A blind

Abstract

The embodiment of the present invention discloses a blind, comprising a shielding blade, a front pull cord, a middle pull cord, and a rear pull cord. The front pull cord is arranged in front of the shielding blade, and the rear pull cord is arranged behind the shielding blade. The shielding blade comprises a primary baffle and a secondary baffle arranged at an angle to each other. The shielding blade is provided with a bar hole, and the middle pull cord passes through the bar hole. The front pull cord and the rear pull cord are both fixed with a supporting member, and the supporting member enables the front pull cord or the rear pull cord to form a relative fixed point with the shielding blade. The front pull cord and the rear pull cord can be driven to rise and fall relative to each other, driving the shielding blade to flip along with the rise and fall of the relative fixed point. The embodiment of the present invention also discloses a blind. By adopting the present invention, the blind blade can be flipped in both directions, and the control is smooth and precise, meeting the use requirements of different light-blocking occasions.

Description

Technical Field

[0001] The invention relates to the field of building shading products, in particular to a blind. Background Art

[0002] A blind is a curtain product that uses two or more control cords to connect blades, with the degree of obstruction controlled by the rotation of the blades. Existing blinds typically consist of flat blades fixed at different heights, with the blades rotating at an angle of approximately 90 degrees, transitioning from an open state (with the blades horizontal) to a closed state (with the blades vertical). Existing blinds have the following drawbacks:

[0003] 1. The existing blades are flat. In order to ensure smooth turning of the blades, a certain gap must be set between the blades. In the closed state, there will still be a certain amount of light leakage, affecting the overall shading effect.

[0004] 2. With the prevalence of glass partitions in different rooms of modern office buildings, there is an increasing demand for two-way shading switching of blinds. Since the blades are usually made of thin materials, the weight of the blades themselves cannot completely offset the elasticity of the control ropes themselves. If the flip angle of the blades is too large, it is easy to cause the position of the blades to be confused. The elastic force of the rope used to pull the blinds is also more obvious, resulting in uneven angles of the blades and affecting the overall shading uniformity. Summary of the Invention

[0005] In order to solve the defects of the prior art, the present invention provides a blind whose blades can be flipped in both directions and the control is smooth and precise, meeting the use requirements of different shading occasions.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a blind, including a shielding curtain blade, a front pull cord, a middle pull cord and a rear pull cord, wherein the front pull cord is arranged in front of the shielding curtain blade, and the rear pull cord is arranged behind the shielding curtain blade.

[0007] The shielding curtain blade includes a main baffle and a secondary baffle arranged at an angle to each other, and a strip hole is provided on the shielding curtain blade, and the middle pull rope passes through the strip hole. The strip hole runs forward and backward, with one end located on the secondary baffle and the other end passing the center of gravity of the shielding curtain blade;

[0008] The front and rear pull cords are both fixed with a supporting member, and the supporting member enables the front and rear pull cords to form a relative fixed point with the shade blade;

[0009] The front and rear pull cords can be driven to rise and fall relative to each other, driving the shade blades to flip along with the rise and fall of the relative fixed point;

[0010] The side of the main baffle is also provided with a gap light shielding plate, and the lower edge of the gap light shielding plate is provided with an avoidance groove;

[0011] The avoidance groove and the strip holes of the shielding curtain blades adjacent thereto form a light-transmitting hole;

[0012] The primary baffle and the secondary baffle are arranged at an obtuse angle to each other; the strip holes include a primary strip hole and a secondary strip hole respectively provided on the primary baffle and the secondary baffle, the primary strip hole is provided on a side of the primary baffle close to the secondary baffle, the secondary strip hole is provided on a side of the secondary baffle close to the primary baffle, and the primary strip hole and the secondary strip hole are connected to each other;

[0013] The shielding mechanism includes a shielding piece, one end of the shielding piece is hinged to the bottom of the main strip hole, and the other end is sleeved on the middle pull rope. One end of the shielding piece can swing around the bottom of the main strip hole, and the other end of the shielding piece can move vertically in the middle pull rope. The shielding piece can pass through the strip hole, and the shielding curtain blade can push the shielding piece in and out of the strip hole when swinging. When the main shielding piece is in a vertical state, the shielding piece can block the light-shielding hole.

