Series-type multi-roll blinds

Abstract

There is provided an in-line multi-roll blind, which includes a weight bar, a first screen connected at its lower end to the weight bar and at its upper end to a first take-up roll, the first screen being wound onto or unwound from the first take-up roll as the first take-up roll rotates, a first take-up bar having the first take-up roll rotatably coupled thereto, a second screen connected at its lower end to the first take-up bar and at its upper end to a second take-up roll, the second screen being wound onto or unwound from the second take-up roll as the second take-up roll rotates, and a second take-up bar having the second take-up roll rotatably coupled thereto.

Description

Technical Field

[0001] The present invention relates to a roll blind that rolls up or unfolds a screen for use, and more particularly, to a series-type multi-roll blind that can selectively or simultaneously apply at least two types of screens continuously connected to each other to one window.

Background Art

[0002] A blind device is one of the sunlight-blocking facilities installed on a window. Since the blind device is easier to operate and install than traditional curtains and shades, it is widely used not only in offices but also in homes.

[0003] Blind devices include various forms such as wooden blinds that adjust the angle of slats to block sunlight, combi blinds in the form of a double screen with alternating dark and light parts, and roll blinds equipped with roll screens that adjust the amount of light while being rolled up or unrolled. Also, improved blinds (for example, Korean Registered Patent No. 10-0866344, etc.) have been continuously developed.

[0004] However, such conventional blinds commonly have the following problems. Since the conventional structure covers the window to block sunlight, when reducing the amount of light, there is a problem that the window is shielded and the view outside the window cannot be seen.

[0005] On the other hand, when tinting the window, since sunlight is not completely blocked, there is a problem that it is necessary to separately use sunlight-blocking facilities such as blinds and curtains.

[0006] Furthermore, conventional blinds make it difficult to customize the operation of a single window, such as dividing it to block light in one section, tinting another, and allowing sunlight to pass through the other. This presents a problem in meeting the diverse needs of users, including such requests. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Korean Registered Patent No. 10-0866344 (October 31, 2008) [Overview of the project] [Problems that the invention aims to solve]

[0008] The technical problem of the present invention is to solve these problems and to provide a series-type multi-roll blind that allows for the selective or simultaneous application of at least two types of screens that are continuously connected to each other in a single window.

[0009] The technical problems of the present invention are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0010] The series-type multi-roll blind according to the present invention includes a weight bar, a first screen whose lower end is connected to the weight bar and whose upper end is connected to a first winding roll, and which is wound onto the first winding roll or unwound from the first winding roll by the rotation of the first winding roll, a first winding bar in which the first winding roll is rotatably coupled, a second screen whose lower end is connected to the first winding bar and whose upper end is connected to a second winding roll, and which is wound onto the second winding roll or unwound from the second winding roll by the rotation of the second winding roll, and a second winding bar in which the second winding roll is rotatably coupled.

[0011] The first winding bar may include a torsion spring connected to the first winding roll, which generates a first torque as it is compressed by the rotation of the first winding roll, and which counteracts a second torque generated in the opposite direction to the first torque by the loads of the first screen and the weight bar during the rotation.

[0012] The first screen can be automatically fixed in the unwinding or rewinding state by balancing the first torque and the second torque.

[0013] The system may further include a position fixing portion that is positioned on the weight bar and is formed to fix the weight bar to one side of the window frame.

[0014] The second winding bar may further include a rotational drive unit that applies rotational force to the second winding roll to adjust the positions of the second screen and the first winding bar.

[0015] The aforementioned rotary drive unit may include a remotely controllable drive motor.

[0016] The first screen and the second screen may have different light transmittances.

[0017] Either the first screen or the second screen may be formed of a translucent sheet that allows light transmission, and the other may be formed of an opaque sheet.

[0018] The translucent sheet may be a transparent film that has been tinting - processed to adjust the light transmittance.

[0019] The first screen may be formed of a translucent sheet, and the second screen may be formed of an opaque sheet.

Advantages of the Invention

[0020] According to the present invention, at least two types of screens continuously connected to one window can be applied to block sunlight or adjust the amount of light. According to the present invention, sunlight can be blocked with an opaque screen, and with a translucent screen, the scenery outside the window can be seen as it is while giving a tinting effect, and the screen itself can be completely rolled up so that sunlight can pass through the window as it is. Further, the present invention can also perform customized operations such as vertically partitioning one window with screens continuously connected to each other, shielding a part of the window, tinting a part, and allowing a part to transmit sunlight as it is. Therefore, the blind can be utilized in various ways and can meet the various requirements of different users in various situations.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view of the series - type multi - roll blind of the present invention. [Figure 2] It is a perspective view illustrating the operation of the roll blind of FIG. 1. [Figure 3] It is a partial cross - sectional view showing the internal structure of the first winding bar of the roll blind of FIG. 1. [Figure 4] It is a partial cross - sectional view showing the internal structure of the second winding bar of the roll blind of FIG. 1. [Figure 5]It is an operation diagram illustrating the operation of the second winding roll and the second screen of the roll blind in FIG. 1. [Figure 6] It is an operation diagram illustrating the operation of the first winding roll and the first screen of the roll blind in FIG. 1. [Figure 7] It is an operation diagram illustrating the operation of the first winding roll and the first screen of the roll blind in FIG. 1. [Figure 8] It is an operation diagram showing step by step the operation of the roll blind in FIG. 1 with the weight bar fixed.

