Curtain lifting control device and curtain

Abstract

The embodiment of the invention provides a curtain lifting control device and a curtain, the device comprises two rope winding assemblies assembled on an upper beam, each rope winding assembly comprises a base, a rope winding drum and a bearing rope, the base is provided with an upper rope penetrating hole and a lower rope penetrating hole for the outer end of the bearing rope to sequentially penetrate through, and the upper rope penetrating hole and the lower rope penetrating hole are communicated through the rope winding drum; the outer ends of the bearing ropes penetrate through the upper beam, extend downwards and are connected to a curtain body of the curtain. The power assembly drives the two rope winding drums to rotate synchronously through a transmission shaft; the two ratchet wheels are coaxially fixed with the transmission shaft; each pawl comprises a pivoting part, a clamping jaw part and an abutting part, and the gravity center of each pawl is located on one side of the corresponding clamping jaw part. The pawl is under the action of gravity in a natural state, so that the clamping jaw part is clamped with the ratchet wheel, and the part, abutted by the abutting part, of the bearing rope is located on the side, away from the clamping jaw part, of the connecting line of the upper rope penetrating hole and the lower rope penetrating hole. According to the embodiment of the invention, the curtain body can be prevented from inclining in the downward pulling process.

Description

Curtain lifting control device and curtain Technical Field

[0001] The embodiments of the present application relate to the technical field of curtains, and in particular to a curtain lifting control device and a curtain. Background Art

[0002] An existing curtain lifting drive device includes: two rope winding assemblies assembled on the upper beam of the curtain at a predetermined interval, each rope winding assembly including a base, a rope winding drum pivotally mounted on the base, and a load-bearing rope wound around the rope winding drum, the outer end of the load-bearing rope extending downward through the upper beam and connected to the curtain body; and a power assembly assembled on the upper beam and driving the rope winding drums of the two rope winding assemblies to rotate synchronously through a transmission shaft.

[0003] During the specific implementation, the inventors found that the above-mentioned device has some defects when in use: since it is easy to apply unbalanced force to the window when pulling the curtain body (for example, pulling the curtain body downward at one end), the load-bearing rope connected to one end of the curtain body is tightened while the load-bearing rope connected to the other end of the curtain body is loose, causing the curtain body to become skewed and unbalanced, and the operation is smooth and smooth. The corresponding loose load-bearing rope is also prone to accidental entanglement, thereby affecting the normal use of the curtain. Technical issues

[0004] The technical problem to be solved by the embodiments of the present application is to provide a curtain lifting control device that can prevent the curtain body from tilting during the downward pulling process.

[0005] The technical problem to be further solved by the embodiments of the present application is to provide a curtain that can prevent the curtain body from tilting during the process of being pulled down. Technical Solutions

[0006] To solve the above technical problems, the embodiments of the present application adopt the following technical solutions: a curtain lifting control device, comprising:

[0007] Two rope winding assemblies are assembled to the upper beam of the curtain at a predetermined interval, each rope winding assembly comprising a base, a rope winding drum pivotally mounted on the base, and a load rope wound around the rope winding drum. The top and bottom of the base are respectively provided with an upper rope passing hole and a lower rope passing hole. The outer end of the load rope passes through the upper rope passing hole and the lower rope passing hole in sequence from top to bottom, then passes through the upper beam, extends downward, and is connected to the curtain body;

[0008] A power assembly assembled on the upper beam and driving the rope drums of the two rope winding assemblies to rotate synchronously through a transmission shaft;

[0009] two ratchet wheels coaxially fixed to the transmission shaft; and

[0010] Two pawls are pivoted on different bases and used to control the unidirectional rotation of a corresponding ratchet, the pawl comprising a pivot portion pivotally connected to the base and a claw portion and an abutment portion extending from opposite sides of the pivot portion, the claw portion being engaged with the ratchet, the abutment portion abutting against the carrying rope, the center of gravity of the pawl being on one side of the claw portion, and the pawl being acted upon by gravity in a natural state so that the claw portion is engaged with the ratchet and the portion of the carrying rope abutted by the abutment portion is on the side of the line connecting the upper rope threading hole and the lower rope threading hole away from the claw portion.

[0011] Furthermore, the portion of the abutting portion for abutting against the carrying rope is an arc surface.

[0012] Furthermore, the abutting portion is formed by obliquely extending downward from one side of the pivoting portion.

