TWM676032U - Two-way opening curtains - Google Patents

Abstract

A double-opening curtain includes an upper beam, a middle beam, a lower beam, a first pivot, a second pivot, a first lifting belt and a second lifting belt in the form of thin strips, a first power device, and a second power device. The first lifting belt connects to the middle beam and the first pivot, the second lifting belt connects to the lower beam and the second pivot, the first power device is connected to the first pivot and provides driving force to the first pivot so that the first pivot rotates in a direction inclined to retract the first lifting belt, and the second power device is connected to the second pivot and provides driving force to the second pivot so that the second pivot rotates in a direction inclined to retract the second lifting belt. Therefore, this design eliminates the need for exposed control ropes to move the center or bottom beams, effectively preventing children from accidentally becoming entangled in the control ropes.

Description

Two-way opening blinds

This work concerns a type of curtain, specifically a two-way opening curtain that can change the area and region of light blocked.

Curtains come in various types and styles, one of which is called a top-down, bottom-up (TDBU) curtain. Its structure includes an upper beam, a middle beam, and a lower beam. The upper beam is fixed to the window frame or wall, and a light-blocking structure is installed between the middle and lower beams. The two ends of this light-blocking structure are connected to the middle and lower beams, respectively. By linking the middle and lower beams to different lifting systems, the user can individually operate the middle and lower beams to move them up and down and adjust their position, thereby changing the open or closed state and position of the light-blocking structure. This allows for flexible control of the area and region of light blocked by the TDBU curtain.

A common type of two-way opening blind uses a center beam and a bottom beam linked by thin ropes to corresponding lifting systems, each driven by a separate exposed control loop. By pulling these loops, the movement of either the center or bottom beam can be controlled. However, when children are near the blinds or directly play with the ropes or control loops, there is a risk of the ropes or loops becoming coiled and suffocating around their necks, indicating room for improvement.

In view of the above problems, this invention provides a two-way opening curtain that eliminates the need for exposed control cords to move the center or bottom beam, and also avoids the presence of thin, coiled cords, thus effectively preventing the risk of children accidentally becoming entangled in the control cords.

This invention proposes a two-way opening curtain, comprising: an upper beam; a middle beam movably positioned below the upper beam; a lower beam movably positioned below the middle beam; a shielding structure disposed between the middle beam and the lower beam; a first pivot rotatably disposed within the upper beam; a second pivot rotatably disposed within the upper beam; at least one first lifting belt, the first lifting belt being a thin strip, one end of the first lifting belt being connected to the middle beam and the other end being connected to the first pivot; and at least one second lifting belt, the second lifting belt being a thin strip, one end of the second lifting belt being connected to the lower beam and the other end being connected to the second pivot. A shaft; a first power device disposed within the upper beam, the first power device being connected to the first rotating shaft and providing driving force to the first rotating shaft, causing the first rotating shaft to rotate in a direction inclined to wind the first lifting belt; the first power device comprising: a first drive wheel; a first spring, one end of which is connected to the first drive wheel, and the first spring being wound or released by the first drive wheel depending on the rotation direction of the first drive wheel; wherein, when the middle beam is moved away from the upper beam, the first lifting belt moves with the middle beam and is released from the first rotating shaft, driving the first rotating shaft to rotate, thereby driving the first drive wheel to rotate. The first spring is wound around the first drive wheel and accumulates elastic force. When the middle beam is moved towards the upper beam, the first spring releases its elastic force due to the movement of the middle beam and is released from the first drive wheel, causing the first drive wheel to rotate in the opposite direction, thereby driving the first rotating shaft to rotate to wind up the first lifting belt. A second power device is disposed in the upper beam. The second power device is connected to the second rotating shaft and provides driving force to the second rotating shaft, causing the second rotating shaft to rotate in a direction inclined to wind up the second lifting belt. The second power device includes: a second drive wheel; and a second spring, one end of which is connected to the second drive wheel. The second spring is wound or released from the second drive wheel depending on the direction of rotation of the second drive wheel. Specifically, when the lower beam is moved away from the upper beam, the second lifting belt is released from the second rotating shaft as the lower beam moves, causing the second rotating shaft to rotate, which in turn drives the second drive wheel to rotate. This causes the second spring to wind around the second drive wheel and accumulate elastic force. When the lower beam is moved closer to the upper beam, the second spring releases its elastic force due to the movement of the lower beam and is released from the second drive wheel, causing the second drive wheel to rotate in the opposite direction, which in turn drives the second rotating shaft to rotate and retract the second lifting belt.

In some embodiments, the first power device includes a first power converter and a first transmission group. The first power converter is connected to the first drive wheel, and the first transmission group is connected between the first power converter and the first rotating shaft. Through the transmission of the first power converter and the first transmission group, rotation of either the first drive wheel or the first rotating shaft drives the other to rotate synchronously. The second power device includes a second power converter and a second transmission group. The second power converter is connected to the second drive wheel, and the second transmission group is connected between the second power converter and the second rotating shaft. Through the transmission of the second power converter and the second transmission group, rotation of either the second drive wheel or the second rotating shaft drives the other to rotate synchronously.

