Curtain and its spring drive system

Abstract

The spring drive system suitable for curtains includes: a shell part, having a first end and a second end relative to each other; a rope drum and a first gear, which are fixedly connected to each other and pivotally connected to the shell part, and the rope drum is connected to the first suspension rope and the second suspension rope respectively; the second gear is pivotally connected to the shell part; the first spring shaft and the second spring shaft are pivotally connected to the opposite sides of the second gear respectively; the third gear is pivotally connected to the shell part and meshes with the first gear and the second gear respectively; and a first spring and a second spring, the first spring is assembled around the first spring shaft and one end of the first spring is fixedly connected to the first receiving shaft, and the second spring is assembled around the second spring shaft and one end of the second spring is fixedly connected to the second receiving shaft; wherein the first rope drum, the third gear and the second gear are arranged in sequence in the direction from the first end to the second end in the shell part, and a plurality of guide members are also provided in the shell part to guide the first suspension rope and the second suspension rope in the shell.

Description

[0001] This application is a divisional application of the invention patent application with application date of September 25, 2018, application number 201811119297.8, and invention name “Curtain and its spring drive system”. Technical Field

[0002] The present invention relates to a curtain and a spring drive system thereof. Background Art

[0003] There are many types of window blinds available on the market, such as Venetian blinds, Roman shades, and cellular shades. When lowered, these shades can shade windows, reducing light entering a room and increasing privacy. Typically, these blinds have a control cord that raises or lowers the bottom rail. Specifically, a roller retracts a suspension element to raise the bottom rail, and the suspension element can be unrolled from the roller to lower the bottom rail.

[0004] However, concerns about cords potentially strangulating children have led to the development of cordless window treatments. These cordless window treatments use an electric motor or coil spring cassette to raise and lower the bottom rail. Coil spring cassettes typically consist of multiple springs that provide torque to maintain the bottom rail at the desired height. However, coil spring cassettes are often complex components and cannot easily accommodate different window treatment sizes or styles.

[0005] Therefore, there is a need for a spring drive system suitable for curtains that can at least solve the above problems. Summary of the Invention

[0006] One object of the present invention is to provide a curtain and a spring drive system suitable for the curtain. According to one embodiment, a spring drive system suitable for the curtain includes: a housing having a first end and a second end opposite to each other; a first rope drum and a first gear, which are fixedly connected and pivotally connected to the housing, and the first rope drum is connected to a first suspension rope and a second suspension rope respectively; a second gear, which is pivotally connected to the housing; a first spring shaft and a second spring shaft, which are pivotally connected to opposite sides of the second gear, so that the first spring shaft and the second spring shaft can rotate relative to the second gear respectively, and the second gear, the first spring shaft and the second spring shaft are coaxially arranged; a third gear, which is pivotally connected to the housing and meshes with the first gear and the second gear respectively, and opposite sides of the third gear are fixedly connected to a first receiving shaft and a second receiving shaft respectively; a first spring and a second spring, the first spring being assembled around the first spring shaft and one end of the first spring being fixedly connected to the first receiving shaft, the second spring being assembled around the second spring shaft and one end of the second spring being fixedly connected to the second receiving shaft; a second rope drum and a fourth gear, which are and a gear engaged with the gear train of claim 1, wherein the gear train is secured to a first end of the second gear train and a second end of the second gear train, wherein the gear train is engaged with the gear train of the first and second gear trains and the gear train is engaged with the gear train of the first and second gear trains.

[0007] According to one embodiment, the first rope drum, the third gear, the second gear, the fifth gear, the sixth gear, and the fourth gear are sequentially arranged in the housing along a direction from the first end to the second end.

[0008] According to one embodiment, the second gear and the fifth gear are disposed close to each other in the housing.

[0009] According to one embodiment, a plurality of guide members are further provided in the housing to guide the first suspension rope, the second suspension rope, the third suspension rope and the fourth suspension rope in the housing.

[0010] According to one embodiment, the first suspension rope and the third suspension rope extend adjacent to and parallel to two opposite side edges of the housing between the first end and the second end.

[0011] According to one embodiment, the first suspension cord and the second suspension cord are suitable for coupling to the bottom of the curtain, and the third suspension cord and the fourth suspension cord are suitable for coupling to the middle rail of the curtain.

[0012] According to one embodiment, the shell includes a first shell portion and a second shell portion, the first shell portion can be fixedly connected to the second shell portion, the first shell portion is equipped with the first rope drum, the first gear, the second gear, the third gear, the first spring shaft, the second spring shaft, the first receiving shaft, the second receiving shaft, the first spring and the second spring, and the second shell portion is equipped with the second rope drum, the fourth gear, the fifth gear, the sixth gear, the third spring shaft, the fourth spring shaft, the third receiving shaft, the fourth receiving shaft, the third spring and the fourth spring.

[0013] According to one embodiment, the pivot axes of the first to sixth gears are all distributed along the same straight line.

[0014] According to one embodiment, a curtain includes: a top rail, a bottom rail and a middle rail, the middle rail being located between the top rail and the bottom; a shielding structure having a first end and a second end, the first end and the second end being respectively arranged adjacent to the middle rail and the bottom; and the spring drive system, wherein the shell of the spring drive system is fixedly connected to the top rail, the ends of the first suspension rope and the second suspension rope are respectively fixedly connected to the bottom, and the ends of the third suspension rope and the fourth suspension rope are respectively fixedly connected to the middle rail.

[0015] According to another embodiment, a spring drive system suitable for a curtain includes: a housing having a first end and a second end opposite to each other; a first rope drum and a first gear, which are fixedly connected to each other and pivotally connected to the housing, the first rope drum being connected to a first suspension rope and a second suspension rope respectively; a second gear being pivotally connected to the housing; a first spring shaft and a second spring shaft, which are pivotally connected to opposite sides of the second gear respectively, so that the first spring shaft and the second spring shaft can rotate relative to the second gear respectively, and the second gear, the first spring shaft and the second spring shaft are coaxially arranged; a third gear is pivotally connected to the housing and meshes with the first gear and the second gear respectively, and opposite sides of the third gear are fixedly connected to the first receiving shaft and the second receiving shaft respectively; a first spring and a second spring, the first spring being assembled around the first spring shaft and one end of the first spring being fixedly connected to the first receiving shaft, the second spring being assembled around the second spring shaft and one end of the second spring being fixedly connected to the second receiving shaft; the second rope drum and a fourth gear are fixedly connected to each other and pivotally connected to the housing, The second rope drum is connected to the third suspension rope and the fourth suspension rope respectively; the fifth gear is pivotally connected to the housing; the third spring shaft and the fourth spring shaft are pivotally connected to the opposite sides of the fifth gear respectively, so that the third spring shaft and the fourth spring shaft can rotate relative to the fifth gear respectively, and the fifth gear, the third spring shaft and the fourth spring shaft are coaxially arranged; the sixth gear is pivotally connected to the housing and meshes with the fourth gear and the fifth gear respectively, and the opposite sides of the sixth gear are fixedly connected to the third receiving shaft and the fourth receiving shaft respectively; and the third spring and the fourth spring, the third spring is assembled around the third spring shaft and one end of the third spring is fixedly connected to the third receiving shaft, the fourth spring is assembled around the fourth spring shaft and one end of the fourth spring is fixedly connected to the fourth receiving shaft; wherein the first rope drum, the third gear, the second gear, the fifth gear, the sixth gear and the fourth gear are arranged in sequence in the direction from the first end to the second end in the housing, and the second gear is meshed with the fifth gear.

