EP1835111B1 - Door actuating device, in particular for a revolving door - Google Patents

Abstract

The device has a drive unit (10) which is coupled with a door and is arranged in housing (11). A pressure compensating unit forms a support casing (16), which comprises a cylinder and a closure element, which is formed for the admission of the spring adjustment (15). The threaded spindle (17) is axially and rotationally fixed at the support casing. An elastic force accumulator (12) and the pressure compensating unit are carried out as an individual pre-assembled unit.

Description

The invention relates to a door operating device, in particular for a revolving door, with a drive unit, which is coupled to a door and is arranged in a housing, further comprising a spring energy accumulator, in which at least the energy required to perform the closing movement of the door can be stored and which at least a compression spring arranged under a spring bias, wherein the compression spring is adjustable by means of a threaded spindle designed with a spring adjustment, and further wherein a fluid system is provided which comprises a pressure compensation unit.

Such door actuation devices, which are also referred to as door drives or door closers, are well known. In particular, a distinction is made between door actuation devices which comprise an electrohydraulic unit in order to also allow the door to be opened via the door actuation device, whereas devices without an electrohydraulic drive merely control the kinematics of the door closing movement. In any case, fluid systems are provided in the door operating devices, which usually comprise a hydraulic oil, which acts on the piston arranged in the device, which are mechanically connected to the drive unit and influence the opening and / or closing movement and kinematics of the revolving door.

When opening the revolving door via an electro-hydraulic drive, an oil pressure is generated by this, which passes through oil lines, which are often integrated in the housing itself, in at least one pressure chamber. On a piston adjacent to the pressure chamber thus acts a force which sets the piston and thus the drive unit in motion to open the door. During the closing movement of the piston is moved back by the door movement, and the pressure oil flows out of the pressure chamber and passes back into the electro-hydraulic unit or in opening volumes, which are for example the back of the piston.

In the door actuation devices also spring force memory are available, which store the energy required for the closing movement of the door in the form of mechanical work. The storage of the mechanical work by means of at least one compression spring, which is stretched during the opening movement of the door, so that the closing movement of the door via a relaxation of the compression spring takes place. The return of the pressure oil from the pressure chambers is also effected by means of the stored energy in the spring energy storage. The devices can either be used in the door frame or even integrated in the door leaf itself. When using the devices in fire doors minimum closing moments of the doors must be achieved, depending on the width and weight of the doors. In this case, specifications are to be complied with, which relate for example to the availability of a mechanically stored energy in the door operating devices, so that a fire door executes an automatic closing of the door even in the event of a power failure and thus a failure of a possible control of the door operating device.

The EP 0 756 663 B1 discloses a door closer with a spring force adjustment, which comprises an adjusting sleeve and is formed so that in its inner region a cavity is present, wherein this further comprises a collar on which the compression spring can be supported by a support disk. In the region of the collar, a breakthrough is formed, which has a corresponding designed a driver geometric shape for the positive connection between the driver and the Adjustment sleeve makes possible. In this case, the driver dives according to the direction of movement through the opening in the cavity of the adjusting sleeve. At the same time, however, the driver is surrounded by the pressure spring, so that in the interior of the compression spring of the driver is placed. In order to change the spring force adjustment in the installed state, the driver is within a cap, which is arranged end in the housing of the door closing device, placed over a seal and for securing via a lock washer. The protruding from the cap end of the driver is accessible with a corresponding tool to initiate a rotational movement in the driver. Upon rotation of the spring adjustment up to the stop of a locking washer, which is arranged on an adjusting screw, it can lead to Verkontern, which is not controllable by an operator on the outside of the housing adjusting screw and may not be solved again. The operation of the spring adjustment is only possible via the adjusting screw, which end is arranged on the longitudinally formed housing of the door operating device. When setting up an electro-hydraulic actuator, an end-to-end operation of the spring adjustment is not possible since the electro-hydraulic unit is arranged on this end side on the housing.

