Roller blind device

Abstract

To suppress an increase in length of a winding shaft even when a pulley is provided at an end of the winding shaft on a side where a screen winding mechanism is provided.SOLUTION: A roll blind device 1 includes a winding shaft 10 rotatably supported within a winding box 7; a screen 20 connected to the winding shaft with engaging members 23 on both ends; a screen winding mechanism 30 equipped with a spring shaft 32 and a coil spring 33; and a manual winding mechanism 45 that rotates the winding shaft via a pulley 46. The winding shaft includes a winding main body 11 and a first winding cap 12 that wind up the screen and the engaging members. Both ends of the coil spring are fixed to the winding main body and the spring shaft. A first bearing member 8 supporting the winding shaft includes a large-diameter portion 8a and a small-diameter shaft portion 8b, and a tip end of the spring shaft is fixed in an insertion recess 8c of the small-diameter shaft portion, securing the pulley to the first winding cap. With a first side surface in contact with the large-diameter portion, the pulley is rotatably supported on the small-diameter shaft portion, and a second side surface prevents upward displacement of the engaging members.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a roller blind device that includes a screen winding mechanism that automatically winds a screen onto a winding shaft, and a manual winding mechanism that manually winds the screen onto the winding shaft. [Background technology]

[0002] A roll screen device equipped with a screen winding mechanism that automatically winds a screen onto a winding shaft and a manual winding mechanism that manually winds the screen onto the winding shaft has been known. As described in Patent Document 1, this conventional roll screen device has a winding shaft rotatably supported within a hollow winding box, and a screen winding mechanism with a coil spring is provided at one longitudinal end of the winding shaft. This screen winding mechanism is configured so that, as the screen is unwound from the winding shaft, the coil spring accumulates spring force in the winding direction, and this spring force automatically winds up the screen. Meanwhile, the manual winding mechanism has an operating cord wound around a pulley attached to the other longitudinal end of the winding shaft. Operating the operating cord in forward and reverse directions rotates the winding shaft via the pulley, thereby unwinding or winding the screen.

[0003] In conventional roller blind devices equipped with such a screen winding mechanism and manual winding mechanism, a pulley for the manual winding mechanism is provided on the end of the winding shaft opposite the side where the screen winding mechanism is located, but if this pulley is provided on the end on the screen winding mechanism side, there is a risk that the longitudinal length of the winding shaft will increase due to its relationship with the components of the winding mechanism and the components that support the winding shaft, etc. Therefore, even if a pulley is provided on the end of the winding shaft on the side where the screen winding mechanism is located, it is desirable to be able to minimize the increase in the length of the winding shaft. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-203267 Summary of the Invention [Problem to be solved by the invention]

[0005] The technical object of the present invention is to provide a roll screen device that is configured to allow the screen to be rolled up automatically or manually, and that can minimize the increase in the length of the winding shaft even if a pulley is provided at the end of the winding shaft on which the screen winding mechanism is arranged. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the roller blind device according to the present invention comprises a winding box having one end and the other end at both ends in the axial direction and having a hollow interior, a winding shaft supported in the winding box so as to be rotatable about the axis, a screen having a base end connected to the winding shaft and a tip end extending from the winding box and having engaging elements at both end portions, a pair of side rods provided at both ends of the winding box and having engaging grooves for guiding the engaging elements as the screen is opened or closed, and a spring force that accumulates in the winding direction as the screen is unwound from the winding shaft. and a manual winding mechanism which rotates the winding shaft via the rotation transmission body which is rotated by the operation cord and is provided coaxially with the axis of the winding shaft at the end of the one end side of the winding shaft, and which rotates the winding shaft via the rotation transmission body which is rotated by the operation cord, wherein the winding shaft has a cylindrical winding main body part which winds up the screen, and a first winding cap which projects from the end of the one end side of the winding main body part and winds up the engaging element, and the end of the one end side of the winding shaft is provided on the inner surface of the one end side of the winding box. The screen winding mechanism includes a coil spring housed within the winding main body and accumulating the spring force, and a spring shaft disposed on the axis within the winding main body and fixing one end of the coil spring, and the other end of the coil spring is fixedly connected to the winding main body around the axis. The bearing member includes a large diameter portion attached to the inner surface and a small diameter shaft portion that protrudes from the winding shaft side of the large diameter portion and has a diameter smaller than that of the large diameter portion, and an end surface of the small diameter shaft portion facing the winding shaft side is an insertion recess is formed in the winding box, and at one end side of the winding box, an end of the spring shaft passes through the winding main body portion and into the first winding cap to rotatably support the first winding cap, and further, a tip end thereof is fixedly inserted into the insertion recess of the small diameter shaft portion around the axis, and the rotation transmission body is fixed to an end portion on the one end side of the first winding cap, and the rotation transmission body has a first side surface on the one end side and a second side surface on the other end side, and with the first side surface slidably contacting an end face of the large diameter portion on which the small diameter shaft portion is provided,The engaging element is supported rotatably around the small diameter shaft portion, and the second side surface prevents the engaging element from shifting outward in the axial direction.

