Rolling belt connecting device for blinds and blinds

Abstract

The present invention discloses a belt connection device for Venetian blinds and Venetian blinds, and relates to the field of Venetian blinds. The belt connection device for Venetian blinds includes a first fastener connected to the belt, a second fastener in contact with the first fastener, a third fastener connected to the second fastener, and a rod provided on the Venetian blinds and connected to the third fastener. One end of the belt passes through the second fastener and is wound around the first fastener. The first fastener abuts against one side of the second fastener to fix one end of the belt in the second fastener. The third fastener is slidably connected to the rod, and the third fastener can be connected to the second fastener to fix the second fastener on the rod. The Venetian blinds include the belt connection device for Venetian blinds as described above. The present invention can facilitate the installation of the connecting belt, ensure a stable connection, and facilitate disassembly and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of Venetian blinds, and in particular to a rolling belt connecting device for Venetian blinds and the Venetian blinds. Background Art

[0002] Venetian blinds, as essential devices for building sunshade and interior lighting control, rely on the stability and ease of operation of their cable systems. Traditional Venetian blinds achieve lift and angle adjustment through mechanical linkage between cable, blades, and upper and lower beams. However, existing cable designs generally utilize thin, circular-cross-section cords (such as nylon or polyester). This cross-sectional shape makes them prone to rotation when subjected to force, compromising force transmission stability. Furthermore, the contact area is small, limiting load-bearing capacity. To address this, some companies have replaced the circular-cross-section cords with long, flat ribbons to raise and lower the blinds. However, some companies still use the same method to secure the ribbons, directly tying one end of the ribbon to the lower or upper rods. However, the long, flat shape of the ribbons makes them difficult to wrap and tie directly. This method and structure requires a long operation time, and the tying relies on friction and knot strength, making them prone to loosening after prolonged use. Removal requires damaging the existing structure, making installation and removal difficult and lacking stability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a tape connection device for blinds, which can facilitate the installation of the connecting tape, ensure a stable connection, and facilitate disassembly and maintenance.

[0004] In order to solve the above technical problems, the present invention provides a roll-up belt connection device for Venetian blinds, which is used to hang or fix the roll-up belt of Venetian blinds, including a first fastener connected to the roll-up belt, a second fastener in contact with the first fastener, a third fastener connected to the second fastener, and a rod provided on the Venetian blinds and connected to the third fastener.

[0005] One end of the roll belt passes through the second fastener and is wound in the first fastener. The first fastener abuts against one side of the second fastener to fix the one end of the roll belt in the second fastener.

[0006] The third fastener is slidably connected to the rod, and the third fastener can be connected to the second fastener to fix the second fastener on the rod.

[0007] As an improvement to the above solution, the second fastener includes a belt hole, which longitudinally passes through the main body of the second fastener, and one end of the tape can pass through the belt hole and be connected to the first fastener.

[0008] The length of the cross section of the belt-through hole is greater than the width of the rolled belt.

[0009] As an improvement of the above solution, the first fastener includes a limiting arm, which extends from both sides. The horizontal length of the limiting arm is greater than the cross-sectional length of the belt hole, and the limiting arm can abut against the side of the belt hole.

[0010] As an improvement of the above-mentioned solution, the third fastener includes a folding arm, and the folding arm includes a slide bar, which protrudes outward from both sides of the third fastener. The surface of the rod is provided with a slide groove, and the slide groove is recessed inward. The slide bar can be inserted into the slide groove and can slide in the slide groove.

[0011] As an improvement to the above-mentioned solution, a fixing hole is provided in the rod, and the second fastener includes an insertion portion and an outer blocking portion, the insertion portion can be inserted into the fixing hole, and the outer blocking portion can cover the fixing hole; after the insertion portion is inserted into the fixing hole, the third fastener can slide to the position of the second fastener and connect with the second fastener.

[0012] As an improvement of the above-mentioned solution, a limiting groove is provided between the end of the insertion part and the end of the outer blocking part, and a limiting plate is provided on the third fastener. The limiting plate is arranged between the two folding arms. After the third fastener slides to the position of the second fastener, the limiting plate can be inserted into the limiting groove. At this time, the folding arms are surrounded on both sides of the second fastener.

[0013] As an improvement of the above-mentioned solution, the folding arm also includes a folding plate, which is arranged on the inner side of the folding arm and extends toward the inner side of the third fastener. After the third fastener slides to the position of the second fastener, the inner side of the folding plate can abut against the side wall of the insertion part or be located on the side of the insertion part.

