Door actuator

Abstract

A door actuator comprises an elongated housing intended for mounting to a support, an electric drive within the housing, said electric drive having a rotatable output shaft (17), and an arm (6) transmitting the rotation of the output shaft to a door hingedly connected to the support. The output shaft is provided with splines (29) on its outer wall. The arm comprises a mounting body (22) having a cavity corresponding to the splines therein, wherein the output shaft extends at least partly into the cavity. The mounting element further comprises a transverse cavity (35) in which an at least partly conical body (36) is arranged to force the output shaft in radial direction against the cavity. As a result, the spline ridges on the output shaft are forced against the corresponding cavity to accommodate manufacturing tolerances as well as a sliding clearance between the spline shaft and the cavity.

Description

Technical Field

[0001] This invention relates to a door actuator for actuating a door rotatably connected to a support by means of a hinge. The invention also relates to a closing system including the door actuator. Background Technology

[0002] Various types of door actuators are known in the art, such as the spring-biased door actuator disclosed in WO 2012 / 103572 intended only for closing doors; the hydraulically damped spring-biased door actuator disclosed in WO 2018 / 228729 intended only for closing doors; and the electric door actuator disclosed in WO 2019 / 048359 intended for both opening and closing doors. This invention generally relates to the latter type of door actuator, which is operated by an electric actuator. Because of the use of an electric actuator, which is used for both opening and closing the door, this type of door actuator is also frequently referred to by the term "door opener."

[0003] The door actuator disclosed in WO 2019 / 048359 includes: an elongated housing configured to be mounted to a support, wherein the elongated housing extends longitudinally between an upper end and a lower end; an electric actuator within the housing having an output shaft rotatable (i.e., in a direction of rotation about the longitudinal direction) when the electric actuator is activated; and an arm extending between a proximal end and a distal end, configured to actuate (i.e., open or close) the door when the output shaft rotates, wherein the proximal end is coupled to the output shaft, and wherein the distal end is configured to be connected to a hinge or a door. The output shaft is typically rotatable in two opposite directions of rotation, i.e., a first direction of rotation for opening the door and a second direction of rotation for closing the door.

[0004] WO 2019 / 048359 discloses almost no details regarding the connection between the output shaft and the arm. This connection is only shown in cross-sections of Figures 7 through 10 of WO 2019 / 048359. It can be inferred from this that the output shaft is generally pin-shaped and fits into a cavity provided for this purpose in the proximal end of the arm. WO 2019 / 048359 does not describe further details regarding the connection between the output shaft and the arm.

[0005] Description of the present invention The object of this invention is to provide an electric door actuator that improves the connection between the output shaft and the arm.

[0006] According to the invention, this objective is achieved by: an output shaft having a spline extending along the longitudinal direction on its outer wall, and an arm having a mounting body at its proximal end, the mounting body having a cavity corresponding to the spline and facing an elongated housing, wherein the output shaft extends at least partially into the cavity, and the mounting element having a transverse cavity in which a body at least partially tapered is arranged to force the output shaft against the cavity in a radial direction perpendicular to the longitudinal direction.

[0007] First, a splined output shaft fitted into the corresponding cavity enables direct coupling between the output shaft of the electric actuator and the arm that transmits rotational motion to the door or hinge. This coupling requires no additional components, such as a transverse pin extending through the arm and the output shaft. Thus, according to the invention, a direct coupling is provided between the output shaft of the electric actuator and the arm without any additional and / or intermediate components.

[0008] Furthermore, the transverse cavity and the at least partially tapered body together ensure that the output shaft is forced against the sidewall of the cavity in the arm. More specifically, the at least partially tapered body applies pressure (and counter-pressure on the mounting element, which is part of the arm) to the output shaft, forcing the output shaft and mounting element to separate at the position of the tapered body in a direction perpendicular to the longitudinal direction of the tapered body. By forcing the output shaft and mounting element to separate at the position of the tapered body, the opposite effect is produced on the opposite side of the output shaft, thus forcing the output shaft and mounting element against each other on the opposite side of the output shaft. As described below, this forced abutment is advantageous because it forces the spline ridge on the output shaft against the corresponding cavity.