In some embodiments, the first power transmission assembly includes a first tapered wheel, a second tapered wheel, and a first transmission rope. The first and second tapered wheels are arranged in opposite directions, and the two ends of the first transmission rope are respectively connected to and can be wound around the first and second tapered wheels, thereby linking the first and second tapered wheels. The second power transmission assembly includes a third tapered wheel, a fourth tapered wheel, and a second transmission rope. The third and fourth tapered wheels are arranged in opposite directions, and the two ends of the second transmission rope are respectively connected to and can be wound around the third and fourth tapered wheels, thereby linking the third and fourth tapered wheels.

In some embodiments, the first transmission assembly includes a first bushing and a first driven member, the first rotating shaft passing through and connected to the first bushing, and the first driven member located between and connected to both the first power transmission assembly and the first bushing; the second transmission assembly includes a second bushing and a second driven member, the second rotating shaft passing through and connected to the second bushing, and the second driven member located between and connected to both the second power transmission assembly and the second bushing.

In some embodiments, the first driven member has a first tooth and a second tooth connected to one end of the first tooth; the first bushing has a first tube and a third tooth, the third tooth being disposed at one end of the first tube and engaging with the second tooth; the second driven member has a fourth tooth and a fifth tooth connected to one end of the fourth tooth; the second bushing has a second tube and a sixth tooth, the sixth tooth being disposed at one end of the second tube and engaging with the fifth tooth.

In some embodiments, the second tooth of the first driven member and the third tooth of the first bushing are mutually corresponding umbrella gear structures; the fifth tooth of the second driven member and the sixth tooth of the second bushing are mutually corresponding umbrella gear structures.

In some embodiments, the first power device further includes a first housing with a first limiting hole, through which the first tube portion of the first bushing passes, and the outer periphery of the first tube portion abuts against the wall of the first limiting hole; the second power device further includes a second housing with a second limiting hole, through which the second tube portion of the second bushing passes, and the outer periphery of the second tube portion abuts against the wall of the second limiting hole.

In some embodiments, the first housing includes a mating first base and a first cover, with a first limiting hole formed between the first base and the first cover; the second housing includes a mating second base and a second cover, with a second limiting hole formed between the second base and the second cover.

In some embodiments, the first bushing has a first shaft hole penetrating the first tube and the third tooth, the shape of which matches the shape of the first rotating shaft, allowing the first rotating shaft to pass through it, so that the first rotating shaft and the first bushing rotate synchronously; the second bushing has a second shaft hole penetrating the second tube and the sixth tooth, the shape of which matches the shape of the second rotating shaft, allowing the second rotating shaft to pass through it, so that the second rotating shaft and the second bushing rotate synchronously.

In some embodiments, the system further includes a first winding pulley and a second winding pulley. A first rotating shaft passes through and is linked to the first winding pulley. The upper end of the first lifting belt is connected to the first winding pulley and can be wound or released from it. A second rotating shaft passes through and is linked to the second winding pulley. The upper end of the second lifting belt is connected to the second winding pulley and can be wound or released from it.

In some embodiments, the first pulley has a first annular groove from which the first lifting belt is wound or released, and each turn of the first lifting belt is substantially aligned and overlaps another turn; the second pulley has a second annular groove from which the second lifting belt is wound or released, and each turn of the second lifting belt is substantially aligned and overlaps another turn.

In some embodiments, a first magnetic attractor is provided on the side of the upper beam facing the middle beam, and a second magnetic attractor is provided on the middle beam in the area corresponding to the first magnetic attractor, so that the upper beam and the middle beam attract each other.

In some embodiments, the first power device further includes a first base and a first cover, the first base being disposed within the upper beam, the first cover covering the first base, and the first drive wheel and the first spring sandwiched between the first cover and the first base; the second power device further includes a second base and a second cover, the second base being disposed within the upper beam, the second cover covering the second base, and the second drive wheel and the second spring sandwiched between the second cover and the second base.

This innovative double-opening curtain replaces the traditional exposed control cord with the aforementioned features, and uses a thin strip that is less prone to coiling instead of a traditional rope. Therefore, it effectively prevents children from getting their control cords tangled around their necks while playing, thus effectively preventing such accidents.

1: Two-way opening blinds

10: Raising the roof beam

102: First magnetic component

12: Zhongliang

122: Second magnetic chuck

14: Lower beam

16: Shielding Structure

20: First winding device

22: First Rotating Shaft

24: First winding pulley

242: First Circular Channel

26: Second winding device

28: Second Rotating Shaft

30: Second winding pulley

302: Second Annular Channel

32: First lifting belt

34: Second lifting belt

40: First power unit

42: First Shell

422: First Plinth

424: First Cover

426: First limiting hole

44: First storage spring

46: First drive wheel

462: Gears

48: The First Spring

50: First Transmission Group

52: First tapered wheel

522: Great Path End

524: Side Path End

526: Gears

54: Second tapered wheel

542: Great Path End

544: Side Path End

546: Gears

56: First transmission rope

60: First transmission group

62: First follower

622: First tooth

624: Second tooth

64: First sleeve

642: First Management Section

644: Third Tooth

646: First shaft hole

70: Second power unit

72: Second Shell

722: Second Plinth

724: Second Cover

726: Second limiting hole

74: Second storage spring

76: Second drive wheel

762: Gears

78: The Second Spring

80: Second Transmission Unit

82: Third Conical Wheel

822: Great Path End

824: Side Path End

826: Gears

84: Fourth Conical Wheel

842: Great Path End

844: Side Path End

846: Gears

86: Second transmission rope

90: Second transmission group

92: Second follower

922: Fourth Tooth

924: Fifth Tooth

94: Second sleeve

942: Second Management Section

944: Sixth Tooth

946: Second shaft hole

This work can be understood by referring to the following diagrams and detailed explanations. Following industry standard practice, the components are not drawn to scale. For clarity of discussion, the dimensions of each component may be arbitrarily enlarged or reduced.