From the DE 32 24 300 C2 a door closer with an adjustable closing force is known. This has at least one arranged in the closer housing, with one end supported on an adjustable plate compression spring and operable from outside the housing means for adjusting the plate. The plate is arranged on a rotatably mounted drivable threaded spindle, wherein the arranged on a threaded spindle spring plate is driven by a worm gear. The worm gear takes a considerable amount of space, since a tangentially arranged to the worm drive screw can not be integrated in a small space. Further points Also, this solution of a spring adjustment on a fixed stop, which can lead to Verkontern. In addition, the spring plate must be guided axially in order to avoid co-rotation of the spring plate with the threaded spindle.

In the known state of the art, therefore, the problem arises that the embodiments for spring adjustment take up a considerable amount of space, so that a slim-line design of a door operating device is not possible to integrate these preferably in a door leaf or generally installed in one place, where only a very limited space is available. Furthermore, there is the problem that during the adjustment of the spring via an axially moving and additionally rotating adjusting a stop is approached, in which it can come to a Verkontern of the adjusting element with the stop. Furthermore, stop edges may be provided in the housing, which are formed as diameter steps in the housing. These require a considerable manufacturing effort, with a stop in the compression direction of the compression spring is essential to avoid overload of the compression spring. Frequently, spring adjustments are provided, which are adjusted by an operating element, which is operable end by the longitudinally formed housing of the device by means of a tool. In the arrangement of an electro-hydraulic unit, which preferably takes place on the end side of the housing, a simultaneous arrangement of the operating elements of the spring adjustment is not possible. For this, the controls of the spring adjustment must be led out laterally on the housing, which is usually possible only over very space-consuming worm gears.

The door operating device can be further provided with an electro-hydraulic drive unit, which can be acted upon by a pressure oil pressure chambers to adjust arranged in the housing of the device axially movable piston such that the drive unit for Operation of the revolving door is operable. These electro-hydraulic drives are used in particular for performing the opening movement of the revolving door, wherein at the same time the compression spring of the spring force accumulator is hydraulically tensioned to perform a subsequent closing movement solely by the energy stored in the spring energy store. Often, the pistons, which are axially movable in the housings of the devices, are pressurized alternately, the oil being conducted via oil passages, which are preferably introduced in the housing itself. In any case, a pressure equalization unit is needed for a closed system because, as the temperature of the door operator increases due to the expansion of the oil, the oil pressure in the closed fluid system of the apparatus may increase sharply. Depending on the temperature, oil pressures can occur, which can even damage the housing. In this case, pressure equalization units have a volume accumulator which offers volumetric compliance, so that the volume accumulator can shrink when the oil expands, in order to avoid the mentioned pressure peaks.

From the DE 34 11 189 C2 an automatic door closer with a can be coupled with a door closer shaft is known, which is rotatable from a closed position in both directions and within the housing with a Hubkurvenscheibe form-fitting between rollers a longitudinally movable carriage, to which a memory forming a spring arrangement and the piston of a Attack hydraulic damping device and the interior of the door closer housing is divided into two separated by the piston pressure medium spaces through separate channels, each with a closable throttle valve to flow out of the pressure medium from the shrinking when closing the door pressure chamber and a piston disposed in the opening movement the door leaf also opening check valve are interconnected, the separate channels by one of the Piston displaceable spool are alternately lockable and releasable, and in each channel a pressure medium spaces, if necessary, connecting safety valve is connected, wherein the stroke position of the spool is adjustable with respect to the piston. In this case, the piston rod has a cavity serving as a storage cylinder, in which a pressure compensation piston is arranged, which is in the direction of the cavity of the piston under load of a compression spring. By means of this pressure compensation device, it is possible on the one hand to store pressure medium and, on the other hand, to keep this pressure medium in the pressure medium space having the pressure spring within certain limits. However, this embodiment of a pressure fluid reservoir requires a specially shaped and open end piston or a corresponding piston rod, so that this design of a pressure accumulator can not be used for other versions of the door actuator. In this case, external pressure compensation units are needed, which require as individual components increased assembly costs and corresponding space requirements.

DE 195 15 169 shows a door operating device, which comprises both a spring adjustment, which is operable at the end of the housing longitudinally formed, and a pressure compensation unit, which is arranged at the opposite end of the housing or on its longitudinal side.

It is the object of the present invention to provide a door operating device with a spring adjustment and with a pressure compensation unit, which occupies a small space and has a simple construction.

