TWI848759B - No-string curtain retraction mechanism - Google Patents

Abstract

The present invention provides a retractable mechanism for a non-drawstring curtain, wherein the retractable mechanism is arranged inside the lower beam, and comprises two retractable belt boxes, a rotating shaft, and a driving and braking device. The two retractable belt boxes are arranged inside the lower beam relatively to each other and are respectively connected to each retractable belt, and can retract or release each retractable belt. The rotating shaft is rotatably extended and arranged inside the lower beam and is connected to the two retractable belt boxes, and can drive the two retractable belt boxes to synchronously retract or release the two retractable belts, so that the lower beam rises or falls. The driving and braking device comprises a first and a second retractable belt box. The second conical tube, a connecting rope and a spring motor, the rotating shaft passes through the axis of the first conical tube and can drive the first conical tube to rotate. The first and second conical tubes are staggered in the lower beam. One end of the connecting rope is connected to one end of the first conical tube, and the other end is rolled up and extended to one end of the second conical tube. The spring motor is connected to one end of the first and second conical tubes and can apply reverse elastic force to the first and second conical tubes to provide power for the retraction and extension of each blade and the lifting and lowering of the lower beam.

Description

The retracting and extending mechanism of the curtain without drawstring

The present invention is related to a cordless curtain, and more specifically, to a retractable and retractable mechanism for a cordless curtain.

According to the structure, the known curtains can be divided into two types: drawstring curtains and non-drawstring curtains. For the drawstring curtains, a drawstring on the outside of the curtain is mainly used to pull the curtain to open or close the curtain. In contrast, the non-drawstring curtain uses manpower to push up or press down the lower beam of the curtain to open or close the curtain.

Generally speaking, it is known that ropeless curtains are mostly wound up or released by a take-up device installed in the upper beam, so that the lower beam rises or falls relative to the upper beam. Usually, the movement of the lower beam is controlled by the user pushing up or pulling down the lower beam with both hands. However, even under normal operation, it is still possible that due to deviations in human operation or uneven winding of the rope in the take-up device, the lower beam will be slightly tilted and not in a completely horizontal state when it stops rising and falling. As the stop position of the lower beam is closer to the upper beam, this slight tilt of the lower beam appears visually unsightly. Secondly, when the curtain is fully folded, if the lower beam is slightly tilted, the user often needs to pull down the lower beam again to release the pull rope from the retractor, and then push the lower beam up again to adjust the horizontality of the lower beam. The operation is not convenient and is time-consuming and laborious.

To this end, it is known that many companies have developed related technologies that can maintain the horizontality of the lower beam. Most of them are to set friction elements or mechanisms in the take-up device of the upper beam to control the movement of the pull rope to maintain the horizontality of the lower beam and prevent the curtain from sliding down at the highest point or rebounding at the lowest point. There are many related patents, such as US Patents US9366077, US9482049 and US7228797, etc., which are not described here one by one.

Although the aforementioned patent and related known technologies for maintaining the horizontality of the lower beam can indeed solve the aforementioned problems, the wire-retracting devices for controlling the pull rope are all installed on the upper beam and have not changed much over the years. In addition, the effect of using friction to control the movement of the pull rope is not stable and there is still room for improvement.

The main purpose of the present invention is to provide a rope-free curtain retracting and extending mechanism provided by the present invention, which can provide curtain retracting and extending power, and can keep the left and right ends of the lower beam at the same height at all times, without causing the lower beam to be unbalanced or tilted. Moreover, when no force is applied to the lower beam, the lower beam can be positioned at the required position.

Therefore, in order to achieve the above-mentioned purpose, the present invention provides a retractable mechanism for a drawstring-free curtain, the drawstring-free curtain comprising an upper beam, a lower beam, a plurality of blades between the upper beam and the lower beam, and two retractable belts passing through each of the blades to connect the upper beam and the lower beam. The retractable mechanism is arranged inside the lower beam and comprises a plurality of retractable belt boxes, which are arranged relatively Each retractable belt is connected to the lower beam and can be retracted or released. A rotating shaft is rotatably extended in the lower beam and connected to two retractable belt boxes. When rotating, the two retractable belt boxes can be driven to synchronously retract or release the two retractable belts, so that the lower beam rises or falls. A plurality of driving and braking devices include a first and a second conical cylinder, a connecting rod, and a connecting rod. The first and second conical tubes are mounted in the lower beam and include a large diameter end and a small diameter end respectively. The first and second conical tubes are arranged in a staggered manner with the large and small diameter ends facing each other, and the surfaces of the first and second conical tubes are respectively spirally provided with a Rope groove, one end of the connecting rope is connected to the large diameter end of the first conical tube, and the other end is rolled up in the rope groove and then extended from the small diameter end to the large diameter end of the second conical tube. The spring motor is connected to one end of the first and second conical tubes, and can apply reverse elastic force to the first and second conical tubes to provide power for the retraction and extension of each blade and the lifting and lowering of the lower beam.

