EP0668427B1 - Fittings for doors, windows or the like - Google Patents

Abstract

The fitting has a pane or panel (2) which is operable at least around a movement axis has a frame (4) the profiles of which are partic. of metal and/or plastic. The frame has a rabbet surface which is provided with a back-cut profiled guide channel for longitudinally displaceably accommodation of at least one drive rod (8,9). A bracing gear (5) is provided, the housing (6) of which is fixable to the face surface (12) of the frame (4). In the housing (6) is a rotatably located hand grip (7) for operation of an all-round toothed pinion and in the housing are two counter-running, longitudinally displaceable toothed slides meshing with the pinion. On the rear side of each toothed slide extends a driver tongue which extends through a common slit of a cover plate releasable connected to the housing.

Description

The invention relates to a fitting according to the preamble of the main claim.

Expansion gearboxes of this type are used in particular in the case of sashes of windows or doors which can be moved about a vertical axis and whose sash and window frames are composed of extruded profiles made of plastic or light metal. The expansion gear is placed on the end face of the casement and fastened with screws. Two driver tongues protrude through a longitudinal milling of the flap of the sash profile into the area of the sash rebate-side guide channel and are positively connected there with coupling halves slidably mounted in the guide channel, which in turn interact with two drive rods that are also longitudinally displaceable in the guide channel. The driver tongues are moved towards or away from one another by a 90 ° rotation angle movement of the handle, and thus the two drive rods are also given an opposite movement.

In such expansion gears, efforts are made to enable either a left-handed or a right-handed stop with a single embodiment. To change the stop, the housing of the expansion gear is turned 180 ° around the axis of rotation of the handle and the pinion. This turning, however, requires a change in the angle of rotation of the handle, which is mostly blocked by the fact that both driving tongues which are longitudinally displaceable in the same longitudinal slot of the cover plate come to rest against one another with their end faces.

In the case of a generic fitting according to EP 0 491 133 A1, the housing of the expansion gear is symmetrical to a transverse plane which extends through the axis of rotation of the handle and the pinion extends, perpendicular to the direction of movement of the toothed slide and thus the drive rods. The housing, which has a flat rectangular cross section, is also symmetrical to its longitudinal center plane, which extends perpendicular to the aforementioned plane. The longitudinal slot of the cover plate holding the toothed slide inside the housing is laterally offset with respect to the longitudinal center plane of the housing, predetermined by the installation conditions on the casement. The toothed slides, where the toothed rack, base plate and driving tongue are formed in one piece, are designed symmetrically to a transverse plane which extends through the center of the width of the driving tongue and the center of the length of the toothed rack. In particular, the total length of each toothed rack is doubled compared to the required effective length, which also requires the housing-side guides for the toothed slide to be extended to twice the overall length of the toothed rack.

To change the stop direction, the cover plate must be loosened. Then each tooth piece must be lifted out of engagement with the pinion. Now the tooth pieces in the area of their guides can be shifted longitudinally in opposite directions to one another until their driver tongues assume a mutually exactly reversed position in which they in turn have to be brought into engagement with the pinion. Finally, the cover plate has to be replaced. This procedure requires a careful procedure to avoid incorrect setting of the toothed slide. Disassembly and assembly operations are also necessary and the housing is elongated.

To change the stop direction in expansion gears, it is also known for each type of stop suitable toothed slide to use and exchange them.

DE-P 3 445 170 proposes to provide the toothed strips with toothing on both sides and to detachably attach the driving tongue to the toothed slide. The stop direction is changed by turning each toothed slide by 180 ° around its longitudinal axis and repositioning while simultaneously displacing the driver tongues.

In the embodiment according to EP 0 446 566 A1, each toothed slide is constructed in a cross-symmetrical manner and provided with two bearings for the driver tongue. To change the stop direction, the toothed slides are also to be lifted out of engagement with the pinion and longitudinally displaced in their respective guidance with subsequent repositioning of the driving tongue.

The change in the stop direction for expansion gearboxes therefore requires the cover plate to be released, the toothed slide to be uncoupled from the pinion and the position of the toothed slide to be changed, sometimes with displacement of the catch tongue releasably mounted on the toothed slide, re-engagement of the toothed slide and pinion and the renewed application of the cover plate .

The object of the invention is to avoid the disadvantages of the known fittings with expansion gears and to create a fitting with an expansion gear that does not require any intervention in the drive means of the housing to change the type of stop with a compact design of the housing and a structural simplification of the drive means.

