Device for keeping a door or window sash open

Abstract

Device (10) for holding open a leaf of a door, a window or the like, comprising a housing (12), a piston (14) arranged displaceably in the housing (12), and an axle (16) rotatably mounted in the housing (12) and cooperating with the piston (14), which axle can be coupled to a lever arrangement serving to transmit force between the leaf and a frame, wherein the piston (14) divides the housing (12) filled with a hydraulic medium into mutually opposite hydraulic chambers (18, 20), wherein at least one holding device (22) acting in the closing and / or opening direction is provided,which is exposed to the pressure generated in the respective hydraulic chamber (18) during a respective closing or opening movement of the piston (14) and prevents an overflow of the hydraulic medium between this hydraulic chamber (18) and the opposite hydraulic chamber (20) up to a predeterminable pressure for keeping the wing open and enables the release of the wing after this predeterminable pressure is exceeded, wherein a respective holding device (22) comprises a valve (24) with a valve member (28) held against a valve seat by a spring unit (26), and the valve (24) is designed such that it remains open after the predeterminable pressure is exceeded to release the wing until the hydraulic medium flow then flowing through the valve (24) is interrupted again, characterized inthat the piston (14) cooperating with the axis (16) is provided for a leaf that runs freely over the entire opening angle range without load and at least one holding device (22) acting in the closing and / or opening direction is provided.

Description

[0001] The present invention relates to a device for holding open a leaf of a door, window, or the like, comprising a housing, a piston slidably mounted in the housing, and a rotatable spindle mounted in the housing, interacting with the piston, which can be coupled to a lever arrangement serving to transmit force between the leaf and a frame. The leaf can, in particular, be a pivoting leaf. The lever arrangement can, for example, comprise a sliding arm guided in a slide rail or a rod assembly.

[0002] Hold-open devices of the type mentioned above are well known. Also known are dampers or door closers for revolving doors. These dampen the door leaf into the closed position, i.e., a position corresponding to a door opening angle of 0°. The dampened and correspondingly slowed retraction of the door leaf prevents damage, noise, etc.

[0003] A door locking device that can be used in particular for motor vehicles is known from DE 198 55 710 A1. DE 38 19 536 A1, EP 0 467 131 A1, DE 278 13 592 A1, and WO 2014 / 195463 A1 disclose door closers with holding or retracting devices.

[0004] However, conventional dampers, door closers, or similar devices generally don't allow the door to be left slightly open at a certain smaller opening angle, for example, to allow a gap for pets, to allow a slight influx of light, to ventilate, or similar purposes. Instead, the door is always closed completely.

[0005] If the hold-open device is intended, for example, for a free-running door without a damper, door closer or the like, the door leaf can be positioned at a smaller door opening angle, but it cannot be secured in the locked position, so that it is thrown open or closed, for example, by even a slight draft of air.

[0006] The invention is based on the object of providing a device for holding open a leaf of a door, window, or the like of the type mentioned above, which eliminates the aforementioned disadvantages. The device's design should be as simple as possible, ensuring not only that the leaf is held open or locked at a desired opening angle, but also that the leaf is securely held in the respective open position and released again in a defined manner.

[0007] The object is achieved according to the invention by a device having the features of claim 1. Preferred embodiments emerge from the subclaims, the present description and the drawing.

[0008] The device according to the invention for holding open a leaf of a door, window, or the like comprises a housing, a piston displaceably arranged in the housing, and a rotatable axle mounted in the housing, interacting with the piston, and coupled to a lever arrangement used to transmit force between the leaf and a frame. The piston divides the housing, filled with a hydraulic medium, into opposing hydraulic chambers. Furthermore, at least one holding device acting in the closing and / or opening direction is provided, which is exposed to the pressure generated in the respective hydraulic chamber during a respective closing or opening movement of the piston and prevents an overflow of the hydraulic medium between this hydraulic chamber and the opposite hydraulic chamber up to a predeterminable pressure for holding the leaf open. Once this predeterminable pressure is exceeded, it enables the leaf to be released.