Figure 1 is a front view of an embodiment of the bidirectional opening curtain of this invention.

Figure 2 is a perspective view of an embodiment of the bidirectional opening/closing curtain of this invention.

Figure 3 is a top view of an embodiment of the upper beam in Figure 1.

Figure 4 is a partial exploded perspective view of an embodiment of the first winding device, the first lifting belt, and the first power device of Figure 2.

Figure 5 is a partial front view of an embodiment of the first winding device, the first lifting belt, and the first power device.

Figure 5A is a partial cross-sectional view of an embodiment of the first power unit, mainly showing the configuration of the first transmission assembly and the first housing.

Figure 6 is a partial exploded perspective view of an embodiment of the second winding device, the second lifting belt, and the second power device of Figure 2.

Figure 7 is a partial front view of one embodiment of the second winding device, the second lifting belt, and the second power device.

Figure 7A is a partial cross-sectional view of an embodiment of the second power unit, mainly showing the configuration of the second transmission assembly and the second housing.

Figure 8 is a front view of an embodiment of the bidirectional opening curtain of this invention, in which the middle beam and lower beam are moved to the furthest position from the upper beam.

Figure 8A is a magnified view of a portion of Figure 8, mainly showing the status of the first variable transmission unit.

Figure 9 is a front view of an embodiment of the double-opening blind of this invention, in which the center beam is moved to the position closest to the top beam, and the bottom beam is moved to the position furthest from the top beam.

Figure 9A is a magnified view of a portion of Figure 9, mainly showing the status of the second variable force unit.

Figure 9B is a magnified view of a portion of Figure 9, mainly showing the status of the first variable transmission unit.

Figure 10 is a front view of an embodiment of the double-opening blind of this invention, in which the middle beam and lower beam are moved to positions closest to the upper beam.

Figure 10A is a magnified view of a portion of Figure 10, mainly showing the status of the second variable transmission unit.

The various features, styles, or similarities of the curtains are described more fully below with the aid of figures, which show and depict one or more styles of the curtains and their operating system of this creation. It is understood that the various features, styles, or similarities described below can be used independently or in combination with each other. Furthermore, the curtains disclosed herein can be embodied in many different forms and should not be construed as limited to the embodiments with all the features presented herein. In the figures, unless otherwise indicated, the same element symbols always refer to the same element.

Furthermore, it must be stated that the technical features provided in this work are not limited to the specific structures, uses, and applications described in the embodiments. The terminology used in this specification is illustrative and descriptive, and is understood by one of ordinary skill in the art. The directional terms such as "front," "back," "up," "down," "left," "right," "top," "bottom," "inner," and "outer" mentioned in this specification are merely illustrative descriptions based on normal usage directions and are not intended to limit the scope of the claims.

Furthermore, the singular forms of quantifiers such as "a," "an," and "the" used in the scope of this patent application all include plural meanings. Therefore, for example, the description of "an element" refers to one or more elements, and includes equivalent substitutions known to the ordinary person in the art. All conjunctions used in similar circumstances should also be understood in the broadest sense; specific shapes, structural features, or technical terms described in the description should also be understood to include equivalent structures or technical terms that can achieve the functions accomplished by the specific structure or technical term.

Please refer to Figures 1 and 2, which show a front view and a perspective view of an embodiment of the double-opening blind 1 of this invention. The double-opening blind 1 includes an upper beam 10, a middle beam 12, and a lower beam 14, and a light-blocking structure 16 is provided between the middle beam 12 and the lower beam 14. The light-blocking structure 16 includes, but is not limited to, blinds such as Venetian blinds, honeycomb blinds, Roman blinds, or roller blinds. This embodiment uses a honeycomb blind as an example. In addition, please also refer to Figure 3, the double-opening blind 1 also includes a first winding device 20, a second winding device 26, two first lifting belts 32, two second lifting belts 34, a first power device 40, and a second power device 70. Furthermore, in some embodiments, an additional concealing structure may be provided between the middle beam and the top beam, without limitation.

Please refer to Figures 2, 3 and 4. The first winding device 20 includes a first rotating shaft 22 and two first winding pulleys 24. The first rotating shaft 22 passes through the two first winding pulleys 24 in a manner that prevents them from spinning freely relative to each other, so that the first rotating shaft 22 and the two first winding pulleys 24 can rotate synchronously and in the same direction. One end of each of the two first lifting belts 32 is connected to one of the first winding pulleys 24, and the other end of each first lifting belt 32 passes through the upper beam 10 and extends downward to be fixed to the middle beam 12. Please refer to Figures 2, 3, and 6. The second winding device 26 includes a second rotating shaft 28 and two second winding pulleys 30. The second rotating shaft 28 passes through the two second winding pulleys 30 in a manner that prevents them from idling relative to each other, so that the second rotating shaft 28 and the two second winding pulleys 30 can rotate synchronously and in the same direction. One end of each of the two second lifting belts 34 is connected to the second winding pulleys 30, and the other end of each second lifting belt 34 passes through the upper beam 10, then extends downward and sequentially passes through the middle beam 12 and the shielding structure 16 before being fixed to the lower beam 14. Please refer to Figures 4 and 6 together. In this embodiment, the first rotating shaft 22 and the second rotating shaft 28 are both polygonal rods. Each first winding pulley 24 has a polygonal hole for the first rotating shaft 22 to pass through, and each second winding pulley 30 has a polygonal hole for the second rotating shaft 28 to pass through. This ensures that they do not rotate relative to each other.