[0007] In this case, preferably, the first winding cap has a cylindrical engaging element winding portion arranged coaxially with the axis line and winding up the engaging element, and the diameter of the engaging element winding portion is larger than the diameter of the small diameter shaft portion.

[0008] Preferably, the rotation transmitting body and the first winding cap are integrally molded.

[0009] Also, preferably, the winding shaft has a second winding cap that protrudes from the end portion on the other end side of the winding main body and winds up the engaging element, and the second winding cap has a flange portion that is annularly formed around the axis to prevent the engaging element from shifting outward in the axial direction. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a vertical sectional front view of a main part of a roller blind device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional plan view of the roller blind device. [Figure 3] FIG. 2 is an enlarged longitudinal sectional front view of a main part of the roller blind device. [Figure 4] FIG. 2 is a front view of the roller blind device. [Figure 5] FIG. 10 is a perspective view of a main part on the front side according to another modified example of the roller blind device. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 to 4 show one embodiment of a roller blind device according to the present invention. In this embodiment, as shown in Fig. 1, a roller blind device 1 of a horizontal opening type that opens and closes by moving the screen 20 horizontally will be described. Note that the roller blind device 1 is not limited to a horizontal opening type, and may also be a vertical opening type that opens and closes by raising and lowering the screen 20 up and down.

[0012] As shown in Figures 1 to 4, the roller blind device 1 comprises a hollow winding box 7, a winding shaft 10 supported inside the winding box 7 so as to be rotatable about an axis L extending in the vertical direction, a screen 20 whose base end is connected to the winding shaft 10 and whose tip end extends out from the winding box 7, and which has engaging elements 23 on both end portions, a pair of horizontal frames (side rods) 4a, 4b provided at both end portions of the winding box 7 in the direction of the axis L and having engaging grooves 24, 25 that guide the engaging elements 23 as the screen 20 is opened and closed, a screen winding mechanism 30 that accumulates a spring force in the winding direction as the screen 20 is unwound from the winding shaft 10, and a manual winding mechanism 45 that is provided at the upper end of the winding shaft 10 and has a disk-shaped pulley 46 (rotation transmission body) around which an operating cord 47 is wound, and which rotates the winding shaft 10 via the pulley 46 that rotates by the operating cord 47.

[0013] For ease of explanation, the longitudinal direction of the winding box 7 may be referred to as the "up-down direction," the direction of the horizontal frames 4a, 4b as the "left-right direction," and the depth direction of the roller blind device 1 as the "front-rear direction."

[0014] As shown in Figures 1 to 3, the roller blind device 1 further includes a screen frame 2 having a pair of vertical frames 3a, 3b and a pair of horizontal frames 4a, 4b (side bars). In this embodiment, of the pair of vertical frames 3a, 3b, the vertical frame 3a arranged on the right side is configured as a winding box 7 having a winding shaft 10 therein for winding up the screen 20. The vertical frame 3b arranged on the left side is configured as a receiving frame against which a movable crosspiece 27 attached to the tip of the screen 20 abuts when the screen 20 is in an open state.

