A balance mechanism for retracting and extending a louver blind and a louver window

Abstract

The present invention discloses a balance mechanism for retracting and extending a louver blind and a louver window, which relates to the technical field of door and window structures and includes a window frame and a long strip rod of the louver blind. Two parallel driving shaft units are rotatably installed in the window frame. Two parallel and juxtaposed transmission belts are connected in transmission between the two driving shaft units. Both ends of the rod body of the long strip rod are perpendicularly connected to the corresponding transmission belts respectively. By providing two parallel and juxtaposed transmission belts on the window frame in the present invention, both ends of the rod body of the long strip rod are perpendicularly connected to the corresponding transmission belts through correction components respectively, and the two parallel driving shaft units are used to drive the transmission belts synchronously, so as to increase the evenness of the forces on both ends of the rod body of the long strip rod during the movement process, which is beneficial to maintaining a balanced state during the movement of the blades, thereby greatly reducing the situation of jamming or even bending and damage during the movement of the blades, and improving the stability of the louver blind during the opening and closing movement process.

Description

Technical Field

[0001] The present invention relates to the technical field of door and window structures, and in particular to a venetian blind retraction and extension balancing mechanism and a venetian blind. Background Art

[0002] The blinds are mainly composed of a venetian blind and a window body, which are respectively provided with a blade angle adjustment mechanism for adjusting the light, and a retractable mechanism for changing the position of the blades on the window body, so that the posture of the blinds can be adjusted according to the actual needs of the user;

[0003] For example, the existing Chinese patent publication number is "CN212898257U", and the patent is titled "Venetian Blinds". The patent includes "a housing, a curtain body, a blade angle adjustment device, and a first pull cord. The curtain body is disposed below the housing and includes a plurality of blades and a lower end portion. The blade angle adjustment device includes a rotating shaft assembly and a ladder rope assembly. The rotating shaft assembly is disposed in the housing. The ladder rope assembly includes at least two ladder ropes connected to the rotating shaft assembly and driven by the rotating shaft assembly to drive the blades to rotate."

[0004] The venetian blinds include blades and long rods arranged parallel to the blades. The position of the blades is changed by pulling or releasing ropes connected to the two ends of the long rods. However, the above scheme has the disadvantage that the ropes at both ends of the long rods are easily pulled or released inconsistently, resulting in the blades being tilted and pulled during movement. Moreover, as the pulling error of the rope accumulates, the blades of the venetian blinds may easily become stuck or even bend and be damaged. Summary of the Invention

[0005] The object of the present invention is to provide a venetian blind retraction and extension balancing mechanism and a venetian blind to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A venetian blind retraction and extension balancing mechanism includes a window frame and a long strip of venetian blinds. Two parallel drive shaft units are rotatably installed in the window frame. Two parallel transmission belts are connected to each other for transmission. The two ends of the rod body of the long strip are respectively connected perpendicularly to the corresponding transmission belts.

[0008] Preferably, the drive shaft unit comprises a shaft rotatably connected to the window frame, and a belt reel adapted for transmission with a corresponding transmission belt is coaxially fixed on the shaft body.

[0009] Preferably, a correction assembly is provided at each end of the long rod, and the correction assembly includes a accommodating cavity located inside the long rod, an axial rod is rotatably installed in the accommodating cavity, a through opening is provided on the long rod for the transmission belt to pass through the accommodating cavity, and a roller is coaxially fixed on the axial rod and is in transmission contact with the transmission belt.

[0010] Preferably, a torsion bar parallel to the long strip rod is rotatably installed inside the window frame. The torsion bar and the shaft rod are drivingly connected through a plurality of ladder rope groups, and the movement of the ladder rope groups can drive the blades of the louver curtain to deflect.

[0011] Preferably, a first magnetic strip is fixed on the rod body of the long strip rod, and a second magnetic strip magnetically adsorbed to the first magnetic strip is fixed on the window frame. When the louver curtain is fully unfolded, the first magnetic strip and the second magnetic strip are magnetically fixed to each other.

[0012] Preferably, the transmission belt includes a belt body, and the head and tail ends of the belt body form a closed loop structure through a connector.

[0013] Preferably, a fixed pulley in contact with the belt body is provided on each side of the belt pulley, and the wheel body of each fixed pulley is rotatably installed on the wall surface of the accommodating cavity.

