Roman blinds

Abstract

An embodiment of the present invention provides a Roman blind comprising an upper beam, a first retractable cord device assembled on the upper beam, a curtain fabric suspended below the upper beam and provided with a plurality of positioning members along its height, a bottom beam fixed to the bottom end of the curtain fabric, and a first load-bearing cord having its top end fixed to the first retractable cord device and its bottom end, after sequentially passing through corresponding positioning members on the curtain fabric, fixed to the bottom beam. The first retractable cord device drives the bottom beam up and down by retracting and releasing the first load-bearing cord, thereby folding or unfolding the curtain fabric accordingly. The Roman blind also comprises a middle beam fixed to the top end of the curtain fabric, a second retractable cord device assembled on the upper beam, and a second load-bearing cord having its bottom end fixed to the middle beam and its top end connected to the second retractable cord device. The second retractable cord device drives the middle beam up and down by retracting and releasing the second load-bearing cord, thereby folding or unfolding the curtain fabric accordingly. This embodiment enables bidirectional folding and unfolding of the curtain fabric.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of curtains, and in particular to a Roman blind. Background Art

[0002] An existing Roman blind typically includes an upper beam, a retractable cord device assembled on the upper beam, a curtain fabric suspended below the upper beam and provided with a plurality of positioning members along the height direction, a bottom beam fixed to the bottom end of the curtain fabric, and a load-bearing cord having a top end fixed to the retractable cord device and a bottom end fixed to the bottom beam after sequentially passing through corresponding positioning members on the curtain fabric. The retractable cord device drives the bottom beam up and down by retracting and releasing the first load-bearing cord, thereby causing the curtain fabric to be folded or unfolded accordingly. In actual use, the folding and unfolding of the curtain fabric of a traditional Roman blind is unidirectional, that is, it can usually only be folded from the bottom end along the positions of the various positioning members toward the top end, and unfolded from the top end along the positions of the various positioning members toward the bottom end. This provides a single way of covering the window. When a user needs to cover the bottom area of ​​the window but not the top area of ​​the window, or when a user only needs to cover the middle area of ​​the window but not the top and bottom areas of the window, this Roman blind cannot achieve this. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a Roman blind that can realize bidirectional folding and unfolding of the blind fabric.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides the following technical solutions: a Roman blind, comprising an upper beam, a first retractable rope device assembled on the upper beam, a curtain suspended below the upper beam and provided with a plurality of positioning members along the height direction, a bottom beam fixed to the bottom end of the curtain, and a first load-bearing rope having a top end fixed to the first retractable rope device and a bottom end fixed to the bottom beam after passing through the corresponding positioning members on the curtain in sequence. The first retractable rope device drives the bottom beam to rise and fall by retracting and releasing the first load-bearing rope, so that the curtain is folded or unfolded accordingly. The Roman blind also includes a middle beam fixed to the top end of the curtain, a second retractable rope device assembled on the upper beam, and a second load-bearing rope whose bottom end is fixed to the middle beam and whose top end is connected to the second retractable rope device. The second retractable rope device drives the middle beam to rise and fall by retracting and releasing the second load-bearing rope, so that the curtain is unfolded or folded accordingly.

[0005] Furthermore, the center beam is provided with a through hole, and the first load-bearing rope passes through the center beam via the through hole.

[0006] Furthermore, a fixing mechanism for fixing the second load-bearing rope and allowing the first load-bearing rope to pass through is assembled in the through-hole, and the fixing mechanism includes a mounting pipe fixed in the through-hole and provided with a through-hole in the middle axially, and a positioning plug ring provided with a core hole in the middle and tightly plugged in the opening of one end of the through-hole. The first load-bearing rope passes through the center beam via the through-hole and the core hole, and the bottom end of the second load-bearing rope is clamped and positioned by the outer wall of the positioning plug ring and the hole wall of the through-hole.

[0007] Furthermore, the positioning plug ring is inserted into the bottom end of the through hole from bottom to top. The positioning plug ring is a truncated cone or a prism with a thin top and a thick bottom. The bottom end of the second load-bearing rope is wound on the positioning plug ring in a manner that corresponds to passing through the core hole. The second load-bearing rope is attached to the outer wall of the positioning plug ring and is clamped and positioned accordingly by the outer wall of the positioning plug ring and the wall of the through hole.