[0015] In addition, the pair of horizontal frames 4a, 4b have their right ends connected to the upper and lower ends of the inner side wall 7a of the winding box 7, and their left ends connected to the upper and lower ends of the inner side wall 3b1 of the vertical frame 3b.

[0016] The winding box 7 has a first end 7e (one end) and a second end 7f (the other end) at both ends in the vertical direction, and is formed into a hollow rectangular tube shape. An outlet 7b extending in the vertical direction and for discharging the screen 20 is opened at the rear of the side wall 7a facing the left side of the winding box 7. The outlet 7b extends between the upper and lower parts of the side wall 7a and is formed into a rectangular shape in a side view. A winding shaft 10 is provided inside the winding box 7 and is supported so as to be rotatable about an axis L extending in the vertical direction.

[0017] The winding shaft 10 has a cylindrical winding body 11 extending vertically, a first winding cap 12 attached to the upper end of the winding body 11, and a second winding cap 13 attached to the lower end of the winding body 11. The first winding cap 12 has a cylindrical mounting portion 12b attached to the winding body 11, a cylindrical engaging element winding portion 12c that protrudes from the first end 7e of the mounting portion 12b and winds up the engaging element 23, and a pulley 46 provided at the end of the engaging element winding portion 12c on the first end 7e side. The diameter of the engaging element winding portion 12c is smaller than the diameter of the mounting portion 12b.

[0018] The upper end of the first winding cap 12 is rotatably supported by a first bearing member 8 provided on the inner surface 7g of the upper end of the winding box 7. In this embodiment, the upper end of the first winding cap 12 is rotatably supported by the first bearing member 8 via a pulley 46. Meanwhile, the lower end of the second winding cap 13 is rotatably supported by a second bearing member 9 provided on the bottom surface 7h of the winding box 7.

[0019] The first bearing member 8 has a large-diameter portion 8a attached to the inner surface 7g of the upper end of the winding box 7, and a small-diameter shaft portion 8b that protrudes from the lower portion of the large-diameter portion 8a and has a smaller diameter than the large-diameter portion 8a. An insertion recess 8c is formed in the downward end face of the small-diameter shaft portion 8b. A pulley 46 of a manual winding mechanism 45 (described later) is supported on the small-diameter shaft portion 8b so as to be rotatable about an axis L. The diameter of the small-diameter shaft portion 8b is smaller than the diameter of the engaging element winding portion 12c of the first winding cap 12.

[0020] The second bearing member 9 is configured in the same manner as the first bearing member 8, and has a large diameter portion 9a attached to the bottom surface 7h of the winding box 7, and a small diameter shaft portion 9b protruding from the upper part of the large diameter portion 9a and having a smaller diameter than the large diameter portion 9a.

[0021] The second winding cap 13 has a hole 13a that penetrates in the vertical direction. The hole 13a has a large-diameter hole 13a1 at its lower portion, the diameter of which is enlarged. The small-diameter shaft 9b of the second bearing member 9 is fitted into this large-diameter hole 13a1, and the second winding cap 13 is rotatably supported around this small-diameter shaft 9b.

[0022] The second winding cap 13 has a flange 13b at its lower end that protrudes radially outward and is formed in an annular shape around the axis L. This flange 13b is in slidable contact with an end surface 9c of the large diameter portion 9a that faces the small diameter shaft portion 9b side. Therefore, the flange 13b can prevent the engaging element 23 from shifting downward and can also prevent the winding shaft 10 from moving downward.

