GB2576599A

GB2576599A - Drive for a door or window sash

Info

Publication number: GB2576599A
Application number: GB1908646.1A
Authority: GB
Inventors: Wörner Benjamin
Original assignee: Geze GmbH
Current assignee: Geze GmbH
Priority date: 2018-06-25
Filing date: 2019-06-17
Publication date: 2020-02-26
Anticipated expiration: 2039-06-17
Also published as: DE102018210296A1; DE102018210296B4; CN110630130A; GB201908646D0; CN110630130B; GB2576599B

Abstract

A drive, for a door or window closer, comprising a housing 12 with a cylinder (20, fig.1) in which a spring biased piston slides and divides the cylinder into fluid chambers. The housing includes a plurality of successive inlet/outlet bores/holes 24 through which hydraulic fluid flows; the bores/holes are offset both axially and circumferentially along the cylinder to be passed over and successively sealed or released by the piston as it slides. An adjustable valve orientated perpendicular to the cylinder bore is moved to control which inlet/outlet bores 24 are open thereby adjusting hydraulic functions of the drive, e.g. adjusting the stroke distance of the piston to account for different doors that open to larger angles like 160 degrees or 170 degrees, rather than 60 degrees or 70 degrees. The plurality of offset bores can be inclined in a straight line or a curve or two different angled straight lines.

Description

DRIVE FOR A DOOR OR WINDOW SASH

The invention relates to a drive for the sash of a door, a window or the like, having a housing and a piston-cylinder unit, whose piston, which is acted on by a spring unit and interacts with an output shaft, is slidably mounted in the cylinder of the piston-cylinder unit to form a pressure chamber and an unpressurised chamber, between which hydraulic medium can be transferred during a respective closing and opening movement of the piston.

Hydraulic drives for doors or windows are generally known and effect the selfclosing of the door or window sash, wherein in the case of a drive for a door sash or door closer both the movement of the door leaf into the door frame and the engagement of the latch of the door lock into the strike plate is guaranteed. In the housing, which is filled with a hydraulic medium, a mechanical energy storage device, particularly such as a spring unit, is also arranged, which is compressed by the displacement of the piston during a rotational movement of the output shaft as the sash is opened manually or, for example, automatically by a hydraulic pump, and acts as an energy storage device for the self-closing of the sash. The interior of the housing is divided into several chambers by the piston. Between these chambers, hydraulic channels having assigned regulating valves are arranged for influencing the overflow of the hydraulic medium, said valves serving to control the drive behaviour. In particular, a closing delay, opening damping, an end stop and/or the like may be provided.

A disadvantage of the hitherto usual drives, such as door closers in particular of the type mentioned at the outset, is, inter alia, that activation regions or application points for certain hydraulic functions such as a closing delay, opening damping, an end stop and/or the like are permanently predefined by design. Due to different installation situations, however, the fixed regions are frequently unsuitable. Thus, for example, the opening damping in the hitherto usual drives for door sashes usually begins at an opening angle of 60°, so that the door comes to halt before a door opening angle of 90°. However, if a door can be opened, for example, beyond a door opening angle of 180°, then the opening damping in the known drives is applied much too soon, making it difficult to walk through the door.

The object of the invention is to disclose a drive of the type mentioned at the outset in which the previously mentioned disadvantages have been eliminated. The aim in particular is to make the application points of hydraulic functions, such as and particularly damping ranges for a closing delay, opening damping and/or the like, and/or the application point of an end stop variably adjustable for increased convenience of use, in the simplest and most reliable manner.

The object is achieved according to the invention by a drive having the features of claim 1. Preferred embodiments of the drive according to the invention result from the dependent claims, the present description and the drawings.

The drive according to the invention for the sash of a door, a window or the like comprises a housing and a piston-cylinder unit, whose piston, which is acted on by a spring unit and interacts with an output shaft, is slidably mounted in the cylinder of the piston-cylinder unit to form a pressure chamber and an unpressurised chamber, between which hydraulic medium can be transferred during a respective closing and opening movement of the piston. In this case, the housing is provided with inlet and/or outlet bores for the overflowing hydraulic medium, which are offset relative to one another both along the axis and in the circumferential direction of the cylinder of the piston-cylinder unit and are successively passed over and sealed or released during a respective closing or opening movement of the piston of the piston-cylinder unit. In addition, a control valve is provided, having a valve member that is adjustable in a valve bore of the housing in the direction of the axis of the valve bore and in particular generally transversely to the cylinder of the piston-cylinder unit. The inlet and/or outlet bores of the housing open into the valve bore. In this case, the control valve interacts with the inlet or outlet bores provided in the housing such that, depending on the respective setting, different inlet and/or outlet bores of the housing can be sealed or released to allow the hydraulic medium to overflow via the valve bore of the control valve.

