Pivot-hung door drive

Details Pivot-hung door drive Pivot-hung door drive

2000-01-13

2002-01-15

Estremsky, Sherry (Department: 3661)

Interrelated power delivery controls, including engine control

Electric engine

C074S462000, C049S340000

Reexamination Certificate

active

06338693

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pivot-hung door drive system with an electro-mechanical or electro-hydraulic device that supplies the opening and closing moment required to open and close a connected pivot-hung door panel.
2. Background Information
German Patent No. 41 24 282 C2 describes a pivot-hung or swinging or swiveling door drive system in which the connected door is automatically opened electro-mechanically by the pivot-hung door drive system. The closing process is carried out with the assistance of the motor drive by an integrated closing spring which can be located in a commercially available door closer, for example. In that case, a reduced drive moment is applied to the motor drive, whereby the motor only makes up the losses in the gear train. This type of control eliminates the need for a continuous engagement of the coupling, and simultaneously results in reduced wear, because the coupling does not need to be re-engaged for the reversing process of the pivot-hung door. This pivot-hung door drive system is equipped with a scissors-type linkage.
Such a drive system can be installed on the door frame or on the door. In addition to the scissors-type or pantograph linkage described above, a parallel linkage and a slide rail in connection with a straight actuator arm can also be used. While the closing moments for scissors-type and parallel linkages are sufficient for standard tasks, the closing moments or movements for the closing process are generally very low when a slide rail is used.
German Patent No. 37 30 114 A1 describes a device for opening and closing doors that consists of two mounting parts. The one part is fastened to the door leaf and the other part of the device is fastened on the frame side, whereby the two mounting parts are connected to each other by a force transmission mechanism. At the same time, there is a reversing mechanism with a locking coupling, which simultaneously limits the forces to be transmitted. For this purpose, conventional, commercially available door closers can be used, although they must have a closing spring. The drive wheel of the device, which is connected on one end with the force transmission mechanism, has a pinion which is effectively connected with a rack.
WO 89/11578 describes a drive system for a pivot-hung door that operates in a similar fashion. In this case, there is a device for the opening process, and the closing process is accomplished, as in DE 41 24 282 C2, by the force of a door closer.
Similar drive systems for pivot-hung doors are described in U.S. Pat. No. 1,684,704 and U.S. Pat. No. 2,256,613. There again, drive systems are described in connection with door closers, although the door closer is installed as a separate component on the door panel, and the drive system for the pivot-hung door is located above the door panel. The connection between the drive system for the pivot-hung door and the door closer is in the form of a scissors-type linkage. U.S. Pat. No. 4,333,270 discloses a drive system for a pivot-hung door that works electro-magnetically. In this case, a drive wheel interacts with a rack, so that a spring for the closing of the door is stretched during the opening process.
German Patent No. 32 02 930 A1 discloses an electro-mechanical pivot-hung door drive system that uses a direct-current motor in connection with a planetary gear train for the drive system. There is a toggle lever linkage between the output shaft and the connected door. This drive system for a pivot-hung door is used for both the opening process and the closing process of the door to which it is connected.
An advertising brochure published by DORMA GmbH+Co. KG describes an electro-hydraulic drive system designated Model ED 200 designed for use with a pivot-hung door. The drive system in question is a compact drive unit that opens the door against the force of a spring and mechanically returns the door to the closed position using the restoring forces of the spring. This drive system can thereby be installed on the door frame or on the door. In this system, an electric motor drives a pump which pumps a corresponding volume of oil into a hydraulic cylinder, which in turn expands against the force of a spring. The piston of the hydraulic cylinder is thereby provided with gear teeth that drive a pinion, to which the lever mechanism that actuates the door is attached. To return the door to the closed position, appropriate valves are opened and the volume of oil can flow back into the reservoir of the drive unit. The spring thereby pushes the piston back and closes the door by its movement, which is transmitted to the pinion.
OBJECT OF THE INVENTION
One object of the present invention is therefore to improve a pivot-hung door drive system described in some publications so that, to avoid the above-mentioned disadvantages, an essentially simple construction and an essentially easy adaptation to the desired torque curves over the opening angle become possible.
SUMMARY OF THE INVENTION
The object can be accomplished, in at least one embodiment according to the present invention, in a pivot-hung door drive system, in which there can be a device that effects a change in the opening and closing moment over the angle of rotation of a corresponding pivot-hung door panel. Additional possible embodiments of the present invention are described in the features shown herein.
The present invention teaches that the force curve/torque curve that changes over the opening angle of a door or swivelling panel can be influenced during both the opening and the closing of the door by means of a transmission in the form of a device with a translation ratio that varies over the opening angle, which translation ratio can substantially easily be achieved by easily manufactured eccentrically located gear wheels that have a circular gear rim.
The present invention therefore teaches a transmission that varies its translation ratio over the opening angle or angle of rotation of the door and can have a first and a second gear wheel that are engaged with each other and are each formed by a circular gear rim, which gear wheels are mounted so that they retain their axial separation eccentrically with respect to their center points. The first gear wheel can be connected with an output shaft and the second gear wheel can be connected with a gear wheel of the drive device, whereby the axis of rotation of the output shaft runs through the center of motion of the first gear wheel, and whereby essentially everything is arranged so that the eccentricity of the gear wheels that results from the center point of a gear wheel and the new center of motion lies substantially centrically symmetric or point-symmetric to their pitch point.
The torque curves can then be substantially easily defined and determined by the selection of the eccentricity, the pitch circle diameter and the resulting distance between the axes of rotation of the two gear wheels. Many different translation ratios can thereby become possible, and thus the ability to adapt the system to the desired torque characteristic over the opening angle, without the need to manufacture special cam plates.
Instead, the present invention teaches that commercially available gear wheels can be used, which can significantly reduce the manufacturing costs. The gear wheels can in particular have standard gearing or gear design.
The magnitude of the eccentricity can be described by the ratio of the magnitude of the eccentricity to the base circle diameter. In particular, this ratio should not exceed a ratio value of 0.137 for gearings according to DIN 867. The transmission action of the transmission, however, deteriorates significantly when this value is exceeded, because the profile overlap can drop below 1.
In one embodiment of the present invention, the pivot-hung door drive system can be realized in the form of a top-mounted drive with a lever arm which effectively varies over the range of rotation between a coupling point of the swinging door panel and another coup

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