[0009] This design, with its relatively simple construction, not only ensures that the sash is held open or locked at the desired opening angle, but is also held securely in its open position. Furthermore, it can be released again in a defined manner. The sash is automatically locked by preventing an overflow of hydraulic fluid from the hydraulic chamber, in which pressure builds up during each closing or opening movement, into the opposite hydraulic chamber of the sash. It can then be released again by actuating the sash with a specific contact force in the direction in which the holding device acts, thereby generating a higher pressure that exceeds the preset pressure.If the hold-open device is assigned to a door, for example, it can be securely held in the desired open position, allowing it to remain open even in the event of a slight draft or similar. Furthermore, the door can be securely held in the desired open position, for example, to keep a passageway clear for pets, to allow a slight influx of light, to allow for a little ventilation, for children, or for people in need of care, for example, so they can better hear what's happening outside.

[0010] According to a preferred practical embodiment of the device according to the invention, a respective holding device comprises a valve with a valve member held against a valve seat by a spring unit. This valve member is preferably designed such that, after the predeterminable pressure for releasing the vane is exceeded, it remains open until the hydraulic medium flow through the valve is interrupted again.

[0011] The valve can, for example, comprise a valve pin or the like that is spring-loaded against an opening and closes the opening as long as the pressure acting on the valve is lower than the predeterminable pressure, thereby holding or locking the wing in the respective open position. If the pressure acting on the valve exceeds the predeterminable pressure, the valve pin moves against the spring force acting on it, whereupon the hydraulic medium can overflow. Because the hydraulic medium is now flowing, the spring unit acting on the valve pin can no longer hold the valve pin against the opening, so that the wing is released. As already mentioned, the valve can advantageously be designed in particular so that the opening then remains open as long as hydraulic medium is flowing.The opening therefore only closes again when the leaf is stopped, which can be the case, for example, when the closed position or the maximum open position is reached. For this purpose, the valve can be provided, for example, with at least one outflow hole that is radially offset from the running surface of the valve pin. After the predefined pressure is exceeded, the hydraulic medium flows through the opening and the at least one outflow hole until the hydraulic medium flow stops, for example when the closed or maximum open position is reached. Only at this point in time can the spring unit acting on the valve pin press the valve pin or, via this, a ball or the like, against the opening again in order to close it and secure the leaf again.

[0012] As mentioned, the valve pin can hold a ball or similar object against the opening to block it. The trigger pressure at which the valve opens can be determined, in particular, by the spring force of the spring unit, which includes, for example, a compression spring, acting on the valve pin, and the diameter of the opening.

[0013] A preferred practical embodiment of the device, not claimed, is characterized in that the device for simultaneously forming a drive, in particular a door closer, comprises a spring unit acting on the piston, the housing is divided into a pressure chamber and a spring chamber by the spring-loaded piston and a holding device is provided which, at least at leaf opening angles which are smaller than a predeterminable opening angle, is exposed to the pressure arising in the pressure chamber and is thus activated in order to prevent an overflow of hydraulic medium from the pressure chamber into the spring chamber up to the predeterminable pressure or, after this predeterminable pressure has been exceeded, to enable this in particular by slightly pressing the leaf.

[0014] It is advantageous if the holding device can be activated, in particular by a corresponding control of overflow channels by the piston, at vane opening angles that are smaller than a predeterminable opening angle, and deactivated at vane opening angles that are larger than the predeterminable opening angle.

[0015] For sash opening angles that are larger than the preset opening angle, the respective sash movement is therefore not influenced by the holding device.

[0016] The hold-open device or a respective drive or door closer formed by it at the same time can in particular be designed in such a way that the piston has to displace hydraulic medium from the pressure chamber into the spring chamber in order to dampen the closing movement, wherein a throttle valve can be provided in the relevant overflow channel to regulate the flow of hydraulic medium.

[0017] The hold-open device can, for example, be designed such that the at least one holding device is activated only in an opening angle range of, for example, 0° to 30° or only in an opening angle range of, for example, 0° to 25°, and any other sash movement is otherwise not influenced by the holding device. In principle, however, any other opening angle ranges are also conceivable, in which the at least one holding device is deactivated or activated.

[0018] The retaining device can, for example, be located within the housing and define the respective pressure chamber between itself and the piston. However, if the piston is acted upon by a spring unit, it can also be advantageous in certain cases for the retaining device to be located within the spring chamber. Furthermore, designs in which a respective retaining device is integrated into a housing wall or housing cover are also conceivable.