To achieve this object, it is proposed according to the invention that the fitting is designed according to the preamble of claim 1 in accordance with the features of the characterizing part of this claim.

The toothed slides are designed and mounted in the housing in such a way that the driver tongues are longitudinally displaceable past one another and are arranged substantially congruently in the middle switching position of the handle. As a result of this configuration, an angular movement of the handle from the middle switch position into both oppositely directed end switch positions is made possible, the longitudinal displacement path of the oppositely moving driver tongues being the same regardless of whether the handle is in the one end switch position, e.g. B. with vertical orientation of the handle and free end of the handle is directed downwards or whether the free end of the handle is directed upwards in the other limit switch position. There is therefore an associated range of rotation angles of the handle available for each type of stop, which are oriented in opposite directions. After turning the expansion gear by 180 ° about the axis of rotation of the handle and the pinion when arranging the handle in the middle switch position to change the stop type, the opposite rotational angle movement of the handle, which is then required, is ensured. After setting the desired stop type, the angle of rotation range of the handle that is no longer required for sash actuation must be blocked, for example by blocking the handle, pinion or slide. This locking can also take place in particular via the linkage arranged in the fold of the sash frame, that is to say with the placement of the housing of the expansion gear on the end face of the frame of the sash, for. B. also by means of the coupling connecting the expansion gear with the connecting rods.

The change of the type of stop is thus possible without disassembly or assembly of components of the expansion gear and any errors that may occur are eliminated. An additional design effort is not necessary, especially since the toothed slide can be designed in one piece. Despite the lateral offset of the longitudinal displacement plane of the driver tongues relative to the longitudinal center plane of the housing of the expansion gearbox, two fastening screws to be attached to the same side of the longitudinal center plane of the housing are sufficient for fixing the expansion gearbox to the frame of the wing. The overall length of the housing is also reduced, since the length of the toothed rack of the toothed slide no longer has to correspond to twice the longitudinal displacement path.

In the case of the coupling piece accommodated in the sash frame side guide channel, the coupling halves of which are coupled to the drive rods, their receptacles for the positive and non-positive connection with the driver tongues of the two toothed slides are also one above the other and shift during the angular movement of the handle Coupling halves against each other, with one coupling half covering the other.

In the case of a fitting with Z-shaped toothed slides in cross section, the base plates of which are arranged parallel to the cover plate and are of unequal width and the width of the longitudinal slot approximately corresponds to the thickness of the driver tongues, it is expedient if the thickness of each driver tongue in the transverse plane of symmetry is approximately is adapted to half the width of the longitudinal slot and the adjacent side walls of the driver tongues are adjacent to one another in the middle switching position. The space requirement in the transverse plane of the housing remains unchanged since the total thickness of the two driver tongues corresponds to the thickness that the previously used driver tongues have. At the same time, the driver tongues can support one another.

The guidance of the two toothed slides during their opposite movement is improved in that one of the toothed slides is provided with a support web projecting beyond the contact plane of the driving tongues, which is arranged under a longitudinal groove of the other toothed slider. Support web and longitudinal groove are formed within the thickness range of the base plate of the toothed slide.

In order to facilitate the introduction of the driver tongues into the associated receptacles of the coupling halves which are mounted in the guide channel so as to be longitudinally displaceable during the attachment of the expansion gear to the frame of the wing, the free end of each driver tongue is provided with an insertion bevel.

If each coupling half is provided with a pin for hanging into a bore of the drive rod to be assigned and with guide webs engaging behind the undercuts of the guide channel, it is favorable to achieve a compact construction of the coupling piece that one of the coupling halves at least in the area of the receptacle for one of the driving tongues formed a narrower width and this stepped end is guided in a longitudinal recess of the other coupling half.

The free front surface of the offset end of one coupling half is in the middle switch position on the end boundary wall of the longitudinal recess of the other coupling half, so that without additional effort the angular range of movement of the handle that is no longer required after connecting the driver tongues of the expansion gear to the coupling piece is blocked by the block position of the two coupling halves.

To simplify the assembly of the two coupling halves pushed into the guide channel of the frame of the wing and at the same time to improve the support of the offset end of the one coupling half, it is advantageous to provide the offset end of the one coupling half with the other coupling half on the side of the longitudinal recess, and the receptacle to limit with transverse approaches that protrude beyond the longitudinal recess. By means of the guide strips and the transverse lugs, which overlap the longitudinal recess of the other coupling half on one or both sides, the stepped end is guided, held and supported on all sides on the other coupling half.

