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 roller blind in which the screen is wound up or unfolded, and more particularly to a serial multi-roller blind in which at least two types of screens connected in series to each other can be applied selectively or simultaneously to a single window. [Background technology]

[0002] Blinds are a type of sun-blocking device installed on windows. They are widely used in homes as well as offices because they are easier to operate and install than traditional curtains or shades.

[0003] Blind devices come in a variety of forms, including wooden blinds that block sunlight by adjusting the angle of the slats, combination blinds with a double screen configuration with intersecting dark and light sections, and roller blinds with a roller screen that adjusts the amount of light by winding up and unwinding on a roll. Improved blinds (e.g., Korean Patent Registration No. 10-0866344) are also being continuously developed.

[0004] However, these conventional blinds have the following common problem: Because the conventional structure covers the window to block sunlight, when reducing the amount of light, the window is blocked, making it impossible to see the scenery outside the window.

[0005] However, when tinting windows, sunlight is not completely blocked, so there is a problem that additional sun-blocking equipment such as blinds or curtains must be used.

[0006] Furthermore, conventional blinds have the problem that it is difficult to customize the operation of a single window, such as dividing it into sections to block light, sections to be tinted, and sections to allow sunlight to pass through, making it difficult to meet the diverse needs of users, including these needs. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent No. 10-0866344 (October 31, 2008) Summary of the Invention [Problem to be solved by the invention]

[0008] The technical object of the present invention is to solve these problems and to provide a series-type multi-roll blind that can selectively or simultaneously apply at least two types of screens that are connected in series to one 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 in-line multi-roll blind according to the present invention includes a weight bar, a first screen having a lower end connected to the weight bar and an upper end connected to a first winding roll, the first screen being wound onto or unwound from the first winding roll as the first winding roll rotates, a first winding bar having the first winding roll rotatably coupled thereto, a second screen having a lower end connected to the first winding bar and an upper end connected to a second winding roll, the second screen being wound onto or unwound from the second winding roll as the second winding roll rotates, and a second winding bar having the second winding roll rotatably coupled thereto.

[0011] The first winding bar may include a torsion spring connected to the first winding roll, compressed by rotation of the first winding roll to generate a first torque, and offsetting a second torque generated in an opposite direction to the first torque by a load of the first screen and the weight bar during the rotation.

[0012] The first screen can be automatically fixed in an unwound state or a wound state by the balance between the first torque and the second torque.

[0013] The window frame may further include a position fixing portion disposed on the weight bar and configured to fix the weight bar to one side of the window frame.

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

[0015] The rotary drive 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 capable of transmitting light, and the other may be formed of an opaque sheet.

[0018] The translucent sheet may be a transparent film that has been tinted to adjust light transmittance.

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

[0020] According to the present invention, at least two types of screens connected in series to a single window can be used to block sunlight or adjust the amount of light. According to the present invention, the opaque screen can block sunlight, the translucent screen can provide a tinting effect while allowing the view outside the window to be seen, or the screen itself can be fully rolled up to allow sunlight to pass through the window. Furthermore, the present invention also allows for customized operation by vertically dividing a single window with screens connected in series, such as blocking some of the window, tinting some, and allowing sunlight to pass through some. Therefore, blinds can be used in a variety of ways to meet the needs of various users in a variety of situations. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of a series-type multi-roll blind according to the present invention. [Figure 2] 2A to 2C are perspective views illustrating the operation of the roller blind of FIG. 1. [Figure 3] FIG. 2 is a partial cross-sectional view showing the internal structure of a first winding bar of the roller blind of FIG. 1. [Figure 4] FIG. 2 is a partial cross-sectional view showing the internal structure of a second winding bar of the roller blind of FIG. 1. [Figure 5]2 is an operational diagram illustrating the operation of the second winding roll and the second screen of the roller blind of FIG. 1. FIG. [Figure 6] 2 is an operational diagram illustrating the operation of the first winding roll and the first screen of the roller blind of FIG. 1. FIG. [Figure 7] 2 is an operational diagram illustrating the operation of the first winding roll and the first screen of the roller blind of FIG. 1. FIG. [Figure 8] 2 is an operation diagram showing the operation of the roller blind of FIG. 1 in stages with the weight bar fixed. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] The advantages and features of the present invention, as well as methods for achieving them, will become clearer with reference to the following detailed embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and can be realized in various different forms. The present embodiments are provided merely to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art to which the present invention pertains. The present invention is defined solely by the claims. The same reference symbols refer to the same elements throughout the specification.