[0013] Furthermore, the base includes a bottom box and a mounting bracket assembled at one end of the bottom box, the rope drum is pivotally connected to the inside of the bottom box, the transmission shaft passes through the mounting bracket and the rope drum in sequence, the pawl is pivotally connected to the mounting bracket, the upper rope passing hole and the lower rope passing hole are respectively opened on the top of the mounting bracket and the bottom plate of the bottom box, and a rope guide hole is also provided in the middle of one side plate of the bottom box for guiding the load-bearing rope extending from the rope drum to the top of the mounting bracket.

[0014] Furthermore, the base also includes a cover plate that corresponds to the top of the bottom box and covers the rope drum and the mounting frame. A rope guide opening is provided on the cover plate at a position opposite the upper rope passing hole. The outer surface of the cover plate is provided with a rope guide groove that guides the load-bearing rope extending from the rope guide hole to extend to the rope guide opening and then downward into the upper rope passing hole.

[0015] Furthermore, the mounting frame has two parallel vertical plates with corresponding depressions at predetermined positions of the top edges to form pivot grooves, and a top plate connected to the top edges of the two vertical plates at positions staggered from the pivot grooves. A pivot shaft is protruded from the middle of each end of the ratchet. The ratchet is arranged between the two vertical plates and the pivot shafts at both ends are correspondingly pivoted in the pivot grooves on the two vertical plates. A pivot hole is also provided on the vertical plate at a position higher than the ratchet. The pawl is arranged between the two vertical plates and is pivoted at the pivot hole by means of a pivot. The upper rope threading hole is provided on the top plate.

[0016] Furthermore, the top edge of each vertical plate forms a high-order top edge and a low-order top edge with a height difference, the high-order top edge and the low-order top edge are connected by a vertical connecting surface, the high-order top edges of the two vertical plates are connected by the top plate, and the pivot groove is formed on the low-order top edge.

[0017] Furthermore, the groove wall of the pivot groove close to the high-step top edge is connected to the vertical connecting surface, and the groove wall of the pivot groove on at least one of the vertical plates away from the high-step top edge is provided with a limiting protrusion for limiting the pivot shaft in the pivot groove at the groove opening close to the pivot groove, and a guide protrusion for guiding the pivot shaft to be inserted into the pivot groove is provided at a position higher than the limiting protrusion on the groove wall on the other side or the vertical connecting surface.

[0018] On the other hand, in order to solve the above-mentioned further technical problems, the present application further provides the following technical solutions: a curtain, comprising an upper beam, a curtain lifting control device assembled on the upper beam, and a curtain body arranged below the upper beam and connected to the curtain lifting control device, wherein the curtain lifting control device is a curtain lifting control device as described in any one of the above items.

[0019] Furthermore, the curtain body includes an upper curtain body and a lower curtain body arranged side by side up and down, and the curtain includes two curtain lifting control devices respectively connected to and controlling the upper curtain body and the lower curtain body. The two curtain lifting control devices are assembled side by side in the upper beam, and the bases belonging to the two curtain lifting control devices and located at the same end of the upper beam are connected as one. Beneficial effects

[0020] By adopting the above technical solution, the embodiment of the present application has at least the following beneficial effects: the embodiment of the present application coaxially fixes two ratchets on the transmission shaft of the power assembly, and pivotally arranges a pawl on the base of each rope winding assembly, the middle part of the pawl is a pivotal part, and the two sides are respectively provided with a claw part for engaging with a corresponding ratchet and an abutting part for abutting with the load-bearing rope of the rope winding assembly. When any load-bearing rope is not subjected to a downward pulling force other than the weight of the curtain, the corresponding pawl will rotate and droop under the action of its own gravity, so that the claw part of the pawl engages with the corresponding ratchet and limits the transmission shaft to only one-way rotation transmission. At the same time, the abutting part of the pawl will push the corresponding section of the corresponding load-bearing rope away from the claw part. Specifically, the part where the load-bearing rope abuts with the abutting part will pass the line connecting the upper rope threading hole and the lower rope threading hole on the base and be located on the side away from the claw part. Therefore, when pulling down the curtain, if the force is uneven and one of the load cords is not tightened, the corresponding pawl will engage with the ratchet, preventing the drive shaft from rotating and transmitting, and the entire curtain cannot be pulled down. Only when the force is balanced and both load cords are effectively tightened, each load cord will force the abutment portion of the corresponding pawl to rotate downward, causing the pawl portion to rotate and disengage from the ratchet. The drive shaft is unrestricted and can transmit normally, allowing the curtain to be pulled down normally, thus effectively preventing the curtain from tilting during the pulling process. During the curtain raising operation, the drive shaft rotates in the other direction, and the pawl will not affect the rotation of the ratchet, so the curtain can also be raised normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of a partially disassembled state of an optional embodiment of the curtain lifting control device of the present application.