[0009] The reason for this is that the splined shaft assembled into the corresponding cavity is not always precisely fitted. There will always be manufacturing tolerances, which may differ for the spline and the cavity. Furthermore, a minimum sliding clearance is typically set so that the splined shaft can slide into the cavity with minimal resistance. Due to this tolerance between the splined shaft and the cavity in the arm, when the electric actuator is activated, the output shaft undergoes a certain initial rotation (e.g., a few degrees) that is not transmitted to the arm, which is undesirable. Moreover, this same tolerance is visually detrimental when the door is in its open position, because similarly, a similar slight rotation of the arm relative to the output shaft is possible. Therefore, the door gives the impression that it is not fully secured. By forcing the splined shaft to partially abut against the corresponding cavity, the tolerance and its associated disadvantages are locally eliminated.

[0010] An embodiment of the present invention is characterized in that at least the tapered portion of the at least partially tapered body is rotationally symmetrical with respect to the longitudinal axis of the at least partially tapered body. Preferably, the entire at least partially tapered body is rotationally symmetrical with respect to its longitudinal axis.

[0011] Using a rotationally symmetric tapered portion avoids the need for arranging a tapered body in a specific orientation within the transverse cavity. Therefore, this need not be considered during the installation of the door actuator.

[0012] An embodiment of the invention is characterized in that a transverse cavity is formed by a through opening passing through the mounting element, the transverse cavity being provided with an inner collar. Preferably, the at least partially tapered body includes a head, an elongated body, and a free end, the free end being provided with threads engaged by a fastener, the fastener at least partially abutting against the inner collar to pull the at least partially tapered body toward the inner collar. More preferably, the free end is provided with a cavity in which the threads are internally arranged, and wherein the fastener is a bolt, the head of which abuts against the inner collar.

[0013] The transverse cavity, in the form of a through opening, allows for the placement of additional fastening elements to hold the tapered body in its desired position relative to the mounting body of the arm. More specifically, additional fasteners (e.g., nuts or bolts) can be placed on the free end of the tapered body, for example by means of threads, abutting against the inner collar, thus aiding in the positioning of the tapered body in the longitudinal direction of the through opening. Bolts are most recommended as additional fasteners, with the head of the bolt abutting against the inner collar and engaging with the internal threads within the cavity at the free end of the tapered body. In fact, alternative variations such as nuts require thinning the free end of the tapered body to extend through the inner collar, and therefore can only withstand smaller forces.

[0014] An embodiment of the present invention is characterized in that the transverse cavity is provided with threads, which are engaged by a body that is at least partially tapered.

[0015] In this way, the tapered body can be translated longitudinally within the transverse cavity by means of rotation. Due to the presence of the tapered portion, the translation results in a smaller or larger force acting on the output shaft. In other words, the position of the tapered body can be easily changed, for example, if the output shaft wears down over time, this wear may cause additional clearance between the shaft and the arm.

[0016] An embodiment of the invention is characterized in that the splines on the output shaft are serrated. In other words, a serrated shaft is used. This shaft is typically provided with uniform splines, so the position of the output shaft relative to the tapered body in the direction of rotation does not need to be considered. Furthermore, the serrated shaft has a large number of spline ridges, so that for the same force, the pressure generated during the transmission of rotation is lower compared to a smaller number of spline ridges (i.e., a smaller contact surface).

[0017] An embodiment of the present invention is characterized in that the output shaft has an imaginary centerline extending in the longitudinal direction, wherein the transverse cavity is surrounded by a minimum imaginary cylinder that does not intersect the imaginary centerline. Specifically, the shortest distance between the minimum imaginary cylinder and the imaginary centerline is at least 1 cm.