[0016] According to one embodiment, the first suspension rope and the second suspension rope extend from the first end portion of the housing, and the third suspension rope and the fourth suspension rope extend from the second end portion of the housing.

[0017] According to one embodiment, the first suspension cord, the second suspension cord, the third suspension cord and the fourth suspension cord are suitable for coupling to the bottom of a curtain.

[0018] According to one embodiment, the shell includes a first shell portion and a second shell portion, the first shell portion can be fixedly connected to the second shell portion, the first shell portion is equipped with the first rope drum, the first gear, the second gear, the third gear, the first spring shaft, the second spring shaft, the first receiving shaft, the second receiving shaft, the first spring and the second spring, and the second shell portion is equipped with the second rope drum, the fourth gear, the fifth gear, the sixth gear, the third spring shaft, the fourth spring shaft, the third receiving shaft, the fourth receiving shaft, the third spring and the fourth spring.

[0019] According to one embodiment, the pivot axes of the first to sixth gears are all distributed along the same straight line.

[0020] According to one embodiment, a curtain includes: a top rail and a bottom; a shielding structure having a first end and a second end, the first end and the second end being respectively arranged adjacent to the top rail and the bottom; and the spring drive system, wherein the shell of the spring drive system is fixedly connected to one of the top rail and the bottom, and the ends of the first suspension cord, the second suspension cord, the third suspension cord and the fourth suspension cord are fixedly connected to the other of the top rail and the bottom.

[0021] According to another embodiment, a spring drive system suitable for a curtain includes: a housing portion having a first end portion and a second end portion opposite to each other; a rope drum and a first gear fixedly connected to each other and pivotally connected to the housing portion, the rope drum being connected to a first suspension rope and a second suspension rope respectively; a second gear being pivotally connected to the housing portion; a first spring shaft and a second spring shaft being pivotally connected to opposite sides of the second gear respectively, so that the first spring shaft and the second spring shaft can respectively rotate relative to the second gear, and the second gear, the first spring shaft and the second spring shaft are coaxially arranged; a third gear being pivotally connected to the housing portion and meshing with the first gear and the second gear respectively, and opposite sides of the third gear are respectively connected to the first receiving shaft , a second receiving shaft is fixedly connected; and a first spring and a second spring, the first spring is assembled around the first spring shaft and one end of the first spring is fixedly connected to the first receiving shaft, the second spring is assembled around the second spring shaft and one end of the second spring is fixedly connected to the second receiving shaft; wherein the first rope drum, the third gear and the second gear are arranged in sequence in the direction from the first end to the second end in the housing part, and a plurality of guide members are also provided in the housing part to facilitate guiding the first suspension rope and the second suspension rope in the housing, the second suspension rope extends out of the first end of the housing part, and the first suspension rope can selectively extend out of one of the first end and the second end of the housing part.

[0022] According to one embodiment, the housing portion, the rope drum, the first suspension rope, the second suspension rope, the first spring shaft, the second spring shaft, the first receiving shaft, the second receiving shaft, the first spring, the second spring and the first to third gears constitute an expandable component, which can be selectively used alone or in adjacent connection with another component of the same structure.

[0023] According to one embodiment, the second end portion of the housing portion of the component may be fixedly connected to the second end portion of the housing portion of the other component.

[0024] According to one embodiment, when the component is adjacently engaged with the other component for use, the first suspension cord may be guided through the interior of the housing portion of the other component. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG2 is an exploded view of a spring drive system for a curtain according to an embodiment of the present invention.

[0026] Figure 2 Draw Figure 1 Cross-sectional view of the spring drive system.

[0027] Figure 3 Draw Figure 1 Plan view of the spring drive system.

[0028] Figure 4 An embodiment of the present invention is shown. Figure 1-3 Front view of the spring drive system for curtains.

[0029] Figure 5 Draw Figure 4 Exploded view of the curtains.

[0030] Figure 6 Draw Figure 4 A perspective view of the bottom portion of the curtain in the fully raised position.

[0031] Figure 7 Draw Figure 4 A perspective view of the bottom portion of the curtain in the lowered position.

[0032] Figure 8 Draw Figure 4 A plan view of the spring drive system in the curtain when it is in operation.

[0033] Figure 9 FIG. 1 is an exploded view of a spring drive system provided by another embodiment of the present invention.

[0034] Figure 10 Draw Figure 9 Cross-sectional view of the spring drive system.

[0035] Figure 11 Draw Figure 9 Plan view of the spring drive system.

[0036] Figure 12 An embodiment of the present invention is shown. Figure 9-11 A perspective view of a window curtain with a spring drive system is shown.

[0037] Figure 13 Draw Figure 12 Exploded view of the curtains.

[0038] Figure 14 Another embodiment of the present invention is shown. Figure 9-11 A perspective view of a window curtain with a spring drive system is shown.

[0039] Figure 15 Draw Figure 14 Exploded view of the curtains.

[0040] Figure 16 Draw Figure 14 A plan view of the spring drive system in the curtain when it is in operation.

[0041] Figure 17 Draw Figure 14 A plan view of the spring drive system in the curtain when it is in operation.

[0042] Figure 18 Draw Figure 14 A perspective view of a variation of a curtain.

[0043] Figure 19 FIG. 1 is an exploded view of a spring drive system provided by another embodiment of the present invention.

[0044] Figure 20 Draw Figure 19 Plan view of the spring drive system.

[0045] Figure 21 An embodiment of the present invention is shown. Figure 20 Exploded view of the window shade with spring drive system shown. DETAILED DESCRIPTION

[0046] Figure 1 FIG. 1 is an exploded view of a spring drive system 100 for curtains according to an embodiment of the present invention. Figure 2 A cross-sectional view of the spring drive system 100 is shown. Figure 3 FIG. 1 shows a plan view of the spring drive system 100. Figure 1-3The spring drive system 100 includes a housing 102, a rope drum 104, two suspension ropes 106 and 108, three gears 110A, 110B, and 110C, two springs 112 and 114, two spring shafts 116 and 118, and two receiving shafts 120 and 122. According to one embodiment, the housing 102 may include two covers 124 and 126, which may be fixed together by screws 128 and at least partially define the interior of the housing 102. The rope drum 104, the gears 110A, 110B, and 110C, the springs 112 and 114, the spring shafts 116 and 118, and the receiving shafts 120 and 122 may be disposed in the interior of the housing 102 between the covers 124 and 126.