[0023] A screen winding mechanism 30 is provided inside the winding shaft 10 to rotate the winding shaft 10 in a direction to wind up the screen 20. The screen winding mechanism 30 has a spring shaft 32 arranged coaxially with the winding shaft 10 inside the winding main body 11, and a coil spring 33 attached around the axis L of the spring shaft 32. The upper end of the spring shaft 32 is inserted from the winding main body 11 into a hole 12a in the first winding cap 12, and further, the tip end is fixedly inserted around the axis L into an insertion recess 8c that communicates with the hole 12a. In this embodiment, the lower end of the spring shaft 32 is located at the bottom inside the winding main body 11.

[0024] The upper end of the coil spring 33 is fixed to the upper part of the spring shaft 32, and the lower end of the coil spring 33 is fixedly connected to the inner surface of the winding main body 11 around the axis L via a cylindrical spring bearing 34. Therefore, when the screen 20 is unwound from the winding shaft 10 and the winding shaft 10 rotates, the coil spring 33 is twisted and accumulates a biasing force. This accumulated biasing force then rotates the winding shaft 10 in the direction in which the screen 20 is wound up, and the screen 20 is stored in the winding box 7.

[0025] The movable crosspiece 27 is disposed between the pair of horizontal frames 4a, 4b and extends in the vertical direction. Rollers 28, 28 that are rotatably supported around rotation axes extending in the front-to-rear direction are disposed at both the upper and lower ends of the movable crosspiece 27. These rollers 28, 28 roll relative to the horizontal frames 4a, 4b, facilitating left-right movement of the movable crosspiece 27 when opening or closing the screen 20.

[0026] 1 to 3, the screen 20 is formed in a rectangular shape in a front view when it is led out from the outlet 7b of the winding box 7, with its right end connected to the winding shaft 10 and its left side led out from the outlet 7b. In this embodiment, the screen 20 is formed from a flexible sheet-like material such as an insect screen for a screen door.

[0027] Engagement members 21 are provided on both upper and lower end portions of the screen 20. The engagement members 21 include mounting piece portions 22 provided continuously along the respective side edges of the upper and lower end portions of the screen 20, and a large number of engagement pieces 23 provided continuously along the side edges of the upper and lower end portions of the mounting piece portions 22. The engagement pieces 23 are engaged in engagement grooves 24, 25 extending from the horizontal frames 4a, 4b in a locked state, and move along the engagement grooves 24, 25 when the screen 20 is opened or closed.

[0028] The engagement grooves 24, 25 are arranged in parallel along the horizontal frames 4a, 4b, and are open at their end faces on the winding shaft 10 side. The engagement grooves 24, 25 have guide surfaces 24a, 25a extending along the horizontal frames 4a, 4b, and slits 24b, 25b formed in the guide surfaces 24a, 25a and opening toward the screen 20 side. The slits 24b, 25b extend in the left-right direction along the guide surfaces 24a, 25a, and engage with the engagement pieces 23, 23 in a non-detachable state. For this reason, the front-rear width of the slits 24b, 25b is greater than the thickness of the mounting piece portions 22, 22, but narrower than the width of the engagement pieces 23, 23.

[0029] An engaging member 21 is also provided at the tip of the screen 20, and an engaging piece 23 of this engaging member 21 is attached to the movable crosspiece 27 in a manner that prevents it from coming off (see FIG. 2). By moving the movable crosspiece 27 toward the left from the winding box 7, the screen 20 can be moved between an open state in which the entire screen 20 is led out through the lead-out opening 7b and the movable crosspiece 27 contacts the vertical frame 3b, and a closed state (see FIG. 3) in which the entire screen 20 is wound around the winding shaft 10 by the coil spring 33 of the screen winding mechanism 30 and stored in the winding box 7. When the screen 20 is in the closed state, the right end of the movable crosspiece 27 abuts against the inner side wall 7a of the winding box 7, and the closed state of the screen 20 is maintained.