[0014] As an improvement to the above solution, when the main baffle is in a vertical state, the lower edge of the gap shading plate has a predetermined gap with the shielding curtain blade adjacent below, and is located at the rear side of the main baffle adjacent below.

[0015] As an improvement to the above solution, the avoidance groove corresponds to the position of the main strip hole of the adjacent shielding curtain blade below.

[0016] As an improvement to the above scheme, the axis at 1 / 2 of the width of the secondary baffle is used as the first center line, the secondary strip hole crosses the first center line, and the ratio of the distance from the end of the secondary strip hole away from the primary baffle to the first center line to the distance from the primary baffle to the first center line is (2-5):10. The axis at 1 / 2 of the width of the main baffle is used as the second center line, the length of the main strip hole does not exceed the second center line, and the ratio of the distance from the end of the main strip hole away from the secondary baffle to the second center line to the distance from the secondary baffle to the second center line is (1-3):10.

[0017] As an improvement of the above-mentioned scheme, the blocking piece includes an upper blocking piece and a lower blocking piece, and the blocking mechanism also includes a ring, which is arranged at the upper end of the upper blocking piece and located above the secondary blocking piece, and the ring is arranged on the middle pull rope, and the width of the ring is greater than the width of the secondary strip hole. The lower end of the upper blocking piece is hinged to the upper end of the lower blocking piece, and the lower end of the lower blocking piece is hinged to the bottom of the main strip hole, and the upper blocking piece and the lower blocking piece can swing with each other.

[0018] As an improvement of the above-mentioned scheme, the shielding mechanism also includes a hinged seat, which is arranged on the side of the bottom of the main bar hole close to the secondary blocking piece. The hinged seat is arranged on both sides of the main bar hole and is symmetrically arranged. The shielding piece also includes a rotating shaft, which is arranged on both sides of the lower end of the lower blocking piece. The rotating shaft can rotate in the hinged seat.

[0019] As an improvement to the above solution, the projected length of the shielding piece on the vertical plane is greater than the total projected length of the avoidance groove and the bar hole on the vertical plane when the main shielding piece is in a vertical state.

[0020] As an improvement of the above solution, the supporting member is a transverse pull rope that transversely connects the front pull rope and the rear pull rope, and the transverse pull rope is arranged below the corresponding shielding curtain leaf; the transverse pull rope can be embedded in the avoidance groove, and the transverse pull rope is located above the shielding piece.

[0021] The implementation of the embodiments of the present invention has the following beneficial effects:

[0022] When the shielding curtain blades are flipped counterclockwise and clockwise in a horizontal state, the middle pull rope can pass over the center of gravity of the shielding curtain blades, avoiding the middle pull rope from hindering the flipping of the shielding curtain blades. The shielding curtain blades are pulled by the front pull ropes and the rear pull ropes and rely on their own gravity to stabilize at a predetermined flipping angle. The flipping stability will not be affected by the need to push the middle pull rope for lateral displacement. The shading angle of the curtain is precisely controlled and the shielding curtain blades have a large flipping angle to meet the usage needs of different shading occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a partial three-dimensional structure of the blind of the present invention;

[0024] Figure 2 This is a partial front structural schematic diagram of the blind of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the shielding mechanism of the present invention;

[0026] Figure 4 This is a schematic structural diagram of the blind of the present invention when it is closed;

[0027] Figure 5 This is a schematic structural diagram of the blind of the present invention when it is opened to a larger angle;

[0028] Figure 6 It is a schematic structural diagram of the blind of the present invention when it is opened to the extreme position. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in 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.

[0030] like Figure 1 and Figure 2 As shown, the shielding curtain leaf 1 is arranged in the curtain, and the shielding curtain leaf 1 includes a main baffle 11 and a secondary baffle 12 arranged at an angle to each other. A strip hole 13 is provided on the shielding curtain leaf 1, and the middle pull rope 3 passes through the strip hole 13. The strip hole 13 is in a front-to-back direction, one end is located on the secondary baffle 12, and the other end passes over the center of gravity 14 of the shielding curtain leaf 1.