Please refer to Figures 4 and 6. Both the first lifting belt 32 and the second lifting belt 34 are thin strips, and their materials can be metal (e.g., aluminum, steel), plastic (e.g., PET), or plastic-steel, so that the first lifting belt 32 and the second lifting belt 34 are not easily bent or arbitrarily rolled into loops in the radial direction. In addition, as shown in Figures 1, 2, and 4, each of the first winding pulleys 24 has a first annular groove 242 for fixing the upper end of the first lifting belt 32 and for winding around it. When the middle beam 12 is operated to gradually approach the upper beam 10, the first winding pulley 24 is driven by the first rotating shaft 22 to rotate in one direction. The first lifting belt 32 is wound into the first annular groove 242 of the first winding pulley 24, and each turn of the first lifting belt 32 is roughly aligned and overlapped on top of the previous turn. Conversely, when the middle beam 12 is operated to gradually move away from the upper beam 10, the first lifting belt 32 is driven to be released from the first annular groove 242 of the first winding pulley 24 one turn at a time, and at the same time, the first winding pulley 24 drives the first rotating shaft 22 to rotate in the other direction. As shown in Figures 1, 2, and 6, each of the second winding pulleys 30 has a second annular groove 302 for fixing the upper end of the second lifting belt 34 and for winding around it. When the lower beam 14 is operated to gradually approach the upper beam 10, the second winding pulley 30 is driven by the second rotating shaft 28 to rotate in one direction. The second lifting belt 34 is wound into the second annular groove 302 of the second winding pulley 30, and each turn of the second lifting belt 34 is approximately aligned and overlapped on top of the previous turn. Conversely, as the lower beam 14 is gradually moved away from the upper beam 10, the second lifting belt 34 is released one turn at a time from the second annular groove 302 of the second winding pulley 30. Simultaneously, the second winding pulley 30 drives the second rotating shaft 28 to rotate in the opposite direction. This neat winding method ensures that the first lifting belt 32 and the second lifting belt 34 do not become entangled during the winding and releasing process by the first winding pulley 24 and the second winding pulley 30, thereby ensuring that the middle beam 12 and the lower beam 14 remain horizontal in any position.

Referring to Figures 2, 3, 4, and 5, the first power device 40 is installed inside the upper beam 10. The first power device 40 is connected to the first rotating shaft 22 and provides a driving force to the first rotating shaft 22, causing the first rotating shaft 22 to rotate in a direction inclined towards winding the first lifting belt 32. In this embodiment, the first power device 40 includes a first housing 42, a first spring storage wheel 44, a first drive wheel 46, a first spring 48, a first power conversion assembly 50, and a first transmission assembly 60.

The first housing 42 includes a first base 422 and a first cover 424. The first base 422 is disposed within the upper beam 10, and the first cover 424 is engaged and snapped with the first base 422 to form a space between them. The first spring wheel 44, the first drive wheel 46, and the first power converter 50 are sandwiched between the first cover 424 and the first base 422, and are sequentially and adjacently mounted on the first base 422, so that the first spring wheel 44, the first drive wheel 46, and the first power converter 50 can rotate relative to the first base 422. One end of the first spring 48 is connected to the first drive wheel 46, and the other end is wound around the first spring wheel 44. The first spring storage wheel 44 is an idler wheel. Depending on the rotation direction of the first drive wheel 46, it can cause the first spring 48 to be released from the first spring storage wheel 44 and wound around the first drive wheel 46, or to be released from the first drive wheel 46 and wound around the first spring storage wheel 44.

As shown in Figures 4 and 5, the first power transmission assembly 50 is arranged adjacent to the first drive wheel 46. The first power transmission assembly 50 includes a first tapered wheel 52, a second tapered wheel 54, and a first transmission rope 56. The first tapered wheel 52 and the second tapered wheel 54 have similar structures and are arranged in opposite directions, with the large-diameter end 522 of the first tapered wheel 52 corresponding to the small-diameter end 544 of the second tapered wheel 54. The smaller diameter end 524 of the first tapered wheel 52 corresponds to the larger diameter end 542 of the second tapered wheel 54. The first tapered wheel 52 has a gear 526 adjacent to its larger diameter end 522, and the second tapered wheel 54 has a gear 546 adjacent to its larger diameter end 542. The gear 526 of the first tapered wheel 52 meshes with the gear 462 of the first drive wheel 46, allowing the first drive wheel 46 and the first tapered wheel 52 to rotate synchronously. The two ends of the first transmission rope 56 are respectively connected to and can be wound around the first tapered wheel 52 and the second tapered wheel 54, enabling the first tapered wheel 52 and the second tapered wheel 54 to move in tandem. Through the cooperation of the first tapered wheel 52 and the second tapered wheel 54 in the aforementioned first power transmission assembly 50, the magnitude of the power output by the first spring 48 to the first transmission assembly 60 can be changed.