[0047] See Figure 1 and Figure 2 The rope drum 104 is fixedly connected to the gear 110A and is respectively connected to the two suspension ropes 106 and 108. According to one embodiment, the rope drum 104 may have two fixed rope drum portions 104A and 104B, and the end 106A of the suspension rope 106 and the end 108A of the suspension rope 108 may be respectively connected to the rope drum portions 104A and 104B.

[0048] Gear 110A and the rope drum 104, which is comprised of rope drum portions 104A and 104B, are coaxially arranged. According to one embodiment, gear 110A may be fixedly coupled to the rope drum 104, with rope drum portions 104A and 104B located on opposite sides of gear 110A. The rope drum 104 and the gear 110A to which it is attached may be pivotally coupled to the housing 102 about a pivot axis 130A. For example, the housing 102 may be fixedly coupled to a shaft portion 132A, and the rope drum 104 and gear 110A may be pivotally coupled to the housing 102 at the shaft portion 132A. The rope drum 104 and gear 110A may rotate together relative to the housing 102 about the pivot axis 130A to reel in or out the two suspension ropes 106 and 108.

[0049] See Figure 1-3 The gear 110B can be pivotally connected to the housing 102 about a pivot axis 130B. For example, the housing 102 can be fixed to a shaft 132B, and the gear 110B can be pivotally connected to the housing 102 at the shaft 132B. In this way, the gear 110B can rotate in any direction relative to the housing 102 about the pivot axis 130B.

[0050] The two spring shafts 116 and 118 are coaxially arranged with the gear 110B, and the spring shafts 116 and 118 are pivotally connected to opposite sides of the gear 110B. For example, the gear 110B may be fixedly connected to two coaxial shafts 134A and 134B, where the shafts 134A and 134B protrude from opposite sides of the gear 110B, and the two spring shafts 116 and 118 may be pivotally connected to the two shafts 134A and 134B. Therefore, the spring shafts 116 and 118 can rotate independently about the pivot axis 130B relative to the gear 110B and the housing 102.

[0051] See Figure 1-3 Gear 110C is pivotally connected to housing 102 about pivot axis 130C and is fixedly connected to two receiving shafts 120 and 122 on opposite sides thereof. For example, housing 102 may be fixedly connected to shaft portion 132C, and gear 110C may be pivotally connected to housing 102 at shaft portion 132C. Gear 110C and the two receiving shafts 120 and 122 are coaxially arranged, allowing gear 110C and the receiving shafts 120 and 122 to rotate together relative to housing 102 about pivot axis 130C. In addition, gear 110C also meshes with gears 110A and 110B, respectively, allowing the three gears 110A, 110B, and 110C and the two receiving shafts 120 and 122 to rotate in conjunction. According to one embodiment, the pivot axis 130A of gear 110A, the pivot axis 130B of gear 110B, and the pivot axis 130C of gear 110C are all arranged along the same straight line.

[0052] Springs 112 and 114 are both wound ribbon-type springs and can be coaxially assembled about pivot axis 130B. More specifically, spring 112 can be assembled about spring axis 116, with first end 112A of spring 112 adjacent to spring axis 116 (first end 112A of spring 112 may or may not contact spring axis 116), and second end 112B of spring 112 fixedly attached to receiving axis 120. Similarly, spring 114 can be assembled about spring axis 118, with first end 114A of spring 114 adjacent to spring axis 118 (first end 114A of spring 114 may or may not contact spring axis 118), and second end 114B of spring 114 fixedly attached to receiving axis 122. When the rope drum 104 rotates in a direction that unwinds the two suspension ropes 106 and 108, the two springs 112 and 114 can be unwound from the two spring shafts 116 and 118, respectively, and wound around the two receiving shafts 120 and 122, respectively. Furthermore, the two springs 112 and 114 can also be unwound from the two receiving shafts 120 and 122, respectively, and wound around the two spring shafts 116 and 118, respectively, thereby causing the rope drum 104 to rotate in a direction that retracts the two suspension ropes 106 and 108. The provision of the two spring shafts 116 and 118 facilitates the unwinding and retracting of the springs 112 and 114, and does not necessarily rotate synchronously with the springs 112 and 114.

[0053] See Figure 1-3 The spring drive system 100 may further include a guide rope structure to facilitate guiding the two suspension ropes 106 and 108 in the housing 102. For example, the guide rope structure may include a plurality of guide members 136 for guiding the suspension ropes 108 and a plurality of guide members 138 for guiding the suspension ropes 106. The guide members 136 and 138 may be connected to the housing 102 and may be, for example, fixed shafts, pulleys, etc. The suspension rope 106 may contact the guide members 138 and extend into the housing 102, while the suspension rope 108 may contact the guide members 136 and extend into the housing 102.

[0054] The two suspension cords 106, 108 may extend in the housing 102 and extend out of the two opposite ends 102A, 102B thereof, or extend out of the same end of the housing 102 (ie, one of the two ends 102A, 102B). Figure 2 、 3In the illustrated embodiment, the suspension cord 106 can extend from the cord drum 104 through the gears 110B and 110C, the springs 112 and 114, the spring shafts 116 and 118, and the receiving shafts 120 and 122 to the end 102B of the housing 102, and then extend out of the end 102B of the housing 102. More specifically, the suspension cord 106 can extend, for example, adjacent to and parallel to the side edge of the housing 102 between the ends 102A and 102B. The suspension cord 108 can extend from the cord drum 104 to the end 102A of the housing 102 in the opposite direction of the suspension cord 106, and then extend out of the end 102A of the housing 102. According to one embodiment, the suspension cord 108 can extend higher within the housing 102 than the suspension cord 106.

[0055] Cooperate Figure 1-3 , Figure 4 and Figure 5 The front view and exploded view of a curtain 200 equipped with a spring drive system 100 according to an embodiment of the present invention are respectively shown. The curtain 200 may be a cordless curtain, wherein a cordless curtain refers to a curtain that does not require an exposed control cord. Figure 4 、 5 The window covering 200 may include a top rail 202, a shielding structure 204, and a base 206 disposed at the bottom end of the shielding structure 204. The top rail 202 may be of any type and shape. The top rail 202 may be fixed to the top of the window, and the shielding structure 204 and the base 206 may be hung from the top rail 202.

