EP3771794B1 - Door drive - Google Patents

Description

The invention relates to a door operating device according to the preamble of claim 1.

Such a door operating device is, for example, from DE 295 09 233 U1 known and is referred to there as the drive shaft. This publication discloses a device for operating doors, the device being arranged, for example above a door, on the solid masonry and connected to the door via a deflection lever. This door operating device can open a door independently based on a drive when a person approaches the door and comes into the range of a door opening sensor, and then the operating device closes the door again. Such door operating devices are in widespread use, for example in clinics, in public buildings and the like.

When a person approaches the door to be opened, this movement is detected by a sensor and an electric motor is started. The electric motor rotates a bevel gear via a shaft and this rotational movement is transmitted via the bevel gear to the drive linkage, which pivots the reversing lever and thereby causes the door to open.

The disadvantage of this is that the drive linkage is pressed in and requires pretension, with a press-out tool being necessary to dismantle the drive linkage.

Other door operating devices are known which have drive linkages which are conical and are drawn into a drive shaft with an inner cone. Such a door operating device is, for example, in DE 10 2005 029 623 A1 disclosed. For this purpose, the drive shaft has a hole through which a screw for pulling in the drive rod is passed and with a central one Internal thread is screwed to the tip of the drive linkage. If the screw is tightened, the cone of the drive linkage is pulled into the inner cone of the drive shaft and pressed in depending on the torque. Due to the ceiling-side mounting of the actuating device, above the frame, the screw is inserted into the actuating device from above in order to pull the drive rod inserted from below into the drive shaft.

However, this type of installation is unfavorable because there may be little space between the actuating device and the ceiling to insert the screw or to turn/drive the screw with a tool.

In addition, a pressing tool is always necessary to loosen the press fit between the inner cone of the drive shaft and the outer cone of the drive linkage. Such a pressing tool can have an M10 thread, for example.

The invention is therefore based on the object of further developing a drive linkage of the type mentioned in such a way that an improved assembly result can be achieved with this, through a special structural design.

The object is achieved according to the invention by the features of independent patent claim 1, while advantageous refinements and developments of the invention can be found in the subclaims.

According to the invention, a cylinder screw is mounted with its head in the interior of a hollow drive linkage, the head resting against a shoulder of the drive linkage on one side so that it cannot be displaced, and the cylinder screw having a thread which can be screwed to an internal thread of the drive shaft.

Such a cylinder screw can be, for example, a hexagon socket ISO 4762-M10x70/50 A4 screw.

Optionally, a sealing ring can be attached between the head of the cylinder screw and the shoulder, which encloses the shaft of the screw.

According to the invention, the head of the cylinder screw is mounted between the shoulder and a union screw in the interior of the drive linkage.

The union banjo bolt can, for example, have a size of M17x0.5, with an inner diameter of 10 mm.

The union hollow screw has a hole through which a tool can be passed in the direction of the cylinder screw in order to turn the cylinder screw. For example, a hexagonal wrench can be used to reach through the union screw in order to drive/turn the hexagon socket located in the head of the cylinder screw and thus turn the screw.

If the screw, which has a right-hand thread, for example, is tightened, the thread of the cylinder screw engages in the thread (the hole) of the drive shaft and the entire drive linkage is pulled into the drive shaft.

The union hollow screw also has an external thread, which can be screwed to an internal thread in the interior of the drive linkage. To do this, the union banjo bolt is inserted into the drive linkage until it reaches the internal thread and then twisted with a tool so that the external thread engages with the internal thread.

For this purpose, the union hollow screw has at least one engagement on its end face, into which a tool for rotating the union hollow screw can be inserted. There are preferably two eccentric holes into which two cylinder pins of a tool can engage.

The thread of the cylinder screw is preferably a standard thread and the external thread of the union hollow screw is preferably a fine thread.

In another embodiment, the thread of the cylinder screw is a right-hand thread and the external thread of the union hollow screw is a left-hand thread.

