shielding device

Abstract

To provide a shielding device which is configured in such a manner of reducing frictional resistance generated between a shielding member and a lifting cord.SOLUTION: In a horizontal blind Bd, a lifting / lowering cord Cr capable of lifting / lowering a slat St suspended from and supported by a head box Bh is disposed at a position offset from the center of the slat St. The horizontal blind Bd includes a lifting / lowering drum 1d and a rotary drum receiver 21. The lifting / lowering drum 1d is rotatably accommodated in the head box Bh and is connected to the lifting / lowering cord Cr for winding / unwinding. The rotary drum receiver 21 is disposed below the lifting / lowering drum 1d and has a lifting / lowering cord insertion portion 211 for guiding the lifting / lowering cord Cr to outside of the head box Bh on at least one of the front surface side and the rear surface side.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a shading device, and more particularly to a structure of a shading device such as a horizontal blind in which a lift cord is disposed at a position offset from the center of the slat in the front-to-rear direction. [Background technology]

[0002] BACKGROUND ART Conventionally, horizontal blinds (shading devices) are known in which lifting cords are disposed at positions offset from the center of slats (shading materials) in the front-to-rear direction (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-252265 Summary of the Invention [Problem to be solved by the invention]

[0004] In the horizontal blind disclosed in Patent Document 1, at least one lifting cord is introduced into the head box from one side in the front-to-rear direction of the head box, and other lifting cords are introduced into the head box from the other side in the front-to-rear direction of the head box. All of the lifting cords introduced into the head box from different positions in the front-to-rear direction of the head box are wound in the same direction by rotating a lifting drum to which one end of each lifting cord is connected.

[0005] The horizontal blind of Patent Document 1 does not require the slats to have insertion holes through which the lifting cords are inserted, so light leakage from the insertion holes can be prevented when the slats are fully closed.

[0006] However, the horizontal blinds disclosed in Patent Document 1 have a drawback in that frictional resistance occurs between the slats and the lifting cord when the slats are raised or lowered. In particular, when the slats are designed to be able to be raised or lowered in a horizontal position, the frictional resistance between the ends of the slats and the lifting cord becomes significant.

[0007] There has been a demand for a shielding device that can reduce the frictional resistance that occurs between a shielding material such as a slat and a lift cord.

[0008] The present invention has been made in view of the above-mentioned problems, and has an object to provide a shielding device that can reduce the frictional resistance that occurs between the shielding material and the lifting cord. [Means for solving the problem]

[0009] The inventors believed that by configuring the lifting cord to swing outward relative to the shielding material, the frictional resistance that occurs between the shielding material and the lifting cord could be reduced, and based on this, they invented the following new shielding device.

[0010] (1) A shielding device according to the present invention is a shielding device in which a lifting cord capable of lifting and lowering a shielding material suspended from a head box is disposed at a position offset from the center of the shielding material in the front-to-rear direction, and the shielding device comprises: a lifting drum rotatably housed inside the head box and connected to the lifting cord so that the lifting cord can be wound and unwound; and a cord guide disposed below the lifting drum and having a lifting cord insertion portion on at least one of the front and rear sides for leading the lifting cord out of the head box. The lifting drum is rotatably supported by a lifting drum receiver, and the lifting drum receiver and the cord guide can be attached to the head box by assembling them together. .

[0011] (2) The lifting cord insertion portion is preferably formed in a wall portion standing on at least one of the front and rear sides of the cord guide.

[0012] (3) The lift-up cord insertion portion is preferably an opening through which the lift-up cord is led out to at least one of the front side and the rear side of the cord guide.

[0013] (4) At least a portion of the cord guide protrudes from the underside of the head box, and the lifting cord insertion portion is formed in the cord guide from above to below the underside of the head box, and it is preferable that the cord guide has a lifting cord hanging portion at a position below the underside of the head box, which hangs the lifting cord inserted through the lifting cord insertion portion downward.

[0014] (5) The shading device according to the present invention further comprises a rotating drum below the lifting drum, which connects ladder cords that align and support the shading material, which is the slats of a horizontal blind, and which can tilt the ladder cords by rotating the drum; the cord guide is a rotating drum support that rotatably supports the rotating drum and has a base portion on its underside on which a ladder cord insertion portion is formed that leads the ladder cords out of the head box.

[0015] (6) The base portion is formed so as to protrude from the underside of the head box and so that its front-to-rear end constitutes part of the lift cord insertion portion, and it is preferable that the lift cord is led out of the head box from the front-to-rear end of the base portion through the lift cord insertion portion.

[0016] (7) It is preferable that the width of the cord guide in the front-rear direction is smaller than the width of the shielding material.

