Opening and closing body device structure

Abstract

To provide an opening and closing body device structure capable of improving fireproof performance by preventing a wind-up part from dropping when a wind-up cylinder is burnt down due to fire.SOLUTION: An opening and closing body device structure comprises: an electric mechanism 41 cantilevered coaxially with a first support shaft 31 fixed to a first facing surface 29 on one side so as to be rotatable; a spring unit 43 cantilevered coaxially with a second support shaft 35 fixed to a second facing surface 33 on the other side so as to be rotatable; and an aluminum wind-up cylinder 47 that coaxially fixes the electric mechanism 41 and the spring unit 43 on the inner side and allows a shutter curtain 17 for opening and closing an opening to be wound around an outer periphery. The electric mechanism 41 has a driving side wheel 51 that rotates integrally with the wind-up cylinder 47. The spring unit 43 has an assisting side wheel 53 that rotates integrally with the wind-up cylinder 47. A bend restriction part 45, which restricts an intersection angle between a shaft line of the electric mechanism 41 and a shaft line of the spring unit 43 from becoming a prescribed angle, is provided between the driving side wheel 51 and the assisting side wheel 53.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a structure of an opening / closing body device. [Background technology]

[0002] The shutter device has a winding section whose both ends are supported by brackets on the building frame. The shutter curtain, which is the opening and closing body that opens and closes the opening of the building, is wound up on the winding section. If this winding section has a long shaft that runs along its entire length, it can have a structure in which both ends can be supported by bearings. However, if it has different mechanical parts on the same shaft, such as a drive part (electric mechanism) and an assist part (spring mechanism), whose rotations are not completely synchronized, it cannot have a common single-axis structure.

[0003] In such an opening / closing body device structure, the drive unit and the assisting unit are supported by one drive unit on one side of the building frame and the other assisting unit on the other side of the building frame, with their respective shaft ends fixed. The drive unit and the assisting unit, which are separated on the left and right, are fixed coaxially to the inside and integrally connected by a winding tube (also called a "winding drum") that winds the shutter curtain around its outer periphery. The winding tube is fixed to the drive unit and the assisting unit via wheels, and the drive rotational force and the assisting rotational force are transmitted to them, respectively.

[0004] This winding tube has an engagement structure that regulates the relative rotation with the multiple wheels fixed inside, so it has a complex cross-sectional shape rather than a simple cylinder.For this reason, the winding tube is made of aluminum, which allows for light weight and the ability to be given a complex cross-sectional shape (shape formability). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-214282 A (Fig. 1) Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the opening and closing body device, when a fire occurs when the shutter curtain is fully closed, the shutter curtain, guide rail, storage section, etc. are made of fire-resistant materials such as steel, so they have a fire-resistant structure, but the above-mentioned winding tube is made of aluminum material for the purpose of weight reduction and shape formability, so its fire resistance against heat is low. In other words, when heat or flames enter the storage section through the slit-shaped shutter curtain entrance and exit, when the fire-resistant shutter curtain is fully unrolled, that is, when the opening is fully closed, the winding tube is exposed and directly exposed to heat. The winding tube may soften or even melt due to high heat, and since the drive section and the assist section are supported by a cantilever, the gravity-direction stress is concentrated near the center of the winding tube due to their own weight, causing the winding tube to buckle and bend, and in the worst case, the winding tube, the drive section, and the assist section may fall due to their own weight.

[0007] The present invention has been made in consideration of the above-mentioned situation, and its object is to provide a structure for an opening / closing body device that can improve the fire resistance of the opening / closing body device by preventing the winding portion from falling when the winding tube softens, melts, or disappears due to fire or heat during a fire, etc. [Means for solving the problem]

[0008] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The structure of the opening / closing body device according to claim 1 of the present invention is a structure of an opening / closing body device comprising: a first support shaft 31 fixed to a first opposing surface 29 on one side of the opening 15 in the width direction; a second support shaft 35 fixed to a second opposing surface 33 on the other side; a drive section 41 supported by a cantilever so as to be coaxially rotatable on the first support shaft 31; an assist section 43 supported by a cantilever so as to be coaxially rotatable on the second support shaft 35; and a winding tube 47 which winds an opening / closing body 17 around its outer periphery and opens and closes the opening 15 with the drive section 41 and the assist section 43 fixed coaxially to the inside, The drive unit 41 has a drive side wheel 51 that rotates integrally with the winding tube 47, The assisting portion 43 has an assisting side wheel 53 which rotates integrally with the winding tube 47, A bending control section 45 is provided between the driving side wheel 51 and the assisting side wheel 53 to control the intersection angle θ between the axis of the driving section 41 and the axis of the assisting section 43 to be a predetermined angle.