[0014] Preferably, a track structure is provided on the frame body of the window frame, and a plurality of sliding piece units are slidably installed on the track structure. Each sliding piece unit is fixedly corresponding to the blade of the louver curtain.

[0015] Preferably, the shaft rod includes a sleeve rotatably installed in the accommodating cavity. A first bevel gear is rotatably installed on the inner wall surface of the sleeve. A rod is rotatably inserted at each end of the sleeve. A second bevel gear meshing with the first bevel gear is fixed at the end of each rod, and the roller is coaxially fixed with the rod.

[0016] Preferably, the above-mentioned louver curtain retracting and extending balance mechanism is provided on the louver window.

[0017] In the above technical solution, a louver curtain retracting and extending balance mechanism provided by the present invention increases the evenness of the forces on both ends of the rod body of the long strip rod during movement by arranging two parallel transmission belts on the window frame, vertically connecting both ends of the rod body of the long strip rod to the corresponding transmission belts respectively, and synchronously driving the transmission belts through two parallel drive shaft units. This is beneficial to maintaining the balance state of the blades during movement, thus greatly reducing the situation of jamming or even bending and damage of the blades during movement, and improving the stability of the louver curtain during the opening and closing movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0019] Figure 1Schematic cross-sectional view of the window frame of a louver curtain retracting and balancing mechanism according to the present invention;

[0020] Figure 2 According to the present invention Figure 1 Enlarged view of part A in;

[0021] Figure 3 Schematic diagram of the long bar of a louver curtain retracting and balancing mechanism according to the present invention;

[0022] Figure 4 According to the present invention Figure 3 Schematic cross-sectional view taken along line B-B in;

[0023] Figure 5 Schematic diagram of the driving contact between the transmission belt and the roller of a louver curtain retracting and balancing mechanism according to the present invention;

[0024] Figure 6 Schematic diagram of the transmission belt of a louver curtain retracting and balancing mechanism according to the present invention;

[0025] Figure 7 Schematic diagram of the sliding fit between the sliding piece and the track structure of a louver curtain retracting and balancing mechanism according to the present invention;

[0026] Figure 8 Schematic diagram of the structure of the elastic meshing tooth structure of a louver curtain retracting and balancing mechanism according to the present invention;

[0027] Figure 9 Schematic diagram of the window frame of a louver curtain retracting and balancing mechanism according to the present invention being a straight face frame;

[0028] Figure 10 Schematic diagram of the window frame of a louver curtain retracting and balancing mechanism according to the present invention being a curved face frame.

[0029] Explanation of reference numerals:

[0030] 1, window frame; 2, long bar; 3, drive shaft unit; 3.1, shaft rod; 3.2, belt pulley; 3.21, outer disc ring; 3.22, inner disc body; 3.23, elastic meshing tooth structure; 3.231, insertion hole; 3.232, pin rod; 3.233, spring; 3.234, V-shaped groove; 4, transmission belt; 4.1, belt body; 4.2, connection head; 5, calibration component; 5.1, accommodation cavity; 5.2, shaft rod; 5.21, sleeve; 5.22, first bevel gear; 5.23, rod; 5.24, second bevel gear; 5.3, through hole; 5.4, roller; 6, torsion bar; 7, ladder rope group; 8, first magnetic strip; 9, second magnetic strip; 10, fixed pulley; 11, track structure; 12, sliding piece unit; 13, notch. Detailed implementation manners

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Please refer to Figure 1-10 , a retractable balance mechanism for a louver curtain provided by an embodiment of the present invention includes a window frame 1 and a long strip rod 2 of the louver curtain. Two parallel drive shaft units 3 are rotatably installed in the window frame 1. Two parallel and juxtaposed transmission belts 4 are drivingly connected between the two drive shaft units 3. Both ends of the rod body of the long strip rod 2 are perpendicularly connected to the corresponding transmission belts 4 respectively;

[0033] Specifically, the window frame 1 is a rectangular frame body, the louver curtain is a conventional curtain structure, the louver curtain includes a plurality of long strip-shaped blades, and the plurality of blades are fixedly connected in series through a ladder rope group 7. One end of the ladder rope group 7 is fixed to the long strip rod 2. The two drive shaft units 3 are close to the corresponding window frame 1. The rotation forms of the two drive shaft units 3 are synchronous, in the same direction and at the same speed. The transmission belt 4 is a long strip-shaped belt body, and the two transmission belts 4 are symmetrically distributed about the central position of the long strip rod 2;