[0056] The shielding structure 204 can be any suitable structure. For example, the shielding structure 204 can be a honeycomb structure of woven material (as shown in the figure), a blind, or a plurality of vertically distributed and parallel plates. The opposite ends 204A and 204B of the shielding structure 204 can be respectively disposed adjacent to the top rail 202 and the bottom 206. For example, the shielding structure 204 can have a honeycomb structure, and the first end 204A of the shielding structure 204 can be provided with a fixing plate 208, and the fixing plate 208 can be inserted into the top rail 202 to secure the first end 204A of the shielding structure 204 to the top rail 202. The two opposite side ends of the top rail 202 can be closed by two side covers 210A and 210B, respectively, to facilitate the confinement of the fixing plate 208 in the top rail 202. Similarly, a fixing piece 212 may be provided at the second end 204B of the shielding structure 204, and the fixing piece 212 may be inserted into the bottom 206 to securely connect the second end 204B of the shielding structure 204 to the bottom 206. The two opposite side ends of the bottom 206 may be respectively closed by two side covers 214A and 214B to confine the fixing piece 212 in the bottom 206.

[0057] The bottom portion 206 can move vertically relative to the top rail 202 to extend or collapse the shield structure 204. According to one embodiment, the bottom portion 206 can be an elongated rail. The bottom portion 206 can be secured to a handle 206A to facilitate user manipulation of the bottom portion 206. Furthermore, the bottom portion 206 can be secured to a weight 216 to increase its stability.

[0058] See Figure 1-5 The spring drive system 100 can be installed in the top rail 202 or the bottom rail 206 of the curtain 200 to maintain the shading structure 204 and the bottom rail 206 at any desired height. Figure 1-5 In the illustrated embodiment, the housing 102 of the spring drive system 100 is fixed to the top rail 202, for example, via screws 217, while the ends 106B and 108B of the suspension cords 106 and 108 may be fixed to the base 206. However, the present invention is not limited thereto. According to other embodiments, the housing 102 of the spring drive system 100 may be fixed to the base 206, while the ends 106B and 108B of the suspension cords 106 and 108 may be fixed to the top rail 202. In addition, the shielding structure 204 may further include a plurality of grommets 218, through which the suspension cords 106 and 108 may pass through the shielding structure 204.

[0059] By means of the aforementioned combined structure, the two springs 112 and 114 of the spring drive system 100 can offset the gravity of the bottom 206, so that the bottom 206 can maintain a stationary state at any height. Figure 6 The bottom portion 206 of the window covering 200 is shown in the fully raised position. Figure 7 The bottom portion 206 of the window covering 200 is shown in the lowered position.

[0060] When the bottom 206 is in the fully raised position, the two springs 112, 114 of the spring drive system 100 are substantially wound around the two spring shafts 116, 118 and can generate a force to maintain the bottom 206 in a stationary state. Moreover, the two suspension ropes 106, 108 are substantially wound around the rope drum 104. The aforementioned state of the spring drive system 100 corresponds to Figure 3 .

[0061] When the bottom portion 206 moves downward (e.g., by being pulled down by a user), the two suspension ropes 106 and 108 can be unwound from the rope drum 104, and the rope drum 104 can rotate synchronously with the gears 110A, 110B, 110C and the receiving shafts 120 and 122. As a result, the two springs 112 and 114 can be unwound from the two spring shafts 116 and 118 and wound around the two receiving shafts 120 and 122, respectively. Figure 8 This is to show the spring drive system 100 corresponding to the aforementioned state.

[0062] When the bottom 206 moves toward the top rail 202 (e.g., pushed up by the user), the two springs 112 and 114 can be respectively unwound from the two receiving shafts 120 and 122 and wound around the two spring shafts 116 and 118, and generate a force to cause the rope drum 104 to rotate in the direction of winding the two suspension ropes 106 and 108.

[0063] The spring drive system 100 can be expanded as needed, so that the spring drive system 100 includes multiple identical components consisting of the rope drum 104, two suspension ropes 106, 108, three gears 110A, 110B, 110C, two springs 112, 114, two spring shafts 116, 118 and two receiving shafts 120, 122. Figure 9 FIG. 1 is an exploded view of a spring drive system 100A according to another embodiment of the present invention, which includes a plurality of identical components composed of the aforementioned elements. Figure 10 A cross-sectional view of the spring drive system 100A is shown. Figure 11 A plan view of the spring drive system 100A is shown. Figure 9-11 Spring drive system 100A includes a rope drum 104, two suspension ropes 106 and 108, three gears 110A, 110B, and 110C, two springs 112 and 114, two spring shafts 116 and 118, and two receiving shafts 120 and 122, forming assembly 142A, similar to the previous embodiment. Assembly 142A may be supported by two covers 124 and 126, which may form housing portion 102C of housing 102.

[0064] In addition, the spring drive system 100A may include another assembly 142B, which includes a rope drum 144, two suspension ropes 146 and 148, three gears 150A, 150B, and 150C, two springs 152 and 154, two spring shafts 156 and 158, and two receiving shafts 160 and 162. Assembly 142B may be supported by another housing portion 102D of the housing 102, wherein the housing portion 102D may be composed of two covers 164 and 166 fixedly connected via screws 167.

[0065] See Figure 9-11Components 142A and 142B have identical structures. As described above, the rope drum 144 and gear 150A of component 142B are coaxially arranged and fixedly connected, and are pivotally connected to the housing portion 102D about a pivot axis 168A. The two suspension ropes 146 and 148 are connected to the rope drum portions 144A and 144B of the rope drum 144 on opposite sides of the gear 150A, respectively. Gear 150B is pivotally connected to the housing portion 102D about a pivot axis 168B, while the two spring shafts 156 and 158 are pivotally connected to opposite sides of the gear 150B and are coaxially arranged with the gear 150B. This allows the spring shafts 156 and 158 to rotate independently about the pivot axis 168B relative to the gear 150B and the housing portion 102D. Gear 150C is pivotally connected to housing portion 102D about pivot axis 168C, meshing with gears 150A and 150B, respectively, and fixedly connected to two receiving shafts 160 and 162 on opposite sides thereof. Spring 152 is a wound ribbon-type spring assembled around a spring shaft 156. A first end 152A of spring 152 is adjacent to spring shaft 156 (first end 152A of spring 152 may or may not contact spring shaft 156), while a second end 152B of spring 152 is fixedly connected to receiving shaft 160. Similarly, spring 154 is a coiled ribbon-type spring assembled around a spring shaft 158. A first end 154A of spring 154 is adjacent to spring shaft 158 ​​(first end 154A of spring 154 may or may not contact spring shaft 158), while a second end 154B of spring 154 is fixedly connected to receiving shaft 162. The provision of the two spring shafts 156 and 158 facilitates the deployment and retraction of springs 152 and 154, and does not necessarily rotate synchronously with springs 152 and 154.

[0066] Housing portion 102C can be fixedly coupled to housing portion 102D, placing assemblies 142A and 142B adjacent to each other. Gears 110A, 110B, 110C of assembly 142A and gears 150A, 150B, 150C of assembly 142B can each form two independently actuated gear trains, with corresponding pivot axes 130A, 130B, 130C, 168A, 168B, 168C arranged along the same straight line.