[0009] In the structure of this opening / closing body device, a first support shaft 31 is fixed to the first opposing surface 29 on one side of the opening 15 in the width direction, and a second support shaft 35 is fixed to the second opposing surface 33 on the other side. A driving unit 41 is coaxially supported by the first support shaft 31 in a cantilevered manner so as to be rotatable. A supporting unit 43 is coaxially supported by the second support shaft 35 in a cantilevered manner so as to be rotatable. The driving unit 41 and the supporting unit 43 are coaxially fixed to the inside of an aluminum winding tube 47. In other words, the driving unit 41 and the supporting unit 43, which are each supported by a cantilevered manner, are fixed to the inside of the winding tube 47 to form an integrated uniaxial unit, and both ends are supported. The opening / closing body 17 is wound around the outer periphery of the winding tube 47. The driving unit 41 has a coaxial driving side wheel 51 that rotates and drives the winding tube 47. The outer periphery of the driving side wheel 51 of the driving unit 41 is fixed to the inner periphery of the winding tube 47. The assisting unit 43 has a coaxial assisting side wheel 53 that rotates together with the winding tube 47 to transmit the accumulated assisting force to the winding tube 47. The outer periphery of the assisting side wheel 53 of the assisting unit 43 is fixed to the inner periphery of the winding tube 47. The driving side wheel 51 and the assisting side wheel 53 are separated from each other at approximately the center of the axis of the winding tube 47. That is, the driving side wheel 51 and the assisting side wheel 53 are not in contact with each other and are not connected to each other, and are connected only through the winding tube 47 which constitutes the outer shell. Therefore, when the winding tube 47 is softened or melted by high heat such as a fire, the driving part 41 and the assisting part 43 are no longer an integrated uniaxial unit, and each has a cantilever support structure. In this process, when stress is concentrated near the approximately center of the winding tube 47, that is, when a force is applied in the falling direction which is the direction of gravity, the winding tube 47 is bent in a buckling manner, and in the worst case, the driving part 41 and the assisting part 43 may fall together with the winding tube 47 due to their own weight. In the structure of the opening / closing body device, during the process of softening and melting of the winding tube 47, stress is concentrated near the center of the winding tube 47, and even if the winding tube 47 buckles or melts and disappears, a bending control section 45 is provided to control the intersection angle θ between the axis of the drive section 41 and the axis of the assisting section 43 to be a predetermined angle. Here, the predetermined crossing angle θ can be referred to as, for example, a maximum crossing angle θmax. The maximum crossing angle θmax is a bending angle when the driving side wheel 51 and the assisting side wheel 53 are in a cantilever support structure, that is, when they are separated (disconnected). The bending restriction part 45 restricts the crossing angle θ between the axis of the driving part 41 and the axis of the assisting part 43 to be a predetermined angle, thereby making it possible to maintain the driving part 41 and the assisting part 43 as an integrated uniaxial unit, that is, in a state in which they are not separated, regardless of the presence or absence of the winding tube 47. As a result, in the structure of the opening / closing body device, when the winding tube 47 is softened, melted, or lost due to heat such as a fire, the winding part 23 composed of the driving part 41 and the assisting part 43 is prevented from falling, thereby improving the fireproof performance of the opening / closing body device.

[0010] The structure of the opening / closing body device according to claim 2 of the present invention is the structure of the opening / closing body device according to claim 1, The bend restricting portion 45 has a drive-side shaft end portion and an assist-side shaft end portion which are inserted coaxially in the horizontal direction, The drive-side shaft end and the assist-side shaft end are engaged with each other with a predetermined axial distance Ks, and the crossing angle θ is prevented from becoming the predetermined angle, thereby maintaining the connection state.

[0011] In this opening / closing body device structure, the bend restriction portion 45 has a drive-side shaft end portion and an assistant-side shaft end portion which are inserted coaxially in the horizontal direction. The drive-side shaft end portion is fixed integrally with the drive-side wheel 51 and rotates integrally with the drive-side wheel 51. On the other hand, the assistant-side shaft end portion passes coaxially through the assistant-side wheel 53 and becomes non-rotating integrally with the second support shaft 35. The assistant-side shaft end portion may be on the extended end side of the extended second support shaft 35. The drive-side shaft end and the assistant-side shaft end are in an insertion / receiving structure. The drive-side shaft end and the assistant-side shaft end are hooked with a predetermined axial length Ks by this insertion / receiving structure. It is preferable that this insertion / receiving structure is non-contact. In other words, the bend restricting portion 45 is structured to permit rotation of the drive-side shaft end while restricting bending so that the assistant-side shaft end is a fixed shaft and the drive-side shaft end and the assistant-side shaft end do not form the maximum crossing angle θmax. Note that the drive-side shaft end and the assistant-side shaft end may be configured so that, for example, one is fixed to the inner ring of a bearing and the other is fixed to the outer ring, so that the rotating shaft and the fixed shaft are coaxially connected.

[0012] The structure of an opening / closing body device according to claim 3 of the present invention is the structure of the opening / closing body device according to claim 2, one of the drive-side shaft end portion and the assist-side shaft end portion is a convex portion and the other is a concave portion, The recess is formed between at least a pair of upper and lower parallel protrusions 63, The protrusion is inserted into the recess with the engagement allowance Ks.

[0013] In the structure of this opening / closing body device, one of the driving side shaft end and the assisting side shaft end is a convex portion and the other is a concave portion. The concave portion is formed between at least a pair of upper and lower parallel protrusions 63. The convex portion is inserted into the concave portion with the above-mentioned engagement allowance Ks. The concave portion is composed of at least a pair of upper and lower parallel protrusions 63, and by inserting the convex portion therebetween with the engagement allowance Ks, it becomes possible to sandwich the convex portion from above and below when the mutual axes intersect. In other words, the bend restricting portion 45 restricts bending so that the axes of the driving side shaft end and the assisting side shaft end do not form a predetermined crossing angle θ by inserting the convex portion and the concave portion with the engagement allowance Ks.