[0018] Therefore, the transverse cavity of its internally arranged tapered body is spaced apart from the imaginary centerline of the output shaft. Thus, the tapered body pushes against the outside of the output shaft, rather than the tapered body extending through a more complex structure. In this more complex structure, the tapered body pushes the output shaft away along its longitudinal direction, which is also perpendicular to the longitudinal direction of the elongated housing. A minimum distance of at least 1 cm allows for an output shaft with a diameter of at least 2 cm, thus making the output shaft sufficiently robust to transmit the required force from the electric actuator to the arm, specifically to obtain a torque of 100 Nm acting on the arm.

[0019] The embodiment of the present invention is characterized in that the transverse cavity extends along a third direction, which is perpendicular to the longitudinal direction, and preferably also perpendicular to the radial direction.

[0020] In this embodiment, the transverse cavity and thus the tapered body extend perpendicular to the output shaft, and preferably also perpendicular to the radial direction (i.e., the direction in which the tapered body applies force to the output shaft). This results in the least amount of material that needs to be removed from the mounting element compared to a transverse cavity that is inclined relative to the longitudinal and / or radial directions. Therefore, this embodiment is economical in terms of excess material (i.e., material that needs to be removed).

[0021] An embodiment of the present invention is characterized in that the body, which is at least partially tapered, rotates together with the output shaft when the electric driver is activated.

[0022] Therefore, no friction is generated between the tapered body and the output shaft during the rotation of the output shaft.

[0023] An embodiment of the present invention is characterized in that the outer wall of the output shaft at least partially coincides with an imaginary hyperboloid, which corresponds to the tapered portion of a body that is at least partially tapered, wherein the body that is at least partially tapered contacts the output shaft at the location of the partial coincidence.

[0024] Therefore, in this embodiment, a line contact is formed between the tapered body and the output shaft. Compared to point contact, line contact is advantageous in avoiding excessive pressure that could damage the output shaft. It should be understood that at the overlap, the spline is partially interrupted.

[0025] An embodiment of the present invention is characterized in that the body, which is at least partially tapered, eliminates the sliding clearance between the output shaft and the cavity in the mounting body.

[0026] As described above, eliminating sliding clearance is advantageous for preventing undesirable rotation of the door relative to the support.

[0027] The above advantages can also be achieved by means of a closing system, which includes a support, a door hinged to the support, and a door actuator as described above.

[0028] An embodiment of the invention is characterized in that an elongated housing is attached to a support member, and in that the closing system further includes a guide rail mounted to the door, wherein the distal end of the arm engages in the guide rail.

[0029] Using a guide rail on a door allows the door actuator to act directly on the door, unlike those disclosed in WO 2019 / 048359, without the intervention of a hinge. Therefore, the door actuator can be used in closing systems where hinges (e.g., hinges between the support and the door) are not easily accessible.

[0030] Brief description of the attached figures The invention will now be further illustrated with the aid of the following description and accompanying drawings.

[0031] Figure 1 A perspective view of a door actuator according to the invention installed in a closing system is shown.

[0032] Figure 2 A perspective view of a door actuator according to the present invention is shown.

[0033] Figure 3 It shows Figure 2 A partial exploded view of the top of the door actuator.

[0034] Figure 4 It shows the through Figure 2 The horizontal cross-section at the top of the door actuator. To make... Figure 4 Clearly, the shading lines representing the sectioning elements have been omitted.

[0035] Figure 5 It shows the through Figure 2 The vertical cross-section of the top of the door actuator. To make... Figure 5 Clearly, the shading lines representing the sectioning elements have been omitted.

[0036] Embodiments of the present invention The invention will now be described with reference to specific embodiments and certain accompanying drawings, but the invention is not limited thereto and is limited only by the claims. The drawings presented herein are merely illustrative and not restrictive. In the drawings, the sizes of some elements may be exaggerated for illustrative purposes, meaning that the relevant elements are not drawn to scale. Dimensions and relative dimensions do not necessarily correspond to an actual reduction in practice of the invention.