[0014] As an improvement of the above-mentioned solution, a buckle is provided on the inner side of the folding plate, and the buckle protrudes from the inner side of the folding plate toward the inner side of the third fastener. The outer surface of the buckle is arc-shaped, and a slot is provided on the side of the insertion part. The slot is recessed in the surface of the insertion part, and the inner surface of the slot is arc-shaped. After the third fastener slides to the position of the second fastener, the buckle can be inserted into the slot.

[0015] As an improvement of the above-mentioned solution, the folding arm also includes a connecting plate, which is connected between the slide bar and the folding plate. The longitudinal section of the folding plate, the connecting plate and the slide bar forms a "Z" shape. A boss is provided in the middle of the rod, and the boss protrudes from the surface of the slide groove. The fixing hole is provided on the boss, and the connecting plates on both sides of the limit plate can surround both sides of the boss.

[0016] As an improvement of the above solution, the third fastener also includes a protruding plate, which is arranged on the edge of the third fastener and protrudes from the surface of the limiting plate. After the limiting plate is inserted into the limiting groove, the edge of the outer blocking part can abut against the edge of the protruding plate.

[0017] As an improvement to the above-mentioned solution, a mounting groove is further provided between the end of the insertion portion and the end of the outer blocking portion. The mounting groove is provided at the end of the second fastener away from the limiting groove. The slot direction of the mounting groove is opposite to the slot direction of the limiting groove, and the structural edge of the fixing hole can be inserted into the mounting groove.

[0018] As an improvement to the above scheme, the second fastener also includes a first rope threading hole and a second rope threading hole, and the first rope threading hole and the second rope threading hole longitudinally penetrate the main body of the second fastener. The draw rope of the blinds can pass through the first rope threading hole into the second fastener and pass through the second rope threading hole out of the second fastener.

[0019] As an improvement of the above solution, the first fastener also includes a first horizontal bar, a second horizontal bar and a third horizontal bar, a first winding hole is formed between the first horizontal bar and the second horizontal bar, a second winding hole is formed between the second horizontal bar and the third horizontal bar, and the first winding hole and the second winding hole are arranged adjacent to each other.

[0020] As an improvement to the above scheme, one end of the tape is first wrapped around one side of the first fastener to form an initial outer layer, and then wrapped from the initial outer layer around the outer side of the first horizontal bar to form a first outer layer and pass through the second winding hole in the first direction, then wrap around the second horizontal bar to form a first inner layer and pass through the first winding hole in the second direction, then wrap around the first horizontal bar to form a second inner layer and wrap around the outer side of the first horizontal bar in the first direction and form a third inner layer on the other side of the first horizontal bar, the tape extends from the third inner layer to the side of the second horizontal bar to form a second outer layer, extends to the side of the third horizontal bar to form a fourth inner layer, and finally wraps around the outer side of the third horizontal bar in the second direction and extends to the side of the first horizontal bar to form a third outer layer.

[0021] The present invention also provides a Venetian blind comprising the aforementioned tape connecting device for the Venetian blind.

[0022] The implementation of the present invention has the following beneficial effects:

[0023] The belt connection device for a Venetian blind of the present invention is provided with a first fastener, a second fastener, a third fastener, and a rod. The first fastener, the second fastener, and the third fastener are capable of fixing one end of the belt to the rod. During installation, one end of the belt is first passed through the second fastener and wound around the first fastener, so that one end of the belt is first fixed to the first fastener. Then, the first fastener abuts against one side of the second fastener, completing the connection between the belt and the second fastener. Finally, the third fastener is capable of connecting to the second fastener. The third fastener is slidably connected to the rod, thereby fixing the second fastener to the rod, thereby achieving the fixation of one end of the belt to the rod. By interconnecting the first fastener, the second fastener and the third fastener, the number of turns of the tape wound and tied can be reduced, and the tying operation time can be reduced. Moreover, by interconnecting the first fastener, the second fastener and the third fastener, the connection strength between the tape and the rod can be improved, and the installation operation is simple and uncomplicated. After installation, the first fastener, the second fastener and the third fastener can also be disassembled separately. Whether they are located at the upper part of the tape to suspend the tape or at the lower part of the tape to fix the tape, they can achieve good disassembly and facilitate later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the partially disassembled structure of the shutter of the present invention;