[0014] The structure of an opening / closing body device according to claim 4 of the present invention is the structure of the opening / closing body device according to claim 3, The protruding portion is a shaft member 69, The recess is characterized in that it is a pipe member 65 that allows the shaft member 69 to be inserted.

[0015] In the structure of this opening / closing body device, the convex portion is the shaft member 69, and the concave portion is the pipe member 65. The shaft member 69 and the pipe member 65 can be inserted and received by setting the outer diameter of the shaft member 69 to be smaller than the inner diameter of the pipe member 65. The shaft member 69 is inserted into the pipe member 65 with the engagement allowance Ks, so that the axes of both are restricted to a predetermined crossing angle. In this case, the crossing angle varies depending on the inner and outer diameter difference between the outer diameter of the shaft member 69 and the inner diameter of the pipe member 65, and the engagement allowance Ks. That is, the crossing angle is in a proportional relationship such that the smaller the inner and outer diameter difference is, the smaller the crossing angle is, and the larger the inner and outer diameter difference is, the larger the crossing angle is. Also, the crossing angle θ is in an inversely proportional relationship such that the smaller the engagement allowance Ks is, the larger the crossing angle is, and the larger the engagement allowance Ks is, the smaller the crossing angle is. There is a correlation between the inner and outer diameter difference and the engagement allowance Ks. Even if the inner and outer diameter difference is small, if the engagement allowance Ks is small, the crossing angle θ may not be regulated. On the other hand, even if the inner and outer diameter difference is large, the crossing angle θ may be regulated if the engagement allowance Ks is large. In an insertion and receiving structure in which the shaft member 69 is inserted with a predetermined inner and outer diameter difference, as the engagement allowance Ks decreases, the crossing angle θ increases, and when the maximum crossing angle θmax is reached, the pipe member 65 cannot maintain the vertical clamping state and comes off, causing the connection between the shaft member 69 and the pipe member 65 to be released. In this specification, the predetermined crossing angle at this time is referred to as the maximum crossing angle θmax. In other words, the bend restricting portion 45 is configured to restrict the shaft member 69 and the pipe member 65 from bending at the maximum crossing angle θmax.

[0016] The structure of an opening / closing body device according to claim 5 of the present invention is the structure of an opening / closing body device according to claim 4, The drive side shaft end portion is the shaft member 69, The auxiliary side shaft end portion is characterized by being the pipe member 65.

[0017] In this opening / closing body device structure, the driving side shaft end is the shaft member 69, and the assisting side shaft end is the pipe member 65. As a result, the shaft member 69 is fixed integrally to the driving side wheel 51 and rotates integrally therewith. Meanwhile, the pipe member 65 coaxially passes through the assisting side wheel 53 and is non-rotating integrally with the second support shaft 35. Therefore, in the opening / closing body device structure, the rotating shaft member 69 fixed coaxially with the driving side wheel 51 is inserted into the end of the pipe member 65 coaxially passing through the assisting section 43. The insertion distance of the shaft member 69 into the pipe member 65 is the overlap allowance Ks. The bending restriction section 45 consisting of the shaft member 69 and the pipe member 65 is inserted with an engagement allowance Ks that does not reach the maximum cross angle θmax, so that the shaft member 69 and the pipe member 65 do not come off. That is, the drive section 41 and the assist section 43 reach the maximum cross angle θmax approximately at the center of the winding section 23, and each of them is supported in a cantilever state, thereby restricting them from falling.

[0018] The structure of an opening / closing body device according to claim 6 of the present invention is the structure of an opening / closing body device according to claim 4 or 5, The shaft member 69 and the pipe member 65 are inserted into each other with a predetermined gap therebetween at the engagement allowance Ks.

[0019] In the structure of this opening / closing body device, the shaft member 69 and the pipe member 65 are inserted with an engagement allowance Ks, and there is a predetermined gap between the shaft member 69 and the pipe member 65. That is, there is an inner / outer diameter difference between the outer diameter of the shaft member 69 and the inner diameter of the pipe member 65, and the shaft member 69 is inserted into the pipe member 65. By having the gap, which is the inner / outer diameter difference, and being inserted with the engagement allowance Ks, the shaft member 69 and the pipe member 65 are restricted so that their axes cross at a predetermined angle (i.e., the maximum cross angle θmax). The cross angle θ changes depending on this gap, that is, the inner / outer diameter difference between the outer diameter of the shaft member 69 and the inner diameter of the pipe member 65, and the engagement allowance Ks. That is, the cross angle θ is in a proportional relationship such that it is smaller when the inner / outer diameter difference (gap) is small, and is larger when the inner / outer diameter difference (gap) is large. Also, the cross angle θ is in an inversely proportional relationship such that it is larger when the engagement allowance Ks is small, and is smaller when the engagement allowance Ks is large. The gap may be coated or filled with grease or the like. Effect of the Invention

[0020] According to the structure of the opening / closing body device described in claim 1 of the present invention, a bend control section is provided between the drive side wheel and the assisting side wheel to control the intersection angle between the axis of the drive section and the axis of the assisting section to be a predetermined angle.Therefore, when the winding tube softens, melts, or disappears due to heat or flames caused by a fire, etc., the winding section is prevented from falling, thereby improving the fire resistance of the opening / closing body device.