[0017] (8) It is preferable that a plurality of the lifting drums and the cord guides are arranged along the longitudinal direction of the head box, and that the lifting cord hanging down from a first lifting drum among the plurality of lifting drums is led out of the head box from the front side of a first cord guide arranged below the first lifting drum, and that a second lifting cord hanging down from a second lifting drum among the plurality of lifting drums is led out of the head box from the rear side of a second cord guide arranged below the second lifting drum. (9) A shielding device in which a lifting cord capable of raising and lowering a shielding material suspended from a head box is arranged at a position offset from the center of the shielding material in the fore-and-aft direction, the shielding device comprising: a lifting drum rotatably housed inside the head box and connected to the lifting cord so that it can be wound and unwound; a cord guide arranged below the lifting drum and having a lifting cord insertion portion on at least one of the front and rear sides for guiding the lifting cord to the outside of the head box; and a rotating drum arranged below the lifting drum and connected to a ladder cord that aligns and supports the shielding material, which is a slat of a horizontal blind, and which can tilt the ladder cord by rotating, the cord guide being a rotating drum support that rotatably supports the rotating drum and having a base portion on its underside in which a ladder cord insertion portion for guiding the ladder cord to the outside of the head box is formed. [Effects of the Invention]

[0018] The shielding device of the present invention is configured so that the lifting cord swings outward relative to the shielding material, thereby reducing the frictional resistance between the shielding material and the lifting cord. Furthermore, there is an effect of reducing the frictional resistance between the shielding material and the lifting cord without changing specifications such as increasing the size of the head box. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a front view showing the overall configuration of a shading device according to an embodiment of the present invention, in which the bottom rail is lowered to the bottom end and multiple slats are horizontal. FIG. [Figure 2] 2A and 2B are perspective views showing the configuration of a drum device provided in the shielding device according to the embodiment, where FIG. 2A is a diagram showing the drum device as viewed from above, and FIG. 2B is a diagram showing the drum device as viewed from below. [Figure 3] 3A and 3B are perspective views showing the configuration of a rotating drum receiver that constitutes a drum device provided in the shielding device according to the embodiment, where FIG. 3A is a diagram showing the rotating drum receiver as viewed from above, and FIG. 3B is a diagram showing the rotating drum receiver as viewed from below. [Figure 4] 2 is a cross-sectional view showing the internal configuration of a drum device provided in the shielding device according to the embodiment, taken along the line AA in FIG. 1. FIG. [Figure 5]2 is a cross-sectional view showing the internal configuration of a drum device provided in the shielding device according to the embodiment, and corresponds to a view of the central drum device taken along the line AA in FIG. 1. FIG. [Figure 6] 2 is a cross-sectional view showing the internal configuration of a drum device according to a first modified example, and corresponds to a view taken along the arrow AA in FIG. 1. FIG. [Figure 7] 1. FIG. 5 is a cross-sectional view showing the internal configuration of a drum device according to a second modified example, and corresponds to the view taken along the arrow AA in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] [Configuration of the cloaking device] First, the overall configuration of a shielding device according to an embodiment of the present invention will be described.

[0022] (Overall composition) 1 to 3, a shading device (hereinafter referred to as horizontal blind) Bd according to one embodiment of the present invention includes a C-channel head box Bh and a plurality of slats St serving as shading materials. The head box Bh can be attached to the top of a window frame or the ceiling surface via a plurality of brackets Br. The head box Bh also supports and suspends the plurality of slats St via a plurality of ladder cords Ce.

[0023] Referring to Fig. 1, the head box Bh accommodates an operation unit Uc, a first drive shaft 91s, and a second drive shaft 92s. The head box Bh also accommodates multiple drum devices 10. The drum devices 10 are comprised of a lifting drum receiver 11 and a rotating drum receiver 21 (see Fig. 2). The head box Bh also accommodates a brake Bk and a stopper Sp. An opening is formed in the bottom surface of the head box Bh at the position where the rotating drum receiver 21 is located.

[0024] Referring to Figure 1, the horizontal blind Bd further includes an operating unit 8a. The operating unit 8a includes a hollow operating rod 8Bt and an operating cord (not shown). By rotating the operating rod 8Bt around its axis, the angle of the multiple slats St can be adjusted via a rotation mechanism disposed inside the operating unit Uc. By operating the operating cord, the multiple slats St can be raised and lowered.

[0025] (Internal structure of the head box) Referring to Figure 1, the operation unit Uc includes a cord reel and a clutch mechanism. The cord reel has an operating cord wound around its outer periphery. The clutch mechanism can transmit or interrupt rotation of the cord reel depending on the operating mode of the operating cord.