[0031] This embodiment features a primary baffle 11 and a secondary baffle 12 arranged at an angle to each other, and a strip hole 13 extending forward and backward is provided on the shade blade 1, with the strip hole 13 passing over the center of gravity 14 of the shade blade 1. When the shade blade 1 is flipped counterclockwise and clockwise in a horizontal position, the center pull cord 3 is able to pass over the center of gravity 14 of the shade blade 1, preventing the center pull cord 3 from obstructing the flipping of the shade blade 1. Under the traction of the front and rear pull cords 2 and 4, and relying on its own gravity, the shade blade 1 is stabilized at a predetermined flipping angle, and the need to push the center pull cord 3 for lateral displacement will not affect the flipping stability. The shade angle of the blind is precisely controlled, and the shade blade 1 has a wide flipping angle, meeting the requirements of different shading occasions.

[0032] The main baffle 11 is also provided with a gap light shielding plate 16 on its side, and the avoidance groove 15 is provided at the edge of the gap light shielding plate 16 corresponding to the location of the front pull cord 2. When the main baffle 11 is in a vertical position, the lower edge of the gap light shielding plate 16 has a predetermined gap with the adjacent black curtain blade 1 below, and is located behind the adjacent main baffle 1 below.

[0033] When adjacent main baffles 11 are in a vertical state, a process gap still needs to be left to prevent the main baffles 11 from colliding with each other during the flipping process. In order to reduce the possibility of light leakage from the above-mentioned process gap, a gap light shielding plate 16 is designed in this embodiment. The gap light shielding plate 16 is located at the side edge of the main baffle 11 and bends toward the inner side of the main baffle 11. When the main baffle 11 is in a vertical state, the gap light shielding plate 16 extends obliquely from the rear of the main baffle 11, and moves the gap between it and the shielding curtain blade 1 below backward. Even if the light is oblique, most of it will be blocked and absorbed by the secondary baffle of the shielding curtain blade 1 below the gap light shielding plate 16, effectively preventing light from entering.

[0034] like Figure 3As shown, it should be noted that "the strip hole 13 runs forward and backward, with one end located on the secondary baffle 12 and the other end passing the center of gravity of the shade blade 1." Specifically, this means that in a vertical cross-section of the shade blade 1, one end of the strip hole 13 is located on the secondary baffle 12, and the other end passes the center of gravity of the shade blade 1. Because the width of the secondary baffle 12 of the shade blade 1 is often smaller than the primary baffle 11, the end of the strip hole 13 must be located on the primary baffle 11 in order to pass the center of gravity of the shade blade 1.

[0035] Preferably, in order to make the other end of the strip hole 13 pass over the center point of the shielding curtain blade 1, the strip hole 13 includes a main strip hole 131 and a secondary strip hole 132 respectively provided on the main baffle 11 and the secondary baffle 12, the main strip hole 131 is provided on one side of the main baffle 11 close to the secondary baffle 12, and the secondary strip hole 132 is provided on one side of the secondary baffle 12 close to the main baffle 11, the main strip hole 131 and the secondary strip hole 132 are connected to each other, and the strip hole 13 can swing relative to the middle pull rope 3 located between the main strip hole 131 and the secondary strip hole 132, and the strip hole 13 does not generate resistance to the middle pull rope 3, so it has the advantage of easy flipping. At the same time, since the width of the main baffle 11 is greater than the width of the secondary baffle 12, the center of gravity 14 of the shielding curtain blade 1 is located on the main baffle 11, and the strip hole 13 can easily exceed the center of gravity 14 of the shielding curtain blade 1.