As shown in Figures 4 and 5, the first transmission assembly 60 is disposed adjacent to the first power conversion assembly 50 and the first rotating shaft 22. The first transmission assembly 60 includes a first driven member 62 and a first bushing 64. The first driven member 62 is rotatably mounted on the first base 422. The first driven member 62 has a first tooth 622 and a second tooth 624 connected to one end of the first tooth 622 and formed by an umbrella gear. The first tooth 622 of the first driven member 62 engages with the gear 546 of the second tapered wheel 54, enabling the first driven member 62 to rotate synchronously with the second tapered wheel 54.

As shown in Figures 4 and 5, the first bushing 64 has a first tube portion 642, a third tooth portion 644 composed of an umbrella gear, and a first shaft hole 646. The third tooth portion 644 is connected to one end of the first tube portion 642 and engages with the second tooth portion 624 of the first driven member 62, so that the first bushing 64 can rotate synchronously with the first driven member 62. Referring to Figure 5A, since both the second tooth 624 and the third tooth 644 are umbrella gears, in order to prevent the first bushing 64 from being unexpectedly displaced due to the mutual repulsion of the two umbrella gears during operation, the first housing 42 also has a first limiting hole 426 connecting the inside and outside of the housing. The first tube 642 of the first bushing 64 passes through the first limiting hole 426 and the outer periphery of the first tube 642 abuts against the hole wall of the first limiting hole 426. By limiting the first tube 642 with the first limiting hole 426 of the first housing 42, the first bushing 64 can be prevented from being displaced due to the mutual repulsion, so that the second tooth 624 and the third tooth 644 remain in contact. In this embodiment, the first limiting hole 426 is formed between the first cover 424 and the first base 422. In other embodiments, the first limiting hole may also be formed separately on the first cover or the first base, thus achieving the same limiting effect on the first bushing.

The first shaft hole 646 of the first bushing 64 penetrates the first tube portion 642 and the third tooth portion 644. The first shaft hole 646 is a polygonal hole that mates with the outer periphery of the first rotating shaft 22, allowing the first rotating shaft 22 to pass through, thereby enabling the first rotating shaft 22 and the first bushing 64 to rotate synchronously and in the same direction.

Referring to Figures 2, 3, 6, and 7, the second power device 70 is installed within the upper beam 10. The second power device 70 is connected to the second rotating shaft 28 and provides a driving force to the second rotating shaft 28, causing the second rotating shaft 28 to rotate in a direction inclined towards winding the second lifting belt 34. In this embodiment, the second power device 70 includes a second housing 72, a second spring storage wheel 74, a second drive wheel 76, a second spring 78, a second power conversion assembly 80, and a second transmission assembly 90.

The second housing 72 includes a second base 722 and a second cover 724. The second base 722 is disposed within the upper beam 10, and the second cover 724 is engaged and snapped with the second base 722 to form a space between them. The second spring wheel 74, the second drive wheel 76, and the second variable force assembly 80 are sandwiched between the second cover 724 and the second base 722, and are sequentially and adjacently mounted on the second base 722, so that the second spring wheel 74, the second drive wheel 76, and the second variable force assembly 80 can rotate relative to the second base 722. One end of the second spring 78 is connected to the second drive wheel 76, and the other end is wound around the second spring wheel 74. The second spring storage wheel 74 is an idler wheel. Depending on the rotation direction of the second drive wheel 76, it can cause the second spring 78 to be released from the second spring storage wheel 74 and wound around the second drive wheel 76, or released from the second drive wheel 76 and wound around the second spring storage wheel 74.

As shown in Figures 6 and 7, the second power transmission assembly 80 is arranged adjacent to the second drive wheel 76. The second power transmission assembly 80 includes a third tapered wheel 82, a fourth tapered wheel 84, and a second transmission rope 86. The third tapered wheel 82 and the fourth tapered wheel 84 have similar structures and are arranged in opposite directions, with the large-diameter end 822 of the third tapered wheel 82 corresponding to the small-diameter end 844 of the fourth tapered wheel 84. The small-diameter end 824 of the third tapered wheel 82 corresponds to the large-diameter end 842 of the fourth tapered wheel 84. The third tapered wheel 82 has a gear 826 adjacent to its large-diameter end 822, and the fourth tapered wheel 84 has a gear 846 adjacent to its large-diameter end 842. The gear 826 of the third tapered wheel 82 meshes with the gear 762 of the second drive wheel 76, allowing the second drive wheel 76 and the third tapered wheel 82 to rotate synchronously. The two ends of the second transmission rope 86 are respectively connected to and can be wound around the third tapered wheel 82 and the fourth tapered wheel 84, enabling the third tapered wheel 82 and the fourth tapered wheel 84 to move together. Through the cooperation of the third tapered wheel 82 and the fourth tapered wheel 84 of the aforementioned second power transmission assembly 80, the magnitude of the power output by the second spring 78 to the second transmission assembly 90 can be changed.

As shown in Figures 6 and 7, the second transmission assembly 90 is disposed adjacent to the second power transmission assembly 80 and the second rotating shaft 28. The second transmission assembly 90 includes a second driven member 92 and a second bushing 94. The second driven member 92 is rotatably mounted on the second base 722. The second driven member 92 has a fourth tooth 922 and a fifth tooth 924 connected to one end of the fourth tooth 922 and formed by an umbrella gear. The fourth tooth 922 of the second driven member 92 engages with the gear 846 of the fourth tapered wheel 84, allowing the second driven member 92 to rotate synchronously with the fourth tapered wheel 84.