[0021] According to the structure of the opening / closing body device described in claim 2 of the present invention, the drive side shaft end and the assistant side shaft end are caught by the bend regulating portion with a predetermined distance in the axial direction, and bending that forms a predetermined cross angle is regulated, so that the drive side shaft end and the assistant side shaft end are maintained in a connected state, thereby preventing the winding portion from falling.

[0022] According to the structure of the opening / closing body device described in claim 3 of the present invention, the drive side shaft end and the assistant side shaft end are convex and concave portions, and the concave portion is formed between at least a pair of upper and lower parallel protrusions, and the convex portion is inserted into the concave portion with an engagement margin, so that the convex portion can be clamped from above and below by the pair of upper and lower parallel protrusions, and the axes of the drive side shaft end and the assistant side shaft end can be regulated to form a predetermined crossing angle.

[0023] According to the structure of the opening / closing body device described in claim 4 of the present invention, the concave portion is a pipe member and the convex portion is an axial member, so that by inserting the axial member into the pipe member, the axial member can be clamped from above and below with a simple structure, and the axes of the driving side shaft end and the assisting side shaft end can be regulated to form a predetermined intersecting angle.

[0024] According to the structure of the opening / closing body device described in claim 5 of the present invention, since the drive side shaft end is a shaft member and the assisting side shaft end is a pipe member, the existing pipe structure provided in the assisting part can be utilized as a recess, thereby reducing additional parts and easily and inexpensively improving the fire resistance of the opening / closing body device.

[0025] According to the structure of the opening / closing body device of claim 6 of the present invention, the shaft member and the pipe member are inserted with the engagement allowance and have a predetermined gap, and the shaft member is inserted into the pipe member, so that the axes of both members do not intersect at a predetermined angle. Also, the gap can be coated or filled with grease or the like. [Brief description of the drawings]

[0026] [Figure 1] 1 is a front view of an exterior of an opening / closing body device having an opening / closing body device structure according to the present embodiment. [Diagram 2] FIG. 4 is a front view showing a portion of the winding section cut away. [Diagram 3] 13 is a front view showing the winding section, which has been prevented from falling by the bend restricting section after the winding tube has disappeared, together with an enlarged view of the main part. FIG. [Figure 4] 11A to 11C are exploded perspective views of essential parts showing variations of the bending restriction portion. [Diagram 5]13 is a schematic diagram of a bend restricting portion that prevents the winding portion from falling after the winding tube disappears. FIG. [Figure 6] 5 is a schematic diagram illustrating the relationship between the outer diameter of the shaft member and the inner diameter of the pipe member and the maximum intersection angle. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the exterior of an opening / closing body device having a structure of an opening / closing body device according to this embodiment. The structure of the opening / closing body device according to this embodiment is suitable for use in a shutter device 11, which is an opening / closing body device. The shutter device 11 is installed in an opening 15 of a building having a pair of guide rails 13 on the left and right. The shutter device 11 includes a shutter curtain 17, which is an opening / closing body, as a constituent member. The shutter curtain 17 is guided so as to be able to move up and down freely in the opening 15 by inserting both sides in the width direction of the opening 15 into the pair of guide rails 13.

[0028] The shutter curtain 17 is formed by connecting a plurality of slats 19, each long and narrow in the width direction of the opening 15, in the opening / closing direction (vertical direction) of the opening 15. The slats 19 are made of steel, which is a fireproof material. The upper and lower parts of the slats 19 are formed with connecting parts that can engage with each other, i.e., curled parts. The shutter curtain 17 connects the slats to each other so that they can be bent vertically with the upper and lower curled parts as joint parts by engaging the lower curled part of the upper slat with the upper curled part of the lower slat, moving them along the slat extension direction, and slidingly engaging them from the lateral direction. For example, the edge of the upper curled part of the slats is cut into a substantially L-shape to form a cutout part, and the lower curled part has a cutout part formed inside the part corresponding to the cutout part. The end of the lower curled part with the cutout part is bent inward and crimped to prevent the slats from moving horizontally.

[0029] The shutter device 11 is provided with a storage case 21 above the opening 15. The storage case 21 houses a winding section 23 constituting a winding mechanism. The winding section 23 is driven by an electric motor (not shown) and winds and unwinds the shutter curtain 17 to raise and lower (open and close). The shutter curtain 17 wound up by the winding section 23 is unwound and wound down from the outer diameter side of the winding. The shutter curtain 17 has a seat plate 25 at the opening and closing tip. The seat plate 25 is connected to the lower end, which is the tip of the shutter curtain 17, by a seat plate connecting slat at the lowest end having a seat plate connecting structure. When the shutter curtain 17 fully closes the opening 15, the seat plate 25 lands on a lower frame 27 of an opening frame provided in the opening 15.