Preferably, the two retractable belts are sheet-shaped belt bodies, and the two retractable belt boxes each include a rotating wheel, and each retractable belt is connected to each rotating wheel.

Preferably, the two retractable tape boxes each include a box body, the two box bodies are fixed inside the lower beam, and each of the rotating wheels is placed in each box body and connected in series by a rotating shaft.

Preferably, the extension direction of the rotating shaft is parallel to each blade and the upper beam and the lower beam, and the axial direction of the first and second conical tubes is parallel to the blades and the upper beam and the lower beam.

Preferably, the driving brake device further includes a connecting shaft, which can rotatably pass through the axis of the second conical tube and be parallel to the rotating shaft.

Preferably, the spring motor includes a first and a second roller, the first and the second rollers are connected to one end of the first and the second conical cylinders respectively, and an elastic member, both ends of which are connected to the first and the second rollers, and can apply an elastic force to make the first and the second rollers rotate in opposite directions.

Preferably, the elastic member is a spiral spring with two ends winding in opposite directions.

Preferably, the rotating shaft is connected to the first conical cylinder, the first roller is sleeved on the rotating shaft but not connected to the rotating shaft, the elastic force of one end of the elastic member is transmitted to the first conical cylinder and the rotating shaft through the first roller, the second roller is connected to the connecting shaft, and the elastic force of the other end of the elastic member is transmitted to the connecting shaft and the second conical cylinder through the second roller.

Preferably, the driving brake device further includes a base, which is fixed on the top side of the lower beam, and the first and second conical tubes, spring motor, connecting shaft and rotating shaft are mounted on the base.

Preferably, the spring motor further includes a cover sheet, which is arranged on the base to cover the first and second rollers and the elastic member.

The present invention:

10: Retractable mechanism

12: Retract and place the tape box

14: Rotating axis

16: Driving brake device

22: Box body

24: Wheel

26: Base

28: Connecting shaft

30: First conical tube

32: Second cone tube

34: Connecting rope

36: Spring motor

38: Large diameter end

40: End of the small path

41: Rope Trough

42: First roller

44: Second roller

46: Elastic parts

48: Cover sheet

Usage:

1: Curtains without drawstrings

2: Upper beam

3: Lower beam

4: Leaves

5: Retractable belt

The first figure is a schematic diagram of the appearance and partial decomposition of a preferred embodiment of the present invention.

The second figure is a three-dimensional diagram of the bottom side and part of the retractable mechanism in a preferred embodiment of the present invention.

The third figure is a schematic diagram of the operation of a preferred embodiment of the present invention, showing the state of raising the lower beam.

The fourth figure shows the state of the retractable mechanism when the lower beam rises in a preferred embodiment of the present invention.

The fifth figure is a schematic diagram of the operation of a preferred embodiment of the present invention, showing the state of pulling down the lower beam.

Figure 6 shows the state of the retractable mechanism when the lower beam descends in a preferred embodiment of the present invention.

The following is a preferred embodiment of the present invention, and further detailed description is made with reference to the drawings. First, please refer to the first and second figures, which show a retractable mechanism 10 of a non-cord curtain of a preferred embodiment of the present invention. The non-cord curtain 1 includes a parallel upper beam 2 and a lower beam 3, and a plurality of blades 4 connected by two retractable belts 5 and disposed between the upper beam 2 and the lower beam 3. The retractable mechanism 10 is connected to the two retractable belts 5 to control the retractable mechanism 10. The belt 5 is retracted and released, so that the lower beam 3 can be pulled up or down, and multiple ladder belts and other components; the upper beam 2, lower beam 3, multiple blades 4, two retractable belts 5 and retractable mechanism 10 mentioned above are generally the components of the known non-roped blinds. The structure and operation method of each component will not be described here. The feature of the present invention is that the retractable mechanism 10 is arranged inside the lower beam 3, including two retractable belt boxes 12, a rotating shaft 14 and a driving brake device 16.