The reception of the other coupling half can be formed by a flange aligned parallel to the longitudinal recess and largely covering it.

It is particularly expedient to provide the undercut walls of each receptacle with an undercut and to equip each driver tongue in the region of the end faces with a correspondingly tapered cross section in order to obtain a sufficient force transmission surface with a specifically low load. At the same time, this configuration enables the recordings to be opened towards the other recording. The package strength in the area of the recordings can thus be kept low. At the same time, the interlocking undercuts prevent undesired lifting of the driver tongues from the associated receptacles.

The recordings of the two coupling halves extend in the plane of the driver tongues each over the entire width, so that they are open on both sides in this plane and the introduction of the driver tongues of the expansion-side toothed slide can take place from both sides of the coupling piece.

The object of the invention is explained in a schematic representation with reference to the drawing of an embodiment.

Fig. 1

ein Fenster mit Beschlag und Spreizgetriebe mit Rechtsanschlag,

Fig. 2

eine entsprechende Darstellung gemäß Fig. 1 mit Linksanschlag,

Fig. 3

einen Schnitt III-III aus Fig. 1 in vergrößertem Maßstab,

Fig. 4

einen entsprechenden Schnitt IV-IV aus Fig. 2,

Fig. 5

eine Rückansicht gemäß dem Pfeil der Fig. 3 auf das Spreizgetriebe bei abgenommener Deckplatte und bei Mittelschaltstellung,

Fig. 6

eine der Fig. 5 entsprechende Darstellung bei Endschaltstellung des Handgriffs und bei teilweise dargestellter Deckplatte,

Fig. 7

eine Rückansicht gemäß dem Pfeil in Fig. 4 auf das Spreizgetriebe bei abgenommener Deckplatte und bei Mittelschaltstellung,

Fig. 8

eine der Fig. 7 entsprechende Darstellung bei Endschaltstellung des Handgriffs,

Fig. 9

die beiden Kupplungshälften des Kupplungsstücks in Draufsicht und

Fig. 10

in Seitenansicht.

Show it

Fig. 1

a window with fittings and a spreading gear with a right-hand stop,

Fig. 2

1 with left stop,

Fig. 3

2 shows a section III-III from FIG. 1 on an enlarged scale,

Fig. 4

a corresponding section IV-IV of Fig. 2,

Fig. 5

3 shows a rear view according to the arrow in FIG. 3 of the expansion gear with the cover plate removed and in the middle switch position,

Fig. 6

5 shows a representation corresponding to FIG. 5 when the handle is in the end switch position and with the cover plate partially shown,

Fig. 7

4 shows a rear view according to the arrow in FIG. 4 of the expansion gear with the cover plate removed and in the middle switch position,

Fig. 8

7 shows a representation corresponding to FIG. 7 in the end switch position of the handle,

Fig. 9

the two coupling halves of the coupling piece in plan view and

Fig. 10

in side view.

1 and 2 consists of the fixed frame 1 and a wing 2, the frame 4 is articulated by means of hinges 3 on the fixed frame 1 as a rotating wing, namely pivotable about the movement axis formed by the hinges 3. On the side of the wing 2 facing away from the movement axis, an expansion gear 5 with its housing 6 is placed on the end face 12 of the frame 4 and fixed by means of fastening screws. The housing 6 carries a handle 7 which is rotatably mounted therein and which acts on connecting rods 8, 9 which are connected to one another by a coupling piece 10 and which are moved in opposite directions in order to lock or unlock the wing 2 and the fixed frame 1.

Fig. 1 shows the right stop and Fig. 2 the left stop. The handle 7 of the expansion gear 5 is in the fully extended position in the horizontal, with the free end 11 directed against the axis of movement. This represents the middle switch position, in which the wing 2 is unlocked and thus movable about the axis of movement. The limit switch position is shown in dashed lines, the handle 7 being oriented vertically with the free end 11 pointing downward. This represents the locking switch position in which the wing 2 is locked against the fixed frame 1.

3 and 4, the detailed structure of the fitting, in particular the expansion gear 5 and the coupling piece 10 can be seen.