[0023] The in-line multi-roll blind according to the present invention will be described in detail below with reference to FIGS.

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

[0025] Referring to Figure 1, in a serial type multi-roller blind 1 (hereinafter referred to as a roll blind) according to the present invention, a first screen 101 and a second screen 201 are connected in series (one screen is connected to the other screen) with a first winding bar 100 in between. Therefore, by rotating one winding roll (e.g., the second winding roll 210), the two connected screens can be operated simultaneously.

[0026] However, the take-up rolls (first take-up roll 110 and second take-up roll 210) that operate each screen are independent of each other, and therefore the areas of the first screen 101 and the second screen 201 can be adjusted independently. That is, in addition to the state illustrated in Fig. 1, the second screen 201 can be rolled up and used with only the first screen 101 unfolded, or the first screen 101 can be rolled up and used with only the second screen 201 unfolded, and it is possible to adjust and position the ratio of the first screen 101 and the second screen 201 as appropriate, or to roll up both screens to completely expose the window.

[0027] In particular, when the first winding roll 110 rotates, a pair of torques are generated in opposite directions, which is balanced at all rotation angles, making it easy to operate even with a small force. For example, if the bottom end of the first screen 101 is pulled with a small external force (see FIG. 6), or if the bottom end of the first screen 101 is fixed and the top end is pulled conversely (see FIG. 2), the first screen 101 will easily unfold and automatically fix in that state when the external force is removed.

[0028] 2, the areas of the first screen 101 and the second screen 201 can be changed simultaneously by fixing the lower end of the first screen 101 (i.e., the weight bar 300) to the window frame B and pulling the second screen 201 with the second winding roll 210. Because the first screen 101 and the second screen 201 are made of materials with different light transmittances (e.g., a translucent sheet and an opaque sheet), the area of ​​the screens can be adjusted to achieve a desired ratio of the blocking effect of light A by the opaque sheet and the tinting effect by the translucent sheet.

[0029] The roller blind 1 of the present invention is configured as follows: The roller blind 1 of the present invention includes a weight bar 300, a first screen 101 connected at its lower end to the weight bar 300 and at its upper end to a first take-up roll 110, and being wound onto or unwound from the first take-up roll 110 as the first take-up roll 110 rotates, a first winding bar 100 having the first winding roll 110 rotatably coupled thereto, a second screen 201 connected at its lower end to the first winding bar 100 and at its upper end to a second winding roll 210, and being wound onto or unwound from the second take-up roll 210 as the second take-up roll 210 rotates, and a second winding bar 200 having the second winding roll 210 rotatably coupled thereto.

[0030] In one embodiment of the present invention, the first winding bar 100 may include a torsion spring (see 110a in FIG. 6) connected to the first winding roll 110 and compressed by the rotation of the first winding roll 110 to generate a first torque (see T1 in FIG. 6) to offset a second torque (see T2 in FIG. 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 unwound or wound state by the balance between the first torque and the second torque.

[0032] In addition, the first screen 101 and the second screen 201 may have different light transmittances, and one of the first screen 101 and the second screen 201 may be formed from a translucent sheet that allows light to pass through, while the other may be formed from an opaque sheet.

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

[0034] First, the structure of the roller blind will be described in detail with reference to FIGS.

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

[0036] As shown in FIG. 1, the roller blind 1 of the present invention has a structure in which at least two screens are connected in series. The roller blind 1 of the present invention includes a lowermost weight bar 300, a first screen 101 connected between the weight bar 300 and a first winding bar 100, and a second screen 201 connected between the first winding bar 100 and a 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, a third winding bar (not shown) can be placed on the second winding bar 200, a third winding roll (not shown) can be formed inside the third winding bar, and the third screen (not shown) can be connected 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.

