EP3339561A1 - Shading device with emergency opening function - Google Patents

Abstract

A shading device has an emergency opening function, the device comprising an electric drive motor, a winding shaft (12), a curtain windable on the winding shaft (12) and a mechanical emergency drive (44), wherein the drive motor via a freewheel (14) in the Charging is locked, is connected to the winding shaft (12), wherein the emergency drive (44) via a coupling (32) with the winding shaft (12) is connected, and wherein the clutch (12) by the operation of the emergency drive (44 ) is controlled by load or movement in a closed position and is in a load-free emergency drive (44) in an open position.

Description

The invention relates according to the preamble of claim 1, a shading device with an emergency opening function, wherein the device comprises an electric drive motor, a winding shaft, a wound on the winding shaft curtain or windable with the winding shaft elevator and a mechanical emergency drive, wherein the drive motor via a freewheel , which is locked in the approach direction of the curtain, is coupled to the winding shaft

Such shading devices can be configured, for example, as shutters, external venetian blinds or blinds with lamellae hangings, roller blinds, awnings or other systems for closing building openings. Electric drives are used for many of these systems to provide the user with increased ease of use. The end positions are usually detected inside the motor, whereby the revolutions of the motor shaft are detected and thus the revolutions of the winding shaft are determined. Under emergency drive are understood drives that replace the electric drive as an alternative, for example in emergencies, but also in other cases where the manual opening is preferred.

The self-weight of the hangings usually supports the extension movement, so that the motor usually only has to overcome low friction moments, as described e.g. occur in a self-locking curtain, the self-locking is used in many embodiments of known hangings to hold the curtain in any position when the electric drive is stopped.

Self-locking drive but have the problem that the shading system in a power failure usually can not be opened easily.

From the DE 89 01 398 U1 For example, a device of the aforementioned type is already known, in which the electric drive motor is connected via a freewheel with the winding shaft. Furthermore, a quick opening device is provided, which allows the system to open even in the event of a motor failure, wherein the freewheel avoids that the motor must be rotated, which would also not be possible with a self-locking drive. The disadvantage of this solution is that the emergency drive is always moved in a method of hanging by means of the electric drive, so he must be particularly strong dimensions. There is a risk that the emergency drive, if it must be used after years, already worn, even though he has never been used.

From the DE 2 445 187 C3 Furthermore, a Venetian blind is known in which a coupling portion alternately connects a motor or a manually operated emergency transmission with a head shaft for the Behangverstellung.

The DE 79 36 599 U1 shows further a solution to avoid a freewheel, in which a special displacement anchor brake motor is used.

Finally, emergency opening devices are also known in which a separate drive, for example a prestressed spring accumulator or another electric drive motor, acts on the winding shaft for emergency raking. These auxiliary drives usually require a very high effort and are used only in special cases for prescribed escape routes. To use them at every building opening to create more escape routes, these facilities are simply too expensive.

The object of the present invention is to improve a shading device of the type mentioned in that a simple emergency opening device is kept in a shading system, which allows opening an additional escape route, if necessary.

Main features of the invention are specified in the characterizing part of claim 1. Embodiments are the subject of claims 2 to 17.

According to the invention the object is achieved by a shading device of the type mentioned, in which the emergency drive is connected via a clutch to the winding shaft, the clutch by the operation of the emergency drive load or motion controlled switchable in a closed position and in a load-free emergency drive in an open position. The coupling has the advantage that the moving parts of the emergency drive are not put in motion by the electric drive motor in normal operation, so that they are not exposed to wear. They can therefore be designed very simply and inexpensively. At the same time, however, there is the unrestricted possibility to be able to open the blinds of the system if necessary by means of the emergency drive, wherein the freewheel ensures that the electric drive does not have to be rotated, which would not be possible anyway with a self-locking design.

In a first embodiment of the invention, the clutch is designed as a friction clutch, wherein preferably the friction clutch has a wrap spring, which wraps under load of the emergency drive a torsionally rigidly connected to the winding shaft driving shaft with increasing the friction torque. In such a friction clutch is in the coupling in normal operation of the electric drive only a small friction torque, which is not sufficient to enable the parts of the emergency drive in motion. However, if the emergency drive is actuated, the loop spring or another friction element builds up an increased frictional torque, which in turn allows entrainment of the winding shaft by the emergency drive.

In a particularly preferred embodiment of the invention, a jaw clutch is provided as a coupling, which has at least one axially or radially movable jaw member for producing the positive connection in the closed position. A positive claw coupling offers the advantage that it is a form-fitting, secure under all circumstances Entrainment of the winding shaft allows while in normal operation, a complete decoupling of the emergency drive is made possible without additional friction moments.

