Venetian blind and ladder tape mechanism thereof

Abstract

Embodiments of the present application provide a Venetian blind and a ladder tape mechanism thereof. The ladder tape mechanism comprises: a base, fixed on a headrail of the Venetian blind; a ladder tape winding drum, pivotably disposed on the base; a ladder tape, a top end of which is wound on the ladder tape winding drum, and a bottom end of which extends downwards from the headrail and is sequentially connected to slats of the Venetian blind; a drive shaft, passing through the ladder tape winding drum along a central axis of the ladder tape winding drum and circumferentially fixed to the ladder tape winding drum; a power member, disposed at one end of the drive shaft, and used to drive the drive shaft and the ladder tape winding drum to rotate synchronously, such that the ladder tape moves accordingly to drive the slats to rotate by a corresponding angle; and a limiting assembly, the limiting assembly comprising a rotating arm and a stop block, the rotating arm being disposed on the drive shaft to rotate synchronously with the drive shaft, and the stop block being fixedly assembled relative to the headrail in a rotation path of the rotating arm to limit a rotation angle range of the rotating arm. The embodiments avoid an excessive rotation angle of the slats and reduce wear of a pull cord caused by the slats.

Description

Venetian blinds and their ladder mechanism Technical Field

[0001] This application relates to the field of curtain accessories technology, and in particular to a Venetian blind and its ladder mechanism. Background Technology

[0002] Venetian blinds typically include several parallel slats with cord holes, a lower beam below the slats, an angle adjustment mechanism above the slats and connected to them for adjusting the slat angle, a pull cord whose bottom end passes through the cord holes of each slat and is fixed to the lower beam to support the slats and lower beam and drive the slats and lower beam to rise and fall, and a cord retraction mechanism above the slats and connected to the top of the pull cord for retracting and extending the pull cord; the angle adjustment mechanism includes a base, a ladder belt winding cylinder pivotally mounted on the base, a power component for driving the ladder belt winding cylinder to rotate, and a ladder belt whose top end is wound around the ladder belt winding cylinder and whose bottom end is connected to each slat, causing the slats to rotate by a corresponding angle when rotating with the ladder belt winding cylinder.

[0003] However, the inventors discovered in practice that since the slats are usually made of rigid materials (such as rigid plastic or metal), when the ladder belt winding drum drives the slats to rotate at too large an angle, the periphery of the cord hole will usually have a large friction with the cord, thus wearing down the cord. In the long-term use of Venetian blinds, this can even cause the cord to wear out and break, affecting the normal use of Venetian blinds. Technical issues

[0004] The technical problem to be solved by the embodiments of this application is to provide a ladder belt mechanism for Venetian blinds, so as to avoid excessive rotation angle of the blind slats and reduce wear on the pull cord.

[0005] A further technical problem to be solved by the embodiments of this application is to provide a Venetian blind that avoids excessive rotation angle of the blind slats and reduces wear on the pull cord. Solution

[0006] To address the aforementioned technical problems, this application provides the following technical solution: a ladder mechanism for a Venetian blind, comprising:

[0007] The base is fixed to the top beam of the Venetian blinds;

[0008] A ladder-belt winding cylinder pivotally mounted on the base;

[0009] The ladder belt has its top end wound around the ladder belt winding cylinder and its bottom end extending downward from the top beam and connected in sequence to each slat of the Venetian blind;

[0010] A drive shaft that passes through the ladder belt winding cylinder along the central axis of the ladder belt winding cylinder and is circumferentially fixed to the ladder belt winding cylinder;

[0011] A power component disposed at one end of the drive shaft for driving the drive shaft and the ladder belt winding drum to rotate synchronously, so that the ladder belt moves accordingly and drives the curtain slats to rotate by a corresponding angle; and

[0012] Limiting component, the limiting component includes:

[0013] A rotating arm mounted on the drive shaft and rotating synchronously with the drive shaft; and

[0014] A stop block that is fixedly assembled relative to the upper beam on the rotation path of the swing arm to limit the rotation angle range of the swing arm.

[0015] Furthermore, the rotating arm and the ladder belt winding cylinder are integrally formed.