In another embodiment, the thread of the cylinder screw has a different pitch than the external thread of the union hollow screw.

Such different characteristics of the individual threads prevent unwanted loosening or loosening of the screw connection. Such a loosening can occur when the drive linkage is driven out of the drive shaft if the thread of the union hollow screw has the same pitch and the same direction of rotation as the thread of the screw.

In a further embodiment it is provided that the union hollow screw is axially secured by a locking ring on the side opposite the cylinder screw.

In a further embodiment, it is provided that the union hollow screw is glued or welded into the interior of the drive linkage and is thus secured against axial displacement.

In a further embodiment, the union hollow screw can be dispensed with and a locking ring can be used, with the head of the cylinder screw being mounted between the above-mentioned shoulder and the locking ring in the interior of the drive linkage. This internal locking ring (with ends pointing inwards) is used to secure the axial position of the screw head and is a standard part that can be placed in the interior of the drive linkage (hole assembly).

Optionally, this is a circlip bent from round wire and angled twice at the ring joint, which is compressed using circlip pliers during assembly.

The section of the drive linkage inserted into the door operating device has a cone which is inserted into an inner cone of the drive shaft and rests on the inner circumference of the inner cone. The drive linkage is therefore self-centering, as the two cones bring the drive shaft and drive linkage components together centrally.

Although a comparable self-centering system is already known from the prior art, a cylinder head screw reaches through the drive shaft from the opposite side and is screwed to the thread of a hole in the front side of the drive linkage.

When turning the screw, which rests against the through hole of the drive shaft with its head secured against displacement on one side, the thread of the drive linkage is moved along the threads of the cylinder screw and thus the drive linkage is also moved in the axial direction and drawn into the drive shaft.

In the present invention, however, the cylinder screw is located inside the drive linkage and is secured against displacement on one side, so that when the cylinder screw is rotated and at the same time it engages in a thread, the drive linkage is moved axially in the through hole of the drive shaft. Depending on the direction of rotation of the cylinder screw, the drive linkage is pulled into the inner cone and thus into the drive shaft or pressed out of the drive shaft.

Optionally, a sealing ring can be pushed underneath the head around the shaft of the cylinder screw, which is, for example, a DIN 7603 A 10.2x15.9x1 sealing ring and is made of copper.

Due to the continuously conical shape of the drive shaft and the drive linkage, the drive linkage can be positioned variably in the actuating device, i.e. the drive linkage can be continuously retracted into the drive shaft over a certain distance.

After the drive linkage has been retracted, there is a non-positive connection between the cone of the drive linkage and the inner cone of the drive shaft, with a normal force acting on the surfaces connected to one another. Their mutual displacement is prevented because the counterforce caused by the static friction is not exceeded. The static friction between the active surfaces prevents the drive shaft from starting to rotate relative to the drive linkage.

The inner cone of the drive shaft is adjoined by a hole in the axial direction in which the internal thread is inserted.

The drive shaft has a further inner cone, which is arranged mirror-symmetrically to the first inner cone, with the bore with the internal thread for the cylinder screw running between the two inner cones.

A cylindrical sealing surface adjoins the cone of the drive linkage in the axial direction, on which a shaft sealing ring of the door operating device, when installed, rests in a sealing manner.

The shaft seal is mounted in a flange that is screwed or glued to the housing of the door operating device.

By using such a seal, it is possible to achieve an IP classification, with the device according to the invention achieving protection class IP68. An IP classification indicates the extent of protection a housing offers with regard to contact or foreign objects (first number) and moisture or water (second number).

The subject matter of the present invention arises not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another.

The invention is explained in more detail below with reference to a drawing that only shows one embodiment.