[0025] Figure 2 1. It is a schematic diagram of the disassembled structure of the belt connecting device for blinds of the present invention;

[0026] Figure 3 2 is a schematic cross-sectional view of a belt connection device for a Venetian blind according to the present invention;

[0027] Figure 4 yes Figure 3 A partial enlarged view of middle A;

[0028] Figure 5 It is a schematic cross-sectional view of the structure of the belt connecting device and the pull cord used for the blinds of the present invention;

[0029] Figure 6 is a schematic cross-sectional view of the present invention's tape wrapped around a first fastener;

[0030] Figure 7 2 is a schematic cross-sectional view of the present invention wherein the tape is wound around the first fastener and engaged with the second fastener;

[0031] Figure 8 It is a structural schematic diagram of the shutter of the present invention. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0033] See also Figure 1 and Figure 2 An embodiment of the present invention discloses a belt connection device for a Venetian blind, which is used to suspend or fix a belt 5 for the Venetian blind. The device includes a first fastener 1 connected to the belt 5, a second fastener 2 in contact with the first fastener 1, a third fastener 3 connected to the second fastener 2, and a rod 4 provided on the Venetian blind and connected to the third fastener 3. The belt 5 is used to connect the blades and can control the raising and lowering of the blades. The rod 4 can be the bottom rod 4 of the Venetian blind. In this structure, the bottom end of the belt 5 is connected to the rod 4, and the rod 4 moves with the belt 5 as it rises and falls. The rod 4 fixes the lower part of the belt 5 to prevent the belt 5 from loosening. In other embodiments, the rod 4 can also be the upper rod 4 of a suspended curtain Venetian blind. In this structure, the upper end of the belt 5 is connected to the rod 4, and the rod 4 suspends the belt 5 through the belt connection device. The rod 4 is stationary and fixed, and the movement of the belt 5 does not affect the rod 4. By using the first fastener 1 , the end of the roll belt 5 can be fixed to the second fastener 2 , and by using the second fastener 2 and the third fastener 3 , the roll belt 5 can be connected to the rod 4 .

[0034] Specifically, one end of the tape 5 passes through the second fastener 2 and is wound around the first fastener 1. The first fastener 1 is used to securely connect the end of the tape 5. The first fastener 1 then abuts against one side of the second fastener 2 to secure one end of the tape 5 in the second fastener 2, thereby connecting the tape 5 to the second fastener 2. To further enhance connection stability, the third fastener 3 is slidably connected to the rod 4. The third fastener 3 can form a movable connection with the rod 4, wherein the third fastener 3 can be connected to the second fastener 2 to secure the second fastener 2 to the rod 4.

[0035] During installation, one end of the tape 5 is first passed through the second fastener 2 and wound around the first fastener 1. The winding action of the first fastener 1 initially secures the end of the tape 5. Subsequently, the first fastener 1 abuts against one side of the second fastener 2, securing the tape 5 between the contact surfaces of the second and first fasteners 2. This prevents the tape 5 from rotating or sliding due to its cross-sectional shape (such as a traditional round drawcord). The third fastener 3 is connected to the rod 4 via a sliding connection for position adjustment and can be secured to the second fastener 2 via a snap-fit connection, thereby locking the fixed end of the tape 5 entirely to the rod 4.

[0036] Compared to the prior art methods of directly tying the drawstring or snapping it onto the plug body 323, this device significantly reduces the complex winding steps required for traditional tying through the modular coordination of the first fastener 1, the second fastener 2, and the third fastener 3. For example, while traditional round cords are prone to rotation due to their cross-sectional shape and require multiple knots for reinforcement, this device, through a combined winding and clamping method, requires only a single winding to achieve a stable connection, significantly shortening operation time and reducing the safety risks associated with loosening of the tie. Furthermore, the sliding connection between the third fastener 3 and the rod 4 allows for flexible adjustment after installation and supports quick disassembly and maintenance, resolving the issue of traditional fixing structures (such as screw fastening or embedding into the plug body) that are difficult to replace or repair individually. Regarding load-bearing performance, the snap-fit connection between the second fastener 2 and the third fastener 3 distributes the load by increasing the contact area (e.g., a flat fastener design), avoiding the localized stress concentration associated with the small cross-section of traditional round cords, thereby improving the reliability and tensile strength of the overall connection. At the same time, the winding and fixing method of the first fastener 1 avoids the limitation of traditional knotting that relies on the friction of the knot, and ensures that the tape 5 is not easy to loosen or deform during long-term use through the dual effects of mechanical clamping and sliding locking.