[0019] According to a further preferred practical embodiment of the device, which is not claimed, the piston and the axis cooperating with it are designed in such a way that a freewheel is produced over at least one opening angle range, in which the axis is decoupled from the piston.

[0020] According to a preferred practical embodiment of the device, the piston and the axis cooperating therewith are designed, in particular to form a retraction damper, in such a way that freewheeling occurs at wing opening angles that are greater than a predeterminable opening angle and the piston and the axis are in engagement with one another at wing opening angles that are smaller than the predeterminable opening angle.

[0021] For wing opening angles that are larger than the specified opening angle, no hydraulic medium flows between the different hydraulic chambers.

[0022] During a corresponding freewheeling operation, in which the axis is decoupled from the piston, the respective holding device is deactivated. The predeterminable opening angle can be 30°, for example, although any other predeterminable opening angle is also conceivable, above which a freewheeling operation occurs. The shaft can, for example, be provided with drivers, each of which has a head surface with which it slides onto a piston-side toothing to form a respective freewheel. If the predeterminable opening angle is not reached, the shaft engages with the piston via a corresponding toothing or via drivers interacting with systems provided on the piston.In addition, when the preset opening angle is undershot, particularly through appropriate control of at least one overflow channel by the piston, the respective holding device is also activated. The hydraulic medium can only be displaced via the holding device again after the preset pressure has been exceeded, thus releasing the wing from the holding device. The wing thus remains open until the preset pressure is exceeded, for example, by gently pressing the wing.

[0023] If the axle or shaft has a cam contour instead of a driver, this can have a constant radius in the relevant area to form the freewheel. In contrast, the cam contour can have a sharply decreasing radius in the area where the axle re-engages the piston at opening angles smaller than the specified opening angle.

[0024] In the device according to the invention, the piston cooperating with the axis is unloaded for a wing that runs freely over the entire opening angle range and at least one holding device acting in the closing and / or opening direction is provided.

[0025] For example, only one holding device can be provided, which acts in particular by appropriately controlling overflow channels by the piston both in the closing direction and in the opening direction.

[0026] Alternatively, however, an embodiment of the device according to the invention is also conceivable in which two holding devices are provided, one of which acts in the closing direction and the other in the opening direction.

[0027] A respective holding device can be activated over the entire wing opening range or, according to an alternative exemplary embodiment, can be activated again in particular by a corresponding control of overflow channels by the piston in at least one wing opening angle and deactivated in the at least one other wing opening angle.

[0028] Accordingly, the hold-open device according to the invention can in particular also be designed such that the leaf can be held open in any desired position. The hold-open function can be active across the entire leaf opening range or only in specific areas. In the present embodiment for a freely running leaf, the at least one holding device can be effective both during opening and closing, or only during opening or closing. If, for example, the hold-open device is also designed for a door closer, the door leaf can be held in the opening direction by the spring unit acting on the piston. If a respective holding device is only intended to act in one direction, the hold-open device designed for a freely running leaf can, with regard to the hydraulic system, be designed at least substantially analogously to the previously described embodiments.The coupling between the axle and the piston can, for example, be realized via a toothing or an axle with a cam contour, similar to those used in a drive or door closer. As already mentioned, instead of just one holding device acting in both the opening and closing directions, two holding devices can also be provided, one acting in the closing direction and the other in the opening direction.

[0029] In principle, a respective holding device can be arranged both within the housing and integrated into a housing wall or a housing cover.

[0030] The hydraulic medium may in particular comprise a hydraulic fluid such as oil.

