Winding mechanism of blind
A winding mechanism mounts at head rail of blind and includes lines each wrapped around a bottom stiffener strip and the head rail, a cord wound around cord reel and having at least one loop wrapped around a bight section of the line, a first drum coupled to the cord reel by gear, a second drum, and an S-shaped tape spring interconnected the first and second drums, the spring adapted to exert a force to support the drapery material. In a downward pulling of the stiffener strip the cord reel rotates to release each line and the cord with one worm section of the spring being further wound and the other worm section thereof being loosened for reaching a balance with the blind. An upward pulling of the same has an opposite effect. The drapery material is able to stay at any position in response to stopping the cord reel.
This is a continuation-in-part of application Ser. No. 11/023,560, which is now pending.
BACKGROUND OF THE INVENTION1. Field of Invention
The present invention relates to blinds and more particularly to a winding mechanism of a blind (e.g., roll-up or Venetian blind) which can be releasably locked in any one of a plurality of positions relative to a top of window frame.
2. Related Art
Typically, a blind (e.g., roll-up or Venetian blind) is adapted to raise or lower by pulling a lift cord coupled to a winding mechanism. However, it is possible that a child may tie the exposed cord about the neck to cause danger or even death. Thus, this is not safe.
A conventional roll-up blind having a hidden lift cord is shown in
However, the previous design suffered from several disadvantages. For example, the springs 2 tend to lose its elasticity after a predetermined times of lowering or raising operation of the folds 4. And in turn, it may compromise the positioning capability of folds 4 by operating the cords 7 and 8. Further, there are no guide members for the cords 7 and 8 in the head rail 1 and the stiffener strip 3. It may increase friction in pulling the cords 7 and 8 during operation. To the worse, the cords 7 and 8 may break after a predetermined times of lowering or raising operation. Furthermore, the stiffener strip 3 is relatively thin, resulting in a poor maneuverability of the blind.
Thus, it is desirable to provide an improved winding mechanism of blind in order to overcome the above drawbacks of prior art.
SUMMARY OF THE INVENTIONIt is therefore an object of the present invention to provide a winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising a cord reel provided on the head rail; a line having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel; a cord wound around the cord reel and coupled to the bight section of the line; a first drum rotated with the cord reel; a second drum; a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material wherein in a downward pulling of the stiffener strip the cord reel rotates to release the line and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel; and a retaining member including an elongate seat engaged with a bottom surface of the stiffener strip, and two upwardly curved snapping edges along front end rear edges of the seat for clamping the stiffener strip; wherein in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the line and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.
It is another object of the present invention to provide a winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising a cord reel provided on the head rail; lines each having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel; a cord wound around the cord reel and having at least one loop wrapped around the bight section; a first drum rotated with the cord reel; a second drum; and a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material; wherein in a downward pulling of the stiffener strip the cord reel rotates to release the lines and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel; and in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the lines and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to
Referring to FIGS. 5 to 7, the winding mechanism 40 comprises a case 41 open to its bottom, the case 41 having an internal space 42 for mounting a cord reel 43, a first drum 44, and a second drum 45 therein. The winding mechanism 40 further comprises at least three shafts 46 each having two ends fixed on two opposite walls of the case 41 with the cord reel 43, the first drum 44, or the second drum 45 rotatably put thereon. A tape spring 47 is interconnected the first drum 44 and the second drum 45. The tape spring 47 comprises two worm sections 471 and 472 together formed an S. The tape spring 47 can exert a force to support the weight of the sheet of drapery material 30. A free end 48 of the worm section 472 is fixed on the first drum 44. A long cord 13A is wound around the cord reel 43. A winding of the cord 13A is opposite to that of each of the worm sections 471 and 472. One end of the cord 13A passes one of two slits 411 on one side surface of the case 41 to couple to the line 49 at a bight section 491 formed at the other end of the line 49. As such, the line 49 and the cord 13A can operate as a whole. The cord reel 43 comprises a gear 412 at one end to be meshed with a gear 413 of the first drum 44 such that the cord reel 43 and the first drum 44 can rotate in opposite directions.