[0026] 1 or 4, the first drive shaft 91s is made of a polygonal rod and is arranged along the longitudinal direction of the head box Bh. One end of the first drive shaft 91s is connected to a clutch mechanism (not shown) that rotates the first drive shaft 91s in only one direction. Rotation of the cord reel is transmitted to or blocked from the first drive shaft 91s via the clutch mechanism. The first drive shaft 91s passes through the center of the lifting drum 1d provided on the lifting drum support 11 (see FIG. 4). The first drive shaft 91s can transmit its rotation to multiple lifting drums 1d.

[0027] Referring to FIG. 1, one end of a lifting cord Cr is wound around the lifting drum 1d (see FIG. 4). The other end of the lifting cord cr is anchored to the bottom rail Rb. By rotating the first drive shaft 91s in one direction, the lifting drum 1d can take up the lifting cord Cr. Then, multiple slats St can be lifted via the bottom rail Rb.

[0028] 1, a stopper Sp disposed inside the head box Bh has a clutch spring and a cylindrical cam (neither of which are shown) disposed therein. When the first drive shaft 91s is rotated a predetermined amount in one direction and the stopper Sp is released, the first drive shaft 91s rotates in the other direction, the lifting cord Cr is unwound from the lifting drum 1d, and the bottom rail Rb is lowered. In this state, the weight of the slats St and the bottom rail Rb allows the slats St to be lowered.

[0029] Referring to FIG. 1, in the process of the first drive shaft 91s rotating in the other direction so that the plurality of slats St descends, the brake Bk can brake the rotational speed of the first drive shaft 91s.

[0030] Referring to FIG. 1, when the operating cord inserted through the operating rod 8Bt is pulled while the slats St are lowered, the first drive shaft 91s rotates in a direction in which the lifting drum 1d winds the lifting cord Cr. When the lowering of the operating cord is stopped, the weight of the slats St and bottom rail Rb causes the first drive shaft 91s to rotate slightly in a direction in which the lifting drum 1d unwinds the lifting cord Cr. This activates the stopper Sp, which stops the slats St at that height. During the process of lowering and raising the slats St, the stopper Sp does not activate and the first drive shaft 91s can continue to rotate.

[0031] Referring to FIG. 1, the second drive shaft 92s is made of a polygonal rod and is arranged along the longitudinal direction of the head box Bh. The second drive shaft 92s is also arranged substantially parallel to the first drive shaft 91s. One end of the second drive shaft 92s is rotatably supported by a case that forms the outer shell of the operation unit Uc, and is integrally rotatably connected to a gear (not shown) that transmits the driving force to the second drive shaft 92s when the operating rod 8Bt is rotated. This causes the second drive shaft 92s to rotate in response to the driving force.

[0032] 4 or 5, the other end of the second drive shaft 92s passes through the center of a rotating drum 2d provided in the drum device 10. The second drive shaft 92s can transmit its rotation to multiple rotating drums 2d.

[0033] 1 or 4 and 5, the rotating drum 2d anchors one end of a ladder cord Ce. The ladder cord Ce supports a slat St on each of multiple middle cords (not shown). The other end of the ladder cord Ce, which branches into two from the rotating drum 2d, is anchored to a ladder holder He (see FIG. 1). The ladder holder He supports a bottom rail Rb (see FIG. 1). When the second drive shaft 92s is rotated, the multiple slats St and the bottom rail Rb can be tilted simultaneously via the rotating drum 2d.

[0034] (Lifting cord configuration) The configuration of the slats St and the bottom rail Rb is as described above, but in this embodiment, the horizontal blind Bd has the lifting cords Cr at both ends positioned on the outdoor Ro side (see FIG. 4). The other ends of the lifting cords Cr at both ends are anchored to the bottom rail Rb (see FIG. 1). Referring to FIG. 4, the lifting cords Cr at both ends are guided by guide portions 22g (described later) and are wound or unwound onto the lifting drum 1d.

[0035] On the other hand, in the horizontal blind Bd according to the embodiment, the central lifting cord Cr is positioned on the room Ri side (see FIG. 5). The other end of the central lifting cord Cr is anchored to the bottom rail Rb (see FIG. 1). Referring to FIG. 5, the central lifting cord Cr is guided by a guide roller Rg provided on the rotary drum receiver 21, and is wound or unwound onto or from the lifting drum 1d (see FIG. 3(A) or FIG. 5).

[0036] 1, a plurality of lifting drums 1d are arranged along the longitudinal direction of the head box Bh. Referring to Fig. 5, of the plurality of lifting drums 1d, a lifting cord Cr hanging down from a first lifting drum 11d is led out of the head box Bh from the front side (the room Ri side) of a guide portion 21g of a rotary drum receiver 21 (first cord guide) arranged below the first lifting drum 11d.