Embodiments for Carrying Out the Invention

[0022] The advantages, features of the present invention, and the methods for achieving them will become clear by referring to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and can be realized in various different forms. These embodiments are merely provided to complete the disclosure of the present invention and to fully inform those with ordinary knowledge in the technical field to which the present invention belongs of the scope of the invention. The present invention is only defined by the claims. The same reference numerals throughout the specification refer to the same components.

[0023] Hereinafter, the serial multi-roll blind according to the present invention will be described in detail with reference to FIGS. 1 to 8.

[0024] FIG. 1 is a perspective view of the serial multi-roll blind of the present invention, and FIG. 2 is a perspective view illustrating the operation of the roll blind of FIG. 1.

[0025] Referring to FIG. 丨, in the serial multi-roll blind 1 (hereinafter, roll blind) according to the present invention, the first screen 101 and the second screen 201 are connected in series with the first winding bar 100 interposed therebetween (one screen is connected to the end of the other screen). Therefore, by rotating one winding roll (for example, the second winding roll 210), the two connected screens can be operated simultaneously.

[0026] However, the winding rolls that operate each screen (first winding roll 110 and second winding roll 210) are independent of each other, and therefore the areas of the first screen 101 and the second screen 201 can be adjusted independently. In other words, in addition to the state illustrated in Figure 1, the second screen 201 can be rolled up and only the first screen 101 can be deployed, or the first screen 101 can be rolled up and only the second screen 201 can be deployed, allowing for the arrangement of the first screen 101 and the second screen 201 to be adjusted as appropriate, or both screens can be rolled up to completely expose the window.

[0027] In particular, the first winding roll 110 generates a pair of torques in opposite directions during rotation, ensuring balance at all rotation angles, and allowing for easy operation even with small forces. For example, by pulling the lower end of the first screen 101 with a small external force (see Figure 6), or by fixing the lower end of the first screen 101 and pulling the upper end instead (see Figure 2), the first screen 101 is easily unfolded and automatically locked in place when the external force is removed.

[0028] With this configuration, as shown in Figure 2, the lower end of the first screen 101 (i.e., the weight bar 300) is fixed to the window frame B, and by pulling the second screen 201 with the second winding roll 210, it is possible to simultaneously change the area of ​​the first screen 101 and the second screen 201. Since the first screen 101 and the second screen 201 are made of materials with different light transmittances (for example, a translucent sheet and an opaque sheet), the screen area can be adjusted to achieve the light blocking effect of the opaque sheet and the tinting effect of the translucent sheet in a desired ratio.

[0029] The roll blind 1 of the present invention is configured as follows: The roll blind 1 of the present invention includes a weight bar 300, a first screen 101 whose lower end is connected to the weight bar 300 and whose upper end is connected to a first winding roll 110, and which is wound onto the first winding roll 110 or unwound from the first winding roll 110 by the rotation of the first winding roll 110, a first winding bar 100 in which the first winding roll 110 is rotatably coupled, a second screen 201 whose lower end is connected to the first winding bar 100 and whose upper end is connected to a second winding roll 210, and which is wound onto the second winding roll 210 or unwound from the second winding roll 210 by the rotation of the second winding roll 210, and a second winding bar 200 in which the second winding roll 210 is rotatably coupled.

[0030] In one embodiment of the present invention, the first winding bar 100 is connected to the first winding roll 110 and may include a torsion spring (see 110a in Figure 6) that is compressed by the rotation of the first winding roll 110 to generate a first torque (see T1 in Figure 6) and counteract a second torque (see T2 in Figure 6) generated in the opposite direction to the first torque by the load of the first screen 101 and the weight bar 300 during rotation.

[0031] As a result, the first screen 101 can be automatically fixed in the unwinding or rewinding state by the balance between the first torque and the second torque.

[0032] Furthermore, the first screen 101 and the second screen 201 may have different light transmittances, and either the first screen 101 or the second screen 201 may be formed from a light-transmitting translucent sheet, while the other is formed from an opaque sheet.

[0033] The configuration and effects of the present invention will be described in more detail below based on this embodiment of the present invention.

[0034] First, the structure of the roller blind will be explained in detail with reference to Figures 1 through 4.

[0035] Figure 3 is a partial cross-sectional view showing the internal structure of the first winding bar of the roll blind in Figure 1, and Figure 4 is a partial cross-sectional view showing the internal structure of the second winding bar of the roll blind in Figure 1.

[0036] As shown in Figure 1, the roll blind 1 of the present invention has a structure in which at least two screens are connected in series. The roll blind 1 of the present invention includes a weight bar 300 at the lowest end, a first screen 101 connected between the weight bar 300 and the first winding bar 100, and a second screen 201 connected between the first winding bar 100 and the second winding bar 200. In this embodiment, an example in which the first screen 101 and the second screen 201 are formed is described, but the screens, winding rolls and winding bars can be further expanded. For example, it is possible to place a third winding bar (not shown) on top of the second winding bar 200, form a third winding roll (not shown) inside the third winding bar, and connect a third screen (not shown) between the third winding roll and the second winding bar 200. Therefore, the technical concept of the present invention is not limited to this embodiment.

