Suspension structure of the winding part of the opening / closing mechanism

Abstract

To provide a hinge-side structure of an opening / closing body roll-up section configured to reduce material cost, realize fire preventive structure, and facilitate assembling.SOLUTION: A hinge-side structure of an opening / closing body roll-up section connects an opening / closing body 15 which opens / closes an opening of a building and a roll-up shaft 17 which rolls up the opening / closing body 15, with a fastening member 19. The roll-up shaft 17 is a hollow pipe formed by joining both ends of a plate member 51 by roll forming, and the ends have a joining section 55 where they are folded back in different directions for engagement, and the overlapping portion is crushed flat. The joining section 55 is configured so that a fold-back length S serving as a margin for locking the ends is larger than an external diameter d (S>d) in a shaft part 57 of the fastening member 19 that penetrates through the joining section 55 in a plate thickness direction, and that a hinge-side edge 47 of the opening / closing body 15 is superposed on the joining section 55 to fasten and fix them with the fastening member 19 penetrating through the hinge-side edge 47.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a suspension structure of an opening / closing body winding portion.

Background Art

[0002] In an opening / closing body suspension structure for attaching an opening / closing body that opens and closes an opening of a building to the outer periphery of a winding shaft that winds up the opening / closing body via a suspension member, on the outer periphery of the winding shaft, hooking protrusions continuous along its axial direction are integrally formed and locked in a state where a hooking portion formed on the suspension member is hooked thereon, and a screw passing through the suspension member is screwed and fixed to an aluminum winding shaft. An opening / closing body suspension structure is known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventional winding shafts used in suspension structures are constructed from a single extruded pipe made of aluminum, which has good formability, and have sufficient thickness to provide rigidity, resulting in somewhat high manufacturing costs. Furthermore, when the structure of the opening and closing mechanism is fire-resistant, the aluminum winding shaft may soften and melt due to the heat of a fire. For these reasons, there is a demand for winding shafts made of steel. However, while aluminum winding shafts have a wall thickness of 2-3 mm, allowing the suspension member to be directly screwed to the winding shaft, if the winding shaft is made of steel, the wall thickness is only about 0.4 mm, making it difficult to secure the screw thread engagement and thus insufficient fixing strength. Moreover, if the plate thickness of a steel winding shaft is increased to secure the screw thread engagement, the weight increases unnecessarily, requiring a larger opening and closing mechanism. In other words, while this is feasible for shutter devices installed in large openings when the opening and closing mechanism is a shutter, it cannot be said to be feasible for small, lightweight shutter devices such as window shutters installed in residential windows. Furthermore, in the case of a thin winding shaft, it is conceivable to use nuts and screws (bolts) to ensure fixing strength, but this presents problems in terms of nut placement and screwing work, as the screws (bolts) passed through from the outside must be screwed into nuts located on the inside of the winding shaft, which are difficult to see.

[0005] This invention has been made in view of the above circumstances, and its purpose is to provide a suspension structure for an opening / closing body winding section that can reduce material costs, realize a fire-resistant structure, and facilitate assembly work. [Means for solving the problem]

[0006] Next, means for solving the above-mentioned problems will be described with reference to drawings corresponding to the embodiments. The suspension structure for the winding mechanism of an opening / closing body according to claim 1 of the present invention is a suspension structure for the winding mechanism of an opening / closing body that connects an opening / closing body 15 that opens and closes an opening 13 of a building and a winding shaft 17 that winds up the opening / closing body 15 with a fastening member 19, The winding shaft 17 is a hollow pipe formed by joining the edges of both ends of a plate material 51. The aforementioned edges have a joint 55 formed by folding each edge in opposite directions and overlapping them, and flattening the overlapping portion in the thickness direction of the plate. The aforementioned joint portion 55 has a folded length that serves as an overlap for each of the edges, and the folded length is greater than the outer diameter of the shaft portion 57 of the fastening member 19 that penetrates the joint portion 55 in the plate thickness direction. The hinge end 47 of the opening / closing body 15 is superimposed on the joint 55 and fastened and secured by the fastening member 19 that penetrates the hinge end 47.

