface, pressure curve 26 of the control cam 25, the actuating projection 24 is then displaced in the course of the further closing movement of the wing 2 and, via this, the locking slide 22 in the direction of the locking projection 23.

With a tightening bevel 27, the locking slide 22 meets the locking projection 23 and thereby causes the wing 2 with its flap 2b to come into contact with the room-side end face 1b of the frame 1, generating a sufficiently strong sealing pressure.

In the simplest case, a spring 28 acts on the locking slide 22, which is installed in such a way (FIGS. 1 and 3) that it keeps the locking slide 22 constantly under tension in the direction of its unlocked position. Even at a very small opening angle of the wing 2 about the vertical hinge axis 8, the tightening bevel 27 is brought out of engagement with the locking projection 23 and thus the locking device 21 is released for unimpeded opening of the wing 2 about the vertical hinge axis 8.

The control cam 25 on the control arm and / or the actuating projection 24 on the locking slide 22 can be provided in a readjustable manner so that the interaction between the tightening slope 27 of the locking slide 22 and the locking projection 23 is possible in any case. In the simplest case, a stiffly rotatable eccentric 29 can be used as the adjusting member, as is indicated in FIGS. 1 and 2 of the drawing between the control cam 25 and the control arm 18.

In a corresponding manner, of course, the adjusting projection 24 can also be connected to the locking slide 21 in an eccentrically adjustable manner.

So that the locking device 21 is not only forcedly engaged when the wing 2 is closing, but also inevitably moves into its disengaged position when the wing 2 is opening, it is possible to provide the control cam 25 on the control arm 18 with a pressing curve, in addition to the pressing curve 26 30 to equip, as is indicated in Fig. 2 by dash-dotted lines. This pressure curve 30 should have an equidistant arrangement to the pressure curve 26, at least in some areas. However, it can be made shorter than the pressure curve 26, so that it only briefly transmits a restoring movement impulse to the actuating projection 24 and then the further disengagement movement is brought about by the spring 28.

In structural terms, it has proven particularly useful if the frame-side locking projection 23 is located directly on the bearing sleeve of the support arm 5, which forms an essential part of the ball joint 6. It is then possible to use the locking device 21 in the closed position of the wing 2 on the frame 1 to eliminate the bearing play of the ball joint 6 and thereby improve the sealing system between the wing 2 and frame 1.

From Fig. 3 of the drawing it can still be seen that the main link 10 of the display system 4 or the parallelogram steering lever transmission forms rail-shaped fitting part in which the locking slide 22 is accommodated in a longitudinally movable manner. Since, as already mentioned, the rail-shaped fitting part forming the main link 10 is accommodated in the stepped profile groove 11 of the wing 2, the locking slide also lies in the region of this profile groove. Merely the adjusting projection 24 and the end of the locking slide 22 having the bevel 27 protrude from the rail-shaped fitting part in order to bring about the engagement and disengagement of the locking device 21.

From FIGS. 4 and 5 of the drawing it follows that the parallelogram steering lever transmission does not necessarily have to be used as the display systems 34 between the frame 1 and the sash 2 of a window or a door. 4 and 5 are steering lever gears, which on the one hand have a mounting rail 35 fastened to the rebate peripheral surface 1a of the frame 1 and on the other hand have a holding rail 36 fastened to the rebate peripheral surface 2a of the wing 2. Bearing rail 35 and holding rail 36 are connected to one another via two steering levers 37 and 38, which have different length dimensions. The rear steering lever 37 is dimensioned shorter than the front steering lever 38. The steering lever 37 is connected to the bearing rail 35 via a hinge pin 39 only in a pivotable manner, while, likewise only pivotably, it acts on the holding rail 36 via a hinge pin 40. The steering lever 38 also engages on the one hand via a hinge pin 41 only pivotably on the bearing rail 35, while it is only pivotally connected to the holding rail 36 via a hinge pin 42. In the steering trapezoid formed in this way, the shortest transmission link is formed by the wing-side holding rail 36, because the hinge pins 40 and 42 have a distance therefrom which is smaller than the distance between the articulation points between all the other links of the steering trapezoid.