[0037] The structure of the present invention will be described below, starting from the bottom end.

[0038] Referring to Figures 1 and 2, the weight bar 300 is positioned at the lowest end of the roll blind 1. The weight bar 300 plays a role in deploying the first screen 101 by its own weight. As long as such action is possible, the weight bar 300 can be made of various materials and shapes. Therefore, the shape of the weight bar 300 shown is just one example.

[0039] Preferably, the weight bar 300 may be formed as a bar-shaped structure having a length corresponding to the width of the first screen 101 (width in the direction perpendicular to the direction in which the screen unfolds (direction of gravity)). In this embodiment, a position fixing portion 310 is formed on the weight bar 300.

[0040] As shown in Figure 2, the position fixing portion 310 is formed so that the weight bar 300 can be fixed to one side of the window frame B. For example, the position fixing portion 310 can be formed by a magnet embedded in the weight bar 300. The weight bar 300 can be fixed to an iron window frame B or the like by the magnetic force of the magnet. However, since the position fixing portion is deformable, it is not limited to this.

[0041] For example, the position fixing part 310 can also be formed using a clip, hook, or other connecting structure that can be detachably attached to the window frame B and gripped by the window frame.

[0042] As shown in Figure 1, the first screen 101 has its lower end connected to the weight bar 300 and its upper end connected to the first winding roll 110. This allows the screen to be wound onto (wind) or unwinded from (unwind) the first winding roll 110 by the rotation of the first winding roll 110. The first winding roll 110 is rotatably coupled inside the first winding bar 100.

[0043] The first screen 101 is formed such that its light transmittance differs from that of the second screen 201. Specifically, either the first screen 101 or the second screen 201 may be formed from a translucent sheet that allows light transmission, while the other may be formed from an opaque sheet (a material that obstructs the field of view). Preferably, as in this embodiment, the first screen 101 may be formed from a translucent sheet.

[0044] In this specification, an opaque sheet means a sheet made of a material that is substantially intransparent to sunlight (or other types of incident light), such as a textile, and that obstructs a person's field of vision. Because an opaque sheet obstructs the field of vision, a person cannot substantially see the outside scenery through it. On the other hand, a translucent sheet means a sheet made of a material that is substantially partially transparent to sunlight (or other types of incident light), such as a colored or coated light-transmitting film, and that does not obstruct a person's field of vision. Even if the transmittance of visible light and / or non-visible light (ultraviolet and infrared light) is adjusted by coloring and / or coating, a translucent sheet does not obstruct the field of vision, so a person can see the outside scenery through it.

[0045] Therefore, the first screen 101, which is made of a translucent sheet, is capable of transmitting light A. However, because it is translucent, the amount of light transmitted is regulated, thereby obtaining a normal tinting effect. Tinting as used herein means coloring and / or coating the surface of a light-transmitting material to adjust the amount of light in the material without obstructing the view. Therefore, tinting includes removing or reducing the amount of light of a specific wavelength without changing the color tone, such as with UV-blocking coatings. Tinting as used herein may be substantially the same as normal window tinting.

[0046] The translucent sheet applied to the first screen 101 may be, for example, a transparent film that has been tinted to adjust its light transmittance. The hue of the translucent sheet can be freely adjusted, and by adjusting the hue or the density of the coating, the light transmittance can also be freely changed. Therefore, even when the first screen 101 overlaps a window, the field of view is not obstructed, and only the transmittance or amount of light transmitted through the light A is reduced.

[0047] Figure 3 shows the internal structure of the first winding roll 110, which winds up and unwinds the first screen 101. Referring to Figure 3, the internal structure of the first winding bar 100 on which the first winding roll 110 is installed will be described.

[0048] As shown in Figure 3, the upper end of the first screen 101 is connected to the first winding roll 110. The upper end of the first screen 101 can be tightly fixed to the outer circumference of the first winding roll 110 in various ways (for example, by adhesive and / or by pressure fixing with fixing members). As a result, when the first winding roll 110 rotates, the first screen 101 is either wound onto the first winding roll 110 and pulled into the first winding bar 100, or unwound from the first winding roll 110 and discharged to the lower end of the first winding bar 100.

[0049] The first winding roll 110 is rotatably coupled inside the first winding bar 100. The first winding bar 100 may include a long, box-shaped first body 120 with an internal storage space, and first end caps 130 coupled to both ends of the first body 120. Both ends of the first winding roll 110 may be rotatably coupled to shafts formed in the first end caps 130.

[0050] An example of a method by which the first winding roll 110 is axially coupled to the first winding bar 100 is as follows. For example, rotating blocks 111 can be inserted at both ends of the first winding roll 110. The rotating block 111 has a hollow structure that allows an axis to pass through the center, and the first winding roll 110 can be axially coupled to the first end cap 130 via the rotating blocks 111 at both ends.

[0051] The shaft formed in the first end cap 130 can be deformed into various shapes as needed. Since a drive structure and the like can be arranged inside the winding roll, the shape and structure of the shaft can also be changed to correspond to that structure. For example, as in this embodiment, when the spring fixing shaft 113 connected to the first end cap 130 passes through the rotating block 111, the spring fixing shaft 113 can act as the rotating shaft of the first winding roll 110.

