EP3235985A1 - Door drive - Google Patents

Abstract

Described and illustrated is a door drive (1) with an output shaft (2) for coupling the door drive (1) with a power transmission element (3). A door drive (1), which is easily adaptable to different mounting positions, according to the invention realized in that the output shaft (2) comprises a hollow shaft (4) and a shaft insert (5), wherein the shaft insert (5) in the hollow shaft (4). can be used, wherein the shaft insert (5) at least a first clamping element (6a) and at least a second clamping element (6b), wherein the clamping elements (6a, 6b) of the shaft insert (5) by relative displacement in the direction of the axis of rotation of the hollow shaft (4) from a first spatial arrangement in a second spatial arrangement can be brought, wherein the shaft insert (5) in the first spatial arrangement in the hollow shaft (4) is movable and the shaft insert (5) in the second spatial arrangement in the hollow shaft (4) is fixed force and / or positive fit, wherein the first clamping element and / or the second clamping elements (6a, 6b) in the second spatial arrangement in a direction transverse to the Ro tion axis of the hollow shaft are spread.

Description

The invention relates to a door drive with an output shaft for coupling the door drive with a power transmission element. The invention further relates to a method for mounting a door drive.

For door drives there is the problem that the door drive must be adapted to different mounting positions. In particular, the vertical distance between the lintel and the mounted door drive can assume different values depending on the mounting condition. So that a variant of the door drive can be operated in different assembly positions, it is known from the prior art to extend the output shaft of the door drive with an extension element if necessary. In this case, the length of the extension element is usually chosen so that the force transmission element, which is usually formed by a linkage and is secured to the door drive spaced end of the extension element, is arranged substantially horizontally. The disadvantage here is that the extension element held in several different lengths and when mounting the door drive an extension element must be selected with the required length. Alternatively, an extension element of great length can be provided, wherein the extension element during assembly of the door drive, for example by sawing, must first be brought to the required length, which is just as disadvantageous.

Thus, it is the object of the invention to provide a door drive, which is easily adaptable to different mounting positions. In particular, it is the object of the invention to provide a door drive, which is flexibly adaptable with a length-adjustable output shaft to different mounting positions, in particular, the connection between the output shaft and power transmission element is free of play. Furthermore, it is the object of the invention to provide a method for mounting a door drive, which allows the installation of a door drive in a simple manner.

The previously derived and indicated object is achieved on the basis of the door drive described above in that the output shaft comprises a hollow shaft and a shaft insert, wherein the shaft insert is insertable into the hollow shaft, wherein the shaft insert has at least a first clamping element and at least one second clamping element, wherein the clamping elements of the shaft insert by relative displacement in the direction of the axis of rotation of the hollow shaft to each other from a first spatial arrangement in a second spatial arrangement can be brought, wherein the shaft insert in the first spatial arrangement in the hollow shaft is movable and the shaft insert in the second spatial arrangement in the hollow shaft is fixed force and / or positive fit, wherein the first clamping element and / or the second clamping elements are spread in the second spatial arrangement in a direction transverse to the axis of rotation of the hollow shaft.

As a result, on the one hand, on the one hand, the door drive can be easily adapted to different mounting positions. Furthermore, this can be the other way achieve a backlash-free connection between the shaft insert and the hollow shaft in a particularly simple and cost-effective manner, so that a power transmission from the door drive via a power transmission element on the door to be driven is also possible free of play.

Furthermore, it can be provided that, in the second spatial arrangement, the first clamping element dips into the second clamping element and / or the second clamping element into the first clamping element.

Furthermore, it can be provided that at least one of the clamping elements has a particular wedge-shaped recess and the other clamping element in the second spatial arrangement, the legs of the particular wedge-shaped recess in a direction transverse to the axis of rotation of the hollow shaft spreads.

Furthermore, it can be provided that the modulus of elasticity of the first clamping element is between 5 GPa and 1000 GPa, preferably between 10 GPa and 500 GPa, and particularly preferably between 20 GPa and 250 GPa. Here, GPa stands for the unit "Gigapascal", where a Gigapascal corresponds to 10 ⁹ Pascals. This ensures that the shaft insert is particularly secure in the hollow shaft fixable. Furthermore, it can be provided that the modulus of elasticity of the second clamping element is between 5 GPa and 1000 GPa, preferably between 10 GPa and 500 GPa, and particularly preferably between 20 GPa and 250 GPa. This ensures that the shaft insert is particularly secure in the hollow shaft fixable.