[0031] The invention is explained in more detail below using exemplary embodiments with reference to the drawing, in which: Fig. 1 a schematic representation of an exemplary embodiment of a hold-open device designed simultaneously as a drive and door closer, in which the holding device is only activated at leaf opening angles that are smaller than a predeterminable opening angle, Fig. 2 one with the embodiment according to Fig. 1 comparable exemplary embodiment of a holding-open device, in which the holding device is deactivated at wing opening angles greater than, for example, 30°, in that the hydraulic medium flow can flow past the holding device at the larger opening angles, wherein the piston assumes a position in which the holding device is deactivated due to a larger opening angle, Fig. 3 the holding device according to Fig. 2, however, the piston, due to a smaller opening angle, assumes a position in which the holding device is activated, Fig. 4 a schematic representation of an exemplary embodiment of a hold-open device designed simultaneously as a retraction damper with a freewheel, by means of which the holding device is deactivated at wing opening angles greater than, for example, 30°, wherein the piston assumes a position in which the holding device is deactivated due to a larger opening angle, Fig. 5 the holding-open device according to Fig. 4, however, due to a smaller opening angle, the piston assumes a position in which the holding device is activated, Fig. 6 a schematic representation of an exemplary embodiment of a holding-open device according to the invention for a wing which runs freely over the entire opening angle and whose piston is unloaded, ie not acted upon by a spring unit or the like, Fig. 7 is an enlarged schematic representation of an exemplary embodiment of a holding device, wherein the valve for preventing hydraulic medium from flowing out of the relevant hydraulic chamber is closed, Fig. 8 an enlarged view of the holding device according to Fig. 7, whereby the valve is, however, open to allow hydraulic fluid to drain from the relevant hydraulic chamber, Fig. 9 a schematic partial representation of a holding device according to Fig. 7 comparable slightly modified holding device, in which a seal with a sealing ring is provided instead of a ball, Fig. 10 is a schematic representation of an exemplary embodiment of a holding-open device in which the holding device is arranged in the spring chamber, and Fig. 11a) to d) are schematic representations of exemplary embodiments of the Fig. 11c) holding-open device according to the invention with a holding device integrated in a housing wall.

[0032] The Fig. 1 to 11 show exemplary embodiments of a, in Fig. 6, a device 10 according to the invention for holding open a leaf of a door, a window, or the like, wherein the various hold-open devices 10 each comprise a housing 12, a piston 14 displaceably arranged in the housing 12, and an axle 16 rotatably mounted in the housing 12, interacting with the piston 14, and can be coupled to a lever arrangement serving to transmit force between the leaf and a frame. The leaf can in particular be a pivoting leaf. The lever arrangement can, for example, comprise a lever arm guided in a slide rail or a rod assembly.

[0033] The housing 12 is filled with a hydraulic medium, in particular a hydraulic fluid such as oil, and is divided by the piston 14 into various hydraulic chambers 18, 20 on the two opposite sides of the piston 14. In addition, at least one holding device 22 is provided in each case, acting in the closing and / or opening direction, which is exposed to the pressure generated in the respective hydraulic chamber 18 during a respective closing or opening movement of the piston 14 and prevents an overflow of the hydraulic medium between this hydraulic chamber 18 and the opposite hydraulic chamber 20 up to a predeterminable pressure to keep the wing open and, after this predeterminable pressure is exceeded, enables the wing to be released, for example by lightly pressing.

[0034] As in particular the Fig. 7 and Fig. 8, a respective holding device 22 can comprise, for example, a valve 24 with a valve member 28 held against a valve seat by a spring unit 26. In this case, the valve 24 can in particular be designed such that, after the predeterminable pressure for releasing the wing has been exceeded, it remains open until the hydraulic medium flow then flowing through the valve 24 is interrupted again.

[0035] As already mentioned, the valve 24 can be designed in particular so that the opening 30 subsequently remains open as long as hydraulic medium is flowing. The opening 30 thus only closes again when the vane is stopped, which can be the case, for example, when the closed position or the maximum opening position is reached. For this purpose, the valve 24 can, for example, be provided with at least one discharge bore 32 radially offset from the running surface of the valve member 28 or valve pin.

[0036] After the preset pressure is exceeded, the hydraulic medium flows through the opening 30 and the at least one discharge bore 32 until the hydraulic medium flow stops, for example, upon reaching the closed or maximum open position. Only at this point can the spring unit 26, which acts on the valve member 28 or the valve pin, press the valve pin and, with it, for example, a ball 34 or the like, against the opening 30 again to close it and re-lock the wing.

[0037] As mentioned, the valve member 28 or the valve pin can hold, for example, a ball 34 or the like against the opening 30 in order to block it (cf. in particular again the Fig. 7 and Fig. 8). The trigger pressure at which the valve 24 opens can be determined in particular via the spring force of the spring unit 26, which comprises, for example, a compression spring and acts on the valve member 28 or the valve pin, and the diameter of the opening 30.