[0052] However, this is just one example, and in other embodiments, the shaft structure can also be modified to other forms. For example, at the other end of the first winding roll 110 where the spring-fixed shaft is not located, another shape of rotating shaft (not shown) can be formed, passing through the rotating block 111 and connected to the first end cap 130.

[0053] The first winding bar 100 includes a torsion spring 110a connected to the first winding roll 110. The torsion spring 110a can be located inside the first winding bar 100, and at least a portion of it may be inserted inside the first winding roll 110. Using a suitable structure, one end of the torsion spring 110a can be fixed to the first winding bar 100, and the other end can be configured to rotate together with the first winding roll 110.

[0054] The torsion spring 110a is connected to the first winding roll 110 and is compressed by the rotation of the first winding roll 110, generating a first torque (see T1 in Figure 6). The first winding roll 110 is paired with a second torque (see T2 in Figure 6) in the opposite direction due to the loads of the first screen 101 and the weight bar 300, but these are precisely adjusted and balanced (details are described below).

[0055] In other words, the torsion spring 110a of the first winding bar 100 is connected to the first winding roll 110 and generates a first torque as it is compressed by the rotation of the first winding roll 110, and cancels out a second torque generated in the opposite direction to the first torque by the load of the first screen 101 and the weight bar 300 during rotation. As a result, the first screen 101 can be automatically fixed in the unwinding or winding state by the balance between the first and second torques.

[0056] In other words, the torsion spring 110a of the first winding bar 100 is formed to precisely counteract the second torque, which increases or decreases according to the unwinding length of the first screen 101 (for example, an increase in the length of the first screen increases the load that the first screen applies to the first winding roll, and this increase in load also increases the torque acting on the first winding roll in the unwinding direction of the first screen (i.e., the second torque)), with a first torque generated in the opposite direction. Therefore, because it is fixed in any position by the balance of torques, the first screen 101 can be easily operated even with a small external force. A detailed explanation of this will be given later.

[0057] One end of the torsion spring 110a can be connected to the first end cap 130 to fix it in place and prevent rotation. For example, one end of the torsion spring 110a can be fixed with a spring fixing cap 112, and a spring fixing shaft 113 can be formed connecting the spring fixing cap 112 and the first end cap 130. The spring fixing shaft 113 can be formed by passing through the rotating block 111, as described above.

[0058] The other end of the torsion spring 110a is connected to the first winding roll 110 and rotates together with the first winding roll 110. Therefore, when the first winding roll 110 rotates, twisting occurs between the one end and the other end of the torsion spring 110a, generating a first torque. For example, the other end of the torsion spring 110a can be connected to the first winding roll 110 by coupling it with a fitting block 114 that is fixed inside the first winding roll 110 in a fitting manner.

[0059] The fitting block 114 is, for example, a cylindrical block with numerous blades or protrusions formed on its outer surface. The inner surface of the first winding roll 110 has a projection 110b that protrudes inward and extends in the longitudinal direction, which can be coupled to the blades or protrusions of the fitting block 114. This can be a type of coupling method using interlocking grooves, where the projection 110b is inserted between the blades or protrusions of the fitting block 114. Various coupling methods can be applied to connect the fitting block 114 to the first winding roll 110, thereby inducing twisting of the torsion spring 110a due to the rotation of the first winding roll 110.

[0060] Figure 3 shows an example where a single torsion spring 110a is applied, but it is also possible to distribute multiple torsion springs 110a at both ends of the first winding roll 110 to generate appropriate torque. In this case, the elasticity of the torsion springs 110a can be adjusted as appropriate considering the number of torsion springs 110a. In this manner, the first winding bar 100, to which the first winding roll 110 and the torsion springs 110a are connected, can be formed.

[0061] The second screen 201 is connected to the top of the first winding bar 100.

[0062] Referring to Figure 1, the second screen 201 is connected at its lower end to the first winding bar 100 and at its upper end to the second winding roll 210. Therefore, it is possible to wind the screen onto the second winding roll 210 (wind) or unwind it from the second winding roll 210 by the rotation of the second winding roll 210. The second winding roll 210 is rotatably coupled inside the second winding bar 200.

[0063] The lower end of the second screen 201 is fixed to the first body of the first winding bar 100 (see 120 in Figure 3) and is formed so as not to affect the rotation of the first winding roll 110.

[0064] The second screen 201 may be formed from an opaque sheet, as described above. The opaque sheet is not necessarily limited to this and may include, for example, a woven fabric. The opaque second screen 201 blocks light A, thereby obstructing the view when the second screen 201 overlaps the window. To enhance the light A blocking effect, the length of the second screen 201 can be extended by unwinding it from the second winding roll 210.

[0065] Figure 4 shows the internal structure of the second winding roll 210, which winds up and unwinds the second screen 201. Referring to Figure 4, the internal structure of the second winding bar 200 on which the second winding roll 210 is installed will be described.

[0066] As shown in Figure 4, the upper end of the second screen 201 is connected to the second winding roll 210. The upper end of the second screen 201 is tightly fixed to the outer circumference of the second winding roll 210 by various methods (e.g., adhesive and / or pressure fixing with fixing members). As a result, when the second winding roll 210 rotates, the second screen 201 is either wound onto the second winding roll 210 and pulled into the second winding bar 200, or unwound from the second winding roll 210 and discharged to the lower end of the second winding bar 200.