Due to the design according to the invention of the drive, the application points of hydraulic functions and particularly the damping ranges for a closing delay, opening damping and/or the like and/or the application point of an end stop are variably adjustable in a simple manner, whereby increased convenience of use of the door results for a drive for a door sash. The application points for the damping functions and the end stop are now individually adaptable to the surroundings. The drive or door closer is exposed to lesser loads. In addition, the variable adjustability of the hydraulic functions can be relatively easily implemented by design. If the piston of the piston-cylinder unit moves in the cylinder, hydraulic medium is displaced. In the process, the hydraulic medium flows through a particular housing inlet and/or outlet bore released by the control valve and piston of the piston-cylinder unit. In the flow direction of the hydraulic medium, throttle valves or the like can be arranged upstream or downstream of the control valve, the behaviour of the drive being controlled accordingly by means of said valves. As soon as the piston of the piston-cylinder unit has been displaced over a particular inlet and/or outlet bore set by the control valve, the inflow and outflow of the assigned throttle valve is interrupted.

Depending on the position of the control valve, different inlet and/or outlet bores in the housing are released. The piston of the piston-cylinder unit then requires more or less stroke until it seals or opens the released inlet and/or outlet bore. In the case of a drive for a door sash, a particular inlet and/or outlet bore is thus for ex ample released at a greater or lesser door opening angle. In this case, the application point of the relevant hydraulic function can be adjusted arbitrarily or variably.

Preferably, the valve bore of the control valve that is provided in the housing is in particular oriented at least substantially tangentially and transversely to the cylinder of the piston-cylinder unit in a region outside the piston-cylinder unit, and the valve member of the control valve is adjustable in the direction of the valve bore particularly by means of a thread, such as particularly a screw thread, by rotation about its axis that is coaxial with the axis of the valve bore of the control valve.

The inlet and/or outlet bores of the housing each expediently have an at least substantially circular cross section.

The inlet and/or outlet bores of the housing and thus the corresponding application points of a respective hydraulic function can be variably positioned.

According to an advantageous practical embodiment of the drive according to the invention, these inlet and/or outlet bores of the housing are arranged along a straight line inclined with respect to both the axis of the cylinder of the pistoncylinder unit and the axis of the valve bore. In this case, a linear setting behaviour is produced as the control valve is adjusted. The response behaviour of the drive can be controlled by means of the steepness of the straight line along which the inlet and/or outlet bores of the housing are arranged.

In this case, the inlet and/or outlet bores of the housing, which are arranged along a straight line inclined with respect to both the axis of the cylinder of the pistoncylinder unit and the axis of the valve bore, can be arranged at least partly at an equal distance from one another or at least partly at a different distance from one another.

According to an alternative advantageous embodiment of the drive according to the invention, the inlet and/or outlet bores of the housing are arranged at least partly along a curve or along at least two straight lines inclined at different angles with respect to the axis of the cylinder of the piston-cylinder unit and at different angles with respect to the axis of the valve bore.

In the latter case, the response behaviour of the drive can again be controlled by means of the steepness of the straight lines on which the inlet and/or outlet bores of the housing are arranged.

The inlet and/or outlet bores of the housing that are arranged at least partly along a curve and/or along at least two straight lines inclined at different angles with respect to the axis of the cylinder of the piston-cylinder unit and at different angles with respect to the axis of the valve bore can be arranged again at least partly at an equal distance from one another or at least partly at a different distance from one another.

Preferably, as a particular inlet and/or outlet bore of the housing is released by the control valve and the piston of the piston-cylinder unit, a hydraulic function, such as particularly a closing delay, opening damping, an end stop or the like, can be triggered.

In certain cases, it is also advantageous if the inlet and/or outlet bores of the housing are positioned so that they correspond to defined sash opening angles, in particular sash opening angles in the range of 60°, 70°, 160° and 170°.

Expediently, at least some of the inlet and/or outlet bores of the housing are assigned to different assembly types of the drive by being positioned accordingly. The drive is thus easily adaptable to different installation situations.

Preferably, the valve member of the control valve is provided with a valve head that interacts with the inlet and/or outlet bores of the housing and forms a close fit to the housing so that the hydraulic medium can only flow in or out via one inlet and/or outlet bore of the housing released in each case.