[0030] The opening / closing body device has a structure including a first support shaft 31 fixed to a first opposing surface 29 on one side of the opening 15 in the width direction, and a second support shaft 35 fixed to a second opposing surface 33 on the other side. The first opposing surface 29 and the second opposing surface 33 are, for example, inner wall surfaces facing each other on the inside of a pair of brackets 37 protruding from the building structure on the left and right sides of the upper edge of the opening 15. The first support shaft 31 and the second support shaft 35 are each fixed non-rotatably to a bearing 39 attached to the building structure via the bracket 37.

[0031] An electric mechanism 41, which is a drive unit, and a spring unit 43, which is a support unit, are coaxially arranged in the winding unit 23. A bending restriction unit 45 is provided between the electric mechanism 41 and the spring unit 43. The electric mechanism 41, the spring unit 43, and the bending restriction unit 45 are housed inside a winding tube 47 made of aluminum.

[0032] FIG. 2 is a front view of the winding section 23 with a portion thereof cut away. The first support shaft 31 is the shaft of an electric mechanism 41, which is cantilevered by a bearing 39. The electric mechanism 41 houses an opening / closing device 49 that is a combination of an electric motor and a brake. The opening / closing device 49 is provided with a drive-side wheel 51 that rotates by the output of the electric motor. The outer periphery of the drive-side wheel 51 is fixed to the inside of the winding tube 47 by a rivet or the like. The brake detects when the shutter curtain 17 has reached the fully open or fully closed position by a detection sensor or the like, and stops the electric motor from rotating based on this detection signal.

[0033] On the other hand, the second support shaft 35 is the shaft portion of the spring unit 43, and this spring unit 43 is supported in a cantilever manner by a bearing 39. The spring unit 43 is configured to include an assisting side wheel 53 rotatably supported on the non-rotating second support shaft 35, and a return spring 55 which is a torsion coil spring connected to the assisting side wheel 53 and the second support shaft 35. The return spring 55 is fitted onto the outer periphery of the second support shaft 35, with one end fixed to the second support shaft 35 by an axle side fixing portion 57 and the other end fixed to the assisting side wheel 53 by a wheel side fixing portion 59. The outer periphery of the assisting side wheel 53 is fixed to the inside of the winding tube 47 by a rivet or the like.

[0034] In the structure of the opening / closing body device, the winding tube 47 is fixed at its inner periphery to the outer periphery of the driving side wheel 51 of the electric mechanism 41 and the assisting side wheel 53 of the spring unit 43 to form the outer shell of the winding section 23. The winding tube 47 has a complex cross-sectional shape with a plurality of protrusions that are engagement parts with the driving side wheel 51 and the assisting side wheel 53, and therefore is made of aluminum material for the purpose of weight reduction and formability. The winding tube 47 winds the shutter curtain 17 that opens and closes the opening 15 around its outer periphery. The winding tube 47 is formed of a long cylinder that extends almost across the width of the opening 15. In other words, the inside of the winding tube 47 is a storage space that stores the electric mechanism 41 and the spring unit 43. The approximate center of the winding tube 47 is a gap where the electric mechanism 41 and the spring unit 43 are separated. In this gap, the bending restriction part 45 covered by the winding tube 47 is arranged.

[0035] FIG. 3 is a front view showing the winding section 23, which has been prevented from falling by the bend restricting section 45 after the winding tube 47 has disappeared, together with an enlarged view of the essential parts. The electric mechanism 41 has the above-mentioned driving side wheel 51 which rotates integrally with the winding tube 47. The electric mechanism 41 has a support wheel 61 which rotates integrally with the winding tube 47 between the driving side wheel 51 and the first support shaft 31. The spring unit 43 has the above-mentioned assisting side wheel 53 which rotates integrally with the winding tube 47. Between the driving side wheel 51 and the assisting side wheel 53, there is provided a bending restriction part 45 which restricts the intersection angle between the axis of the electric mechanism 41 and the axis of the spring unit 43 to be a predetermined angle.

[0036] FIG. 4 is an exploded perspective view of a main part, showing variations of the bend restricting portion 45 (a) to (c). As shown in FIG. 4, the bend restricting portion 45 can be formed by forming a convex portion at one of the driving side shaft end portion and the assisting side shaft end portion, and forming a concave portion at the other. As shown in FIG. 4(b)(c), the concave portion is formed between at least a pair of upper and lower parallel protrusions 63. As shown in FIG. 4(b), the pair of upper and lower parallel protrusions 63 may be formed by removing a pair of notches 67 from the end of a pipe member 65. Also, as shown in FIG. 4(c), a pair of upper and lower plate members may be arranged in parallel, or a configuration in which plate members such as a letter V-shaped and a letter V-shaped are opposed to each other may be used. The convex portion is inserted into the concave portion with an engagement allowance Ks shown in FIG. 3.

[0037] In the structure of the opening / closing body device according to this embodiment, as shown in FIG. 4(a), the convex portion is an axis member 69, and the concave portion is a pipe member 65 into which the axis member 69 can be inserted. The axis member 69 and the pipe member 65 are inserted without contact. In other words, the axis member 69 and the pipe member 65 have a predetermined gap, allowing relative rotation. The gap between the axis member 69 and the pipe member 65 may be coated or filled with grease or the like. The presence of a lubricant such as grease makes it possible to suppress the generation of contact noise and the like during relative rotation.