As shown in Figures 6 and 7, the second bushing 94 has a second tube portion 942, a sixth tooth portion 944 composed of an umbrella gear, and a second shaft hole 946. The sixth tooth portion 944 is connected to one end of the second tube portion 942 and engages with the fifth tooth portion 924 of the second driven member 92, so that the second bushing 94 can rotate synchronously with the second driven member 92. Referring to Figure 7A, since both the fifth tooth 924 and the sixth tooth 944 are umbrella gears, in order to prevent the second bushing 94 from being unexpectedly displaced due to the mutual repulsion of the two umbrella gears during operation, the second housing 72 also has a second limiting hole 726 connecting the inside and outside of the housing. The second tube 942 of the second bushing 94 passes through the second limiting hole 726 and the outer periphery of the second tube 942 abuts against the hole wall of the second limiting hole 726. By limiting the second tube 942 with the second limiting hole 726 of the second housing 72, the second bushing 94 can be prevented from being displaced due to the mutual repulsion, so that the fifth tooth 924 and the sixth tooth 944 remain in contact. In this embodiment, the second limiting hole 726 is formed between the second cover 724 and the second base 722. In other embodiments, the second limiting hole may also be formed separately on the second cover or the second base, thus achieving the same limiting effect on the second bushing.

The second shaft hole 946 of the second bushing 94 penetrates the second tube portion 942 and the sixth tooth portion 944. The second shaft hole 946 is a polygonal hole that mates with the outer periphery of the second rotating shaft 28, allowing the second rotating shaft 28 to pass through, thereby enabling the second rotating shaft 28 and the second bushing 94 to rotate synchronously and in the same direction.

Please refer to Figures 1 and 2. Two first magnetic attractors 102 are provided on the side of the upper beam 10 facing the middle beam 12. Two second magnetic attractors 122 are provided on the middle beam 12 corresponding to the areas of the first magnetic attractors 102. One of the first magnetic attractors 102 and the second magnetic attractor is made of a magnet, while the other can be made of a magnet or a metal plate, or other material that attracts magnets. When the middle beam 12 is moved upwards to its highest point under force, the arrangement of the two first magnetic attractors 102 and the two second magnetic attractors 122 allows the upper beam 10 and the middle beam 12 to attract each other, thereby preventing light leakage due to gaps between them.

Please refer to Figures 1, 3, and 8 through 10 for an explanation of the state of each component when the middle beam 12 and the lower beam 14 of the double-sided opening curtain 1 are moved to different height positions.

When the double-opening curtain 1 is in the state shown in Figure 8, the middle beam 12 and the lower beam 14 are moved to the position furthest away from the upper beam 10. At this time, most of the first springs 48 are released from the first spring storage wheel 44 and wound around the first drive wheel 46, and most of the second springs 78 are released from the second spring storage wheel 74 and wound around the second drive wheel 76. Simultaneously, the first lifting belt 32 is almost entirely released from the first winding pulley 24, with only less than one turn remaining around it. Similarly, the second lifting belt 34 is almost entirely released from the second winding pulley 30, with only less than one turn remaining around it.

When gradually raising the center beam 12 from the state shown in Figure 8 to the state shown in Figure 1, the user can apply force to the center beam 12 by hand or with a push-pull lever to move it upwards. During this upward movement, the first spring 48 releases energy and simultaneously rewinds onto the first spring storage wheel 44. The rewinding of the first spring 48 drives the first drive wheel 46 to rotate. The first drive wheel 46 then drives the first winding pulley 24 to rotate through the first power conversion assembly 50, the first transmission assembly 60, and the first rotating shaft 22, thereby gradually rewinding and stacking the first lifting belt 32 onto the first winding pulley 24.

If the user continues to apply upward force to the middle beam 12, causing it to move to the state shown in Figure 9, the middle beam 12 is moved to the position closest to the upper beam 10. At this time, most of the first springs 48 are released from the first drive wheel 46 and rewind onto the first spring storage wheel 44. Almost all of the first lifting belt 32 is rewind onto the first winding pulley 24. At this point, the first magnetic 102 of the upper beam 10 and the second magnetic 122 of the middle beam 12 attract each other, thus maintaining the middle beam 12 at the position closest to the upper beam 10.

When the user applies force to the lower beam 14 to move it upward from the state shown in Figure 9, the second spring 78 releases energy and simultaneously rewinds onto the second storage spring wheel 74 during the upward movement of the lower beam 14. The rewinding of the second spring 78 drives the second drive wheel 76 to rotate, which in turn drives the second winding pulley 30 to rotate via the second power conversion assembly 80, the second transmission assembly 90, and the second rotating shaft 28, thereby gradually rewinding and stacking the second lifting belt 34 onto the second winding pulley 30. Subsequently, when the lower beam 14 is moved to its closest position to the upper beam 10, as shown in Figure 10, most of the second springs 78 are released from the second drive wheel 76 and rewind onto the second spring storage wheel 74, and almost all of the second lifting belt 34 is rewind onto the second winding pulley 30.

Furthermore, in this embodiment, when the bidirectional opening curtain 1 is in the state shown in Figure 10, the shielding structure 16 below the central beam 12 is completely stacked and rests against the lower beam 14. The weight of the shielding structure 16 is mainly borne by the lower beam 14. At this time, most of the second transmission ropes 86 of the second variable force assembly 80 are stacked on the third tapered wheel 82 (as shown in Figure 10A), and a rope extends from the third tapered wheel 82 near its small diameter end 824 to the fourth tapered wheel 84 near its large diameter end 842. This causes the second spring 78 to output a larger force to the second transmission assembly 90, and the output force is then transmitted to the lower beam 14 through the second rotating shaft 28 and the second lifting belt 34.