The valve head of the valve member of the control valve is preferably made of resilient plastics material. This ensures an optimal tight fit of the valve head of the valve member of the control valve to the housing.

The housing and the control valve are expediently provided with markings, by means of which the control valve can be positioned exactly in each of the various settings.

For a hydraulic function, such as particularly a closing delay or opening damping, preferably at least one throttle valve is provided upstream and/or downstream of the control valve in each case, when viewed in the flow direction of the hydraulic medium. In this case, the respective hydraulic function can be influenced accordingly particularly via such a throttle valve.

The valve member of the control valve may be provided advantageously with a tool holder for adjustment or rotation.

By means of the drive according to the invention, the application points of hydraulic functions, such as particularly the damping ranges for a closing delay, opening damping and/or the like and/or an end stop, are variably adjustable in a simple and reliable manner, whereby increased convenience of use is achieved in the case of a drive for a door sash or a door closer. The application points of a particular hydraulic function are individually adaptable to the surroundings. The drive or door closer is exposed to lesser loads. It is also easier to implement.

The invention is explained in more detail below on the basis of example embodiments and with reference to the drawings, in which:

Fig. 1	is a schematic partial sectional view - corresponding to a section transversely through the piston-cylinder unit and longitudinally through the control valve - of an example embodiment of a drive according to the invention, wherein hydraulic fluid can flow in or out via at least one inlet and/or outlet bore released by the control valve and piston,
Fig. 2	is a schematic partial sectional view - corresponding to a section in the longitudinal direction through the pistoncylinder unit and transversely through the control valve - of the drive according to Fig. 1, wherein the piston of the pistoncylinder unit is positioned outside the region of the inlet and/or outlet bores of the housing so that hydraulic medium can flow in and out via a particular inlet and/or outlet bore released by the control valve,
Fig. 3	is a schematic partial sectional view - corresponding to a section in the longitudinal direction through the pistoncylinder unit and transversely through the control valve - of the drive according to Fig. 1, the piston of the piston-cylinder unit sealing a part of the inlet and/or outlet bores of the housing including at least one inlet and/or outlet bore selected by the control valve,
Fig. 4	is a schematic partial sectional view - corresponding to a section along the piston-cylinder unit and longitudinally through the control valve - of an example embodiment of the

	drive according to the invention, wherein the inlet and/or outlet bores of the housing are arranged along a straight line inclined with respect to both the axis of the cylinder of the piston-cylinder unit and the axis of the valve bore, and one part of these inlet and/or outlet bores is released and one part sealed by the control valve,
Fig. 5	is an enlarged schematic partial sectional view - corresponding to a section along the piston-cylinder unit and longitudinally through the control valve - of a further example embodiment of the drive according to the invention, wherein the inlet and/or outlet bores of the housing are arranged along a straight line inclined with respect to both the axis of the cylinder of the piston-cylinder unit and the axis of the valve bore,
Fig. 6	is an enlarged schematic partial sectional view - corresponding to a section along the piston-cylinder unit and longitudinally through the control valve - of a further example embodiment of the drive according to the invention, in which the inlet and/or outlet bores of the housing are arranged again along a straight line inclined with respect to both the axis of the cylinder of the piston-cylinder unit and the axis of the valve bore, the straight line along which the inlet and/or outlet bores ofthe housing are arranged being inclined at a larger angle with respect to the axis of the cylinder of the pistoncylinder unit and at a smaller angle with respect to the axis of the valve bore than in the embodiment according to Fig. 5, and

Fig. 7 is an enlarged schematic partial sectional view corresponding to Fig. 6 of a further example embodiment of the drive according to the invention, in which the inlet and/or outlet bores of the housing are arranged along two straight lines inclined at different angles with respect to the axis of the cylinder of the piston-cylinder unit and at different angles with respect to the axis of the valve bore and the inlet and/or outlet bores arranged along one straight line are at a different distance from one another than the inlet and/or outlet bores arranged along the other straight line.

Fig. 1 to 7 show different example embodiments of a drive 10 for the sash of a door, a window or the like. In this case, the drive 10 in each case comprises a housing 12 and a piston-cylinder unit 14, whose piston 18, which is acted on by a spring unit 16 and interacts with an output shaft, is slidably mounted in the cylinder 20 of the piston-cylinder unit 14 to form a pressure chamber and an unpressurised chamber, between which hydraulic medium 22 can be transferred during a respective closing and/or opening movement of the piston 18.

