NO327625B1 - Drive device for a wing, especially a dorfloy or window compartment. - Google Patents

Abstract

A closer spring (19) uses a driven shaft (8) to move a door leaf or window casement in a closing direction. While the closer spring is under pre-tension, the leaf/casement opens with a drive motor (2) and closes through the action of the closer spring. A flexible element on a spring plate (20) transfers force between the drive motor and the closer spring.

Description

The invention relates to a drive device as stated in the introduction to patent claim 1.

From DE-195 00 944 Al, which is incorporated in the introduction to patent claim 1, a drive device for a sash, in particular a door leaf or a window sash, is known with an electric drive motor with which the sash is driven, at least in the opening direction, over a drive shaft . The drive direction has a closing spring with which the wing can be driven in the closing direction over the main shaft. The opening of the wing takes place under the influence of the drive motor. Thereby the closing spring is tensioned. The closing of the wing takes place under the influence of the closing spring. A flexible power transfer element serves to transfer power between the drive motor and the closing spring. The closing spring rests with its one end on a stop arranged in the housing and with its other end on a movable closing plate in the housing. The power transmission element is arranged with one end surrounding it on a cam disc above the scope side and with its other end fixed on the spring plate. The power transmission element is designed as a bowden cable or as a chain.

The use of a Bowden pull has the disadvantage that in connection with a curved disk with a relatively small radius, this is exposed to a large bending. This leads to wear and tear on the bowden cable, which under certain circumstances can burst or break. If one has to reduce this disadvantage by using a bowden cover, it is necessary to use curved discs with a large cross-section, which leads to a large depth of the greenhouse. In the event of a strong tensile load, the bowden cable can also be extended, so that readjustment is necessary to maintain the correct functionality of the drive device.

A chain, in comparison with a bowden chain, is more wear-resistant, but bulky, so that it uses a relatively large installation space in the housing for the drive device. The attachment of the chain to the cam disc and the spring plate is also cumbersome, and when unwinding the chain from the cam disc, it follows that with several layers of chain lying on top of each other, a larger combined cross-section of the cam disc and chain layers is formed, which in turn makes it necessary to have a drive device housing with a large depth .

The invention has the task of providing a suitable drive device whose flexible power transmission element is durable and not subject to wear, which is suitable for curved discs with a small radius and also requires little space.

The task is solved by the features of patent claim 1.

The power transmission element is designed as a flat belt. With the flat belt, a small bending radius can be realised, whereby it can also be used in connection with cam discs with a small cross-section. In order to achieve compact dimensions of the drive device, it is essential that the cross-section of the cam disk determines the depth of the drive device housing. Because the flat belt does not need any lubrication and can achieve a very long service life with certain dimensions, the drive device requires little maintenance. A further advantage of using a flat belt for appropriate operation consists in the fact that, in contrast to a bowden belt, it hardly lengthens even under strong tensile load. This also leads to operation with little maintenance.

The outer material of the flat belt can be made of polyurethane or rubber, whereby the use of other suitable materials such as plastic, especially nylon is also conceivable. It is essential that the material is flexible and wears little.

In order to increase the stability of the flat belt, the outer material can have a line with high tensile strength embedded in it, especially steel line or glass fiber laces.

The assembly of the drive device is simple in that the cam pulley can have a recording opening for recording one strap of the flat belt, whereby the recording opening is designed as a rectangular cross-section, secant-like opening in the edge area of the cam disc and the attachment of the flat belt to the cam disc takes place by inserting the strap into the recording opening of the cam disc and is covered by at least one further length of the flat belt. There then follows a fixation of the flat belt on the cam disc due to friction, whereby additional fastening elements, for example screws, can be omitted.

The assembly on the spring plate side of the flat belt is also simple, as the spring plate can have a sleeve with an opening for receiving the second strap of the flat belt, whereby the fastening of the flat belt on the spring plate can be designed so that the flat belt can be fixed by means of at least one clamping jaw in the opening of the sleeve.

A special secure assembly of the flat belt on the spring plate side can be achieved by the flat belt being fed through the opening in the sleeve, the strap being passed around a bolt during the formation of a loop and again being led in an opposite direction to the opening in the sleeve.