[0016] Furthermore, the two opposite ends of the ladder belt winding cylinder respectively protrude to form pivot pipes, and the base is provided with pivot grooves for pivoting the pivot pipes. At least one of the pivot pipes has an integrally formed rotating arm at its end.

[0017] Furthermore, the rotating arm is fixedly assembled onto the drive shaft.

[0018] Furthermore, the end of the rotating arm that abuts against the stop block forms a bevel or a convex arc surface.

[0019] Furthermore, a stop is provided in the rotation path of the rotating arm.

[0020] Furthermore, the rotation path of the rotating arm is provided with two stops that respectively define the extreme positions of the rotating arm in different rotation directions.

[0021] Furthermore, the stop block is fixed to the base or the mounting seat of the slat lifting mechanism of the Venetian blind, or the stop block is directly fixed to the upper beam.

[0022] On the other hand, in order to solve the above-mentioned further technical problems, the embodiments of this application provide the following technical solution: a Venetian blind, comprising:

[0023] Parallel upper and lower beams;

[0024] A number of curtain slats are arranged parallel to the upper beam between the upper beam and the lower beam;

[0025] A ladder belt mechanism for adjusting the angle of the curtain slats, mounted on the upper beam and connected to the curtain slats; and

[0026] A curtain slat lifting mechanism, mounted on the upper beam and connected to the lower beam, for driving the lower beam and the curtain slats to rise and fall.

[0027] The ladder belt mechanism is any one of the ladder belt mechanisms described above.

[0028] Furthermore, the curtain slat lifting mechanism includes:

[0029] Mounting bracket fixed to the upper beam;

[0030] A rope winding drum pivotally mounted on the mounting base;

[0031] A pull cord, with its top end wound around the rope-winding cylinder and its bottom end extending downwards from the upper beam and passing sequentially through the pre-set rope-threading holes on each of the curtain slats, is then fixed to the lower beam; and

[0032] A lifting power assembly that is connected to the rope winding drum to drive the rope winding drum to rotate and retract the pull rope to drive the lower beam and the curtain slats to rise and fall. Beneficial effects

[0033] After adopting the above technical solution, the embodiments of this application have at least the following beneficial effects: The ladder belt mechanism of the Venetian blinds in the embodiments of this application is equipped with a limiting component. By setting a rotating arm that rotates synchronously with the drive shaft on the drive shaft of the ladder belt mechanism, and setting a stop block that is fixed relative to the upper beam in the rotation path of the rotating arm, the stop block is used to stop and limit the rotating arm when it rotates to a predetermined angle, so that the drive shaft can no longer rotate. This can effectively prevent the ladder belt winding drum from driving the curtain slats to rotate at a large angle through the ladder belt, thereby reducing the wear of the cord hole periphery of the curtain slats on the pull cord and improving the service life. Attached Figure Description

[0034] Figure 1 is a schematic diagram of the split structure of an optional embodiment of the ladder belt mechanism of the Venetian blinds of this application.

[0035] Figure 2 is a schematic diagram of the disassembled structure of the stop block assembled on the mounting base in an optional embodiment of the ladder belt mechanism of the Venetian blind of this application.

[0036] Figure 3 is a schematic diagram of the disassembled structure of the stop block assembled on the base in an optional embodiment of the ladder belt mechanism of the Venetian blind of this application.

[0037] Figure 4 is a schematic diagram of the disassembled structure of the ladder belt mechanism of the venetian blind of this application, showing the block assembly on the upper beam.

[0038] Figure 5 is a cross-sectional schematic diagram of an optional embodiment of the ladder mechanism of the Venetian blind of this application, showing the swing arm abutting against the stop.

[0039] Figure 6 is a schematic diagram of the mounting base of an optional embodiment of the ladder belt mechanism of the venetian blind of this application.

[0040] Figure 7 is a schematic diagram of the split structure of an optional embodiment of the Venetian blinds of this application.

[0041] Figure 8 is a schematic diagram of the assembly structure of an optional embodiment of the Venetian blinds of this application. Embodiments of the present invention

[0042] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative 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 can be combined with each other unless otherwise specified.

