Venetian blind and ladder belt mechanism thereof

Abstract

The embodiment of the utility model provides a venetian blind and a ladder belt mechanism thereof, and the ladder belt mechanism comprises a base which is fixed on an upper beam of the venetian blind; the ladder belt winding drum is pivoted on the base; the top end of the ladder belt is wound on the ladder belt winding drum, the bottom end of the ladder belt extends downwards from the upper beam, and the ladder belt is sequentially connected with the slats of the venetian blind; the transmission shaft penetrates through the ladder belt winding drum along the central axis of the ladder belt winding drum and is fixed to the ladder belt winding drum in the circumferential direction; the power part is arranged at one end of the transmission shaft and is used for driving the transmission shaft and the ladder belt winding drum to synchronously rotate to enable the ladder belts to correspondingly move to drive the curtain sheets to rotate by corresponding angles; the limiting assembly comprises a rotating arm which is arranged on the transmission shaft and synchronously rotates along with the transmission shaft; the check block and the upper beam are relatively fixedly assembled on the rotating path of the rotating arm so as to limit the rotating angle range of the rotating arm. The rotating angle of the curtain pieces is prevented from being too large, and abrasion of the curtain pieces to the pull ropes is reduced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of curtain accessories, and in particular to a Venetian blind curtain and a ladder belt mechanism thereof. Background Art

[0002] The venetian blinds usually include a plurality of curtain pieces arranged in parallel and provided with rope holes, a lower beam arranged below the curtain pieces, an angle adjustment mechanism arranged above the curtain pieces and connected to the curtain pieces for adjusting the angle of the curtain pieces, a pull rope whose bottom end passes through the rope holes of each curtain piece in turn and is fixed to the lower beam for supporting the curtain piece and the lower beam and driving the curtain piece and the lower beam to rise and fall, and a rope retraction mechanism arranged above the curtain piece and connected to the top of the pull rope for retracting and releasing the pull rope; the angle adjustment mechanism includes a base, a ladder belt winding drum pivotally arranged on the base, a power assembly for driving the ladder belt winding drum to rotate, and a ladder belt whose top end is wound around the ladder belt winding drum and whose bottom end is connected to each curtain piece, and drives the curtain piece to rotate a corresponding angle when the ladder belt winding drum rotates.

[0003] However, the inventors discovered during the actual implementation that since the curtain slats are usually made of hard materials (for example, hard plastic or metal), when the ladder belt winding drum drives the curtain slats to rotate too much through the ladder belt, the periphery of the rope hole will usually cause greater friction with the draw cord, thereby wearing the draw cord. During the long-term use of the blinds, the draw cord may even wear and break, affecting the normal use of the blinds. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the present utility model is to provide a ladder belt mechanism for a Venetian blind, which can prevent the blinds from rotating at an excessively large angle and reduce the wear of the blinds on the pull cords.

[0005] A further technical problem to be solved by the embodiments of the present invention is to provide a Venetian blind that prevents the blinds from rotating at excessive angles and reduces wear on the pull cords caused by the blinds.

[0006] In order to solve the above technical problems, the embodiment of the present invention provides the following technical solutions: a ladder belt mechanism for a venetian blind, comprising:

[0007] The base is fixed on the upper beam of the blinds;

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

[0009] A ladder belt with a top end wound on the ladder belt winding drum and a bottom end extending downward from the upper beam and connected to each curtain piece of the blind in sequence;

[0010] a transmission shaft passing through the ladder belt winding drum along the central axis of the ladder belt winding drum and circumferentially fixed to the ladder belt winding drum;

[0011] A power member provided at one end of the transmission shaft for driving the transmission shaft and the ladder belt winding drum to rotate synchronously so that the ladder belt moves accordingly and drives the curtain sheet to rotate a corresponding angle; and

[0012] A limit assembly, the limit assembly comprising:

[0013] A rotating arm provided on the transmission shaft and rotating synchronously with the transmission shaft; and

[0014] A stopper is fixedly assembled relative to the upper beam on the rotation path of the rotating arm to limit the rotation angle range of the rotating arm.