[0036] The other end of the strip hole 13 passes over the center of gravity 14 of the shielding curtain leaf 1 and has the following advantages: the middle pull cord 3 of the traditional curtain leaf is located in a fixed circular hole in the secondary baffle 12. When flipping, the curtain leaf usually flips around the circular hole. This flipping method is limited by the position of the circular hole itself. On the one hand, the middle pull cord 3 is subjected to the friction of the circular hole. On the other hand, the curtain leaf flips around the fixed point when flipping, requiring a wider and higher flipping space, which will increase the overall thickness and height of the blind. However, when the strip holes 13 are located on both the main baffle 11 and the secondary baffle 12, the shielding curtain 1 is not subject to the friction force or travel restriction from the strip holes 13 when flipping, and it does not flip around a fixed point. Its flipping center is always changing, and the trend is to make the flipping space occupied by the shielding curtain 1 smaller. Specifically, during the flipping of the shielding curtain 1, the gap shading plate 16 does not need to rise to a very high height to make the main baffle 11 in a fully open position, and after the flipping is completed, the distance between the gap shading plate 16 and the middle pull rope 3 is much smaller than the distance after flipping around a fixed point.

[0037] Furthermore, in order to obtain a smoother and more stable flipping experience, it is necessary to set the specific length of the strip hole 13 to control the change of the center of gravity of the shielding curtain 1 during the flipping process, and take the axis at the width of the secondary baffle 121 / 2 as the first center line L1, the secondary strip hole 132 spans the first center line L1, and the ratio of the distance from the end of the secondary strip hole 132 away from the main baffle 11 to the first center line L1 to the distance from the main baffle 11 to the first center line L1 is (2-5):10, and take the axis at the width of the main baffle 111 / 2 as the second center line L2, the length of the main strip hole 131 does not exceed the second center line L2, and the ratio of the distance from the end of the main strip hole 131 away from the secondary baffle 12 to the second center line L2 to the distance from the secondary baffle 12 to the second center line L2 is (1-3):10. In the definition of the main strip hole 131 and the secondary strip hole 132, the flipping range of the shielding curtain blade 1 is limited, thereby limiting the range of change of the center of gravity and the flipping space of the shielding curtain blade 1, and the length of the strip hole 13 can be made as small as possible to reduce the probability of light transmission.

[0038] The avoidance groove 15 is used to avoid the front cord 2 and the supporting member 5 of the blind. When the blind slats 1 are turned over, the interstitial light shielding plate 16 will generate friction with the front cord 2. The avoidance groove 15 can create a certain distance between the front cord 2 and the interstitial light shielding plate 16, thereby reducing or even eliminating the friction between the front cord 2 and the interstitial light shielding plate 16. In addition, the supporting member 5 can also be embedded in the avoidance groove 15, applying an unbalanced force to the blind slats 1 to cause the blind slats 1 to turn over. During the process of opening or closing the blind slats 1, the supporting member 5 can be embedded in the avoidance groove 15, thereby reducing the friction between the supporting member 5 and the blind slats 1.

[0039] During use, the avoidance groove 15 can improve the convenience of opening and closing the shielding curtain 1, but if the length of the secondary baffle 12 and the length of the strip hole 13 are set unreasonably, since the avoidance groove 15 corresponds to the position of the secondary strip hole 132 of the adjacent shielding curtain 1 below, when the main baffle 11 is in a vertical state, the avoidance groove 15 and the strip hole 13 of the adjacent shielding curtain 1 below form a light-transmitting hole. Therefore, when the shielding curtain 1 is closed, the main baffle 11 is in a vertical state, and the light-transmitting hole can still pass through some light.

[0040] In order to solve the above problems, the black curtain of the present invention includes a shielding curtain blade 1, a front pull cord 2, a middle pull cord 3 and a rear pull cord 4, the front pull cord 2 is arranged in front of the shielding curtain blade 1, and the rear pull cord 4 is arranged behind the shielding curtain blade 1; the shielding curtain blade 1 includes a main baffle 11 and a secondary baffle 12 arranged at an angle to each other, and a strip hole 13 is provided on the shielding curtain blade 1, and the middle pull cord 3 passes through the strip hole 13. The strip hole 13 is in a forward and backward direction, one end is located on the secondary baffle 12, and the other end passes over the center of gravity 14 of the shielding curtain blade 1.