[0037] The beneficial effects of the embodiments of the present invention are as follows:

[0038] The belt connection device for Venetian blinds according to an embodiment of the present invention is provided with a first fastener 1, a second fastener 2, a third fastener 3 and a rod 4. The first fastener 1, the second fastener 2 and the third fastener 3 can fix one end of the belt 5 to the rod 4. During installation, one end of the belt 5 is first passed through the second fastener 2 and wound around the first fastener 1, so that one end of the belt 5 is first fixed to the first fastener 1. Then, the first fastener 1 abuts against one side of the second fastener 2 to complete the connection between the belt 5 and the second fastener 2. Finally, the third fastener 3 can be connected to the second fastener 2. The third fastener 3 is slidably connected to the rod 4, so that the second fastener 2 can be fixed to the rod 4, thereby achieving the fixation of one end of the belt 5 to the rod 4. By interconnecting the first fastener 1, the second fastener 2 and the third fastener 3, the number of turns of the tape 5 wound and tied can be reduced, and the tying operation time can be reduced. Moreover, by interconnecting the first fastener 1, the second fastener 2 and the third fastener 3, the connection strength between the tape 5 and the rod 4 can be improved, and the installation operation is simple and uncomplicated. After installation, the first fastener 1, the second fastener 2 and the third fastener 3 can also be disassembled separately, achieving better disassembly and facilitating later maintenance.

[0039] See also Figure 2 The second fastener 2 includes a through-hole 21 that extends longitudinally through the body of the second fastener 2. One end of the ribbon 5 can pass through the through-hole 21 and connect to the first fastener 1. The cross-sectional length of the through-hole 21 is greater than the width of the ribbon 5. Because the transverse dimension of the through-hole 21 is greater than the width of the ribbon 5, the ribbon 5 can freely adjust its position in the transverse direction within the through-hole 21, avoiding localized stress concentration caused by the deviation of the ribbon 5. After the end of the ribbon 5 is wrapped around the first fastener 1, the thickness of the combined ribbon 5 and the first fastener 1 can be greater than the width of the through-hole 21, thereby forming an interference fit and providing a certain degree of position retention. Compared to the prior art design, which suffers from the tendency of round draw cords to rotate within the through-hole, this design optimizes the transverse dimension of the through-hole 21 to accommodate flat ribbons 5 of varying widths (such as nylon or fabric straps), enhancing torsional resistance and preventing tension imbalance caused by ribbon 5 rotation.

[0040] The first fastener 1 includes a limiting arm 11, which extends from both sides. The horizontal length of the limiting arm 11 is greater than the cross-sectional length of the through hole 21, and the limiting arm 11 can abut against the side of the through hole 21, that is, the bottom surface of the second fastener 2. When the first fastener 1 abuts against the side of the through hole 21 of the second fastener 2, the end of the limiting arm 11 exceeds the edge of the through hole 21, forming a lateral limiting blockage. This design prevents the first fastener 1 from shrinking, disengaging, and other problems in the through hole 21 through mechanical limiting, and avoids the roll 5 from being dislodged or deflected due to external pulling. During the raising and lowering process of the blinds, the abutment between the limiting arm 11 and the side of the through hole 21 can disperse the load transmitted by the roll 5, reduce the dependence on a single fixed point, and improve the tensile strength and durability of the overall connection structure.

[0041] See also Figure 2 In order to connect the third fastener 3 with the rod 4, the third fastener 3 includes a folding arm 32, and the folding arm 32 includes a slide bar 321. The slide bar 321 protrudes outward from both sides of the third fastener 3. The surface of the rod 4 is provided with a slide groove 41 matching the slide bar 321. The slide groove 41 is recessed inward, and the slide bar 321 can be inserted into the slide groove 41 and can slide in the slide groove 41. During installation, the end of the rod 4 is first removed, and the slide 321 is embedded in the slide groove 41. Then, the end of the rod 4 is fixed so that the third fastener 3 will not fall out from the end of the slide groove 41. The slide groove 41 can form a horizontal limit for the slide 321, and the third fastener 3 can only slide in the slide groove 41. Compared with the defect of traditional round pull ropes that are easy to rotate in the slide rail, this design constrains the sliding direction to a single axial direction through the cooperation between the slide 321 and the slide groove 41, effectively eliminating the deflection problem caused by the cross-sectional shape.