[0067] In the spring drive system 100A, when the rope drum 104 rotates in a direction that unwinds the two suspension ropes 106 and 108, the two springs 112 and 114 can be unwound from the two spring shafts 116 and 118, respectively, and wound around the two receiving shafts 120 and 122, respectively. Furthermore, the two springs 112 and 114 can also be unwound from the two receiving shafts 120 and 122, respectively, and wound around the two spring shafts 116 and 118, respectively, thereby causing the rope drum 104 to rotate in a direction that retracts the two suspension ropes 106 and 108. Similarly, when the rope drum 144 rotates in a direction that unwinds the two suspension ropes 146 and 148, the two springs 152 and 154 can be unwound from the two spring shafts 156 and 158, respectively, and wound around the two receiving shafts 160 and 162, respectively. In addition, the two springs 152 , 154 can be respectively unwound from the two receiving shafts 160 , 162 and respectively wound around the two spring shafts 156 , 158 , thereby causing the rope drum 144 to rotate in a direction of winding up the two suspension ropes 146 , 148 .

[0068] See Figure 9-11 The suspension rope 106 can extend from the rope drum 104 through the gears 110B and 110C of the assembly 142A, the gears 150A, 150B, and 150C of the assembly 142B, and the rope drum 144 to the end 102B of the housing 102, and then extend out of the end 102B of the housing 102. The suspension rope 108 extends from the rope drum 104 to the end 102A of the housing 102 in the opposite direction of the suspension rope 106, and then extend out of the end 102A of the housing 102. The suspension rope 146 can extend from the rope drum 144 through the gears 150B and 150C of the assembly 142B, the gears 110A, 110B, and 110C of the assembly 142A, and the rope drum 104 to the end 102A of the housing 102, and then extend out of the end 102A of the housing 102. The suspension cord 148 extends from the rope drum 144 to the end 102B of the housing 102 in the opposite direction of the suspension cord 146, and extends out of the end 102B of the housing 102. According to one embodiment, the suspension cords 106 and 146 extending within the housing 102 are lower than the suspension cords 108 and 148. The housing 102 may further be provided with a plurality of guide members 170, 172, 174, and 176 to facilitate guiding the suspension cords 106, 108, 146, and 148 within the housing 102. For example, the suspension cords 106 and 146 may extend adjacent to and parallel to two opposing side edges of the housing 102 between the two ends 102A and 102B.

[0069] Cooperate Figure 9-11 , Figure 12 and Figure 13 The three-dimensional view and exploded view of a curtain 200A equipped with a spring drive system 100A according to an embodiment of the present invention are respectively shown. Figure 9-13The window covering 200A may have substantially the same structure as the window covering 200 described above, including a top rail 202, a shielding structure 204, and a bottom portion 206. The housing 102 of the spring drive system 100A may be fixedly connected to the top rail 202, while the end 106B of the suspension cord 106, the end 108B of the suspension cord 108, the end 146B of the suspension cord 146, and the end 148B of the suspension cord 148 may be fixedly connected to the bottom portion 206. However, the present invention is not limited thereto. According to other embodiments, the housing 102 of the spring drive system 100A may be fixedly connected to the bottom portion 206, while the ends of the suspension cords 106, 108, 146, and 148 may be fixedly connected to the top rail 202.

[0070] As the bottom rail 206 of the window covering 200A moves up and down relative to the head rail 202, the two components 142A and 142B of the spring drive system 100A can be actuated in the same manner as described above. For example, as the bottom rail 206 moves downward, the two suspension cords 106 and 108 can be unwound from the cord drum 104, and the two springs 112 and 114 can be unwound from the two spring shafts 116 and 118 and wound around the two receiving shafts 120 and 122, respectively. Meanwhile, the two suspension cords 146 and 148 can be unwound from the cord drum 144, and the two springs 152 and 154 can be unwound from the two spring shafts 156 and 158 and wound around the two receiving shafts 160 and 162, respectively.

[0071] When the base 206 moves toward the top rail 202, the two springs 112 and 114 can be respectively unwound from the two receiving shafts 120 and 122 and wound around the two spring shafts 116 and 118, thereby generating a force to cause the rope drum 104 to rotate in a direction to reel in the two suspension ropes 106 and 108. Similarly, the two springs 152 and 154 can be respectively unwound from the two receiving shafts 160 and 162 and wound around the two spring shafts 156 and 158, thereby generating a force to cause the rope drum 144 to rotate in a direction to reel in the two suspension ropes 146 and 148.

[0072] When the bottom 206 is in any desired position, the springs 112, 114, 152, and 154 of the spring drive system 100A can offset the weight of the bottom 206, allowing the bottom 206 to remain stationary. Because the spring drive system 100A uses the combined elastic force of the four springs 112, 114, 152, and 154, it can be used for larger curtains.

[0073] Cooperate Figure 9-11 , Figure 14 and Figure 15 A three-dimensional view and an exploded view of a curtain 200B equipped with a spring drive system 100A according to another embodiment of the present invention are respectively shown. Figure 9-11, 14, 15, the window covering 200B may include a top rail 202, a bottom rail 206, a middle rail 220, and two shielding structures 224, 226. The middle rail 220 is disposed between the top rail 202 and the bottom rail 206 and is movable relative to the top rail 202 independently of the bottom rail 206. The middle rail 220 may be fixedly connected to a handle 220A to facilitate user operation of the middle rail 220.

[0074] See Figure 14 、 15 Shielding structures 224 and 226 may be, for example, honeycomb structures. Shielding structure 224 is disposed between center rail 220 and base 206, with opposing ends 224A and 224B of shielding structure 224 positioned adjacent to center rail 220 and base 206, respectively. For example, first end 224A of shielding structure 224 may be provided with a fixing plate 228, which may be inserted into center rail 220, thereby securing first end 224A of shielding structure 224 to center rail 220. Second end 224B of shielding structure 224 may be secured to base 206 in a similar manner via fixing plate 212.

[0075] The shielding structure 226 is disposed between the top rail 202 and the middle rail 220, with opposite ends 226A and 226B of the shielding structure 226 being disposed adjacent to the top rail 202 and the middle rail 220, respectively. For example, the first end 226A of the shielding structure 226 may be provided with a fixing piece 208, which may be inserted into the top rail 202 to securely couple the first end 226A of the shielding structure 226 to the top rail 202. The second end 226B of the shielding structure 226 may be similarly secured to the middle rail 220 via a fixing piece 230. The opposite side ends of the middle rail 220 may be enclosed by side covers 232A and 232B, respectively, to facilitate confinement of the fixing pieces 228 and 230 within the middle rail 220.