[0008] Furthermore, the mounting pipe fitting includes an inner tube having a first axial hole axially provided in the middle and a first limiting plate at one end, and an outer tube having a second axial hole axially provided in the middle and a second limiting plate at one end. The inner tube and the outer tube are respectively inserted into the through-hole from the upper and lower ends of the through-hole, and the first limiting plate and the second limiting plate are respectively attached to the upper and lower surfaces of the center beam. The inner tube is also correspondingly inserted into the outer tube and the outer wall of the inner tube is provided with a plurality of convex ring bodies for increasing the friction between the inner wall of the outer tube. The through hole is composed of the first axial hole and the second axial hole.

[0009] Furthermore, the bottom end portion of the second shaft hole is also formed into a truncated cone hole or a prism hole that is thin at the top and thick at the bottom and is compatible with the positioning plug ring.

[0010] Furthermore, a rope clamping groove is provided on the inner wall of the core hole, and the portion of the second load-bearing rope located in the core hole is correspondingly clamped into the rope clamping groove.

[0011] Furthermore, the first rope retracting device and the second rope retracting device have the same structure, both including a power mechanism fixed to the upper beam, a transmission rod driven to rotate by the power mechanism, a rope drum sleeved on the transmission rod and fixed relative to the transmission rod in the circumferential direction, a nut fixed to the upper beam and threadedly engaged with the rope drum, and a rope guide seat fixed on the upper beam for guiding the first load-bearing rope or the second load-bearing rope to be wound onto the corresponding rope drum, and the top ends of the first load-bearing rope and the second load-bearing rope are respectively wound on the rope drums of the first rope retracting device and the second rope retracting device.

[0012] Furthermore, the power mechanism includes a shell assembled in the middle section of the transmission rod, a spring shaft and an output shaft pivotally arranged in parallel in the shell, and a flat spiral spring wound on the spring shaft and fixed at the outer end to the output shaft. Each transmission rod is circumferentially fixed to the output shaft of one of the power mechanisms and coaxially passes through the spring shaft of the other power mechanism. The first rope-retracting device and the second rope-retracting device each include two rope winding drums respectively assembled at the opposite ends of the transmission rod, the first load-bearing rope, the second load-bearing rope, the nut and the rope guide seat are all arranged in one-to-one correspondence with the rope winding drum, and the first rope-retracting device and the second rope-retracting device are both integrally formed with the two rope guide seats located at the same end of the two transmission rods.

[0013] Furthermore, the Roman blind further includes a load-bearing rope adjusting device assembled between the bottom end of the first load-bearing rope and the middle beam for adjusting the length of the first load-bearing rope, and the load-bearing rope adjusting device includes:

[0014] A sleeve fixed to the bottom beam and axially perpendicular to the curtain, with one end open and the other end closed, the sleeve having a wall provided with a wire groove extending along the axial direction of the sleeve and communicating with the inner hole of the sleeve, and an end plate at the closed end of the sleeve also provided with a plurality of first positioning portions evenly distributed circumferentially around the central axis of the sleeve;

[0015] A rope winding shaft is inserted from the open end of the sleeve and pivotally mounted in the sleeve, the bottom end of the first carrying rope passes through the wire groove and is wound around the rope winding shaft, one end of the rope winding shaft located outside the sleeve is further formed with a rotating handle for operating and rotating the rope winding shaft, and the inner end surface of the rope winding shaft is further provided with a second positioning portion that cooperates with the first positioning portion to prevent the rope winding shaft from rotating; and

[0016] An adjustable locking assembly for keeping the second positioning portion of the rope winding shaft in a mating state with the first positioning portion, the adjustable locking assembly including a thumb screw passing through a corresponding locking hole provided on the rope winding shaft and screwed into a corresponding screw hole provided in the middle of the end plate of the sleeve, and an elastic member provided between the head of the thumb screw and the rope winding shaft for elastically pushing the rope winding shaft so that the second positioning portion and the first positioning portion remain mating.