[0041] The strip holes 13 include a primary strip hole 131 and a secondary strip hole 132, respectively, provided on the primary baffle 11 and the secondary baffle 12. The primary strip hole 131 is provided on a side of the primary baffle 11 close to the secondary baffle 12, and the secondary strip hole 132 is provided on a side of the secondary baffle 12 close to the primary baffle 11. The primary strip hole 131 and the secondary strip hole 132 are interconnected. The strip holes 13 are capable of swinging relative to the middle pull cord 3 located between the primary strip hole 131 and the secondary strip hole 132. The strip holes 13 do not generate resistance to the middle pull cord 3, thus facilitating easy flipping. Furthermore, because the width of the primary baffle 11 is greater than that of the secondary baffle 12, the center of gravity of the blackout curtain 1 is located on the primary baffle 11, and the strip holes 13 easily exceed the center of gravity of the blackout curtain 1.

[0042] The front pull cord 2 and the rear pull cord 4 are both fixed with a supporting member 5, and the supporting member 5 enables the front pull cord 2 or the rear pull cord 4 to form a relative fixed point with the shielding curtain leaf 1; the front pull cord 2 and the rear pull cord 4 can be driven to rise and fall relative to each other, driving the shielding curtain leaf 1 to flip over as the relative fixed point rises and falls.

[0043] This embodiment is designed with a primary baffle 11 and a secondary baffle 12 arranged at an angle to each other, and a strip hole 13 running forward and backward is provided on the shade blade 1, and the strip hole 13 is arranged so that it passes the center of gravity of the shade blade 1. When the shade blade 1 is flipped counterclockwise and clockwise in a horizontal state, the central pull cord 3 can pass the center of gravity of the shade blade 1, preventing the central pull cord 3 from hindering the flipping of the shade blade 1. Under the traction of the front and rear pull cords 2 and 4, and relying on its own gravity, the shade blade 1 is stabilized at a predetermined flipping angle, and the need to push the central pull cord 3 for lateral displacement will not affect the flipping stability. The shading angle of the blind is precisely controlled, and the shade blade 1 can flip over a large angle to meet the needs of different shading occasions. Moreover, after the strip hole 13 is provided, the strip hole 13 can swing relative to the middle pull rope 3 located between the main strip hole 131 and the secondary strip hole 132. The strip hole 13 does not generate resistance to the middle pull rope 3, and thus has the advantage of being easy to flip.

[0044] Due to the presence of the support member 5, when the main baffle 11 is in the vertical position, a gap must be reserved between adjacent main baffles 11 to allow the support member 5 to pass through. This, combined with the process clearance required to prevent collisions between the main baffles 11, results in a large space between adjacent main baffles 11. Light escapes through this space, affecting the light-blocking properties of the main baffle 11 in the vertical position. To this end, an escape groove 15 is provided along the edge of the main baffle 11, corresponding to the location of the front draw cord 2. This escape groove 15 allows the support member 5 to pass through, eliminating the space reserved for the support member 5. However, the support member 5 passing through will block the escape groove 15, further reducing the possibility of light transmission.

[0045] The main baffle 11 is also provided with a gap light shielding plate 16 on its side, and the avoidance groove 15 is provided at the edge of the gap light shielding plate 16 corresponding to the location of the front pull cord 2. When the main baffle 11 is in a vertical position, the lower edge of the gap light shielding plate 16 has a predetermined gap with the adjacent black curtain blade 1 below, and is located behind the adjacent main baffle 1 below.

[0046] When adjacent main baffles 11 are in a vertical state, a process gap still needs to be left to prevent the main baffles 11 from colliding with each other during the flipping process. In order to reduce the possibility of light leakage from the above-mentioned process gap, a gap light shielding plate 16 is designed in this embodiment. The gap light shielding plate 16 is located at the side edge of the main baffle 11 and bends toward the inner side of the main baffle 11. When the main baffle 11 is in a vertical state, the gap light shielding plate 16 extends obliquely from the rear of the main baffle 11, and moves the gap between it and the shielding curtain blade 1 below backward. Even if the light is oblique, most of it will be blocked and absorbed by the secondary baffle of the shielding curtain blade 1 below the gap light shielding plate 16, effectively preventing light from entering.