Furthermore, it can be provided that the moduli of elasticity of the first clamping element and the second clamping element differ by not more than 50%, preferably by not more than 20%, particularly preferably by not more than 10%. This ensures that the shaft insert is particularly secure in the hollow shaft fixable. Advantageous developments of the invention are specified in the dependent claims, the description and in the figures.

The power transmission element may preferably have a scissor linkage or a slide rail linkage.

Furthermore, it can be provided that the clamping elements of the shaft insert by relative displacement in the direction of the axis of rotation of the hollow shaft to each other from the second spatial arrangement in the first spatial arrangement can be brought. This ensures that the fixation of the shaft insert in the hollow shaft is reversible. Thus, the shaft insert can be moved in the hollow shaft or removed from the hollow shaft as needed, for example, for maintenance or repair.

Furthermore, it can be provided that the shaft insert in the hollow shaft is continuously displaceable when the clamping elements in the first spatial arrangement are located. This ensures that the length of the protruding from the hollow shaft portion of the shaft insert is extremely flexible adjustable to different lengths.

Furthermore, it can be provided that the shaft insert has a length of at least 40 mm, preferably at least 50 mm and particularly preferably at least 70 mm. This ensures that the door drive is also suitable for mounting positions that require a relatively long extension of the shaft.

Furthermore, it can be provided that the shaft insert has a first engagement element, in particular with an attack for a tool, wherein by an adjustment of the engagement element, the clamping elements from the first spatial arrangement can be brought into the second spatial arrangement, wherein the first engagement element in particular by a Screw, preferably an expansion screw is formed. This ensures that the adjustment of the engagement element, the clamping elements from the first spatial arrangement in the second spatial arrangement is possible in a simple manner.

Furthermore, it can be provided that the shaft insert has a second engagement element, in particular with an attack for a tool, wherein by an adjustment of the engagement element, the clamping elements from the second spatial arrangement in the first spatial arrangement can be moved, wherein the second engagement element in particular by a Screw, preferably an expansion screw is formed. This ensures that the adjustment of the engagement element, the clamping elements from the second spatial arrangement in the first spatial arrangement is possible in a simple manner.

Furthermore, it can be provided that the first engagement element and the second engagement element are formed by a single engagement element, wherein the individual engagement element is formed in particular by a screw, preferably an expansion screw. It is thereby achieved that both the movement of the clamping elements from the first spatial arrangement into the second spatial arrangement and the displacement of the clamping elements from the second spatial arrangement into the first spatial arrangement can be effected by adjusting a single engaging element.

Furthermore, it can be provided that the shaft insert has a covering sleeve, wherein the covering sleeve at least partially surrounds the part of the shaft insert projecting from the hollow shaft. This ensures that the visible part of the output shaft has a visually particularly pleasing outer contour. Furthermore, this ensures that the shaft insert is protected against contamination and mechanical influences, in particular vandalism. Furthermore, this outer contour can be designed independently of the shaft insert. In particular, the cover sleeve may be made of a different material than the shaft insert and / or have a different color and / or have a different surface finish.

Furthermore, it can be provided that the hollow shaft and / or the shaft insert has at least one holding element, wherein the holding element or the holding elements the shaft insert non-positively and / or positively fix in the hollow shaft when the clamping elements are in the first spatial arrangement. This ensures that the assembly of the door drive is much easier because a fitter can use the shaft insert in the hollow shaft and has both hands free to spend, for example, the clamping elements in the second spatial arrangement. In particular, the holding force of the holding element is selected such that the holding element is able to hold at least the weight of the shaft insert, in particular at least the weight of the shaft insert and a force transmission element. In particular, the holding force of the holding element is selected such that the shaft insert is manually displaceable in the hollow shaft, preferably continuously, when the clamping elements are in the first spatial arrangement.

Furthermore, it can be provided that the holding element is formed by an elastic ring, in particular made of rubber, wherein in particular the ring is arranged in a circumferential groove in one of the clamping elements. This ensures that the clamping element is particularly inexpensive to produce and easy to integrate into the output shaft.