[0017] After adopting the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: on the basis of traditional curtains, the embodiment of the present invention adds a middle beam at the top of the curtain, adds a second retracting and releasing rope device to the upper beam, and connects the middle beam and the second retracting and releasing rope device through a second load-bearing rope, so as to realize two-way folding and unfolding of the curtain. In specific use, not only can the first retracting and releasing rope device retract and release the first load-bearing rope to drive the bottom beam to rise and fall so that the curtain is correspondingly folded from bottom to top or unfolded from top to bottom, but the second retracting and releasing rope device can also retract and release the second load-bearing rope to drive the middle beam to rise and fall so that the curtain is correspondingly unfolded from top to bottom or folded from bottom to top. The first retracting and releasing rope device and the second retracting and releasing rope device can work separately or cooperate with each other, so as to respectively realize various shielding effects such as shielding the top area of ​​the window but not shielding the bottom area, shielding the bottom area of ​​the window but not shielding the top area, and not shielding both the bottom area and the top area of ​​the window and only shielding the middle area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the disassembled structure of an optional embodiment of the Roman blind of the present invention.

[0019] Figure 2 This is a schematic diagram of the effect of the curtain covering the window body in an optional embodiment of the Roman blind of the present invention.

[0020] Figure 3 This is a schematic diagram of the effect of the curtain covering the window body in another optional embodiment of the Roman blind of the present invention.

[0021] Figure 4 This is a schematic diagram of the effect of the curtain covering the window in another optional embodiment of the Roman blind of the present invention.

[0022] Figure 5 This is a schematic diagram of the disassembled structure of the fixing mechanism of an optional embodiment of the Roman blind of the present invention.

[0023] Figure 6 This is a schematic cross-sectional view of a fixing mechanism of an optional embodiment of a Roman blind of the present invention.

[0024] Figure 7 This is an optional embodiment of the Roman blind of the present invention Figure 1 Enlarged schematic diagram of point A in the middle.

[0025] Figure 8 This is a schematic diagram of the disassembled structure of the power mechanism of an optional embodiment of the Roman blind of the present invention.

[0026] Figure 9 This is a schematic cross-sectional view of the power mechanism of an optional embodiment of the Roman blind of the present invention.

[0027] Figure 10This is a schematic diagram of the disassembled structure of a load-bearing cord adjustment device of an optional embodiment of a Roman blind of the present invention.

[0028] Figure 11 This is a schematic diagram of the disassembled structure of the load-bearing rope adjustment device of an optional embodiment of the Roman blind of the present invention from another perspective.

[0029] Figure 12 This is a schematic cross-sectional view of a load-bearing cord adjustment device of an optional embodiment of a Roman blind of the present invention. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0031] like Figures 1-4 As shown, an optional embodiment of the present invention provides a Roman blind, comprising an upper beam 1, a first retractable rope device 2 assembled on the upper beam, a curtain 3 suspended below the upper beam 1 and provided with a plurality of positioning members along the height direction, a bottom beam 4 fixed to the bottom end of the curtain 3, and a first load-bearing rope 5 whose top end is fixed to the first retractable rope device 2 and whose bottom end passes through the corresponding positioning members 30 on the curtain 3 in sequence and is then fixed to the bottom beam 4. The first retractable rope device 2 drives the bottom beam 4 to rise and fall by retracting and releasing the first load-bearing rope 5, so that the curtain 3 is folded or unfolded accordingly. The Roman blind also includes a middle beam 6 fixed to the top end of the curtain 3, a second retractable rope device 7 assembled on the upper beam 1, and a second load-bearing rope 8 whose bottom end is fixed to the middle beam 6 and whose top end is connected to the second retractable rope device 7. The second retractable rope device 7 drives the middle beam 6 to rise and fall by retracting and releasing the second load-bearing rope 8, so that the curtain 3 is unfolded or unfolded accordingly.