[0038] 1 and 2, the weight bar 300 is disposed at the bottom of the roller blind 1. The weight bar 300 serves to unfold the primary screen 101 by its own weight. As long as it is capable of performing this function, the weight bar 300 can be made of various materials and have various shapes. Therefore, the shape of the weight bar 300 shown in the drawings is merely an example.

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

[0040] As shown in Fig. 2, the position fixing part 310 is formed to fix the weight bar 300 to one side of the window frame B. For example, the position fixing part 310 may be formed of a magnet built into the weight bar 300. The weight bar 300 can be fixed to the iron window frame B by the magnetic force of the magnet. However, the position fixing part is not limited to this because it is deformable.

[0041] For example, the position fixing part 310 may be formed using a clip, a hook, or other connecting structure that can be detachably connected to the window frame B, which can be held by the window frame.

[0042] 1, the first screen 101 has a lower end connected to the weight bar 300 and an upper end connected to the first take-up roll 110. As a result, the first screen 101 can be wound onto or unwound from the first take-up roll 110 as the first take-up roll 110 rotates. The first take-up roll 110 is rotatably coupled to the inside of the first take-up bar 100.

[0043] The first screen 101 is formed to have a different light transmittance from the second screen 201. Specifically, one of the first screen 101 and the second screen 201 may be formed from a translucent sheet that allows light to pass through, and the other may be formed from an opaque sheet (a material that blocks view). Preferably, the first screen 101 may be formed from a translucent sheet, as in this embodiment.

[0044] In this specification, an opaque sheet refers to a sheet made of a material, such as a fabric, that is substantially impermeable to sunlight (or other types of incident light) and blocks a person's view. An opaque sheet blocks the view, so a person cannot substantially see the outside scenery through the opaque sheet. On the other hand, a translucent sheet refers to a sheet made of a material, such as a colored or coated light-transmitting film, that substantially partially transmits sunlight (or other types of incident light) and does not block a person's view. A translucent sheet does not block a view even when the transmittance of visible light and / or non-visible light (ultraviolet and infrared) is adjusted by coloring and / or coating, so a person can see the outside scenery through the translucent sheet.

[0045] Therefore, the first screen 101, which is made of a translucent sheet, can transmit light A. However, because it is translucent, the amount of light transmitted is adjusted, thereby achieving a typical tinting effect. In this specification, tinting refers to coloring and / or coating the surface of a light-transmitting material to adjust the amount of light transmitted through the material without obstructing the view. Therefore, tinting includes removing or reducing the amount of light transmitted through a specific wavelength without changing the color tone, such as with UV-blocking coatings. In this specification, tinting may have substantially the same meaning as typical 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 color of the translucent sheet can be freely adjusted, and the light transmittance can also be freely changed by adjusting the color or coating density. Therefore, even if the first screen 101 overlaps a window, the field of view is not obstructed, and only the transmittance or amount of light transmitted by the light A is reduced.

[0047] 3 shows the internal structure of the first winding roll 110 that winds and unwinds the first screen 101. The internal structure of the first winding bar 100 on which the first winding roll 110 is installed will be described with reference to FIG.

[0048] 3, the upper end of the first screen 101 is connected to the first take-up roll 110. The upper end of the first screen 101 may be closely fixed to the outer periphery of the first take-up roll 110 in various ways (e.g., adhesive and / or pressure fixing using a fixing member). As a result, when the first take-up roll 110 rotates, the first screen 101 is taken up by the first take-up roll 110 and drawn into the first take-up bar 100, or is unwound from the first take-up roll 110 and discharged to the lower end of the first take-up bar 100.

[0049] The first take-up roll 110 is rotatably coupled to the inside of the first take-up bar 100. The first take-up 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 take-up roll 110 may be rotatably coupled to shafts formed on the first end caps 130.