Additional fastening elements for securing the clamping tray in the opening of the sleeve can likewise be omitted as the cross-section of the opening of the sleeve is made very small, whereby the clamping tray is designed complementary to it.

When attaching the flat belt to the cam pulley and to the spring plate, it is essential that the friction fastenability of the flat belt occurs due to function, which means without additional fastening elements. The flat belt and cam pulley may have a surface with high wear resistance. The friction lock is established as soon as the flat belt is exposed to tension. This is always the case with assembled operation, as the flat belt is affected by the closing spring.

Alternatively, the clamping tray in the opening of the sleeve can also be secured using a clamping screw.

The drive motor can be controlled directly or via an electronic control device. For this, a transfer of position and turning or rotation speed to the drive shaft of the control device is necessary. This can be done using a rotation angle sensor.

The angle of rotation sensor can have one or more switches and cooperate with a contact sensor arranged in a rotatable manner on the drive shaft. Alternatively, the rotation angle sensor can be arranged in other places of the drive device, for example on the shaft of the drive motor or a drive element. Here, it is therefore suitable to use an incremental encoder or a potentiometer. Furthermore, the use of a linear encoder is conceivable, which measures the position of a linearly movable drive element, for example the spring plate.

In the control device, a certain fixed or nominal value for the opening and closing speed of the drive device which is connected to the wing can be stored, depending on the wing position. The signal to the rotation angle sensor is at all times compared to the value of the nominal profile and the drive motor is controlled accordingly. The closing of the wing takes place under the action of the closing spring. In this way, the drive motor is driven as a generator and thereby slows down the closing process. Braking can be done by directly connecting a constant braking resistor to the drive motor. Likewise, the braking can be canceled just before the closing position of the wing is reached, to provide a so-called "final shock". This can be done by means of a switch that is operated just before the door leaf when the closed position and the position of the door leaf are operated and the brake current circuit is broken. A "comfortable" braking can take place with the help of the control device, as the braking resistance can be varied by wing position and speed.

The nominal or fixed value that can be stored in the control device can be assigned during the start of operation within the framework of a so-called "learning speed". The drive motor can therefore be operated with a predetermined effect or performance in the opening and closing direction. Thus, the necessary parameter for the operation of the drive device, as well as the opening width and weight (moment of inertia) of the wing are known. The set bias of the closing spring can also be provided with the help of this parameter sequence and displayed on a suitable display device. During comparison with the announced or given wing weight, a reference can then also be made, for example, with the help of the indicator device, regarding a reduction or increase of the pre-tension of the extinguishing spring which must be carried out for adaptation to the relevant weight of the closed door leaf or window sash.

The control device can be designed in such a way that the operating conditions in normal operation of the drive device can be stored in the form of a protocol. This operating protocol can, for example, be retrieved by an authorized person during maintenance of the drive device.

One option for spring force adjustment is that the housing-fixed stop for the closing spring is designed as an adjustment nut. For this, the adjusting nut has an internal thread, which interacts with an external thread on a threaded sleeve. The threaded sleeve can have a tool engagement so that when the threaded sleeve is turned, the adjusting nut displaces itself in the spring housing and thereby causes a change in the preload of the closing spring.

In what follows, an embodiment of the drawing is described in more detail with reference to the figures. The figures show: Fig. 1 a plan view of the mechanical components of a drive device (manufactured without housing); Fig. 2 a section taken along the line A-A of the drive device in fig. 1; Fig. 3 an enlarged representation of the drive device in fig. 2 in the area of a curved disc; Fig. 4 an enlarged representation of the drive device in fig. 2 in the area of the spring housing; Fig. 5 a compared with fig. 4 slightly different design of the drive device in an enlarged representation of the area of the spring housing; Fig. 6 a compared with fig. 4 and 5 changed design of the drive device in an enlarged view in the area of the spring plate. Fig. 1 shows the mechanical components of a drive device 1, whereby the housing of the drive device 1, in which these components are arranged, is not shown here for overview reasons. The drive device 1 has a rotatable drive device designed as a drive shaft 8 and is arranged in a known manner on or in a rotatably supported wing or wing/section, respectively on or in a stationary frame, whereby a not shown ktaft transmitting rod can be rotatably connected to the drive shaft 8.