[0034] During actual use, the drive shaft unit 3 rotates axially, thereby driving the two transmission belts 4 to move synchronously. At this time, under the connection action of the correction assembly 5, the long strip rod 2 can move smoothly along the movement direction of the transmission belt 4. In the whole process, the two drive shaft units 3 perform the same movement, so as to ensure that the movement states of the two transmission belts 4 are consistent. Furthermore, the long strip rod 2 fixed to the two transmission belts 4 through the correction assembly 5 always maintains a stable state during the movement process. The degree of evenness of the force received by the long strip rod 2 during the movement process is improved, which is beneficial to maintaining the balance state of the blades during the movement process, thereby greatly reducing the situation of jamming or even bending and damage of the blades during the movement process, and improving the stability of the louver curtain during the opening and closing movement process.

[0035] Another embodiment provided by the present invention, the drive shaft unit 3 includes a shaft rod 3.1 rotatably connected to the window frame 1. A belt pulley 3.2 drivingly adapted to the corresponding transmission belt 4 is coaxially fixed on the rod body of the shaft rod 3.1. One of the shaft rods 3.1 is drivingly connected to a driving mechanism, and the driving mechanism can be selected as a driving motor. There is a driving friction force between the belt pulley 3.2 and the transmission belt 4;

[0036] During actual use, when the driving unit 3 rotates forward, that is, the shaft rod 3.1 drives another one to rotate forward synchronously with the shaft rod 3.1 through two parallel and juxtaposed transmission belts 4. At this time, the long strip rod 2 moves forward on the window frame 1. Thus, the forward-moving long strip rod 2 drives the venetian blind to unfold on the window frame 1. Similarly, when the driving unit 3 rotates backward, that is, the shaft rod 3.1 drives another one to rotate backward synchronously with the shaft rod 3.1 through two parallel and juxtaposed transmission belts 4. At this time, the long strip rod 2 moves backward on the window frame 1. Thus, the backward-moving long strip rod 2 drives the venetian blind to retract on the window frame 1. During the whole process, by changing the rotation direction of the driving unit 3, the unfolding and retracting of the venetian blind on the window frame 1 can be realized, and the operation is simple and convenient.

[0037] In another embodiment provided by the present invention, correction components 5 are respectively arranged at both ends of the long strip rod 2. The correction component 5 includes a receiving cavity 5.1 inside the long strip rod 2. The receiving cavity 5.1 is a long columnar cavity whose axis coincides with the axis of the long strip rod 2. A shaft rod 5.2 is rotatably installed in the receiving cavity 5.1. The axis of the shaft rod 5.2 coincides with the axis of the long strip rod 2. The shaft rod 5.2 is a hexagonal prism rod with a regular hexagonal cross-section. Through holes 5.3 for the transmission belts 4 to penetrate the receiving cavity 5.1 are opened on the long strip rod 2. There are two groups of through holes 5.3, which are respectively close to the side surface areas at both ends of the long strip rod 2. A roller 5.4 in transmission contact with the transmission belt 4 is coaxially fixed on the shaft rod 5.2. There is a transmission friction force between the roller 5.4 and the transmission belt 4.

[0038] It should be particularly noted that both of the two parallel and juxtaposed transmission belts 4 have an inner circumferential wall surface and an outer circumferential wall surface. The positions of the two parallel and juxtaposed transmission belts 4 on the window frame 1 are respectively a first area and a second area. That is to say, the window frame 1 has two symmetrically arranged area positions. One transmission belt 4 is arranged at one of the area positions, and another transmission belt 4 is also arranged at the other area position. The transmission belts 4 at the two area positions are parallel and juxtaposed to each other. Both ends of the shaft rod 5.2 are respectively located in the first area and the second area. Among them, the roller 5.4 at one end of the shaft rod 5.2 is in contact with and drives the inner circumferential wall surface of the transmission belt 4 in the first area, and the roller 5.4 at the other end of the shaft rod 5.2 is in contact with and drives the outer circumferential wall surface of the transmission belt 4 in the second area.