This object is achieved on the basis of a door operating device according to the preamble of claim 1 in conjunction with its characterizing features. Advantageous developments of the present invention are specified in the dependent claims.

The invention includes the technical teaching that the pressure compensation unit forms a support sleeve, which comprises at least one cylinder and a closure element, which is designed to receive the spring adjustment, and wherein the threaded spindle axially and rotationally fixed is arranged on the support sleeve, and the spring energy accumulator and the pressure compensation unit are designed as a single preassembled unit.

This solution has the advantage that a spring adjustment is provided with an integrated pressure compensation unit, which occupies a small space, and which makes possible due to the arranged on the support sleeve, fixed threaded spindle and this rotating Federverstellmutter or Federverstellhülse an adjustment of the spring preload. Thus, the support sleeve takes the function of receiving the spring adjustment in the housing true, and also serves as a pressure compensation unit, since the support sleeve is formed with a corresponding volume memory. This advantageous development of the invention offers a high integration density, since components of the spring adjustment at the same time form the components of a pressure compensation unit.

Advantageously, the support sleeve comprises a cylinder in which a piston is received axially movable, wherein the support sleeve further comprises a closure element to form a pressure compensation chamber. The pressure compensation chamber serves as a volume storage, wherein the chamber is formed from the interior of the cylinder, which is bounded on the one hand by the closure element and on the other hand is closed by the axially movable piston. If the oil now expands in the closed system of the door operating device, then the piston moves axially into the cylinder, so that the volume decreases. When the oil contracts again, the piston moves axially out of the cylinder again, increasing the volume of the pressure compensation chamber. The pressure compensation chamber is formed pressure-tight due to an all-round seal, so that upon movement of the piston into the cylinder through the resulting compression an increase in the internal pressure of the pressure compensation chamber he follows. This is usually filled with air, so that the air is compressed. In addition, there is a compression spring between the closure element and the piston, which is also compressed, and the piston can increase the volume in the cylinder again with a decrease in the pressure of the oil in the device, since the compression spring pushes the piston out of the cylinder again. The piston is sealed by means of at least one sealing element dynamically pressure-tight against the inner wall of the cylinder, wherein the sealing elements are preferably formed from two lip seals.

Advantageously, the closure element is disc-shaped and comprises an external thread, by means of which it can be screwed into the cylinder end of the support sleeve. On the outside in the closure element recesses are formed to screw this end by means of a screwing into the cylinder of the support sleeve. Advantageously, the cylinder of the support sleeve on the end side facing away from the closure element comprises an inner collar in order to create a stop for the piston. Overall, thus, a spring adjustment is provided with a pressure compensation unit, which occupies a small space, and which makes it possible due to the arranged on the support sleeve, fixed threaded spindle and rotating around this Federverstellmutter or Federverstellhülse an adjustment of the spring preload. This can be operated by means of an adjusting mechanism in the longitudinal direction of the side of the housing. The spring adjustment comprises a housing-fixed support sleeve, wherein the support sleeve is arranged both in the longitudinal direction of the device and in the rotational direction stationary to the housing, which for example has an external thread which is screwed into an internal thread in the housing.

At the pressure spring-side end face of the cylindrical support sleeve, a threaded spindle is arranged, which is fixed both in the longitudinal direction and in the direction of rotation. On the fixed threaded spindle is a Federverstellmutter screwed with an internal thread, wherein the adjusting nut is adjustable in the axial direction due to a rotation on the thread of the threaded spindle. The Federverstellmutter has a spring plate on which the compression spring rests end. Thus, due to a rotational movement of the Federverstellmutter the bias of the compression spring can be increased by the Federverstellmutter is rotated in the direction of the compression spring on the threaded spindle, wherein the spring tension can be reduced by the Federverstellmutter is adjusted in the direction of the support sleeve on the threaded spindle. The rotational movement, which is necessary for the axial adjustment of the spring adjustment, is introduced via a spring adjustment in the Federverstellmutter. The spring adjusting sleeve is arranged to be axially movable relative to the spring adjusting nut, wherein the rotational movement can be transmitted via a positive connection. Thus, the Federverstellhülse remain in an axially stationary position, the Federverstellmutter performs the axial movement. This arrangement allows the initiation of a rotational movement in a stationary, but rotating Federverstellhülse, wherein furthermore an axially fixed and rotationally fixed threaded spindle can also be arranged stationary.