In addition, in the case of a respective drive 10, the housing 12 is provided with inlet and/or outlet bores 24 for the hydraulic medium 22 to be transferred, which are offset relative to one another both along the axis and in the circumferential direction of the cylinder 20 of the piston-cylinder unit 14 and are successively passed over and sealed or released during a respective closing or opening movement of the piston 18 of the piston-cylinder unit 14, and a control valve 28 is provided, having a valve member 32 that is adjustable in a valve bore 30 of the housing 12 in the direction of the axis of the valve bore 20 and in particular generally transversely to the cylinder 20 of the piston-cylinder unit 14. In this case, the inlet and/or outlet bores 24 of the housing 12 open into the valve bore 30.

The control valve 28 interacts with the inlet or outlet bores 24 provided in the housing 12 such that, depending on the respective setting, different inlet and/or outlet bores 24 of the housing 12 can be sealed or released to allow the hydraulic medium 22 to overflow via the valve bore 20 of the control valve.

The valve bore 30 of the control valve 28 that is provided in the housing 12 is oriented in each case at least substantially tangentially and transversely to the cylinder 20 of the piston-cylinder unit 14 in a region outside the piston-cylinder unit 14. The valve member 32 of the control valve 28 is in each case in particular adjustable in the direction of the axis of the valve bore 20 by means of a screw thread 26 by rotation about its axis that is coaxial with the axis of the valve bore 30 of the control valve 28.

The inlet and/or outlet bores 24 of the housing 12 each have an at least substantially circular cross section in the present example embodiments. In principle, however, other cross-sectional shapes of the inlet and/or outlet bores 24 are also conceivable.

As can be seen in particular from Fig. 4 to 6, the inlet and/or outlet bores 24 of the housing 12 can be arranged along a straight line 36, 38 inclined with respect to both the axis of the cylinder 20 of the piston-cylinder unit 14 and the axis of the valve bore 20.

In this case, the inlet and/or outlet bores 24 of the housing, which are arranged along a straight line 36, 38 inclined with respect to both the axis of the cylinder 20 of the piston-cylinder unit 14 and the axis of the valve bore 20, can be arranged at least partly at an equal distance from one another or at least partly at a different distance from one another.

However, the inlet and/or outlet bores 24 of the housing 12 can also be arranged at least partly along a curve or along at least two straight lines inclined at different angles with respect to the axis of the cylinder 20 of the piston-cylinder unit 14 and at different angles with respect to the axis of the valve bore 20 (see in particular Fig. 7).

In this case, the inlet and/or outlet bores 24 of the housing 12 that are arranged along a curve and/or along at least two straight lines inclined at different angles with respect to the axis of the cylinder 20 of the piston-cylinder unit 14 and at different angles with respect to the axis of the valve bore 20 can be arranged again at least partly at an equal distance from one another or at least partly at a different distance from one another.

As a particular inlet and/or outlet bore 24 of the housing 12 is released by the control valve 28 and the piston 18 of the piston-cylinder unit 16, a hydraulic function, such as particularly a closing delay, opening damping, an end stop or the like, can be triggered in particular.

The inlet and/or outlet bores 24 ofthe housing 12 can be positioned so that they correspond to defined sash opening angles, in particular sash opening angles in the range of 60°, 70°, 160° and 170°. In principle, however, the inlet and/or outlet bores 24 of the housing 12 can also correspond to other defined sash opening angles by being positioned accordingly.

Embodiments of the drive 10 according to the invention in which at least some of the inlet and/or outlet bores 24 of the housing 12 are assigned to different assembly types of the drive by being positioned accordingly are also conceivable. The drive 10 is thus adaptable to different conditions caused by different assembly types.

As can be seen in particular from Fig. 1 and 4, the valve member 32 of the control valve 28 can be provided with a valve head 34 that interacts with the inlet and/or outlet bores 24 of the housing 12 and forms a close fit to the housing 12 so that the hydraulic medium 22 can only flow in or out via one inlet and/or outlet bore 24 of the housing 12 released in each case. In this case, the valve head 24 of the valve member 32 of the control valve 28 may be made in particular of resilient plastics material.

The housing 12 and the control valve 28 can be provided with markings, by means of which the control valve 28 can be positioned exactly in each of the different settings.

For a hydraulic function, such as particularly a closing delay or opening damping, at least one throttle valve can be provided upstream and/or downstream of the control valve 28 in each case, when viewed in the flow direction of the hydraulic medium 22.