Furthermore, it can be provided that the length of the shaft insert is greater than the length of the hollow shaft, wherein in particular the length of the shaft insert is less than 300%, preferably less than 200%, more preferably less than 150% of the length of the hollow shaft. This ensures that even if the hollow shaft is filled to its full length by the shaft insert, the shaft insert protrudes with one end of the hollow shaft. This end can then be connected to the force transmission between the door drive and power transmission element with the power transmission element.

Furthermore, it can be provided that the shaft insert has a non-circular outer profile and the hollow shaft has a corresponding non-circular inner profile, wherein the non-circular outer profile of the shaft insert engages in the non-circular inner profile of the hollow shaft. This ensures that the shaft insert is reliably protected in the inserted state into the hollow shaft against rotation relative to the hollow shaft. Thus, relatively high torque between the hollow shaft and the shaft insert can be transmitted.

In particular, the outer profile of the shaft insert can be oval or polygonal, for example triangular, quadrangular, pentagonal or hexagonal, shaped, wherein the hollow shaft has a corresponding oval or polygonal, for example triangular, quadrangular, pentagonal or hexagonal inner profile.

Furthermore, it can be provided that the hollow shaft has an internal toothing and the shaft insert has an external toothing, wherein the external toothing engages in the internal toothing when the shaft insert is inserted in the hollow shaft. This ensures that a rotation of the shaft insert is prevented in the hollow shaft.

The door drive may in particular be arranged directly on or in the door leaf, on or in a wall, on or in a door frame or on or in the floor. The door drive can in particular be selected from the group of overhead door closers, the door-mounted door closer, the frame door closer or the floor spring. The door drive can be designed as a mechanical door drive or as an auxiliary power operated door drive.

Mechanical door drives are often referred to as door closers or door closing means with controlled closing sequence. A door closer is capable of storing at least a portion of the energy used during opening of the door by the door opener. After the door has been released by the user, the door closer can use the stored energy to automatically close the door leaf again.

An auxiliary door drive may in particular be an electric and / or electromechanical and / or electrohydraulic and / or pneumatic door drive, wherein the door leaf, ie by means of electric and / or electromechanical and / or electrohydraulically and / or pneumatically generated auxiliary power, closed and / or can be opened. The auxiliary power can in this case be dimensioned such that the auxiliary power acts as a support, d. H. that the user has to expend a reduced own power when opening and / or closing the door. The auxiliary power can also be dimensioned such that the door is automatically opened by the assistant, d. H. that no intrinsic force has to be expended by the user in addition to the assistant. Preferably, the auxiliary power, in particular as a function of the opening angle of the door leaf, adjustable. In the case of a failure of the auxiliary power, auxiliary power operated door drives preferably also fulfill the functions of a mechanical door drive, in particular the function of automatically closing or opening the door.

Door drives may preferably have at least one safety device. The safety device can in particular limit the opening force and / or the opening speed. In addition or as an alternative, the safety device can in particular monitor the swivel range of the door leaf and trigger a safety function when a person or an object gets into the swiveling range of the door leaf. A safety function may include, for example, stopping the door leaf, reducing the speed of the door leaf, or reversing the motion of the door leaf.

Door drives preferably have at least one monitoring device. The monitoring device may in particular have sensors that can detect dangerous environmental conditions, such. As fires, smoke or dangerous concentration of gases (eg carbon monoxide). The monitoring device can trigger a safety function after the detection of dangerous environmental conditions. For example, a security feature may include overriding an automatic opening function of the door. The monitoring device and the safety device can be designed separately or be formed by a common device.

Door drives may preferably have at least one pulse generator. The pulse generator can in particular give the command to open and / or close the door. The command given by the pulser is processed by a controller, with the controller controlling the door leaf movement commanded by the pulser. Pulse encoders are differentiated into conscious impulse generators (eg switches, pushbuttons), through which the door leaf movement is intentionally introduced, and unconscious impulse generators (eg light barriers, radar, contact mats), over which the door leaf movement unconsciously enters upon entering the impulse generator monitored area is initiated.

Furthermore, door drives can preferably control or regulate the closing movement of the door leaf such that the closing operation can be delayed for a, in particular adjustable, time. This damping function is also referred to as closing delay.

