The invention relates to a device for a pivot fitting for an opening window, wherein the fitting includes a mounting plate arranged to be fixed to a window frame, a support plate arranged to be fixed to a window sash, first and second arms which are connected by their end portions to the mounting plate and the support plate, the first arm being rotatably attached to a first end portion of the mounting plate and a first portion of the support plate, and the second arm being rotatably attached to a second end portion of the mounting plate and a second portion of the support plate, and a safety device forms a releasable connection between the second end portion of the mounting plate and a middle portion of the first arm as a locking plate is arranged in a plane that lies between the mounting plate and the first arm, rotatable around an axis of rotation perpendicular to said plane, the locking plate further being provided with means arranged to engage an engagement element arranged on the first arm.

For an opening window, the use of pivot fittings to enable the window to be pivoted out of a frame from a closed

position into an open ventilating position, preferably also into a position in which the outside of the window faces inwards for cleaning or other maintenance, is very

widespread. As a rule, such fittings include safety devices to prevent inadvertent opening of the window from a restricted ventilating position into full opening, a so- called child restrictor, and it is also known to include a wind restrictor device that prevents a window under the influence of strong wind from being closed by the wind forces .

From WO91/02874 a pivot fitting is known, wherein, at a hinging point between a mounting plate fixed to a frame and an upper arm extending between the upper end of the mounting plate and a lower end of a support plate fixed to the window sash, a rotatable, plate-shaped lock is arranged, provided with a cut-out arranged to engage a holding element

projecting from a lower arm extending between the mounting plate and the support plate.

From WO03/2021066 a pivot fitting is known, wherein a plate- shaped locking member is rotatably arranged at a lower portion of a mounting plate arranged on the frame, a

projecting portion of the lower part of the locking member being arranged to engage a blocking member, for example a hook, on a support plate arranged on the sash.

From NO 315986 a pivot fitting is known, wherein a locking member is arranged between a support plate arranged on the sash and an upper portion of a frame attachment, possibly between an intermediate arm and a middle part of the frame attachment, a locking pin projecting from a securing arm being arranged to lockingly engage the sliding groove of a lock/release unit.

Pivot fittings are also known in which, on a lower arm extending between a lower portion of a mounting plate on a frame and a support plate on a sash, a projecting plate portion is arranged, provided with a locking dog which is arranged to releasably engage a movable locking device arranged on a middle portion of the mounting plate.

Operating the child and wind restrictors of the window can be complicated. Furthermore, the integration of such safety elements often leads to the need for a great range of fitting sizes to cover a relevant assortment of windows. This requires extensive stockholding at a window producer, and the production of pivot fittings becomes inefficient.

The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art, or at least provide a useful alternative to the prior art.

The object is achieved through features which are specified in the description below and in the claims that follow.

The invention provides a new detent device for pivot fittings for an opening window, in which a locking plate lies in a plane between a mounting plate, which is arranged to attach the pivot fitting to an internal side surface of a frame in a manner known per se, and a first arm which extends, in a manner known per se, from a rotary joint on the mounting plate, remote from the locking plate, to a support plate arranged to attach the pivot fitting to the external side surface of a window sash. The locking plate is rotatably arranged around an axis of rotation perpendicular to said plane and coinciding with or in the immediate vicinity of an axis of rotation of a second arm which is connected to the mounting plate. The locking plate is provided with a locking- dog recess which is open towards a locking-plate edge surface and arranged to receive an engagement element on a middle portion of the first arm, typically a locking pin projecting substantially perpendicularly from the first arm in the direction of said plane. An outer portion of the locking- plate edge surface forms, in a manner known per se, an inclined plane arranged to slide on said engagement element when, during the closing movement of the window, the

engagement element meets the side edge of the locking plate on its way towards engagement with the locking-dog recess of the locking plate, these elements functioning as a so-called child restrictor, preventing the window from being opened unless the locking plate is operated in a prescribed manner.