On the motor shaft of the drive motor 2, a screw 3 is rotatably mounted, which engages with a first, rotatably arranged gear 4 on a shaft 5 stored in the drive device. On this shaft 5, a second gear 6 is rotatably arranged, whose cross-section is smaller than the first gear 4 which engages with the worm 3. The smaller gear 6 engages with a third gear 7 which is rotatably arranged on the drive shaft 8 of the drive device 1, whose cross-section is larger than that of the second gear 6. Likewise, a cam disc 9 is rotatably arranged on the drive shaft 8, on which cam disc 9 a winding flat belt 10 is guided around the circumference. The flat belt is introduced through an opening in a spring housing 11.

A contact sensor 12 which is rotatably arranged on the drive shaft 8 cooperates with a rotation angle sensor 13. The contact sensor 12 can be designed as a cam disc and the rotation angle sensor 13 as an electric switch that can be operated by the cam disc, as well as a combination of several switches. Use of other types of suitable rotation angle sensors, respectively lncremental encoder or potentiometer is also conceivable, and likewise a device in other places of the drive device, for example on the shaft of the drive motor 12 or as a linear distance sensor in the spring housing. The output signal from the rotation angle sensor 13 is led to a control device for the drive device. The contactor 12 can be adjustable in relation to the drive shaft 8, so that at a desired position of the drive device 1 of the closed movable wing, for example in its fully open position, an output signal is provided from the angle of rotation sensor 13 and the drive motor 2 is disconnected via the control device.

The inner space of the spring housing 11 is shown in fig. 2. On the side of the longitudinal spring housing 11 that faces the drive motor 2, a cover 17 is arranged. Through a central opening in the cover 17, an adjustment device 15 for a threaded sleeve 16 extends out of the spring housing 11. The threaded housing 16 has a ring device that inside in the spring housing 11 is supported against the cover 17. The area of the threaded sleeve 16 that extends into the inner space of the spring housing 11 has an external thread, which cooperates with the internal thread of an adjusting nut 18. The adjusting nut 18 is displaceable parallel to the longitudinal axis of the spring housing 11 , and secured by means of a non-shown anti-rotation device against rotation in relation to the spring housing 11. The setting device 15 for the threaded sleeve 16 can be hexagonal in order to form an engagement with a correspondingly designed tool. A rotation of the threaded sleeve 16 thereby causes a displacement of the setting nut 18 parallel to the longitudinal axis of the spring housing 11.

On the setting nut 18, one end of a closing spring 19 shaped like a coil spring rests. The other end of the closing spring 19 is supported on a further, parallel to the longitudinal axis of the spring housing 11, displaceable spring plate 20. This spring plate 20 has a centric opening for receiving and fixing it the second strap end 29 to the flat belt 10. The flat belt 10 extends through an opening 14 of the threaded sleeve 16 in the spring housing 11 and extends to the spring plate 20, concentrically inside the windings of the closing spring 19. The closing spring 19 affects the spring plate 20, in the drawing on the right, so that it is provided a traction force in the flat belt 10. The previously described setting device 15 for the threaded sleeve 16 makes it possible to set the pretension of the closing spring 19.

If the drive motor 2 is fed with current to make an opening, it causes the drive device consisting of the screw 3 and the gears 4, 6, 7 to turn the drive shaft 8 anti-clockwise. Above the power-transmitting rod, not shown, this turning movement of the drive shaft 8 will be converted into an opening movement of the movable wing or wing/subject. The rotational movement of the drive shaft 8 causes, at the rotationally fixed coupling with the cam disc 9, a likewise rotational movement of this. The flat belt 10 is also pulled out of the spring housing 11 and unwound the cam disc 9. At the same time, the flat belt 10 pulls the spring plate 20 under compression of the closing spring 19, to the left in the drawing.