[0037] Referring to Figure 4, among the multiple lifting drums 1d, the lifting cord Cr hanging down from the second lifting drum 12d is led out to the outside of the head box Bh from the rear side (outdoor Ro side) of the guide portion 22g of the rotating drum receiver 21 (second cord guide) arranged below the second lifting drum 12.

[0038] As described above, referring to FIG. 4 or 5, the horizontal blind Bd has the lifting cord Cr disposed at a position offset from the center of the slat in the front-to-rear direction.

[0039] (Configuration of the operation section) Next, the configuration of the operating unit 8a will be described. Referring to FIG. 1, the horizontal blind Bd has the operating unit 8a located at one end. An operating cord (not shown) is inserted into the operating rod 8Bt. The upper end of the operating cord is connected to a cord reel. The lower end of the operating cord is connected to the cord stopper 8c. The shaft of the cord reel is usually connected to the first drive shaft 91s via a clutch mechanism. The cord reel also has a power spring located inside it, which serves as a biasing means. When the cord stopper 8c is pulled downward relative to the operating rod 8Bt, the operating cord is unwound and the cord reel rotates in a direction that charges the spiral spring. This causes the first drive shaft 91s to rotate in one direction, rotating the lifting drum 1d (see Figure 4 or 5). This then raises the bottom rail Rb, allowing the horizontal blind Bd to open.

[0040] When the cord stopper 8c is released from a state in which it has been pulled downward relative to the operating rod 8Bt, the cord reel begins to rotate in the direction that winds up the operating cord due to the stored force of the power spring, and the clutch mechanism is disengaged. Then, the connection between the cord reel and the first drive shaft 91s is released, and the cord reel becomes free relative to the first drive shaft 91s and can rotate in the direction that winds up the operating cord due to the stored force of the power spring. This allows the cord stopper 8c to be pulled up toward the end of the operating rod 8Bt.

[0041] Furthermore, when the cord stopper 8c is pulled slightly to release it, the stopper Sp is released and the bottom rail Rb descends under its own weight, allowing the horizontal blind Bd to close. At this time, the descending speed of the first drive shaft 91s is controlled by the brake Bk.

[0042] 1, by gripping the grip 8g and rotating the operating rod 8Bt around its axis, the rotary drum 2d can be rotated via the second drive shaft 92s, and the multiple slats St can be tilted simultaneously. As described above, the operating part 8a can operate the horizontal blind Bd via the operating unit Uc.

[0043] (Drum device configuration) Next, the configuration of the drum device 10 according to the embodiment will be described. Referring to Figures 2 to 5, the drum device 10 includes a box-shaped lifting drum receiver 11 and a box-shaped rotating drum receiver 21 that serves as a cord guide. The lifting drum receiver 11 can be incorporated into the rotating drum receiver 21. The lifting drum receiver 11 and the rotating drum receiver 21 are formed by molding synthetic resin.

[0044] Referring to Fig. 2(A) or Figs. 4 and 5, a lifting drum 1d is rotatably supported on a lifting drum receiver 11. A lifting cord Cr is wound around the lifting drum 1d. The lifting drum receiver 11 is equipped with a cord holder 11c. The cord holder 11c covers part of the outer periphery of the lifting drum 1d from above. The cord holder 11c is detachably fitted into the lifting drum receiver 11. An opening is formed in the bottom surface of the lifting drum receiver 11.

[0045] 4 or 5, the lifting cord Cr hangs down from the lifting drum 1d and is led downward from the lifting drum receiver 11.

[0046] 3 to 5, a rotating drum 2d is rotatably supported on the rotating drum receiver 21. The rotating drum 2d is disposed below the lifting drum 1d. A guide roller Rg is rotatably supported on the rotating drum receiver 21. The guide roller Rg turns and guides the lifting cord Cr hanging down from the lifting drum 1d (see FIG. 5). Turning the lifting cord Cr by the guide roller Rg prevents interference between the lifting cord Cr and the rotating drum 2d. In this embodiment, the guide roller Rg is disposed on the front side of the head box Bh (the room Ri side) of the rotating drum receiver 21.

[0047] 4 or 5, the rotating drum 2d anchors one end of a ladder cord Ce. The ladder cord Ce is anchored to at least the uppermost slat St relative to the middle cord via a slat clip. The ladder cord Ce branches into two from the rotating drum 2d and supports the multiple slats St in an aligned manner. The other end of the ladder cord Ce branches into two and anchors to a ladder holder He (see FIG. 1). The ladder holder He fits into the bottom rail Rb, so that the other end of the ladder cord Ce supports the bottom rail Rb (see FIG. 1). When the second drive shaft 92s rotates, the multiple slats St and the bottom rail Rb can be tilted simultaneously via the rotating drum 2d.