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

[0016] Furthermore, the opposite ends of the ladder belt winding drum are respectively protruded to form a pivot tube, and the base is correspondingly provided with a pivot groove for the pivot tube to be pivoted, and the rotating arm is integrally formed at the end of at least one of the pivot tubes.

[0017] Furthermore, the rotating arm is fixedly assembled on the transmission shaft.

[0018] Furthermore, the end of the rotating arm is used to form an inclined surface or a convex arc surface at a position where the end of the rotating arm abuts against the stopper.

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

[0020] Furthermore, two stoppers are provided in the rotation path of the rotating arm, which respectively limit the extreme positions of the rotating arm in different rotation directions.

[0021] Furthermore, the stopper is fixed on the base or on a mounting seat of the slat lifting mechanism of the Venetian blind, or the stopper is directly fixed on the upper beam.

[0022] On the other hand, in order to solve the above-mentioned further technical problems, the embodiment of the present invention provides the following technical solutions: a venetian blind, comprising:

[0023] Upper and lower beams arranged in parallel;

[0024] a plurality of curtain blades arranged between the upper beam and the lower beam in parallel with the upper beam;

[0025] a ladder belt mechanism provided on the upper beam and connected to the curtain pieces, and used for adjusting the angle of the curtain pieces; and

[0026] A curtain slat lifting mechanism is provided on the upper beam and connected to the lower beam, and is used to drive 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] a mounting base fixed on the upper beam;

[0030] a rope winding drum pivotally mounted on the mounting seat;

[0031] A pull rope, the top end of which is wound around the rope drum and the bottom end of which extends downward from the upper beam and passes through the rope holes preset on each of the curtain pieces in sequence and is then fixed to the lower beam; and

[0032] A lifting power component is connected to the rope drum to drive the rope drum to rotate and retract the pull rope to drive the lower beam and the curtain sheet to move up and down.

[0033] After adopting the above technical solution, the embodiment of the present invention has at least the following beneficial effects: a limiting component is added to the ladder belt mechanism of the blind curtain in the embodiment of the present invention, by providing a rotating arm that rotates synchronously with the transmission shaft on the transmission shaft of the ladder belt mechanism, and at the same time providing a stopper fixed relatively to the upper beam in the rotation path of the rotating arm, and utilizing the stopper to stop and limit the rotating arm when the rotating arm rotates to a predetermined angle, so that the transmission shaft cannot continue to rotate, which can effectively prevent the ladder belt winding drum from driving the curtain piece to rotate at a large angle through the ladder belt, thereby reducing the wear of the pull rope on the periphery of the rope threading hole of the curtain piece and improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the disassembled structure of an optional embodiment of the ladder belt mechanism of the Venetian blinds of the present invention.

[0035] Figure 2 This is a schematic diagram of the disassembled structure of an optional embodiment of the ladder belt mechanism of the Venetian blinds of the present invention, in which a stopper is assembled on a mounting base.

[0036] Figure 3 This is a schematic diagram of the disassembled structure of an optional embodiment of the ladder belt mechanism of the Venetian blinds of the present invention, in which a stopper is assembled on a base.

[0037] Figure 4 This is a schematic diagram of the disassembled structure of an optional embodiment of the ladder belt mechanism of the blinds of the present invention, in which the stopper is assembled on the upper beam.

[0038] Figure 5 This is a cross-sectional schematic diagram of an optional embodiment of the ladder belt mechanism of the Venetian blind, showing the abutment between the rotating arm and the stop portion.

[0039] Figure 6This is a structural schematic diagram of a mounting base of an optional embodiment of the ladder belt mechanism of the Venetian blinds of the present invention.

[0040] Figure 7 The figure is a schematic diagram of the disassembled structure of an optional embodiment of the venetian blind of the present invention.