The two retractable tape boxes 12 are relatively arranged inside the lower beam 3. The two ends are connected to the retractable tapes 5 respectively. The two retractable tapes 5 are metal sheet-shaped belt bodies, but not limited to them. The two retractable tape boxes 12 respectively include a box body 22 and a rotating wheel 24. Each box body 22 is fixed to the top side of the lower beam 3. Each rotating wheel 24 is pivoted in each box body 22. Each retractable tape 5 is connected to each rotating wheel 24, so that each retractable tape 5 can be rolled up or released when each rotating wheel 24 rotates.

The rotating shaft 14 is connected in series to the rotating wheels 24 of the two retractable belt boxes 12. When rotating, it can drive each rotating wheel 24 to synchronously retract or release the two retractable belts 5 to make the lower beam 3 rise or fall.

The driving brake device 16 is composed of a base 26, a connecting shaft 28, a first tapered tube 30, a second tapered tube 32, a connecting rope 34 and a spring motor 36. The base 26 is fixed to the top side of the lower beam 3. The connecting shaft 28 is rotatably mounted on the base 26 and parallel to the rotating shaft 14. The first conical tube 30 is pivoted on the base 26 with the rotating shaft 14 passing through its axis, and the second conical tube 32 is pivoted on the base 26 and parallel to the first conical tube 30 with the connecting shaft 28 passing through its axis. Moreover, the first and second conical tubes 30 and 32 respectively have a large diameter end 38 and a small diameter end 40. The first and second conical tubes 30 and 32 are staggeredly arranged on the rotating shaft 14 and the connecting shaft 28 in a manner that the large and small diameter ends 38 and 40 are opposite to each other. In addition, a rope groove 41 is spirally provided on the surface of the first and second conical tubes 30 and 32 respectively, and the first conical tube 30 can be driven to rotate when the rotating shaft 14 rotates. One end of the connecting rope 34 is connected to the large diameter end 38 of the first conical tube 30 , and the other end is rolled up in the rope groove 41 and then extends from the small diameter end 40 to connect to the large diameter end 38 of the second conical tube 32 . The spring motor 36 has a first roller 42 and a second roller 44, an elastic member 46 and a cover 48. The first and second rollers 42 and 44 are respectively mounted on the rotating shaft 14 and the connecting shaft 28 and connected to one end of the first and second conical tubes 30 and 32 (one end of the first roller 42 is connected to the small diameter end 40 of the first conical tube 30, and one end of the second roller 44 is connected to the large diameter end 38 of the second conical tube 32, and the first roller 42 is not connected to the rotating shaft 14, and the second roller 44 is connected to the connecting shaft 28). The elastic member 46 is a conventional member with two ends winding in opposite directions. The two ends of the vortex spring sheet are connected to the first and second rollers 42 and 44 respectively, so as to exert elastic force to make the first and second rollers 42 and 44 rotate in opposite directions. Thus, the elastic force at one end of the elastic member 46 can be transmitted to the first conical cylinder 30 and the rotating shaft 14 through the first roller 42, and the elastic force at the other end of the elastic member 46 can be transmitted to the connecting shaft 28 and the second conical cylinder 32 through the second roller 44, so as to provide the power for the retraction and extension of each blade 4 and the lifting and lowering of the lower beam. The cover sheet 48 is provided on the base 26 to cover the first and second rollers 42 and 44 and the elastic member 46.

Thus, the retractable and unretractable mechanism 10 of the rope-free curtain of the present invention provides the retractable and unretractable power of the curtain by the elastic member 46, and each retractable and unretractable belt box 12 provides the storage and release of the retractable and unretractable belt 5, and the rotating shaft 14 is connected in series with the axis of the rotating wheel 24 of each retractable and unretractable belt box 12 and the first conical tube 30, so that the axis of each rotating wheel 24, the first conical tube 30 and the rotating shaft 14 can rotate synchronously, thereby keeping the left and right ends of the lower beam 3 at the same height at any time, and the lower beam 3 will not tilt due to being pulled down or pushed up.

Secondly, as shown in the third and fourth figures, when the drawstring-free window curtain 1 needs to be folded, the connecting rope 34 in the driving brake device 16 is completely wound around the rope groove 41 of the first conical tube 30, and the other end is connected to the large diameter end 38 of the second conical tube 32. When the lower beam 3 is pushed upward by hand, the blades 4 are also retracted. At this time, the second roller 44 can rotate under the spring force of the elastic member 46, synchronously driving the connecting shaft 28 and the second conical tube 32 to rotate. The second conical tube 32 can gradually untie the connecting rope 34 from the first conical tube 30, and then wrap it around the rope groove 41 of the second conical tube 32, and drive the first conical tube 30 to rotate, and then synchronously drive the rotating wheel 24 and the rotating shaft 14 of each retractable belt box 12 to rotate. Finally, the rotating wheel 24 of each retractable belt box 12 rolls up the retractable belt 5, and the rope-free window curtain 1 can be retracted.