The valve member 32 of the control valve 28 may be provided with a tool holder 42 for adjustment or rotation (see in particular Fig. 1 and 4). If this tool holder 42, as in the two cases shown, is slot-shaped, then it may simultaneously serve as a marker.

In the embodiment shown in Fig. 1, hydraulic medium 22 can flow in and out via at least one inlet and/or outlet bore 24 released by the control valve 28 and piston 18 of the piston-cylinder unit 14. In this case, the hydraulic medium 22 can flow in or out via the valve bore 30 and a bore 40 of the housing 12 connected thereto.

Fig. 2 shows the drive 10 in a phase in which the piston 18 of the piston-cylinder unit 14 is positioned outside the region of the inlet and/or outlet bores 24 of the housing 12 so that hydraulic medium 22 can flow in and out via one inlet and/or outlet bore 24 released by the control valve 28 in each case.

In contrast, Fig. 3 shows the drive 10 according to Fig. 1 in a phase in which the piston 18 of the piston-cylinder unit 14 seals at least one part of the inlet and/or outlet bores 24 of the housing 12 including at least one inlet and/or outlet bore 24 selected by the control valve 28.

In the example embodiment of the drive 10 according to the invention as shown in Fig. 4, the inlet and/or outlet bores 24 of the housing 12 are arranged along a straight line inclined with respect to both the axis of the cylinder of the pistoncylinder unit 14 (see also Fig. 1) and the axis of the valve bore 30, one part of these inlet and/or outlet bores 24 being released and another part sealed by the control valve 28.

In the further example embodiment of the drive 10 according to the invention as shown in Fig. 5, the inlet and/or outlet bores 24 of the housing 12 are arranged at a larger distance from one another along a straight line 36 inclined with respect to both the axis of the cylinder of the piston-cylinder unit 14 and with respect to the axis of the valve bore 30. In the present case, the inlet and/or outlet bores 24 are provided at least substantially at the same distance from one another. In principle, however, embodiments in which the inlet and/or outlet bores 24 are at least partly arranged at a different distance from one another are also conceivable (see in particular Fig. 7).

In the further example embodiment of the drive 10 according to the invention as shown in Fig. 6, the inlet and/or outlet bores 24 of the housing 12 are again arranged along a straight line 38 inclined with respect to both the axis of the cylinder of the piston-cylinder unit 14 and the axis of the valve bore 30, although in the present case the straight line 38 along which the inlet and/or outlet bores 24 of the housing 12 are arranged is inclined at a larger angle with respect to the axis of the cylinder of the piston-cylinder unit 14 and a smaller angle with respect to the axis of the valve bore 30 than in the embodiment according to Fig. 5. In the present case, the inlet and/or outlet bores 24 of the housing 12 are again at an at least substantially equal distance from one another, although these distances in the present case are smaller than those in the embodiment according to Fig. 5. In principle, however, embodiments in which the inlet and/or outlet bores 24 are at least partly arranged at a different distance from one another are again conceivable (see in particular Fig. 7).

Fig. 7 shows a further example embodiment of the drive 10 according to the invention, wherein in the present case the inlet and/or outlet bores 24 of the housing 12 are arranged along two straight lines inclined at different angles with respect to the axis of the cylinder of the piston-cylinder unit 14 and/or at different angles with re15 spect to the axis of the valve bore 30. In the present case, the inlet and/or outlet bores arranged along one straight line are, for example, arranged at a smaller distance from one another than the inlet and/or outlet bores arranged along the other straight line.

