SCROLLING UNIT FOR ELECTRIC WINDOW CURTAIN

Abstract

A window curtain includes a top rail, a bottom rail and a curtain between the top and bottom rails. A transmission unit and a scrolling unit are received in the bottom rail. Transmission unit includes a control member, a motor, and a shaft connected to the motor. The scrolling unit includes a case in which a passive part, a first prat and a second part are accommodated. The shaft of the motor drives the scrolling unit. A first rope is connected to the first part. A second rope is connected to the second part. The first and second ropes pass through the curtain and are connected to the top rail via the first and second transition members. The transmission unit and the scrolling unit are received in the bottom rail to reduce the weight of the top rail, and are easily maintained.

Claims

1. A window curtain comprising: a top rail; a bottom rail; a curtain connected between the top rail 1 and the bottom rail; a transmission unit located in the bottom rail and including a control member, a motor, and a shaft, the shaft connected to the motor, the control member controlling operation of the motor; a scrolling unit located in the bottom rail and including a case in which a passive part, a first prat and a second part are accommodated, the passive part including a bevel gear and a spur gear which is co-rotated with the bevel gear, the shaft extending into the case and connected to a driving gear, the driving gear engaged with the bevel gear, the spur gear located beneath the bevel gear; the first part including at least one first gear, a first spool and a first rope, the at least one first gear engaged with the spur gear, the first rope wrapped to the first spool, an end of the first rope passing through a first transition member and the curtain, and fixed to a first end of the top rail; the second part including at least one second gear, a second spool and a second rope, the at least one second gear engaged with the at least one first gear, the second rope wrapped to the second spool, an end of the second rope passing through a second transition member and the curtain, and fixed to a second end of the top rail, and the first transition member and the second transition member respectively located to two ends of the bottom rail, the first transition member and the second transition member having identical structure and located symmetrically to each other, each of the first transition member and the second transition member including a first rod and a second rod, the first rod being perpendicular to the bottom rail, the second rod being parallel to the bottom rail, the first/second rope wrapped to the first rod and turning 90 degrees to be wrapped to the second rod, and the first/second rope passing through the curtain and fixed to the top rail.

2. The window curtain as claimed in claim 1, wherein the transmission unit includes a power supply which is electrically connected to the motor.

3. The window curtain as claimed in claim 2, wherein the power supply includes a box and a rechargeable battery is received in the box.

4. The window curtain as claimed in claim 1, wherein the control member of the transmission unit is controlled by a wireless remote controller so as to activate the motor.

5. The window curtain as claimed in claim 1, wherein the bottom rail includes a bottom plate and a housing, the bottom pate is connected to the housing to form a room between the housing and the bottom plate, the transmission unit, the scrolling unit, the first transition member and the second transition member are located in the room between of the housing and the bottom plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a perspective view to show the electric window curtain of the present invention;

[0018] FIG. 2 is an exploded view of the electric window curtain of the present invention;

[0019] FIG. 2A is an enlarged view to show the transition member;

[0020] FIG. 3 is a perspective view to show the scrolling unit of the present invention;

[0021] FIG. 4 is an exploded view to show the scrolling unit of the present invention;

[0022] FIG. 5 shows that the scrolling unit releases the ropes to lower the curtain;

[0023] FIG. 6 shows that the scrolling unit wraps the ropes to lift the curtain;

[0024] FIG. 7 shows the power supply of the present invention, and

[0025] FIG. 8 shows that the power supply is electrically connected to the motor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0026] Referring to FIGS. 1 to 8, the electric window curtain of the present invention comprises a top rail 1, a bottom rail 2, a curtain 3 connected between the top rail 1 and the bottom rail 2, a transmission unit 4, a scrolling unit 5, a first transition member 6 and a second transition member 7.

[0027] The top rail 1 includes a U-shaped cross section and connected to the top edge of a window. The transmission unit 4, the scrolling unit 5, the first transition member 6 and the second transition member 7 are received in the bottom rail 2 so that the top rail 1 is easily installed. The transmission unit 4 and the scrolling unit 5 lift or lower the curtain 3.