[0042] See also Figure 1 The rod 4 is provided with a fixing hole 421, and the second fastener 2 includes an insertion portion 22 and an outer stop portion 23. The insertion portion 22 can be inserted into the fixing hole 421, and the fixing hole 421 can limit and fix the insertion portion 22. The outer stop portion 23 can block the fixing hole 421, and the outer stop portion 23 can be stably abutted against the rod 4 through the third fastener 3. After the insertion portion 22 is inserted into the fixing hole 421, the third fastener 3 can slide to the position of the second fastener 2 and connect with the second fastener 2. The third fastener 3 and the second fastener 2 are connected by a quick-release snap-on structure.

[0043] See also Figure 2A limiting groove 24 is provided between the end of the insertion portion 22 and the end of the outer stop portion 23, and a limiting plate 31 is provided on the third fastener 3. The limiting plate 31 is provided between the two folding arms 32. After the third fastener 3 slides to the position of the second fastener 2, the limiting plate 31 can be inserted into the limiting groove 24. At this time, the folding arms 32 surround the two sides of the second fastener 2. This design forms a double fixation through the mechanical locking of the limiting plate 31 and the limiting groove 24: on the one hand, the limiting plate 31 inserted into the limiting groove 24 can prevent the relative displacement of the second fastener 2 and the third fastener 3 in the vertical direction; on the other hand, the folding arm 32 wraps around the side of the second fastener 2 to further limit the lateral deviation, ensuring the overall stability of the connection structure. Compared with the traditional blinds cord system that only relies on friction or a simple buckle 323 for fixing, this solution significantly improves the tensile strength and vibration resistance through the combination of geometric limiting and wrapping structure.

[0044] See also Figure 3 and Figure 4 The folding arm 32 further includes a folding plate 322, which is disposed on the inner side of the folding arm 32 and extends toward the inner side of the third fastener 3. After the third fastener 3 slides to the position of the second fastener 2, the inner side of the folding plate 322 can abut against the side wall of the insertion portion 22 or be located on the side of the insertion portion 22. The lateral contact between the folding plate 322 and the insertion portion 22 forms an additional support surface, further securing the second fastener 2, thereby effectively preventing the roll belt 5 from moving in the side limit position and preventing the connection of the second fastener 2 from loosening due to the swaying of the blinds.

[0045] See also Figure 2The inner side of the folding plate 322 is provided with a buckle 323, which protrudes from the inner side of the folding plate 322 toward the inner side of the third fastener 3. The outer surface of the buckle 323 is curved. The side of the insertion portion 22 is provided with a slot 221, which is recessed into the surface of the insertion portion 22. The inner surface of the slot 221 is curved. After the third fastener 3 slides to the position of the second fastener 2, the buckle 323 can be inserted into the slot 221. The connection between the buckle 323 and the slot 221 can achieve a quick-release connection. During installation, the third fastener 3 is slid to the position of the second fastener 2, and the buckle 323 can automatically buckle into the slot 221. The slot 221 forms a horizontal limit for the buckle 323. Unlike traditional right-angled buckles 323, the curved structure used in this design reduces sliding friction, facilitating insertion of the buckle 323 into the slot 221. It also strengthens the fit between the buckle 323 and the slot 221, ensuring connection stability. Furthermore, it reduces local stress concentration and reduces the risk of material wear. The embedded structure of the buckle 323 supports non-destructive disassembly. Simply sliding the third fastener 3 in the opposite direction detaches the second fastener 2, facilitating replacement of the tape 5 or repair of components, making maintenance easier.

[0046] See also Figure 4 The folding arm 32 further includes a connecting plate 324 connected between the slide 321 and the folding plate 322. The connecting plate 324 provides a transition between the slide 321 and the folding plate 322 of the folding arm 32. The folding plate 322, the connecting plate 324, and the slide 321 form a "Z" shape in longitudinal cross-section. The rod 4 is provided with a boss 42 in the middle, which protrudes from the surface of the slide groove 41. The fixing hole 421 is provided on the boss 42. The connecting plates 324 on both sides of the limiting plate 31 can surround both sides of the boss 42. During installation, after the slide 321 of the third fastener 3 is inserted into the slide groove 41, the connecting plates 324 are in close contact with the side surfaces of the boss 42, so that the wrapping range of the "Z"-shaped folding arm 32 adapts to the thickness of the boss 42. For example, when the third fastener 3 slides to the position of the second fastener 2, the connecting plate 324 forms a barrier on both sides of the boss 42, limiting the lateral displacement of the third fastener 3 and distributing the load transmitted by the tape 5 through the multiple "Z"-shaped bends, thereby improving the connection strength and the limiting effect. The "Z"-shaped structure of this embodiment of the present invention absorbs stress through geometric deformation, improving bending resistance, and adapting to the installation requirements of bosses 42 of different thicknesses.