[0007] In the suspension structure of this opening / closing winding section, the winding shaft 17 is formed into a hollow pipe by roll forming, that is, by bending a sheet metal and joining the edges at both ends. The hollow pipe has a joint 55 formed by folding the edges of the sheet metal 51 in opposite directions and overlapping them, and then flattening the overlapping portion in the thickness direction. The joint 55 is continuously thicker in the direction along the axis of the winding shaft 17. Therefore, the thickness of this joint 55 is equivalent to the thickness of four sheets of sheet metal 51 that form the outer circumference of the winding shaft 17. As a result, the joint 55 satisfies the sheet metal thickness required for fastening the fastening member 19, i.e., the screw-fitting dimension. For example, if the sheet metal 51 is 0.4 mm thick, the joint 55 will be 1.6 mm thick, and if the sheet metal 51 is 0.6 mm thick, the joint 55 will be 2.4 mm thick. Furthermore, the overlapping length of each edge of the joint 55 is set to be at least greater than the outer diameter of the shaft portion 57 of the fastening member 19. As a result, the shaft portion 57 penetrates the joint 55, which is made thicker by stacking four thin plates 51. The fastening member 19 may be a screw, bolt, rivet, etc. The opening / closing body 15 has its suspension edge 47 overlapping the joint 55, and the shaft portion 57 of the fastening member 19 penetrates both the suspension edge 47 and the joint 55, allowing it to be firmly fastened and fixed to the joint 55. In this suspension structure for the winding section of the opening / closing body, even if the winding shaft 17 is made of thin plate material 51, the overlapping of multiple plate materials 51 at the joint 55 allows for easy fastening of the suspension end 47 of the opening / closing body 15 with sufficient fixing strength. As a result, the suspension structure for the winding section of the opening / closing body can be made of inexpensive steel instead of expensive aluminum. By using steel for the winding shaft 17, fire resistance can be improved compared to aluminum. Furthermore, since the fastening member 19 can be fastened from the outer circumference of the winding shaft 17, there is no need to place a nut inside the winding shaft 17, eliminating the need for separate components and allowing for easy fastening of the winding shaft.

[0008] The suspension structure for the winding part of the opening / closing body according to claim 2 of the present invention is the suspension structure for the winding part of the opening / closing body according to claim 1, The plate material 51 is the outer circumferential surface 53 of the winding shaft 17, and the joint portion 55 is positioned outside the winding shaft 17 beyond the outer circumferential surface 53.

[0009] In this suspension structure for the winding mechanism of the opening / closing body, the opening / closing body 15 is wound onto the outer circumferential surface 53 of the winding shaft 17. The winding shaft 17 is formed by roll forming, as described above. Roll forming involves passing a strip-shaped sheet material 51 through several sets of forming rolls arranged in a row to continuously form a predetermined cross-section (polygon or round). The formed winding shaft 17 has both ends folded in opposite directions and overlapped, and the overlapping portion is flattened in the thickness direction to form a joint 55. This joint 55 is positioned to protrude outward from the winding shaft 17 beyond the sheet material 51 forming the outer circumferential surface 53 of the winding shaft 17. Therefore, the joint 55 does not have a recessed shape that is recessed inward from the outer circumferential surface 53 of the winding shaft 17. As a result, the suspension end 47 of the opening / closing body 15, which is fixed to the outer circumferential surface 53, can be fixed by the fastening member 19 in close contact with the joint 55. Therefore, the opening / closing body 15 does not experience deformation of the suspension edge 47 due to the suspension edge 47 being fastened to a joint 55 that is recessed compared to the outer surface. In other words, it is not necessary to forcibly deform the suspension edge 47 to fasten and fix it.

[0010] The suspension structure for the winding part of the opening / closing body according to claim 3 of the present invention is the suspension structure for the winding part of the opening / closing body according to claim 1, The fastening member 19 is characterized by having a male thread formed on the outer circumference of the shaft portion 57, and the hanging end 47 through which this male thread passes is screwed into the joint portion 55.

[0011] In this suspension structure for the winding part of the opening / closing body, the fastening member 19 is, for example, a bolt or screw having a male thread on the shaft portion 57. Furthermore, the screw may be a self-tapping screw. When the fastening member 19 is a bolt or screw, a female thread is formed in the thickness direction of the joint portion 55. The female thread is formed so as to penetrate the joint portion 55, which is formed by stacking and flattening four plate materials 51. The opening / closing body 15 is fastened to the joint portion 55 by the fastening member 19, which has penetrated the suspension end edge 47, screwing into this female thread from the outside of the winding shaft 17 and passing through the joint portion 55.

[0012] The suspension structure for the winding part of the opening / closing body according to claim 4 of the present invention is the suspension structure for the winding part of the opening / closing body according to claim 2, The fastening member 19 is characterized by having a male thread formed on the outer circumference of the shaft portion 57, and the hanging end 47 through which this male thread passes is screwed into the joint portion 55.

[0013] In this suspension structure for the winding part of the opening / closing body, the fastening member 19 is, for example, a bolt or screw having a male thread on the shaft portion 57. Furthermore, the screw may be a tapping screw. When the fastening member 19 is a bolt or screw, a female thread is formed in the thickness direction of the joint portion 55. The female thread is formed so as to penetrate the joint portion 55, which is formed by stacking and flattening four plate materials 51. The opening / closing body 15 is screwed to the joint portion 55 by the fastening member 19, which has penetrated the suspension end edge 47, screwing into this female thread from the outside of the winding shaft 17 and penetrating the joint portion 55 which protrudes beyond the outer surface of the winding shaft 17.

[0014] The suspension structure for the winding part of the opening / closing body according to claim 5 of the present invention is the suspension structure for the winding part of the opening / closing body according to any one of claims 1 to 4, The joint portion 55 is characterized in that it has an indicator portion 59 on the outer surface of the winding shaft 17 that indicates the penetration position of the fastening member 19.