[0022] FIG2 is a schematic structural diagram of a partially disassembled state of another optional embodiment of the curtain lifting control device of the present application.

[0023] FIG3 is a schematic structural diagram of the curtain lifting control device of the present application in a partially assembled state on the mounting frame.

[0024] FIG4 is a schematic structural diagram of the curtain lifting control device of the present application in a partially assembled state on a mounting frame.

[0025] FIG5 is a schematic plan cross-sectional view of the curtain lifting control device of the present application showing the pawl and the ratchet wheel in an engaged state.

[0026] FIG6 is a schematic plan cross-sectional view of the curtain lifting control device of the present application in which the pawl and the ratchet wheel are in a disengaged state.

[0027] FIG7 is a schematic structural diagram of an optional embodiment of the curtain of the present application. Modes for Carrying Out the Invention

[0028] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present application and are not intended to limit the present application. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0029] As shown in FIG1 to FIG6 , an optional embodiment of the present application provides a curtain lifting control device, comprising:

[0030] Two rope winding assemblies are assembled to the upper beam 10 of the curtain at a predetermined interval. Each rope winding assembly includes a base 11, a rope winding drum 12 pivotally mounted on the base 11, and a load rope 13 wound around the rope winding drum 12. The top and bottom of the base 11 are respectively provided with an upper rope threading hole 111 and a lower rope threading hole 112. The outer end of the load rope 13 passes through the upper rope threading hole 111 and the lower rope threading hole 112 from top to bottom, then passes through the upper beam 10, extends downward, and is connected to the curtain body 100.

[0031] A power assembly 3 assembled on the upper beam 10 and driving the rope drums 12 of the two rope winding assemblies to rotate synchronously through the transmission shaft 2;

[0032] Two ratchet wheels 4 fixed coaxially with the transmission shaft 2; and

[0033] Two pawls 5 are pivoted on different bases 11 and used to control the unidirectional rotation of a corresponding ratchet 4. The pawl 5 includes a pivot portion 51 for pivoting with the base 11 and a claw portion 52 and an abutment portion 53 extending from opposite sides of the pivot portion 51. The claw portion 52 is engaged with the ratchet 4, and the abutment portion 53 abuts against the carrying rope 13. The center of gravity of the pawl 5 is located on one side of the claw portion 52. In a natural state, the pawl 5 is acted upon by gravity so that the claw portion 52 is engaged with the ratchet 4 and the portion of the carrying rope 13 abutted by the abutment portion 53 is on the side of the line connecting the upper rope threading hole 111 and the lower rope threading hole 112 away from the claw portion 52.

[0034] The embodiment of the present application is to coaxially fix two ratchets 4 on the transmission shaft 2 of the power assembly, and pivotally set a pawl 5 on the base 11 of each rope winding assembly, the middle part of the pawl 5 is a pivoting part 51, and the two sides are respectively provided with a claw part 52 for engaging with the corresponding ratchet 4 and an abutting part 53 for abutting with the carrying rope 13 of the rope winding assembly. When any carrying rope 13 is not subjected to a downward pulling force other than the gravity of the curtain body 100, the corresponding pawl 5 will rotate and droop under the action of its own gravity, so that the claw part 52 of the pawl 5 is engaged with the corresponding ratchet 4 and limits the transmission shaft 2 to only one-way rotation transmission. At the same time, the abutting part 53 of the pawl 5 will push the corresponding section of the corresponding carrying rope 13 away from the claw part 52. Specifically, the part where the carrying rope 13 abuts with the abutting part 53 will pass the line connecting the upper rope threading hole 111 and the lower rope threading hole 112 on the base 11 and be located on the side away from the claw part 52. Therefore, when lowering the curtain 100, if the force is uneven, resulting in one of the support cords 13 not being tightened, the corresponding pawl 5 will engage with the ratchet 4, preventing the drive shaft 2 from rotating and transmitting, preventing the entire curtain 100 from being lowered. Only when the force is balanced and both support cords 13 are effectively tightened, each support cord 13 will force the corresponding abutment portion 53 of the pawl 5 to rotate downward, causing the pawl portion 52 to rotate away from the ratchet 4. The drive shaft 2 is unrestricted and can transmit normally, allowing the curtain 100 to be lowered normally, thereby effectively preventing the curtain 100 from tilting during the lowering process. During the raising operation of the curtain 100, the drive shaft 2 rotates in the other direction, and the pawl 5 does not affect the rotation of the ratchet 4, so the curtain 100 can also be raised normally. In a specific implementation, the power assembly 3 can be a spring motor, and one or more power assemblies 3 can be provided accordingly depending on the required driving force.