[0048] (Configuration of rotating drum receiver) Next, the configuration of the rotating drum support 21 according to this embodiment will be described. Referring to Figures 3 to 5, the rotating drum support 21, which serves as a cord guide, has a pair of flange-shaped protrusions 21f and a pair of flat wall portions 21w. The pair of protrusions 21f protrude in opposite directions from the bottom of the rotating drum support 21. These protrusions 21f engage with the head box Bh, preventing the rotating drum support 21 from sliding downward.

[0049] 3 to 5, the pair of wall portions 21w is formed on a side surface adjacent to the side surface on which the protrusion 21f is formed. The pair of wall portions 21w stands upright on these side surfaces.

[0050] 3(B) or 4 and 5, the rotary drum receiver 21 has a platform-shaped base portion 21b protruding from the bottom surface. Furthermore, the base portion 21b is formed with guide portions 21g and 22g. The guide portions 21g and 22g can guide the lifting cord Cr by using slopes formed at their corners (see FIG. 4 or 5).

[0051] 4 or 5, the guide portion 21g is disposed on the front side (indoor Ri side) of the head box Bh (see FIG. 5), and the guide portion 22g is disposed on the rear side (outdoor Ro side) of the head box Bh (see FIG. 4).

[0052] 3 to 5, the rotating drum receiver 21 has a lifting / lowering cord insertion portion 211 and a lifting / lowering cord hanging portion 212. The lifting / lowering cord insertion portion 211 is formed in the wall portion 21w (see FIG. 3). The lifting / lowering cord insertion portion 211 is formed in the rotating drum receiver 21 from an upper to a lower position on the underside of the head box Bh. The lifting / lowering cord insertion portion 211 can lead the lifting / lowering cord Cr guided by the guide portion 21g or the guide portion 22g to the outside of the head box Bh (see FIG. 4 or 5).

[0053] Referring to Figure 4 or Figure 5, the lifting cord insertion portion 211 is a rectangular opening that leads the lifting cord Cr to at least one of the front side (indoor Ri side) and rear side (outdoor Ro side) of the rotating drum receiver 21.

[0054] 3 to 5, lift-up cord hanging portion 212 communicates with lift-up cord insertion portion 211. Lift-up cord Cr, which has been inserted through lift-up cord insertion portion 211, hangs downward from lift-up cord hanging portion 212 at a position below the bottom surface of head box Bh. Lift-up cord Cr is then guided to the outside of head box Bh from lift-up cord hanging portion 212.

[0055] 3 to 5, the rotating drum receiver 21 has a pair of ladder cord insertion portions 213. The pair of ladder cord insertion portions 213 is formed on the base portion 21b. The ladder cord insertion portion 213 is an opening through which the ladder cord Ce is inserted. The pair of ladder cord insertion portions 213 leads the ladder cord Ce to the outside of the head box Bh.

[0056] 3 to 5, in the drum device 10, the rotating drum receiver 21 is first inserted from above the head box Bh and fixed to the bottom surface of the head box Bh. In this case, a pair of claws 21n-21n is formed on one wall portion 21w (see FIG. 3(A)), and the other wall portion 21w is flat without the claws 21n (see FIG. 3(B)). By deforming the pair of claws 21n-21n from a tilted state of the rotating drum receiver 21 and then returning it to its original position, the rotating drum receiver 21 can be locked to the head box Bh (see FIG. 4 or 5).

[0057] Next, after attaching the ladder cord Ce to the rotating drum 2d of the rotating drum support 21, the drum device 10 can be attached to the head box Bh by inserting the lifting drum support 11 from above the rotating drum support 21 attached to the head box Bh so that the opening position of the lifting drum support 11 aligns with the position of the rotating drum support 21.

[0058] [Configuration of the cloaking device] Next, the operation and effect of the horizontal blind Bd according to the embodiment will be described.

[0059] 4 or 5, the rotary drum receiver 21 has a lifting cord insertion portion 211 on at least one of the front side (indoor Ri side) and rear side (outdoor Ro side) for leading the lifting cord Cr out of the head box Bh. This allows the horizontal blind Bd to be configured so that the lifting cord Cr swings outward relative to the slat St, reducing frictional resistance between the slat St and the lifting cord Cr. This also has the effect of reducing frictional resistance between the slat St and the lifting cord Cr without requiring any specification changes, such as increasing the size of the head box Bh.

[0060] Also, referring to Figures 3 to 5, the lifting cord insertion portion 211 is formed in a wall portion 21w that stands on at least one of the front and rear sides of the rotating drum receiver 21, so that the lifting cord Cr can be hung down without misalignment.