[0032] The embodiment of the present invention is based on the traditional curtain, by adding a middle beam 6 to the top of the curtain 3, adding a second retracting rope device 7 to the upper beam 1, and connecting the middle beam 6 and the second retracting rope device 7 through the second load-bearing rope 8, so that the curtain 3 can be folded and unfolded in two directions. When used specifically, not only can the first retracting rope device 2 retract and release the first load-bearing rope 5 to drive the bottom beam 4 to rise and fall so that the curtain 3 can be correspondingly folded from bottom to top or unfolded from top to bottom, but the second retracting rope device 7 can also retract and release the second load-bearing rope 8 to drive the middle beam 6 to rise and fall so that the curtain 3 can be correspondingly unfolded from top to bottom or folded from bottom to top. The first retracting rope device 2 and the second retracting rope device 7 can work separately or cooperate with each other, so that the top area of ​​the window can be shielded while the bottom area cannot be shielded (such as Figure 2 As shown), the bottom area of ​​the window is blocked but the top area is not blocked (as shown Figure 3As shown) and the bottom and top areas of the window are not masked, only the middle area is masked (as shown Figure 4 as shown) and other masking effects.

[0033] In another optional embodiment of the present invention, Figure 1 、 Figure 5 and Figure 6 As shown, the center beam 6 is provided with a through-hole 6a, through which the first carrying rope 5 passes through the center beam 6. In this embodiment, by providing the through-hole 6a, the first carrying rope 5 is passed through the center beam 6 through the through-hole 6a. The through-hole 6a can achieve the positioning of the first carrying rope 5 and prevent the first carrying rope 5 from swinging randomly.

[0034] In another optional embodiment of the present invention, Figure 1 、 Figure 5 and Figure 6 As shown, a fixing mechanism 6b for securing the second load-bearing rope 8 and allowing the first load-bearing rope 5 to pass through is assembled within the through-hole 6a. The fixing mechanism 6b includes a mounting tube 60 fixed within the through-hole 6a and having an axially defined through-hole 60a in the middle thereof, and a positioning ring 62 having a core hole 62a in the middle thereof and tightly plugged into one end of the through-hole 60a. The first load-bearing rope 5 passes through the center beam 6 via the through-hole 60a and the core hole 62a, while the bottom end of the second load-bearing rope 8 is clamped and positioned by the outer wall of the positioning ring 62 and the wall of the through-hole 60a. In this embodiment, when the positioning ring 62 is tightly plugged into one end of the through-hole 60a, the outer wall of the positioning ring 62 and the wall of the through-hole 60a can clamp and position the second load-bearing rope 8, and the first load-bearing rope 5 passes through the center beam 6 via the through-hole 60a and the core hole 62a, making assembly and disassembly very convenient.

[0035] In another optional embodiment of the present invention, Figure 1 、 Figure 5 and Figure 6 As shown, the positioning ring 62 is inserted from bottom to top into the bottom end of the through hole 60a. The positioning ring 62 is a truncated cone or prism with a narrow top and a wide bottom. The bottom end of the second support rope 8 is wound around the positioning ring 62 in a manner corresponding to passing through the core hole 62a. The section of the second support rope 8 that abuts the outer wall of the positioning ring 62 is clamped and positioned by the outer wall of the positioning ring 62 and the wall of the through hole 60a. In this embodiment, the positioning ring 62 is a truncated cone or prism with a narrow top and a wide bottom. The bottom end of the second support rope 8 is wound around the positioning ring 62 in a manner corresponding to passing through the core hole 62a. As the positioning ring 62 is inserted from bottom to top into the bottom end of the through hole 60a, the distance between the outer wall of the positioning ring 62 and the wall of the through hole 60a gradually decreases, gradually clamping the second support rope 8, achieving stable positioning.