• Figur 1: Schematisierte Ansicht einer Betätigungsvorrichtung nach dem SdT.
• Figur 2: Schnittdarstellung eines Antriebsgestänges nach dem SdT.
• Figur 3: Schnittdarstellung des erfindungsgemäßen Antriebsgestänges
• Figur 4: perspektivische Darstellung des Antriebsgestänges
• Figur 5 a, b: Schnittdarstellung und Draufsicht auf die Überwurfhohlschraube
• Figur 6: Werkzeug zur Montage der Überwurfhohlschraube
• Figur 7: Schnittdarstellung der Betätigungsvorrichtung und des Antriebsgestänges, getrennt
• Figur 8: Schnittdarstellung der Betätigungsvorrichtung und des Antriebsgestänges, montiert

Show it:

• Figure 1 : Schematic view of an actuation device according to the SdT.
• Figure 2 : Sectional view of a drive linkage according to the SdT.
• Figure 3 : Sectional view of the drive linkage according to the invention
• Figure 4 : perspective view of the drive linkage
• Figure 5 a, b : Sectional view and top view of the union banjo bolt
• Figure 6 : Tool for assembling the union banjo bolt
• Figure 7 : Sectional view of the actuating device and the drive linkage, separated
• Figure 8 : Sectional view of the actuating device and the drive linkage, assembled

Figure 1 shows a standard variant of a drive linkage 41 according to the prior art, wherein the drive linkage 41 is inserted from below, against the direction of arrow 27, into an actuating device 26 and is then fixed in the actuating device 26 by a cylinder screw 33.

To do this, the cylinder screw 33 is inserted from the opposite side, in the direction of arrow 27, into the actuating device, which is mounted above the door frame.

By screwing the cylinder screw 33 into the drive linkage 41, the drive linkage 41 is pulled into the actuating device 26 in the opposite direction to the arrow 27. The drive linkage 41 has a cone 40 on its area to be inserted into the actuating device, which forms a central connection with the inner cone 39 of the drive shaft 38 (see Figure 2 ). Here, the cone 40 and the inner cone 39 have the same cone angle. By axially retracting the cone 40 of the drive linkage 41 into the inner cone 39, due to screwing in the cylinder screw 33, a contact pressure is applied in the axial direction, which causes normal forces on the lateral surfaces of the cones 39, 40. This normal force is proportional to the contact force and also depends on the cone angle: the flatter the cone, the higher the normal force produced. Such a cone angle can be, for example, 7°.

A non-positive connection between cone 40 and inner cone 39 is therefore possible.

The drive linkage 41, which is drawn into the inner cone, is connected on its opposite side to the deflection lever 30, which is connected to the door 28 via a fastening 29. Here, the drive linkage 41 is mounted in a bore 32 and has a positive connection with the inner circumference of the bore 32. Such a positive connection is created by the external hexagon 22 or the external hexagon profile with a corresponding internal hexagon of the bore 32.

Figure 2 shows a sectional view of how the cylinder screw 33 is screwed into the bore 34 in the drive shaft 38 in the direction of arrow 27. For this purpose, the bore 34 has a thread.

Due to the screwing movement of the cylinder screw 33 and the simultaneous contact of the screw head on the drive shaft 38, the drive linkage 41 is moved axially in the opposite direction to the arrow 27.

The drive shaft 41 has a cone 40, with which it is drawn into a counter cone 39 of the drive shaft 38. The drive linkage 41 is thus non-positively connected to the drive shaft 38.

Stepless fastening is therefore possible because the outer surface of the cone 40 is smooth.

Figure 3 shows a sectional view of the drive linkage 1 according to the invention, which has a cylindrical area 2 and a cone 3, with a shoulder 4 being arranged between these areas.

The cylindrical area 2 shows in the example shown Figure 4 an external hexagon 22.

Between the cone 3 and the shoulder 4, the drive linkage 1 has a further cylindrical area which is designed as a sealing surface 23, on which, in the assembled state, a shaft seal rests.

The drive linkage 1 has a bore 5 in the interior of the cone 3, which ends approximately at the level of the shoulder 4, and at its rear area in the interior of the cylindrical area 2 a bore 6, which has the same central axis as the bore 5, however is bigger than this. Due to this difference in the diameter of the holes 5 and 6, the shoulder 8 is formed at the transition area of both holes, whereby the shoulder 8 can optionally have a chamfer to simplify further assembly.