[0061] 3 to 5, the base portion 21b of the rotating drum receiver 21 protrudes from the underside of the head box Bh. The rotating drum receiver 21 forms a lifting cord insertion portion 211 extending from above to below the underside of the head box Bh, and also forms a lifting cord hanging portion 212 below the underside of the head box Bh.

[0062] Referring to Figures 3 to 5, the horizontal blind Bd has a structure in which a portion of the rotating drum support 21 protrudes from the underside of the head box, so that the lifting cord Cr can be led out of the head box Bh through the lifting cord insertion portion 211 so that it can swing more outward.

[0063] Furthermore, referring to Figure 3(B) or Figures 4 and 5, a ladder cord insertion portion 213 is formed in the rotating drum support 21 that rotatably supports the rotating drum 2d, so that the ladder cord Ce can be led out of the head box Bh without increasing the number of parts.

[0064] 3 to 5, the base portion 21b is formed so as to protrude from the lower surface of the head box Bh and so that its front-to-rear end constitutes a part of the lift-to-low cord insertion portion 211. The lift-to-low cord Cr is led out of the head box Bh from the front-to-rear end of the base portion 21b through the lift-to-low cord insertion portion 211.

[0065] In the horizontal blind Bd, the base portion 21b of the rotating drum receiver 21 protrudes downward from the underside of the head box Bh, allowing the lifting cord Cr to be guided down and swing back and forth. Also, because only the base portion 21b of the rotating drum receiver 21 protrudes from the underside of the head box Bh, frictional resistance between the slat St and the lifting cord Cr can be reduced without compromising the design compared to when the entire underside of the rotating drum receiver 21 protrudes.

[0066] Also, referring to Figures 4 and 5, the width of the rotating drum support 21 in the front-to-back direction is made smaller than the width of the slat, so that the horizontal blind Bd can be made compact while reducing the frictional resistance generated between the slat St and the lifting cord Cr.

[0067] 1, the first lifting drum 11d, which is located in the center of the head box Bh, has its lifting cord Cr on the outdoor Ro side (see FIG. 4). On the other hand, the second lifting drums 12d, which are located at both ends of the head box Bh, have their lifting cords Cr on the indoor Ri side (see FIG. 5).

[0068] The horizontal blind Bd according to the embodiment can reduce the frictional resistance between the slats St and the lifting cords Cr even when multiple lifting cords Cr are arranged offset in front of and behind the slats St. This is particularly advantageous for horizontal blinds that have slats as shielding materials, as it can reduce the frictional resistance between the slats St and the lifting cords Cr even when the slats St are raised and lowered while maintaining the horizontal position.

[0069] [First Modification] Next, the configuration of the drum device 20 according to the first modified example will be described. Referring to Fig. 6, the drum device 20 includes a box-shaped lifting drum receiver 11 and a box-shaped rotating drum receiver 31 that serves as a cord guide. The lifting drum receiver 11 can be incorporated into the rotating drum receiver 31.

[0070] 6, a lifting drum 1d is rotatably supported on a lifting drum receiver 11. A lifting cord Cr is wound around the lifting drum receiver 11. The lifting cord Cr hangs down from the lifting drum 1d. The lifting cord Cr also extends downward from the lifting drum receiver 11.

[0071] Referring to Figure 6, the rotating drum 2d is rotatably supported on the rotating drum support 31. The rotating drum 2d is disposed below the lifting drum 1d. One end of a ladder cord Ce is anchored to the rotating drum 2d. The ladder cord Ce anchors at least the uppermost slat St relative to the middle cord via a slat clip. The ladder cord Ce branches into two from the rotating drum 2d and supports the multiple slats St in alignment. When the second drive shaft 92s is rotated, the multiple slats St and the bottom rail Rb can be tilted simultaneously via the rotating drum 2d (see Figure 1).

[0072] 6, the rotary drum receiver 31, which serves as a cord guide, is formed with at least a pair of flanges 31f, which protrude in opposite directions from the bottom of the rotary drum receiver 31. These flanges 31f can abut against the bottom surface of the headbox Bh.

[0073] 6, the rotary drum receiver 31 has guide portions 31g and 32g formed inside the bottom. The guide portions 31g and 32g have slopes formed at their corners that can guide the lifting cord Cr.

[0074] 6, the rotating drum receiver 31 has a lifting / lowering cord insertion portion 311 and a lifting / lowering cord hanging portion 31h. The lifting / lowering cord insertion portion 311 is formed in the wall portion of the side surface. The lifting / lowering cord insertion portion 311 is formed in the rotating drum receiver 31 from an upper to a lower position on the underside of the head box Bh. The lifting / lowering cord insertion portion 311 can lead the lifting / lowering cord Cr, guided by the guide portion 31g or the guide portion 32g, to the outside of the head box Bh.