[0038] Furthermore, in the structure of the opening / closing body device according to this embodiment, a case will be described as an example in which the driving side shaft end is the shaft member 69 and the assisting side shaft end is the pipe member 65. The shaft member 69 has a flange-shaped base portion 71 fixed to the base end of the shaft body 73. The shaft member 69 has the base portion 71 fixed to the end face of the driving side wheel 51 so that the shaft body 73 is coaxial with the driving side wheel 51. It is needless to say that the structure of the opening / closing body device may be such that the driving side shaft end is the pipe member 65 and the assisting side shaft end is the shaft member 69.

[0039] FIG. 5 is a schematic diagram of the bend restricting portion 45 that prevents the winding portion 23 from falling after the winding tube 47 disappears. In the bend restricting section 45, when the driving side wheel 51 and the assisting side wheel 53 are fixed to the winding tube 47, that is, when a solid outer shell is present, the shaft member 69 and the pipe member 65 are inserted coaxially in the horizontal direction into the winding tube 47 as shown in Fig. 2. In contrast, when the winding tube 47 is softened or lost due to heat such as a fire, the pipe member 65 and the shaft member 69 are inclined from a straight horizontal state to the inside of the pipe member 65 as shown in the enlarged view of Fig. 3, and the shaft member 69 comes into contact with the inner surface of the pipe member 65. As shown in Fig. 5, which is a schematic diagram of this state, the shaft member 69 and the pipe member 65 are hooked with a predetermined distance Ks in the axial direction, and the crossing angle θ is restricted from becoming a predetermined angle described later, so that the connected state can be maintained. Here, the overlapping distance Ks is the dimension by which they overlap in the hanging direction, which is the direction of gravity, with respect to the horizontal direction, which is the axial direction. The pipe member 65 and the shaft member 69 have an insertion / receiving structure, and this is the dimension by which they engage with each other under their own weight and do not come out.

[0040] FIG. 6 is a schematic diagram for explaining the relationship between the outer diameter Dg of the shaft member 69 and the inner diameter Dn of the pipe member 65 and the maximum intersection angle θmax. In the bend restricting portion 45, when the length of the shaft member 69 is configured with Lg1 shorter than Lg shown in Fig. 5 (Lg>Lg1) and the length of the pipe member 65 is configured with Ln1 shorter than Ln shown in Fig. 5 (Ln>Ln1), when the engagement allowance Ks becomes 0 (Ks=0), the crossing angle becomes the maximum crossing angle θmax and the connection between the shaft member 69 and the pipe member 65 is released. Note that the engagement allowance Ks becomes 0 even when either the shaft member 69 or the pipe member 65 is short.

[0041] When the engagement allowance Ks becomes 0, the bending restriction portion 45 causes the shaft member 69 and the pipe member 65 to descend due to gravity and bend as the winding portion 23. In other words, the electric mechanism portion 41 and the spring unit 43 are in a cantilever state where they do not support each other, and both ends of each of them descend in the direction of gravity, centering on the connection portion with the bearing 39. At this time, if the first support shaft 31 and the second support shaft 35 cannot withstand their own weight and are destroyed by gravity, the electric mechanism portion 41 and the spring unit 43 will fall. For this reason, in the structure of the opening / closing body device, the shaft member 69 and the pipe member 65 have lengths Lg and Ln shown in FIG. 5, are engaged with each other at a predetermined distance in the axial direction by the engagement allowance Ks (Ks>0), and bending that would cause the cross angle θ to become the maximum cross angle θmax is restricted, and the connected state is maintained.

[0042] The relationship between the maximum intersection angle θmax, the outer diameter Dg of the shaft member 69, and the inner diameter Dn of the pipe member 65 can be expressed by the following formula. That is, the shaft member 69 and the pipe member 65 are disconnected when the engagement allowance Ks = 0. At this time, it is considered that the outer periphery lower end A of the shaft member 69 is located at the inner periphery lower end of the pipe member 65, and the inner periphery upper end B of the pipe member 65 is in contact with the outer periphery of the shaft member 69. The triangle ABC on the tip side of the shaft member 69 is located inside the pipe member 65. The maximum intersection angle θmax is equal to ∠BAC (θmax = ∠BAC). Therefore, cos(θmax) = Dg / Dn holds.

[0043] In the bend control section 45 shown in FIG. 6, in order to reduce the maximum intersection angle θmax and thereby prevent the shaft member 69 from dropping, it is understood that at least one of the length Lg1 of the shaft member 69 and the length Ln1 of the pipe member 65 should be increased, or the outer diameter Dg should be increased, or the inner diameter Dn should be decreased.

[0044] Next, the operation of the above-mentioned configuration will be described.

