Electricity: motive power systems – Portable-mounted motor and/or portable-mounted electrical...
Reexamination Certificate
2000-12-06
2002-08-06
Dang, Khanh (Department: 2837)
Electricity: motive power systems
Portable-mounted motor and/or portable-mounted electrical...
C318S016000, C318S269000, C318S273000, C318S466000, C318S434000
Reexamination Certificate
active
06429609
ABSTRACT:
CROSS-REFERENCE TO RELATED ART. (NOT APPLICABLE)
STATEMENT REGUARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT. (NOT APPLICABLE)
REFERENCE TO A “MICROFICHE APPENDIX” (SEE 37 CFR 1.96). (NOT APPLICABLE)
DESCRIPTION
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a drive device, especially for moving and turning the slats of a blind in a runner, wherein the rotational movement of a drive wheel can be alternately transmitted to a turning drive means effecting the turning movement of the slats by means of a change gear and to a transport drive means effecting the movement of the slats in the runner, wherein the change gear comprises a drive tube, which can be driven in both directions of rotation via the drive wheel, and a shaped reversing shaft extending coaxially to the drive tube, which can be rotated by a certain angle relative to one another, and wherein the drive tube is connected to a drive for the transport drive means to rotate therewith via locking members arranged offset in the longitudinal and peripheral direction over its periphery in dependence on the angular position of the reversing shaft with respect to the drive tube in one shifting position and is connected to a drive for the turning drive means to rotate therewith in another shifting position.
2. Description of the Related Art Including Information Disclosed Under 37 CFR 1.97 and 1.98.
Such a drive device is known from DE-A 2 223 610. In this arrangement, a drive wheel, which can be operated by a cord or chain pull, rotates a drive tube with which it is engaged. In the wall of this drive tube radially movable locking members are provided, offset with respect to one another both in the peripheral and in the longitudinal direction, which, depending on the position of a shaped shaft, which can also be rotated by the drive wheel via a driving device within the drive tube, are held in engagement with one of two toothed sleeves arranged behind one another on the drive tube or can be moved out of the area of engagement with the respective other toothed sleeve. A turning shaft effecting the turning of the slats can be driven via one of the two toothed sleeves and a transport spindle effecting the movement of the slats can be driven via the other one. By changing the direction of rotation at the drive wheel, the blind can thus be pulled open and shut by means of the longitudinal displacement of the slats, on the one hand, and, on the other hand, brought into a position allowing more or less light to pass in a state in which the blind is pulled shut wholly or partially, that is into a wholly or only partially closing position, by turning or rotating the slats around their longitudinal axis.
Since the blind cannot be pulled open, i.e. the slats cannot be pushed together not, without interference when the slats are in their completely closing turning position because they then abut one another, a further development of the said gear ensures that each directional change at the drive wheel is followed by a turning or rotating of the slats and the turning shaft is decoupled at the gear and the drive is shifted to the transport spindle only after a certain angle of rotation has been reached which goes beyond the closing of the slats.
Shifting from one shifting position to the other one is effected by a limited relative rotation between the drive tube and the shaped shaft and this relative rotation is made possible by a toothed disk which is permanently joined to the shaped shaft and has mirror-inverted locking teeth on both sides, with a driving and a sliding edge, which, on one side, can lock in to a notched disk permanently joined to the drive wheel and, on the other side, into a second notched disk permanently joined to the drive tube, wherein the drive tube, after the locking, is entrained by driving tabs which protrude into arc-shaped slots of the drive wheel and allow a relative rotation of the drive wheel with respect to the drive tube. The individual parts of the mechanical shifting arrangement are exposed to high torques and surface pressures during the operation which can lead to premature wear and also to disturbances due to jamming. To ensure as trouble-free operation of these drive devices as possible, it is necessary to maintain very small production tolerances in the parts of the mechanical shifting arrangement, which makes production more expensive.
Moreover, it has been found in practical application that the shifting process which is subdivided into a number of part-processes, and which requires a brief turning back and forward at the drive wheel with each shifting process for example, is considered to be too complicated by most users. Because of this complicated shifting process, this drive device is also not very suitable for an electric motor drive.
In DE 2 737 416 C2 and DE 25 54 991 B2, a gear is described in which the shaped shaft described above is held in a central rest position with respect to the drive tube, or always returned to this position in which the locking members, which can be radially moved in the drive tube, are held in engagement with the toothed sleeve via which the turning shaft is driven, by a restoring spring so that, when the drive wheel is turned, initially it is always the turning shaft which is first driven and, as a consequence, the slats are rotated, i.e. turned, around their longitudinal axis. At the transport spindle, a free run, limited in both directions by a roller and by a stop, is provided which allows a next toothed sleeve meshing with the second tooth sleeve driven by the drive tube to rotate loosely on the transport spindle up to the end of the free run. At the end of the free run, a non-positive connection is obtained between the transport spindle and the toothed sleeve which rotates loosely on the former up until then, so that the transport spindle is now entrained in the rotation. Due to the higher torque to be transmitted by the drive tube during this process, the shaped shaft is pivoted against the force of the restoring spring inside the drive tube and relative to the latter by a driving device, to such an extent that, as a result, the toothed sleeve driving the turning shaft is decoupled.
The transport spindle which is now coupled on alone effects the movement of the slats in the runner. The angle at which the slats are positioned with respect to the running direction here always corresponds to one of the end turning positions of the slats and is determined by the length of the free run; it is approx. 150° in both directions. To ensure the shifting from turning to moving, a braking device which can be adjusted by means of an adjusting screw is also provided on the free-run shaft, by means of which the higher torque required for the shifting can be increased again.
While the drive wheel can also be driven by electric motor instead of with the aid of a cord or chain pull in this case, the shifting from drive to the turning shaft to drive to the transport spindle is done purely mechanically. Because of the large torques occurring during this process, individual parts, especially of the limited free run in its end positions, are subject to high loading. The forces and surface pressure occurring during this process can lead to wear and also to jamming as a consequence of production tolerances. In addition, it is no longer possible subsequently to change or adapt the number of idle rotations between the toothed sleeve and the transport spindle driven by it.
It has also been found that, in spite of the angular position of the slats of 150° with respect to the running direction during the movement of the slats, the latter tend to become hooked together, especially if they are loosely connected to one another by beaded strings at their freely suspended ends or if the runner is attached to an inclined surface, for example a roof slope. The slats also require a relatively large amount of space on the side, e.g. of a window, in the pushed-together state, that is to say when the blind is open, with an angular position of approx. 150°.
BRIE
Dang Khanh
Kasper Horst M.
Trietex Antriebstechnik GmbH
LandOfFree
Drive device, especially for moving and turning the slats of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drive device, especially for moving and turning the slats of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drive device, especially for moving and turning the slats of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2914346