[0067] The second winding roll 210 is rotatably coupled inside the second winding bar 200. The coupling structure between the second winding roll 210 and the second winding bar 200 is the same as the coupling structure between the first winding roll 110 and the first winding bar 100 described above. The coupling structure between the second winding roll 210 and the second winding bar 200 will be described below with reference to the coupling structure between the first winding roll and the first winding bar described above.

[0068] The second winding bar 200 may include a long, hollow, box-shaped second body 220 and second end caps 230 coupled to both ends of the second body 220. Both ends of the second winding roll 210 may be rotatably coupled to shafts formed in the second end caps 230. The second winding bar 200 may be formed slightly larger than the first winding bar 100 to accommodate an opaque (the fabric may be relatively thick depending on the material) second screen 201.

[0069] An example of a method in which both ends of the second winding roll 210 are axially coupled to the second winding bar 200 is as follows. Rotating blocks 211 may be inserted into both ends of the second winding roll 210, and the rotating blocks 211 may have a hollow structure so that an axis can pass through the center. Therefore, the second winding roll 210 can be axially coupled to the second end cap 230 via the rotating blocks 211 at both ends.

[0070] The shaft formed in the second end cap 230 can be deformed into various shapes as needed. Since a drive structure and the like can be arranged inside the winding roll, the shape and structure of the shaft can also be changed to correspond to that structure. For example, as in this embodiment, when the motor fixing shaft 214 and the spring fixing shaft 218 are arranged to pass through the rotating blocks 211 at both ends, the motor fixing shaft 214 and the spring fixing shaft 218 can act as the rotating shafts of the second winding roll 210.

[0071] The second winding bar 200 may include a rotary drive unit 210a that applies rotational force to the second winding roll 210. The rotary drive unit 210a can apply rotational force to the second winding roll 210 and simultaneously adjust the position of the second screen 201 and the first winding bar 100 connected to the lower end of the second screen 201. Because the second winding bar 200 is positioned relatively high, the rotary drive unit 210a may be configured to be operated from a distance.

[0072] Preferably, the rotary drive unit 210a may include a remotely controllable drive motor 212. The drive motor 212 can be controlled, for example, by a wired or wireless remote control (not shown). A battery (not shown) for supplying power to the drive motor 212 may also be located on one side of the second winding bar 200.

[0073] However, the invention is not limited to this, and in other embodiments, the rotary drive unit may include other structures that can be operated from a distance (for example, an operating cord connected to the second winding roll via gears). A drive motor may also be positioned in parallel with it. The second winding roll 210 can be driven using a variety of drive structures.

[0074] The drive motor 212 can be connected to and fixed to the second end cap 230. For example, the body of the drive motor 212 can be connected to the motor fixing cap 213, and a motor fixing shaft 214 can be formed and fixed connecting the motor fixing cap 213 and the second end cap 230. As mentioned above, the motor fixing shaft 214 can pass through the rotating block 211.

[0075] The shaft of the drive motor 212 is connected to the second winding roll 210. Therefore, the rotational force of the drive motor 212 can be applied to the second winding roll 210. The shaft of the drive motor 212 can be connected to the second winding roll 210 by coupling it with a fitting block 215 that is fixed inside the second winding roll 210 in a fitting manner. The shaft of the drive motor 212 may be connected to a reduction gear capable of torque conversion, and such a reduction gear may be integrally formed with the drive motor 212.

[0076] On the other hand, the second winding roll 210 may have an auxiliary force generating unit 210b that stores elastic energy during rotation and assists rotation with the stored elastic energy. The auxiliary force generating unit 210b includes an elastic body and may have a shape similar to the aforementioned torsion spring, but it differs in that it is used to store a certain amount of elastic energy during rotation.

[0077] The auxiliary force generating section 210b may include an auxiliary spring 216, which may be formed to store elastic energy through torsion.

[0078] The auxiliary spring 216 has one end connected to the second end cap 230 to prevent rotation, and the other end connected to the second winding roll 210 to allow twisting. For example, a spring fixing cap 217 can be attached to one end of the auxiliary spring 216 to form a spring fixing shaft 218 connecting the spring fixing cap 217 and the second end cap 230. The spring fixing shaft 218 can pass through the rotating block 211. The other end of the auxiliary spring 216 can be connected to the second winding roll 210 by attaching a fitting block 219 that is fixed inside the second winding roll 210 in a fitting manner.

[0079] The mating blocks 215 and 219 applied to the auxiliary spring 216 and the drive motor 212 may be substantially the same in structure. Each mating block 215 and 219 has numerous blades or projections formed on the outer surface of a cylindrical block. The inner surface of the second winding roll 210 has a projection 210c that protrudes inward and extends in the longitudinal direction, which can be coupled to the blades or projections of each mating block 215 and 219. In this coupling method, one side of the drive motor 212 and one side of the auxiliary spring 216 can be connected to the second winding roll 210, respectively.

[0080] This structure makes it possible to form a series-type multi-roll blind 1 including a first winding bar 100, a second winding bar 200, and a first screen 101 and a second screen 201 connected between them.