[0050] An example of a method for axially connecting the first take-up roll 110 to the first take-up bar 100 is as follows. For example, a rotation block 111 may be inserted into both ends of the first take-up roll 110. The rotation block 111 has a hollow structure so that a shaft can pass through the center, and the first take-up roll 110 may be axially connected to the first end cap 130 via the rotation blocks 111 on both ends.

[0051] The shaft formed on the first end cap 130 can be modified into various shapes as needed. Because a drive mechanism and the like can be disposed inside the take-up roll, the shape and structure of the shaft can be changed to correspond to the structure. For example, as in this embodiment, when the spring fixing shaft 113 connected to the first end cap 130 passes through the rotation block 111, the spring fixing shaft 113 can function as the rotation shaft of the first take-up roll 110.

[0052] However, this is merely an example, and the shaft structure may be modified in other ways in other embodiments. For example, a differently shaped rotation shaft (not shown) may be formed at the other end of the first take-up roll 110 where the spring fixing shaft is not disposed, passing through the rotation block 111 and connected to the first end cap 130.

[0053] The first take-up bar 100 includes a torsion spring 110a connected to the first take-up roll 110. The torsion spring 110a may be disposed inside the first take-up bar 100, and at least a portion of the torsion spring 110a may be inserted inside the first take-up roll 110. Using an appropriate structure, one end of the torsion spring 110a may be fixed to the first take-up bar 100, and only the other end may be formed to rotate together with the first take-up 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 FIG. 6). A second torque (see T2 in FIG. 6) in the opposite direction is generated in the first winding roll 110 in a pair by the loads of the first screen 101 and the weight bar 300, and these torques are precisely adjusted to be balanced (details will be described below).

[0055] That is, the torsion spring 110a of the first winding bar 100 is connected to the first winding roll 110 and is compressed by the rotation of the first winding roll 110, thereby generating a first torque, which cancels out a second torque that is generated in the opposite direction to the first torque due to 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 state or the winding state due to the balance between the first torque and the second torque.

[0056] That is, the torsion spring 110a of the first winding bar 100 is formed to precisely offset the second torque, which increases or decreases according to the unwound length of the first screen 101 (for example, as the length of the first screen increases, the load that the first screen applies to the first winding roll increases, and as the load increases, the torque (i.e., the second torque) acting on the first winding roll in the unwound direction of the first screen also increases), with the first torque generated in the opposite direction. Therefore, since the first screen 101 can be fixed at any position due to the balance of torque, it can be easily operated even with a small external force. This will be described in detail later.

[0057] One end of the torsion spring 110a may be connected to the first end cap 130 to prevent it from rotating. For example, one end of the torsion spring 110a may be fixed by a spring fixing cap 112, and a spring fixing shaft 113 may be formed to connect the spring fixing cap 112 and the first end cap 130. The spring fixing shaft 113 may be formed to pass through the rotation block 111 as described above.

[0058] The other end of the torsion spring 110a is connected to the first take-up roll 110 and rotates together with the first take-up roll 110. Therefore, when the first take-up roll 110 rotates, a torsion occurs between 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 may be connected to the first take-up roll 110 by engaging a fitting block 114 that is fixed inside the first take-up roll 110 in a fitting manner.

[0059] The mating block 114 is, for example, a cylindrical block with a number of blades or protrusions formed on the outer surface thereof. The first winding roll 110 has a protrusion 110b formed on the inner surface thereof that protrudes inward and extends in the longitudinal direction, and can be coupled to the blades or protrusions of the mating block 114. This may be a type of concave-convex coupling method in which the protrusion 110b is inserted between the blades or protrusions of the mating block 114. Various coupling methods may be used to couple the mating block 114 to the first winding roll 110, and torsion of the torsion spring 110a may be induced by rotation of the first winding roll 110.

[0060] 3 shows an example in which a single torsion spring 110a is applied, but in order to generate an appropriate torque, multiple torsion springs 110a may be distributed and disposed on both ends of the first take-up roll 110. In this case, the elasticity of the torsion springs 110a may be adjusted appropriately in consideration of the number of torsion springs 110a. In this manner, the first take-up bar 100 in which the first take-up roll 110 and the torsion springs 110a are connected may be formed.