[0075] Referring to Figure 6, the lifting cord insertion portion 311 is a rectangular opening that leads the lifting cord Cr to at least one of the front side (indoor Ri side) and rear side (outdoor Ro side) of the rotating drum receiver 31.

[0076] 6, lift-up cord hanging portion 31h communicates with lift-up cord insertion portion 311. Lift-up cord Cr, which is inserted through lift-up cord insertion portion 311, hangs downward from lift-up cord hanging portion 31h at a position below the bottom surface of head box Bh. Lift-up cord hanging portion 31h leads lift-up cord Cr to the outside of head box Bh. Lift-up cord hanging portion 31h also serves as a hole through which lift-up cord Cr is led out.

[0077] 6, the rotating drum receiver 31 has a pair of ladder cord insertion portions 313 at its bottom. The ladder cord insertion portions 313 are openings through which the ladder cord Ce is inserted. The pair of ladder cord insertion portions 313 lead the ladder cord Ce to the outside of the head box Bh.

[0078] 6, in the drum device 20 according to the first modification, the rotary drum receiver 31 is inserted from below the head box Bh, whereas in the drum device 10 according to the embodiment, the rotary drum receiver 21 is inserted from above the head box Bh (see FIGS. 3 to 5). By inserting the rotary drum receiver 31 from below the head box Bh, it can engage with the lifting drum receiver 11, and the drum device 20 can be fixed to the head box Bh.

[0079] Also, referring to Figure 6, the drum device 20 according to the first modified example is different in that, while the outside of the lifting / lowering cord hanging portion 212 according to the embodiment is open (see Figure 4 or Figure 5), the lifting / lowering cord hanging portion 31h is a hole portion isolated by an outer wall.

[0080] [Second Modification] Next, the configuration of the drum device 30 according to the second modification will be described. Referring to Fig. 7, the drum device 30 includes a box-shaped lifting drum receiver 11 and a rotating drum receiver 41 that serves as a cord guide. The lifting drum receiver 11 can be incorporated into the rotating drum receiver 41. The configuration of the lifting drum receiver 11 is the same as that of the drum device 10 according to the embodiment, so a description thereof will be omitted.

[0081] Referring to Figure 7, the rotating drum 2d is rotatably supported on the rotating drum support 41. One end of a ladder cord Ce is anchored to the rotating drum 2d. The ladder cord Ce anchors at least the uppermost slat St relative to the middle cord via a slat clip. The ladder cord Ce branches into two from the rotating drum 2d and supports the multiple slats St in alignment. When the second drive shaft 92s is rotated, the multiple slats St and the bottom rail Rb can be tilted simultaneously via the rotating drum 2d.

[0082] As in the embodiment, the rotary drum receiver 41, which serves as a cord guide, has a pair of flange-shaped protrusions that protrude in opposite directions from the bottom of the rotary drum receiver 41. These protrusions engage with the head box Bh, preventing the rotary drum receiver 41 from sliding downward.

[0083] 7, the rotary drum receiver 41 has a platform-shaped base portion protruding from the bottom surface. Furthermore, the base portion is formed with guide portions 41g and 42g. The guide portions 41g and 42g have slopes formed at their corners that can guide the lifting cord Cr (see FIG. 4 or 5).

[0084] 7, the guide portion 41g is disposed on the front side (indoor Ri side) of the head box Bh, and the guide portion 42g is disposed on the rear side (outdoor Ro side) of the head box Bh.

[0085] 7, the rotating drum receiver 41 has a lifting / lowering cord insertion portion 411 and a lifting / lowering cord hanging portion 412. The lifting / lowering cord insertion portion 411 is formed on the rotating drum receiver 41 from an upper to a lower position on the underside of the head box Bh. The lifting / lowering cord insertion portion 411 can lead the lifting / lowering cord Cr, guided by the guide portion 41g or the guide portion 42g, to the outside of the head box Bh.

[0086] 7, the rotating drum receiver 41 has a pair of ladder cord insertion portions 413 at its bottom. The ladder cord insertion portions 413 are openings through which the ladder cord Ce is inserted. The pair of ladder cord insertion portions 413 lead the ladder cord Ce to the outside of the head box Bh.