[0041] Figure 8 The figure is a schematic diagram of the assembly structure of an optional embodiment of the venetian blind of the present invention. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0043] like Figure 1-Figure 5 As shown, an optional embodiment of the present invention provides a ladder belt mechanism 1 for a Venetian blind, comprising:

[0044] The base 10 is fixed on the upper beam 3 of the blinds;

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

[0046] A ladder belt 13 having a top end wound on the ladder belt winding drum 12 and a bottom end extending downward from the upper beam 3 and connected to each slat 5 of the Venetian blind in sequence;

[0047] a transmission shaft 14 passing through the ladder belt winding drum 12 along the central axis of the ladder belt winding drum 12 and circumferentially fixed to the ladder belt winding drum 12;

[0048] a power member 16 disposed at one end of the transmission shaft 14 for driving the transmission shaft 14 and the ladder belt winding drum 12 to rotate synchronously so that the ladder belt 13 moves accordingly and drives the curtain piece 5 to rotate a corresponding angle; and

[0049] The limiting assembly 18 includes:

[0050] A rotating arm 181 disposed on the transmission shaft 14 and rotating synchronously with the transmission shaft 14; and

[0051] A stopper 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 the embodiment of the utility model, a limit assembly 18 is added to the ladder belt mechanism 1 of the blind curtain. By providing a rotating arm 181 on the transmission shaft 14 of the ladder belt mechanism 1 and rotating synchronously with the transmission shaft 14, a stopper 183 fixed relatively to the upper beam 3 is provided in the rotation path of the rotating arm 181. The stopper 183 is used to stop and limit the rotating arm 181 when the rotating arm 181 rotates to a predetermined angle, and then the transmission shaft 14 cannot continue to rotate. This can effectively prevent the ladder belt winding drum 12 from driving the curtain piece 5 through the ladder belt 13 to rotate at a large angle, thereby reducing the wear of the rope threading hole 50 of the curtain piece 5 on the pull rope 94 and improving the service life.

[0053] Specifically, such as Figure 1 As shown, the power member 16 is composed of a gear frequency regulator 161 provided at one end of the transmission shaft 14 and an operating rod 163 connected to the gear frequency regulator 161 .

[0054] In an optional embodiment of the present invention, Figures 2 to 5 As shown, the rotating arm 181 is integrally formed with the ladder belt winding drum 12. In this embodiment, the rotating arm 181 is directly integrally formed with the ladder belt winding drum 12, which facilitates manufacturing and assembly. Furthermore, the ladder belt winding drum 12 rotates synchronously with the transmission shaft 14 when driven by the transmission shaft 14, thereby ensuring that the rotating arm 181 can also rotate synchronously with the transmission shaft 14.

[0055] In an optional embodiment of the present invention, Figure 2-Figure 5 As shown, the opposite ends of the ladder belt winding drum 12 are respectively protruded to form pivot tubes 121, and the base 10 is correspondingly provided with a pivot slot 101 for the pivot tube 121 to be pivoted. At the end of at least one of the pivot tubes 121, the pivot arm 181 is integrally formed or fixedly assembled. In this embodiment, by providing the pivot tubes 121 at both ends of the ladder belt winding drum 12 and the pivot arm 181 at the end of the pivot tube 121, the pivot arm 181 can be integrally formed with the pivot tube 121, such as by integral injection molding, or it can be an independently manufactured component and then fixed to the ladder belt winding drum 12 during product assembly. Through the synchronous transmission of the ladder belt winding drum 12, the pivot arm 181 can always rotate synchronously with the transmission shaft 14. In a specific implementation, a rotating arm 181 can be provided on each of the pivot tubes 121 at both ends of the ladder belt winding drum 12, thereby facilitating assembly without having to specifically distinguish the orientation of the ladder belt winding drum 12. The base 10 can be composed of a base 103 and a limiting cover 105 that buckles onto the base 103, and the pivot groove 101 is formed on the base 103.

[0056] In an optional embodiment of the present invention, the rotating arm 181 is fixedly assembled on the transmission shaft 14. In this embodiment, the rotating arm 18 is directly fixedly assembled on the transmission shaft 14 without modifying the structure of the existing ladder belt mechanism, which is more conducive to directly utilizing the existing ladder belt mechanism for upgrading and has lower implementation costs.