[0047] See also Figure 2The third fastener 3 further includes a protruding plate 33, which is provided on the edge of the third fastener 3 and protrudes from the surface of the limiting plate 31. After the limiting plate 31 is inserted into the limiting groove 24, the edge of the outer stop 23 can abut against the edge of the protruding plate 33. This design, through the blocking effect of the protruding plate 33, limits the relative displacement of the second fastener 2 and the third fastener 3 in the horizontal direction, forming a double locking: the vertical direction is restrained by the limiting groove 24 and the limiting plate 31, and the horizontal direction is restrained by the abutment between the protruding plate 33 and the outer stop 23.

[0048] A mounting groove 25 is further provided between the end of the insertion portion 22 and the end of the outer stop portion 23. The mounting groove 25 is provided at the end of the second fastener 2 away from the limiting groove 24. The notch direction of the mounting groove 25 is opposite to the notch direction of the limiting groove 24, and the structural edge of the fixing hole 421 can be inserted into the mounting groove 25. When installing the second fastener 2, the second fastener 2 is first positioned so that the outer end of the outer stop portion 23 is tilted against the surface of the rod 4. Then, one end of the insertion portion 22 is tilted and inserted into the fixing hole 421. At this time, the structural edge of the fixing hole 421 can be inserted into the mounting groove 25, forming a pre-position for the second fastener 2. Then, the second fastener 2 is gradually laid flat, and the remaining portion of the insertion portion 22 is inserted into the fixing hole 421. The slot direction of the mounting slot 25 provides guidance for the insertion action, ensuring that the insertion portion 22 and the fixing hole 421 are quickly aligned; and the reverse design of the limiting slot 24 and the mounting slot 25 is used to prevent the second fastener 2 from rotating or tilting when subjected to force.

[0049] See also Figure 5 The second fastener 2 can also be used to secure the blinds' draw cord 6. Specifically, the second fastener 2 includes a first cord insertion hole 26 and a second cord insertion hole 27 for securing the blinds' draw cord 6. The draw cord 6 is used to be secured to both sides of the blinds and control the blinds' flipping and opening. The first cord insertion hole 26 and the second cord insertion hole 27 longitudinally extend through the body of the second fastener 2. The blinds' draw cord 6 can pass through the first cord insertion hole 26 into the second fastener 2 and pass through the second cord insertion hole 27 out of the second fastener 2, thereby forming a connection with the second fastener 2 and securing the draw cord 6 to the rod 4.

[0050] See also Figure 6 and Figure 7To secure one end of the tape 5, the first fastener 1 further includes a first horizontal bar 13, a second horizontal bar 14, and a third horizontal bar 15. A first winding hole 16 is formed between the first horizontal bar 13 and the second horizontal bar 14, and a second winding hole 17 is formed between the second horizontal bar 14 and the third horizontal bar 15. The first winding hole 16 and the second winding hole 17 are adjacent to each other. The limiting arms 11 extend outward from both ends of the first horizontal bar 13.

[0051] See also Figure 6 and Figure 7 During installation, one end of the tape 5 is first wrapped around one side of the first fastener 1 to form an initial outer layer 51, which is in direct contact with the tape hole 21. The tape 5 is then wrapped around the outside of the first transverse strip 13 to form a first outer layer 52, which passes through the second winding hole 17 in the first direction. The tape then wraps around the second transverse strip 14 to form a first inner layer 53, which passes through the first winding hole 16 in the second direction. The tape then wraps around the first transverse strip 13 to form a second inner layer 54, which wraps around the outside of the first transverse strip 13 in the first direction and forms a third inner layer 55 on the other side of the first transverse strip 13. The tape 5 then extends from the third inner layer 55 to the side of the second transverse strip 14 to form a second outer layer 56, to the side of the third transverse strip 15 to form a fourth inner layer 57, and finally wraps around the outside of the third transverse strip 15 in the second direction and extends to the side of the first transverse strip 13 to form a third outer layer 58. The third outer layer 58 and the initial outer layer 51 are in direct contact with both sides of the tape hole 21. Through the above-mentioned multi-stage reciprocating winding, the tape 5 forms an "S"-shaped winding path between the three horizontal bars of the first fastener 1, and can simultaneously wrap around the first horizontal bar 13, the second horizontal bar 14 and the third horizontal bar 15. By utilizing the staggered layout of the horizontal bars and the tape holes 21, the contact area and friction between the tape 5 and the fastener are increased, and at the same time, the portion of the tape 5 on the first fastener 1 is thickened so that this portion can be interference fit with the tape holes 21.