As an advantageous embodiment of the invention it is provided that the positive connection between the Federverstellmutter and the Federverstellhülse comprises a uniform in the axial direction polygonal contour which is formed on the inside in the Federverstellhülse and on the outside of the Federverstellmutter, wherein the inside and the outside βenseitige polygon contour into each other is arranged joined to allow relative to each other rotationally fixed an axial movement. As a polygon contour, for example, a hexagon can be provided, wherein also a square, an octagon or any other polygon can be provided. Likewise, the application of a spline is possible, which can also transmit a torque, and at the same time between the nested components such as the spring adjusting nut and the spring adjustment sleeve allows axial movement. Alternative embodiments of the axially movable rotary joint can be seen in the application of sliding blocks or keyways, which may be designed in the sense of a shaft-hub connection.

An advantageous arrangement of the spring adjustment sleeve can be made possible by being axially fixed on the support sleeve and / or on the threaded spindle and the threaded spindle extending axially through the spring adjustment sleeve. The threaded spindle is screwed into the end of the support sleeve, and has a collar which between the end face of the support sleeve and the collar itself provides the formation of a cylindrical portion which is formed as a sliding bearing. The spring adjustment sleeve has a cylindrical inner portion which is placed on the cylinder portion of the threaded spindle. If the threaded spindle is now screwed into the support sleeve at the end, then the spring adjustment sleeve is axially fixed, and rotatably supported due to the sliding bearing arrangement. Thus, the Federverstellhülse is arranged coaxially with a portion of the threaded spindle, wherein the Federverstellmutter can dip into the Federverstellhülse. By means of this arrangement, a maximum utilization of the installation space is advantageously possible, wherein the threaded spindle extends at least in sections and depending on the set position in the compression spring.

As an advantageous development of the invention, it is proposed that a first gear is rotatably connected to the Federverstellhülse, via which the rotational movement is introduced into the Federverstellhülse. The first gear is engaged with a second gear, wherein the rotational planes of the gears occupy an angle of about 90 ° to each other. The first gear may be pressed onto the portion of the sliding bearing between the Federverstellhülse and the threaded spindle on the Federverstellhülse or also comprise a polygon, in order to arrange this against rotation of the Federverstellhülse. A second gear is arranged offset 90 ° to the first gear, wherein the angle describes the orthogonal to each other of the rotational planes of the gears. Thus, the rotational movement can be initiated from a direction perpendicular to the longitudinal axis of the door operating device and thus perpendicular to the longitudinal axis of the threaded spindle or the spring adjustment. Possible embodiments of the toothing may be a bevel gear, wherein also a crown gear can be provided. In this case, only the transmission of a rotational movement over an angle of 90 ° is required, so that any further toothing option in the context of the present invention is applicable.

The second gear is rotatably supported by a gear receptacle in the housing, which is positioned so that it is exactly in engagement with the first gear. The positioning can be realized for example via a diameter stage, to which the support sleeve abuts, wherein the first gear rests flat against the end face of the support sleeve. The gear receptacle for receiving the second gear in the housing is pressure-tight relative to the housing, wherein the seal is realized via O-rings. The gear receptacle can be screwed from the outside of the housing of the device, wherein the positioning can be provided to ensure an exact toothing via a stop collar, which is formed in the gear receptacle.

The gear receptacle in this case has a tool holder in order to initiate the rotational movement in the toothing and thus in the adjusting nut by means of a tool from the outside of the housing. The tool holder may comprise a hexagon socket, so that with an Allen key, the bias of the compression spring can be adjusted. The tool holder in the gear holder can flush with the outside of the housing of the door operator, so that no components protrude out of the device to ensure installation, for example, in a door leaf. When installing the door operating device in a door leaf, the tool holder, for example, upwards, so that an operator by means of a tool, the bias of the compression spring and thus the restoring torque which exerts the door operating device on the door leaf, can adjust by means of a tool from above. If the door operating device is installed, for example, in the frame of a door, then the tool holder can be arranged in the direction of the door leaf, so that the operator performs the adjustment upside down.