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

[0062] 1, the second screen 201 has a lower end connected to the first winding bar 100 and an upper end connected to the second winding roll 210. Therefore, the second screen 201 can be wound onto or unwound from the second winding roll 210 as the second winding roll 210 rotates. The second winding roll 210 is rotatably coupled to the inside of the second winding bar 200.

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

[0064] As described above, the second screen 201 may be formed of an opaque sheet. 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, and therefore, when the second screen 201 overlaps a window, the view is blocked. To improve the effect of blocking light A, the length of the second screen 201 can be extended by unwinding the second screen 201 from the second winding roll 210.

[0065] 4 shows the internal structure of the second winding roll 210 that winds and unwinds the second screen 201. The internal structure of the second winding bar 200 on which the second winding roll 210 is installed will be described with reference to FIG.

[0066] 4, the upper end of the second screen 201 is connected to the second take-up roll 210. The upper end of the second screen 201 is closely fixed to the outer periphery of the second take-up roll 210 by various methods (for example, adhesive and / or pressure fixing using a fixing member). As a result, when the second take-up roll 210 rotates, the second screen 201 is taken up by the second take-up roll 210 and drawn into the second take-up bar 200, or is taken up from the second take-up roll 210 and discharged to the lower end of the second take-up bar 200.

[0067] The second winding roll 210 is rotatably coupled to the inside of the second winding bar 200. The coupling structure between the second winding roll 210 and the second winding bar 200 is similar to 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 on the second end caps 230. The second winding bar 200 may be slightly larger than the first winding bar 100 to accommodate the opaque second screen 201 (which may be made of a relatively thick fabric, depending on the material).

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

[0070] The shaft formed on the second end cap 230 can be modified into various shapes as needed. Because a drive mechanism and the like can be disposed inside the take-up roll, the shape and structure of the shaft can also be changed to correspond to the structure. For example, as in this embodiment, when the motor fixed shaft 214 and the spring fixed shaft 218 are disposed to pass through the rotation blocks 211 at both ends, the motor fixed shaft 214 and the spring fixed shaft 218 can function as the rotation shaft of the second take-up roll 210.

[0071] The second winding bar 200 may include a rotation driver 210a that applies a rotational force to the second winding roll 210. The rotation driver 210a applies a rotational force to the second winding roll 210 to simultaneously adjust the positions 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 located relatively high, the rotation driver 210a may be configured to be operable from a distance.

[0072] Preferably, the rotation drive unit 210a may include a remotely controllable drive motor 212. The drive motor 212 may 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 disposed on one side of the second winding bar 200.

[0073] However, this is not a limitation, and in other embodiments, the rotation drive unit can include other structures that can be operated from a remote location (for example, an operating string connected to the second take-up roll via a gear). A drive motor can also be arranged in parallel with this. The second take-up roll 210 can be driven using various types of drive structures.

[0074] The driving motor 212 may be connected and fixed to the second end cap 230. For example, the body of the driving motor 212 may be coupled to the motor fixing cap 213, and a motor fixing shaft 214 may be formed and fixed to connect the motor fixing cap 213 and the second end cap 230. As described above, the motor fixing shaft 214 may pass through the rotation block 211.

[0075] The shaft of the drive motor 212 is connected to the second take-up roll 210. Therefore, the rotational force of the drive motor 212 can be applied to the second take-up roll 210. The shaft of the drive motor 212 can be connected to the second take-up roll 210 by engaging a fitting block 215 that is fixed in a fitting manner inside the second take-up roll 210. The shaft of the drive motor 212 can be connected to a reducer capable of torque conversion, and the drive motor 212 can be integrally formed with such a reducer.

[0076] Meanwhile, an auxiliary force generator 210b may be further disposed on the second take-up roll 210 to store elastic energy during rotation and assist the rotation with the stored elastic energy. The auxiliary force generator 210b may have a shape similar to the torsion spring described above since it includes an elastic body, but differs in that it is used to store a certain amount of elastic energy during rotation.