[0047] It should be noted that "the strip hole 13 runs forward and backward, with one end located on the secondary baffle 12 and the other end passing the center of gravity of the shade blade 1" specifically means that, in a vertical cross-section of the shade blade 1, one end of the strip hole 13 is located on the secondary baffle 12, and the other end passes the center of gravity of the shade blade 1. Because the width of the secondary baffle 12 of the shade blade 1 is often smaller than the primary baffle 11, the end of the strip hole 13 must be located on the primary baffle 11 in order to pass the center of gravity of the shade blade 1.

[0048] Preferably, the primary baffle 11 and the secondary baffle 12 are arranged at an obtuse angle to each other. With this angle, when one of the primary baffle 11 and the secondary baffle 12 is in a vertical position, the corresponding secondary baffle 12 or primary baffle 11 on the same blind slat 1 is in an upwardly slanted position, thereby also being able to block, to a certain extent, the flat light passing through the gap between the vertical baffles.

[0049] As one embodiment of the support member 5, the support member 5 is a transverse cord 51 that transversely connects the front and rear cords 2 and 4. The transverse cord 51 is positioned below the corresponding shade blade 1. The transverse cord 51 serves as a support member, not only supporting the shade blade 1 and driving its rotation, but also limiting the distance between the front and rear cords 2 and 4, preventing them from becoming excessively large. The transverse cord 51 can be embedded in the avoidance groove 15, thereby reducing the minimum spacing required between the main baffles 11 in the vertical position.

[0050] More preferably, when the main baffle 11 is in a vertical state, for the shielding curtain blade 1 composed of the main baffle 11, the secondary baffle 12 and the gap shading plate 16, the gap shading plate 16 can abut against the secondary baffle 12 of the adjacent shielding curtain blade 1 below, and the gap shading plate 16 and the secondary baffle 12 of the adjacent shielding curtain blade 1 below form a light-blocking structure to block the side light.

[0051] Further, if Figure 3 As shown, in order to block the light-transmitting hole formed by the avoidance groove 15 and the strip hole 13 of the adjacent shielding curtain blade 1 below, the curtain also includes a blocking mechanism 6, and the blocking mechanism 6 includes a blocking piece 61, one end of the blocking piece 61 is hinged to the bottom of the main strip hole 131, and the other end is sleeved on the middle pull rope 3. When the shielding curtain blade 1 is flipped, one end of the blocking piece 61 can swing around the bottom of the main strip hole 131 to adapt to the movement of the shielding curtain blade 1, and the other end of the blocking piece 61 can move vertically in the middle pull rope 3, and the blocking piece 61 can pass through the strip hole 13. When the shielding curtain blade 1 swings, it can push the blocking piece 61 in and out of the strip hole 13. When the main blocking piece 11 is in a vertical state, the blocking piece 61 can block the light-transmitting hole.

[0052] See also Figure 4-Figure 6When the blind needs to be opened, the shielding blade 1 drives the bottom of the shielding piece 61 to move horizontally and vertically. Since the upper end of the shielding piece 61 is sleeved on the middle pull cord 3, the movement of the bottom of the shielding piece 61 will push the upper end of the shielding piece 61 to move upward. As the opening angle of the main baffle 11 increases, the shielding piece 61 moves out of the bar hole 13 and gradually moves above the main baffle 11. During this process, the shielding piece 61 always keeps a distance from the horizontal pull cord 51 and the front pull cord 2, so it will not hinder the opening of the blind. When the blind is fully opened, the end of the main bar hole 131 contacts the middle pull cord 3, so that the shielding piece 61 is almost vertically in contact with the middle pull cord 3, thereby minimizing the obstruction of light as much as possible and achieving a better light transmission effect.

