Flexible or portable closure – partition – or panel – Roll type – With fabric free edge connected operator
Patent
1997-06-24
1999-06-29
Johnson, Blair M.
Flexible or portable closure, partition, or panel
Roll type
With fabric free edge connected operator
160319, 16037022, A47G 502
Patent
active
059154470
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an operating arrangement for an electrically operated window screening device of the type comprising a screening body which in a non-active position (unscreened window) is rolled up on a roller or is folded in or at an upper horizontal main frame or sash member for the window and in a free end is connected with a bottom rail extending in the width of the window, which operating arrangement, for moving the screening body in one direction, comprises a cord or string-formed pull-element acting on the screening body and being wound on a winding device positioned at a lower main frame or sash member and with an accompanying electrical drive motor.
Such a device is known in the form of a roller shutter from the German patent No. 32 14 235. The rolling out of the roller shutter discussed in this patent is effected by means of the gravitational force and the rolling up is made by the electrical drive motor causing a winding of the pull-element on the winding device.
This known operating arrangement is thus used only in restricted areas since it is not suitable for other forms of screening devices such as roller blinds where it is the unrolling movement which is driven by motor, or tilted screening devices where the gravitation component in the unrolling direction is small as it is e.g. the case with roof windows. Besides, this operating device requires a special design of the roller in the upper main frame or sash member and of the cord routing.
Therefore, the purpose of the invention is to provide an improved and simplified operating device of the initially stated kind such that it may be applied to other types of screening devices.
In order to secure this end, the operating arrangement according to the invention is characterized in that for moving the screening body in a direction of unrolling or unfolding, the pull-element is from the winding device guided along both opposite main frame or sash side members of the window for connection with said bottom rail, whereas the movement of the screening body in the opposite direction of rolling up or folding or folding is in a manner known per se effected by means of a spring force acting in said direction of rolling up or folding during simultaneous dewinding of the pull-element from the winding device.
Thus, a simple and secure operation of the screening device is ensured, and the guidance of the pull-element along the sides of the window entails that the entire visual field remains unaffected.
In an embodiment especially suitable for use in connection with existing screening devices, the pull-element is connected with a separate bar profile designed for after-mounting on a bottom rail for the screening device already installed.
The pull-element may be designed either as two separate draw cords or strings fastened in each end of the bottom rail or the separate bar profile or as a single draw cord guided through the bottom rail or the separate bar profile in their entire length.
In a preferred embodiment, the winding device comprises, as it is known per se from SE patent No. 222 909, two drum parts for each end of said one draw cord or for each of said draw cords or strings, and the drum parts are preferably designed as threaded portions with opposite lead directions on a common drum surface and each in engagement with its nut member acting as a control member for the winding of a draw cord in the bottom of the threads on each drum part. There is thus obtained a structure in which the driving shaft is non-displaceable in the axial direction, no particular demands being made, among other, on the bearing of the shaft, and at the same time, the winding of the draw cord in the bottom of the threads prevents that the screening device is pulled up askew.
As a special advantage, there may in connection with the drive motor be provided an end stop device functioning during movement of the screening body in the unrolling direction and/or the rolling up or pulling direction, said device is active both when the screening device strikes its end positions an
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patent: 550668 (1895-10-01), Li
patent: 4494707 (1985-01-01), Niibori et al.
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patent: 5404926 (1995-04-01), Ojima et al.
patent: 5515898 (1996-05-01), Alcocer
patent: 5620039 (1997-04-01), Delgado et al.
Johnson Blair M.
V. Kann Rasmussen Industri A/S
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