[0028] As shown in FIGS. 1 and 2, the bottom rail 2 includes a bottom plate 21 and a housing 22. The bottom pate 21 is connected to the housing 22 to form a room between the housing 22 and the bottom plate 21. The transmission unit 4, the scrolling unit 5, the first transition member 6 and the second transition member 7 are located in the room between of the housing 22 and the bottom plate 21.

[0029] The curtain 3 can be a comb-shaped curtain in this embodiment, other types of curtains can also be used, such as blinds or Roman shade.

[0030] As shown in FIGS. 2, 7 and 8, the transmission unit 4 includes a control member 41, a motor 42 and a shaft 43. The shaft 43 is connected to the motor 42. The control member 41 controls operation of the motor 42, such as number of revolutions and rotational directions. The shaft 43 of the motor 42 is connected to the scrolling unit 5. The transmission unit 4 includes a power supply 44 which is electrically connected to the motor 42. The power supply 44 includes a box 442 and a rechargeable battery 441 is received in the box 442. A cover 443 is connected to the box 42 to accommodate the re rechargeable battery 441 in the box 442. When an electric power outage happens, the curtain 3 can also be operated by the power from the rechargeable battery 441.

[0031] As shown in FIGS. 2 to 6, the scrolling unit 5 located in the bottom rail 2 and includes a case 51 in which a passive part 52, a first prat 53 and a second part 54 are accommodated. The passive part 52 includes a bevel gear 521 and a spur gear 522 which is co-rotated with the bevel gear 521. The shaft 43 extends into the case 51 and is connected to a driving gear 431. The driving gear 431 is engaged with the bevel gear 521, and the spur gear 522 is located beneath the bevel gear 521.

[0032] The first part 53 including at least one first gear 531, a first spool 532 and a first rope 533. The at least one first gear 531 is engaged with the spur gear 522. One of two ends of the first rope 533 is wrapped to the first spool 532, the other one of the two ends of the first rope 522 passes through the first transition member 6 and the curtain 3, and is fixed to the first end of the top rail 1.

[0033] The second part 54 includes at least one second gear 541, a second spool 542 and a second rope 543. The at least one second gear 541 is engaged with the at least one first gear 531. One of two ends of the second rope 543 is wrapped to the second spool 542, and the other one of the two ends of the second rope 542 passes through the second transition member 7 and the curtain 3, and is fixed to the second end of the top rail 1.

[0034] As shown in FIGS. 1 and 2, the first transition member 6 and the second transition member 7 are respectively located to two ends of the bottom rail 2. The first transition member 6 and the second transition member 7 have identical structure and are located symmetrically to each other. Each of the first transition member 6 and the second transition member 7 includes a first rod 61/71 and a second rod 62/72. The first rod 61/71 is perpendicular to the bottom rail 2. The second rod 62/72 is parallel to the bottom rail 2. The first/second rope 533/543 is wrapped to the first rod 61/71 and turns 90 degrees to be wrapped to the second rod 62/72, and the first/second rope 533/543 passes through the curtain 3 and is fixed to the top rail 1.

[0035] The top rail 1 is light and easily to be installed because the transmission unit 4, the scrolling unit 5, the first transition member 6 and the second transition member 7 are located in the bottom rail 2. In addition, the transmission unit 4 and the scrolling unit 5 are easily maintained in the bottom rail 2.

[0036] The curtain 3 can also be operated by the power from the rechargeable battery 441 when an electric power outage happens.

[0037] The control member 41 of the transmission unit 4 is controlled by a wireless remote controller (not shown) so as to activate the motor 42.

[0038] When in use, the shaft 43 drives the passive gear 52 of the scrolling unit 5, and the first part 53 and the second part 54 are co-rotated to scroll or release the first and second ropes 533, 543 to lift or lower the curtain 3. Besides, the scrolling unit 5 is transversely installed so that the first and second ropes 533, 543 are not likely entangled with other.

[0039] While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.