[0030] Next, a manual winding mechanism 45 for manually winding up the screen 20 will be described. As shown in FIGS. 1, 3, and 4, the manual winding mechanism 45 includes a pulley 46 provided on the first winding cap 12 and an operating cord 47 wound around the pulley 46. The pulley 46 is formed in a disk shape, and a hole 46d extends through the center of the pulley 46. The small diameter shaft portion 8b of the first bearing member 8 is fitted into this hole 46d, and the pulley 46 is rotatably supported around this small diameter shaft portion 8b. In this embodiment, the pulley 46 and the first winding cap 12 are integrally molded, and therefore the first winding cap 12 is rotatably supported together with the pulley 46 around the small diameter shaft portion 8b.

[0031] The pulley 46 is rotatably supported around the small diameter shaft portion 8b with its upward-facing first side surface 46b in slidable contact with the end surface 8d of the large diameter portion 8a on which the small diameter shaft portion 8b is provided. This prevents the winding shaft 10 from moving upward in the direction of the axis L. Furthermore, because the diameter of the small diameter shaft portion 8b is smaller than that of the engaging element winding portion 12c, the second side surface 46c can be disposed opposite the engaging element 23. Therefore, the second side surface 46c prevents the engaging element 23 from shifting upward.

[0032] An annular outer circumferential groove 46a for winding the operating cord 47 is formed on the outer circumferential surface of the pulley 46, and a plurality of engaging pieces (not shown) for engaging with the ball members 48 of the operating cord 47 are arranged at equal intervals around the axis L in this outer circumferential groove 46a. Note that, although the pulley 46 is described as the rotation transmitting body in this embodiment, a sprocket may be used instead of the pulley 46. In this case, a sprocket that is compatible with a ball chain-like operating cord is used.

[0033] The operating cord 47 has a first end 47a and a second end 47b, and both ends are not connected to each other. In this embodiment, the operating cord 47 is a flexible cord configured by connecting a number of ball members 48 at regular intervals with connecting strips 49. The operating cord 47 is wound around a pulley 46 so that the first end 47a and the second end 47b are located on the front side of the roller shade device 1. A grip 50 is provided at the first end 47a of the operating cord 47, which is used to manually pull the operating cord 47. In this embodiment, a grip 50 is also provided at the second end 47b of the operating cord 47.

[0034] The first end 47a and the second end 47b of the operating cord 47 are led out from the winding box 7 to the outside through a first opening 7c and a second opening 7d opened at the upper end of the front side of the winding box 7. When the first end 47a of the operating cord 47 led out from the first opening 7c is pulled downward, the first end 47a of the operating cord 47 hangs the screen 20 with a length sufficient to store it in the winding box 7. At this time, the grip 50 provided on the second end 47b of the operating cord 47 moves in front of the second opening 7d. These grips 50 are larger than the first opening 7c and the second opening 7d. Therefore, even if the first end 47a and the second end 47b of the operating cord 47 attempt to move into the first opening 7c and the second opening 7d, these movements can be prevented.

[0035] As described above, in this embodiment, the pulley 46 is rotatably supported around the small-diameter shaft portion 8b with its first side surface 46b in slidable contact with the end surface 8d of the large-diameter portion 8a, and the second side surface 46c of the pulley 46 is positioned adjacent to the engaging element 23. Furthermore, the pulley 46 and the first winding cap 12 are integrally molded. Therefore, compared to a case in which the engaging element winding portion 12c of the first winding cap 12 is provided with a flange portion for preventing the engaging element 23 from shifting, and the pulley 46 is positioned closer to the take-up shaft 10 than in a case in which the pulley 46 is positioned further outward in the axial direction L than the flange portion, even if the pulley 46 is provided at the end of the take-up shaft 10, an increase in the length of the take-up shaft 10 in the axial direction L can be minimized.

[0036] In the above-described embodiment, the pulley 46 and the first winding cap 12 are integrally molded, but the present invention is not limited to this. The pulley 46 and the first winding cap 12 may be formed separately and then fixedly connected to each other.