In the example shown here, this paragraph 8 is located approximately in the middle of paragraph 4.

The cone 3 has an inner region 7 through the bore 5. Likewise, the cylindrical region 2 has an inner region 11 due to the bore 6.

The inner area 11 has a positioning area 9 in front of the paragraph 8, as well as an internal thread 10 adjoining it in the axial direction.

When inserting the cylinder screw 13 into the interior 11, a sealing ring 12 is first inserted, which comes into contact with the shoulder 8 and is located between the screw head 19 and the shoulder 8 in the assembled state.

The cylinder screw 13 has a thread 15 and a screw head 16, with a smooth shaft 14 being located between the thread 15 and the screw head 16.

The screw head 16 is shaped at the edge or on its top in such a way that it can be connected to a tool for screwing in and out - for example a screwdriver or a wrench.

In the example shown here, the screw head 16 has a hexagon socket 17 for turning the cylinder screw 13.

If the cylinder screw 13 is now inserted through the inner area 11 into the inner area 7 and comes to rest on the shoulder 8 via the sealing ring 12, in the next assembly step a union banjo bolt 19 is also inserted into the inner area 11 and through a, in Figure 6 Assembly tool 24 shown here is screwed to the internal thread 10.

For this purpose, the union hollow screw 18 has an external thread 19, which is designed as a fine thread.

Such a fine thread can e.g. B. M17 with a thread pitch of 1. A fine thread provides greater self-locking, whereby a screw connection cannot loosen itself so easily - for example due to vibrations.

However, the invention is not limited to this, but it is necessary that the thread pitch of this fine thread 19 is less than that of the thread 15 of the cylinder screw 13.

The thread 15 of the cylinder screw 13 can be, for example, M10 with a thread pitch of 1.5.

This has the advantage that the difference between the two thread pitches of the cylinder screw 13 and the union hollow screw 18 prevents the cylinder screw 15 from coming loose, since - in order to turn the cylinder screw one revolution - a further axial distance must be covered, as is the case with that Union banjo bolt at one turn.

In addition, with a fine thread, because of the lower pitch, the self-locking is better than with a standard thread and in the present case there is no need for screw locking for the cylinder screw 13.

By screwing the union hollow screw 18 into the internal thread 10, the screw head 16 of the cylinder screw 13 is fixed between the paragraph 8 and the union hollow screw 18.

The union hollow screw 18 has a bore 20 through which it is possible to reach through with a tool with which the cylinder screw 13 can be turned.

Figure 4 shows a perspective view of the cylinder screw 13 and the drive linkage 1. The drive linkage 1 has an external hexagon 22, which interacts with the corresponding inner circumference of the bore of the deflection lever 30 and can transmit rotary movements.

Figure 5a shows a sectional view of the union hollow screw 18, which, in addition to the cylindrical bore 20, has at least two engagements 21, which are located radially outwards and whose central axes are parallel to the central axis of the bore 20.

Figure 5b shows the union banjo bolt 18 with the two interventions 21 and the thread 19.

This can be done in these interventions 21 Figure 6 Engage the tool 24 shown with the cylinder pins 25 and turn the union banjo bolt 18.

This twisting makes it possible to screw the external thread 19 of the union banjo bolt 18 into the internal thread 10 of the drive linkage 1.

However, the invention is not limited to this. The hollow union screw 18 can also have only one or more interventions, or can be rotated by a different type of tool.

Figure 7 shows how the drive linkage 1 is inserted into the actuating device 26 in the direction of arrow 44, inside the Drive linkage 1 has the cylinder screw 13, which is secured via the union screw 18.

The drive shaft 38 of the actuating device 26 is hollow and has a thread 35 in its central region in a bore 48 into which the cylinder screw 13 with the thread 15 is screwed.