A locking device 43 is assigned to the opening system 34 according to FIG. 4, which is controlled as a function of the closing and / or opening movement of the leaf 2 relative to the frame 1.

In a similar way to the locking device 21 according to FIGS. 1 to 3, the locking device 43 according to FIG. 4 also has a locking slide 44 which is guided on the wing 2 parallel to the main plane of the wing 2, for example on the holding rail 36. The locking slide 44 has an actuating projection 45 which can cooperate with a control cam 46 which sits on the longer steering lever 38.

Adjustment projection 45 and control cams 46 are arranged and designed relative to one another in such a way that they meet during the closing movement of the wing 2, even before the wing 2 has reached its final closed position on the frame 1. In the course of the further closing movement of the leaf 2, the pressure curve 47 of the control cam 46 then acts on the actuating projection 45 and thereby causes the Riegl slide 44 to be actuated. The locking slide 44 meets a locking projection 49 on the frame side and thereby presses the leaf 2 with the back of the rollover 2b in the direction transverse to its main plane against the room-side end face 1b of the frame 1.

The structure and mode of operation of the locking device 43 according to FIG. 4 basically correspond to the structure and mode of operation of the locking device 21 according to FIGS. 1 to 3. The only difference here is that the control cam 46 is not carried by a special control arm, but rather on the longer steering lever 38 of the steering lever gear 34 designed as a trapezoidal seat.

In the embodiment of an opening system 34 shown in FIG. 5 of the drawing, an arrangement of the locking device 43 that is kinematically reversed with respect to FIG. 4 is provided.

The locking slide 44 with the adjustment projection 45 is not located there on the wing-side holding rail 36, but instead is longitudinally adjustable on the frame-side bearing rail 35. On the other hand, however, the locking lug 49 on the frame side is not present, but rather the bevel 48 of the locking slide 44 cooperates with the pivot pin 40, which connects the shorter steering lever 37 to the wing-side holding rail 36.

In the opening system 34 according to FIG. 5 of the drawing, the control cam 46 with its pressing curve 47 is also provided on the longer steering lever 38. The arrangement of the control cam 46 is such that its pressure curve 47 already meets the actuating projection 45 of the locking slide 44 before the wing 2 has reached its final closed position on the frame 1.

An essential feature of all the above-described embodiments of locking devices 21 and 43 is that their locking slide, which is equipped on the one hand with an actuating approach and on the other hand with a bevel, cooperates with the neighboring opening system for the wing, designed as a steering lever mechanism, via a control cam which is connected to a control arm or steering lever of the Steering lever gear sits and already comes into operative connection with the actuating approach at which the control arm or steering lever in question lies at least in regions with an inclined position in front of the end face 1b of the frame 1 on the room side. It is thus ensured that the actuation of the respective locking device 21 or 43 begins at an early stage before the leaf 2 on the frame 1 is reached.

Claims (9)

1. A locking device (21) for windows or doors or the like whose moving member (panels) (2) are pivotally connected to the associated fixed frame (1) by way of linkages (5, 10, 12, 13, 18) which are effective as stay systems (4), extend completely concealed between the rebates (2a and 1a) in the panel (2) and in the fixed frame (1) and comprise: a carrying link (5) so suspended on the fixed frame (1) as to be merely pivotable (6); a main link (10) connected to the panel (2); and two connecting links (12, 13) also connected merely for pivoting (14-17) to the carrying link (5) and main link (10), one (13) of the connecting links (12, 13) being retained in adjustable engagement with the fixed frame (1) by an actuating arm (18), e.g. by way of a guide slot (20), characterised in that a sliding bolt (22) is so disposed on the panel (2) as to be guided for movement parallel to the panel plane an extends at least intermittently by way of a stud or the like (24) into the movement path of an actuating cam (25) disposed on the actuating arm (18), and as the panel (2) approaches the fixed frame (1) during its closing movement the sliding bolt (22), actuated by way of the stud (24) and cam (25), can be engaged by way of a securing bevel (27) behind a projection (23) on the fixed frame (1), the latter projection being disposed at least near the suspension pivot bearing (6) for the carrying link (5).