The housing 6 of the expansion gear 5 surrounded by a cover 13 supports the neck 14 of the handle 7, which carries an all-round toothed pinion 15 which interacts with a toothed slide 16 of small width and a toothed slide 17 of greater width. Both toothed slides 16, 17 have a Z-shaped cross section and consist of the toothed rack 18, the base plate 19 and the driver tongue 20. The toothed strips 18 engage in guides 21 of the housing 6, which extend along the longitudinal walls of the elongated, rectangular in cross section The housing 6 extends and meshes with diametrically opposite circumferential sides of the pinion 15. In order that the toothed slides 16, 17 are held within the housing 6, the underside of the pinion is closed with a detachable cover plate 22 which has a longitudinal slot 23 for the passage of the driver tongues 20.

In the state of the expansion gear 5 attached to the wing 2, the driver tongues 20 interact with receptacles 24 of the coupling piece 10, which is mounted in a longitudinally displaceable manner in the guide channel 25 on the folded surface 26 of the wing 2, in which the drive rods 8, 9 are also located. The undercut guide channel 25 is part of a hollow profile made of light metal, from which the frame 4 of the wing 2 is formed.

The coupling piece 10, as FIGS. 9 and 10 reveal, is formed from two coupling halves 27, 28. Each of the coupling halves 27, 28 carries at one end a pin 29 for hanging into a bore 30 of a drive rod 8, 9. Each coupling half 27, 28 has guide ribs 31 for engagement with the undercuts of the guide channel 25 provided. The coupling half 28 is offset over a part of its length, which extends beyond the area of the receptacle 24, to a narrower width. This stepped end 32 of the coupling half 28 is equipped with laterally projecting guide strips 33. The receptacle 24 is delimited by two transverse projections 34, which project beyond the offset end 32 on both sides in width.

The receptacle 24 of the other coupling half 27 is accommodated in a flange 35 which is arranged at such a distance from the guide webs 31 that the area of the receptacle 24 is arranged outside the guide channel 25 when the coupling half 27 is pushed into the guide channel 25. Starting from the end face 37 of the coupling half 27 adjacent to the other coupling half 28, a longitudinal recess 36 extends over the area of the recess 24 and thus covered by the flange 35 for the positive and displaceable receiving of the stepped end 32 of the one coupling half 28. The stepped end 32 engages under its guide strips 33 the coupling half 27 and overlaps with its transverse projections 34 this coupling half 27 on both sides of the longitudinal recess 36. The transverse walls 38 of the receptacles 24 arranged transversely to the longitudinal sliding direction are each provided with an undercut 39.

In the middle switch position of the expansion gear 5 shown in FIGS. 1 and 2 or 5 and 7 with the wing 2 unlocked, the handle 7 extends horizontally. Both toothed slides 16, 17 are arranged opposite one another, the two side walls 40 of the driver tongues 20 being adjacent to one another. The housing 6 is formed symmetrically to a transverse plane G, which extends through the axis of rotation 41 of the handle 7 and of the pinion 15 extends and perpendicular to the longitudinal orientation of the housing 6 and thus also perpendicular to the direction of displacement of the toothed slide 16, 17, the coupling piece 10 and the drive rods 8, 9. Likewise, the housing 6 is symmetrical about a longitudinal center plane L. The toothed slides 16, 17 are also symmetrical about a transverse plane Z extending perpendicularly through the toothed strips 18 and the driver tongues 20 to the said longitudinal displacement direction. In the middle switch position, the transverse planes Z of the two toothed sliders 16, 17 coincide with the same arrangement of the driver tongues 20 the transverse planes Z in the transverse plane G.

5, it is ready for installation for a right-hand stop, as in FIG. 1. For this purpose, the driver tongues 20 are pushed through a longitudinal milling 42 in the overlap 43 of the frame 4 of the wing 2 and into the receptacles 24 of the coupling piece 10 introduced. This is facilitated by insertion bevels 44 attached to the free ends of the driver tongues 20. After the expansion gear 5 has been fixed on the wing 2, the fitting can be actuated. For this purpose, the handle 7, starting from FIG. 1, is to be moved in a clockwise direction through a range of rotation angle of 90 °. The pinion 15, which is positively connected to the neck 14 of the handle 7, thereby rotates about the axis of rotation 41 and the toothed slide 16 from FIG. 5 moves upward while the toothed slide 17 is moved downward. This opposing longitudinal displacement of the toothed slide 16, 17 is stopped by striking the end edges 45 of the toothed slide 16, 17 on the walls 46 of the housing 6. This reaches the end switch position of the handle 7, which is shown in broken lines in FIG. 1. During this change in the angle of rotation, the oppositely longitudinally moving driver tongues 20 move the coupling half 27 with the coupled drive rod 8 upwards and the coupling half 28 with the drive rod 9 downwards, achieving the locking between sash 2 and fixed frame 1.