If the operator now initiates a rotary movement with a tool into the tool holder and thus into the gear holder, the second gear wheel is set in rotation. By engaging with the first gear, the rotational movement is transmitted through an angle of 90 ° to the longitudinal axis of the door operating device, so that the first gear receives the rotational movement. Due to the rotationally fixed arrangement of the first gear on the Federverstellhülse this is also rotated. Thus, the Federverstellhülse rotated on the fixed threaded spindle, wherein the Federverstellmutter is arranged coaxially in the Federverstellhülse. Due to the positive connection via a polygon between the Federverstellhülse and the Federverstellmutter now the rotational movement is transmitted to the Federverstellmutter, which performs an axial movement due to the Gewindindelaufs on the threaded spindle. Now runs the spring adjusting nut along the threaded spindle in the direction of the compression spring, the spring preload is increased, and the restoring torque which exerts the door operating device on the door leaf increases. If the rotational movement has a direction of rotation, so that the spring adjusting nut moves in the direction of the support sleeve, the spring preload decreases, which causes a lower restoring moment, which the door operating device on the door leaf exercises. Thus, it is possible to adjust by means of a simple adjustment, the restoring moment depending on the door size, in particular the door width and the door weight, so that the corresponding legal requirements (EN3 ... EN6) can be met. This is especially true when used for fire doors, where minimum restoring torques are given.

Advantageously, the threaded spindle comprises a spring adjustment stop, against which the spring adjusting nut abuts on the threaded spindle in the direction of the compression spring during a screwing movement and limits the screwing movement. The spring adjusting nut has an annular end surface which is attached to a formation which extends beyond the spring plate in the direction of the compression spring. Now, if the Federverstellmutter adjusted in the direction of the compression spring, abuts the annular end face of the Federverstellmutter to the spring adjustment stop when reaching the maximum adjustment. For design reasons, it is of particular advantage that the spring adjustment stop comprises a stop disc, which is accommodated on the threaded spindle. The stop disk has an axial clearance, wherein the axial play comprises about 0.1 mm to 1 mm, preferably about 0.3 mm to 0.8 mm and particularly preferably about 0.4 mm to 0.5 mm. The stop disc is placed on the threaded spindle and secured by a locknut. The said axial clearance thus arises between a collar on the threaded spindle, on which rests the axial disc and the lock nut.

In any case, the axial clearance is used so that the stop disc is rotatable, so that when abutting the Federverstellmutter to the stop plate no Verkontern can occur. The effective friction diameter between the stopper plate and the locknut is smaller than between the stopper plate and the annular end face of the Federverstellmutter, so that even with a very tight twisting against the Federverstellanschlag Anytime a release of the attack without much effort is possible. In particular, the stop in the direction of the spring compression occur relatively high forces, the operator receives no information about where the spring adjusting nut is located. Therefore, it can not come to a failure of the system by a verkonterungsfreies bracing the Federverstellmutter with the spring adjustment stop, because to adjust in Losdrehrichtung no force peak must be overcome, since the stop plate can rotate.

An advantageous embodiment of the locknut provides that this has a cylinder portion which allows centering of a pressure spring arranged in the second compression spring. The second compression spring is arranged coaxially with the first compression spring and serves to increase the maximum possible spring force on the drive unit. The second compression spring has an inner diameter which so fits over the cylinder portion, so that the spring is centered by the lock nut. At the end nut a hexagon is formed at the end, wherein between the spring stopper and the threaded portion of the threaded spindle also a hexagon is formed. When joining the threaded spindle in the end face of the support sleeve and the joining of the lock nut on a threaded end formed in the direction of the compression spring on the threaded spindle corresponding tools can be applied to verkontern about the hexagonal formations the lock nut with the threaded spindle and the threaded spindle in the support sleeve screw in firmly. The second compression spring is supported axially on the back of the stop plate, so that it fulfills both the function of a spring plate, and serves as a stop of the Federverstellmutter on the threaded spindle.

This arrangement thus allows a slipping-free and verkonterungsfreie spring adjustment without stops or anti-rotation in the Housing for the spring adjusting nut. The non-rotatable spindle takes over the counter moments of the thread friction and the release of the end stops instead of the housing.