In an advantageous embodiment of the invention it is provided that the at least one jaw member is mounted on a rotary part of the emergency drive, which is arranged relatively rotatable to a control part which moves the at least one jaw member in the closed position of the clutch during a relative rotation of the rotary member, wherein the at least one jaw element in positive engagement with a rotationally fixed connected to the winding shaft claw adapter passes. By the relative rotation to the set example, with slight frictional engagement control part, a defined switching movement is triggered, which allows a secure engagement of the clutch in the closed position.

Preferably, at least two radially movable pawls are provided as jaw elements, which are pivotally mounted on the rotary member. Radially movable jaw elements have the advantage that the coupling can be implemented constructively in the narrowest axial space. This is of great advantage in shading devices because typically the space above the building opening extends over as wide as possible the width of the opening, i. should be available over the axial length of the winding shaft and other coaxial parts for the blind

A preferred control movement of the pawls is achieved in that the pawls each have a control pin offset from the pivot axis, which is guided in a groove contour of the control part, wherein preferably the pawls are further biased in the direction of their disengaged from the jaw adapter position by means of a spring element. The springs ensure that the pawls are also returned to their rest position, in which the emergency drive is decoupled from the winding shaft when an emergency opening is completed and a reverse rotation takes place. However, the return to the release position can also be done by a skillful design of the contour in particular in a simple manner, if the maximum relative rotation angle between the two parts is limited. The control part can be taken for example by overcoming a friction torque by the rotary member after the relative movement and triggering the switching operation.

In a further preferred embodiment of the invention it is provided that the rotary member is rotationally rigidly connected to a roller or disc. These can preferably be arranged coaxially in order to save axial space.

A preferred variant provides that the roller or disc is designed as a winding roll or disc on which a flexible drive member can be wound up. This results in a manual operation in the manner of a roller shutter, which the user can intuitively perceive for an emergency opening.

It is not necessary to wind the elevator organ on a Gurtrolle outside the plant, because a free end of the drive member can be fixed to a fixed point on the shading device or the building readily. It only has to be prevented that the free end can enter the system.

Particularly preferred is an embodiment of the invention in which a drive spring for retrieving the drive member is provided which biases the winding roller in the direction of the wound state in the direction of rotation, wherein the mainspring may be clamped for example between a stationary mounting and the rotary member. Working as a return spring mainspring ensures that a belt or other elevator organ is wound after an emergency operation again and again on the winding roll or disc. The dog clutch is designed so that it changes under the action of the spring and the associated reverse rotation in the open position, which can be realized easily with wrap springs or controlled by a contour pawls.

The elevator organ can be sufficiently long to catch up even a fully extended curtain by a continuous unwinding. But it is also readily possible that the elevator organ is shorter than required for complete mounting of the curtain, so that the catching-up process takes place by multiple actuation of the meantime retrieved by the mainspring elevator member. The advantage here is that only a considerably shorter supply of the elevator must be wound on the winding roll / disc, which is a compact space and a cost-effective implementation of good.

Instead of a winding element, the roller or disc may also be formed as a pulley or pulley over which a circumferential, loop-shaped flexible drive member is guided under frictional or positive entrainment. For shading, where the user Such controls is accustomed, such as ball chains or endless lines in blinds or blinds, the usual operation can be intuitively adopted for the emergency release.

Preferred is an embodiment in which the freewheel decouples the drive motor from the winding shaft in the departure direction only above a limit torque. This has the advantage that the drive motor can also be used to support the extension movement, whereby e.g. an obstacle but then triggers the freewheel.

As already mentioned, it is expedient and preferred for many applications that the electric drive motor or a transmission lying between the drive motor and the freewheel is designed to be self-locking. This allows the curtain in any intermediate position by simply stopping the electric drive safely held in place.

In the following, reference will be made to an embodiment of the invention with reference to the accompanying drawings.

The figure shows a shutter drive 10 with a winding shaft 12 which is driven by an electric drive motor (not shown). The motor is coupled via a freewheel 14 and a driver element 16 with the winding shaft 12, wherein a not shown, consisting of a plurality of contiguous slats roller shutter is wound on this winding shaft 12.

The electric drive is self-locking, i. the dead weight can not lower the curtain from an intermediate position, if there is no rotational movement of the motor in the downward direction. The downward movement begins when the electric drive rotates simply or works supportively up to a defined support torque, which is considerably smaller than the lift torque required to catch up the curtain. To automatically switch off the drive at the two end positions of the curtain, the revolutions of the shaft are recorded inside the motor.