Furthermore, door drives may preferably comprise a housing. The housing may preferably be formed substantially cuboid. The housing may preferably have at least one first opening for coupling the output arranged in the housing with a force transmission element. It can also be provided that one of the first opening opposite second opening is provided in the housing for coupling the output with a power transmission element. On the housing decorative elements may be arranged which cover parts of the housing or even the housing substantially completely. The housing is preferably made of a material. In particular, the housing may be made of a metallic material. It is further preferred that the housing is formed in one piece. The housing can also be formed by several sections. The housing may be at least partially made of plastic.

• Montieren des Türantriebs nach einem der Ansprüche 1 bis 12 an einer Tür
• Einsetzen des Welleneinsatzes in die Hohlwelle
• Verbringen der Klemmelemente aus der ersten räumlichen Anordnung in die zweite räumliche Anordnung.

Hierdurch wird erreicht, dass der Türantrieb einfach an unterschiedliche Montagepositionen angepasst wird. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen, der Beschreibung und in den Figuren angegeben.The previously derived and indicated object is further achieved on the basis of the above-described method for assembling a door drive in that the method comprises the following steps:

• Mounting the door drive according to one of claims 1 to 12 on a door
• Inserting the shaft insert into the hollow shaft
• Spend the clamping elements from the first spatial arrangement in the second spatial arrangement.

This ensures that the door drive is easily adapted to different mounting positions. Advantageous developments of the invention are specified in the dependent claims, the description and in the figures.

Furthermore, it can be provided that a force transmission element is connected to the shaft insert. This ensures that forces between the door drive and the shaft insert are transferable.

Furthermore, it can be provided that the shaft insert is inserted and fixed so deep in the hollow shaft, that the force transmission element extends in the mounted state substantially horizontally. This ensures that the visual appearance of the door drive in interaction with the power transmission element and the door for the viewer is appealing. A non-horizontal force transmission element is usually interpreted by a viewer as a technical defect.

Features and details which are described in connection with the door drive according to the invention also apply in connection with the method according to the invention and vice versa. The features mentioned in the description and in the claims may each be essential to the invention individually or in combination. In particular, a method that is feasible with a door drive according to one of claims 1 to 12, and a door drive on which a method according to any one of claims 13 to 15 can be performed, provided under protection.

• Fig. 1 zeigt schematisch den erfindungsgemäßen Türantrieb 1,
• Fig. 2 schematisch den Welleneinsätze 5,
• Fig. 3a - 3c schematisch eine Schnittdarstellung des erfindungsgemäßen Türantriebs 1 in drei verschiedenen Montagepositionen.

The invention will be explained in more detail with reference to embodiments. Technical features with the same function are provided in the figures with identical reference numerals. Show it:

• Fig. 1 shows schematically the door drive 1 according to the invention,
• Fig. 2 schematically the shaft inserts 5,
• Fig. 3a - 3c schematically a sectional view of the door drive 1 according to the invention in three different mounting positions.

In Fig. 1 an inventive door drive 1 is shown with an output shaft 2. The output shaft 2 has a hollow shaft 4 and a shaft insert 5. The door drive 1 is coupled to a power transmission element 3. About the force transmission element 3 forces between the door drive and a door to be driven, which is not shown here, transferable.

Fig. 2 shows the shaft insert 5 in an exploded view (right) and assembled (left). The shaft insert 5 has a first clamping element 5a and a second clamping element 5b. The clamping elements 5a, 5b of the shaft insert 5 can be moved relative to one another by relative displacement in the direction of the axis of rotation of the hollow shaft 4 from a first spatial arrangement into a second spatial arrangement.

The first clamping element 5a in the Fig. 2 illustrated shaft insert 5 has a holding element 11 in the form of a rubber ring, wherein the rubber ring is arranged in a groove, wherein the groove in the outer contour of the shaft insert 5 is arranged. The holding member 11 fixes the shaft insert 5 non-positively and / or positively in the hollow shaft 4, when the clamping elements 5a, 5b are in the first spatial arrangement. The shaft insert 5 has an external toothing 7. The shaft insert 5 has an engagement element 8, wherein the engagement element 8 is formed by an expansion screw. By adjusting the engaging element 8, the clamping elements 5a, 5b from the first Spatial arrangement in the second spatial arrangement and from the second spatial arrangement in the first spatial arrangement can be brought.