When the handle 2 moves back, the stepped end 32 of the coupling half 28 continues into the longitudinal recess 36 of the coupling half 27. This movement is limited by the striking of the front surface 47 of the stepped end 32 of the coupling half 28 on the end delimitation wall 48 of the longitudinal recess 36 of the coupling half 27. The handle 7 is now again in the middle switch position. The angle of rotation limitation is aligned to 90 ° when the expansion gear 5 is mounted on the wing 2 and connected to the coupling halves 27, 28.

If a change of stop is to be made, starting from the arrangement of the expansion gear 5 according to FIGS. 1 and 5 to the arrangement according to FIGS. 2 and 7, the expansion gear 5 not yet attached to the wing 2 must be turned as a whole by 180 ° about the axis of rotation 41 . In order to reach the end switch position with the handle 7 arranged vertically and the free end 11 pointing downward, a counter-clockwise rotation movement of 90 ° must now be carried out in the counterclockwise direction. This also causes the drivers to move in the opposite direction to the right-hand stop.

Since the driver tongues 20, starting from the middle switch position, can be moved freely from one another in both longitudinal displacement directions, the handle 7 of the expansion gear 5 can be rotated into both end switch positions when it is not installed on the wing 2, that is to say both by 90 ° clockwise and by 90 ° counterclockwise, the drivers 20 each the same Have degree of displacement, but in each case in the opposite direction.

After turning the expansion gear 5 about the axis of rotation 41 by 180 °, it is to be mounted in this position on the wing 2 of FIG. 2. If the handle 7 is now moved counterclockwise through 90 °, the toothed slide 16 moves upward and the toothed slide 17 moves downward. The end switch position is in turn reached by the abutment of the end edges 45 of the toothed slide 16, 17 on the wall 46 of the housing 6. The limitation when the handle 7 is returned is in turn caused by the abutment of the front surface 47 of the coupling half 28 on the end boundary wall 48 of the lung half 27 .

The expansion gear 5 can thus be used left-right without loosening the cover plate and without changing the structure of the expansion gear 5.

The cover plate 22 no longer has to be releasably attached to the housing 6, as was previously necessary to enable the toothed slide or driver tongues to be moved. The cover plate 22 only has the purpose of holding the parts stored in the housing 6 together and protecting them from being lost. The cover plate can even be omitted entirely if the toothed slides 16, 17 are captively supported relative to the housing 6 by appropriate design measures.

To improve the mutual support and to facilitate the insertion of the toothed slide 16, 17 in the manufacture of the expansion gear 5, the toothed slide 16 carries one of the base plate 19 over its side wall 40 projecting support web 49 which projects into a longitudinal groove 50 of the other toothed slide 17 and supports this toothed slide 17.

Between the handle 7 and / or the pinion 15 and the housing 6, resilient latching elements can be provided in a manner known per se, which have latching angle spacings of 90 °, around the handle 7 each after angular movements of 90 ° in the middle switching position or to fix in the limit switch positions with a given holding force, so that the risk of setting 90 ° positions deviating, unsightly intermediate oblique positions of the handle 7 is reduced.

Claims (12)