If the current to the drive motor 2 is interrupted, the tensioned closing spring 19 causes a movement of the spring plate 20 to the right in the drawing. The flat belt 10 fixed on the spring plate 20 is pulled into the spring housing 11 by the tensioned closing spring 19, whereby it is unwound from the cam disc 9 and causes a clockwise movement of the latter. The drive shaft 8, which is rotatably connected to the cam disc 9, also turns clockwise. Above the power-transmitting rod, not shown, this turning movement of the drive shaft 8 is converted into a closing movement of the movable wing or the door/subject. Above the drive device consisting of the screw 3 and the gears 4,6,7, the turning movement of the drive shaft 8 is converted into a turning movement of the motor shaft of the drive motor 2. The drive motor 2 can thereby act as a generator and thereby slow down the closing process.

In fig. 3 shows the attachment of the flat belt 10 to the cam pulley 9. The cam pulley 9 has a receiving opening 26 which is designed in the edge area of the cam pulley 9 as a hexagonal opening in the cam pulley 9. The cam pulley for the mounting opening 26 is rectangular and somewhat larger than the cross section of the flat belt 10. assembly of the drive device, the strap 24 of the flat belt 10 is pushed into the receiving opening 26 and fixed by means of a screw 25. The screw 25 can likewise even be omitted when, after a complete revolution of the cam disk 9 anti-clockwise, there is additionally a fixation of the overlapping layers of the flat belt 10 due to friction, so that the strap 24 of the flat belt 10 is thereby secured against slippage of the receiving opening 26 to the cam disc 9.

Fig. 4 and 5 each show the area of the spring housing 11 of the drive device in an enlarged version, and in two design examples for fixing the flat belt 10 on the spring plate 20. The spring plate 20 has a sleeve 27 with a centric bore, through which the flat belt 10 is guided. When assembling the drive device, the strap 29 of the flat belt 10 is passed through this bore. The strap 29 is then passed around a bolt 21 to form a loop 22 and again inserted into the bore of the sleeve 27, so that in the area of the bore in the sleeve 27 there are two layers of the flat strap 10 on top of each other.

In the embodiment in fig. 4, the bore in the sleeve 27 of the spring plate 20 is made with a constant cross-section. The overlapping layers of the flat belt 10 are fixed by means of two clamping jaws 23, which can be clamped against the bore of the sleeve 27 by an adjustable clamping screw 28 in the threaded bore of the sleeve.

In the embodiment in fig. 5, a clamping screw can also be omitted. The bore in the sleeve 27 tapers towards the inner space of the spring housing 11, whereby the two clamping jaws 23 are shaped complementary and chamfered with the narrowing of the bore. As the spring plate 20 is affected by the closing spring 19 on the right in the drawing, the clamping jaws 23 with the intermediate layers of the flat belt 10 are pressed against the tapered inner surface of the bore of the sleeve 23. A friction lock is provided and thereby fixing the flat belt 10 on the spring plate 20.

In both design examples, the loop 22 of the flat belt 10 with the bolt 21 lying in this is additionally prevented from slipping of the strap end 29 of the flat belt 10 from the spring plate 20.

Fig. 6 shows a further design example of the fixation of the flat belt 10 on the spring plate 20 in an enlarged version. The strap 37 of the flat strap 10 is clamped between the clamping surfaces 32,35 of two clamping jaws 30,33. The clamping trays 30,33 are always equivalent

shaped like half a truncated cone, so that in the assembled state, i.e. with clamping surfaces 32,35 lying one above the other and straps 37 lying between them, a truncated cone form is formed from the surface 31,34 to the clamping jaws 30,33, whereby the cross-section of the truncated the cone in the drawing rises slightly to the right. The spring plate 20 is annular, whereby its inner cross-section is larger than its smallest cross-section which is formed by the clamping jaws 30, 33 as a blunt cone and smaller than the largest cross-section of this blunt cone. The clamping is also achieved by the spring plate 20 being affected by the closing spring 19

is pressed to the right of the drawing, whereby it comes into contact with the surfaces 31,34 of the clamping jaws 30,32 and presses them together, whereby the strap 37 of the flat belt which lies between the clamping surfaces 32,35 is clamped. The clamping surfaces 32, 35 can exhibit a friction-increasing design of their surfaces, for example a rifle pattern, or a coating with high friction resistance. A ring 36 which is mounted in the area with the smallest cross-section of the obtuse cone formed by the clamping jaws 30,33 further secures the clamping connection.