[0076] See Figure 14 、 15 , the housing 102 of the spring drive system 100A can be fixedly coupled to the top rail 202 of the window covering 200B, the suspension cords 106 and 108 can be coupled to the bottom rail 206, and the suspension cords 146 and 148 can be coupled to the middle rail 220. More specifically, the end 106B of the suspension cord 106 and the end 108B of the suspension cord 108 can be fixedly coupled to the bottom rail 206, respectively, while the end 146B of the suspension cord 146 and the end 148B of the suspension cord 148 can be fixedly coupled to the middle rail 220, respectively.

[0077] See Figure 9-11, 14, and 15, the springs 112 and 114 of the spring drive system 100A can counteract the weight of the bottom 206 of the window covering 200B, so that the bottom 206 can remain stationary at any position relative to the top rail 202. The springs 152 and 154 of the spring drive system 100A can counteract the weight of the middle rail 220 of the window covering 200B, so that the middle rail 220 can remain stationary at any position relative to the top rail 202. In addition, the springs 112 and 114 and the rope drum 104 of the assembly 142A can operate independently of the springs 152 and 154 and the rope drum 144 of the assembly 142B.

[0078] When the middle rail 220 of window covering 200B remains stationary and the bottom 206 moves relative to the top rail 202 and middle rail 220, only the components of assembly 142A move, while the components of assembly 142B remain stationary. For example, when the bottom 206 moves downward relative to the top rail 202 and middle rail 220 to extend the shade structure 224, the suspension cords 106 and 108 can be unwound from the cord drum 104, which in turn can rotate synchronously with the gears 110A, 110B, 110C and the receiving shafts 120 and 122. This allows the two springs 112 and 114 to be unwound from the two spring shafts 116 and 118 and wound around the two receiving shafts 120 and 122, respectively. When the bottom portion 206 is in the overlapping shielding structure 224 and moves toward the middle rail 220, the two springs 112 and 114 can be respectively unwound from the two receiving shafts 120 and 122 and wound around the two spring shafts 116 and 118, thereby generating a force to cause the rope drum 104 to rotate in the direction of retracting the two suspension ropes 106 and 108. At the same time, because the middle rail 220 does not move and maintains its position, the rope drum 144, gears 150A, 150B, 150C, and the two springs 152 and 154 can all remain stationary. Figure 16 The spring drive system 100A is shown when the bottom portion 206 of the window covering 200B is in the lowered position and the middle rail 220 is in an initial position close to the top rail 202 .

[0079] When the bottom rail 206 of the window covering 200B remains stationary and the middle rail 220 moves relative to the top rail 202 and bottom rail 206, only the components of assembly 142B move, while the components of assembly 142A remain stationary. For example, when the middle rail 220 moves downward relative to the top rail 202 to extend the shade structure 226, the suspension cords 146 and 148 can be unwound from the cord drum 144, which can then rotate synchronously with the gears 150A, 150B, 150C and the receiving shafts 160 and 162. This allows the two springs 152 and 154 to be unwound from the two spring shafts 156 and 158 and wound around the two receiving shafts 160 and 162, respectively. When the middle rail 220 is moved toward the top rail 202 with the overlapping shielding structure 226, the two springs 152 and 154 can be respectively unwound from the two receiving shafts 160 and 162 and wound around the two spring shafts 156 and 158, thereby generating a force to cause the rope drum 144 to rotate in the direction of retracting the two suspension ropes 146 and 148. At the same time, because the bottom 206 does not move and maintains its position, the rope drum 104, the gears 110A, 110B, 110C, and the two springs 112 and 114 can all remain stationary. Figure 17 The spring drive system 100A is shown in a state corresponding to when the middle rail 220 of the window covering 200B moves from its initial position to the lowered position.

[0080] Although the curtain 200B described above has two shielding structures 224 and 226, other embodiments may also be provided with only one of the two shielding structures 224 and 226. For example, Figure 18 A perspective view of a curtain 200B′ provided by another embodiment of the present invention is shown, which is similar to the curtain 200B described above, but the shielding structure 226 between the top rail 202 and the middle rail 220 is omitted. Figure 18 The middle rail 220 of the curtain 200B′ can move downward relative to the top rail 202 to form a gap 240 between the top rail 202 and the middle rail 220 for light to pass through. In addition, the middle rail 220 of the curtain 200B′ can move upward to a position adjacent to the top rail 202 to close the gap 240 between the top rail 202 and the middle rail 220. Figure 18 The window covering 200B' shown may be provided with the aforementioned spring drive system 100A and operate in the same manner.

[0081] Figure 19 and Figure 20 1 and 2 are respectively an exploded view and a plan view of a spring drive system 100B for curtains according to another embodiment of the present invention. Figure 19 、 20The spring drive system 100B is substantially the same as the aforementioned spring drive system 100A and includes two assemblies 142A and 142B supported by the housing 102. The assembly 142A includes a rope drum 104, two suspension ropes 106 and 108, three gears 110A, 110B and 110C, two springs 112 and 114, two spring shafts 116 and 118, and two receiving shafts 120 and 122. The assembly 142B includes a rope drum 144, two suspension ropes 146 and 148, three gears 150A, 150B and 150C, two springs 152 and 154, two spring shafts 156 and 158, and two receiving shafts 160 and 162.

[0082] In spring drive system 100B, two suspension cables 106 and 108 coupled to cable drum 104 extend from end 102A of housing 102, while two suspension cables 146 and 148 coupled to cable drum 144 extend from end 102B of housing 102, with gears 110B and 150B meshing with each other. This allows the two components 142A and 142B of spring drive system 100B to operate in tandem. For example, cable drums 104 and 144 can rotate synchronously to simultaneously unwind suspension cables 106, 108, 146, and 148, thereby causing two springs 112 and 114 to unwind from two spring shafts 116 and 118, respectively, and wind around two receiving shafts 120 and 122. Furthermore, two springs 152 and 154 to unwind from two spring shafts 156 and 158, respectively, and wind around two receiving shafts 160 and 162, respectively. In addition, the springs 112 , 114 , 152 , 154 can be respectively unwound from the receiving shafts 120 , 122 , 160 , 162 and wound around the spring shafts 116 , 118 , 156 , 158 to cause the rope drums 104 , 144 to rotate in the direction of retracting the suspension ropes 106 , 108 , 146 , 148 .