Furthermore, as shown in FIG. 5 and FIG. 6 , when the ropeless window curtain 1 needs to be unfolded, the connecting rope 34 in the driving brake device 16 is completely wound around the rope groove 41 of the second conical tube 32 , and the other end is connected to the large diameter end 38 of the first conical tube 30 . When the lower beam 3 is pulled down by hand, each retractable belt 5 is gradually pulled out from each retractable belt box 12, and each blade 4 is gradually unfolded, and at the same time, the rotating wheel 24 of each retractable belt box 12 is driven to rotate, thereby driving the rotating shaft 14 and the first conical cylinder 30 to rotate synchronously, driving the connecting rope 34 to rotate the second conical cylinder 32, and gradually unwinding the connecting rope 34 from the second conical cylinder 32 and winding it around the rope groove 41 of the first conical cylinder 30. The rotation of the second conical cylinder 32 synchronously drives the connecting shaft 28 and the second roller 44 to rotate, so as to overcome the spring force of the elastic member 46, and the elastic member 46 is wound on the second roller 44, so that the ropeless window curtain 1 can be pulled down.

In addition, when the user releases the lower beam 3 or no external force acts on the lower beam 3, the lower beam 3 has a tendency to slide down or rise. The elastic member 46 of the driving brake device 16 can maintain a force balance under the action of the spring force to ensure that the lower beam 3 cannot rise or fall: when the lower beam 3 has a tendency to slide down, the first conical tube 30 can drive the second conical tube 32 to rotate. At this time, the weight of each blade 4 plus the total weight of the lower beam 3 and the retracting mechanism 10 is added. The torque on the second conical tube 32 through the connecting rope 34 is less than the torque on the second conical tube 32 through the elastic member 46 through the connecting shaft 28, which can prevent the lower beam 3 from sliding down. On the contrary, when the lower beam 3 has an upward trend, the second conical tube 32 drives the first conical tube 30 to rotate. At this time, the weight of each blade 4 plus the total weight of the lower beam 3 and the retractable mechanism 10 is superimposed, and the torque on the first conical tube 30 through the rotating shaft 14 is greater than the torque on the second conical tube 32 through the connecting rope 34 of the elastic member 46, which can prevent the lower beam 3 from rising.

Based on this, the conical design of the first and second conical tubes 30, 32 and the staggered arrangement of the large and small diameter ends 38, 40 have their own torque (the radius of the connecting rope 34 at different positions of the first and second conical tubes 30, 32 changes, so that the torque changes accordingly) considerations and effects, and as long as the hand leaves the lower beam 3 or there is no external force acting on the lower beam 3, the lower beam 3 can stay at the required position.

In addition, in order to prevent the rotational force load of the elastic member 46 from being too high, a one-way damping mechanism (not shown in the figure) can be added to the spring motor 36 to connect the second roller 44 of the spring motor 38. The one-way damping mechanism can be, for example, a spring and a clutch mechanism, but not limited to, to promote the second conical tube 32 to generate a rotational trend toward the first conical tube 30 when there is no external force and the self-weight of the no-string curtain 1 causes the no-string curtain 1 to unfold, but cannot overcome the rotational force and the one-way damping force of the elastic member 46, thereby making the no-string curtain 1 in a balanced static state. When the hand pulls the lower beam 3, the rotational force and one-way damping force of the elastic member 46 are overcome, and the drawstring-free curtain 1 can be smoothly unfolded. After letting go, the drawstring-free curtain 1 is immediately stopped by the rotational force and one-way damping force of the elastic member 46, thereby better solving the problem of the difference between the load-bearing force of the lower beam 3 when the drawstring-free curtain 1 is fully retracted and when it is fully unfolded, so that the lower beam will not slide down due to the weight of the curtain.

In summary, the retractable mechanism of the non-pull cord curtain provided by the present invention can utilize the elastic member in the driving and braking device to provide the retractable power of the curtain through the cooperation of the retractable belt boxes, the rotating shaft and the driving and braking device of the retractable mechanism in the lower beam, and each retractable belt box provides the storage and release of the retractable belt, and the rotating shaft is connected in series with the rotating wheel shaft of each retractable belt box. The structure of the center and the first conical tube can make the axis of each wheel, the first conical tube and the shaft rotate synchronously, not only can the left and right ends of the lower beam be kept at the same height at any time, but also when the lower beam is not pulled or force is not applied, the lower beam can be positioned at the required position, which is very practical; therefore, this invention does meet the requirements of invention patents, and an application is filed in accordance with the law.