[0035] In an optional embodiment of the present application, as shown in FIG3 , the portion of the abutting portion 53 for abutting the carrying rope 13 is a circular arc surface 530. In this embodiment, by providing the circular arc surface 530 at the portion where the abutting portion 53 abuts the carrying rope 13, the friction between the carrying rope 13 and the abutting portion 53 can be reduced, and the carrying rope 13 is prevented from being scratched in the contact pawl 5, which helps to ensure the durability of the carrying rope 13.

[0036] In an optional embodiment of the present application, as shown in Figures 1 to 6, the abutment portion 53 extends obliquely downward from one side of the pivotal portion 51. In this embodiment, the abutment portion 53 is disposed obliquely below the pivotal portion 51, effectively extending the vertical distance between the portion of the abutment portion 53 that abuts the load rope 13 and the pivotal portion 51, thereby extending the moment arm during the rotation of the pawl 5 and facilitating the rotation of the pawl 5.

[0037] In an optional embodiment of the present application, as shown in Figures 1 to 6, the pawl 5 further includes a counterweight portion 54 extending from one end of the claw portion 52 away from the pivot portion 51. In this embodiment, the counterweight portion 54 is a counterweight block integrally processed and extended from the claw portion 52. By providing the counterweight block on the pawl 5, it is ensured that the center of gravity of the pawl 5 is always on the side away from the abutment portion 53 and closer to the claw portion 52, which can effectively ensure the smooth operation of the pawl 5.

[0038] In an optional embodiment of the present application, the upper and lower rope-threading holes 111 and 112 are coaxially arranged in a vertically opposed relationship. In this embodiment, the coaxial arrangement of the upper and lower rope-threading holes 111 and 112 makes the design of the threading layout for the supporting rope 13 within the base 11 more rational, and the structure is more compact and aesthetically pleasing. Alternatively, the upper and lower rope-threading holes 111 and 112 can be staggered based on the actual threading layout within the base 11 or the connection position of the supporting rope 13 on the curtain body 100, as shown in Figures 5 and 6.

[0039] In an optional embodiment of the present application, as shown in Figures 1 to 4, the base 11 includes a bottom box 113 and a mounting frame 114 assembled at one end inside the bottom box 113, the rope drum 12 is pivoted to the inside of the bottom box 113, the transmission shaft 2 passes through the mounting frame 114 and the rope drum 112 in sequence, the pawl 5 is pivoted to the mounting frame 114, the upper rope hole 111 and the lower rope hole 112 are respectively opened on the top of the mounting frame 114 and the bottom plate of the bottom box 113, and a rope guide hole 1131 is also provided in the middle of one side panel of the bottom box 113 to guide the load-bearing rope 13 extending from the rope drum 12 to the top of the mounting frame 114. In this embodiment, the base 11 is provided with a bottom box 113 and a mounting frame 114 assembled in the bottom box 113, which is conducive to the disassembly and assembly between the components and the base 11 and the processing and forming of the base 11. In addition, a rope guide hole 1130 is provided in the middle of a side panel of the bottom box 113, so that the load-bearing rope 13 extending from the rope drum 12 is guided to the upper rope hole 111 at the top of the mounting frame 114, which can reasonably and effectively utilize the space of the base 11 for threading layout.