[0052] Furthermore, the limiting arms 11 extend outward from both ends of the first transverse bar 13, that is, at least the first transverse bar 13 is located outside the belt-through hole 21, and the second transverse bar 14 and / or the third transverse bar 15 are located inside the belt-through hole 21. After the above-mentioned winding, the tape 5 forms a two-layer and three-layer structure on one side and the other side of the first transverse bar 13, respectively, which can increase the thickness of the portion where the first transverse bar 13 is located, and the second transverse bar 14 can also form a two-layer and three-layer structure on one side and the other side, respectively, and the positions of the two-layer and three-layer structures are opposite to those of the two-layer and three-layer structures of the first transverse bar 13, forming an "S"-shaped bending structure as a whole, and both sides of the third transverse bar 15 are single-layer structures. Therefore, the portion of the tape 5 located outside the belt-through hole 21 is thicker, and the portion of the tape 5 located inside the belt-through hole 21 is thinner, which can form a trapezoidal structure that is not easy to loosen. At the same time, since the tape 5 on the first transverse strip 13 and the tape 5 on the second transverse strip 14 form an “S”-shaped bending structure as a whole, the stability of the tape 5 in the tape hole 21 is further improved.

[0053] See also Figure 8 , an embodiment of the present invention also discloses a Venetian blind, comprising the tape connection device for Venetian blinds as described above. The tape connection device for Venetian blinds comprises a first fastener 1, a second fastener 2, a third fastener 3 and a rod 4, wherein the first fastener 1, the second fastener 2 and the third fastener 3 can fix one end of the tape 5 to the rod 4. During installation, firstly pass one end of the tape 5 through the second fastener 2 and wrap it around the first fastener 1, so that one end of the tape 5 is first fixed to the first fastener 1, and then the first fastener 1 abuts against one side of the second fastener 2 to complete the connection between the tape 5 and the second fastener 2, and finally the third fastener 3 can be connected to the second fastener 2, and the third fastener 3 is slidably connected to the rod 4, so that the second fastener 2 can be fixed to the rod 4, thereby achieving the fixation of one end of the tape 5 to the rod 4. By interconnecting the first fastener 1, the second fastener 2 and the third fastener 3, the number of turns of the tape 5 wound and tied can be reduced, and the tying operation time can be reduced. Moreover, by interconnecting the first fastener 1, the second fastener 2 and the third fastener 3, the connection strength between the tape 5 and the rod 4 can be improved, and the installation operation is simple and uncomplicated. After installation, the first fastener 1, the second fastener 2 and the third fastener 3 can also be disassembled separately, achieving better disassembly and facilitating later maintenance.

[0054] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A belt connecting device for a Venetian blind, used for hanging or fixing the belt of a Venetian blind, characterized in that: It includes a first fastener connected to the winding belt, a second fastener in contact with the first fastener, a third fastener connected to the second fastener, and a rod provided on the blind and connected to the third fastener; One end of the tape passes through the second fastener and is wound around the first fastener, and the first fastener abuts against one side of the second fastener to fix the one end of the tape in the second fastener; The third fastener is slidably connected to the rod, and the third fastener can be connected to the second fastener to fix the second fastener on the rod; The third fastener includes a folding arm, and the folding arm includes a slide bar, and the slide bar protrudes outward from both sides of the third fastener. The surface of the rod is provided with a slide groove, and the slide groove is recessed inward. The slide bar can be inserted into the slide groove and can slide in the slide groove; The rod is provided with a fixing hole, and the second fastener includes an inserting portion and an outer blocking portion, wherein the inserting portion can be inserted into the fixing hole, and the outer blocking portion can block the fixing hole; after the inserting portion is inserted into the fixing hole, the third fastener can slide to the position of the second fastener and connect with the second fastener; A limiting groove is provided between the end of the insertion portion and the end of the outer stop portion, and a limiting plate is provided on the third fastener, and the limiting plate is provided between the two folding arms. After the third fastener slides to the position of the second fastener, the limiting plate can be inserted into the limiting groove, and at this time, the folding arms surround both sides of the second fastener; The second fastener also includes a first rope threading hole and a second rope threading hole, the first rope threading hole and the second rope threading hole longitudinally pass through the main body of the second fastener, and the draw cord of the blinds can pass through the first rope threading hole into the second fastener and pass through the second rope threading hole out of the second fastener.