In one embodiment, the locking plate is provided with a first detent cut-out arranged at a distance from the axis of rotation of the locking plate. The first detent cut-out is arranged to receive at least a portion of a first detent element which is arranged in the mounting plate, rotatable or movable between a position in which the abutment surface of the first detent element lies at a distance from an abutment surface of the detent cut-out, so that the locking plate can be rotated freely, and a position in which the abutment surface of the first detent element abuts against the

abutment surface of the detent cut-out, preventing the rotation of the locking plate for the disengagement from the engagement element on the middle portion of the first arm. In one embodiment, the axial displacement is provided by a threaded connection between the first detent element and a detent bolt cut-out in the mounting plate into which the first detent element has been inserted. In this embodiment, in its simplest form, the first detent element may be a threaded pin with a recessed, internal hexagon. The first detent element may also be arranged to be moved into the detent cut-out by rotation into abutment against an abutment surface in the detent cut-out, for example an axially

rotatable element provided with a detent pin projecting eccentrically from a top surface of the rotatable element into the detent cut-out. When the abutment portion of the first detent element is moved away from the abutment surface of the detent cut-out, the locking plate may be operated in the normal way; that is to say, the usual child restrictor is operated by the locking plate being rotated until the open locking-dog recess is free from the corresponding locking pin in the first arm, so that the window may be fully opened.

When the abutment portion of the first detent element has been moved into abutment against the abutment surface of the detent cut-out, it will prevent an operation of the locking plate for disengagement from the locking pin, and the child restrictor remains active. The child restrictor can only be released by readjustment of the first detent element, and this will preferably have to happen by the use of a tool. Thereby the extra protection may only be put out of function by a competent person.

The first detent cut-out has an extent in terms of length that allows the necessary rotational movement of the locking plate as the window is being closed. Thereby the first detent element may remain in function in both the closed position and the partially open position (ventilating position) of the window .

In a further embodiment, the locking plate is provided with a second detent element with an abutment portion extending in a direction away from the mounting plate. The second detent element is of such arrangement that said abutment portion can be moved between an inactive position, in which the window may be pushed in into its closed position by pressure, for example wind pressure, from the outside, and an active position, in which the abutment portion abuts against a side edge of the first arm, thereby preventing the window from being pushed inwards into its closed position. The second detent element may be of such arrangement that said abutment portion is moved between the inactive and active positions by rotation of the detent element around an axis of rotation positioned eccentrically, or the detent element being moved in a guiding groove, for example a second detent cut-out in the locking plate.

When the window is in a ventilating position, restricted by the child restrictor and by the second detent element moved into an active position, the adjacent side edge of the first arm will abut against the abutment portion of the detent element as the window is being moved inwards, for example by wind pressure against the window. The window is thereby prevented from being closed without that being the intention. The second detent element is arranged, in its active,

restricting position, to stay fixed in the locking plate or in the side edge of the first arm, for example through the shape of the guiding groove or by a recess having been formed in the side edge of the first arm, against which the abutment portion of the detent element abuts. Wind pressure against the window thereby may not move the detent element away from its blocking position.

In its inactive position, the second detent element will lie outside the sector of rotation of the first arm and thereby will not prevent a movement of the window into its closed position.

The invention relates more specifically to a device for a pivot fitting for an opening window, wherein the fitting includes a mounting plate arranged to be fixed to a window frame, a support plate arranged to be fixed to a window sash, first and second arms which are connected by their end portions to the mounting plate and the support plate, the first arm being rotatably attached to a first end portion of the mounting plate and a first portion of the support plate, and the second arm being rotatably attached to a second end portion of the mounting plate and a second portion of the support plate, and a safety device forms a releasable

connection between the second end portion of the mounting plate and a middle portion of the first arm, as a locking plate is arranged in a plane that lies between the mounting plate and the first arm, rotatable around an axis of rotation perpendicular to said plane, the locking plate further being provided with means arranged to engage an engagement element arranged on the first arm, characterized by the locking plate being provided with a first detent cut-out arranged to receive an outward-projecting portion of a first detent element which is arranged in the mounting plate, said portion abutting, in an active position, against an edge portion of such location that the rotation of the locking plate is restricted to a sector within which it stays engaged with the engagement element, and said portion lying, in an inactive position, at a distance from the edge portion, so that the locking plate may be rotated out of engagement with the detent element .

The first detent element is formed with a threaded connection in a detent bolt cut-out in the mounting plate. The first detent element may be a threaded pin.

Alternatively, the first detent element may be formed

rotationally supported in the mounting plate and provided with an eccentrically arranged abutment portion projecting into the first detent cut-out.

In a top surface facing outwards, the first detent element may be provided with a recess arranged for releasable

engagement with an adjusting tool. In a further embodiment, the locking plate may be provided with a second detent element which includes an abutment portion arranged to abut, in an active position, against a portion of a side edge of the first arm, the second detent element being positioned, in its active position, in such a way that the movement of the first arm towards the second detent element makes the locking plate maintain a locking connection relative to the engagement element, and said abutment portion lying, in an inactive position, at a distance from the side edge, so that the first arm may be rotated into a closed position.