[0040] In an optional embodiment of the present application, as shown in Figures 1 to 4, the base 11 also includes a cover plate 115 that corresponds to the top of the bottom box 113 and covers the rope drum 12 and the mounting bracket 114. A rope guide opening 1152 is provided on the cover plate 115 at a position opposite to the upper rope threading hole 111. The outer surface of the cover plate 115 is provided with a rope guide groove 1151 that guides the carrying rope 13 extending from the rope guide hole 1130 to the rope guide opening 1152 and then downwardly penetrates into the upper rope threading hole 111. In this embodiment, a cover plate 115 is correspondingly provided on the top of the base box 113, which can effectively shield and protect the components installed in the base box 113 and the mounting frame 114, and the corresponding guide rope groove 1151 and guide rope opening 1152 are conveniently provided on the cover plate 115 so that the carrying rope 13 extending from the guide rope hole 1130 can pass through the guide rope groove 1151 and the guide rope opening 1152 and extend upward to the rope threading hole 111, thereby reasonably and effectively utilizing the space of the base 11 for threading layout.

[0041] In an optional embodiment of the present application, as shown in Figures 1 to 4, the mounting frame 114 has two parallel vertical plates 1141 with corresponding recesses at predetermined positions on the top edges to form pivot grooves 1140, and a top plate 1142 connected to the top edges of the two vertical plates 1141 at positions staggered from the pivot grooves 1140. A pivot shaft 40 is protruded from the middle of each end of the ratchet 4. The ratchet 4 is arranged between the two vertical plates 1141 and the pivot shafts 40 at both ends are correspondingly pivoted in the pivot grooves 1140 on the two vertical plates 1142. A pivot hole 1143 is also provided on the vertical plate 1141 at a position higher than the ratchet 4. The pawl 5 is arranged between the two vertical plates 1141 and is pivoted at the pivot hole 1143 by means of a pivot 6. The upper rope threading hole 111 is provided on the top plate 1142. In this embodiment, the mounting frame 114 includes two vertical plates 1141 and a top plate 1142 connected to the two vertical plates 1141, so that the pawl 5 is arranged between the two vertical plates 1141 and is pivoted to the pivot hole 1143 by means of the pivot 6. In addition, a pivot shaft 40 is protruded from the middle of each end of the ratchet 4 and is correspondingly pivoted on the pivot grooves 1140 formed by the two top edge recesses of the vertical plates 1141, so that the rotation of the ratchet 4 is more stable and it is beneficial to keep the transmission shaft 2 parallel, and the two vertical plates 1141 just abut against the two end surfaces of the ratchet 4, thereby realizing the axial fixation of the ratchet 4.

[0042] In addition, the pawl 5 is also provided with a second pivot hole 50, through which the pivot 6 passes through the pivot hole 1143 and the second pivot hole 50 in turn, and the pawl 5 is pivoted to the mounting frame 114. The upper rope threading hole 111 is set at the top end of the mounting frame 114, and the lower rope threading hole 112 is set at the bottom end of the bottom box 113. The first rope guide member 1110 is also embedded in the upper rope threading hole 111, and the second rope guide member 1120 is also embedded in the lower rope threading hole 112, both of which can effectively guide the carrying rope 13 to bend and turn, thereby reducing the wear of the carrying rope 13.

[0043] In an optional embodiment of the present application, as shown in FIG3 , the top edge of each vertical plate 1141 forms a high-step top edge 1145 and a low-step top edge 1146 with a height difference. The high-step top edge 1145 and the low-step top edge 1146 are connected by a vertical connecting surface 1147. The high-step top edges 1145 of the two vertical plates 1141 are connected by the top plate 1142, and the pivot groove 1140 is formed on the low-step top edge 1146. In this embodiment, by connecting the high-step top edges 1145 of the two vertical plates 1141 with the top plate 1142 and forming the pivot groove 1140 on the low-step top edge 1146, a significant height difference is formed between the pawl 5 and the ratchet 4 mounted on the mounting frame 114, which helps optimize the spatial layout of the mounting frame 114.

[0044] In an optional embodiment of the present application, as shown in Figures 1 to 4, a plurality of connecting grooves 20 are provided on the axial surface of the transmission shaft 2, and a through hole 41 having a plurality of ribs 42 on the inner wall is provided in the middle of the ratchet 4. The ribs 42 are correspondingly snapped into the connecting grooves 20 to circumferentially fix the ratchet 4 to the transmission shaft 2. In this embodiment, multiple ribs 42 are further provided on the inner wall of the through hole 41 of the ratchet 4 for correspondingly snapping into the connecting grooves 20 on the transmission shaft 2, thereby facilitating rapid positioning and assembly of the ratchet 4 and the transmission shaft 2, while also achieving circumferential fixation between the ratchet 4 and the transmission shaft 2.