For this purpose, the drive linkage 1 is inserted into the inner cone 39 of the drive shaft 38 until the cylinder screw 13 comes into contact with the thread 35. The cylinder screw 13 is then turned using a suitable tool so that the thread 15 engages with the thread 35 and the drive linkage 1 is pulled into the interior of the actuating device 26 in the axial direction, i.e. in the direction of arrow 44.

The screwing in takes place until the cone 3 of the drive linkage 1 comes into contact with the inner cone 39 of the drive shaft 38.

Here, the two cones 3, 39 have different slopes, i.e. the conicity of the cone 3 is different over a certain distance compared to the conicity of the cone 39 over the same distance.

When the cylinder screw 13 is continuously actuated, the cone 3 is drawn into the inner cone 39 with increasing resistance, which creates a non-positive connection between the drive shaft 38 and the drive linkage 1.

A central connection between the drive linkage 1 and the drive shaft 38 is therefore possible, since the central axis of the drive linkage 1 is brought together centrally with the central axis of the drive shaft 38 by the conical connection. A cone has the advantage that it can be produced easily and with high precision on a lathe.

By using the two cones and pulling the drive linkage 1 into the drive shaft, a frictional connection is created and thus a non-positive transmission of rotary movements between these two components is possible.

In addition to the inner cone 29, the drive shaft 38 also has a mirror-symmetrical inner cone 49, which is located on the opposite side of the bore 48. Thus, with the present actuating device, a door that can be opened on the left or the right can be realized, since a cylinder screw can be screwed into the drive shaft on both sides. Depending on the type of hinge (position of the hinges), doors are referred to as left doors (DIN left door) or right doors (DIN right door). The doors are viewed from the side on which the door hinges are visible and after which the door leaf opens:
By pulling the drive linkage 1 into the drive shaft 38, the sealing surface 23 comes into contact with the shaft sealing ring 36, which in the example shown here is designed as a radial shaft sealing ring. This is in Figure 8 shown.

The shaft sealing ring 36 is installed with a tight fit in the housing cover 42 of the actuating device 26, which in turn is firmly connected to the actuating device. Such a connection can be, for example, an adhesive connection.

The sealing surface 46 of the shaft sealing ring 36 runs on the sealing surface 23 of the rotating drive linkage 1.

In a further embodiment, instead of a sealing surface, a sealing lip of the shaft sealing ring is pressed radially onto the sealing surface 23 of the rotating drive linkage 1 by a tubular spring (worm spring).

The actuating device 26 is therefore sealed from the environment. However, this is only one aspect of this invention, and by using such a seal it is possible to achieve an IP protection class or type of protection with the actuating device.

The drive shaft 38 is rotatably mounted in the actuating device 26 via the two bearings 37, 47 and is driven, for example, via a rack.

If you now want to loosen the connection of the drive linkage and the actuating device or the drive shaft 38, a tool, for example an Allen key, is guided into the inner area 11 and through the bore 20 of the union banjo bolt 18 until it engages with the hexagon socket 17 of the cylinder head screw 13 comes.

Thus, the cylinder screw 13 can be screwed out of the drive shaft 38 by turning the tool, due to the thread engagement 15, 35, in the opposite direction to the arrow 44, until the head 16 comes into contact with the union screw 18.

If the cylinder screw is now turned further, with the screw moving further against the direction of the arrow 44, the head 16 presses against the union hollow screw 18 and, due to the immobility of the union hollow screw 18, also presses the drive linkage 1 against the direction of the arrow 44. The different characteristics of the thread 15 have an effect , 19 supportive, as they make it more difficult for the union screw to rotate. The press connection between the cone 3 and the inner cone 39 is thus released, so that the drive linkage can be removed after this connection has been released.

In Figure 7 The drive 45 can still be seen, which consists of a bent sheet metal.