[0015] In this suspension structure for the winding mechanism, an indicator portion 59 is provided on the outer surface of the winding shaft 17 at the joint portion 55. The indicator portion 59 indicates the penetration position of the fastening member 19. The indicator portion 59 can be, for example, a V-groove along the axis of the winding shaft 17. The V-groove can be formed simultaneously by roll forming of the winding shaft 17. Alternatively, the indicator portion 59 may be a U-groove or a marking line. The fastening member 19 can be a screw, bolt, rivet, etc., as described above. When the fastening member 19 is a screw or bolt, the indicator portion 59 can be a marking line for machining female threads at a predetermined pitch along the axis of the winding shaft 17. When the fastening member 19 is a rivet, the indicator portion 59 can be a marking line for machining rivet insertion holes at a predetermined pitch along the axis of the winding shaft 17.

[0016] The suspension structure for the winding part of the opening / closing body according to claim 6 of the present invention is the suspension structure for the winding part of the opening / closing body according to any one of claims 1 to 4, The winding shaft 17 is characterized in that it has a pair of protrusions 61 on both sides of the joint 55 in the circumferential direction, which are formed by flattening the plate material 51 and projecting inward from the winding shaft 17.

[0017] In this suspension structure for the winding mechanism of the opening / closing body, the winding shaft 17 has a pair of projections 61 on both sides of the joint 55 in the circumferential direction, which protrude inward from the winding shaft 17. The pair of projections 61 are formed by flattening the plate material 51 that forms the outer circumferential surface 53 of the winding shaft 17, so that they protrude inward from the outer circumferential surface 53 in a rib-like manner and are formed continuously in a direction along the axis of the winding shaft 17. The through end of the fastening member 19, which penetrates the joint 55 from the outside, is positioned between this pair of projections 61. On the take-up shaft 17, a foil 41 formed with a slightly smaller outer shape is coaxially inserted inside a cross-section orthogonal to the axis. The foil 41 is rotationally driven by an opening / closing machine 35. The foil 41 has a recess 63 on its outer periphery where a pair of protrusions 61 engage. As a result, the take-up shaft 17 is rotationally driven forward and backward as the rotation from the foil 41 is transmitted from the recess 63 to the pair of protrusions 61. According to the suspension structure of this opening / closing body take-up part, by forming the pair of protrusions 61, while avoiding interference between the fastening member 19 passing through the joint part 55 and the foil 41, the forward and backward rotation from the foil 41 can be transmitted to the take-up shaft 17 using this pair of protrusions 61. That is, by having the protrusions 61 on both sides of the joint part 55, the fastening member 19 that fixes the suspension end edge 47 to the joint part 55 can pass through, and firm fastening and fixing can be performed.

[0018] The suspension structure of the opening / closing body take-up part according to claim 7 of the present invention is the suspension structure of the opening / closing body take-up part according to claim 5, wherein the take-up shaft 17 has a pair of protrusions 61 formed by flattening the plate material 51 on both sides of the joint part 55 in the circumferential direction and protruding inside the take-up shaft 17.

[0019] In the suspension structure of this opening / closing body take-up part, the take-up shaft 17 has a pair of protrusions 61 protruding inside the take-up shaft 17 on both sides of the joint part 55 in the circumferential direction. The pair of protrusions 61 are formed by flattening the plate material 51 forming the outer peripheral surface 53 of the take-up shaft 17, protruding rib-like from the outer peripheral surface 53 to the inside, and continuously formed in the direction along the axis of the take-up shaft 17. Between this pair of protrusions 61, the penetrating end of the fastening member 19 penetrating the joint part 55 from the outside is arranged. On the take-up shaft 17, a foil 41 formed with a slightly smaller outer shape is coaxially inserted inside a cross-section orthogonal to the axis. The foil 41 is rotationally driven by an opening / closing machine 35. The foil 41 has a recess 63 on its outer periphery where a pair of protrusions 61 engage. As a result, the take-up shaft 17 is rotationally driven forward and backward as the rotation from the foil 41 is transmitted from the recess 63 to the pair of protrusions 61. According to the suspension structure of the opening / closing body winding portion, by forming the pair of protrusions 61, while avoiding interference between the fastening member 19 passing through the joint portion 55 and the foil 41, the forward and reverse rotations from the foil 41 can be transmitted to the winding shaft 17 by utilizing this pair of protrusions 61. That is, by having the protrusions 61 on both sides of the joint portion 55, the fastening member 19 for fixing the suspension end edge 47 to the joint portion 55 can pass through, and strong fastening and fixing can be performed.

[0020] The suspension structure of the opening / closing body winding portion according to claim 8 of the present invention is the suspension structure of the opening / closing body winding portion according to claim 6, and the pair of protrusions 61 are engaged in a recess 63 recessed in the outer periphery of a foil 41 inserted into the winding shaft 17.

[0021] In this suspension structure of the opening / closing body winding portion, a foil 41 formed with a slightly smaller outer shape is coaxially inserted inside a cross-section orthogonal to the axis of the winding shaft 17. The foil 41 has a recess 63 on its outer periphery where the pair of protrusions 61 are engaged. The foil 41 is rotationally driven by an opening / closing machine 35. Thereby, the forward and reverse rotational drives from the foil 41 are transmitted to the winding shaft 17 through the pair of protrusions 61 from the recess 63.