[0038] As in the Fig. 9, a respective holding device 22 can, however, instead of a ball, also be provided with a seal 36 with a sealing ring.

[0039] As in particular the Fig. 1 to 3, the hold-open device 10 can also comprise a spring unit 38 which acts on the piston 14 to simultaneously form a drive, in particular a door closer or the like. The housing 12 is divided into a pressure chamber 18 and a spring chamber 20 by the spring-loaded piston 14. In this case, for example, a holding device 22 is also provided which, at least at leaf opening angles which are smaller than a predeterminable opening angle, is exposed to the pressure generated in the pressure chamber 18 and is thus activated in order to prevent an overflow of hydraulic medium from the pressure chamber 18 into the spring chamber 20 up to the predeterminable pressure or, after this predeterminable pressure has been exceeded, to enable this, for example by gently pressing the leaf.

[0040] In this case, a respective holding device 22 can be activated, in particular by a corresponding control of at least one overflow channel by the piston 14, at vane opening angles that are smaller than a predeterminable opening angle and deactivated at vane opening angles that are larger than the predeterminable opening angle.

[0041] For wing opening angles that are greater than the predeterminable opening angle, a respective wing movement is therefore not influenced by the holding device 22.

[0042] As in particular the Fig. 1 to 3, the hold-open device 10 or a respective drive, door closer or the like formed simultaneously by it can be designed in particular such that the piston 14 has to displace hydraulic medium from the pressure chamber 18 into the spring chamber 20 in order to dampen the closing movement, wherein a throttle valve can be provided in the relevant overflow channel 40 to regulate the flow of hydraulic medium. The hold-open device 10 can, for example, be designed such that the at least one holding device 22 is only activated in an opening angle range of, for example, 0° to 30° or only in an opening angle range of, for example, 0° to 25° and a respective leaf movement is otherwise not influenced by the holding device 22. In principle, however, any other opening angle ranges are also conceivable in which the at least one holding device 22 is deactivated or activated.

[0043] In the Fig. 1 to 8 and 10, the holding device 22 is arranged within the housing 12, wherein in the embodiments according to the Fig. 1 to 5, the pressure chamber 18 acting on the holding device 22 is limited by the holding device 22 and the piston 14, while, for example, according to the Fig. 10, the holding device 22 arranged in the spring chamber 20 is connected to the respective pressure chamber 18 via an overflow channel 40. The respective holding device 22 can thus also be arranged in the spring chamber 20. However, embodiments are also conceivable, for example, in which the respective holding device 22 is arranged in a housing wall (cf. in particular the Fig. 11a) and Fig. 11b) or in a housing cover 46 (see in particular the Fig. 11c) and 11d) are integrated.

[0044] The piston 14 and the axis 16 cooperating with it can, for example, also be designed in such a way that a freewheel is produced over at least one opening angle range, in which the axis 16 is decoupled from the piston 14.

[0045] In this case, as can be seen in particular from the Fig. 4 and Fig. 5, the piston 14 and the axis 16 cooperating with it can be designed, for example to form a retraction damper, in such a way that a freewheel is produced at wing opening angles which are greater than a predeterminable opening angle and the piston 14 and the axis 16 are in engagement with one another at wing opening angles which are smaller than the predeterminable opening angle.

[0046] At wing opening angles that are greater than the preset opening angle, no hydraulic medium flows between the various hydraulic chambers 18, 20. During a corresponding freewheel, in which the axis 16 is decoupled from the piston 14, the respective holding device 22 is deactivated.

[0047] The preset opening angle can be 30°, for example, although any other preset opening angles are also conceivable, from which freewheeling occurs.

[0048] The axle 16 can, for example, be provided with drivers 42, each having a head surface with which they slide onto a piston-side toothing 44 to form a respective freewheel. When the predeterminable opening angle is undershot, the axle 16 engages with the piston 14 via a corresponding toothing or via drivers 42 interacting with systems provided on the piston 14. In addition, when the predeterminable opening angle is undershot, in particular by a corresponding control of at least one overflow channel 40 by the piston 14, the respective holding device 22 is also activated. In this case, the hydraulic medium can only be displaced again via the holding device 22 after the predeterminable pressure has been exceeded in each case, in order to release the vane from the holding device 22.The wing remains open until the preset pressure is exceeded, for example by lightly pressing the wing, and the hydraulic medium then flows out via the holding device 22.