[0043] As shown in Figures 1-5, one optional embodiment of this application provides a ladder belt mechanism 1 for a Venetian blind, comprising:

[0044] The base 10 is fixed to the upper beam 3 of the Venetian blind;

[0045] A ladder belt winding cylinder 12 is pivotally mounted on the base 10;

[0046] The top end of the ladder belt 13 is wound around the ladder belt winding cylinder 12, and the bottom end extends downward from the upper beam 3 and is connected in sequence to each slat 5 of the Venetian blind.

[0047] A drive shaft 14 passes through the ladder belt winding cylinder 12 along the central axis of the ladder belt winding cylinder 12 and is circumferentially fixed to the ladder belt winding cylinder 12;

[0048] A power component 16, located at one end of the drive shaft 14, is used to drive the drive shaft 14 and the ladder belt winding drum 12 to rotate synchronously, so that the ladder belt 13 moves accordingly, thereby causing the curtain slats 5 to rotate by a corresponding angle; and

[0049] Limiting component 18, the limiting component 18 comprising:

[0050] A rotating arm 181 mounted on the drive shaft 14 and rotating synchronously with the drive shaft 14; and

[0051] A stop 183 is fixedly assembled relative to the upper beam 3 on the rotation path of the rotating arm 181 to limit the rotation angle range of the rotating arm 181.

[0052] In this embodiment of the Venetian blind, a limiting component 18 is added to the ladder belt mechanism 1. A rotating arm 181 that rotates synchronously with the drive shaft 14 is set on the drive shaft 14 of the ladder belt mechanism 1. At the same time, a stop block 183 that is fixed relative to the upper beam 3 is set in the rotation path of the rotating arm 181. When the rotating arm 181 rotates to a predetermined angle, the stop block 183 stops and limits the rotating arm 181, and the drive shaft 14 can no longer rotate. This can effectively prevent the ladder belt winding drum 12 from driving the curtain slat 5 to rotate at a large angle through the ladder belt 13, thereby reducing the wear of the cord hole 50 of the curtain slat 5 on the pull cord 94 and improving the service life.

[0053] Specifically, as shown in Figure 1, the power component 16 consists of a gear frequency tuner 161 disposed at one end of the transmission shaft 14 and an operating lever 163 connected to the gear frequency tuner 161.

[0054] In an optional embodiment of this application, as shown in Figures 2 to 5, the rotating arm 181 and the ladder belt winding drum 12 are integrally formed. In this embodiment, the rotating arm 181 and the ladder belt winding drum 12 are directly integrally formed, which facilitates manufacturing and assembly. Moreover, the ladder belt winding drum 12 rotates synchronously with the drive shaft 14 under the drive of the drive shaft 14, thereby ensuring that the rotating arm 181 can also rotate synchronously with the drive shaft 14.

[0055] In an optional embodiment of this application, as shown in Figures 2-5, pivot tubes 121 protrude from opposite ends of the ladder belt winding cylinder 12, and the base 10 is provided with pivot grooves 101 for pivoting the pivot tubes 121. At least one pivot tube 121 has a rotating arm 181 integrally formed at its end or is fixedly assembled thereon. In this embodiment, by providing pivot tubes 121 at both ends of the ladder belt winding cylinder 12 and a rotating arm 181 at its end, the rotating arm 181 can be integrally formed with the pivot tube 121, for example, by injection molding, or it can be a separately manufactured component that is fixed to the ladder belt winding cylinder 12 during product assembly. Through the synchronous transmission of the ladder belt winding cylinder 12, the rotating arm 181 can always rotate synchronously with the transmission shaft 14. In practical implementation, a rotating arm 181 can be provided on each of the pivot tubes 121 at both ends of the ladder belt winding cylinder 12, so that it is convenient to assemble without having to distinguish the orientation of the ladder belt winding cylinder 12. The base 10 can be composed of a base 103 and a limiting cover 105 that is fastened on the base 103, and the pivot groove 101 is formed on the base 103.

[0056] In one optional embodiment of this application, the rotating arm 181 is fixedly assembled onto the drive shaft 14. In this embodiment, the rotating arm 181 is directly fixedly assembled onto the drive shaft 14 without modifying the structure of the existing ladder belt mechanism, which is more conducive to upgrading the existing ladder belt mechanism and has a lower implementation cost.