[0037] Furthermore, terms such as "first," "second," and "third" in the specification and claims are used to distinguish similar elements and are not necessarily used to describe a sequence or timing. These terms are interchangeable where appropriate, and embodiments of the invention may operate in a sequence other than that described or shown herein.

[0038] Furthermore, for descriptive purposes, terms such as “top,” “bottom,” “above,” “below,” “left,” “right,” “front,” and “rear” are used in the specification and claims. These terms, particularly “top,” “bottom,” “above,” “below,” “front,” and “rear,” should be understood and interpreted in the context of the normal positioning of the door actuator, where its longitudinal direction is substantially the same as the vertical direction.

[0039] The term "comprising" as used in the claims and its derivatives should not be construed as limiting oneself to the means listed thereafter; the term does not exclude other elements or steps. The term should be interpreted as specifying the presence of the mentioned feature, integer, step, or component; however, it does not exclude the presence or addition of one or more additional features, integers, steps, or components, or combinations thereof. Therefore, the scope of the expression, for example, "device comprising means A and B," is not limited to a device consisting solely of components A and B. Rather, it means that, for the purposes of this invention, only components A and B are relevant.

[0040] The term "substantially" includes variations of + / - 10% or less from the specified conditions, preferably + / - 5% or less, more preferably + / - 1% or less, and even more preferably + / - 0.1% or less, provided that such variations are applicable to the functions disclosed in this invention. It will be understood that the term "substantially A" is intended to also include "A" itself.

[0041] This invention generally relates to an electrically driven door actuator 3 for actuating (i.e., closing and opening) a closing system, and more specifically, for actuating a closing system used outdoors (i.e., as part of a fence, barrier, door, etc.). Closing systems (such as...) Figure 1 (As shown) includes a column 1 (more generally a support member, such as a wall, rod, hollow tube, etc.) and a door 2 (more generally a rotatable closing member, such as a gate, door, window, etc.). In the context of an outdoor closing system, the support member 1 is typically constructed of a hollow tube. This hollow tube usually has a square or rectangular cross-section with an outer dimension of 4 cm, 5 cm, or 6 cm (e.g., a rectangular cross-section of 4 cm × 6 cm or a square cross-section of 4 cm × 4 cm). The hollow tube may also have a circular cross-section, with a typical outer diameter of 4 cm, 5 cm, or 6 cm.

[0042] Door 2 is mounted to support 1 by means of hinge 4, particularly eyebolt hinges, such as those disclosed in EP1528202, EP 2778331, or EP 3162997, the contents of which are incorporated herein by reference. On the other side of door 2, an additional support 5 is provided, which may be equipped with a lock and retainer assembly, such as locks disclosed in EP 1118559, EP 2915939, EP 2186974, EP 3153645, EP 4191007, or EP4245951 (the contents of which are incorporated herein by reference), and retainers disclosed in EP 1600584, EP 1680567, EP 3153645, EP 4159958, or EP 4245951 (the contents of which are incorporated herein by reference).

[0043] Figure 1 The illustrated door actuator 3 has an arm 6 that directly engages the upper hinge 4. Thus, the arm 6 extends between a proximal end 6a (which is disc-shaped in the illustrated embodiment) and a distal end 6b, with the distal end 6b provided with a protruding pin 9 that engages the hinge 4 to force the door 2 to its closed position. More specifically, the arm 6 engages a coupling mechanism disposed on the eyebolt hinge 4, as disclosed in WO 2019 / 048359, the contents of which are incorporated herein by reference. In the illustrated embodiment, the arm 6 is made of aluminum, but other materials may also be used.

[0044] Figure 2A modified door actuator 3 is shown. This door actuator 3 is not intended to act directly on the hinge 4, but rather on the door 2. For this purpose, a guide rail 7 is provided, which is intended to be fixed to the door 2. Thus, the guide rail 7 is attached to the door 2 by means of fasteners 8. Preferably, mounting components disclosed in EP 1907712 or EP 3575617 are used, the contents of which are incorporated herein by reference. An arm 6 extends between a proximal end 6a (in the illustrated embodiment, the proximal end is disc-shaped) and a distal end 6b, the distal end being provided with a protruding pin 9 that engages the guide rail 7. In the illustrated embodiment, the arm 6 is made of aluminum, but other materials may also be used.