[0081] Figure 5 is an operational diagram illustrating the operation of the second winding roll and the second screen of the roll blind shown in Figure 1, and Figures 6 and 7 are operational diagrams illustrating the operation of the first winding roll and the first screen of the roll blind shown in Figure 1.

[0082] According to the structure described above, the first and second screens can be operated as follows. First, referring to Figure 5, the unfolded length of the second screen 201 can be adjusted using the rotary drive unit 210a. As shown in Figure 5, when the aforementioned drive motor 212 is rotated in one direction to apply rotational force to the second winding roll 210, the second winding roll 210 can rotate and wind up the second screen 201. Figure 5 shows the operation of the second winding roll 210 winding up the second screen 201, but when the rotation direction of the drive motor 212 is changed to the opposite direction, the second screen 201 is unwound and its length increases.

[0083] Thus, the second winding bar 200 can be operated by a rotational drive unit 210a that actively applies rotational force to the second winding roll 210. When the second winding roll 210 rotates, the second screen 201 moves up and down, and the position of the first winding roll 110, which is connected to the lower end of the second screen 201, also changes.

[0084] Therefore, as shown in Figure 5, the second winding roll 210 can be rotated to simultaneously operate the second screen 201, the first winding bar 100, and the first screen 101 connected to the first winding bar 100. As will be described later, if the weight bar 300 at the end of the first screen 101 is not fixed separately, the second winding roll 210 can be driven in this way to raise and lower the first screen 101 and the second screen 201 simultaneously.

[0085] On the other hand, referring to Figures 6 and 7, the first screen 101 can be more easily operated using a pair of first torques T1 and T2 generated by the rotation of the first winding roll 110, which cancel each other out to balance the forces. As shown in Figure 6, even a light pull on the weight bar 300 at the lower end of the first screen 101 by hand C maintains the balance of torques, and the first screen 101 is easily unwound from the first winding roll 110. Even during unwinding, the pair of first torques T1 and T2 cancel each other out in opposite directions simultaneously, maintaining the balance of forces.

[0086] Therefore, the user does not need to continue pulling the weight bar 300 with their hand C. Once the first screen 101 has been unwound to the desired length, releasing hand C results in a state where there is virtually no external force due to the balance between the first torque T1 and the second torque T2, and the first screen 101 automatically locks in the unwound position.

[0087] The change in torque during operation of the first screen 101 is explained as follows: When unwinding, as shown in Figure 6(b), the length of the unwinded first screen 101 increases, so the second torque T2 acting downward on the first screen 101 increases. However, as shown in Figure 6(a), the torsion spring 110a is compressed by the same rotation, so the first torque T1 (due to the restoring force proportional to the compression of the torsion spring), which is generated in the opposite direction to the second torque T2, also increases simultaneously. Therefore, the first torque T1 cancels out the second torque T2, balancing the forces, and the first screen 101 automatically stops at the corresponding position.

[0088] Torque balance does not occur only at specific positions, but at all rotational angles in which the first winding roll 110 rotates. Therefore, changing positions only increases or decreases the magnitude of the torques that cancel each other out, and the first screen 101 automatically stops at any position.

[0089] The first torque T1 and the second torque T2 can be canceled out by the following principle.

[0090] The magnitude of the first torque T1 is proportional to the degree of compression of the torsion spring 110a, and the compression of the torsion spring 110a is proportional to the rotation angle of the first winding roll 110 (the angle at which the first winding roll 110 rotates around the center of rotation). Therefore, the first torque T1 is ultimately determined as the value obtained by multiplying the rotation angle by a specific proportionality constant. Generally, assuming that there is an initial torque value, this can be expressed as a linear equation: (rotation angle) × (first proportionality constant) + (initial first torque value).

[0091] On the other hand, the magnitude of the second torque T2 is the same as the torque of the first screen 101, which is obtained by multiplying the load that the first screen 101 applies to the side of the first winding roll 110 by the radius of the first winding roll 110 (corresponding to the torque arm) (this is a vector product, but since the first screen is pulled tangentially (perpendicular to the radius) on the side of the first winding roll, the value is the same as a normal multiplication), and adding the torque of the constant weight bar 300.

[0092] In this case, assuming that the width, density, and thickness of the first screen 101 and the radius of the first winding roll 110 are constants (these do not change substantially under normal circumstances), the load applied by the first screen 101 is proportional to the length of the first screen 101 that has been unwound (mass increases proportionally to length, and load increases proportionally to mass). Since the length of the first screen 101 that has been unwound (= (radius of the first winding roll) × (rotation angle)) in radians is also proportional to the rotation angle of the first winding roll 110, the second torque T2 can also be determined as a linear equation by multiplying the rotation angle by a specific proportionality constant and then adding a constant corresponding to the torque value of the weight bar. This can be expressed as (rotation angle) × (second proportionality constant) + (torque of weight bar).

[0093] More specifically, referring to the known torque formula for torsion spring 110a, the first torque T1 = (rotation angle) × ((wire diameter of the torsion spring)) 4 The first proportionality constant can be calculated using the formula: × (Young's modulus of the torsion spring) / (64 × (diameter of the torsion spring) × (number of turns of the torsion spring)) + (initial value of the first torque). Therefore, the first proportionality constant can be adjusted to the user's (manufacturer's) desired value by adjusting the wire diameter, Young's modulus, diameter, and number of turns of the torsion spring.