Besides the obtuse cone shape of the clamping jaws 30, 36 described above, there are also other shapes, for example a wedge shape is conceivable.

Claims (15)

1. Drive device (1) for a leaf, especially a door leaf or a window sash, with an electric drive motor (2), with which the wing (1) can be driven in the opening direction over a drive shaft (8), with a closing spring (19) arranged in a housing (11), with which the wing can be driven in the closing direction over the drive shaft (8), whereby the opening of the wing takes place under the action of the drive motor (2) and thereby the closing spring (19) is biased, and whereby the closing of the wing takes place under the action of the closing spring (19), and with a flexible power transmission element for power transmission between the drive motor (2) and the closing spring (19), whereby the closing spring (19) is supported with one end on a stop arranged in the housing (11) and with its other end supported on a displaceably guided spring plate (20) in the housing (11), and whereby the power transmission element is arranged with its one end wrapped around the circumference of a cam disc (9) and with its other end fixed on the spring plate (20), characterized in that the power transmission element is designed as a flat belt (10). 2. Drive device according to claim 1, characterized in that the cam disc (9) has a receiving opening (26) for receiving a strap (24) for the flat belt (10). 3. Drive device according to claim 2, characterized in that the attachment of the flat belt (10) to the cam disc (9) is provided in such a way that the strap (24) is led into the intake opening (26) of the cam disc (9) and the intake opening (26) is covered by at least one additional layer of the flat belt (10). 4. Drive device according to claim 1, characterized in that the spring plate (20) has a sleeve (27) with an opening for receiving the second strap (29) of the flat strap (10). 5. Drive device according to claim 4, characterized in that the attachment of the flat belt (10) to the spring plate (20) is provided in such a way that the flat belt (10) can be fixed by means of at least one clamping jaw (23) in the opening of the sleeve (27). 6. Drive device according to claim 4, characterized in that the fastening of the flat belt (10) on the spring plate (20) is so shaped that the strap end (29) is led through the opening of the sleeve (27), that the strap end (29) while forming a loop (22) is passed around a bolt (21) and in the opposite direction is passed into the opening of the sleeve (27). 7. Drive device according to claim 6, characterized in that the cross-section of the opening in the sleeve (27) is tapered, whereby the clamping tray (23) is shaped in a complementary manner. 8. Drive device according to claim 6, characterized in that the clamping tray (23) can be fixed in the opening of the sleeve (27) by means of a clamping screw (28). 9. Drive device according to claim 1, characterized in that the spring plate (20) has an opening for receiving clamping jaws (30,33). 10. Drive device according to claim 9, characterized in that the clamping jaws (30,33) have clamping surfaces (32,35) facing each other, between which a strap (37) of the flat belt (10) can be clamped. 11. Drive device according to claim 9, characterized in that the clamping jaws (30,33) have outer surfaces (31,34) in the form of a truncated cone. 12. Drive device according to claim 11, characterized in that the spring plate (20) is provided in an annular shape, whereby the inner cross-section of the spring plate (20) is larger than the smallest cross-section of the obtuse cones formed by the clamping jaws (30,33) and smaller than the largest cross-section of the obtuse cone formed by the clamping jaws (30,33), so that the spring plate (20) rests against the outer surface of the clamping jaws (30,33) and that the strap end (37) of the flat belt (10) is clamped between the clamping jaws (30,33) ). 13. Drive device according to claim 9, characterized in that the clamping jaws (30,33) have wedge-shaped outer surfaces (31,34). 14. Drive device according to claim 1, characterized in that the stop arranged in the housing for the closing spring (19) is designed to be adjustable. 15. Drive device according to claim 14, characterized in that the stop arranged in the housing for the closing spring (19) is provided by means of a threaded sleeve (16) with an adjustable setting nut (18).