[0039] When the long strip rod 2 is in a normal state, the angle between the axis line of the long strip rod 2 and the moving track line is perpendicular. The specific situation of the driving belt 4 driving the long strip rod 2 to move forward through the correction assembly 5 is that since rollers 5.4 are fixed at both ends of the shaft rod 5.2, and the positions where the rollers 5.4 at both ends of the shaft rod 5.2 contact the corresponding driving belts 4 are different. Therefore, when the two driving belts 4 in the first region and the second region move forward synchronously, at this time, the driving belt 4 in the first region exerts a clockwise torsional force on the roller 5.4, while the driving belt 4 in the second region exerts a counterclockwise torsional force on the roller 5.4. The resultant force of the two is the same as the moving direction of the driving belt 4. Thus, under the static friction force of the driving belt 4 in the first region and the driving belt 4 in the second region, the roller 5.4 drives the long strip rod 2 to move forward along with the driving belt 4, and then the shutter expands on the window frame 1 along with the forward movement of the long strip rod 2;

[0040] Similarly, when the two driving belts 4 in the first region and the second region move backward synchronously, the shutter retracts on the window frame 1 along with the backward movement of the long strip rod 2;

[0041] In addition, when the angle between the axis line of the long strip rod 2 and the moving track line is in a non-perpendicular state, the rod body of the long strip rod 2 is in a skew state. For example, during the forward movement of the skew long strip rod 2, when the inclined end of the skew long strip rod 2 contacts the window frame 1, the contact end is blocked by the window frame 1 and no longer moves along with the corresponding driving belt 4;

[0042] At this time, since there is a driving friction force between the roller 5.4 and the driving belt 4 in this region. For example, this region is the first region. Therefore, as the driving belt 4 in the first region continues to move forward, the roller 5.4 drives the shaft rod 5.2 to rotate forward correspondingly in the accommodation cavity 5.1, so that the roller 5.4 in the second region also rotates coaxially. Also, since the roller 5.4 in the first region contacts and drives the inner wall surface of the loop of the driving belt 4, and the roller 5.4 in the second region contacts and drives the outer wall surface of the loop of the driving belt 4, the roller 5.4 in the second region rolls in the same direction as the movement direction of the driving belt 4 in the second region when contacting the corresponding driving belt 4, so that the skew long strip rod 2 is restored to the normal state, enabling the long strip rod 2 to have a self-balancing effect during the movement on the window frame 1 and achieving multiple calibration effects on the state of the long strip rod 2.

[0043] Another embodiment provided by the present invention, the calibration component 5 includes a receiving cavity 5.1 located inside the long strip rod 2. A shaft rod 5.2 is rotatably installed in the receiving cavity 5.1. A through hole 5.3 for the transmission belt 4 to penetrate through the receiving cavity 5.1 is provided on the long strip rod 2. A roller 5.4 in transmission contact with the transmission belt 4 is coaxially fixed on the shaft rod 5.2. The roller 5.4 can be selected as a toothed roller structure. The transmission belt 4 includes a belt body 4.1. The head and tail ends of the belt body 4.1 form a closed annular structure through a connector 4.2. The two parallel and juxtaposed transmission belts 4 both have an inner ring wall surface and an outer ring wall surface. Both of the two rollers 5.4 are in contact with the inner ring wall surface of the transmission belt 4, or both of the two rollers 5.4 are in contact with the outer ring wall surface of the transmission belt 4;

[0044] Further, the shaft rod 5.2 includes a sleeve 5.21 rotatably installed in the receiving cavity 5.1. A first bevel gear 5.22 is rotatably installed on the inner wall surface of the sleeve 5.21. A rod 5.23 is rotatably inserted at each end of the sleeve 5.21. A second bevel gear 5.24 meshing with the first bevel gear 5.22 is fixed at the end of each rod 5.23. The roller 5.4 is coaxially fixed with the rod 5.23;

[0045] A notch 13 for the ladder rope group 7 to movably penetrate through is provided on the side of the receiving cavity 5.1. In addition, a torsion rod 6 parallel to the long strip rod 2 is rotatably installed in the window frame 1. The torsion rod 6 is in transmission connection with the shaft rod 5.2 through a plurality of ladder rope groups 7. The movement of the ladder rope group 7 can drive the blades of the venetian blind to deflect. Specifically, each ladder rope group 7 is fixedly connected to the sleeve 5.21 of the shaft rod 5.2;