[0022] The suspension structure of the opening / closing body winding portion according to claim 9 of the present invention is the suspension structure of the opening / closing body winding portion according to claim 7, and the pair of protrusions 61 are engaged in a recess 63 recessed in the outer periphery of a foil 41 inserted into the winding shaft 17.

[0023] In this suspension structure of the opening / closing body winding portion, a foil 41 formed with a slightly smaller outer shape is coaxially inserted inside a cross-section orthogonal to the axis of the winding shaft 17. The foil 41 has a recess 63 on its outer periphery where the pair of protrusions 61 are engaged. The foil 41 is rotationally driven by an opening / closing machine 35. Thereby, the forward and reverse rotational drives from the foil 41 are transmitted to the winding shaft 17 through the pair of protrusions 61 from the recess 63.

Advantages of the Invention

[0024] According to the suspension structure of the winding part of the opening / closing body described in claim 1 of the present invention, the material cost of the winding shaft itself can be reduced, a fire-resistant structure can be realized using the material, and the suspension end can be fastened and fixed from the outer circumference side of the winding shaft, making assembly work easy.

[0025] According to the suspension structure of the winding part of the opening / closing body described in claim 2 of the present invention, the thickness of the joint portion protrudes outside the outer surface of the winding shaft, making it easy to fix the suspension end in contact with the outer surface of the winding shaft, and allowing the suspension end to be firmly fixed to the joint without deforming it.

[0026] According to the suspension structure of the winding part of the opening / closing body described in claim 3 of the present invention, the number of thread engagements and screwing dimensions are secured at the joint portion which has been flattened and become similar to a thick plate material, making it possible to easily and strongly screw the suspension end of the opening / closing body.

[0027] According to the suspension structure of the winding part of the opening / closing body described in claim 4 of the present invention, the joint portion, which has been flattened to be similar to a thick plate material, has a sufficient number of thread engagements and screwing dimensions, and protrudes from the outer surface of the winding shaft, thereby enabling the suspension end of the opening / closing body to be easily and strongly screwed in.

[0028] According to the suspension structure of the winding part of the opening / closing body described in claim 5 of the present invention, by providing an indicator part at the joint, the fastening member can be accurately and easily fixed to a predetermined position at the joint.

[0029] According to the suspension structure of the winding part of the opening / closing body described in claim 6 of the present invention, forward and reverse rotation from the wheel can be transmitted to the winding shaft while avoiding interference between the fastening member and the wheel.

[0030] According to the suspension structure of the winding part of the opening / closing body described in claim 7 of the present invention, forward and reverse rotation from the wheel can be transmitted to the winding shaft while avoiding interference between the fastening member and the wheel.

[0031] According to the suspension structure of the winding part of the opening / closing body described in claim 8 of the present invention, the rotation of the wheel can be transmitted to the winding shaft. Furthermore, since a recess is formed in which the protrusion engages with the wheel, it becomes possible to construct a winding shaft with an inner diameter that is close to the outer diameter of the wheel.

[0032] According to the suspension structure of the winding part of the opening / closing body described in claim 9 of the present invention, the rotation of the wheel can be transmitted to the winding shaft. Furthermore, since a recess is formed in which the protrusion engages with the wheel, it becomes possible to construct a winding shaft with an inner diameter that is close to the outer diameter of the wheel. [Brief explanation of the drawing]

[0033] [Figure 1] This is an external perspective view of a window shutter device equipped with a suspension structure for the winding mechanism of the opening / closing part according to this embodiment. [Figure 2] This is a front view showing a portion of the shutter storage compartment cut across a vertical plane. [Figure 3] This is a side view showing the suspension structure between the opening / closing mechanism and the winding shaft, along with an enlarged view of its main components. [Figure 4] This is an exploded side view of the hinge end and joint. [Figure 5] This is a side view illustrating an example of an interlocking connection structure between a wheel and a winding shaft. [Figure 6] This is a magnified view of the key part, showing the joint area in Figure 5. [Modes for carrying out the invention]

[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is an external perspective view of a window shutter device 11 equipped with a suspension structure for the winding mechanism of the opening / closing body according to this embodiment. The suspension structure of the winding mechanism of the opening / closing body according to this embodiment is a structure in which an opening / closing body 15 that opens and closes the opening 13 of a building and a winding shaft 17 (see Figure 2) that winds up the opening / closing body 15 are connected by a fastening member 19 (see Figure 3). The suspension structure of the winding mechanism of the opening / closing body is suitable for use in, for example, a window shutter device 11.

[0035] The window shutter device 11 is installed on the outside of the sash window 21 that constitutes the window portion of the house. An opening 13 is provided in the exterior wall of the house. The sash window 21 is installed in this opening 13. The window shutter device 11 has a shutter curtain which is an opening and closing body 15. The shutter curtain 15 moves up and down on the outside of the exterior wall to cover the sash window 21. In this embodiment, the shutter curtain 15 is made up of multiple steel slats 23 that can improve fire resistance performance.