When the bidirectional opening curtain 1 is adjusted to the state shown in Figure 9, the weight of the shading structure 16 is only partially borne by the lower beam 14, while the majority is borne by the middle beam 12. At this time, most of the second transmission ropes 86 of the second variable force group 80 are stacked on the fourth tapered wheel 84 (as shown in Figure 9A), and a rope extends from the third tapered wheel 82 near the large diameter end 822 to the fourth tapered wheel 84 near the small diameter end 844, so that the second spring 78 outputs a smaller force to the second transmission group 90. The output force is also transmitted to the lower beam 14 through the second rotating shaft 28 and the second lifting belt 34. Furthermore, at this time, most of the first transmission ropes 56 of the first power transmission group 50 are stacked on the first tapered wheel 52 (as shown in Figure 9B), and a rope extends from the first tapered wheel 52 near its smaller diameter end 524 to the second tapered wheel 54 near its larger diameter end 542. This allows the first spring 48 to output a larger force to the first transmission group 60, and the output force is then transmitted to the center beam 12 through the first rotating shaft 22 and the first lifting belt 32.

When the bidirectional opening curtain 1 is adjusted to the state shown in Figure 8, the shielding structure 16 is fully stacked and rests against the lower beam 14. The weight of the shielding structure 16 is mainly borne by the lower beam 14, not by the middle beam 12. At this time, most of the first transmission ropes 56 of the first variable force assembly 50 are stacked on the second tapered wheel 54 (as shown in Figure 8A), and a rope extends from the first tapered wheel 52 near its large diameter end 522 to the second tapered wheel 54 near its small diameter end 544. This causes the first spring 48 to output a smaller force to the first transmission assembly 60, and the output force is then transmitted to the middle beam 12 through the first rotating shaft 22 and the first lifting belt 32.

In summary, the double-opening blind 1 of this invention allows users to directly adjust the positions of the center beam 12 and the bottom beam 14 using their hands or tools such as push-pull rods. Therefore, there is no need for exposed control rope loops. Furthermore, both the first lifting belt 32 and the second lifting belt 34 are composed of thin strips that are not easily bent or arbitrarily rolled into loops in their radial direction, thus effectively preventing the risk of children accidentally becoming entangled in the control rope loops.

The specific embodiments described above in the detailed explanation of the embodiments are merely for illustrating the technical content of this invention, and are not intended to narrowly limit this invention to the aforementioned embodiments. All variations and embodiments made without departing from the spirit of this invention and the scope of the following patent application are within the scope of this invention.

1: Two-way opening blinds

10: Raising the roof beam

102: First magnetic component

12: Zhongliang

122: Second magnetic chuck

14: Lower beam

16: Shielding Structure

20: First winding device

22: First Rotating Shaft

24: First winding pulley

26: Second winding device

28: Second Rotating Shaft

30: Second winding pulley

32: First lifting belt

34: Second lifting belt

40: First power unit

70: Second power unit

Claims (13)