[0083] Cooperate Figure 19 、 20 , Figure 21 FIG2 shows an exploded view of a curtain 200C equipped with a spring drive system 100B according to an embodiment of the present invention. Figure 19-21Window covering 200C has substantially the same structure as window covering 200 described above, including a top rail 202, a shielding structure 204, and a base 206. The housing 102 of the spring drive system 100B can be fixedly coupled to the top rail 202, while the ends 106B of the suspension cord 106, 108B of the suspension cord 108, 146B of the suspension cord 146, and 148B of the suspension cord 148 can all be fixedly coupled to the base 206. More specifically, the two suspension cords 106 and 108 extending from the end 102A of the housing 102 can be fixedly coupled to the base 206 on one of its left and right sides, while the two suspension cords 146 and 148 extending from the other end 102B of the housing 102 can be fixedly coupled to the base 206 on the other of its left and right sides. Of course, the present invention is not limited to this. According to other embodiments, the housing 102 of the spring drive system 100B can be fixedly connected to the bottom 206, and the end 106B of the suspension rope 106, the end 108B of the suspension rope 108, the end 146B of the suspension rope 146, and the end 148B of the suspension rope 148 can all be fixedly connected to the top rail 202.

[0084] As the bottom portion 206 of the window covering 200C moves up and down relative to the head rail 202, the two components 142A and 142B of the spring drive system 100B can be synchronized as described above. Furthermore, the springs 112, 114, 152, and 154 of the spring drive system 100B can offset the weight of the bottom portion 206, allowing the bottom portion 206 to remain stationary at any desired position.

[0085] The spring drive system of the present invention has a simple structure and a compact size, and can be easily expanded or modified to match the type or size of the curtain.

[0086] The above description is based on various embodiments of the present invention, wherein various features may be implemented singly or in various combinations. Therefore, the disclosure of the embodiments of the present invention is intended to illustrate specific examples of the principles of the present invention and should not be construed as limiting the present invention to the disclosed embodiments. Furthermore, the foregoing description and accompanying drawings are merely illustrative of the present invention and are not intended to limit the present invention. Other variations and combinations of elements are possible without departing from the spirit and scope of the present invention.

[0087] Description of Reference Numerals

[0088] 100, 100A, 100B spring drive system

[0089] 102 Shell 102A, 102B ends

[0090] 102C, 102D housing parts 104, 144 rope drum

[0091] 104A, 104B, 144A, 144B rope drum

[0092] 106, 108, 146, 148 Ends of suspension ropes 106A, 108A

[0093] 106B, 108B, 146B, 148B terminal

[0094] 110A~110C, 150A~150C gears

[0095] 112, 114, 152, 154 springs

[0096] 112A, 112B, 114A, 114B, 152A, 152B, 154A, 154B

[0097] 116, 118, 156, 158 spring shafts 120, 122, 160, 162 receiving shafts

[0098] 124, 126, 164, 166 Cover 130A-130C, 168A-168C Pivot axis

[0099] 132A, 132B, 132C shaft 128, 167, 217 screws

[0100] 134A, 134B shaft 142A, 142B assembly

[0101] 136, 138, 170, 172, 174, 176 guides

[0102] 200, 200B, 200B', 200C curtains

[0103] 202 top rail 204, 224, 226 shielding structure

[0104] 204A, 204B, 224A, 224B, 226A, 226B

[0105] 210A, 210B, 214A, 214B, 232A, 232B side covers

[0106] 206 bottom 208, 212, 228, 230 fixed plate

[0107] 216 weight piece 218 grommet

[0108] 220 middle rail 206A, 220A handle

[0109] 240 gap

Claims

1. A spring drive system for curtains, comprising: A housing having a first end and a second end opposite to each other; The first rope drum and the first gear are fixedly connected to each other and pivotally connected to the housing, and the first rope drum is connected to the first suspension rope and the second suspension rope respectively; a second gear pivotally connected to the housing; A first spring shaft and a second spring shaft are pivotally connected to opposite sides of the second gear, respectively, so that the first spring shaft and the second spring shaft can rotate relative to the second gear, and the second gear, the first spring shaft and the second spring shaft are coaxially arranged; a third gear pivotally connected to the housing and meshing with the first gear and the second gear respectively, wherein opposite sides of the third gear are fixedly connected to the first receiving shaft and the second receiving shaft respectively; a first spring and a second spring, wherein the first spring is assembled around the first spring axis, one end of the first spring is fixedly connected to the first receiving axis, and the other end of the first spring is adjacent to the first spring axis; and the second spring is assembled around the second spring axis, one end of the second spring is fixedly connected to the second receiving axis, and the other end of the second spring is adjacent to the second spring axis, wherein the arrangement of the first spring around the first spring axis allows the first spring axis to rotate asynchronously with the first spring, and the arrangement of the second spring around the second spring axis allows the second spring axis to rotate asynchronously with the second spring; The second rope drum and the fourth gear are fixedly connected to each other and pivotally connected to the housing, and the second rope drum is connected to the third suspension rope and the fourth suspension rope respectively; a fifth gear pivotally connected to the housing; a third spring shaft and a fourth spring shaft, each pivotally connected to opposite sides of the fifth gear, such that the third spring shaft and the fourth spring shaft are respectively rotatable relative to the fifth gear, and the fifth gear, the third spring shaft, and the fourth spring shaft are coaxially arranged; a sixth gear pivotally connected to the housing and meshing with the fourth gear and the fifth gear respectively, wherein opposite sides of the sixth gear are fixedly connected to the third receiving shaft and the fourth receiving shaft respectively; and a third spring and a fourth spring, wherein the third spring is assembled around the third spring axis and one end of the third spring is fixedly connected to the third receiving axis, and the fourth spring is assembled around the fourth spring axis and one end of the fourth spring is fixedly connected to the fourth receiving axis; The second suspension rope and the third suspension rope extend out of the first end portion of the shell, and the first suspension rope and the fourth suspension rope extend out of the second end portion of the shell.

2. The spring drive system of claim 1, wherein: The first rope drum, the third gear, the second gear, the fifth gear, the sixth gear and the fourth gear are sequentially arranged in the housing along a direction from the first end to the second end.

3. The spring drive system of claim 1, wherein: The second gear and the fifth gear are arranged close to each other in the housing.

4. The spring drive system of claim 1, wherein: A plurality of guide members are further provided in the housing to facilitate guiding the first suspension rope, the second suspension rope, the third suspension rope and the fourth suspension rope in the housing.

5. The spring drive system of claim 1, wherein: The first suspension rope and the third suspension rope extend adjacent to and parallel to two opposite side edges of the housing between the first end and the second end.

6. The spring drive system of claim 1, wherein: The first suspension cord and the second suspension cord are suitable for coupling to the bottom of the curtain, and the third suspension cord and the fourth suspension cord are suitable for coupling to the middle rail of the curtain.

7. The spring drive system of claim 1, wherein: The shell includes a first shell portion and a second shell portion, the first shell portion can be fixedly connected to the second shell portion, the first shell portion is equipped with the first rope drum, the first gear, the second gear, the third gear, the first spring shaft, the second spring shaft, the first receiving shaft, the second receiving shaft, the first spring and the second spring, and the second shell portion is equipped with the second rope drum, the fourth gear, the fifth gear, the sixth gear, the third spring shaft, the fourth spring shaft, the third receiving shaft, the fourth receiving shaft, the third spring and the fourth spring.