[0046] In addition, a first magnetic strip 8 is fixed on the rod body of the long strip rod 2, and a second magnetic strip 9 magnetically adsorbed to the first magnetic strip 8 is fixed on the window frame 1. When the venetian blind is fully unfolded, the first magnetic strip 8 and the second magnetic strip 9 are magnetically fixed to each other;

[0047] And the deflection range of the ladder rope group 7 is limited and it cannot rotate continuously in the same direction. The shaft rod 5.2 is in transmission connection with the torsion rod 6 through a plurality of ladder rope groups 7, resulting in the limited rotation angle of the shaft rod 5.2. The shaft rod 5.2 can only deflect reciprocally within a certain range. The roller 5.4 is coaxially fixed with the shaft rod 5.2. Therefore, the roller 5.4 can also only deflect reciprocally within a certain range. For example, when the roller 5.4 deflects forward to the maximum forward position, it will no longer continue to rotate. Similarly, when the roller 5.4 deflects backward to the maximum backward position, it will no longer continue to rotate;

[0048] During the actual use process, the specific principle of the long bar 2 moving on the window frame 1 through the calibration component 5 is as follows: For example, the rotating roller 5.4 is at the forward maximum position. When the shaft rod 3.1 drives another shaft rod that rotates synchronously and forward through two parallel belts 4 arranged side by side, the part 4.1 of the belt 4 close to the long bar 2 also moves forward;

[0049] During the forward movement of the belt part 4.1, due to the driving friction between the rotating roller 5.4 and the belt 4, and at this time the rotation of the rotating roller 5.4 at the forward maximum position is restricted, the rotating roller 5.4 cannot rotate in the accommodation cavity 5.1 under the static friction of the belt 4. Therefore, under the drive of the static friction of the belt 4, the rotating roller 5.4 drives the long bar 2 to move forward along with the belt 4 through the shaft rod 5.2. Furthermore, the venetian blind moves forward along with the long bar 2 and unfolds on the window frame 1;

[0050] When the venetian blind is in the fully unfolded state, at this time the long bar 2 is flush and attached to the edge of the window frame 1. At this time, the first magnetic strip 8 on the rod body of the long bar 2 is magnetically adsorbed to the second magnetic strip 9 on the window frame 1, thereby increasing the stability of the long bar 2 on the window frame 1, and further continuously maintaining the fully unfolded state of the venetian blind;

[0051] When the venetian blind is in the fully unfolded state, at this time the shaft rod 3.1 drives another shaft rod that rotates synchronously and reversely through two parallel belts 4 arranged side by side. Since the first magnetic strip 8 on the rod body of the long bar 2 is magnetically adsorbed to the second magnetic strip 9 on the window frame 1, the reverse movement of the long bar 2 is hindered by pulling. During this process, the part 4.1 of the belt 4 close to the long bar 2 still moves reversely. Due to the driving friction between the rotating roller 5.4 and the belt 4, during this reverse movement, the rotating roller 5.4 rotates from the forward maximum position towards the reverse maximum position. And through the transmission of the shaft rod 5.2 and the shaft rod 5.2, the blade angle of the venetian blind can be deflected, realizing the adjustment of the blade angle of the venetian blind, and the light transmittance can be adjusted according to requirements;

[0052] When the rotating roller 5.4 reaches the reverse maximum position from the forward maximum position, the connector 4.2 on the transmission belt 4 also reaches the side of the long bar 2. The diameter value of the connector 4.2 is greater than the diameter value of the through hole 5.3, and the connector 4.2 cannot pass through the through hole 5.3. At this time, if the shaft rod 3.1 is continuously driven by two parallel transmission belts 4 to drive another shaft rod that rotates synchronously and reversely with the shaft rod 3.1, the connector 4.2 on the transmission belt 4 will exert a thrust on the reverse movement of the long bar 2, thereby overcoming the magnetic adsorption force between the first magnetic strip 8 on the rod body of the long bar 2 and the second magnetic strip 9 on the window frame 1, so that the long bar 2 moves reversely along with the transmission belt 4, and then the louvre curtain moves reversely along with the long bar 2 and is retracted on the window frame 1;