[0049] If the axis 16 has, for example, a cam contour instead of the drivers 42 (cf. in particular the Fig. 10 and Fig. 11), it can have a constant radius in a particular area to form the freewheel. In contrast, the cam contour can have a sharply decreasing radius in the area where the axis b16 is again in engagement with the piston 14 at opening angles that are smaller than the predeterminable opening angle.

[0050] Fig. 6 shows an exemplary embodiment of a hold-open device 10 according to the invention, in which the piston 14 cooperating with the axis 16 for a wing running freely over the entire opening angle range is unloaded, ie not acted upon by a spring unit or the like, and at least one holding device 22 acting in the closing and / or opening direction is provided.

[0051] For example, only one holding device 22 may be provided, which acts in both the closing and opening directions, particularly through appropriate control of overflow channels 40 by the piston 14. Alternatively, however, two holding devices 22 may be provided, one acting in the closing direction and the other in the opening direction.

[0052] A respective holding device 22 can be activated over the entire wing opening range or, in particular, by a corresponding control of overflow channels 40 by the piston 14, can be activated in at least one wing opening angle range and deactivated in the at least one other wing opening angle range.

[0053] Consequently, the holding-open device 10 according to the invention can also be designed in such a way that the wing can be held open at any position (cf. in particular again the Fig. 6). In principle, however, the stay-open function can be active across the entire sash opening range or only in certain areas.

[0054] In the present design for a free-running wing according to Fig. 6, one holding device 22 is effective during both opening and closing. However, designs are also conceivable in which the holding device 22 is effective only during opening or closing.

[0055] If the hold-open device 10 is also designed as a door closer, for example, the leaf can be held in the opening direction by the spring unit 38 acting on the piston 14. If a respective holding device 22 is intended to act only in one direction, the hold-open device 10 designed for a free-running leaf can be designed, with regard to the hydraulic system, at least essentially analogous to the previously described embodiments.

[0056] The coupling between the axis 16 and the piston 14 can, for example, again be effected via a toothing or an axis 16 provided with a cam contour (cf. in particular again the Fig. 10 and Fig. 11) can be implemented, for example, analogously to that of the previously described drive or door closer.

[0057] In the Fig. 6, the arrows indicate the flow direction of the hydraulic medium in the respective overflow channels 40, each of which is provided with a check valve. Fig. 6 illustrated embodiment with only a single holding device 22, which acts both in the closing direction and in the opening direction, the hydraulic medium flows through the holding device 22 in the same direction during opening and closing.

[0058] As already mentioned, instead of just one holding device 22 acting in both the opening direction and the closing direction, two holding devices can also be provided, one of which acts in the closing direction and the other in the opening direction.

[0059] As already explained, a respective holding device 22 can be arranged within the housing 12 (see in particular the Fig. 1 to 8 and 10) or in a housing wall (see in particular the Fig. 11a) and Fig. 11 b)) or a housing cover 46 (see in particular the Fig. 11c) and 11d)) must be integrated.

[0060] Fig. 1 shows a hold-open device 10 that functions simultaneously as a drive or door closer, in which the holding device 22 is only activated at leaf opening angles that are smaller than a predefined opening angle. Fig. 2 is a device with the embodiment according to Fig. 1 shows a comparable embodiment of a holding-open device 10, in which the holding device 22 is deactivated at wing opening angles greater than, for example, 30°, in that the hydraulic medium flow can flow past the holding device 22 at the larger opening angles, wherein the piston 14 assumes a position in which the holding device 22 is deactivated due to a larger opening angle. Fig. 3 shows again the holding-open device 10 according to Fig. 2, wherein the piston 14, due to a smaller opening angle, however, assumes a position in which the holding device 22 is activated.

[0061] Fig. 4 shows a hold-open device 10, which is designed, for example, at the same time as a retraction damper, with a freewheel, by means of which the holding device 22 is deactivated at wing opening angles which are greater than, for example, 30°, wherein the piston assumes a position in which the holding device is deactivated due to a larger opening angle. Fig. 5 shows again the holding-open device 10 according to Fig. 4, wherein the piston 14, however, due to a smaller opening angle, assumes a position in which the holding device 22 is activated.