[0036] The shutter curtain 15 is constructed by connecting multiple slats 23 in a windable planar shape by engaging the edges of adjacent slats 23 along their longitudinal directions. A base plate 25 is attached to the end of the shutter curtain 15 in the direction of extension. The base plate 25 sits on the lower frame 27 when the shutter curtain 15 is lowered. The shutter curtain 15 is guided up and down by a pair of guide rails 28 provided on the left and right sides of the sash window 21. The guide rails 28 extend in the direction of up and down of the shutter curtain 15 and guide the side edges of the shutter curtain 15 by sandwiching them from the front and back. Each of the pair of guide rails 28 is fixed to the inside of a pair of outer frames 29 attached to the exterior wall on the left and right sides of the sash window 21.

[0037] A pair of outer frames 29 extend in the direction of the up and down movement of the shutter curtain, and their lower ends are connected by a lower frame 27. At their upper ends, these pairs of outer frames 29 support a portion of the load in the shutter storage section 31. The shutter storage section 31 is formed in a substantially rectangular parallelepiped shape that extends in the direction of the opening of the sash window 21. Decorative covers that protrude slightly outward from the outer frames 29 may be attached to the side plates at both longitudinal ends of the shutter storage section 31.

[0038] An opening for the shutter curtain 15 in the guide rail 28 is provided at the upper end of the pair of outer frames 29. This opening is located inside the shutter storage section 31, which is placed on the upper end of the outer frame 29. The upper ends of the pair of outer frames 29 are fixed by an upper frame (not shown). The upper frame is a so-called lintel. The shutter storage section 31 is mounted above this lintel.

[0039] Figure 2 is a front view of a portion of the shutter storage section 31, cut in half vertically. The shutter storage section 31 is provided with brackets 33 on both sides. A tubular motor 35, which is an opening and closing mechanism, is fixed to one bracket 33. A fixed shaft 37 is fixed to the other bracket 33. The rotating shaft 39 of the tubular motor 35 and the fixed shaft 37 are arranged coaxially.

[0040] The tubular motor 35 is equipped with a reduction gear, which reduces the torque by a predetermined ratio, causing the rotating shaft 39 to rotate with a predetermined torque. Wheels 41 are rotatably mounted on both ends of the fixed shaft 37 via bearings. Wheels 41 and 43 of the same diameter are also rotatably mounted on the rotating shaft 39 via bearings. Near the fixed part of the tubular motor 35, a rotating body 45 (limit ring) of the same diameter as the wheels 41 is provided. This rotating body 45 is not connected to the rotating shaft 39 that rotates when the tubular motor is driven, and is freely rotatable.

[0041] A hollow winding shaft 17 is fixed to the outer circumference of the wheels 41, 43 and the rotating body 45 as a winding member for winding up the shutter curtain 15. One end of the upper end of the shutter curtain 15 is connected to the outer circumference of this winding shaft 17 via a suspension edge 47 (see Figure 3), which is a suspension slat. The suspension edge 47 is a slat that is the upper end (one end) of the slats 23 that make up the shutter curtain 15. As shown in the figure, both ends along the longitudinal direction are formed in the same way as the other slats 23, but the shape of the slat body portion sandwiched between these edges is different from the other slats 23, and it has a mounting plate portion 48 that protrudes in the direction toward the inside of the winding, and preferably the mounting plate portion 48 is formed in the shape of a flat plate. In addition, the suspension edge 47 may have the same longitudinal length as the other slats 23, or it may be formed to be shorter than the other slats 23 and have a segmented structure in which multiple pieces are arranged in the longitudinal direction of the slats 23, or it may have a shape that includes an edge that has a connecting portion with the slats 23 and an edge that is formed in the shape of a flat plate, and it may have a mounting plate portion 48 through which the fastening member 19 described later passes, and it may be configured to be the upper end of the shutter curtain 15.

[0042] Furthermore, a winding spring 49 (balance spring) is provided on the fixed shaft 37. This winding spring 49 is a torsion spring biased in the rotational direction of the winding shaft 17 when winding up the shutter curtain 15, allowing the shutter curtain 15 to be wound up with little force. Therefore, by providing this winding spring 49, the load during winding is reduced, and the tubular motor 35 is made smaller as a result. In this way, the window shutter device 11 is made smaller and simpler overall by using a tubular motor 35 as an electric opener and closed device and by incorporating a winding spring 49.

[0043] Figure 3 is a side view showing the suspension structure between the opening / closing body (shutter curtain) 15 and the winding shaft 17, along with an enlarged view of its main parts. Incidentally, the winding shaft 17 of the window shutter device 11 is manufactured as a hollow pipe formed by roll forming, with both ends of a sheet metal 51 press-joined (seamed). In this embodiment, the winding shaft 17 is formed to have a circular (round) cross-section by roll forming. However, the suspension structure of the winding part of the opening / closing body may have a cross-sectional shape other than circular, for example, a polygon. The winding shaft 17 is formed by roll forming, and a joint portion 55 is provided on the outer surface 53 (see Figure 4). The joint portion 55 is provided continuously in the direction along the axis of the winding shaft 17 by seaming. Seaming is a processing method in which both ends of the sheet metal 51 are bent and joined, and is also called seam-folded joining. The suspension end 47 of the shutter curtain 15 is fixed to this joint portion 55 by a fastening member 19.