[0094] Furthermore, the second torque T2 = (torque of the first screen) + (torque of the weight bar), where (torque of the first screen) = (radius of the first winding roll) × (load of the unwound first screen), and (load of the unwound first screen) = (length of the unwound first screen) × (density of the first screen) × (width of the first screen) × (thickness of the first screen) × (acceleration due to gravity), and (length of the unwound first screen) = (angle of rotation) × (radius of the first winding roll), therefore the second torque T2 = (angle of rotation) × (radius of the first winding roll). 2 The second proportionality constant can be calculated using the formula: × (density of the first screen) × (width of the first screen) × (thickness of the first screen) × (acceleration due to gravity) + (torque of the weight bar). Therefore, the second proportionality constant can be adjusted to the user's (manufacturer's) desired value by adjusting the radius of the first winding roll and the density, width, and thickness of the first screen.

[0095] Furthermore, the torque of the weight bar (= (weight bar load) × (radius of the first winding roll)) is a constant value proportional to the weight bar load, so it can be adjusted to the user's (manufacturer's) desired value, and the initial value of the first torque can also be adjusted by using an appropriate torsion spring (all of the rotation angles mentioned above are the rotation angles of the first winding roll).

[0096] Therefore, the first torque T1 = (rotation angle) × (first proportionality constant) + (initial value of the first torque) and the second torque T2 = (rotation angle) × (second proportionality constant) + (torque of the weight bar) can be expressed as linear functions of the rotation angle of the first winding roll 110, and the first proportionality constant, second proportionality constant, torque of the weight bar, and initial value of the first torque can also be adjusted to desired values. Thus, by adjusting the first proportionality constant, second proportionality constant, torque of the weight bar, and initial value of the first torque, the above-mentioned manufacturing variables (wire diameter, power factor, diameter, number of turns of the torsion spring, radius of the first winding roll, density, width, thickness of the first screen, load of the weight bar, and initial value of the first torque) can be adjusted to appropriate values ​​so that the equation T1 = T2 holds.

[0097] By adjusting several variables in this manner, it is possible to make the first torque T1 and the second torque T2 cancel each other out to substantially equal magnitudes across all rotation angles.

[0098] In this case, the first and second proportionality constants correspond to the slopes of the aforementioned linear functions. Therefore, by matching the first and second proportionality constants, the increase ratio of the first torque T1 (with respect to the rotation angle) and the increase ratio of the second torque T2 (with respect to the rotation angle) become equal, allowing for a more precise matching of the first torque T1 and the second torque T2 when the rotation angle fluctuates. Furthermore, the torque of the weight bar can be used as a kind of initial value for the second torque to adjust the starting values ​​of the first torque T1 and the second torque T2 to match.

[0099] In this manner, the first torque T1 and the second torque T2 can be made to match regardless of the rotation angle of the first winding roll 110. Therefore, in any case, whether the first screen 101 is unwound as shown in Figure 6 or wound up as shown in Figure 7, the first torque T1 can cancel out the second torque T2, causing it to stop naturally in that state.

[0100] However, when the first screen 101 is pushed upward and wound up as shown in Figure 7, the only difference is that the unwound length of the first screen 101 decreases, reducing the load applied to the first screen 101, and consequently the magnitude of the second torque T2 decreases. The reduction in the rotation angle of the first winding roll 110 causes the torsion spring 110a to relax, and the magnitude of the first torque T1 that counteracts the second torque T2 decreases accordingly.

[0101] Therefore, the user can easily unwind the first screen 101 from or wind it onto the first winding roll 110 by applying only a small external force. Furthermore, since the first screen 101 is automatically fixed in place at all adjusted points by torque balance, no separate fixing mechanism is required.

[0102] According to the present invention, using such a structure, it is also possible to automatically change the ratio between the first screen 101 and the second screen 201 while the weight bar 300 is fixed as follows. Below, an example of the operation with the weight bar fixed will be described with reference to Figure 8.

[0103] Figure 8 is an operation diagram showing the step-by-step operation of the roll blind shown in Figure 1 with the weight bar fixed in place.

[0104] Referring to Figure 8, the weight bar 300 can be fixed to the window frame B using the position fixing part 310 described above. However, if the position fixing part is not available, the operation described later can be performed by placing a heavy object on the weight bar 300 or by having a person hold the weight bar 300.

[0105] For example, as shown in Figure 8(a), the weight bar 300 can be fixed first, and the second screen 201 can be wound out longer than the first screen 101. This initial state is just one example for illustrative purposes and does not need to be understood in a restrictive way.

[0106] In this state, when the second winding roll 210 is driven as shown in Figure 8(b), the second screen 201 is unwound, and the first winding bar 100 rises accordingly. At this time, since the weight bar 300 is fixed, the higher the first winding bar 100 rises, the wider the first screen 101 is unfolded.

[0107] In other words, by fixing the weight bar 300 and driving the second winding roll 210, the unfolded length of the second screen 201 decreases while the unfolded length of the first screen 101 increases. Even in this case, the first torque T1 and the second torque T2 increase by the same magnitude in all states where the first screen 101 is unfolded or wound up, canceling each other out and maintaining balance. Therefore, the unfolded length of the first screen 101 is maintained as is.