[0077] The auxiliary force generating unit 210b may include an auxiliary spring 216, which may be configured to store elastic energy by torsion.

[0078] One end of the auxiliary spring 216 is connected to the second end cap 230 to prevent it from rotating, and the other end is connected to the second take-up roll 210 to allow it to twist. For example, a spring fixing cap 217 may be attached to one end of the auxiliary spring 216, and a spring fixing shaft 218 may be formed to connect the spring fixing cap 217 to the second end cap 230. The spring fixing shaft 218 may pass through the rotation block 211. The other end of the auxiliary spring 216 may be connected to the second take-up roll 210 by attaching a fitting block 219 that is fixed in a fitting manner inside the second take-up roll 210.

[0079] The engaging blocks 215, 219 applied to the auxiliary spring 216 and the drive motor 212 may have substantially the same structure. Each of the engaging blocks 215, 219 is a cylindrical block with a number of blades or protrusions formed on the outer surface. The inner surface of the second take-up roll 210 is formed with a protrusion 210c that protrudes inward and extends in the longitudinal direction, and can be coupled with the blades or protrusions of each of the engaging blocks 215, 219. In this coupling manner, one side of the drive motor 212 and one side of the auxiliary spring 216 can be connected to the second take-up roll 210, respectively.

[0080] With this structure, a serial multi-roll blind 1 can be formed, which includes a first winding bar 100, a second winding bar 200, and a first screen 101 and a second screen 201 connected between them.

[0081] FIG. 5 is an operational diagram illustrating the operation of the second winding roll and the second screen of the roller blind of FIG. 1, and FIGS. 6 and 7 are operational diagrams illustrating the operation of the first winding roll and the first screen of the roller blind of FIG. 1.

[0082] According to the above-described structure, the first screen and the second screen can be operated as follows. First, referring to FIG. 5, the unfolded length of the second screen 201 can be adjusted using the rotation drive unit 210a. As shown in FIG. 5, when the drive motor 212 is rotated in one direction to apply a rotational force to the second take-up roll 210, the second take-up roll 210 rotates and winds up the second screen 201. While FIG. 5 shows the operation of the second take-up roll 210 winding up the second screen 201, when the rotation direction of the drive motor 212 is reversed, the second screen 201 is unwound, increasing its length.

[0083] In this manner, the second winding bar 200 can be operated by a rotation driver 210a that actively applies a 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 connected to the lower end of the second screen 201 also changes.

[0084] 5, the second screen 201, the first winding bar 100, and the first screen 101 connected to the first winding bar 100 can be simultaneously operated by rotating the second winding roll 210. As will be described later, if the weight bar 300 at the end of the first screen 101 is not separately fixed, the first screen 101 and the second screen 201 can be simultaneously raised and lowered by driving the second winding roll 210 in this manner.

[0085] 6 and 7, the first screen 101 can be more easily operated using a pair of first torque T1 and second torque T2 that are generated by the rotation of the first winding roll 110 and that cancel each other out to maintain force balance. As shown in Fig. 6, the torque balance is maintained even by lightly pulling the weight bar 300 at the lower end of the first screen 101 with a hand C, and the first screen 101 is easily unwound from the first winding roll 110. Even during unwinding, the pair of first torque T1 and second torque T2 simultaneously cancel each other out in opposite directions, maintaining force balance.

[0086] Therefore, the user does not need to continue pulling the weight bar 300 with the hand C. When the user releases the hand C after unwinding the first screen 101 to the desired length, the balance between the first torque T1 and the second torque T2 results in a state where there is essentially no external force, and the first screen 101 is automatically fixed in the unwound state.

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

[0088] The torque balance does not occur only at a specific position, but occurs at all rotation angles of the first winding roll 110. Therefore, even if the position is changed, the magnitude of the torques that cancel each other out increases or decreases, and the first screen 101 automatically stops at any position.

