A CURTAIN DRAWING DEVICE

Abstract: A curtain rod or rail (6) is provided with a spiral convex (7) on the allover outer circumference thereof with opposite windings at the both ends of the rod, on which rings (8) are mounted for suspend­ ing a curtain (9) and movable over the spiral convex (7). The rail is rotatably driven by an electric motor (2), and the rings (8) run idle thereon, though the curtain is closed or opened while the motor is still runningf so that no overload is not effected on the electric motor (2).

Description: The invention relates to a curtain drawing device, comprising an automatic release device for a curtain tassel band. There are known curtain drawing devices with an electric driving motor connected to the curtain via a rotatable curtain rail which has a convex spiral guide element on its circumferencial surface (FR-A-15 29 629, FR-A-12 88 176). They avoid any excess load of the driving motor as the motor and the curtain are not connected directly e.g. by a wire and they also permit the curtain to be drawn by hand. However, if the curtains are bundled by conventional tassel bands, the automatic curtain drawing system can only be used after the tassel band has been released by hand. This fact degrades the merits of the curtain drawing system. US-A-1 900 677 discloses a switch assembly for controlling reversible electric motors driving cables which are connected to the lower edge of a stage curtain for raising and lowering the curtain. The switch assembly comprises a slidable armature biased by a spring and an electro-magnet or solenoid that will attract the armature against the spring tension when energized, thereby closing the switches of the assembly to energize the motor. It is the primary object of the invention to provide a curtain drawing device having means for automatically releasing the tassel band when the curtain shall be drawn by a motor. It is another object of the invention to provide a simple curtain drawing structure for easy operation which permits automatic operation by remote control. Preferred embodiments of the invention will be described in connection with the drawings. Fig. 1 is a perspective view of a main part of an electric curtain drawing device according to the invention; Fig. 2 is a side view, partially in section, showing the relation between a rail and a ring of the electric curtain drawing device; Fig. 3 and 4 are block diagrams of the electric control circuits; Fig. 5 is a perspective view of an automatic release system of a curtain tassel band; Fig. 6 is a side view, partially in cross section, showing a using condition of the system of Fig. 5; and Figs. 7 and 8 are block diagrams of the electric control circuits of the release system. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION The reference numeral 1 designates a cover, 2 is an electric motor, 3 is a reduction gear, 4, 5 are bearings, and 6 is a rail. The electric motor 2 and the reduction gear 3 are connected and the latter's output shaft is connected to the rail 6. The rotation of the motor 2 is reduced by the reduction gear 3 for rotating the rail 6. The reduction gear 3 is secured to the bearing 4, and the bearings 4 and 5 are fixed to a window frame by screwings 4a and 5a. The rail 6 is rotatably pivoted by the bearings 4 and 5. The rail 6 is provided on the outer circumference thereof with a convex 7 which is formed by spirally winding, e.g., a spring material circular in cross section, and rings 8 are positioned as runners between the convexs 7. The ring 8 is circular in cross section, and its inner diameter is larger than the outer diameter of the rail 6, so that the ring 8 may be manually moved over the convex 7 of the spring material. A curtain 9 is suspended from the rings 8. 10 is a plug for a power source, and 11 is a box for a remote control. A further reference will be made to the function of the device. When the electric motor 2 rotates, the reduction gear 3 reduces the rotation speed for rotating the rail 6, so that the convex 7 on the outer circumferece of the rail rotates at the same reduced speed, and the ring 8 follows the convex 7 for opening and closing the curtain 9. Fig. 3 shows the block diagram of the electric relation for using a wireless remote control where a microcomputer is employed and an alarm function is added for opening or closing the curtain at desired times. Figs. 5 to 8 show an automatic release system of a curtain tassel band. In Figs. 5 and 6, the reference numeral 12 is a tassel band, where a hook 13 holds a ring 14 connecting a fixing pin 15 and the other hook 13 is caught on a pin 22. A solenoid 17 is incorporated in a tassel holder 16, and has a movable shaft 19 which is pressed moderately to the lower part of the tassel holder 16 by a spring 18. The fixing pin 15 is inserted in a hole 21 and secured by the movable shaft 19. The movable shaft 19 is biased upward by an external electric signal, and the fixing pin 15 slides down on an appropriate obliquity of a fixing pin receipt 20 due to its own weight, and releases the bundled curtain 9. Figs. 7 and 8 show electric block diagram for exerting a wireless remote control, where the solenoid is actuated by the microcomputer for automatically drawing the curtain at a place further apart. According to the present invention, the electric motor and the curtain are connected not directly but via the rotatable rail and the rings movable axially with respect to said rail. Therefore, when the curtain is closed or opened, the rings run idle on the rail and the motor is not effected with unnecessary overload so that noises are not caused and the machine is not damaged. In addition, the curtain may be opened and closed both automatically and manually. The curtain may be released from the tassel band by energizing the solenoid by the external electric signal.

Claims: 1. A curtain drawing device, comprising an automatic release device for a curtain tassel band (12), wherein the tassel band (12) has first and second hooks (13) for hooking the band on a tassel holder (16), the first hook (13) holding a ring (14) to which a fixing pin (15) is connected, and the second hook (13) being caught on a pin (22) of the tassel holder (16); a solenoid (17) incorporated in the tassel holder (16) has a movable shaft (19) which is biased downward to the lower part of the tassel holder (16) by a spring (18) and is biased upward by the solenoid (17) if the latter is energized by an external electric signal, said movable shaft (19) extending in a hole (21) of the tassel holder (16) for securing said fixing pin (15) which is inserted in said hole (21); and the fixing pin (15) is adapted to slide down on an obliquity of a fixing pin receipt (20) due to own weight if said movable shaft (19) is biased upward for releasing a bundle of the curtain (9). 2. Device according to claim 1 wherein the solenoid (17) is actuated by a switch and/or by a microcomputer circuit controlled by a wireless remote control device. 3. Device according to claim 1 or 2 wherein the curtain (9) is held by rings (8) mounted on a rotatable curtain rail (6) having a convex spiral winding (7) on its surface for moving said rings (8) for opening and closing the curtain (9), said rail (6) being driven by an electric motor (2).

Inventors: SHIMAZAKI, FUMIO
Applicants: TOPIA INDUSTRY CO., LTD
Application year: 1988
Main classification: A47H5
IPC codes: A47H5