[0045] The door actuator 3 generally comprises an elongated housing 10 that extends longitudinally 11 between an upper end 10a and a lower end 10b. During normal use, the longitudinal direction 11 is generally aligned with the vertical direction.

[0046] The elongated shell 10 can be manufactured from different materials and using different production methods. In the illustrated embodiment (e.g.) Figure 4 As can be seen in the diagram, the elongated housing 10 is formed by a plastic frame 12 attached to the support 1. A shell 13 is mounted to this plastic frame, preferably made of extruded aluminum, but other materials, particularly metals, can also be used. In the illustrated embodiment, the shell 13 is attached to the frame 12 by means of ribs 20 that slide in corresponding dovetail grooves, allowing the shell 13 to slide onto the frame in the longitudinal direction 11. The top 10a of the housing 10 is sealed by an upper seal 14, and the bottom 10b of the housing 10 is sealed by a lower seal 15. These seals 14, 15 can be made of metal or plastic, with plastic being preferred because it is easier to use during the injection molding process.

[0047] The elongated housing 10 is mounted to the support 1 by means of one or more fasteners 16. Preferably, mounting components disclosed in EP1907712 or EP 3575617 are used, the contents of which are incorporated herein by reference. Other methods of mounting the door actuator 3 to the closing system are also possible, the details of which are known to those skilled in the art.

[0048] The door actuator 3 includes an electric actuator (not shown). This actuator includes at least an electric motor, and may also include, if desired, a speed reducer for reducing the speed of the electric motor and increasing its torque. The electric motor is advantageous due to its compact size, which allows it to be incorporated into a housing 10 (particularly a hollow tube) fitted onto the support 1, i.e., without protruding relative to the outer dimensions of the support 1. In one embodiment, the electric actuator includes a speed reducer with a reduction ratio between 1:100 and 1:1000, for example, 1:200 or 1:400.

[0049] An electric drive (particularly an electric motor) includes a motor body (not shown) having means for rotating an output shaft 17. This output shaft can be the output shaft of the electric motor, or, if a reducer is present, the output shaft of the reducer. Figure 5 As shown, the output shaft 17 extends to the upper end 10a of the housing 10. When the motor is activated, the output shaft can rotate about the longitudinal direction 11 in two opposite directions of rotation.

[0050] The electric actuator also includes an electronic control unit (not shown) for controlling the door actuator 3. In the prior art, this electronic control unit is typically integrated into the support member 1. This is because the support member 1 has ample space to accommodate components. However, this has the disadvantage of requiring a sufficiently large opening to be made in the hollow support member 1, which can damage its finish (e.g., its paint) and adversely affect structural integrity. To prevent this, in the illustrated embodiment, the electronic control unit is located inside the housing 10. The electronic control unit preferably allows for immediate calibration of the rest position of the arm 6 when the door actuator 3 is mounted onto the closing system.

[0051] The present invention is generally aimed at improving the coupling between the output shaft 17 and the arm 6. Reference will now be made to... Figures 3 to 5 Describe the coupling.

[0052] Figure 3 A partial exploded view of the top of the door actuator 3 is shown. For clarity, the upper seal 14 and housing 13 have been omitted. A mounting body 22 is provided at the proximal end 6a of the arm 6. (As shown) Figure 5 As shown, the mounting body 22 is secured to the proximal end 6a of the arm 6 by means of bolts 23 (generally fasteners). The mounting body 22 is inserted into the upper end 10a of the housing 10. For this reason, in the illustrated embodiment, the mounting body 22 is generally cylindrical, allowing it to rotate within the housing 10.