[0057] In an optional embodiment of the present invention, Figure 2 and Figure 4 As shown, the end of the rotating arm 181 is formed with an inclined surface 181a at the portion thereof that abuts the stopper 183, which is in contact with the corresponding surface of the stopper 183. In this embodiment, the inclined surface 181a is formed at the end of the rotating arm 181 to abut against the stopper 183, thereby increasing the contact area between the two and improving the stopping effect. This also helps to reduce wear and extend the service life. Even after long-term use, reliable angle control accuracy is still maintained.

[0058] In an optional embodiment of the present invention, Figure 2-Figure 5 As shown, a stopper 183 is provided in the rotation path of the rotating arm 181. Although only one stopper 183 is provided in this embodiment, conventional Venetian blinds typically have two symmetrical sets of ladder belt mechanisms 1. The limiting assemblies 18 in the two sets of ladder belt mechanisms 1 can each limit the rotational angular position of the rotating arm 181 in different directions, thereby effectively limiting the angular position in both directions and achieving an angular limiting effect.

[0059] In an optional embodiment of the present invention, Figure 6 As shown, 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 single limiting assembly 18 define the two extreme angular positions of the rotating arm 181 during bidirectional rotation, thereby also achieving angular limiting.

[0060] In an optional embodiment of the present invention, the stopper 183 is fixed on the base 10 (eg Figure 3 As shown,) or the mounting seat 90 of the slat lifting mechanism 9 of the Venetian blind (as shown Figure 1-Figure 2 、 Figure 5-Figure 7 As shown), or the stopper 183 is directly fixed on the upper beam 3 (as shown Figure 4As shown). This embodiment provides multiple locations where the stopper 183 can be set. In actual application, the location of the stopper 183 can be flexibly designed according to different design requirements. In specific implementation, for ease of manufacturing and assembly, it is preferred that the stopper 183 be set on the mounting seat 90 of the curtain slat lifting mechanism 9. Conventional-sized Venetian blinds usually have a set of ladder belt mechanisms 1 symmetrically arranged near both ends. The curtain slat lifting mechanism 9 is also symmetrically provided with two mounting seats 90, each pivotally provided with a rope drum 92. The mounting seats 90 can be produced using the same mold. During assembly, only one of the mounting seats 90 needs to be rotated 180 degrees. Therefore, even if only one stopper 183 is provided on the mounting seat 90, the rotational 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, Figure 7-Figure 8 As shown, another embodiment of the present invention further provides a venetian blind, comprising:

[0062] Upper beam 3 and lower beam 7 arranged in parallel;

[0063] A plurality of curtain panels 5 arranged between the upper beam 3 and the lower beam 7 in parallel with the upper beam 3;

[0064] a ladder belt mechanism 1 provided on the upper beam 3 and connected to the curtain slats 5 and used for adjusting the angle of the curtain slats 5; and

[0065] The slat lifting mechanism 9 is mounted on the upper beam 3 and connected to the lower beam 7, and is used to drive the lower beam 7 and the slats 5 up and down. The ladder belt mechanism 1 can be any of the ladder belt mechanisms described in the aforementioned embodiments. In this embodiment, the Venetian blind employs the ladder belt mechanism 1 described in any of the aforementioned embodiments, effectively preventing the slats 5 from rotating excessively, thereby reducing wear on the pull cord 94 caused by the slats.

[0066] In an optional embodiment of the present invention, Figure 1-Figure 5 and Figure 7 As shown, the curtain blade lifting mechanism 9 includes:

[0067] A mounting base 90 fixed to the upper beam 3;

[0068] a rope drum 92 pivotally mounted on the mounting base 90;

[0069] A pull rope 94 having a top end wound around the rope drum 92 and a bottom end extending downward from the upper beam 3 and sequentially passing through the rope holes 50 preset on each of the curtain panels 5 and then fixed to the lower beam 7; and

[0070] A lifting power assembly 96 is connected to the rope drum 92 to drive the rope drum 92 to rotate and retract the pull rope 94 to drive the lower beam 7 and the curtain sheet 5 to move up and down.