Further, measures improving the invention are specified in the subclaims or will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS.

Fig. 1:

Eine quergeschnittene Seitenansicht einer Türbetätigungs-vorrichtung mit einer Federverstellung sowie einer Druckausgleichseinheit;

Fig. 2:

eine Darstellung der Einheit aus der Federverstellung und der Druckausgleichseinheit gemäß der vorliegenden Erfindung; und

Fig. 3:

eine perspektivische Ansicht der Einheit aus Fig. 2 in einem nicht montierten Zustand.

These show in

Fig. 1:

A cross-sectional side view of a door operating device with a spring adjustment and a pressure compensation unit;

Fig. 2:

a representation of the unit from the spring adjustment and the pressure compensation unit according to the present invention; and

3:

a perspective view of the unit Fig. 2 in a non-assembled state.

In Fig. 1 a door operating device 1 is shown, which is particularly suitable for a revolving door and can be installed for example in a door leaf or in a door frame. The door operating device 1 comprises a drive unit 10, which can be coupled to a door according to the present exemplary embodiment. The door operating device 1 consists of a housing 11 in which a spring energy accumulator 12 is arranged. The spring energy accumulator 12 allows the storage of energy in the form of a spring compression, which is stored by the compression of a compression spring 13 when the door is opened. Now, if the door is closed again, the spring energy storage 12 acts the drive unit 10 which is connected to the revolving door so that it performs a closing movement. The spring force accumulator 12 includes a spring adjustment 15, by means of which the biasing force in the compression spring 13 is adjustable. The spring adjustment 15 is constructed at least from a housing-fixed support sleeve 16, on which a fixed threaded spindle 17 is arranged. On the threaded spindle 17, a Federverstellmutter 18 is screwed, wherein the Federverstellmutter 18 can be adjusted by a Federverstellhülse 19. The Federverstellmutter 18 is rotatably connected to the Federverstellhülse 19 via a positive connection, so that they can indeed move axially to each other, but not rotate against each other.

The electrohydraulic drive 14 comprises a special electric motor and a hydraulic unit, which is selectively driven via a transmission by the motor. According to the embodiment of the door operating device 1, this has by means of the electro-hydraulic drive 14 the possibility to perform the opening movement of the revolving door automatically, during the opening movement, the revolving door is set in motion and the compression spring 13 due to an axially moving to the compression spring 13 adjacent piston 20th In addition, it is stretched. The opening movement of the revolving door is initiated via the pressurized pistons 20, 21, wherein the drive unit 10 comprises a cam-roller unit for converting the axial movement of the piston 20 and 21 into a rotational movement of a shaft 22. The said components are arranged inside the housing 11, so that the door operating device 1 can be installed in a plurality of revolving doors within the door leaves due to the narrow formation with a width of for example 40 mm. Thus, it is possible to integrate the door operating device invisible from the outside into the door. The pistons 20 and 21 are acted upon via respective adjacent pressure chambers with a hydraulic fluid, wherein the fluid pressure via the electro-hydraulic drive 14 is available is provided. The fluid connections may be in the form of channels which are integrated in the housing 11.

Fig. 2 and Fig. 3 show the view of the unit from the spring adjustment 15 and the pressure compensation unit 32, wherein these in Fig. 2 is shown cut in an assembled view and in Fig. 3 is shown as an exploded view in the disassembled state. The non-rotating, ie fixed components of the spring adjustment 15 include the support sleeve 16, the threaded spindle 17, and an end arranged in the direction of the compression spring stop plate 29, which is arranged by means of a lock nut 30 on the threaded spindle 17.

The rotating components of the spring adjustment 15, however, include the second gear 24, which is received in a gear receptacle 25, wherein the gear receptacle 25 receives in this rotating tool holder 27 to drive the second gear 24 by means of a tool. Furthermore, the rotating components include the first gear 23, which is rotationally connected to the Federverstellhülse 19. This has a hexagon socket, which is axially joined to the hexagon on the Federverstellmutter 18. The Federverstellmutter 18 includes an integrally formed spring plate 31, on which the compression spring 13 rests end side.