[0045] In the structure of the opening / closing body device according to this embodiment, the first support shaft 31 is fixed to the first opposing surface 29 on one side of the opening 15 in the width direction, and the second support shaft 35 is fixed to the second opposing surface 33 on the other side. The first support shaft 31 is supported as a cantilever as an electric mechanism 41. The second support shaft 35 is supported as a cantilever as a spring unit 43. The electric mechanism 41 and the spring unit 43 are fixed coaxially to the inside of an aluminum winding tube 47. In other words, the electric mechanism 41 and the spring unit 43, which are each supported as a cantilever, are fixed to the inside of the winding tube 47 to form an integrated uniaxial unit, and both ends are supported. The shutter curtain 17 is wound around the outer periphery of the winding tube 47.

[0046] The electric mechanism 41 has a coaxial driving side wheel 51 that rotates and drives the winding tube 47. The outer periphery of the driving side wheel 51 of the electric mechanism 41 is fixed to the inner periphery of the winding tube 47. The spring unit 43 has a coaxial assisting side wheel 53 that rotates together with the winding tube 47 to transmit the accumulated assisting force to the winding tube 47. The outer periphery of the assisting side wheel 53 of the spring unit 43 is fixed to the inner periphery of the winding tube 47.

[0047] The driving side wheel 51 and the assisting side wheel 53 are separated from each other at the approximate center of the winding tube 47 in the direction along the axis line. That is, the driving side wheel 51 and the assisting side wheel 53 are not in contact with each other and are connected only through the winding tube 47 which constitutes the outer shell. Therefore, when the winding tube 47 is softened and melted by high heat such as a fire, the electric mechanism 41 and the spring unit 43 are no longer an integrated uniaxial unit and each has a cantilever support structure. During this softening and melting process, stress is concentrated in the approximate center of the winding tube 47 due to the cantilever support from both ends and the separation, causing the winding tube 47 to buckle and bend. In the worst case, the electric mechanism 41 and the spring unit 43 may fall together with the softened winding tube 47 due to their own weight.

[0048] In the structure of the opening / closing body device, even if stress is concentrated near the center of the winding tube 47 during the softening and melting process, causing the winding tube 47 to buckle or melt and disappear, a bending control section 45 is provided to control the intersection angle between the axis of the electric mechanism section 41 and the axis of the spring unit 43 to be a specified angle.

[0049] Here, the predetermined crossing angle can be called the maximum crossing angle θmax. The maximum crossing angle θmax is the bending angle when the engagement allowance Ks becomes zero. The bending restriction unit 45 restricts the crossing angle between the axis of the electric mechanism unit 41 and the axis of the spring unit 43 to be a predetermined angle, so that the electric mechanism unit 41 and the spring unit 43 can be maintained as if they were an integrated uniaxial unit, regardless of the presence or absence of the winding tube 47. As a result, in the structure of the opening / closing body device, when the winding tube 47 is softened, melted, or lost due to heat such as a fire, the winding unit 23 is prevented from falling, thereby improving the fireproof performance of the shutter device 11.

[0050] In addition, in the structure of this opening / closing body device, the bend restriction portion 45 has a drive-side shaft end portion and an assistant-side shaft end portion which are inserted coaxially in the horizontal direction. The drive-side shaft end portion is fixed integrally with the drive-side wheel 51 and rotates integrally with the drive-side wheel 51. On the other hand, the assistant-side shaft end portion passes coaxially through the assistant-side wheel 53 and becomes non-rotating integrally with the second support shaft 35. The assistant-side shaft end portion may be on the extended end side of the extended second support shaft 35.

[0051] The drive-side shaft end and the assistant-side shaft end are in an insertion / receiving structure. The drive-side shaft end and the assistant-side shaft end are hooked with a predetermined axial length Ks by this insertion / receiving structure. It is preferable that this insertion / receiving structure is non-contact. In other words, the bend restricting portion 45 is structured to permit rotation of the drive-side shaft end while restricting bending so that the assistant-side shaft end is a fixed shaft and the drive-side shaft end and the assistant-side shaft end do not form the maximum crossing angle θmax. Note that the drive-side shaft end and the assistant-side shaft end may be configured so that, for example, one is fixed to the inner ring of a bearing and the other is fixed to the outer ring, so that the rotating shaft and the fixed shaft are coaxially connected. As a result, the drive side shaft end and the assistant side shaft end are caught by the bend control section 45 with a predetermined axial distance of engagement Ks, and bending to a predetermined cross angle is controlled, so that the drive side shaft end and the assistant side shaft end are maintained in a connected state, thereby preventing the winding section 23 from falling.

[0052] In the structure of this opening / closing body device, one of the driving side shaft end and the assisting side shaft end is a convex portion and the other is a concave portion. The concave portion is formed between at least a pair of upper and lower parallel protrusions 63. The convex portion is inserted into the concave portion with the above-mentioned engagement allowance Ks. The concave portion is composed of at least a pair of upper and lower parallel protrusions 63, and by inserting the convex portion therebetween with the engagement allowance Ks, it becomes possible to sandwich the convex portion from above and below when the mutual axes intersect. In other words, the bend restricting portion 45 restricts bending so that the axes of the driving side shaft end and the assisting side shaft end do not form a predetermined intersecting angle by inserting the convex portion and the concave portion with the engagement allowance Ks. As a result, the drive side shaft end and the assistant side shaft end are convex and concave portions, and a concave portion is formed between at least a pair of upper and lower parallel protrusions 63, and the convex portion is inserted into the concave portion with an engagement allowance Ks, so that the convex portion can be clamped from above and below by the pair of upper and lower parallel protrusions 63, and the axes of the drive side shaft end and the assistant side shaft end can be regulated to form a predetermined intersecting angle.