The S-shaped tape spring 47 is energized due to the same winding direction of the worm sections 471 and 472 and the weight of the sheet of drapery material 30. A downward pulling of the stiffener strip 20 by the hand together with the weight of the sheet of drapery material 30 can overcome an upward pulling force of the cord 13A provided by the tape spring 47. As such, the cord reel 43 rotates to release the cord 13A and thus the line 49 so as to lower the sheet of drapery material 30. The worm section 471 is wound further (i.e., store energy) and the worm section 472 is loosened to compensate the further winding of the worm section 471 during the release. Such serves as a counterweight of the sheet of drapery material 30 so as to reach a balance. As a result, the sheet of drapery material 30 is adapted to stay at any one of a plurality of positions from the fully raised position to the fully lowered position by stopping the cord reel 43.
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In practice, each of the springs 47 and 66 can control one or more cord reels 43 and 67 for accommodating different sizes of the blind. In brief, the invention is safe and smooth in its operation.
While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.
Claims
1. A winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising:
- a cord reel provided on the head rail;
- a line having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel;
- a cord wound around the cord reel and coupled to the bight section of the line;
- a first drum rotated with the cord reel;
- a second drum;
- a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material wherein in a downward pulling of the stiffener strip the cord reel rotates to release the line and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel; and
- a retaining member including an elongate seat engaged with a bottom surface of the stiffener strip, and two upwardly curved snapping edges along front end rear edges of the seat for clamping the stiffener strip;
- wherein in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the line and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.
2. The winding mechanism of claim 1, wherein the cord reel comprises a first gear and the first drum comprises a second gear meshed with the first gear such that the cord reel and the first drum are adapted to rotate in opposite directions.
3. The winding mechanism of claim 1, wherein the spring is adapted to control the cord reel.
4. The winding mechanism of claim 1, further comprising a gear interconnected the first drum and the cord reel.
5. The winding mechanism of claim 1, further comprising a plurality of spaced guide rollers disposed in the groove and two holes formed on a bottom of the groove, and wherein the guide rollers are coupled together by winding the cord therearound, and two ends of the cord are adapted to pass the holes.
6. The winding mechanism of claim 1, wherein the line is wound in a direction opposite to that of each of the worm sections.
7. The winding mechanism of claim 1, further comprising a case for receiving the cord reel, the first drum, and the second drum therein.
8. A winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising:
- a cord reel provided on the head rail;
- lines each having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel;
- a cord wound around the cord reel and having at least one loop wrapped around the bight section;
- a first drum rotated with the cord reel;
- a second drum; and
- a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material;
- wherein in a downward pulling of the stiffener strip the cord reel rotates to release the lines and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel; and in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the lines and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.
9. The winding mechanism of claim 8, further comprising a retaining member including an elongate seat engaged with a bottom surface of the stiffener strip, and two upwardly curved snapping edges along front end rear edges of the seat for clamping the stiffener strip.
10. The winding mechanism of claim 8, wherein the cord reel comprises a first gear and the first drum comprises a second gear meshed with the first gear such that the cord reel and the first drum are adapted to rotate in opposite directions.
11. The winding mechanism of claim 8, wherein the spring is adapted to control the cord reel.
12. The winding mechanism of claim 8, further comprising a gear interconnected the first drum and the cord reel.
13. The winding mechanism of claim 8, further comprising a plurality of spaced guide rollers disposed in the groove and holes formed on a bottom of the groove, and wherein the guide rollers are coupled together by winding the cord therearound, and two ends of the cord are adapted to pass the holes.
14. The winding mechanism of claim 8, wherein each line is wound in a direction opposite to that of each of the worm sections.
15. The winding mechanism of claim 8, further comprising a case for receiving the cord reel, the first drum, and the second drum therein.
Type: Application
Filed: Jan 4, 2006
Publication Date: Jun 29, 2006
Inventor: Henry Lin (Taipei)
Application Number: 11/324,404
International Classification: A47H 5/00 (20060101);