A double-sided opening curtain includes: an upper beam; a middle beam movably positioned below the upper beam; a lower beam movably positioned below the middle beam; a shielding structure disposed between the middle beam and the lower beam; a first pivot rotatably disposed within the upper beam; a second pivot rotatably disposed within the upper beam; at least one first lifting belt, the first lifting belt being a thin strip, one end of the first lifting belt being connected to the middle beam and the other end being connected to the first pivot; at least one second lifting belt, the second lifting belt being a thin strip, one end of the second lifting belt being connected to the lower beam and the other end being connected to the second pivot; a first... A power device is disposed within the upper beam. The first power device is connected to the first rotating shaft and provides driving force to the first rotating shaft, causing the first rotating shaft to rotate in a direction inclined to wind the first lifting belt. The first power device includes: a first drive wheel; and a first spring, one end of which is connected to the first drive wheel. The first spring is wound or released from the first drive wheel depending on the rotation direction of the first drive wheel. When the middle beam is moved away from the upper beam, the first lifting belt moves with the middle beam, releases from the first rotating shaft, and drives the first rotating shaft to rotate, thereby driving the first drive wheel to rotate, causing the first lifting belt to wind the first lifting belt. A spring is wound around the first drive wheel and accumulates elastic force. When the middle beam is moved towards the upper beam, the first spring releases its elastic force due to the movement of the middle beam and is released from the first drive wheel, causing the first drive wheel to rotate in the opposite direction, thereby driving the first rotating shaft to rotate to retract the first lifting belt. A second power device is disposed in the upper beam. The second power device is connected to the second rotating shaft and provides driving force to the second rotating shaft, causing the second rotating shaft to rotate in a direction inclined to retract the second lifting belt. The second power device includes: a second drive wheel; and a second spring, one end of which is connected to the second drive wheel. The second spring is wound or released from the second drive wheel depending on the direction of rotation of the second drive wheel. Specifically, when the lower beam is moved away from the upper beam, the second lifting belt is released from the second rotating shaft as the lower beam moves, causing the second rotating shaft to rotate, which in turn drives the second drive wheel to rotate. This causes the second spring to wind around the second drive wheel and accumulate elastic force. When the lower beam is moved closer to the upper beam, the second spring releases its elastic force due to the movement of the lower beam and is released from the second drive wheel, causing the second drive wheel to rotate in the opposite direction, which in turn drives the second rotating shaft to rotate and retract the second lifting belt. The bidirectional opening blind as described in claim 1, wherein the first power device includes a first variable transmission assembly and a first transmission assembly, the first variable transmission assembly being connected to the first drive wheel, and the first transmission assembly being connected between the first variable transmission assembly and the first rotating shaft, wherein, through the transmission of the first variable transmission assembly and the first transmission assembly, rotation of one of the first drive wheel and the first rotating shaft will drive the other to rotate synchronously; the second power device includes a second variable transmission assembly and a second transmission assembly, the second variable transmission assembly being connected to the second drive wheel, and the second transmission assembly being connected between the second variable transmission assembly and the second rotating shaft, wherein, through the transmission of the second variable transmission assembly and the second transmission assembly, rotation of one of the second drive wheel and the second rotating shaft will drive the other to rotate synchronously. The bidirectional opening curtain as described in claim 2, wherein the first variable force assembly includes a first tapered wheel, a second tapered wheel, and a first drive rope, the first and second tapered wheels being arranged in opposite directions, and the two ends of the first drive rope being connected to and wound around the first and second tapered wheels respectively, thereby linking the first and second tapered wheels; the second variable force assembly includes a third tapered wheel, a fourth tapered wheel, and a second drive rope, the third and fourth tapered wheels being arranged in opposite directions, and the two ends of the second drive rope being connected to and wound around the third and fourth tapered wheels respectively, thereby linking the third and fourth tapered wheels. The bidirectional opening blind as described in claim 2, wherein the first transmission assembly includes a first bushing and a first driven member, the first rotating shaft passing through and connected to the first bushing, and the first driven member being located between the first variable force assembly and the first bushing, and being connected to both the first variable force assembly and the first bushing; the second transmission assembly includes a second bushing and a second driven member, the second rotating shaft passing through and connected to the second bushing, and the second driven member being located between the second variable force assembly and the second bushing, and being connected to both the second variable force assembly and the second bushing. The bidirectional opening curtain as described in claim 4, wherein the first driven member has a first tooth and a second tooth connected to one end of the first tooth; the first bushing has a first tube and a third tooth, the third tooth being disposed at one end of the first tube and engaging with the second tooth; the second driven member has a fourth tooth and a fifth tooth connected to one end of the fourth tooth; the second bushing has a second tube and a sixth tooth, the sixth tooth being disposed at one end of the second tube and engaging with the fifth tooth. As described in claim 5, in a bidirectional opening curtain, the second tooth of the first driven member and the third tooth of the first bushing are corresponding umbrella gear structures; the fifth tooth of the second driven member and the sixth tooth of the second bushing are corresponding umbrella gear structures. As described in claim 6, the bidirectional opening curtain, wherein the first power device further includes a first housing having a first limiting hole, the first tube portion of the first bushing passing through the first limiting hole, and the outer periphery of the first tube portion abutting against the wall of the first limiting hole; the second power device further includes a second housing having a second limiting hole, the second tube portion of the second bushing passing through the second limiting hole, and the outer periphery of the second tube portion abutting against the wall of the second limiting hole. The bidirectional opening blind as described in claim 7, wherein the first housing includes a mating first base and a first cover, and a first limiting hole is formed between the first base and the first cover; the second housing includes a mating second base and a second cover, and a second limiting hole is formed between the second base and the second cover. As described in claim 5, the bidirectional opening curtain comprises: a first bushing having a first shaft hole passing through the first tube and the third tooth, the shape of the first shaft hole matching the shape of the first rotating shaft and allowing the first rotating shaft to pass through it, so that the first rotating shaft and the first bushing rotate synchronously; and a second bushing having a second shaft hole passing through the second tube and the sixth tooth, the shape of the second shaft hole matching the shape of the second rotating shaft and allowing the second rotating shaft to pass through it, so that the second rotating shaft and the second bushing rotate synchronously. The bidirectional opening blind as described in claim 2 further includes a first winding pulley and a second winding pulley. A first rotating shaft passes through and is connected to the first winding pulley. The upper end of a first lifting belt is connected to the first winding pulley and can be wound or released from it. A second rotating shaft passes through and is connected to the second winding pulley. The upper end of a second lifting belt is connected to the second winding pulley and can be wound or released from it. The bidirectional opening blind as described in claim 10, wherein the first pulley has a first annular groove, the first lifting belt is wound around or released from the first annular groove, and each turn of the first lifting belt is substantially aligned and overlaps another turn; the second pulley has a second annular groove, the second lifting belt is wound around or released from the second annular groove, and each turn of the second lifting belt is substantially aligned and overlaps another turn. As described in claim 1, the double-opening curtain has a first magnetic attractor on the side of the upper beam facing the middle beam, and a second magnetic attractor in the area of the middle beam corresponding to the first magnetic attractor, so that the upper beam and the middle beam attract each other. The bidirectional opening curtain as described in claim 1, wherein the first power device further includes a first base and a first cover, the first base being disposed within the upper beam, the first cover being disposed on the first base, and the first drive wheel and the first spring being sandwiched between the first cover and the first base; the second power device further includes a second base and a second cover, the second base being disposed within the upper beam, the second cover being disposed on the second base, and the second drive wheel and the second spring being sandwiched between the second cover and the second base.