The second detent element may be axially fixed, project in a direction away from the mounting plate and be radially movable in an elongated second detent cut-out between a first, active position and a second, inactive position,

a first cut-out portion exhibiting a shape which, by the movement of the first arm towards the second detent element, is arranged to guide the second detent element to a bottom abutment in said cut-out portion, and

a second cut-out portion extending outside an adjacent side edge of the first arm when the first arm is in its swung- in position.

The second detent cut-out may have approximately an L-, inverted J- or C-shape.

The first cut-out portion and the adjacent side edge of the first arm may diverge in the direction of the first end portion of the mounting plate.

The second detent element may be a rotary body eccentrically supported in the locking plate, and the abutment portion may be arranged remotely from the axis of rotation of the second detent element. The axis of rotation of the locking plate may coincide with an axis of rotation of the second arm.

In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which:

Figure 1 shows a plan of a pivot fitting provided with an active so-called child restrictor with a first embodiment of a first detent element according to the invention, a window which is partially opened and the first detent element forming a so-called child restrictor detent;

Figure 2a shows a side section of a section of the pivot

fitting, in which the first embodiment of the child restrictor detent is inactive;

Figure 2b shows a side section of a section of the pivot

fitting, in which the first embodiment of the child restrictor detent is active;

Figure 3a shows a plan of a section of the pivot fitting

provided with a second embodiment of the child restrictor detent in an inactive position;

Figure 3b shows a plan of a section of the pivot fitting

provided with the second embodiment of the child restrictor detent in an inactive position;

Figure 4 shows a side section of a section of the pivot

fitting provided with the second embodiment of the child restrictor detent in an active position;

Figure 5 shows a plan of the pivot fitting provided with a first embodiment of a second detent element

according to the invention, the window being partially opened, the child restrictor being active, and the second detent element forming a so- called wind restrictor, shown in an inactive position here;

Figure 6 shows a plan of the pivot fitting provided with the first embodiment of the second detent element according to the invention, the window being partially opened, the child restrictor being active and the wind restrictor being active;

Figure 7a shows a plan of a section of the pivot fitting

provided with a second embodiment of the wind restrictor in an inactive position;

Figure 7b shows a plan of a section of the pivot fitting

provided with the second embodiment of the wind restrictor in an active position;

Figure 8 shows a plan of the pivot fitting with the first embodiment of the child restrictor detent and the first embodiment of the wind restrictor according to the invention, the window being partially opened, the child restrictor, wind restrictor and child restrictor detent all being active; and

Figure 9 shows a plan of the pivot fitting with the second embodiment of the child restrictor detent and the second embodiment of the wind restrictor according to the invention, the window being partially opened, the child restrictor, the wind restrictor and the child restrictor detent all being active.

In the figures, the reference numeral 1 indicates a window frame with an internal frame side surface 11 facing the external sash side surface 21 of a window sash 2. The mounting plate 31 of a pivot fitting 3 is fixed, in a manner known per se, to the frame side surface 11, and first and second arms 32, 33 connect, respectively, first and second end portions 311, 312 of the mounting plate 31 to a support plate 34 fixed to the sash side surface 21. The arms 32, 33 are rotatably attached to the mounting plate 31 and the support plate 34.

A safety device 4, also called a child restrictor, is

arranged at the support of the second arm 33 in the mounting plate 31, as a locking plate 41 is rotatably attached to a pivot axle 313 of the second arm 33 arranged in the second end portion 312 of the mounting plate 31, between the

mounting plate 31 and the second arm 32. The locking plate 41 is arranged, in a manner known per se, to releasably engage an engagement element 42 arranged on a middle portion 312 of the first arm 32. In the figures, the engagement element 42 is shown as a pin projecting from the arm 32 parallel to the pivot axle 313. The locking plate 41 is provided with a locking-dog recess 412 extending from an outer edge surface 413, the outer edge surface 413 forming an inclined plane arranged to slide on the engagement element 42 as the locking plate 41 is being engaged with the engagement element 42 by this being brought into the locking-dog recess 412 which exhibits a hook-shape in an outer portion. The locking-dog recess 412 has a shape that provides moving space for the engagement element 42 as the window sash 2 is being moved towards its closed position.