[0053] When the blind needs to be closed, the shielding curtain blade 1 drives the upper end of the shielding piece 61 to move slowly downward, and the lower end of the shielding piece 61 follows the main baffle 11 to move until the shielding piece 61 enters the bar hole 13. During this process, the movements of the horizontal pull rope 51, the front pull rope 2 and the shielding piece 61 are independent of each other and do not affect each other. After the main baffle 11 is in a vertical state, the shielding piece 61 has been stuck in the bar hole 13, and the shielding piece 61 can block the light-transmitting hole formed by the bar hole 13 and the avoidance groove 15, thereby achieving a better shielding effect.

[0054] Whether the blind is opened or closed, the shielding mechanism 6 will not affect the horizontal pull cord 51 and the front pull cord 2, nor will it hinder the flipping of the blind blade 1. The shielding piece 61 can block the light-transmitting hole. Therefore, the shielding mechanism 6 can achieve better light transmission and shielding effects without increasing the difficulty of flipping the blind.

[0055] Specifically, the blocking piece 61 includes an upper blocking piece 611 and a lower blocking piece 612, and the blocking mechanism 6 also includes a ring 62, which is arranged at the upper end of the upper blocking piece 611 and located above the secondary blocking piece 12, and the ring 62 is sleeved on the middle pull rope 3, and the width of the ring 62 is greater than the width of the secondary bar hole 132, so the ring 62 will always be located above the secondary blocking piece 12 and will not slide down to the bottom of the secondary blocking piece 12 through the secondary bar hole 132, so as to ensure that the blocking piece 61 moves up and down normally, the lower end of the upper blocking piece 611 is hinged to the upper end of the lower blocking piece 612, and the lower end of the lower blocking piece 612 is hinged to the bottom of the main bar hole 131, and the upper blocking piece 611 and the lower blocking piece 612 can swing relative to each other. The upper blocking piece 611 and the lower blocking piece 612 have the freedom to swing relative to each other, and thus can adapt to the situation where the collar 62 moves vertically and the lower blocking piece 612 moves in multiple directions.

[0056] In order to better enable the shielding piece 61 to follow the flipping, the shielding mechanism 6 also includes a hinged seat 63, which is arranged on the side of the bottom of the main bar hole 131 close to the secondary blocking piece 12. The hinged seat 63 is arranged on both sides of the main bar hole 131 and is symmetrically arranged. The shielding piece 61 also includes a rotating shaft 613, which is arranged on both sides of the lower end of the lower blocking piece 612. The rotating shaft 613 can rotate in the hinged seat 63.

[0057] The total length of the upper baffle 611 and the lower baffle 612 is fixed. Therefore, the shielding piece 61 is arranged between the middle cord 3 and the main baffle 11, which can not only achieve a good light shielding effect, but also limit the flipping range of the main baffle 11. During the upward flipping of the main baffle 11, the ring 62 defines the distance between the main baffle 11 and the middle cord 3 through the upper baffle 611 and the lower baffle 612. Moreover, as the ring 62 moves upward, the horizontal distance between the ring 62 and the bottom of the lower baffle 612 first increases and then decreases. This shortening effect causes the main baffle 11 to open upward rapidly until the horizontal distance between the ring 62 and the bottom of the lower baffle 612 is reduced to nearly zero. At this time, the end of the main bar hole 131 also contacts the middle cord 3, thereby quickly completing the flipping of the black curtain blade 1. The process of closing the black curtain blade 1 is similar and will not be repeated here.

[0058] Therefore, the shielding mechanism 6 not only does not increase the difficulty of turning over the blind, but can also further reduce the difficulty of turning over the blind, thereby achieving a better balance between the difficulty of turning over and the degree of shielding of the blind.

[0059] The projected length of the shielding piece 61 on a vertical plane is greater than the total projected length of the avoidance groove 15 and the strip hole 13 on a vertical plane when the main shielding piece 11 is in a vertical position. In this way, the shielding piece 61 can be inserted into the strip hole 13 and block the light transmission hole formed by the avoidance groove 15 and the strip hole 13.