The winding shaft 12 is rotatably mounted on a bearing cap 20 via a ball bearing 18. The bearing cap 20 is attached to a pin 22 by means of a screw 24, wherein the pin 22 is formed on a bearing plate 26 attached to a side part 25 of the shutter. The pin 22 is connected via a bearing ring 28 on the bearing plate 26, on which a housing 30 is rotatably mounted as a rotary part of a dog clutch 32. The rotary member or housing 30 is rotatably disposed relative to a contour disc 34 as a control part over a certain rotation angle range, in which guide contours 36 are formed for two control pins 38 which are formed on pawls 40 as radially switchable jaw members of the clutch 32. The contour disc 34 is shown rotated from the perspective in the plane of the illustration to better illustrate the guide contours 36. The pawls 40 are pivotally mounted on the rotary member, wherein the pivot axes are arranged offset by a certain distance from the control pins 38, whereby a pivotal movement of the pawls 40 in a radially spread open position of the clutch can be achieved by relative rotation of the rotary member to the control part. Optional spring elements (not shown) may preload the pawls 40 in the direction of their radially pivoted position in which the dog clutch 32 is opened, which is particularly useful if no limitation of relative rotatability between the contour disc 34 and the housing 30 is provided. The pawls 40 can then pass out of the contours 36 and are pushed back by the springs in this. With a limitation, however, a forced return by opposing, relative twisting can certainly be achieved alone. For this purpose, the contour disc 34 sits with a slight frictional torque on the bearing ring 28, so that it is then taken along by the control pins 38 when they reach an end of the guide contours 36.

The pawls 40 act as movable jaw members of the dog clutch 32 together with a jaw adapter 42, between the jaws they are engaged in their radially expanded pivot position, so that a torsionally rigid connection between the housing / rotary member 30 and the winding shaft 12 can be made in the Claw adapter 42 is inserted in a form-fitting manner.

The housing / rotary member 30 is part of an emergency drive 44, by means of which the closed curtain can be opened in the event of a power failure or failure of the electric drive. In the embodiment shown, a belt pulley 46 is provided for this purpose, which is coaxially rotationally rigidly connected to the housing 30. For this purpose, 30 axial ribs 50 are provided on an outer peripheral surface 48 of the housing, which engage in axial grooves 52 in an inner peripheral surface 54 of the belt pulley 46. On the belt pulley 46, a roller shutter belt 56 is wound, the free end of which is fixed at a fixed point (not visible).

Between the housing 30 and the bearing plate 26 or the side part 24 of the shutter, a torsion acting, helical mainspring 58 is clamped with bias, which tends to turn back the housing 30 and the belt pulley 46 in a direction in which the roller shutter belt 56 is wound on the belt pulley 46.

The freewheel 14 ensures - as already mentioned - that the curtain can be made up with the help of the emergency drive 44 when the self-locking electric drive fails or can not be used due to a power failure. In normal operation, however, the pawls 40 of the dog clutch 32 are in their radially retracted position, in which the claw adapter 42 can rotate freely without taking parts of the emergency drive 44. This is therefore subject in normal operation, no wear.

If the emergency drive 44 is now actuated when the electric main drive is blocked by pulling on the roller shutter belt 56, the housing 30 connected rigidly with the belt pulley 46 rotates relative to the standing contour disk 34. The control pins 38 thereby move along the guide contours 36 into one another on the axis of rotation radially outward position, so that the pawls 40 are placed and get into positive engagement with the jaws of the jaw adapter 42. The contour disc 34 is initially frictionally seated on the bearing ring 28 and is carried along by the housing 30 in the direction of rotation as soon as the pins 38 have reached the end of the respective guide contour. Upon further actuation of the roller shutter belt 56, the winding shaft is rotated accordingly in the Aufholrichtung, whereby the curtain can be made up. During the Aufholbewegung the mainspring 58 is further biased.

As soon as the roller shutter belt 56 is released, the mainspring 58 rewinds the roller shutter belt 56 onto the belt pulley 46, the pins 38 being returned to the opposite ends of the guide contours 36 as a result of the relative rotation of the housing 30 to the contour disk 34 frictionally mounted on the bearing ring 28 arrive, ie the pawls are pivoted back into their folded position, in which they are disengaged from the claws. The winding shaft 12 remains correspondingly in the position when releasing the roller shutter 56th

It is therefore also possible to interrupt the catching-up process of the curtain by releasing it in the meantime and then continue to wind the belt without the hanging position changing in the meantime. This means that the roller shutter belt 56 can also be made considerably shorter than would be required to catch up in a train. As a result, the belt length can be significantly reduced, so that in the area of the emergency drive 44 only slightly radial Space for winding the roller shutter belt is needed if this circumstance should play a role.