[0057] In an optional embodiment of this application, as shown in Figures 2 and 4, the end of the rotating arm 181, where it abuts against the stop block 183, forms an inclined surface 181a that conforms to the corresponding surface of the stop block 183. In this embodiment, the inclined surface 181a at the end of the rotating arm 181 further enhances the contact area with the stop block 183, resulting in a better stopping effect, reduced wear, extended service life, and reliable angle control accuracy even after long-term use.

[0058] In an optional embodiment of this application, as shown in Figures 2-5, a stop 183 is provided in the rotation path of the rotating arm 181. Although this embodiment only provides one stop 183, existing Venetian blinds usually have two sets of ladder belt mechanisms 1 symmetrically arranged. The limiting components 18 in the two sets of ladder belt mechanisms 1 can limit the rotation limit angle position of the rotating arm 181 in different directions, thereby still effectively limiting the limit angle position in both directions and achieving the angle limiting effect.

[0059] In an optional embodiment of this application, as shown in FIG6, two stops 183 are provided in the rotation path of the rotating arm 181 to respectively limit the extreme positions of the rotating arm 181 in different rotation directions. In this embodiment, by providing two stops 183 in the rotation path of the rotating arm 181 to respectively limit the extreme positions of the rotating arm 181 in different rotation directions, the two stops 183 of a limiting component 18 can limit the two extreme angular positions of the rotating arm 181 during bidirectional rotation, thus achieving angular limiting.

[0060] In one optional embodiment of this application, the stop block 183 is fixed to the base 10 (as shown in Figure 3) or to the mounting base 90 of the slat lifting mechanism 9 of the Venetian blind (as shown in Figures 1-2, 5-7), or the stop block 183 is directly fixed to the upper beam 3 (as shown in Figure 4). This embodiment provides multiple positions where the stop block 183 can be set, allowing for flexible design of the stop block 183's position according to different design requirements in practical applications. In practical implementation, for ease of manufacturing and assembly, it is preferable to set the stop 183 on the mounting base 90 of the curtain lifting mechanism 9. Conventional Venetian blinds usually have a set of ladder belt mechanisms 1 symmetrically set near both ends. The curtain lifting mechanism 9 also has two mounting bases 90 symmetrically set to each pivot a rope winding cylinder 92. The mounting bases 90 can be produced using the same mold. During assembly, only one of the mounting bases 90 needs to be rotated 180 degrees. Thus, even if only one stop 183 is set on the mounting base 90, the rotation limit angle position of the rotating arm 181 can be limited in both directions, and the production mold cost is also reduced.

[0061] On the other hand, as shown in Figures 7-8, another embodiment of this application also provides a Venetian blind, including:

[0062] The upper beam 3 and the lower beam 7 are set in parallel.

[0063] Several curtain slats 5 are arranged parallel to the upper beam 3 between the upper beam 3 and the lower beam 7;

[0064] A ladder belt mechanism 1, which is mounted on the upper beam 3 and connected to the curtain slats 5, and is used to adjust the angle of the curtain slats 5; and

[0065] A curtain lifting mechanism 9, mounted on the upper beam 3 and connected to the lower beam 7, is used to drive the lower beam 7 and the curtain slats 5 to rise and fall. The ladder belt mechanism 1 is the ladder belt mechanism described in any of the above embodiments. In this embodiment, the Venetian blinds adopt the ladder belt mechanism 1 described in any of the aforementioned embodiments, which can effectively prevent the curtain slats 5 from rotating too much and reduce the wear of the curtain slats on the pull cord 94.

[0066] In an optional embodiment of this application, as shown in Figures 1-5 and 7, the curtain slat lifting mechanism 9 includes:

[0067] Mounting seat 90 fixed on the upper beam 3;

[0068] A rope winding cylinder 92 is pivotally mounted on the mounting base 90;

[0069] A pull rope 94, with its top end wound around the rope cylinder 92 and its bottom end extending downward from the upper beam 3 and passing through the pre-set rope holes 50 on each of the curtain slats 5, is then fixed to the lower beam 7; and

[0070] A lifting power assembly 96 is connected to the winding drum 92 to drive the winding drum 92 to rotate and retract the pull rope 94 to drive the lower beam 7 and the curtain slats 5 to rise and fall.