The clamping elements 5a, 5b of the in Fig. 2 Shaft insert 5 shown can be assembled to form a substantially cylindrical body. In this case, one of the clamping elements 5a, 5b has a recess and the other of the clamping elements 5a, 5b has a corresponding nose, wherein the nose can be inserted into the recess of the respective other clamping element 5a, 5b. The nose on the first clamping element 5a is formed here in the form of a wedge. The recess corresponding to the nose is formed on the second clamping element 5b in the form of a wedge-shaped recess. The opening angle of the wedge-shaped recess is chosen to be smaller than the opening angle of the wedge. Apart from the nose or the corresponding recess and the external toothing 7, both clamping elements 5a, 5b have substantially the shape of a straight circular cylinder.

The Fig. 3a to 3c show a sectional view of the door drive 1 according to the invention in three different mounting positions. The output shaft 2 has here a hollow shaft 4 and a shaft insert 5. The shaft insert 5 has a first clamping element 5a and a second clamping element 5b. The clamping elements 5a, 5b are connected to each other by the engagement element 8. The engagement element 8 is formed by a screw. The attack element 8 has an attack 9 for a tool, for example a screwdriver. The engagement element 8 connects the shaft insert 5 with a force transmission element 3 such that a rotation of the shaft insert 5 about the longitudinal axis of the shaft insert 5 also leads to a rotation of the force transmission element 3 about the longitudinal axis of the shaft insert 5 and vice versa. The shaft insert 5 is thus rotatably connected to the power transmission element 3.

As the Fig. 3a to 3c show the shaft insert 5 can be pushed to different positions within the hollow shaft 4 and fixed there. The fixation is carried out by the clamping elements 5a, 5b of the shaft insert 5 are moved by relative displacement in the direction of the axis of rotation of the hollow shaft 4 to each other from the first spatial arrangement in the second spatial arrangement. In the first spatial arrangement of the shaft insert 5 in the hollow shaft 4 is freely displaceable. By means of a tool, not shown, the screw which forms the engagement element 8 can be attracted via the attack 9. As a result, the first clamping element 5a and the second clamping element 5b are moved toward one another in the direction of the axis of rotation of the hollow shaft 4. The axis of rotation of the hollow shaft 4 extends in the Fig. 3a to 3c perpendicular. The axis of rotation of the shaft insert 5 and the axis of rotation of the hollow shaft 4 match. By the displacement of the first clamping element 5a relative to the second clamping element 5b, the legs 12, which delimit the wedge-shaped recess of the second clamping element 5b, are spread in a direction transverse to the axis of rotation of the hollow shaft 4. This results in a frictional connection between the second clamping element 5b and the hollow shaft 4. Thus, the shaft insert 5 is fixed without play within the hollow shaft 4. By loosening the screw which forms the engagement element 8, the fixation can be canceled.

Characterized in that the opening angle of the wedge-shaped recess is selected smaller than the opening angle of the wedge, the first clamping element 5a without deformation of the wedge tip in the second clamping element 5b dive and the legs 12 which define the wedge-shaped recess of the second clamping element 5b, spread. Alternatively, the opening angle of the wedge may also have the same opening angle as the wedge-shaped recess, but the wedge, for example, must be made shorter than the wedge-shaped recess or a deformation of the tip of the wedge must be accepted.

Like from the FIGS. 3b and 3c can be seen, the hollow shaft 4 has an internal toothing 6 and the shaft insert 5 has an external toothing 7, wherein the external toothing 7 engages in the internal toothing 6 when the shaft insert 5 is inserted in the hollow shaft 4.

Furthermore, the shaft insert 5 has a covering sleeve 10, wherein the covering sleeve 10 partially surrounds the part of the shaft insert 5 protruding from the hollow shaft 4. Here, the cover sleeve 10 covers the outer toothing 7 of the shaft insert 5, whereby the door drive 1 receives an attractive appearance and the shaft insert 5 is protected from contamination and mechanical influences, in particular vandalism.