Drawing legend

1

drive linkage

2

cylindrical area

3

cone

4

Paragraph

5

drilling

6

drilling

7

Interior

8th

Paragraph

9

Location area

10

inner thread

11

Interior

12

sealing ring

13

cylinder head screw

14

shaft

15

thread

16

Head

17

Hexagon socket

18

Union banjo bolt

19

External thread

20

drilling

21

intervention

22

External hexagon

23

sealing surface

24

Tool

25

cylinder

26

Actuating device

27

Arrow direction

28

door

29

Fastening

30

Deflection lever

31

drive linkage

32

drilling

33

cylinder head screw

34

drilling

35

inner thread

36

shaft seal

37

camp

38

drive shaft

39

Inner cone

40

cone

41

drive linkage

42

Housing cover

43

Housing

44

Arrow direction

45

drive

46

sealing surface

47

camp

48

Bore (of 38)

49

Inner cone

Claims (13)

1. Door actuating device (26) having a drive shaft (38) and a drive linkage (1) for power transmission between the drive shaft (38) and a door (28), wherein a reversing lever (30) transfers the rotary movements of the drive linkage (1) to the door (28), and wherein a cheese-head screw (13) connects the drive shaft (38) to the drive linkage (1) mounted therein, wherein the cheese-head screw (13) is mounted with its head (16) in the inner region (11) of the hollow drive linkage (1), and wherein the head (16) rests on a shoulder (8) of the drive linkage (1) on one side to be secured against displacement, and wherein the cheese-head screw (13) has a thread (15) which can be screwed to an internal thread (35) of the drive shaft (38), characterised in that the head (16) is mounted between the shoulder (8) and a union banjo bolt (18) in the inner region (11) of the drive linkage (1) and in that the union banjo bolt (18) has an external thread (19) which can be screwed to an internal thread (10) in the inner region (11) of the drive linkage (1).
2. Door actuating device (26) according to claim 1, characterised in that the union banjo bolt (18) has a bore (18), through which a tool can be passed in the direction of the cheese-head screw (13) in order to rotate the cheese-head screw (13).
3. Door actuating device (26) according to claim 1 or 2, characterised in that the thread (15) of the cheese-head screw (13) is a normal thread and the external thread (19) of the union banjo bolt (18) is a fine thread.
4. Door actuating device (26) according to claim 1 or 2, characterised in that the thread (15) of the cheese-head screw (13) is a right-hand thread and the external thread (19) of the union banjo bolt (18) is a left-hand thread.
5. Door actuating device (26) according to claim 1 or 2, characterised in that the thread (15) of the cheese-head screw (13) has a different pitch than the external thread (19) of the union banjo bolt (18).
6. Door actuating device (26) according to claim 1 or 2, characterised in that the union banjo bolt (18) is secured axially by a securing ring on the side opposite the cheese-head screw.
7. Door actuating device (26) according to claim 1 or 2, characterised in that the union banjo bolt (18) is adhered or welded in the inner region (11) of the drive linkage (1).
8. Door actuating device (26) according to one of claims 1 to 7, characterised in that the union banjo bolt (18) has at least one contact (21) on the end-face side, into which a tool (24) can be inserted for rotary actuation of the union banjo bolt (18).
9. Door actuating device (26) according to one of claims 1 to 8, characterised in that the section of the drive linkage (1) introduced into the door actuating device (26) has a cone (3) which is introduced into an inner cone (39) of the drive shaft (38) and rests on the inner circumference of the inner cone (39).
10. Door actuating device (26) according to claim 9, characterised in that a bore (48), in which the internal thread (35) is introduced, connects to the inner cone (39) of the drive shaft (38) in axial direction.
11. Door actuating device (26) according to claim 10, characterised in that the drive shaft (38) has a further inner cone (49) which is arranged in mirror symmetry to the first inner cone (39), and in that the bore (48) runs between the two inner cones (39, 49).
12. Door actuating device (26) according to one of claims 9 to 11, characterised in that a cylindrical sealing surface (23), on which a shaft sealing ring (36) of the door actuating device (26) rests in sealing manner, connects to the cone (3) of the drive linkage (1) in axial direction.
13. Door actuating device (26) according to claim 12, characterised in that the shaft sealing ring (36) is mounted in a housing cover which is screwed or adhered onto the housing (43) of the door actuating device (26).

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