[0089] The first torque T1 and the second torque T2 can be cancelled out based on 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 by which the first winding roll 110 rotates around its center of rotation). Therefore, the first torque T1 is determined as the rotation angle multiplied by a specific proportionality constant. Generally, assuming an initial torque value, this can be expressed as a linear equation: (rotation angle) × (first proportionality constant) + (first initial torque value).

[0091] On the other hand, the magnitude of the second torque T2 is equal to the torque of the first screen 101, which is the load applied by the first screen 101 from the side of the first winding roll 110 multiplied by the radius of the first winding roll 110 (which corresponds to the arm of the torque) (this is a vector product, but because the first screen is pulled in the tangential direction (direction perpendicular to the radius) at the side of the first winding roll, the value is the same as normal multiplication), plus the torque of the weight bar 300, which is a constant.

[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 in everyday situations), the load applied by the first screen 101 is proportional to the unwound length of the first screen 101 (mass increases in proportion to length, and load increases in proportion to mass). According to the radian method, the unwound length of the first screen 101 (= (radius of the first winding roll) × (rotation angle)) is also proportional to the rotation angle of the first winding roll 110. Therefore, 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 corresponding constant to the torque value of the weight bar. This can be expressed as (rotation angle) × (second proportionality constant) + (torque of the weight bar).

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

[0094] Furthermore, second torque T2 = (torque of first screen) + (torque of weight bar), but (torque of first screen) = (radius of first winding roll) × (load of unwound first screen), (load of unwound first screen) = (length of unwound first screen) × (density of first screen) × (width of first screen) × (thickness of first screen) × (acceleration of gravity), and (length of unwound first screen) = (angle of rotation) × (radius of first winding roll), so second torque T2 = (angle of rotation) × (radius of first winding roll). 2 × (density of the first screen) × (width of the first screen) × (thickness of the first screen) × (gravitational acceleration) + (torque of the weight bar). Therefore, the second proportionality constant can be adjusted to a value desired by the user (producer) by adjusting the radius of the first winding roll and the density, width, and thickness of the first screen.

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

[0096] Therefore, the first torque T1 = (rotation angle) × (first proportionality constant) + (initial value of first torque), and the second torque T2 = (rotation angle) × (second proportionality constant) + (torque of weight bar), and both the first torque T1 and the second torque T2 can be expressed as a linear function of the rotation angle of the first winding roll 110. The first proportionality constant, the second proportionality constant, the torque of the weight bar, and the initial value of first torque can also be adjusted to desired values, so that the first proportionality constant, the second proportionality constant, the torque of the weight bar, and the initial value of first torque can be adjusted to appropriate values ​​so that the equation first torque T1 = second torque T2 is established.

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

[0098] In this case, since the first proportionality constant and the second proportionality constant correspond to the slope of the linear function described above, matching the first proportionality constant and the second proportionality constant makes 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) equal, allowing the first torque T1 and the second torque T2 to be matched more precisely in situations where the rotation angle fluctuates. Also, the torque of the weight bar can be used as a kind of initial value of the second torque to adjust the starting values ​​of the first torque T1 and the second torque T2 so that they match.

[0099] In this manner, the first torque T1 and the second torque T2 can be made equal regardless of the rotation angle of the first winding roll 110. Therefore, in any case, whether the first screen 101 is in an unwound state as shown in FIG. 6 or in a wound state as shown in FIG. 7, the first torque T1 can cancel out the second torque T2, and the first screen 101 can be stopped naturally in the corresponding state.

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

[0101] Therefore, a user can easily unwind or wind the first screen 101 onto or from the first take-up roll 110 by applying only a slight external force. In addition, the first screen 101 is automatically fixed in position at every adjusted position due to torque balance, eliminating the need for a separate fixing mechanism.

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

[0103] FIG. 8 is an operation diagram showing the steps of operation of the roller blind of FIG. 1 with the weight bar fixed.

[0104] 8, the weight bar 300 can be fixed to the window frame B using the aforementioned position fixing part 310. However, if there is no position fixing part, the operation described below can be performed by placing a weight on the weight bar 300 or by a person holding 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 an example for the purpose of explanation, and does not need to be understood in a restrictive sense.