[0044] The fastening member 19 may be a screw, bolt, rivet, or the like. In this embodiment, the fastening member 19 is a screw with a male thread formed on the outer circumference of the shaft portion 57. The shutter curtain 15 is screwed into the joint portion 55 at the suspension end 47 by this screw.

[0045] Figure 4 is an exploded side view of the suspension end 47 and the joint 55. The plate material 51 of the winding shaft 17 is joined by seaming, with both ends folded in opposite directions and overlapped. The overlapping portion is flattened in the thickness direction of the plate. Each folded portion can be hemmed (also called a "scarf fold"). At the joint 55, the plate material 51 is tightly joined to each other by hemming both ends in opposite directions and overlapping, resulting in a quadruple layer (four layers stacked).

[0046] The bottom layer of these stacked plates 51 is approximately the outer surface 53 of the winding shaft 17. Therefore, the joint 55 protrudes approximately 3t from the outer surface 53 of the winding shaft 17, with the plates 51 of thickness t stacked approximately three times. The winding shaft 17 is positioned with the plates 51 on its outer surface 53, and the joint 55 protrudes outward from the outer surface 53 of the winding shaft 17. The front and back surfaces of the joint 55 are flattened so that they are parallel to the tangent to the outer surface 53.

[0047] The overlap length S of each edge of the joint 55 is set to be greater than the outer diameter d of the shaft portion 57 of the fastening member 19 that penetrates the joint 55 in the thickness direction of the plate. More preferably, the overlap length S is twice or more the outer diameter d of the shaft portion 57. In this case, the clearance dimension from the end of the joint 55 to the center of the shaft portion 57 is ensured to be d or more. As a result, the hanging edge 47 of the shutter curtain 15 can be firmly fastened to the joint 55 without the screws that have passed through coming out of the joint 55.

[0048] Preferably, the joint 55 has an indicator portion 59 on the outer surface of the winding shaft 17 that indicates the penetration position of the fastening member 19. In this embodiment, the indicator portion 59 is formed by a V-groove along the axis of the winding shaft 17. The V-groove can be formed simultaneously when processing the joint 55 by roll forming. The V-groove is formed at a position half the fold length S (S / 2) in the joint 55.

[0049] Furthermore, the winding shaft 17 has a pair of protrusions 61 on both sides of the joint 55 in the circumferential direction, which are formed by flattening (hemming) the plate material 51 and projecting inward in a rib-like manner.

[0050] Figure 5 is a side view showing an example of an interlocking connection structure between the wheel 41 and the winding shaft 17. A wheel 41, formed with a slightly smaller outer diameter, is coaxially inserted into the inside of a cross-section perpendicular to the axis of the winding shaft 17. The wheel 41 is rotationally driven by an opening / closing mechanism 35. The wheel 41 has recesses 63 on its outer circumference into which a pair of protrusions 61 engage. Multiple recesses 63 are formed on the outer circumference of the wheel 41 at equal intervals in the circumferential direction. In this embodiment, four recesses 63 are formed at equal intervals.

[0051] Of the four recesses 63, one is engaged with a pair of protrusions 61 of the winding shaft 17, while the other three recesses 63 are engaged with convex portions 65 formed by bending the plate material 51 of the winding shaft 17 inward. As a result, the rotation from the wheel 41 is transmitted from the recess 63 to the pair of protrusions 61 and to each convex portion 65, and the forward and reverse rotation drive of the wheel 41 is transmitted to the winding shaft 17, causing the winding shaft 17 to rotate in both forward and reverse directions. Note that the position of the joint 55 between the wheel 41 and the winding shaft 17 may be other locations, by engaging the four convex portions 65 formed on the winding shaft 17 with the insides of the four recesses 63 of the wheel 41. In this case, the corresponding location on the wheel 41 that corresponds to the joint 55 is omitted on the winding shaft 17 side, and a recess or the like is provided at the corresponding location on the wheel 41 to avoid interference with the shaft 57. By forming multiple protrusions 65 on the winding shaft 17 in this way, the rigidity and straightness of the winding shaft 17 are improved, resulting in a hollow pipe that is less prone to bending in the longitudinal direction. Furthermore, since the protrusions 61 and 65 are formed on the inside of the winding shaft 17 and the wheel 41 has a recess 63 on its outer circumference, the outer diameter of the wheel 41 and the inner diameter of the winding shaft 17 can be made closer together, resulting in a structure that reduces wasted space.