[0036] In another optional embodiment of the present invention, Figure 1 、 Figure 5 and Figure 6 As shown, the mounting pipe 60 includes an inner tube 601 having a first axial hole 601a axially provided in the middle and a first limiting plate 601b at one end, and an outer tube 603 having a second axial hole 603a axially provided in the middle and a second limiting plate 603b at one end. The inner tube 601 and the outer tube 603 are respectively inserted into the through-hole 6a from the upper and lower ends of the through-hole 6a, the first limiting plate 601b and the second limiting plate 603b are respectively adhered to the upper and lower surfaces of the center beam 6, the inner tube 601 is also correspondingly inserted into the outer tube 603, and the outer wall of the inner tube 601 is provided with a plurality of convex ring bodies 601c for increasing the friction between the inner wall of the outer tube 603, and the through-hole 60a is composed of the first axial hole 601a and the second axial hole 603a. In this embodiment, the inner tube 601 and the outer tube 603 are connected by the convex ring body 601c on the inner tube 601 to form the installation pipe fitting 60. The convex ring body 601c can effectively increase the friction between the inner tube 601 and the outer tube 603, making the connection between the inner tube 601 and the outer tube 603 more stable. In addition, a first limiting plate 601b and a second limiting plate 603b are provided to abut and limit the corresponding outer walls of the central beam 6, which can effectively position the inner tube 601 and the outer tube 603 in the through hole 6a.

[0037] In another optional embodiment of the present invention, Figure 1 、 Figure 5 and Figure 6 As shown, the bottom end of the second axial hole 603a is further formed into a truncated cone or prism hole 603c that is tapered at the top and thickened at the bottom and that is compatible with the positioning ring 62. In this embodiment, the provision of the truncated cone or prism hole 603c effectively cooperates with the positioning ring 62 to secure the second support rope 8, preventing the second support rope 8 from being loosened due to excessive stress.

[0038] In another optional embodiment of the present invention, Figure 5 As shown, the inner wall of the core hole 62a is provided with a rope clamping groove 621, and the portion of the second carrying rope 8 located within the core hole 62a is correspondingly clamped into the rope clamping groove 621. In this embodiment, the rope clamping groove 621 is further provided to clamp the portion of the second carrying rope 8 located within the core hole 62a into the rope clamping groove 621, further positioning the second carrying rope 8 and ensuring that the second carrying rope 8 is stably fixed by the positioning plug ring 62.

[0039] In specific implementation, Figure 7As shown, the positioning member 30 includes a fixing ring 301 fixed to the curtain 3 and a positioning ring 303 movably mounted on the fixing ring 301. The first carrying rope 5 passes through the center hole 303a of the positioning ring 303. In this embodiment, the positioning member 30 uses the fixing ring 301 and the positioning ring 303. On the one hand, it can effectively limit the folding position of the curtain 3; on the other hand, the positioning ring 303 can flexibly swing to adapt to the movement of the second carrying rope 5. In addition, as shown in FIG. Figure 1 As shown, the bottom beam 4 is further provided with a first operating member 40 for operating the bottom beam 4; the center beam 6 is further provided with a second operating member 64 for operating the center beam 6. In this embodiment, the provision of the first operating member 30 and the second operating member 64 facilitates the user's operation of the bottom beam 3 and the center beam 6 to fold and unfold the curtain 3.

[0040] In another optional embodiment of the present invention, Figure 1 As shown, the first rope-retracting device 2 and the second rope-retracting device 7 have the same structure, both including a power mechanism 20 fixed to the upper beam 1, a transmission rod 22 driven to rotate by the power mechanism 20, a rope drum 24 sleeved on the transmission rod 22 and fixed relatively to the transmission rod 22 in the circumferential direction, a nut 26 fixed to the upper beam 1 and screwed with the rope drum 22, and a rope guide seat 28 fixed on the upper beam 1 for guiding the first load-bearing rope 5 or the second load-bearing rope 8 to be wound onto the corresponding rope drum 22. The top ends of the first load-bearing rope 5 and the second load-bearing rope 8 are respectively wound on the rope drum 24 of the first rope-retracting device 2 and the second rope-retracting device 7. In this embodiment, the first rope-retracting device 2 and the second rope-retracting device 7 have the same structure, and the design cost is relatively lower; a power mechanism 20, a transmission rod 22, a rope drum 24, a nut 26 and a rope guide seat 28 are used accordingly, and the first load-bearing rope 5 and the second load-bearing rope 8 are wound onto the corresponding rope drum 24 through the guidance of the rope guide seat 28. During specific operation, the power mechanism 20 drives the rope drum 24 and the nut 26 to rotate relative to each other via the transmission rod 22, and the rope drum 24 realizes the corresponding folding and unfolding of the curtain 3 by the action of retracting and releasing the first load-bearing rope 5 or the second load-bearing rope 8.