[0053] Figure 3A mounting ring 30 is further shown, from which the output shaft 17 protrudes. The mounting ring 30 is intended for mounting the door actuator 3 to the support member 1 by means of two fasteners 16. For this purpose, the mounting ring 30 is provided with two through openings 31, portions of the fasteners 16 extending through each through opening respectively. The mounting ring 30 is arranged within the housing 10 and is concealed by the outer casing 13. Therefore, the mounting ring 30 is a static element that does not rotate with the output shaft 17. The electric actuator is located below the mounting ring 30 (viewed along the longitudinal direction 11), and the output shaft 17 (i.e., the output shaft of the motor or, if present, the output shaft of the reducer) extends through the mounting ring 30. Positioning the mounting ring 30 around the output shaft 17 helps to prevent or reduce torsional forces. In fact, the force transmission between the door actuator 3 and the door 2 is concentrated at the location of the output shaft 17 and the mounting body 22, while the force transmission between the door actuator 3 and the support member 1 is concentrated at the location of the mounting ring 30. A large distance between these elements could generate torsional forces, which is undesirable.

[0054] like Figure 3 As shown, the output shaft 17 has a spline 29 on its outer wall, wherein the spline ridges extend along the longitudinal direction 11. In the illustrated embodiment, the output shaft 17 is a serrated shaft with serrated splines 29, although other splines may be used, such as a square or rectangular shaft. Figure 5 As shown, the output shaft 17 is inserted into the cavity 28 at the bottom of the mounting body 22. The cavity 28 has a shape corresponding to the spline 29 on the output shaft 17. Rotation of the output shaft 17 thereby causes rotation of the arm 6.

[0055] According to the present invention, the mounting body 22 is further provided with a transverse cavity 35, in which at least a partially conical body 36 is placed. In the illustrated embodiment, as Figure 4 As best seen, the transverse cavity 35 is formed by a through opening extending throughout the entire mounting body 22. This transverse cavity 35 extends in a tangential direction 40, which is perpendicular to the longitudinal direction 11. A radial direction 41 is also defined as a direction perpendicular to both the longitudinal direction 11 and the tangential direction 40. The tangential direction 40 and the radial direction 41 define a plane that, in normal use, substantially coincides with the horizontal plane.

[0056] The body 36, at least partially tapered, includes a head 37, a tapered portion 38, and a free end 39. In the illustrated embodiment, the head 37 is provided with external threads. Figure 4The external thread (omitted in the cross-section) is fitted into a corresponding thread within the transverse cavity 35 for mounting the tapered body 36 within the transverse cavity 35. Due to the mating thread, rotation of the tapered body about its longitudinal axis causes the tapered portion 38 to translate tangentially in the direction 40. Therefore, for this purpose, it is advantageous for the tapered portion to be rotationally symmetrical with respect to its own longitudinal direction (which coincides with the tangential direction).

[0057] The tapered portion 38 has a reduced diameter and contacts the outer wall of the output shaft 17 directly. The tapered body is inserted into the transverse cavity 35, causing the tapered portion 38 to contact the outer wall of the output shaft 17 and apply force to the output shaft in the radial direction 41. The tapered body 36 is inserted into the transverse cavity 35 to a sufficient depth (e.g., by screwing the tapered body 36 into the cavity 35), forcing the output shaft 17 (particularly its spline 29) against the cavity 28 in the mounting body 22 in the radial direction 41, in order to eliminate any manufacturing tolerances and / or any sliding clearances.

[0058] In the illustrated embodiment, for this purpose, the outer wall of the output shaft 17 is provided with a hyperboloid section 45 to achieve line contact between the tapered portion 38 and the output shaft 17.

[0059] In the illustrated embodiment, an additional hole is provided in the tapered body 36. The fastening element includes a bolt 47 (generally a fastener) that screws into a cavity 44 at the free end 39 of the tapered body 36. The head of the bolt 47 abuts against an inner collar 48 within the transverse cavity 35. If desired, this fastening element can also completely replace the function of the thread 37. The bolt 47 can also be replaced by a nut that engages an external thread on the free end 39 of the tapered body 36. However, for this purpose, the free end 39 needs to be thin enough to fit through the inner collar 48.