2. A locking device (43) for windows or doors or the like whose moving members (panels) (2) are pivotally connected to the associated fixed frame (1) by way of linkages (35-38) comprising: a bearing rail (35) adapted to be secured in the rebate (1a) of the fixed frame (1); a retaining rail (36) adapted to be secured in the rebate (2a) in the panel (2); and two links (37, 38) which differ in length from one another, are each connected by way of respective pivot bearings (39-42) to the bearing rail (35) and retaining rail (36) and co-operate with them to form a link trapezium whose shortest member is the panel-mounted retaining rail (36), characterised in that a sliding bolt (44) is so disposed on the panel (2) as to be guided for movement parallel to the panel plane and extends at least intermittently by way of a stud or the like (45) into the movement path of an actuating cam (25) disposed on the longer link (38), and as the panel (2) approaches the fixed frame (1) during its closing movement the sliding bolt (44), actuated by way of the stud (45) and cam (46), engages by way of a securing bevel (48) by way of a projection (49) on the fixed frame (1), the latter projection being disposed on the fixed frame (1) at least near the place (40) where the shorter link (37) is pivotally connected to the panel (2).

3. A locking device (43) for windows or doors or the like whose moving members (panels) (2) are pivotally connected to the associated fixed frame (1) by way of linkages (35-38) which are effective as stay systems (34) and extend completely concealed between the rebates (2a and 1a) of the panel (2) and fixed frame (1), the linkages (35-38) comprising a bearing rail (35) disposed in the rebate (1a) of fixed frame (1); a retaining rail (36) adapted to be secured in the rebate (2a) in the panel (2); and two links (37, 38) which differ in length from one another, are each connected by way of respective pivot bearings (39-42) to the bearing rail (35) and retaining rail (37) and co-operate with them to form a linkage trapezium whose shortest member is the panel-mounted retaining rail (36), characterised in that a sliding bolt (44) is so disposed on the fixed frame (1) as to be guided for movement parallel to the plane of the fixed frame (1) and extends at least intermittently by way of a stud or the like (45) into the movement path of an actuating cam (46) disposed on the longer link (38), and as the panel (2) approaches the fixed frame (1) during its closing movement the sliding bolt (44), actuated by way of the stud (45) and cam (46), can be engaged by way of a securing bevel (48) behind a projection (40) on the panel, the latter projection being disposed at least near the panel-associated pivot joint (40) for the shorter link (37).

4. A locking device according to any of claims 1, 2 and 3, characterised in that the cam (25, 46) on the actuating arm (18) or longer link (38) respectively has a respective pressing-on cam (26, 47 respectively) and, equidistant therefrom at least zonewise, a pressing-off cam (30) between which the stud (24, 45) of the sliding bolt (22, 44) engages at least when the panel (2) is in engagement with the fixed frame (1) in the closed position.

5. A locking device according to any of claims 1, 2, 3 and 4, characterised in that the sliding bolt (22, 44) is permanently spring-biased (28) towards its release position.

6. A locking device according to any of claims 1, 2, 3, 4 and 5, characterised in that the cam (25, 46) on the actuating arm (18) or longer link (38) and/or the stud (24, 45) on the sliding bolt (22, 44 respectively) are readjustable.

7. A locking device according to any of claims 1 and 4 to 6, characterised in that the projection (23) on the fixed frame is embodied by a bearing bush (23) of the carrying link (5), such bush extending for pivoting around a pivot pin (6) on the fixed frame (1).

8. A locking device according to any of claims 1, 2 and 4 to 7, characterised in that the sliding bolt (22, 44) is guided on or in a rail-like component (10) which is receivable in a shaped groove (11) in the rebate surface (2a) of the panel (2) and either is itself effective as the main link (10) or retaining rail (36) of the linkage or is securing base for a main link serving as turn-tilt stay arm.

9. A locking device according to any of claims 3-6, characterised in that the sliding bolt (44) is guided on the bearing rail (35) securable in the fixed frame rebate (1a) and can by way of its securing bevel (48) be moved into and out of locking engagement with the panel-associated pivot pin (40) for the shorter link (37).

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