[0041] In another optional embodiment of the present invention, Figure 1 、 Figure 8 and Figure 9As shown, the power mechanism 20 includes a shell 201 assembled in the middle section of the transmission rod 22, a spring shaft 203 and an output shaft 205 pivotally arranged in parallel in the shell 201, and a flat spiral spring 207 wound on the spring shaft 203 and fixed on the output shaft 205 at its outer end. Each transmission rod 22 is circumferentially fixed to the output shaft 205 of one of the power mechanisms 20 and coaxially passes through the spring shaft 203 of the other power mechanism 20. The first rope-retracting device 2 and the second rope-retracting device 7 each include two rope drums 24 assembled at opposite ends of the transmission rod 22, the first load-bearing rope 5, the second load-bearing rope 8, the nut 26 and the rope guide seat 28 are all arranged in one-to-one correspondence with the rope drum 24, and the first rope-retracting device 2 and the second rope-retracting device 7 are both integrally formed with the two rope guide seats 28 located at the same end of the two transmission rods 22. In this embodiment, the power mechanism 20 adopts the above-mentioned structural form, which is simple in structure and can effectively drive the rope drum 24 to retract and release the first load-bearing rope 5 and the second load-bearing rope 8; and each transmission rod 22 is relatively fixed to the output shaft 205 of one of the power mechanisms 20 in the circumferential direction and coaxially passes through the spring shaft 203 of the other power mechanism 20, which can effectively optimize the spatial layout and ensure the mutual coordination between the various structural parts, and a rope drum 24 is provided at each of the opposite ends of the transmission rod 22 to ensure that the curtain 3 is stably folded and unfolded; in addition, the first rope-retracting device 2 and the second rope-retracting device 7 are both located at the two rope guide seats 28 at the same end of the two transmission rods 22, which is integrally formed, and the design cost is lower and the assembly is convenient. Figure 8 and Figure 9 In the embodiment, each transmission rod 22 coaxially passes through the output shaft 205 and the spring shaft 203 of different power mechanisms 20; in addition, a lateral locking member 205a (for example, a screw) is passed through the output shaft 205 and then locked on the transmission rod 22 to achieve relative fixation of the transmission rod 22 and the output shaft 205 in the circumferential direction.

[0042] In another optional embodiment of the present invention, Figure 10-12 As shown, the Roman blind further includes a carrying rope adjusting device 9 assembled between the bottom end of the first carrying rope 5 and the middle beam 6 for adjusting the length of the first carrying rope 5. The carrying rope adjusting device 9 includes:

[0043] A sleeve 90 is fixed to the bottom beam 4 and axially perpendicular to the curtain 3, with one end open and the other end closed. The sleeve 90 has a wire groove 903 extending along the axial direction of the sleeve 90 and communicating with the inner hole 901 of the sleeve 90. The end plate of the closed end of the sleeve 90 is also provided with a plurality of first positioning portions 905 evenly distributed around the central axis of the sleeve 90.

[0044] A rope winding shaft 92 is inserted from the open end of the sleeve 90 and pivotally mounted in the sleeve 90. The bottom end of the first carrying rope 5 passes through the wire groove 903 and is wound around the rope winding shaft 92. A rotating handle 921 for operating and rotating the rope winding shaft 92 is formed at one end of the rope winding shaft 92 located outside the sleeve 90. A second positioning portion 923 is further provided on the inner end surface of the rope winding shaft 92 to cooperate with the first positioning portion 903 to prevent the rope winding shaft 92 from rotating.

[0045] An adjustable locking assembly 94 is used to keep the second positioning portion 923 of the rope winding shaft 92 in a mating state with the first positioning portion 903. The adjustable locking assembly 94 includes a thumb screw 941 that passes through a corresponding locking hole 925 on the rope winding shaft 92 and is screwed into a corresponding screw hole 907 in the middle of the end plate of the sleeve 90, and an elastic member 943 is provided between the head of the thumb screw 941 and the rope winding shaft 92 for elastically pushing the rope winding shaft 92 so that the second positioning portion 923 and the first positioning portion 903 remain mating.