In a first embodiment, shown in the figures 1, 2a and 2b, a first detent cut-out 414 is arranged in the locking plate 41. In a detent bolt support 314 in the mounting plate 31, a first detent element is secured, shown here as an axially movable detent bolt 44, also called a child barrier, arranged in such a way that as, in an active position, it projects from the mounting plate 31, it is accommodated by the first detent cut-out 414. An edge portion 414a of the first detent cut-out 414 arranged remotely from the locking-dog recess 412 of the locking plate 41 is arranged to abut against the projecting detent bolt 44 in such a way that the locking plate 41 is prevented from being rotated free from an

engagement with the engagement element 42. The detent bolt 44 is connected to the mounting plate 31 by a threaded

connection 441. An extended end portion 442 works as an end stop by its abutment against the mounting plate 31 or a portion of the window frame 1. In an outward-facing top surface 444 of the detent bolt 44 a groove 446 is provided, arranged to releasably receive an adjusting tool 447, shown here as an elongated groove 446 for a flat screwdriver 447.

In a second embodiment, shown in figures 3a, 3b and 4, the first detent element 44 is provided as a rotatably supported, but axially fixed, detent bolt. In this embodiment, the detent bolt 44 is provided with an eccentrically positioned abutment portion in the form of a detent pin 445 projecting from a top surface 444 of the detent bolt 44 into the first detent cut-out 414 of the locking plate 41. In this

embodiment, the first detent cut-out 414 is of such a shape that when the detent pin 445 has been rotated towards the window sash 2, the locking plate 41 can freely be rotated to be disengaged from the engagement element 42, whereas when the detent pin 445 has been rotated away from the window sash 2, it abuts against the locking plate 41, preventing it from being rotated for disengagement from the engagement element 42. In the outward-facing top surface 444 of the detent bolt 44, a groove 446 is provided, arranged to releasably receive an adjusting tool 447, shown here as an elongated groove 446 for a flat screwdriver 447 (see figure 2b) . The active position of the first detent element 44 is

indicated by A in the figures 2b and 3b, whereas the inactive position of the first detent element 44 is indicated by B in the figures 2a and 3a.

In the figures 5 and 6, a first embodiment of a wind

restrictor 43 is shown, shown here as a second detent element in the form of a pin. In this embodiment, the second detent element 43 is arranged in a second detent cut-out 415 in the locking plate 41, the detent element 43 projecting, axially fixed, up from the locking plate 41 in a direction away from the mounting plate 31, and being movable in the longitudinal direction of the second detent cut-out 415. The second detent cut-out 415 comprises a first slot portion 415a extending, when the child restrictor 4 is in function, approximately parallel to a side edge 322 of the first arm 32. The axial direction of the first slot portion 415a relative to the side edge 322 is preferably in the range of gently convergent to gently divergent, seen in the direction of the attachment of the first arm 32 to the mounting plate 31. The aim of this is to prevent the first arm 32, by its movement towards the wind restrictor 43, from pushing the wind restrictor 43 out of the first slot portion 415a. A second slot portion 415b extends in a direction away from the side edge 322. In the figures 5, 6 and 7, the slot 415 has the shape of an inverted J, but other shapes are also usable. When the wind restrictor 43 is in the second slot portion 415b, a closing movement of the window sash 2 will result in the first arm 32 pushing the wind restrictor 43 towards the bottom of the second slot portion 415b. The extent of the second slot portion 415b is such that the wind restrictor 43, in its inactive position B' , does not prevent the movement of the first arm 32.

In a second embodiment of the wind restrictor, as it is shown in the figures 7a, 7b and 9, the second detent element 43 is formed as an elongated element rotatably supported in the locking plate 41 and arranged to be rotated with a projecting end portion 431 into abutment against a side edge recess 323 in the first arm 32. By a closing movement of the window sash 2, the detent element 43 then prevents the window sash 2 from being pressed inwards from a ventilating position by the first arm 32 being prevented from being rotated into its closing position.

The active position of the second detent element 43 is indicated by A' in the figures 6 and 7a, whereas the inactive position of the second detent element 43 is indicated by B' in the figures 5 and 7b.

For pressure of the first arm 32 against the wind restrictor 43 not to result in the locking plate 41 being rotated into disengagement from the engagement element 42, the wind restrictor 43 is positioned in such a way in its active position that the movement of the first arm 32 towards the wind restrictor 43 makes the locking plate 41 maintain a locking connection relative to the engagement element 42; that is to say, is prevented from yielding to the pressure from the first arm 32 against the wind restrictor 43 when wind pressure is exerted on a window which is in a

ventilating position. In practice, this will result in the distance of the wind restrictor 43 from the centre of

rotation of the first arm 32 being smaller than the distance between the centre of rotation 313 of the second arm 33 (and thereby that of the locking plate 41) and the centre of rotation of the first arm 32.

Figure 8 shows the first embodiment of the child restrictor and the wind block described above combined. Figure 9 shows the second embodiment of the child restrictor and the wind block described above combined.