[0045] In an optional embodiment of the present application, as shown in Figures 1 to 4, the groove wall of the pivot groove 1140 close to the high-order top edge 1145 is connected to the vertical connecting surface 1147, and the groove wall of the pivot groove 1140 on at least one vertical plate 1141 away from the high-order top edge 1145 is provided with a limiting protrusion 1143 at the groove opening close to the pivot groove 1140 for limiting the pivot shaft 40 in the pivot groove 1140, and a guide protrusion 1144 for guiding the pivot shaft 40 to be inserted into the pivot groove 1140 is provided at a position higher than the limiting protrusion 1143 on the groove wall on the other side or the vertical connecting surface 1147. In this embodiment, by respectively arranging a limiting protrusion 1143 and a guiding protrusion 1144 on the corresponding groove walls of the vertical plate 1141, the ratchet 4 can be quickly oriented on the pivotal groove 1140 after being guided by the guiding protrusion 1144 above the pivotal groove 1140, and the limiting protrusion 1143 can clamp the ratchet 4 installed in the pivotal groove 1140, so that the positioning and installation are more stable and less likely to move.

[0046] On the other hand, as shown in FIG1 , an embodiment of the present application further provides a curtain, comprising an upper beam 200, a curtain lifting control device assembled on the upper beam 200, and a curtain body 100 disposed below the upper beam 200 and connected to the curtain lifting control device, wherein the curtain lifting control device is the curtain lifting control device described in any of the above embodiments. The curtain lifting control device of the embodiment of the present application adopts the curtain lifting control device described in any of the above embodiments, which can prevent the curtain from tilting when the curtain body 100 is pulled down.

[0047] It should be noted that, although the curtain shown in FIG1 is a honeycomb curtain, the curtain lifting control device provided in the embodiment of the present application can also be applied to curtains such as Venetian blinds and Roman blinds.

[0048] In an optional embodiment of the present application, to further achieve curtain raising and lowering control of a sectional curtain, as shown in FIG6 , the curtain body 100 includes an upper curtain body 101 and a lower curtain body 102 arranged side by side. The curtain includes two curtain raising and lowering control devices, each connected to and controlling the upper curtain body 101 and the lower curtain body 102. The two curtain raising and lowering control devices are assembled side by side within the upper beam 200, and the bases 11 belonging to the two curtain raising and lowering control devices and located at the same end of the upper beam 200 are connected as a whole. In this embodiment, two curtain raising and lowering control devices 1 can be provided to connect to different parts of the curtain body 100 to drive the curtain body 100 to move separately. The carrying ropes 13 of the two curtain raising and lowering control devices respectively drive the upper curtain body 101 and the lower curtain body 102, which are separated by the center beam 200, to achieve different window covering effects for the upper curtain body 101 and the lower curtain body 102. In addition, the bases 11 belonging to the two curtain lifting control devices and located at the same end of the upper beam 200 are connected together. Specifically, the bottom box 113 corresponding to the base 11 can be integrated into a single component, and the mounting frame 114 can also be connected into a single component for integrated molding. This can reduce the number of components and facilitate manufacturing and assembly. The upper curtain body 101 and the lower curtain body 102 can be honeycomb curtain bodies, Venetian blinds, Roman curtain bodies, etc.

[0049] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application 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 this application, ordinary technicians in this field can make many variations without departing from the purpose of this application and the scope of protection of the claims, which all fall within the scope of protection of this application.