[0046] The embodiment of the present invention is to insert the rope shaft 92 into the shaft hole 901 of the sleeve 90 and pivot it, then pass one end of the first load rope 5 through the wire groove 903 on the side wall of the shaft hole 901 and wind it around the rope shaft 92, and the rope shaft 92 is provided with a second positioning portion 923 that cooperates with the first positioning portion 905 of the sleeve 90 to prevent the rope shaft 92 from rotating, and a locking assembly 94 for limiting the axial displacement of the rope shaft 92; when it is necessary to adjust the length of the first load rope 5, the thumb screw 941 of the locking assembly 94 on the rope shaft 92 is loosened a proper distance in the direction away from the sleeve 90, and then force is applied to the rotating handle 921 to pull the rope shaft 92 outward, so that the rope shaft When the second positioning portion 923 on 92 is disengaged from the first positioning portion 905, the rope winding shaft 92 can be rotated to retract the first load-bearing rope 5 of a predetermined length until the first load-bearing rope 5 outside the load-bearing rope adjusting device 9 reaches the desired length, and then the second positioning portion 921 of the rope winding shaft 92 is re-inserted into the first positioning portion 905 of the sleeve 90, and finally the thumb screw 941 of the locking assembly 94 is tightened. Due to the elastic force of the elastic member 943, the second positioning portion 921 is always kept engaged with the first positioning portion 905, which can effectively limit the rope winding shaft 92 and prevent it from rotating again, so that the lower end of the first load-bearing rope 5 is effectively fixed and maintains the set length.

[0047] In such Figure 10-12 In the embodiment, the first positioning portion 905 is a positioning hole provided on the bottom wall of the shaft hole 901; the second positioning portion 921 is a positioning column provided on the end face of the insertion end of the rope winding shaft 92. Of course, it can be understood that the positions of the positioning hole and the positioning column can be interchanged; the elastic member 943 can be a coil spring.

[0048] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A Roman blind, comprising an upper beam, a first retractable cord device assembled on the upper beam, a curtain fabric suspended below the upper beam and provided with a plurality of positioning members along the height direction, a bottom beam fixed to the bottom end of the curtain fabric, and a first load-bearing cord having a top end fixed to the first retractable cord device and a bottom end sequentially passing through corresponding positioning members on the curtain fabric and then fixed to the bottom beam, wherein the first retractable cord device drives the bottom beam to rise and fall by retracting and releasing the first load-bearing cord, thereby folding or unfolding the curtain fabric accordingly, characterized in that: The Roman blind also includes a middle beam fixed to the top of the curtain, a second retractable rope device assembled on the upper beam, and a second load-bearing rope fixed to the middle beam at the bottom end and connected to the second retractable rope device at the top end, the second retractable rope device drives the middle beam to rise and fall by retracting and releasing the second load-bearing rope, so that the curtain is unfolded or folded accordingly; a through hole is provided on the middle beam, and the first load-bearing rope passes through the middle beam through the through hole; a fixing mechanism for fixing the second load-bearing rope and allowing the first load-bearing rope to pass through is assembled in the through hole, and the fixing mechanism includes a mounting pipe fixed in the through hole and having a through hole in the middle axially, and a positioning plug ring with a core hole in the middle and tightly plugged in the opening of one end of the through hole, the first load-bearing rope passes through the middle beam through the through hole and the core hole, and the bottom end of the second load-bearing rope is fixed by the The outer wall of the positioning plug ring is clamped and positioned with the hole wall of the through hole, and the central axes of the through hole, the through hole and the core hole are all parallel to the lifting direction of the center beam. The mounting tube comprises an inner tube with a first axial hole axially provided in the middle and a first limiting plate at one end, and an outer tube with a second axial hole axially provided in the middle and a second limiting plate at one end. The inner tube and the outer tube are respectively inserted into the through hole from the upper and lower ends of the through hole, and the side surfaces of the first limiting plate and the second limiting plate facing the center beam are respectively adapted to the shapes of the upper and lower surfaces of the center beam and respectively fit the upper and lower surfaces of the center beam, the inner tube is also correspondingly inserted into the outer tube, and the outer wall of the inner tube is provided with a plurality of convex ring bodies for increasing the friction between the inner wall of the outer tube, and the through hole is composed of the first axial hole and the second axial hole.