[0052] Figure 6 is an enlarged view of the main part, showing the joint 55 in Figure 5. The pair of protrusions 61 provided on the joint 55 engage with the recess 63 of the wheel 41 and are positioned to sandwich the shaft portion 57 of the fastening member 19 between them. The tip of the shaft portion 57 sandwiched between the pair of protrusions 61 is spaced apart from the bottom surface 67 of the recess 63. In other words, by positioning the fastening member 19 between the pair of protrusions 61, it does not interfere with the wheel 41 in the circumferential and radial directions of the winding shaft 17. Furthermore, having protrusions 61 on both sides of the joint 55 allows the fastening member 19, which fixes the suspension end 47 to the joint 55, to pass through, enabling strong fastening and fixing.

[0053] Next, I will explain the function of the above-described configuration.

[0054] In the suspension structure of the winding mechanism of the opening / closing body according to this embodiment, the winding shaft 17 is made into a hollow pipe by roll forming. The hollow pipe-shaped winding shaft 17 has a joint 55 formed by folding both ends of a plate material 51 in opposite directions and overlapping them, and then flattening the overlapping portion in the thickness direction of the plate. The joint 55 is continuously thicker in the direction along the axis of the winding shaft 17. Therefore, the thickness of this joint 55 is equivalent to the thickness of four stacked plates 51 that form the outer circumference of the winding shaft 17. As a result, the joint 55 satisfies the plate thickness required for fastening the fastening member 19. For example, if the plate material 51 is 0.4 mm thick, the joint 55 will be 1.6 mm thick, and if the plate material 51 is 0.6 mm thick, the joint 55 will be 2.4 mm thick.

[0055] Furthermore, the overlap length of each edge of the joint 55 is set to be at least greater than the outer diameter d of the shaft portion 57 of the fastening member 19. As a result, the shaft portion 57 penetrates the joint 55, which is made thicker by stacking four thin plates 51. The fastening member 19 may be a screw, bolt, rivet, etc. The hanging edge 47 of the shutter curtain 15 is superimposed on this joint 55, and the shaft portion 57 of the fastening member 19 penetrates both the hanging edge 47 and the joint 55, allowing it to be firmly fastened and fixed to the joint 55.

[0056] In this suspension structure for the winding mechanism of the opening / closing body, even if the winding shaft 17 is made of thin plate material 51, the overlapping of multiple plate materials 51 at the joint 55 allows for easy fastening of the suspension edge 47 of the shutter curtain 15 with sufficient fixing strength. As a result, the suspension structure for the winding mechanism of the opening / closing body allows the winding shaft 17 to be made of inexpensive steel instead of expensive aluminum. By using steel for the winding shaft 17, fire resistance can be improved compared to aluminum. In addition, since the fastening member 19 can be fastened from the outer circumference of the winding shaft 17, there is no need to place a nut inside the winding shaft 17, making the fastening work easy.

[0057] In this suspension structure for the winding mechanism of the opening / closing unit, the shutter curtain 15 is wound onto the outer surface 53 of the winding shaft 17. The winding shaft 17 is formed by roll forming, as described above. Roll forming involves passing a strip-shaped sheet material 51 through several sets of forming rolls arranged in a row to continuously form a predetermined cross-section (polygon or circle). The formed winding shaft 17 has both ends folded in opposite directions and overlapped, and the overlapping portion is flattened in the thickness direction to form a joint 55.

[0058] This joint 55 is positioned outside the winding shaft 17, beyond the plate material 51 that forms the outer circumferential surface 53 of the winding shaft 17. Therefore, the joint 55 does not have a recessed shape that is recessed inward from the outer circumferential surface 53 of the winding shaft 17. As a result, the hanging edge 47 of the shutter curtain 15, which is fixed to the outer circumferential surface 53, can be fixed by the fastening member 19 in close contact with the joint 55. Therefore, the shutter curtain 15 does not experience deformation of the hanging edge 47 due to fastening the hanging edge 47 to the recessed joint 55. Consequently, the thickness of the joint 55 extends beyond the outer circumferential surface 53 of the winding shaft 17, allowing the hanging edge 47 that contacts the outer circumferential surface 53 of the winding shaft 17 to be firmly fixed to the joint 55 without deformation.

[0059] In this suspension structure for the winding mechanism of the opening / closing body, the fastening member 19 is, for example, a bolt or screw having a male thread on the shaft portion 57. Furthermore, the screw may be a self-tapping screw. When the fastening member 19 is a bolt or screw, a female thread is formed in the thickness direction of the joint portion 55. The female thread is formed so as to penetrate the joint portion 55, which is formed by stacking and flattening four plate materials 51. The shutter curtain 15 is screwed to the joint portion 55 by the fastening member 19, which has penetrated the suspension edge 47, screwing into this female thread from the outside of the winding shaft 17 and passing through the joint portion 55. As a result, the number of thread engagements (screw-in dimensions) is secured to the joint portion 55, which has been flattened and is similar to a thick plate material, allowing the suspension edge 47 of the shutter curtain 15 to be easily and strongly screwed in.

[0060] In this suspension structure for the winding mechanism of the opening / closing body, the winding shaft 17 has a pair of projections 61 on both sides of the joint 55 in the circumferential direction, which protrude inward from the winding shaft 17. The pair of projections 61 are formed by flattening the plate material 51 that forms the outer circumferential surface 53 of the winding shaft 17, so that they protrude inward from the outer circumferential surface 53 and are formed continuously in a direction along the axis of the winding shaft 17. Between this pair of projections 61, the through end of the fastening member 19, which penetrates the joint 55 from the outside, is positioned.