Claims

1. A curtain lifting control device, comprising: Two rope winding assemblies assembled on the upper beam of the curtain at a predetermined interval. Each rope winding assembly includes a base, a rope winding cylinder pivotally provided on the base, and a load-bearing rope wound around the rope winding cylinder. The outer end of the load-bearing rope passes through the upper beam and extends downward to be connected to the curtain body; and A power assembly assembled on the upper beam and driving the rope winding cylinders of the two rope winding assemblies to rotate synchronously through a transmission shaft; It is characterized in that An upper rope passing hole and a lower rope passing hole are respectively provided at the top and bottom of the base, and the outer end of the load-bearing rope sequentially passes through the upper rope passing hole and the lower rope passing hole from top to bottom; The curtain lifting control device further includes: Two ratchets coaxially fixed with the transmission shaft; and Two pawls respectively pivotally provided on different bases and used to control the one-way rotation of a corresponding ratchet. Each pawl includes a pivoting portion for pivoting with the base, and a claw portion and an abutting portion respectively extending from opposite sides of the pivoting portion. The claw portion is in clamping cooperation with the ratchet, the abutting portion abuts against the load-bearing rope, the center of gravity of the pawl is located on the side close to the claw portion, and in the natural state, the pawl is affected by gravity to make the claw portion engage with the ratchet and the portion of the load-bearing rope abutted by the abutting portion is on the side of the connection line between the upper rope passing hole and the lower rope passing hole away from the claw portion.

2. The curtain lifting control device according to claim 1, It is characterized in that The portion of the abutting portion for abutting against the load-bearing rope is an arc surface.

3. The curtain lifting control device according to claim 1 or 2, It is characterized in that The abutting portion extends obliquely downward from one side of the pivoting portion.

4. The curtain lifting control device according to claim 1, It is characterized in that The base includes a bottom box and a mounting bracket assembled at one end inside the bottom box. The rope winding cylinder is pivotally connected inside the upper part of the bottom box. The transmission shaft sequentially passes through the mounting bracket and the rope winding cylinder. The pawl is pivotally connected to the mounting bracket. The upper rope passing hole and the lower rope passing hole are respectively opened at the top of the mounting bracket and the bottom plate of the bottom box. A rope guiding hole for guiding the load-bearing rope extending from the rope winding cylinder to the top of the mounting bracket is further provided in the middle of one side plate of the bottom box.

5. The curtain lifting control device according to claim 4, It is characterized in that The base further includes a cover plate correspondingly covering the top of the bottom box to cover the rope winding cylinder and the mounting bracket. A rope guiding port is opened at a position on the cover plate corresponding to the upper rope passing hole. A rope guiding groove for guiding the load-bearing rope extending from the rope guiding hole to the rope guiding port and then downward into the upper rope passing hole is provided on the outer surface of the cover plate.

6. The curtain lifting control device according to claim 4, It is characterized in that The mounting frame comprises two parallel vertical plates with corresponding depressions at predetermined positions of the top edges to form pivot grooves, and a top plate connected to the top edges of the two vertical plates at positions offset from the pivot grooves. A pivot shaft is protruded from the middle of each of the two ends of the ratchet. The ratchet is arranged between the two vertical plates, and the pivot shafts at both ends are correspondingly pivoted in the pivot grooves on the two vertical plates. A pivot hole is also provided on the vertical plate at a position higher than the ratchet. The pawl is arranged between the two vertical plates and is pivoted at the pivot hole by means of a pivot. The upper rope threading hole is provided on the top plate.

7. The curtain lifting control device according to claim 6, It is characterized in that The top edge of each vertical plate forms a high-order top edge and a low-order top edge with a height difference, the high-order top edge and the low-order top edge are connected by a vertical connecting surface, the high-order top edges of the two vertical plates are connected by the top plate, and the pivot groove is formed on the low-order top edge.

8. The curtain lifting control device according to claim 7, It is characterized in that The groove wall of the pivot groove close to the high-step top edge is connected to the vertical connecting surface, and the groove wall of the pivot groove on at least one of the vertical plates away from the high-step top edge is provided with a limiting protrusion near the groove opening of the pivot groove for limiting the pivot shaft in the pivot groove, and a guide protrusion for guiding the pivot shaft to be inserted into the pivot groove is provided at a position higher than the limiting protrusion on the groove wall on the other side or the vertical connecting surface.

9. A curtain comprising an upper beam, a curtain lifting control device assembled on the upper beam, and a curtain body arranged below the upper beam and connected to the curtain lifting control device. It is characterized in that The curtain lifting control device is the curtain lifting control device as described in any one of claims 1-8.

10. The curtain according to claim 9, It is characterized in that The curtain body includes an upper curtain body and a lower curtain body arranged side by side up and down, and the curtain includes two curtain lifting control devices which are respectively connected to and control the upper curtain body and the lower curtain body. The two curtain lifting control devices are assembled side by side in the upper beam, and the bases belonging to the two curtain lifting control devices and located at the same end of the upper beam are connected as a whole.

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