[0071] In this embodiment, the curtain slat lifting mechanism 9 drives the rope drum 92 to rotate via a lifting power assembly 96. This, in turn, allows the rope drum 92 to rotate on the mounting base 90, thereby retracting and extending the pull rope 94. The pull rope 94 then drives the lower beam 7 up and down, effectively raising and lowering each curtain slat 5. Specifically, the lifting power assembly 96 includes a spring driver 961 fixedly assembled to the upper beam 3 and a rotating shaft 963, one end of which is coaxially connected to the output shaft of the spring driver 961.

[0072] In specific implementation, Figure 1 As shown, a Venetian blind is usually provided with a set of ladder belt mechanisms 1, a pull rope 94, a mounting seat 90 and a rope drum 92 on both sides. Correspondingly, each of the ladder belt mechanisms 1 is provided with a corresponding limiting component 18.

[0073] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. A ladder belt mechanism for a Venetian blind, comprising: The base is fixed on the upper beam of the blinds; A ladder belt winding drum pivotally mounted on the base; A ladder belt with a top end wound on the ladder belt winding drum and a bottom end extending downward from the upper beam and connected to each curtain piece of the blind in sequence; a transmission shaft passing through the ladder belt winding drum along the central axis of the ladder belt winding drum and circumferentially fixed to the ladder belt winding drum; as well as A power member provided at one end of the transmission shaft for driving the transmission shaft and the ladder belt winding drum to rotate synchronously so that the ladder belt moves accordingly and drives the curtain sheet to rotate a corresponding angle; It is characterized in that the ladder belt mechanism further includes a limiting component, and the limiting component includes: A rotating arm provided on the transmission shaft and rotating synchronously with the transmission shaft; and A stopper is fixedly assembled relative to the upper beam on the rotation path of the rotating arm to limit the rotation angle range of the rotating arm.

2. The ladder belt mechanism of the Venetian blind according to claim 1, characterized in that: The rotating arm and the ladder belt winding drum are integrally formed.

3. The ladder belt mechanism of the Venetian blind according to claim 1, characterized in that: The opposite ends of the ladder belt winding drum are respectively protruded to form a pivot tube, and the base is correspondingly provided with a pivot groove for the pivot tube to be pivoted. The rotating arm is integrally formed at the end of at least one of the pivot tubes or fixedly assembled with the rotating arm.

4. The ladder belt mechanism of the Venetian blind according to claim 1, characterized in that: The rotating arm is fixedly assembled on the transmission shaft.

5. The ladder belt mechanism of the Venetian blind according to claim 1, characterized in that: The end of the rotating arm is used to form a slope at a position abutting against the stopper, which is in contact with the corresponding surface of the stopper.

6. The ladder belt mechanism of the Venetian blind according to claim 1, characterized in that: A stopper is provided in the rotation path of the rotating arm.

7. The ladder belt mechanism of the Venetian blind according to claim 1, characterized in that: Two stoppers are provided in the rotation path of the rotating arm, respectively defining the extreme positions of the rotating arm in different rotation directions.

8. The ladder belt mechanism of a Venetian blind according to any one of claims 1 to 7, characterized in that: The stopper is fixed on the base or on a mounting seat of the slat lifting mechanism of the blind, or the stopper is directly fixed on the upper beam.

9. A Venetian blind, comprising: Upper and lower beams arranged in parallel; a plurality of curtain blades arranged between the upper beam and the lower beam in parallel with the upper beam; a ladder belt mechanism provided on the upper beam and connected to the curtain pieces, and used for adjusting the angle of the curtain pieces; and A curtain slat lifting mechanism is provided on the upper beam and connected to the lower beam, and is used to drive the lower beam and the curtain slats to rise and fall. It is characterized in that the ladder belt mechanism is the ladder belt mechanism described in any one of claims 1-8.

10. The Venetian blind according to claim 9, wherein: The curtain slat lifting mechanism comprises: a mounting base fixed on the upper beam; a rope winding drum pivotally mounted on the mounting seat; A pull rope, the top end of which is wound around the rope drum and the bottom end of which extends downward from the upper beam and passes through the rope holes preset on each of the curtain pieces in sequence and is then fixed to the lower beam; and A lifting power component is connected to the rope drum to drive the rope drum to rotate and retract the pull rope to drive the lower beam and the curtain sheet to move up and down.

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