COUNTERBALANCED BLIND
A counterbalanced blind has a top frame, a bottom bar, a shade mounted between the top frame and the bottom bar, a reel device, two roller devices and two cords. The reel device is mounted in the top frame, and the two roller devices are mounted on the opposite side of the reel device in the top frame. The cords are wound and fastened in the reel device, respectively extend in opposite directions to the roller devices, pass downward through the shade and are fastened on the bottom bar. The bottom bar can be raised or lowered and position of the bottom bar will be retained after releasing the bottom bar.
1. Field of the Invention
The present invention relates to a blind, and more particularly to a counterbalanced blind that can be operated easily without a pull string.
2. Description of Related Art
For shielding off sunshine or external light, windows are usually provided with blinds or shades. A conventional blind generally has a top frame, a bottom bar, a shade and a control device. The top frame is mounted securely on a wall or a ceiling. Two sides of the shade are respectively fastened to the top frame and the bottom bar. The control device is mounted in the top frame and has a pull string that is hung beside the top frame. When the pull string is parallel to the blind, the control device is locked and the shade is held at a predetermined height. When the pull string is obliquely, the control device is released and the bottom bar is free to move and the shade may be concertinaed or spread out to control amount of light entering a room.
However, when the top frame is hung relatively high compared to a person controlling the blinds, for example when wheelchair users or children are operating the blind or when the blind is hung high due to a large window, high ceiling or use on stairwells, positioning the pull string sufficiently obliquely to release the bottom bar and the shade may be difficult. Furthermore, the pull string may be dangerous to young children and pets, especially threat by strangulation or entanglement.
Therefore, the present invention provides a counterbalanced blind to overcome the aforementioned problems.
SUMMARY OF THE INVENTIONAn objective of the invention is to provide a counterbalanced blind that can be operated easily without a pull string.
The counterbalanced blind has a top frame, a bottom bar, a shade mounted between the top frame and the bottom bar, a reel device, two roller devices and two cords. The reel device is mounted in the top frame, and the two roller devices are mounted on the opposite side of the reel device in the top frame. The cords are wound and fastened in the reel device, respectively extend in opposite directions to the roller devices, pass downward through the shade and are fastened on the bottom bar. The bottom bar can be raised or lowered, and position of the bottom bar is retained after releasing the bottom bar.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
The top frame (10) is mounted on walls or ceilings, especially adjacent to windows. With reference to
The two roller devices (4) are mounted separately in the top frame (10), and each roller device (4) has a first roller (41), a second roller (42), and an optional bracket (40). The first roller (41) and the second roller (42) are rotatably mounted on the bracket (40) that is mounted in the top frame (10).
With further reference to
With reference to
With reference to
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims
1. A counterbalanced blind comprising:
- a top frame (10);
- a bottom bar (20);
- a shade (30) mounted between the top frame (10) and the bottom bar (20);
- two roller devices (4) mounted separately in the top frame (10) and each roller device (4) having a first roller (41) rotatably mounted in the top frame (10); a second roller (42) rotatably mounted in the top frame (10);
- a reel device (5) mounted between the two roller devices (4) in the top frame (10) and comprising a first reel (51) rotatably mounted in the top frame (10) and having a first gear (511) formed thereon; a second reel (52) rotatably mounted in the top frame (10), having a second gear (521) formed thereon, and the second gear (521) meshing with the first gear (511); a resilient member (53) mounted on the first reel (51) and connecting the first reel (51) with the second reel (52); and
- two cords (60), one of the cords (60) fastened and wound on the first reel (51), and the other cord (60) fastened and wound on the second reel (52), the cords (60) respectively extending in opposite directions through the roller devices (4), each cord (60) wound on the first roller (41) and the second roller (42) of the roller device (4), passing through the shade (30) and fastened to the bottom bar (20) to counterbalance forces added on the roller device (4).
2. The counterbalanced blind as claimed in claim 1, wherein each cord (60) is wound on the first roller (41), the second roller (42), then turns to the first roller (41) to counterbalance forces added on the roller device (4), and extends downward to be fastened on the bottom bar (20).
3. The counterbalanced blind as claimed in claim 1, wherein the reel device (5) comprises a casing mounted in the top frame (10), and the first reel (51) and the second reel (52) are mounted rotatably in the casing (50).
4. The counterbalanced blind as claimed in claim 2, wherein the reel device (5) comprises a casing mounted in the top frame (10), and the first reel (51) and the second reel (52) are mounted rotatably in the casing (50).
5. The counterbalanced blind as claimed in claim 1, wherein each roller device (4) comprises a bracket (40) mounted in the top frame (10), and the first roller (41) and the second roller (42) are mounted rotatably on the bracket (40).
6. The counterbalanced blind as claimed in claim 2, wherein each roller device (4) comprises a bracket (40) mounted in the top frame (10), and the first roller (41) and the second roller (42) are mounted rotatably on the bracket (40).
7. The counterbalanced blind as claimed in claim 3, wherein each roller device (4) comprises a bracket (40) mounted in the top frame (10), and the first roller (41) and the second roller (42) are mounted rotatably on the bracket (40).
8. The counterbalanced blind as claimed in claim 4, wherein each roller device (4) comprises a bracket (40) mounted in the top frame (10), and the first roller (41) and the second roller (42) are mounted rotatably on the bracket (40).
Type: Application
Filed: Sep 17, 2009
Publication Date: Mar 17, 2011
Inventor: Wen-Jui Lin (Singang Hsiang)
Application Number: 12/561,357
International Classification: A47H 5/14 (20060101);