[0060] 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 blind, characterized in that: The device comprises a shielding curtain blade, a front pull cord, a middle pull cord and a rear pull cord, wherein the front pull cord is arranged in front of the shielding curtain blade, and the rear pull cord is arranged behind the shielding curtain blade; The shielding curtain blade includes a main baffle and a secondary baffle arranged at an angle to each other, and a strip hole is provided on the shielding curtain blade, and the middle pull rope passes through the strip hole. The strip hole runs forward and backward, with one end located on the secondary baffle and the other end passing the center of gravity of the shielding curtain blade; The front and rear pull cords are both fixed with a supporting member, and the supporting member enables the front and rear pull cords to form a relative fixed point with the shade blade; The front and rear pull cords can be driven to rise and fall relative to each other, driving the shade blades to flip along with the rise and fall of the relative fixed point; The side of the main baffle is also provided with a gap light shielding plate, and the lower edge of the gap light shielding plate is provided with an avoidance groove; The avoidance groove and the strip holes of the shielding curtain blades adjacent thereto form a light-transmitting hole; The main baffle and the secondary baffle are arranged at an obtuse angle to each other; the strip holes include a main strip hole and a secondary strip hole respectively provided on the main baffle and the secondary baffle, the main strip hole is provided on a side of the main baffle close to the secondary baffle, the secondary strip hole is provided on a side of the secondary baffle close to the main baffle, the main strip hole and the secondary strip hole are connected to each other, and the avoidance groove corresponds to the position of the main strip hole of the adjacent shielding curtain blade below; It also includes a shielding mechanism, which includes a shielding piece, one end of which is hinged to the bottom of the main strip hole, and the other end is sleeved on the middle pull rope. One end of the shielding piece can swing around the bottom of the main strip hole, and the other end of the shielding piece can move vertically in the middle pull rope. The shielding piece can pass through the strip hole, and the shielding curtain blade can push the shielding piece in and out of the strip hole when swinging. When the main shielding piece is in a vertical state, the shielding piece can block the light-transmitting hole.

2. The blind according to claim 1, wherein: When the main baffle is in a vertical state, a lower edge of the gap shading plate has a predetermined gap with the shielding blade adjacent below, and is located at the rear side of the main baffle adjacent below.

3. The blind according to claim 1, wherein: Taking the axis at 1 / 2 of the width of the secondary baffle as the first center line, the secondary strip hole crosses the first center line, and the ratio of the distance from the end of the secondary strip hole away from the primary baffle to the first center line to the distance from the primary baffle to the first center line is (2-5):

10. Taking the axis at 1 / 2 of the width of the primary baffle as the second center line, the length of the primary strip hole does not exceed the second center line, and the ratio of the distance from the end of the primary strip hole away from the secondary baffle to the second center line to the distance from the secondary baffle to the second center line is (1-3):

10.

4. The blind according to claim 1, wherein: The shielding piece includes an upper shielding piece and a lower shielding piece, and the shielding mechanism also includes a ring, which is arranged at the upper end of the upper shielding piece and located above the secondary shielding piece. The ring is sleeved on the middle pull rope, and the width of the ring is greater than the width of the secondary strip hole. The lower end of the upper shielding piece is hinged to the upper end of the lower shielding piece, and the lower end of the lower shielding piece is hinged to the bottom of the main strip hole. The upper shielding piece and the lower shielding piece can swing relative to each other.

5. The blind according to claim 4, wherein: The shielding mechanism also includes a hinged seat, which is arranged on one side of the bottom of the main bar hole close to the secondary blocking piece. The hinged seat is arranged on both sides of the main bar hole and is symmetrically arranged. The shielding piece also includes a rotating shaft, which is arranged on both sides of the lower end of the lower blocking piece. The rotating shaft can rotate in the hinged seat.

6. The blind according to claim 5, wherein: The projected length of the shielding piece on the vertical plane is greater than the total projected length of the avoidance groove and the bar hole on the vertical plane when the main shielding piece is in a vertical state.

7. The blind according to claim 6, wherein: The supporting member is a transverse pull rope that transversely connects the front pull rope and the rear pull rope, and the transverse pull rope is arranged below the corresponding shielding curtain blade; the transverse pull rope can be embedded in the avoidance groove, and the transverse pull rope is located above the shielding piece.

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