[0108] Therefore, as shown in Figure 8(c), the first winding bar 100 can be raised, or as shown in Figure 8(a), the first screen 101 can be adjusted to different lengths by lowering the first winding bar 100. Since the second winding roll 210 is driven by the aforementioned rotary drive unit, the ratio of the first screen 101 and the second screen 201 can be changed simultaneously by adjusting the rotary drive unit while the weight bar 300 is fixed.

[0109] As a result, as shown in Figure 8(a), the area of ​​the second screen 201 that overlaps with the window can be expanded, allowing the second screen 201, made of an opaque sheet, to block light A entering the window. Also, as shown in Figure 8(c), the area of ​​the first screen 101 that overlaps with the window can be expanded, reducing the amount of light using the first screen 101, made of a translucent sheet, while still allowing the view of the outside scenery. Furthermore, as shown in Figure 8(b), by adjusting the areas of the first screen 101 and the second screen 201 in an appropriate ratio, it is possible to maintain the appropriate amount of natural light desired by the user.

[0110] Furthermore, without limitation, by driving the second winding roll 210 after separating the weight bar 300 from the window frame B, the first screen 101 and the second screen 201 can be raised and lowered simultaneously, allowing a portion of the window to be completely exposed. Also, whether the second screen 201 is fixed or movable, the first screen 101 can be operated at any time with a simple touch, allowing the user to increase or decrease its length by manipulating the first screen 101 at the desired time. In this manner, the blinds can be used in various ways to meet the diverse needs of users in various situations.

[0111] While embodiments of the present invention have been described above with reference to the attached drawings, those with ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without altering its technical idea or essential features. Therefore, the above embodiments should be understood to be illustrative and not limiting in all respects. [Industrial applicability]

[0112] This invention allows for blocking or adjusting the amount of sunlight by applying at least two types of continuously connected screens to a single window. Furthermore, it is possible to block sunlight using opaque screens, view the scenery outside the window while providing a tinting effect using translucent screens, or completely roll up the screens to allow sunlight to pass through. In addition, by vertically dividing a single window using continuously connected screens, customized operations can be achieved, such as blocking part of the window, tinting part of it, and allowing sunlight to pass through part of it. Since these effects can be obtained by applying this invention to buildings with windows, it is possible to obtain a variety of effects, including the aforementioned effects, by applying this invention to buildings of any use, whether workspaces or living spaces. Therefore, this invention can be used in all kinds of industries related to buildings and the spaces within buildings, and can be said to have high industrial applicability. [Explanation of symbols]

[0113] 1. Series-type multi-roll blinds 100 First winding bar 101 Screen 1 110 First winding roll 110a Torsion Spring 110b,210c protrusion 111,211 Rotating Blocks 112,217 Spring fixing cap 113,218 Spring fixing shaft 114,215,219 Interlocking blocks 120 Main body 130 First End Cap 200 Second winding bar 201 Screen 2 210 Second winding roll 210a Rotary drive unit 210b Auxiliary force generation section 212 Drive motor 213 Motor fixing cap 214 Motor fixed shaft 216 Auxiliary spring 220 Second Main Body 230 Second End Cap 300 Weight Bar 310 Position fixing part T1 First Torque T2 Second Torque A Light B Window frame C hand

Claims

1. Weight bar and The lower end of the first screen is connected to the weight bar, and the upper end of the first winding roll is connected to the first winding roll, and the first screen is either wound onto the first winding roll or unwound from the first winding roll by the rotation of the first winding roll, The first winding bar, in which the first winding roll is rotatably coupled internally, The lower end of the second screen is connected to the first winding bar, and the upper end of the second winding roll is connected to the second winding roll, and the second screen is either wound onto the second winding roll or unwound from the second winding roll by the rotation of the second winding roll, The second winding roll is rotatably coupled to a second winding bar, A series multi-roll blind comprising a first winding bar connected to the first winding roll, which generates a first torque as it is compressed by the rotation of the first winding roll, and includes a torsion spring that counteracts a second torque generated in the opposite direction to the first torque by the loads of the first screen and the weight bar during the rotation.

2. The series-type multi-roll blind according to claim 1, wherein the first screen is automatically fixed in an unrolled or retracted state by the balance between the first torque and the second torque.

3. The serial multi-roll blind according to claim 2, further comprising a position fixing portion arranged on the weight bar and formed so as to be fixable to one side of the window frame.

4. The series-type multi-roll blind according to claim 3, wherein the second winding bar further includes a rotational drive unit that applies rotational force to the second winding roll to adjust the positions of the second screen and the first winding bar.

5. The series-type multi-roll blind according to claim 4, wherein the rotational drive unit includes a remotely controllable drive motor.

6. The series-type multi-roll blind according to claim 1, wherein the first screen and the second screen have different light transmittances.

7. The serial multi-roll blind according to claim 6, wherein either the first screen or the second screen is formed of a light-transmitting translucent sheet, and the other is formed of an opaque sheet.

8. The series-type multi-roll blind according to claim 7, wherein the translucent sheet is a transparent film that has been tinted to adjust its light transmittance.

9. The serial multi-roll blind according to claim 7, wherein the first screen is formed of a translucent sheet and the second screen is formed of an opaque sheet.

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