[0061] A wheel 41, formed with a slightly smaller outer shape, is coaxially inserted into the inside of the winding shaft 17, in a cross-section perpendicular to the axis. The wheel 41 is rotationally driven by an opening / closing mechanism 35. The wheel 41 has a recess 63 on its outer circumference into which a pair of protrusions 61 engage. As a result, the winding shaft 17 is driven to rotate in both forward and reverse directions by the rotation from the wheel 41 being transmitted from the recess 63 to the pair of protrusions 61.

[0062] In this suspension structure for the winding part of the opening / closing body, by forming a pair of protrusions 61, interference between the fastening member 19 that penetrates the joint 55 and the wheel 41 can be avoided, and the forward and reverse rotation from the wheel 41 can be transmitted to the winding shaft 17 using this pair of protrusions 61.

[0063] Furthermore, in the suspension structure of this opening / closing winding section, the joint 55 has an indicator portion 59 on the outer surface of the winding shaft 17. The indicator portion 59 indicates the penetration position of the fastening member 19. The indicator portion 59 can be, for example, a V-groove along the axis of the winding shaft 17. The V-groove can be formed simultaneously by roll forming of the winding shaft 17. The indicator portion 59 may also be a U-groove or simply a marking line. The fastening member 19 can be a screw, bolt, rivet, etc., as described above. When the fastening member 19 is a screw or bolt, the indicator portion 59 can be a marking line when machining female threads at a predetermined pitch along the axis of the winding shaft 17. When the fastening member 19 is a rivet, the indicator portion 59 can be a marking line when machining rivet insertion holes at a predetermined pitch along the axis of the winding shaft 17. As a result, by providing an indicator portion 59 on the joint portion 55, the fastening member 19 can be accurately and easily fixed to a predetermined position on the joint portion 55.

[0064] Therefore, according to the suspension structure of the winding part of the opening / closing body as described in this embodiment, the material cost of the winding shaft 17 can be reduced, a fire-resistant structure can be realized, and assembly work can be easily performed. [Explanation of symbols]

[0065] 13…Opening 15…Opening / closing mechanism (shutter curtain) 17…winding shaft 19… Fastening member 41... Foil 47...hanging edge 51...Plate material 53...Outer surface 55…Joint part 57... Shaft 59…Indicator section 61… protrusion 63…recess S...Fold length d... Outer diameter of the shaft

Claims

1. A suspension structure for an opening / closing mechanism winding section, which connects an opening / closing mechanism that opens and closes an opening in a building with a winding shaft that winds up the opening / closing mechanism, using a fastening member. The winding shaft is a hollow pipe formed by joining the edges of both ends of a plate material. The aforementioned edges have a joint formed by folding each edge in opposite directions and overlapping them, and flattening the overlapping portion in the thickness direction of the plate. The aforementioned joint portion has a folded length that serves as an overlap for each of the edges, and the fold length is greater than the outer diameter of the shaft portion of the fastening member that penetrates the joint portion in the plate thickness direction. The suspension structure for the winding part of the opening / closing body is characterized in that the suspension end edge of the opening / closing body is overlapped with the joint and fastened and fixed by the fastening member that penetrates the suspension end edge.

2. The suspension structure for the winding part of an opening / closing body according to claim 1, characterized in that the plate material becomes the outer circumferential surface of the winding shaft, and the joint portion is positioned outside the winding shaft beyond the outer circumferential surface.

3. The suspension structure for the winding part of the opening / closing body according to claim 1, characterized in that the fastening member has a male screw formed on the outer circumference of the shaft portion, and the suspension end edge through which the male screw passes is screwed to the joint portion.

4. The suspension structure for the winding part of the opening / closing body according to claim 2, characterized in that the fastening member has a male screw formed on the outer circumference of the shaft portion, and the suspension end edge through which the male screw passes is screwed to the joint portion.

5. The suspension structure for an opening / closing body winding section according to any one of claims 1 to 4, characterized in that the joint portion has an indicator portion on the outer surface of the winding shaft that indicates the penetration position of the fastening member.

6. The suspension structure for the winding part of an opening / closing body according to any one of claims 1 to 4, characterized in that the winding shaft has a pair of protrusions on both sides of the joint in the circumferential direction, formed by flattening the plate material and projecting inward from the winding shaft.

7. The suspension structure for the winding part of the opening / closing body according to claim 5, characterized in that the winding shaft has a pair of protrusions on both sides of the joint in the circumferential direction, which are formed by flattening the plate material and projecting inward from the winding shaft.

8. The suspension structure for the winding part of an opening / closing body according to claim 6, characterized in that the pair of protrusions engage with recesses formed in the outer circumference of the wheel inserted into the winding shaft.

9. The suspension structure for the winding part of the opening / closing body according to claim 7, characterized in that the pair of protrusions engage with recesses formed in the outer circumference of the wheel inserted into the winding shaft.

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