2. The Roman blind according to claim 1, wherein: The positioning plug ring is inserted into the bottom end of the through hole from bottom to top. The positioning plug ring is a truncated cone or a prism with a thin top and a thick bottom. The bottom end of the second load-bearing rope is wound on the positioning plug ring in a manner that corresponds to passing through the core hole. The second load-bearing rope is attached to the section of the outer wall of the positioning plug ring and is clamped and positioned accordingly by the outer wall of the positioning plug ring and the wall of the through hole.

3. The Roman blind according to claim 2, wherein: The bottom end portion of the second shaft hole is also formed into a truncated cone hole or a prism hole which is thin at the top and thick at the bottom and is adapted to the positioning plug ring.

4. The Roman blind according to claim 2, wherein: The inner wall of the core hole is provided with a rope clamping groove, and the portion of the second load-bearing rope located in the core hole is correspondingly clamped into the rope clamping groove.

5. The Roman shade according to claim 1, wherein: The first rope retracting device and the second rope retracting device have the same structure, both including a power mechanism fixed to the upper beam, a transmission rod driven to rotate by the power mechanism, a rope drum sleeved on the transmission rod and fixed relative to the transmission rod in the circumferential direction, a nut fixed to the upper beam and threadedly engaged with the rope drum, and a rope guide seat fixed on the upper beam for guiding the first load-bearing rope or the second load-bearing rope to be wound onto the corresponding rope drum, and the top ends of the first load-bearing rope and the second load-bearing rope are respectively wound on the rope drums of the first rope retracting device and the second rope retracting device.

6. The Roman blind according to claim 5, wherein: The power mechanism includes a shell assembled in the middle section of the transmission rod, a spring shaft and an output shaft pivotally arranged in parallel in the shell, and a flat spiral spring wound on the spring shaft and fixed on the output shaft at its outer end. Each transmission rod is circumferentially fixed to the output shaft of one of the power mechanisms and coaxially passes through the spring shaft of the other power mechanism. The first rope-retracting device and the second rope-retracting device each include two rope winding drums respectively assembled at the opposite ends of the transmission rod. The first load-bearing rope, the second load-bearing rope, the nut and the rope guide seat are all arranged in one-to-one correspondence with the rope winding drum. The first rope-retracting device and the second rope-retracting device are both integrally formed with the two rope guide seats located at the same end of the two transmission rods.

7. The Roman shade according to claim 1, wherein: The Roman blind further includes a load-bearing rope adjusting device assembled between the bottom end of the first load-bearing rope and the center beam for adjusting the length of the first load-bearing rope, the load-bearing rope adjusting device including: A sleeve fixed to the bottom beam and axially perpendicular to the curtain, with one end open and the other end closed, the sleeve having a wall provided with a wire groove extending along the axial direction of the sleeve and communicating with the inner hole of the sleeve, and an end plate at the closed end of the sleeve also provided with a plurality of first positioning portions evenly distributed circumferentially around the central axis of the sleeve; A rope winding shaft is inserted from the open end of the sleeve and pivotally mounted in the sleeve, the bottom end of the first carrying rope passes through the wire groove and is wound around the rope winding shaft, one end of the rope winding shaft located outside the sleeve is further formed with a rotating handle for operating and rotating the rope winding shaft, and the inner end surface of the rope winding shaft is further provided with a second positioning portion that cooperates with the first positioning portion to prevent the rope winding shaft from rotating; and An adjustable locking assembly for keeping the second positioning portion of the rope winding shaft in a mating state with the first positioning portion, the adjustable locking assembly including a thumb screw passing through a corresponding locking hole provided on the rope winding shaft and screwed into a corresponding screw hole provided in the middle of the end plate of the sleeve, and an elastic member provided between the head of the thumb screw and the rope winding shaft for elastically pushing the rope winding shaft so that the second positioning portion and the first positioning portion remain mating.

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