The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Anyone with common knowledge in the relevant technical field may make some modifications, changes and embellishments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

10: Retractable mechanism

12: Retract and place the tape box

14: Rotating axis

16: Driving brake device

1: Curtains without drawstrings

2: Upper beam

3: Lower beam

4: Leaves

5: Retractable belt

Claims (10)

A retractable mechanism for a rope-free curtain, the rope-free curtain comprises an upper beam, a lower beam, a plurality of blades between the upper beam and the lower beam, and two retractable belts passing through each of the blades to connect the upper beam and the lower beam. The retractable mechanism is arranged inside the lower beam and comprises: Several retractable belt boxes are relatively arranged inside the lower beam and are respectively connected to each retractable belt, so as to be able to retract or release each retractable belt; A rotating shaft is rotatably extended and disposed in the lower beam and connected to two retractable belt boxes. When rotating, it can drive the two retractable belt boxes to synchronously retract or release the two retractable belts, so that the lower beam rises or falls; and A plurality of driving and braking devices include a first and a second conical tube, a connecting rope and a spring motor. The rotating shaft passes through the axis of the first conical tube to drive the first conical tube to rotate. The first and second conical tubes are mounted in the lower beam and include a large diameter end and a small diameter end respectively. The first and second conical tubes are arranged in a staggered manner with the large and small diameter ends facing each other. The surface of the cone-shaped cylinder is spirally provided with a rope groove. One end of the connecting rope is connected to the large diameter end of the first cone-shaped cylinder, and the other end is rolled up in the rope groove and then extended from the small diameter end to the large diameter end of the second cone-shaped cylinder. The spring motor is connected to one end of the first and second cone-shaped cylinders, and can apply a reverse elastic force to the first and second cone-shaped cylinders to provide power for the retraction and extension of each blade and the lifting and lowering of the lower beam. As described in claim 1, the retractable mechanism of the non-pull cord window curtain, wherein the two retractable belts are sheet-shaped belt bodies, the two retractable belt boxes each include a rotating wheel, and each retractable belt is connected to each rotating wheel. As described in claim 2, the retractable mechanism of the window curtain without a drawstring, wherein the two retractable belt boxes each include a box body, the two box bodies are fixed inside the lower beam, and the rotating wheels are respectively placed in each box body and connected in series by a rotating shaft. As described in claim 1, the retractable mechanism of the non-pull rope curtain, wherein the extension direction of the rotating shaft is parallel to each blade and the upper beam and the lower beam, and the axial direction of the first and second conical tubes is parallel to the blades and the upper beam and the lower beam relative to each other. As described in claim 4, the retractable and retractable mechanism of the non-pull rope curtain, wherein the driving and braking device further includes a connecting shaft that can rotatably pass through the axis of the second conical tube and be parallel to the rotating shaft. As described in claim 5, the retractable and retractable mechanism of the rope-free window curtain, wherein the spring motor comprises a first roller and a second roller, the first roller and the second roller are respectively connected to one end of the first and second conical cylinders, and an elastic member, both ends of which are connected to the first and second rollers, and can exert an elastic force to make the first and second rollers rotate in opposite directions. As described in claim 6, the retractable and retractable mechanism of the non-pull rope curtain, wherein the elastic member is a spiral spring sheet with opposite winding directions at both ends. As described in claim 7, the retractable mechanism of the non-pull rope curtain, wherein the rotating shaft is connected to the first conical cylinder, the first roller is sleeved on the rotating shaft but not connected to the rotating shaft, the elastic force of one end of the elastic member is transmitted to the first conical cylinder and the rotating shaft through the first roller, the second roller is connected to the connecting shaft, and the elastic force of the other end of the elastic member is transmitted to the connecting shaft and the second conical cylinder through the second roller. As described in claim 8, the retractable and retractable mechanism of the non-pull rope curtain, wherein the driving and braking device further includes a base, which is fixed on the top side of the inner part of the lower beam, and the first and second conical tubes, the spring motor, the connecting shaft and the rotating shaft are mounted on the base. As described in claim 9, the retractable and retractable mechanism of the non-pull rope curtain, wherein the spring motor further includes a cover plate, which is covered on the base to cover the first and second rollers and the elastic member.

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