2. The tape connection device for blinds according to claim 1, characterized in that: The second fastener includes a belt hole, the belt hole longitudinally passes through the body of the second fastener, and one end of the belt can pass through the belt hole and be connected to the first fastener; The length of the cross section of the belt-through hole is greater than the width of the rolled belt.

3. The tape connection device for blinds according to claim 2, characterized in that: The first fastener includes a limiting arm extending from both sides. The horizontal length of the limiting arm is greater than the cross-sectional length of the belt hole. The limiting arm can abut against the side of the belt hole.

4. The tape connection device for blinds according to claim 1, characterized in that: The folding arm also includes a folding plate, which is arranged on the inner side of the folding arm and extends toward the inner side of the third fastener. After the third fastener slides to the position of the second fastener, the inner side of the folding plate can abut against the side wall of the insertion part or be located on the side of the insertion part.

5. The tape connection device for blinds according to claim 4, characterized in that: A buckle is provided on the inner side of the folding plate, and the buckle protrudes from the inner side of the folding plate toward the inner side of the third fastener. The outer surface of the buckle is arc-shaped. A slot is provided on the side of the insertion part, and the slot is recessed in the surface of the insertion part. The inner surface of the slot is arc-shaped. After the third fastener slides to the position of the second fastener, the buckle can be inserted into the slot.

6. The tape connection device for blinds according to claim 4, characterized in that: The folding arm also includes a connecting plate, which is connected between the slide bar and the folding plate. The longitudinal section of the folding plate, the connecting plate and the slide bar forms a "Z" shape. A boss is provided in the middle of the rod, and the boss protrudes from the surface of the slide groove. The fixing hole is provided on the boss, and the connecting plates on both sides of the limit plate can surround both sides of the boss.

7. The tape connection device for blinds according to claim 1, characterized in that: The third fastener also includes a convex plate, which is arranged on the edge of the third fastener and protrudes from the surface of the limiting plate. After the limiting plate is inserted into the limiting groove, the edge of the outer blocking portion can abut against the edge of the convex plate.

8. The tape connection device for blinds according to claim 1, characterized in that: An installation groove is also provided between the end of the insertion part and the end of the outer blocking part. The installation groove is provided at the end of the second fastener away from the limiting groove. The slot direction of the installation groove is opposite to the slot direction of the limiting groove. The structural edge of the fixing hole can be inserted into the installation groove.

9. The tape connection device for blinds according to claim 1, characterized in that: The first fastener also includes a first horizontal bar, a second horizontal bar and a third horizontal bar. A first winding hole is formed between the first horizontal bar and the second horizontal bar, and a second winding hole is formed between the second horizontal bar and the third horizontal bar. The first winding hole and the second winding hole are adjacent to each other.

10. The tape connection device for blinds according to claim 9, characterized in that: One end of the tape is first wrapped around one side of the first fastener to form an initial outer layer, and then wrapped from the initial outer layer around the outer side of the first horizontal strip to form a first outer layer and pass through the second winding hole in the first direction, then wrap around the second horizontal strip to form a first inner layer and pass through the first winding hole in the second direction, then wrap around the first horizontal strip to form a second inner layer and wrap around the outer side of the first horizontal strip in the first direction to form a third inner layer on the other side of the first horizontal strip, the tape extends from the third inner layer to the side of the second horizontal strip to form a second outer layer, extends to the side of the third horizontal strip to form a fourth inner layer, and finally wraps around the outer side of the third horizontal strip in the second direction and extends to the side of the first horizontal strip to form a third outer layer.

11. A Venetian blind, characterized in that: The invention comprises a roll-up belt connection device for a Venetian blind according to any one of claims 1 to 10.

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