The support sleeve 16 is designed as a pressure compensation unit 32, which comprises a cylinder 33 in which a piston 34 is axially guided. To form a pressure compensation chamber 35, the pressure compensation unit 32 further comprises a closure element 36 which has a threaded bore into which the threaded spindle 17 can be screwed on the outside. Between the piston 34 and the closure element 36, a compression spring 37 is arranged, which moves the piston 34 in the unpressurized state of the fluidic system in a direction in which the pressure compensation chamber 35 is increased in volume. The piston 34 comprises sealing elements 38, which are designed according to the present embodiment as lip seals and are arranged twice radially in the lateral surface of the piston 34. With an increase in the pressure of the hydraulic fluid on the outside of the pressure compensation chamber 35, the piston 34 is moved in the direction of the pressure compensation chamber 35, so that the pressure in the air-filled pressure compensation chamber 35 increases, and at the same time reduces the volume. The extension movement of the piston 34 from the pressure compensation chamber 35 is limited by an inner collar 40 which is present on the cylinder 33 at the end. This inner collar 40 at the same time has a wrench size in order to use a corresponding tool when the closure element 36 is screwed to the cylinder 33. To screw the disc-shaped closure member 36, this has two recesses 39, in which a special tool can be used so as to apply the required torque for screwing tightly into the cylinder 33.

This ensures that the pressure in the closed system of the hydraulic fluid does not increase excessively during a temperature increase, since the pressure compensation chamber 35 fulfills the function of a hydraulic accumulator. Thus, with the spring adjustment 15 both the adjustment of the bias of the compression spring 13 is possible, as well as the integration of a pressure compensation unit 32 possible. Thus, two essential units of a door actuator as a structural unit are integrated with each other in such a way that it can be pre-assembled as a preassembled unit during assembly of the device.

LIST OF REFERENCE NUMBERS

1

Door actuator

10

drive unit

11

casing

12

Stored energy

13

compression spring

14

electrohydraulic drive

15

spring adjustment

16

support sleeve

17

screw

18

Federverstellmutter

19

Federverstellhülse

20

piston

21

piston

22

wave

23

first gear

24

second gear

25

gear receiving

26

Tool

27

tool holder

28

second compression spring

29

stop disc

30

locknut

31

spring plate

32

Pressure compensation unit

33

cylinder

34

piston

35

Pressure equalization chamber

36

closure element

37

compression spring

38

sealing element

39

deepening

40

inner collar

Claims (23)