[0062] Fig. 6 shows a hold-open device 10 according to the invention for a wing which runs freely over the entire opening angle range, the piston 14 of which is unloaded, ie not acted upon by a spring unit or the like.

[0063] In the Fig. 7 shows an enlarged view of an exemplary holding device 22 for a hold-open device 10 according to the invention, wherein the valve 24 is closed to prevent hydraulic medium from flowing out of the relevant hydraulic chamber 18. Fig. 8 shows again the holding device 22 according to Fig. 7, wherein the valve 24 is, however, open for the outflow of hydraulic medium from the respective hydraulic chamber 18.

[0064] In Fig. 9 is a holding device according to Fig. 7 shows a comparable, slightly modified holding device 22, in which a seal 36 with a sealing ring is provided instead of a ball 34.

[0065] Fig. 10 shows an exemplary embodiment of the hold-open device 10, in which the holding device 22 is arranged in the spring chamber 20 and the axis 16 is provided with a cam 48.

[0066] The Fig. 11a) to 11d) show exemplary embodiments of a Fig. 11c) according to the invention, holding-open device 10 with a housing wall (see Fig. 11a) and Fig. 11 b)) or in a housing cover 46 (see the Fig. 11c) and 11d)) integrated holding device 22. Here too, the axis 16 is again provided with a cam 48.

[0067] Due to the inventive design of the hold-open device 10, it is not only ensured that the sash is held open or locked at a desired opening angle, the sash is also held securely in the respective open position and released again in a defined manner. List of reference symbols 10 Hold-open device 12 housings 14 pistons 16 Axis 18 Hydraulic room, pressure room 20 Hydraulic chamber, spring chamber 22 Holding device 24 valve 26 Spring unit 28 valve element 30 Opening 32 outflow hole 34 balls 36 Seal with sealing ring 36 spring unit 40 overflow channel 42 drivers 44 piston-side toothing 46 Housing cover 48 cams

Claims

[1] Device (10) for holding open a leaf of a door, a window or the like, with a housing (12), a piston (14) arranged displaceably in the housing (12) and an axis (16) which is rotatably mounted in the housing (12) and interacts with the piston (14), the axis being adapted to be coupled to a lever arrangement which transmits force between the leaf and a frame, the piston (14) dividing the housing (12) which is filled with a hydraulic medium into mutually opposite hydraulic chambers (18, 20), at least one holding device (22) being provided which acts in the closing and / or opening direction and which corresponds to the hydraulic chambers (18, 20) which are acted upon during a respective closing or opening movement.opening movement of the piston (14) in the respective hydraulic chamber (18) is exposed to the pressure arising and prevents an overflow of the hydraulic medium between this hydraulic chamber (18) and the opposite hydraulic chamber (20) up to a predeterminable pressure for keeping the wing open and enables the release of the wing after this predeterminable pressure is exceeded, wherein a respective holding device (22) comprises a valve (24) with a valve member (28) held against a valve seat by a spring unit (26), and the valve (24) is designed such that it remains open after the predeterminable pressure is exceeded in order to release the wing until the hydraulic medium flow then flowing through the valve (24) is interrupted again. characterized bythat the piston (14) cooperating with the axis (16) is provided for a wing which runs freely over the entire opening angle range without load and at least one holding device (22) acting in the closing and / or opening direction. [2] Device according to claim 1, characterized by that only one holding device (22) is provided, which acts in particular by a corresponding control of overflow channels (40) by the piston (14) both in the closing direction and in the opening direction. [3] Device according to claim 1, characterized by that two holding devices (22) are provided, one of which acts in the closing direction and the other in the opening direction. [4] Device according to one of claims 1 to 3, characterized by that a respective holding device (22) is activated over the entire wing opening range. [5] Device according to one of claims 1 to 3, characterized bythat a respective holding device (22) is activated in at least one wing opening angle range, in particular by a corresponding control of overflow channels (40) by the piston (14), and is deactivated in the at least one other wing opening angle range. [6] Device according to at least one of the preceding claims, characterized by that at least one respective holding device (22) is arranged within the housing (12). [7] Device according to one of claims 1 to 5, characterized by that at least one respective holding device (22) is integrated in a housing wall or a housing cover.

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