[0053] In addition, during the movement of the long bar 2 on the window frame 1 through the calibration assembly 5, in the normal state of the long bar 2, the included angle between the axis line of the long bar 2 and the movement track line is in a vertical state. If the included angle between the axis line of the long bar 2 and the movement track line is in a non-vertical state, at this time the long bar 2 is in a skew state. During the forward movement of the skew long bar 2, when the inclined end of the skew long bar 2 contacts the window frame 1, the contact end of the long bar 2 is blocked by the window frame 1 and no longer moves along with the corresponding transmission belt 4, and the rotating roller 5.4 near the contact end rotates in the accommodation cavity 5.1 under the friction force of the transmission belt 4, thereby driving the coaxially fixed rod 5.23 to rotate coaxially. Then, under the meshing transmission of the first bevel gear 5.22 and the second bevel gear 5.24, the rotating roller 5.4 far from the contact end rotates in the opposite direction to the rotating roller 5.4 near the contact end, so that the rotating roller 5.4 far from the contact end rolls on the corresponding conveyor belt 4, thereby accelerating the recovery of the long bar 2 from the skew state to the normal state;

[0054] That is to say, by simply changing the rotation direction of the shaft rod 3.1, the unfolding, retracting of the louvre curtain and the angle adjustment of the louvre blades can be achieved. The whole process is simple and convenient. In addition, during the movement of the long bar 2 on the window frame 1, it also has a calibration function of self-balancing recovery, which has a multiple calibration effect on the state of the long bar 2, and can realize timely automatic calibration adjustment when the long bar 2 is skewed.

[0055] In another embodiment provided by the present invention, fixed pulleys 10 in contact with the belt body 4.1 are provided on both sides of the belt pulley 3.2. The wheel bodies of the fixed pulleys 10 are rotatably installed on the wall surface of the accommodation cavity 5.1. The axis line of the fixed pulley 10 is parallel to the axis line of the rotating roller 5.4, and the fixed pulley 10 can increase the contact area between the belt body 4.1 and the rotating roller 5.4.

[0056] Another embodiment provided by the present invention is that a track structure 11 is formed on the frame body of the window frame 1, and a plurality of sliding blade units 12 are slidably installed on the track structure 11. Each sliding blade unit 12 is fixedly corresponding to a blade of the louver curtain. The frame body of the window frame 1 can be a curved frame or a straight frame. When the window frame 1 is a straight frame, it can be arranged horizontally or vertically. When the window frame 1 is arranged horizontally, at this time, the louver curtain is also arranged horizontally on the window frame 1. At this time, each sliding blade unit 12 is fixedly corresponding to the top end of the blade of the louver curtain, so that the louver curtain can be suspended on the horizontally arranged window frame 1, which is convenient for the unfolding and retraction of the louver curtain.

[0057] Another embodiment provided by the present invention is that the belt pulley 3.2 includes an outer disc ring 3.21 that is drivingly adapted to the transmission belt 4. An inner disc body 3.22 fixed to the shaft rod 3.1 is adapted inside the outer disc ring 3.21. The inner disc body 3.22 and the outer disc ring 3.21 are drivingly engaged with each other through an elastic meshing tooth structure 3.23.

[0058] Specifically, the elastic meshing tooth structure 3.23 includes a plurality of insertion holes 3.231 formed on the circumferential surface of the inner disc body 3.22. A pin rod 3.232 is inserted and adapted in each insertion hole 3.231. One end of the pin rod 3.232 extends out of the outside of the insertion hole 3.231, and the other end of the pin rod 3.232 is elastically connected to the bottom of the insertion hole 3.231 through a spring 3.233. Each pin rod 3.232 forms a ring tooth structure on the circumferential surface of the inner disc body 3.22. A plurality of continuously distributed V-shaped grooves 3.234 are formed on the inner wall surface of the outer disc ring 3.21.

[0059] In actual use, under the elastic action of the spring 3.233, the protruding pin rod 3.232 is engaged with the corresponding V-shaped groove 3.234, so as to realize the power transmission between the inner disc body 3.22 and the outer disc ring 3.21. When the transmission resistance between the inner disc body 3.22 and the outer disc ring 3.21 is too large, the V-shaped groove 3.234 generates a component force along the axis of the pin rod 3.232, and the pin rod 3.232 moves towards the inside of the insertion hole 3.231, so that the spring 3.233 is compressed, so that the inner disc body 3.22 and the outer disc ring 3.21 rotate relatively, thus playing a role in protecting against torque overload.