The invention is not limited to one of the above-described embodiments, but can be modified in many ways. Thus, the same effect emergency drives can also be used in other shading systems as roller shutters, which have a winding shaft, such. in systems with cloth hangings or lamella hangings, which are adjustable in their extension length with winding lift belts. Instead of the operating belt described in connection with the roller shutter and operating cords, circulating ball chains or endless cords can be used, endless actuators are not combined with a mainspring. A control crank can also be used for manual actuation of the emergency drive with a corresponding deflection gear.

All of the claims, the description and the drawings resulting features and advantages, including design details, spatial arrangements and method steps may be essential to the invention both in itself and in various combinations.

LIST OF REFERENCE NUMBERS

10

Roller shutter drive

12

winding shaft

14

freewheel

16

dogging

18

ball-bearing

20

bearing cap

22

pivot

24

screw

25

side panel

26

bearing disk

28

bearing ring

30

Housing / swivel

32

claw clutch

34

Contour disk / controller

36

guide contour

38

control pin

40

Jack / jaw member

42

claws adapter

44

Standby drive

46

belt pulley

48

Outer circumferential surface

50

axial ribs

52

axial grooves

54

Inner circumferential surface

56

roller shutter belt

58

mainspring

Claims (17)

Shading device with an emergency opening function, wherein the device comprises an electric drive motor, a winding shaft (12), a winding windable on the winding shaft (12) or a winding member wound with the winding shaft and a mechanical emergency drive (44), wherein the drive motor via a freewheel ( 14), which is locked in the Auffahrrichtung the curtain, is coupled to the winding shaft (12), characterized in that the emergency drive (44) via a coupling (32) with the winding shaft (12) is connected, wherein the coupling (12 ) by the operation of the emergency drive (44) load or motion controlled in a closed position is switchable and is in a load-free emergency drive (44) in an open position. Shading device according to claim 1, characterized in that the coupling is designed as a friction clutch. Shading device according to claim 2, characterized in that the friction clutch has a wrap spring, which wraps around under load of the emergency drive a torsionally rigidly connected to the winding shaft driving shaft with increasing the friction torque. Shading device according to claim 1, characterized in that a jaw clutch (32) is provided as the clutch, which has at least one axially or radially movable jaw member (40) for producing the positive locking in the closed position. Shading device according to claim 4, characterized in that the at least one jaw element on a rotary part (30) of the emergency drive (44) is mounted, which is arranged relatively rotatable to a control part (34), the at least a relative rotation of the rotary member (30) a claw member (40) in the closed position of the clutch (32) moves, wherein the at least one claw member (40) in positive engagement with a rotationally fixed to the winding shaft (12) connected to claw adapter (42) passes. Shading device according to claim 5, characterized in that as claw elements at least one radially movable pawl (40) are provided which are pivotally mounted on the rotary member (30). Shading device according to claim 6, characterized in that the pawls (40) each have a control pin (38) offset from the pivot axis, which is guided in a guide contour (36) of the control part (34). Shading device according to claim 7, characterized in that the pawls (40) are biased in the direction of their disengaged from the claw adapter (42) position by means of a spring element and / or the relative rotational path between the rotary member (30) and the control part (34) is limited , Shading device according to one of the preceding claims, characterized in that the rotary member (30) is rotationally rigidly connected to a roller or disc. Shading device according to claim 9, characterized in that the roller or disc as a winding roll or disc (46) is formed, on which a flexible drive member (56) can be wound. Shading device according to claim 10, characterized in that a free end of the drive member is fixed to a fixed point. Shading device according to claim 10 or 11, characterized in that a drive spring (58) for retrieving the drive member (56) is provided which biases the winding roller or disc (46) in the direction of the wound state in the direction of rotation. Shading device according to claim 12, characterized in that the drive spring (58) between a stationary mounting and the rotary member (30) is clamped. Shading device according to claim 12 or 13, characterized in that the elevator member (56) is shorter than required for complete mounting of the curtain, so that the catching up process by multiple operation of the meantime by the mainspring (58) retrieved elevator member (56). Shading device according to one of claims 1 to 9, characterized in that the roller or disc is designed as a pulley or pulley over which a circumferential, loop-shaped flexible drive member is guided under frictional or positive entrainment. Shading device according to one of the preceding claims, characterized in that the freewheel (14) decouples the drive motor from the winding shaft (12) in the travel direction only above a limit torque. Shading device according to one of the preceding claims, characterized in that the electric drive motor or between the drive motor and the freewheel (14) lying gear is designed to be self-locking.

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