1. Fitting for windows or doors, wherein one sash (2), which is actuatable about at least one axis of movement, comprises a frame (4) fonned from profiles, more especially fonned from metal and/or plastics material, said frame being provided, on its face (26), with an undercut profiled guide channel (25) for the longitudinally displaceable accommodation of a connecting rod (8, 9), which fitting has an expanding gear (5), the housing (6) of which is positionable on the end face (12) of the frame (4) and securable thereto, said fitting having a handle (7) which is rotatably mounted in the housing (6), for actuating a pinion (15) which is toothed in all directions, said fitting having two toothed slides (16, 17), which are guided so as to be longitudinally displaceable in opposite directions in the housing (6) and engage with the pinion (15) on diametrically opposite circumferential sides, and a respective entrainment projection (20) which protnides from the rear side of each toothed slide (16, 17), said projections protniding through a common elongate slot (23) of a cover plate (22), which is possibly detachably connected to the housing (6), the elongate slot (23) being disposed so as to be laterally offset relative to the longitudinal central plane of the housing (6), and the entrainment projections (20) being intended for the force-locking connection to a coupling element (10), which is longitudinally displaceably interposed between two connecting rods (8, 9) in the guide channel (25) of the frame (4), and the coupling element (10) comprises two coupling halves (27, 28), which are longitudinally displaceably guided in opposite directions, each coupling half (27, 28) comprising a receiving means (24) for connection to the respective entrainment projection (20) and also being connectable to one of the connecting rods (8, 9), and the housing (6) being configured symmetrically relative to a transverse plane (G), which extends through the axis of rotation (41) of the handle (7) and of the pinion (15) and is disposed perpendicular to the direction of longitudinal displacement of the toothed slide (16, 17), coupling element (10) and connecting rod (8, 9), and each toothed slide (16, 17) also being configured symmetrically relative to a transverse plane (2), which extends through the toothed bar (18) and the entrainment projection (20) and is disposed perpendicular to the direction of longitudinal displacement, and the handle (7) being disposed in the central switching position in said transverse plane, the entrainment projections (20) of the toothed slides (16, 17) being disposed adjacent one another, and the handle (7) extending in the direction of longitudinal displacement in each of the two final switching positions, the free end (11) of the handle (7) being directed downwardly in the first final switching position and upwardly in the second final switching position, and the entrainment projections (20) each moving away from one another when the handle (7) is changed from the central switching position into the final switching position, characterised in that the entrainment projections (20) are configured so as to be displaceable past one another in the common elongate slot (23), the transverse planes of symmetry of the two toothed slides (16, 17) being disposed in a common plane in the central switching position of the handle (7), and in that the coupling halves (27, 28) are configured to be displaceable one over the other at least with their regions carrying the receiving means (24) for the entrainment projections (20) of the toothed slides (16, 17), and the receiving means (24) lie above one another substantially over the same area in the central switching position of the handle (7), and in that, after the expanding gear (5) has been attached to the coupling element (10) according to the desired kind of abutment, the angular rotary movement of the handle (7) is locked into the final switching position, which is no longer operationally required.
2. Fitting according to claim 1, having toothed slides (16, 17), which have a Z-shaped cross-section and base plates (19), which are disposed parallel to the cover plate (22) and have different widths, the width of the elongate slot (23) corresponding substantially to the thickness of the entrainment projections (20), characterised in that the thickness of each entrainment projection (20) in the transverse plane of symmetry is adapted to substantially half the width of the elongate slot (23), and the adjacent lateral walls (40) of the entrainment projections (20) lie adjacent one another in the central switching position.
3. Fitting according to one of claims 1 and 2, characterised in that one of the toothed slides (16) is provided with a support web (49), which protnides beyond the abutment plane of the entrainment projections (20) and is disposed so as to engage beneath a longitudinal groove of the other toothed slide (17).
4. Fitting according to one of claims 1 to 3, characterised in that each entrainment projection (20) in the region of the end faces is provided with a cross-section, which tapers in the plane parallel to the cover plate (22).
5. Fitting according to one of claims 1 to 4, characterised in that the free end of each entrainment projection (20) is provided with an inclined insert (44).
6. Fitting according to one of claims 1 to 5, wherein each coupling half (27, 28) is provided with a journal (29) for mounting in a bore (30) of the associated connecting rod (8, 9) and with guide webs (31), which engage behind the undercut portions of the guide channel (25), characterised in that one of the coupling halves (28) is configured to be reduced to a narrower width, at least in the region of the receiving means for one of the entrainment projections (20) and this reduced end (32) is guided in a longitudinal recess (36) of the other coupling half (27).
7. Fitting according to claim 6, characterised in that the free front face (47) of the reduced end (32) of one coupling half (28) in the central switching position abuts against the end boundary wall (48) of the longitudinal recess (36) of the other coupling half (27).
8. Fitting according to one of claims 6 or 7, characterised in that the reduced end (32) of one coupling half (28) is provided with guide bars (33), which engage beneath the other coupling half (27) laterally of the longitudinal recess (36), and in that the receiving means (24) is defined by transverse extension members (34) which protrude beyond the longitudinal recess (36).
9. Fitting according to one of claims 1 and 6 to 8, characterised in that the receiving means (24) of the other coupling half (27) is formed by a flange (35), which is orientated parallel to the longitudinal recess (36) and largely covers said recess.
10. Fitting according to claim 9, characterised in that the boundary walls (38) of each receiving means (24) are each provided with an undercut portion (39).
11. Fitting according to one of claims 6 to 10, characterised in that one receiving means (24) is configured to be opened in the direction towards the counter-receiving means (24).
12. Fitting according to one of claims 6 to 11, characterised in that the receiving means (24) in the plane of the entrainment projections (20) extend over the entire width of the coupling halves (27, 28).

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