[0037] FIG. 5 shows a modified example of the roller shade device 1. In the embodiment described above, the grips 50 are provided on both the first end 47a and the second end 47b of the operating cord 47, but this is not limiting. As shown in FIG. 5, the operating cord 47 may be one in which the grips are omitted from both the first end 47a and the second end 47b. In this case, the second end 47b of the operating cord 47 may be hung within the take-up box 7 without being led out through the second opening 7d. Furthermore, the operating cord 47 may be formed endlessly with the first end 47a and the second end 47b connected to each other. [Explanation of symbols]

[0038] 1 Roller screen device 4a, 4b Horizontal frame (side rod) 7 Winding box 7b Outlet 7e 1st end (one end) 7f 2nd end (other end) 8 First bearing member (bearing member) 8a Large diameter part 8b Small diameter shaft 8c Insertion recess 8d end face 10 Winding shaft 11 Winding main body 12 First winding cap 12c Engagement winding section 13 Second winding cap 13b Flange 20 screens 23 Engagement element 24, 25 Engagement groove 30 Screen winding mechanism 32 Spring shaft 33 Coil spring 45 Manual winding mechanism 46 Pulley (rotation transmission body) 46a Outer groove 46b 1st side 46c 2nd side 47 Operation Code L axis

Claims

1. a winding shaft supported in the winding box so as to be rotatable about the axis; a screen having a base end connected to the winding shaft and a tip end extending from the winding box, the screen having engaging elements at both end portions; a pair of side rods provided at both end portions of the winding box and having engaging grooves for guiding the engaging elements as the screen is opened or closed; a screen winding mechanism that accumulates a spring force in a winding direction as the screen is unwound from the winding shaft; and a manual winding mechanism that includes a disk-shaped rotation transmission body provided coaxially with the axis at an end portion of the one end of the winding shaft and around which an operating cord is wound, the manual winding mechanism rotating the winding shaft via the rotation transmission body that is rotated by the operating cord, the winding shaft has a cylindrical winding main body portion that winds up the screen, and a first winding cap that protrudes from an end portion on the one end side of the winding main body portion and winds up the engaging element, an end portion of the winding shaft on the one end side is rotatably supported by a bearing member provided on an inner surface of the winding box on the one end side, the screen winding mechanism includes a coil spring housed within the winding main body and accumulating the spring force; and a spring shaft arranged on the axis within the winding main body and fixing one end of the coil spring to the spring shaft, the other end of the coil spring being fixedly connected to the winding main body around the axis; the bearing member has a large diameter portion attached to the inner surface and a small diameter shaft portion that protrudes from the winding shaft side of the large diameter portion and has a smaller diameter than the large diameter portion, and an insertion recess is opened on an end surface of the small diameter shaft portion that faces the winding shaft side, At one end side of the winding box, an end portion of the spring shaft passes through the winding main body portion and the first winding cap to rotatably support the first winding cap, and further, a tip portion of the spring shaft is fixedly inserted into the insertion recess of the small diameter shaft portion around the axis, The rotation transmission body is fixed to an end portion on the one end side of the first winding cap, The rotation transmission body has a first side surface on the one end side thereof and a second side surface on the other end side thereof, and is rotatably supported around the small diameter shaft portion with the first side surface in slidable contact with the end surface of the large diameter portion on which the small diameter shaft portion is provided, and the second side surface prevents the engagement element from shifting outward in the axial direction. A roller blind device characterized by:

2. the first winding cap has a cylindrical engaging element winding portion that is arranged coaxially with the axis and winds up the engaging element, The diameter of the engagement winding portion is larger than the diameter of the small diameter shaft portion.

2. The roller blind device according to claim 1.

3. The rotation transmission body and the first winding cap are integrally molded.

2. The roller blind device according to claim 1.

4. the winding shaft has a second winding cap that projects from the other end of the winding body and winds up the engaging element; The second winding cap has a flange portion formed annularly around the axis to prevent the engaging element from shifting outward in the axial direction.

2. The roller blind device according to claim 1.

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