[0060] Another embodiment provided by the present invention is that the above-mentioned louver curtain retracting and balancing mechanism is provided on the louver window. Therefore, only by changing the rotation direction of the shaft rod 3.1, the unfolding, retraction of the louver curtain and the angle adjustment of the blades of the louver curtain can be realized. The whole process is simple and convenient to operate. In addition, the long strip rod 2 also has a self-balancing and restoring correction effect during the movement on the window frame 1, which has a multiple calibration effect on the state of the long strip rod 2 and can realize timely automatic correction and adjustment when the long strip rod 2 is skewed. In addition, it can also play a role in protecting against torque overload of the shaft rotation of the shaft rod 3.1.

[0061] Only some exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A retractable balance mechanism for a louver blind, comprising a window frame (1) and a long strip rod (2) of the louver blind, characterized in that, Two parallel drive shaft units (3) are rotatably mounted in the window frame (1), two parallel drive belts (4) are connected for transmission between the two drive shaft units (3), and both ends of the rod body of the long rod (2) are vertically connected to the corresponding drive belt (4) through a correction component (5); The drive shaft unit (3) comprises a shaft (3.1) rotatably connected to the window frame (1), a belt reel (3.2) adapted for transmission with a corresponding transmission belt (4) being coaxially fixed on the rod body of the shaft (3.1), the correction assembly (5) comprises a receiving chamber (5.1) located inside the long bar (2), a shaft rod (5.2) being rotatably installed in the receiving chamber (5.1), a through opening (5.3) for the transmission belt (4) to pass through the receiving chamber (5.1) being provided on the long bar (2), a roller (5.4) being coaxially fixed on the shaft rod (5.2) in transmission contact with the transmission belt (4), a torsion rod (6) parallel to the long bar (2) being rotatably installed in the window frame (1), the torsion rod (6) and the shaft rod (5.2) being transmission-connected via a plurality of ladder rope groups (7), and the movement of the ladder rope group (7) being capable of driving the blades of the venetian blind to deflect; A first magnetic strip (8) is fixed on the rod body of the long rod (2), and a second magnetic strip (9) that is magnetically attracted to the first magnetic strip (8) is fixed on the window frame (1). When the blinds are fully unfolded, the first magnetic strip (8) and the second magnetic strip (9) are magnetically attracted to each other and fixed. The transmission belt (4) includes a belt body (4.1), and the belt body (4.1) is connected to the end of the belt body (4.2) to form a closed annular structure. A fixed pulley (10) in contact with the belt body (4.1) is provided on both sides of the belt reel (3.2), and the wheel body of each fixed pulley (10) is rotatably mounted on the wall of the accommodating cavity (5.1); The window frame (1) is provided with a track structure (11), a plurality of slide units (12) are slidably mounted on the track structure (11), each of the slide units (12) is fixed in one-to-one correspondence with a blade of the venetian blind, the shaft rod (5.2) comprises a sleeve (5.21) rotatably mounted in the accommodating cavity (5.1), a first bevel tooth (5.22) is rotatably mounted on the inner wall surface of the sleeve (5.21), a rod (5.23) is rotatably inserted at each end of the sleeve (5.21), a second bevel tooth (5.24) meshing with the first bevel tooth (5.22) is fixed at the end of each rod (5.23), and the roller (5.4) is coaxially fixed to the rod (5.23); The belt reel (3.2) comprises an outer disc ring (3.21) adapted for transmission with the transmission belt (4); an inner disc body (3.22) fixed to the shaft (3.1) is adapted inside the outer disc ring (3.21); the inner disc body (3.22) and the outer disc ring (3.21) are in transmission engagement via an elastic meshing tooth structure (3.23); The elastic meshing tooth structure (3.23) includes a plurality of insertion holes (3.231) formed on the circumferential surface of the inner disk body (3.22). A pin rod (3.232) is adaptively inserted into each of the insertion holes (3.231). One end of the pin rod (3.232) extends out of the insertion hole (3.231), and the other end of the pin rod (3.232) is elastically connected to the bottom of the insertion hole (3.231) through a spring (3.233). Each of the pin rods (3.232) forms a ring tooth structure on the circumferential surface of the inner disk body (3.22). A plurality of continuously distributed V-shaped grooves (3.234) are formed on the inner wall surface of the outer disk ring (3.21).

2. A kind of shutter, characterized in that, The louver is provided with the louver retracting and extending balance mechanism according to claim 1.

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