The invention relates to a door drive with a motor-gear-unit and with a spring, which acts as an energy accumulator.
With a swing leaf door drive there are basically two possibilities for the transmission of the driving power of the door drive onto the door leaf: a scissor arm assembly and a slide channel arm assembly, respectively, arrangements derived therefrom having comparable principles of action. Depending on the installation situation, it is recommended to use one or the other transmission mechanism. However, the momentum curve progressions at the door, required for the self-closure according to standards, call for different shaft momentum curve progressions changing over the door opening angle with each transmission mechanism, such that, depending on the transmission mechanism, different motor-gear-units need to be employed as well. This however causes high expenses in structural components and leads to creating a multitude of variants.
Therefore, it is the object of the present invention to provide a door drive, in which exchanging a single structural component creates two variants for scissor arm assemblies, respectively for slide channel arm assemblies. A maximum amount of equal components is thereby achieved.
This problem is solved through a door drive with a motor-gear-unit and with a spring, acting as an energy accumulator, wherein the pre-loading of the spring can be actively changed through the motor-gear-unit.
As a result of this embodiment, one and the same door drive can be employed for both transmission mechanism types. Depending on the selected transmission mechanism, just the pre-loading of the spring needs to be adapted correspondingly.
The dependant claims include advantageous further developments of the invention.
According to an advantageous further development, the spring bears against an abutment and the change of the pre-loading of the spring is made through changing the position of the abutment.
Advantageously, the motor-gear-unit has at least one toothed wheel meshing with a toothed rack.
According to a preferred embodiment, the toothed wheel consists of two parallel toothed discs and a hub disposed therebetween.
Advantageously, the hub has a contour that varies over the radius.
According to an advantageous configuration, the toothed rack has a slot extending in the longitudinal direction thereof.
According to an advantageous further development, a traction means is fastened to the hub, which means extends between the two toothed discs of the toothed wheel, through the slot in the toothed rack, and through the inside of the spring and is fastened to the abutment.
According to a preferred configuration, the structure is configured in that a rotation of the toothed wheel will cause a winding, respectively unwinding of the traction means, which in turn effects the adjustment of the abutment.
Furthermore, the traction means is advantageously guided via a return pulley, which is disposed between the hub and the toothed rack.
According to an advantageous further development, an additional transmission or reduction ratio can be an integral part of the return pulley, if necessary with a variable radius.
As an alternative to adjusting the abutment via a traction means, according to an advantageous configuration, a threaded spindle maybe disposed at the abutment, which spindle can be driven via the motor-gear-unit such that the abutment can be adjusted directly by the motor-gear-unit.
Further details, features and advantages of the invention will become apparent from the following description, reference being made to the drawing.
The sole FIGURE shows the basic structure of the inventive door drive.
The inventive electro-mechanically driven door drive has a motor 1, which is in operational connection with a toothed wheel 2. The toothed wheel 2 consists of two toothed discs 3, 4 which are parallel to each other and are connected to each other by means of a hub, which hub has a contour with a variable radius. Thus a slot is formed between the two toothed discs 3, 4.
The toothed wheel 2, respectively the two toothed discs 3, 4 are meshing with a toothed rack 5, which is provided with a slot 6 extending in the longitudinal direction.
The spring 7 is supported in a housing 9, which, in the illustrated exemplary embodiment, extends parallel with regard to the longitudinal axis of the motor 1.
Furthermore, a return pulley 10 is provided, which is disposed between the toothed wheel 2 and the toothed rack 5.
A traction means 11 is attached at the hub between the two toothed discs 3, 4, which means is guided in the slot between the two toothed discs 3, 4, extends thereafter over the return pulley 10, through the slot 6 in the toothed rack 5 and through the spring 7 and so far as to the abutment 8 and is attached to the latter.
An additional transmission or reduction ratio can be integral part of the return pulley 10.
By off-setting the centers of the toothed rack 5 and of the spring 7, if necessary, the slotting may be foregone, or with a variable radius.
The inventive door drive is designed for the use with either a scissor arm assembly or with a slide channel arm. The torque characteristics are modified through a change of the pre-loading of the spring 7 effected by the motor 1. In the illustrated exemplary embodiment, this is realized through a rotation of the toothed wheel 2, whereby the traction means 11 is wound onto, respectively unwound from a hub having a variable diameter, whereby the abutment 8 of the spring 7 is adjusted. Thus the pre-loading of the spring 7 is likewise changed. On account of the contour of the hub, that has a variable radius, the torque characteristics can be controlled and adapted to the respective transmission mechanism (scissor arm assembly or slide channel arm). Thus these drive variants exclusively differ through the employed hub with the corresponding contour.
Instead of the above described procedure, the pre-loading of the spring 7 can be changed via a toothed wheel that is integral of the gear, via the output shaft of the door drive that is connected to a closer shaft, or through a spring abutment disposed on a threaded spindle, the drive thereof being effected via the motor 1 or via a gear shaft. However, on account of the fixed coupling between motor rotation and spring adjustment, it is not possible to create variants with the above configuration.
Number | Date | Country | Kind |
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10 2006 026 008.2 | Jun 2006 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2007/003836 | 5/2/2007 | WO | 00 | 12/29/2008 |