8. The spring drive system of claim 1, wherein: The pivot axes of the first to sixth gears are all distributed along the same straight line.

9. A curtain comprising: a top rail, a bottom rail, and a middle rail, wherein the middle rail is located between the top rail and the bottom rail; a shielding structure having a first end and a second end, the first end and the second end being disposed adjacent to the middle rail and the bottom, respectively; and The spring drive system according to any one of claims 1 to 8, wherein the shell of the spring drive system is fixedly connected to the top rail, the ends of the first suspension rope and the second suspension rope are respectively fixedly connected to the bottom, and the ends of the third suspension rope and the fourth suspension rope are respectively fixedly connected to the middle rail.

10. A spring drive system for a curtain, comprising: A housing having a first end and a second end opposite to each other; The first rope drum and the first gear are fixedly connected to each other and pivotally connected to the housing, and the first rope drum is connected to the first suspension rope and the second suspension rope respectively; a second gear pivotally connected to the housing; A first spring shaft and a second spring shaft are pivotally connected to opposite sides of the second gear, respectively, so that the first spring shaft and the second spring shaft can rotate relative to the second gear, and the second gear, the first spring shaft and the second spring shaft are coaxially arranged; a third gear pivotally connected to the housing and meshing with the first gear and the second gear respectively, wherein opposite sides of the third gear are fixedly connected to the first receiving shaft and the second receiving shaft respectively; a first spring and a second spring, wherein the first spring is assembled around the first spring axis, one end of the first spring is fixedly connected to the first receiving axis, and the other end of the first spring is adjacent to the first spring axis; and the second spring is assembled around the second spring axis, one end of the second spring is fixedly connected to the second receiving axis, and the other end of the second spring is adjacent to the second spring axis, wherein the arrangement of the first spring around the first spring axis allows the first spring axis to rotate asynchronously with the first spring, and the arrangement of the second spring around the second spring axis allows the second spring axis to rotate asynchronously with the second spring; The second rope drum and the fourth gear are fixedly connected to each other and pivotally connected to the housing, and the second rope drum is connected to the third suspension rope and the fourth suspension rope respectively; a fifth gear pivotally connected to the housing; a third spring shaft and a fourth spring shaft, each pivotally connected to opposite sides of the fifth gear, such that the third spring shaft and the fourth spring shaft are respectively rotatable relative to the fifth gear, and the fifth gear, the third spring shaft, and the fourth spring shaft are coaxially arranged; a sixth gear pivotally connected to the housing and meshing with the fourth gear and the fifth gear respectively, wherein opposite sides of the sixth gear are fixedly connected to the third receiving shaft and the fourth receiving shaft respectively; and a third spring and a fourth spring, wherein the third spring is assembled around the third spring axis and one end of the third spring is fixedly connected to the third receiving axis, and the fourth spring is assembled around the fourth spring axis and one end of the fourth spring is fixedly connected to the fourth receiving axis; The first rope drum, the third gear, the second gear, the fifth gear, the sixth gear and the fourth gear are sequentially arranged in the housing along the direction from the first end to the second end, and the second gear is meshed with the fifth gear.

11. The spring drive system of claim 10, wherein: The first suspension rope and the second suspension rope extend from the first end portion of the housing, and the third suspension rope and the fourth suspension rope extend from the second end portion of the housing.

12. The spring drive system of claim 10, wherein: The first suspension cord, the second suspension cord, the third suspension cord and the fourth suspension cord are suitable for coupling to the bottom of the curtain.

13. The spring drive system of claim 10, wherein: The shell includes a first shell portion and a second shell portion, the first shell portion can be fixedly connected to the second shell portion, the first shell portion is equipped with the first rope drum, the first gear, the second gear, the third gear, the first spring shaft, the second spring shaft, the first receiving shaft, the second receiving shaft, the first spring and the second spring, and the second shell portion is equipped with the second rope drum, the fourth gear, the fifth gear, the sixth gear, the third spring shaft, the fourth spring shaft, the third receiving shaft, the fourth receiving shaft, the third spring and the fourth spring.

14. The spring drive system of claim 10, wherein: The pivot axes of the first to sixth gears are all distributed along the same straight line.

15. A curtain comprising: top rail and bottom rail; a shielding structure having a first end and a second end, the first end and the second end being disposed adjacent to the top rail and the bottom portion, respectively; as well as The spring drive system according to any one of claims 10 to 14, wherein the housing of the spring drive system is fixedly connected to one of the top rail and the bottom, and ends of the first suspension rope, the second suspension rope, the third suspension rope, and the fourth suspension rope are fixedly connected to the other of the top rail and the bottom.

16. A spring drive system for a curtain, comprising: A housing portion having a first end and a second end opposite to each other; The rope drum and the first gear are fixedly connected to each other and pivotally connected to the housing portion, and the rope drum is connected to the first suspension rope and the second suspension rope respectively; a second gear pivotally connected to the housing portion; A first spring shaft and a second spring shaft are pivotally connected to opposite sides of the second gear, respectively, so that the first spring shaft and the second spring shaft can rotate relative to the second gear, and the second gear, the first spring shaft and the second spring shaft are coaxially arranged; a third gear pivotally connected to the housing portion and meshing with the first gear and the second gear respectively, wherein opposite sides of the third gear are fixedly connected to the first receiving shaft and the second receiving shaft respectively; and a first spring and a second spring, wherein the first spring is assembled around the first spring axis, one end of the first spring is fixedly connected to the first receiving axis, and the other end of the first spring is adjacent to the first spring axis; and the second spring is assembled around the second spring axis, one end of the second spring is fixedly connected to the second receiving axis, and the other end of the second spring is adjacent to the second spring axis, wherein the arrangement of the first spring around the first spring axis allows the first spring axis to rotate asynchronously with the first spring, and the arrangement of the second spring around the second spring axis allows the second spring axis to rotate asynchronously with the second spring; The first rope drum, the third gear and the second gear are arranged in sequence in the shell part along the direction from the first end to the second end. The shell part is also provided with a plurality of guide members to guide the first suspension rope and the second suspension rope in the shell. The second suspension rope extends from the first end of the shell part, and the first suspension rope can selectively extend from one of the first end and the second end of the shell part.

17. The spring drive system of claim 16, wherein: The housing portion, the rope drum, the first suspension rope, the second suspension rope, the first spring shaft, the second spring shaft, the first receiving shaft, the second receiving shaft, the first spring, the second spring and the first to third gears constitute an expandable component, which can be selectively used alone or in adjacent connection with another component of the same structure.

18. The spring drive system of claim 17, wherein: The second end portion of the housing portion of the component may be fixedly connected to the second end portion of the housing portion of the other component.

19. The spring drive system of claim 17, wherein: When the component is adjacently engaged with the other component for use, the first suspension cord can be guided through the interior of the housing portion of the other component.

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