[0071] In this embodiment, the curtain slat lifting mechanism 9 drives the rope drum 92 to rotate via the lifting power assembly 96. The rotation of the rope drum 92 on the mounting base 90 then enables the raising and lowering of the pull rope 94. The pull rope 94 drives the lower beam 7 to rise and fall, thereby effectively controlling the raising and lowering movement of each curtain slat 5. Specifically, the lifting power assembly 96 includes a spring driver 961 fixedly assembled to the upper beam 3 and a central shaft 963 with one end coaxially connected to the output shaft of the spring driver 961.

[0072] In specific implementation, as shown in Figure 1, Venetian blinds are usually provided with a set of ladder belt mechanism 1, a pull cord 94, a mounting base 90, and a cord winding tube 92 on both sides. Correspondingly, each ladder belt mechanism 1 is provided with a limiting component 18.

[0073] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of this application.

Claims

1. A ladder mechanism for a Venetian blind, comprising: The base is fixed to the top beam of the Venetian blinds; A ladder-belt winding cylinder pivotally mounted on the base; The ladder belt has its top end wound around the ladder belt winding cylinder and its bottom end extending downward from the top beam and connected in sequence to each slat of the Venetian blind; A drive shaft that passes through the ladder belt winding cylinder along the central axis of the ladder belt winding cylinder and is circumferentially fixed to the ladder belt winding cylinder; as well as A power component located at one end of the drive shaft to drive the drive shaft and the ladder belt winding drum to rotate synchronously, so that the ladder belt moves accordingly and drives the curtain slats to rotate by a corresponding angle. The ladder belt mechanism is characterized in that it further includes a limiting component, the limiting component comprising: A rotating arm mounted on the drive shaft and rotating synchronously with the drive shaft; and A stop block that is fixedly assembled relative to the upper beam on the rotation path of the swing arm to limit the rotation angle range of the swing arm.

2. The ladder mechanism of the Venetian blind as described in claim 1, characterized in that, The rotating arm and the ladder belt winding cylinder are integrally formed.

3. The ladder mechanism of the Venetian blind as described in claim 1, characterized in that, The two ends of the ladder belt winding cylinder respectively protrude to form pivot pipes, and the base is provided with pivot grooves for pivoting the pivot pipes. At least one of the pivot pipes has an integrally formed rotating arm or a fixedly assembled rotating arm at its end.

4. The ladder mechanism of the Venetian blind as described in claim 1, characterized in that, The rotating arm is fixedly assembled on the drive shaft.

5. The ladder mechanism of the Venetian blind as described in claim 1, characterized in that, The end of the rotating arm, where it abuts against the stop block, forms an inclined surface that fits and abuts against the corresponding surface of the stop block.

6. The ladder mechanism of the Venetian blind as described in claim 1, characterized in that, A stop is provided in the rotation path of the rotating arm.

7. The ladder mechanism of the Venetian blind as described in claim 1, characterized in that, The rotation path of the rotating arm is provided with two stops that respectively limit the extreme positions of the rotating arm in different rotation directions.

8. The ladder mechanism of the Venetian blind as described in any one of claims 1-7, characterized in that, The stop block is fixed to the base or the mounting seat of the slat lifting mechanism of the Venetian blind, or the stop block is directly fixed to the upper beam.

9. A Venetian blind, comprising: Parallel upper and lower beams; A number of curtain slats are arranged parallel to the upper beam between the upper beam and the lower beam; A ladder belt mechanism for adjusting the angle of the curtain slats, mounted on the upper beam and connected to the curtain slats; and A curtain slat lifting mechanism, mounted on the upper beam and connected to the lower beam, for driving the lower beam and the curtain slats to rise and fall. The ladder belt mechanism is characterized in that it is the ladder belt mechanism according to any one of claims 1-8.

10. The Venetian blind as described in claim 9, characterized in that, The curtain lifting mechanism includes: Mounting bracket fixed to the upper beam; A rope winding drum pivotally mounted on the mounting base; A pull cord, with its top end wound around the rope-winding cylinder and its bottom end extending downwards from the upper beam and passing sequentially through the pre-set rope-threading holes on each of the curtain slats, is then fixed to the lower beam; and A lifting power assembly that is connected to the rope winding drum to drive the rope winding drum to rotate and retract the pull rope to drive the lower beam and the curtain slats to rise and fall.

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