[0060] Although certain aspects of the invention have been described in conjunction with specific embodiments, it should be understood that these aspects may be implemented in other forms within the scope defined by the claims.

Claims

1. A door actuator (3) for actuating a door (2), the door being rotatably connected to a support (1) by means of a hinge (4), the door actuator comprising: - An elongated housing (10) extending in a longitudinal direction (11) between an upper end (10a) and a lower end (10b), the housing being configured to be connected to the support member; - An electric actuator, located within the housing, having an output shaft (17) that is rotatable when the electric actuator is activated; as well as - An arm (6) extending between a proximal end (6a) and a distal end (6b) and configured to actuate the door when the output shaft rotates, wherein the proximal end is coupled to the output shaft, and wherein the distal end is configured to connect to the door or the hinge. The characteristic feature is that the output shaft has a spline (29) extending along the longitudinal direction on its outer wall, and the arm has a mounting body (22) at its proximal end, the mounting body having a cavity (28) therein, the cavity corresponding to the spline and facing the elongated housing, wherein the output shaft extends at least partially into the cavity, and The mounting element is provided with a transverse cavity (35) in which at least part of a tapered body (36) is arranged to force the output shaft against the cavity in a radial direction (41) perpendicular to the longitudinal direction.

2. The door actuator according to claim 1, characterized in that, The at least conical portion of the at least partially conical body is rotationally symmetrical with respect to the longitudinal axis of the at least partially conical body.

3. The door actuator according to claim 2, characterized in that, The at least partially conical body is rotationally symmetrical with respect to its longitudinal axis.

4. The door actuator according to any one of the preceding claims, characterized in that, The transverse cavity is formed by a through opening through the mounting element, and the transverse cavity is provided with an inner collar (48).

5. The door actuator according to claim 4, characterized in that, The at least partially tapered body includes a head (37), an elongated body (38), and a free end (39) provided with threads engaged by a fastener (47) at least partially abutting against the inner collar to pull the at least partially tapered body toward the inner collar.

6. The door actuator according to claim 5, characterized in that, The free end is provided with a cavity (44), the thread is internally arranged in the cavity of the free end, and wherein the fastener is a bolt, the head of the bolt abutting against the inner collar.

7. The door actuator according to any one of the preceding claims, characterized in that, The transverse cavity is provided with threads, which are engaged by the at least partially tapered body.

8. The door actuator according to any one of the preceding claims, characterized in that, The splines on the output shaft are serrated.

9. The door actuator according to any one of the preceding claims, characterized in that, The output shaft has an imaginary centerline extending along the longitudinal direction, wherein the transverse cavity is surrounded by a minimum imaginary cylinder that does not intersect the imaginary centerline, wherein, in particular, the shortest distance between the minimum imaginary cylinder and the imaginary centerline is at least 1 cm.

10. The door actuator according to any one of the preceding claims, characterized in that, The transverse cavity extends along a third direction (40), which is perpendicular to the longitudinal direction, and preferably, the third direction is also perpendicular to the radial direction.

11. The door actuator according to any one of the preceding claims, characterized in that, The at least partially tapered body rotates together with the output shaft when the electric drive is activated.

12. The door actuator according to any one of the preceding claims, characterized in that, The outer wall of the output shaft at least partially coincides with an imaginary hyperboloid, which corresponds to the tapered portion of the at least partially tapered body, wherein the at least partially tapered body contacts the output shaft at the partially overlapping portion (45).

13. The door actuator according to any one of the preceding claims, characterized in that, The at least partially tapered body eliminates the sliding clearance between the output shaft and the cavity in the mounting body.

14. A closing system comprising a support (1) and a door (2) hinged to said support, characterized in that, The closing system further includes a door actuator (3) according to any one of the preceding claims.

15. The shut-off system according to claim 14, characterized in that, The elongated housing (10) is attached to the support, and the closing system further includes a guide rail (7) mounted to the door, wherein the distal end of the arm engages in the guide rail.

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