1. A door actuating device (1), in particular for a swing door, with a drive unit (10), which can be coupled to a door and is disposed in a housing (11), furthermore comprising a spring energy accumulator (12), which stores at least the energy required to execute the closing movement of the door and which has at least one compression spring (13) disposed with a spring preload, and has a spring adjusting device (15) configured with a threaded spindle (17), wherein the compression spring (13) is adjustable by means of the spring adjusting device (15) and wherein furthermore a fluid system is provided, which comprises a pressure compensating unit,
   characterized in that
   the pressure compensating unit (32) forms a support sleeve (16), which comprises at least one cylinder (33) and a closure element (36), which is configured to receive the spring adjusting device (15), and wherein the threaded spindle (17) is disposed at the support sleeve (16) in an axially secured and torsion-resistant manner, and in that the spring energy accumulator (12) and the pressure compensating unit (32) are embodied as a single pre-mountable unit.
2. A door actuating device (1) according to claim 1, characterized in that the cylinder (33) is closed at its end side by means of the closure element (36).
3. A door actuating device (1) according to claim 1 or 2, characterized in that the threaded spindle (17) is screwed from outside into the closure element (36).
4. A door actuating device (1) according to claim 1 to 3, characterized in that the support sleeve (16) comprises a piston (34), which is disposed to be coaxially displaceable in the cylinder (33).
5. A door actuating device (1) according to claim 4, characterized in that a pressure compensating compartment (35) is configured in the cylinder (33) between the closure element (36) and the piston (34).
6. A door actuating device (1) according to claim 4 or 5, characterized in that another compression spring (37) is disposed between the piston (34) and the closure element (36).
7. A door actuating device (1) according to claim 5, characterized in that the piston (34) comprises at least one sealing element (38), in order to dynamically seal the pressure compensating compartment (35) pressure-tight with regard to the internal wall of the cylinder (33).
8. A door actuating device (1) according to any of the aforementioned claims, characterized in that the closure element (36) is configured disk-shaped and comprises a male thread, by means of which it can be screwed into the end side of the cylinder (33) of the support sleeve (16).
9. A door actuating device (1) according to any of the aforementioned claims, characterized in that depressions (39) are configured on the outside in the closure element (36), in order to screw the latter into the end side of the cylinder (33) of the support sleeve (16) by means of an assembly tool for screws.
10. A door actuating device (1) according to any of the aforementioned claims, characterized in that the cylinder (33) of the support sleeve (16) comprises an internal shoulder (40) at the end side facing away from the closure element (36), in order to provide an abutment for the piston (34).
11. A door actuating device (1) according to any of the aforementioned claims, characterized in that the spring adjusting device (15) comprises a spring adjusting nut (18) which can be screwed onto the threaded spindle (17).
12. A door actuating device (1) according to claim 11, characterized in that the spring adjusting nut (18) comprises a spring plate (31) on which the compression spring (31) rests with an end side.
13. A door actuating device (1) according to claim 11 or 12, characterized in that the rotational movement of the spring adjusting nut (18) on the threaded spindle (17) can be introduced into the spring adjusting nut (18) via a spring adjusting sleeve (19), wherein the spring adjusting nut (18) is disposed to be axially movable with regard to the spring adjusting sleeve (19) and wherein the rotational movement is transferable via a positive connection.
14. A door actuating device (1) according to claim 13, characterized in that the positive connection between the spring adjusting nut (18) and the spring adjusting sleeve (19) comprises a uniform polygon contour in axial direction, which is configured inside the spring adjusting sleeve (19) and outside the spring adjusting nut (18), wherein the inside and the outside polygon contours are disposed to be joined into one another, in order to allow for a rotationally fixed and axial movement in relation to each other.
15. A door actuating device (1) according to claim 13 or 14, characterized in that the spring adjusting sleeve (19) is disposed at the support sleeve (16) and/or the threaded spindle (17) to be axially fixed and rotatable, and in that the threaded spindle (17) extends axially through the spring adjusting sleeve (19).
16. A door actuating device (1) according to claim 13 to 15 characterized in that a first toothed wheel (23) is connected to the spring adjusting sleeve (19) in a torsion-resistant manner, via which wheel the rotational movement can be introduced into the spring adjusting sleeve (19), and in that the first toothed wheel (23) is in engagement with a second toothed wheel (24), wherein in particular the planes of rotation of the toothed wheels (23, 24) include an angle of approximately 90° with regard to each other.
17. A door actuating device (1) according to claim 16, characterized in that the second toothed wheel (24) is rotatably supported in the housing (11) by means of a toothed wheel reception (25).
18. A door actuating device (1) according to claim 17, characterized in that the toothed wheel reception (25) has a tool reception (27) in order to introduce the rotational movement into the toothing and therefore into the spring adjusting nut (18) by means of a tool from the outside of the housing (11).
19. A door actuating device (1) according to any of the aforementioned claims, characterized in that the threaded spindle (17) comprises a spring adjusting stop, against which the spring adjusting nut (18) abuts during a screwing movement on the threaded spindle (17) in the direction of the compression spring (13), and which stop delimits the screwing movement, and in that the spring adjusting stop comprises a stop washer (29) which is received on the threaded spindle (17).
20. A door actuating device (1) according to claim 19, characterized in that a counter-nut (30) can be screwed to the end side of the threaded spindle (17) in order to axially secure the stop washer (29).
21. A door actuating device (1) according to claim 19 or 20, characterized in that the stop washer (29) has an axial play, wherein the axial play comprises approximately 0.1 mm to 1 mm, preferably approximately 0.3 mm to 0.8 mm, and particularly preferred approximately 0.4 mm to 0.5 mm.
22. A door actuating device (1) according to claim 20 or 21, characterized in that the counter-nut (30) has a cylindrical section, which allows for centering a second compression spring (28), which is coaxially disposed in the compression spring (13).
23. A door actuating device (1) according to claim 22, characterized in that the second compression spring (28) is supported axially at the stop washer (29).

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