LIST OF REFERENCE NUMBERS

1

door drive

2

output shaft

3

Power transmission element

4

hollow shaft

5

roller insert

5a

first clamping element

5b

second clamping element

5a, 5b

clamping elements

6

internal gearing

7

external teeth

8th

engaging member

9

attack

10

cover sleeve

11

retaining element

12

leg

Claims (15)

Door drive (1) with an output shaft (2) for coupling the door drive (1) with a power transmission element (3), characterized in that the output shaft (2) comprises a hollow shaft (4) and a shaft insert (5), wherein the shaft insert ( 5) in the hollow shaft (4) is insertable, wherein the shaft insert (5) at least a first clamping element (6a) and at least a second clamping element (6b), wherein the clamping elements (6a, 6b) of the shaft insert (5) by relative displacement in Direction of the axis of rotation of the hollow shaft (4) from each other from a first spatial arrangement in a second spatial arrangement can be brought, wherein the shaft insert (5) in the first spatial arrangement in the hollow shaft (4) is movable and the shaft insert (5) in the second spatial arrangement in the hollow shaft (4) non-positively and / or positively fixed, wherein the first clamping element and / or the second clamping elements (6a, 6b) in the second spatial arrangement in a Richtu ng be spread across the axis of rotation of the hollow shaft. Door drive (1) according to one of the preceding claims, characterized in that the clamping elements (6a, 6b) of the shaft insert (5) by relative displacement in the direction of the axis of rotation of the hollow shaft (4) from each other from the second spatial arrangement in the first spatial arrangement can be brought , Door drive (1) according to one of the preceding claims, characterized in that the shaft insert (5) in the hollow shaft (4) is continuously displaceable when the clamping elements (6a, 6b) are in the first spatial arrangement. Door drive (1) according to one of the preceding claims, characterized in that the shaft insert (5) has a first engagement element (8), in particular with an attack (9) for a tool, wherein by adjusting the engagement element (8), the clamping elements (6a, 6b) from the first spatial arrangement in the second spatial arrangement can be brought, wherein the first engagement element (8) is formed in particular by a screw, preferably an expansion screw. Door drive (1) according to one of the preceding claims, characterized in that the shaft insert (5) has a second engagement element (8), in particular with an attack (9) for a tool, wherein by an adjustment of the engagement element (8), the clamping elements (6a, 6b) from the second spatial arrangement can be brought into the first spatial arrangement, wherein the second engagement element (8) is formed in particular by a screw, preferably an expansion screw. Door drive (1) according to one of the preceding claims, characterized in that the first engagement element (8) and the second engagement element (8) by a single engagement element (8) are formed, wherein the single engagement element (8) in particular by a screw, preferably an expansion screw is formed. Door drive (1) according to one of the preceding claims, characterized in that the shaft insert (5) has a covering sleeve (10), wherein the covering sleeve (10) at least partially surrounds the part of the shaft insert (5) projecting from the hollow shaft (4). Door drive (1) according to one of the preceding claims, characterized in that the hollow shaft (4) and / or the shaft insert (5) has at least one holding element, wherein the holding element (11) or the holding elements (11) force the shaft insert (5) - and / or positively lock in the hollow shaft (4), when the clamping elements (6a, 6b) are in the first spatial arrangement. Door drive (1) according to one of the preceding claims, characterized in that the holding element is formed by an elastic ring, in particular rubber, wherein in particular the ring is arranged in a circumferential groove in one of the clamping elements (6a, 6b). Door drive (1) according to one of the preceding claims, characterized in that the length of the shaft insert (5) is greater than the length of the hollow shaft (4), wherein in particular the length of the shaft insert (5) is less than 300%, preferably less than 200 %, more preferably less than 150% of the length of the hollow shaft (4). Door drive (1) according to one of the preceding claims, characterized in that the shaft insert (5) has a non-circular outer profile and the hollow shaft (4) has a corresponding non-circular inner profile, wherein the non-circular outer profile of the shaft insert (5) in the non-circular inner profile of the hollow shaft (4) intervenes. Door drive (1) according to one of the preceding claims, characterized in that the hollow shaft (4) an internal toothing (6) and the shaft insert (5) has an external toothing (7), wherein the external toothing (7) engages in the internal toothing (6) when the shaft insert (5) in the hollow shaft (4) is inserted. Method for assembling a door drive (1), characterized in that the method comprises the following steps: - Mounting the door drive (1) according to one of claims 1 to 12 on a door - Inserting the shaft insert (5) in the hollow shaft (4) - Spend the clamping elements (6a, 6b) from the first spatial arrangement in the second spatial arrangement. Method for mounting a door drive (1) according to one of the preceding claims, characterized in that a force transmission element (3) with the shaft insert (5) is connected. Method for assembling a door drive (1) according to one of the preceding claims, characterized in that the shaft insert (5) is inserted and fixed so deeply into the hollow shaft (4) that the force transmission element (3) extends substantially horizontally in the mounted state.

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