[0087] Referring to FIG. 7, the drum device 30 according to the second modification differs from the drum device 10 according to the embodiment in that the pair of flat walls 21w-21w are formed (see FIGS. 3 to 5). In other words, the drum device 30 according to the second modification defines the lifting cord insertion portion 411 by not forming walls on the front and rear surfaces of the rotary drum support 31. It is not necessary to open both the front and rear surfaces of the rotary drum support 31; only one of the surfaces may be open. For example, if the lifting cord Cr is to be led out from the front side (indoor Ri side) of the head box Bh, the front surface of the rotary drum support 31 may be open and a wall may be formed on the rear surface. Furthermore, if the lifting cord Cr is to be led out from the rear side (outdoor Ro side) of the head box Bh, the rear surface of the rotary drum support 31 may be open and a wall may be formed on the front surface. This configuration maintains the strength of the rotary drum support 31.

[0088] Referring to FIG. 7, the lifting cord insertion portion 411 is an opening that leads the lifting cord Cr to at least one of the front and rear sides of the rotating drum receiver 41, thereby simplifying the structure of the rotating drum receiver 31.

[0089] The shading device of the present invention is not limited to horizontal blinds, but can be applied to shading devices that use a lifting cord, such as pleated screens, honeycomb screens, Roman shades, and roll-up shades. [Explanation of symbols]

[0090] 1d Lifting drum 2d rotating drum 11 Lifting drum support 21 Rotating drum holder (cord guide) 211 Lifting cord insertion part 212 Lifting cord hanging part Bd Horizontal blinds (shading devices) Bh headbox Ce ladder code Cr lift cord St. Slats (shielding material)

Claims

1. A shielding device in which a lifting cord capable of lifting and lowering a shielding material suspended from a head box is disposed at a position offset from the center of the shielding material in the front-to-rear direction, a lifting drum rotatably accommodated inside the head box and connected to the lifting cord so as to be capable of winding and unwinding the lifting cord; a cord guide disposed below the lifting drum and having a lifting cord insertion portion on at least one of a front side and a rear side for leading the lifting cord to the outside of the head box, The lifting drum is rotatably supported by a lifting drum receiver, The shielding device is capable of attaching the lifting drum receiver and the cord guide to the head box by assembling them together.

2. 2. The shading device according to claim 1, wherein the lifting cord insertion portion is formed in a wall portion standing on at least one of the front and rear sides of the cord guide.

3. The shading device according to claim 1 , wherein the lift-up cord insertion portion is an opening through which the lift-up cord is led out to at least one of the front side and the rear side of the cord guide.

4. At least a portion of the cord guide protrudes from the lower surface of the headbox, The lifting cord insertion portion is formed in the cord guide from an upper position to a lower position on the lower surface of the head box, 4. A shielding device according to claim 1, further comprising a lifting cord hanging portion for hanging the lifting cord, which has been passed through the lifting cord insertion portion, downward at a position below the lower surface of the head box.

5. The device further includes a rotating drum below the lifting drum, the rotating drum being connected to ladder cords that align and support the shielding material, which is a slat of a horizontal blind, and that can tilt the ladder cords by rotating the rotating drum; 5. A shielding device as described in any one of claims 1 to 4, wherein the cord guide is a rotating drum support having a base portion on its underside that rotatably supports the rotating drum and has a ladder cord insertion portion formed thereon for leading the ladder cord to the outside of the head box.

6. the base portion is formed so as to protrude from the lower surface of the head box and so as to have its front and rear ends form part of the lift cord insertion portion, The shielding device according to claim 5, wherein the lifting cord is led out from the front and rear ends of the base portion to the outside of the head box through the lifting cord insertion portion.

7. 7. The shielding device according to claim 1, wherein the cord guide has a width in the front-rear direction smaller than a width of the shielding material.

8. A plurality of the lifting drums and the cord guides are arranged along the longitudinal direction of the head box, a lifting cord suspended from a first lifting drum among the plurality of lifting drums is led out of the head box from a front side of a first cord guide disposed below the first lifting drum; 8. A shielding device according to claim 1, wherein a second lifting cord hanging from a second lifting drum among the plurality of lifting drums is led out of the head box from the rear side of a second cord guide arranged below the second lifting drum.

9. A shielding device in which a lifting cord capable of raising and lowering a shielding material suspended from a head box is disposed at a position offset from the center of the shielding material in the front-to-rear direction, a lifting drum rotatably accommodated inside the head box and connected to the lifting cord so as to be capable of winding and unwinding the lifting cord; a cord guide disposed below the lifting drum and having a lifting cord insertion portion on at least one of a front side and a rear side for leading the lifting cord to the outside of the head box; a rotating drum that is disposed below the lifting drum, connects ladder cords that align and support the shielding material, which is a slat of a horizontal blind, and can tilt the ladder cords by rotating; The cord guide is a rotating drum support that rotatably supports the rotating drum and has a base portion on its underside on which a ladder cord insertion portion is formed that leads the ladder cord to the outside of the head box.

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