List of reference numerals

Drive

Housing

Piston-cylinder unit

Spring unit

Piston

Cylinder

Hydraulic medium

Inlet and/or outlet bore

Screw thread

Control valve

Valve bore

Valve member

Valve head

Straight line

Bore

Tool holder

Claims

1. A drive (10) for the sash of a door, a window or the like, comprising a housing (12) and a piston-cylinder unit (14), whose piston (18), which is acted on by a spring unit (16) and interacts with an output shaft, is slidably mounted in the cylinder (20) of the piston-cylinder unit (14) to form a pressure chamber and an unpressurised chamber, between which hydraulic medium (22) can be transferred during a respective closing and opening movement of the piston (18), wherein the housing (12) is provided with inlet and/or outlet bores (24) for the hydraulic medium (22) to be transferred, which are offset relative to one another both along the axis and in the circumferential direction of the cylinder (20) of the piston-cylinder unit (14) and are successively passed over and sealed or released during a respective closing or opening movement of the piston (18) of the piston-cylinder unit (14), and a control valve (28) is provided, having a valve member (32) that is adjustable in a valve bore (30) of the housing (12) in the direction of the axis of the valve bore (30) and in particular generally transversely to the cylinder (20) of the piston-cylinder unit (14), and wherein the inlet and/or outlet bores (24) of the housing (12) open into the valve bore (30) and the control valve (28) interacts with the inlet or outlet bores (24) provided in the housing (12) such that, depending on the respective setting, different inlet and/or outlet bores (24) of the housing (12) can be sealed or released to allow the hydraulic medium (22) to overflow via the valve bore (20) of the control valve (28).

2. The drive according to claim 1, characterised in that the valve bore (30) of the control valve (28) that is provided in the housing (12) is oriented at least substan tially tangentially and transversely to the cylinder (20) of the piston-cylinder unit (14) in a region outside the piston-cylinder unit (14), and the valve member (32) of the control valve (28) is adjustable in the direction of the axis of the valve bore (30) by rotation about its axis that is coaxial with the axis of the valve bore (20) of the control valve (28), particularly by means of a screw thread (26).

3. The drive according to claim 1 or 2, characterised in that the inlet and/or outlet bores (24) of the housing (12) each have an at least substantially circular cross section.

4. The drive according to at least one of the preceding claims, characterised in that the inlet and/or outlet bores (24) of the housing (12) are arranged along a straight line (36, 38) inclined with respect to the axis of the cylinder (20) of the piston-cylinder unit (14) and with respect to the axis of the valve bore (20).

5. The drive according to claim 4, characterised in that the inlet and/or outlet bores (24) of the housing (12) that are arranged along a straight line (36, 38) inclined with respect to both the axis of the cylinder (20) of the piston-cylinder unit (14) and the axis of the valve bore (20) are arranged at least partly at an equal distance from one another or at least partly at a different distance from one another.

6. The drive according to one of claims 1 to 3, characterised in that the inlet and/or outlet bores (24) of the housing (12) are arranged at least partly along a curve or along at least two straight lines inclined at different angles with respect to the axis of the cylinder (20) of the piston-cylinder unit (14) and at different angles with respect to the axis of the valve bore (20).

7. The drive according to claim 6, characterised in that the inlet and/or outlet bores (24) of the housing (12) that are arranged at least partly along a curve and/or along at least two straight lines inclined at different angles with respect to the axis of the cylinder (20) of the piston-cylinder unit (14) and at different angles with respect to the axis of the valve bore (20) are arranged at least partly at an equal distance from one another or at least partly at a different distance from one another.

8. The drive according to at least one of the preceding claims, characterised in that, as a particular inlet and/or outlet bore (24) of the housing (12) is released by the control valve (28) and the piston (18) of the piston-cylinder unit (16), a hydraulic function, such as particularly a closing delay, opening damping, an end stop or the like, can be triggered.

9. The drive according to at least one of the preceding claims, characterised in that the inlet and/or outlet bores (24) of the housing (12) are positioned so that they correspond to defined sash opening angles, in particular sash opening angles in the range of 60°, 70°, 160° and 170°.

10. The drive according to at least one of the preceding claims, characterised in that at least some of the inlet and/or outlet bores (24) of the housing (12) are assigned to different assembly types of the drive by being positioned accordingly.

11. The drive according to at least one of the preceding claims, characterised in that the valve member (32) of the control valve (28) is provided with a valve head (34) that interacts with the inlet and/or outlet bores (24) of the housing (12) and forms a close fit to the housing (12) so that the hydraulic medium (22) can only flow in or out via one inlet and/or outlet bore (24) of the housing (12) released in each case.

12. The drive according to at least one of the preceding claims, characterised in that the valve head (34) of the valve member (32) of the control valve (28) is made of resilient plastics material.

13. The drive according to at least one of the preceding claims, characterised in that the housing (12) and the control valve (28) are provided with markings, by means of which the control valve (28) can be positioned exactly in each of the different settings.

14. The drive according to at least one of the preceding claims, characterised in that for a hydraulic function, such as particularly a closing delay or opening damping, at least one throttle valve is provided upstream and/or downstream of the control valve (28) in each case, when viewed in the flow direction of the hydraulic medium (22).

15. The drive according to at least one of the preceding claims, characterised in that the valve member (32) of the control valve (28) is provided with a tool holder (42) for adjustment or rotation.