[0106] In this state, when the second take-up roll 210 is driven as shown in Figure 8(b), the second screen 201 is unwound, and the first take-up bar 100 also rises. At this time, since the weight bar 300 is in a fixed state, the more the first take-up bar 100 rises, the more widely the first screen 101 is deployed.

[0107] That is, when the weight bar 300 is fixed and the second winding roll 210 is driven, 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 amount when the first screen 101 is being unwound or wound, canceling each other out and maintaining a balance. Therefore, the unfolded length of the first screen 101 is maintained as it is.

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

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

[0110] Furthermore, without being limited thereto, by separating the weight bar 300 from the window frame B and driving the second winding roll 210, the first screen 101 and the second screen 201 can be raised and lowered at the same time, so that part of the window can be completely exposed. Furthermore, even if the second screen 201 is fixed or movable, the first screen 101 can be operated at any time with a simple touch, so the user can increase or decrease the length by operating the first screen 101 at a desired time. In this way, the blinds can be used in various ways according to the various needs of users in various situations.

[0111] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the above embodiments are illustrative in all respects and are not limiting. [Industrial Applicability]

[0112] The present invention can block sunlight or adjust the amount of light by applying at least two types of continuously connected screens to a single window. Furthermore, it is possible to use an opaque screen to block sunlight, a translucent screen to provide a tinting effect while allowing the view outside the window to be seen, or to fully roll up the screen to allow sunlight to pass through. Furthermore, by vertically dividing a single window using continuously connected screens, customized operations can be achieved, such as blocking part of the window, tinting part, and allowing sunlight to pass through part. Since these effects can be achieved by applying the present invention to buildings equipped with windows, various effects, including those mentioned above, can be achieved by applying the present invention to buildings for any purpose, whether it be a work space or a living space. Therefore, the present invention can be used in all kinds of industries related to buildings and the spaces within them, and is therefore highly applicable. [Explanation of symbols]

[0113] 1. Serial 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 fixed shaft 114,215,219 Mating Blocks 120 First Body 130 First end cap 200 Second winding bar 201 Screen 2 210 Second take-up roll 210a Rotation drive unit 210b Auxiliary force generation section 212 Drive motor 213 Motor fixing cap 214 Motor fixed shaft 216 Auxiliary spring 220 Second 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 a first screen having a lower end connected to the weight bar and an upper end connected to a first take-up roll, the first screen being wound onto the first take-up roll or unwound from the first take-up roll as the first take-up roll rotates; a first winding bar having the first winding roll rotatably coupled thereto; a second screen having a lower end connected to the first winding bar and an upper end connected to a second winding roll, the second screen being wound onto or unwound from the second winding roll as the second winding roll rotates; a second winding bar having the second winding roll rotatably coupled thereto;

2. The first winding bar is 2. The in-line multi-roll blind according to claim 1, further comprising 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 cancels out a second torque which is generated in an opposite direction to the first torque by the load of the first screen and the weight bar during the rotation.

3. The in-line multi-roll blind according to claim 2 , wherein the first screen is automatically fixed in an unrolled state or a rolled-up state by a balance between the first torque and the second torque.

4. The in-line multi-roll blind according to claim 3 , further comprising a position fixing portion disposed on the weight bar and configured to fix the weight bar to one side of a window frame.

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

6. 6. The in-line multi-roll blind according to claim 5, wherein the rotary drive unit includes a remotely controllable drive motor.

7. The in-line multi-roll blind according to claim 1 , wherein the first screen and the second screen have different light transmittances.

8. 8. The in-line multi-roll blind according to claim 7, wherein one of the first screen and the second screen is formed of a translucent sheet that allows light to pass through, and the other is formed of an opaque sheet.

9. The in-line multi-roll blind according to claim 8, wherein the translucent sheet is a transparent film that has been tinted to adjust light transmittance.

10. 9. The in-line multi-roller blind according to claim 8, wherein the first screen is formed of a translucent sheet, and the second screen is formed of an opaque sheet.

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