[0053] Furthermore, in the structure of this opening / closing body device, the convex portion is the shaft member 69, and the concave portion is the pipe member 65. The shaft member 69 and the pipe member 65 can be inserted and received by setting the outer diameter of the shaft member 69 to be smaller than the inner diameter of the pipe member 65. The shaft member 69 and the pipe member 65 are inserted with the engagement allowance Ks, so that the axis lines of both are restricted to a predetermined crossing angle (i.e., the maximum crossing angle θmax). The crossing angle θ in this case varies depending on the gap, which is the inner / outer diameter difference between the outer diameter of the shaft member 69 and the inner diameter of the pipe member 65, and the engagement allowance Ks. That is, the crossing angle θ is in a proportional relationship such that it is smaller when the inner / outer diameter difference (gap) is small, and is larger when the inner / outer diameter difference (gap) is large. Also, the crossing angle θ is in an inversely proportional relationship such that it is larger when the engagement allowance Ks is small, and is smaller when the engagement allowance Ks is large.

[0054] There is a correlation between the inner and outer diameter difference and the engagement allowance Ks. Even if the inner and outer diameter difference is small, if the engagement allowance Ks is small, the crossing angle may not be regulated. On the other hand, even if the inner and outer diameter difference is large, the crossing angle may be regulated if the engagement allowance Ks is large.

[0055] In the insertion and receiving structure in which the shaft member 69 is inserted with a predetermined gap between the inner and outer diameters, the crossing angle θ increases as the engagement allowance Ks decreases, and when the crossing angle θ reaches the maximum crossing angle θmax, the pipe member 65 releases the vertical clamping, and the shaft member 69 and the pipe member 65 are released from the vertical clamping. In this specification, the predetermined crossing angle is referred to as the maximum crossing angle θmax. In other words, the bending restriction portion 45 is configured to restrict the shaft member 69 and the pipe member 65 from bending at the maximum crossing angle θmax. As a result, since the recessed portion is the pipe member 65 and the protruding portion is the shaft member 69, by inserting the shaft member 69 into the pipe member 65, the shaft member 69 can be firmly clamped from the vertical direction with a simple structure, and the axis of the drive-side shaft end and the assist-side shaft end can be restricted from reaching the maximum crossing angle θmax.

[0056] Furthermore, in the structure of this opening / closing body device, the drive side shaft end is the shaft member 69, and the assisting side shaft end is the pipe member 65. As a result, the shaft member 69 is fixed integrally to the drive side wheel 51 and rotates integrally therewith. Meanwhile, the pipe member 65 coaxially passes through the assisting side wheel 53 and is non-rotating integrally with the second support shaft 35. Therefore, in the structure of the opening / closing body device, the rotating shaft member 69 fixed coaxially with the drive side wheel 51 is inserted into the end of the pipe member 65 coaxially passing through the spring unit 43. The insertion distance of the shaft member 69 into the pipe member 65 is the engagement allowance Ks.

[0057] The bending restriction section 45 consisting of the shaft member 69 and the pipe member 65 is inserted with an engagement allowance Ks that does not result in the maximum crossing angle θmax, so that the shaft member 69 and the pipe member 65 do not come off. That is, the electric mechanism section 41 and the spring unit 43 form the maximum crossing angle θmax approximately at the center of the winding section 23, and are supported by a cantilever to restrict falling. As a result, it is possible to use the existing pipe structure provided in the spring unit 43 as the pipe member 65, and the number of additional parts can be reduced, making it possible to easily and inexpensively improve the fireproofing performance of the opening / closing body device.

[0058] Therefore, according to the structure of the opening / closing body device of this embodiment, a bend control section 45 is provided between the drive side wheel 51 and the assisting side wheel 53 to control the intersection angle θ between the axis of the electric mechanism section 41 and the axis of the spring unit 43 to be a predetermined angle.Therefore, when the winding tube 47 softens, melts, or disappears due to a fire or the like, the drive section and assisting section, which are the winding section 23, are prevented from falling, thereby improving the fire resistance of the shutter device 11. [Explanation of symbols]

[0059] 11...Opening and closing device (shutter device) 15…Opening 17...Opening and closing body (shutter curtain) 29…First opposing surface 31...1st spindle 33…Second opposing surface 35…Second spindle 41...Drive unit (electric mechanism unit) 43...Assisting part (spring unit) 45…Bending restriction section 47…Winding cylinder 51…Drive wheel 53…Assistant wheel 63...Protrusion 65...Concave portion (pipe component) 65...Supporting side shaft end (pipe member) 69...Convex portion (shaft member) 69...Drive side shaft end (shaft member) Ks…Coupling fee θ…intersection angle θmax: Intersection angle of a specified angle (maximum intersection angle)

Claims

1. A structure of an opening / closing body device comprising: a first support shaft fixed to a first opposing surface on one side of an opening in a width direction; a second support shaft fixed to a second opposing surface on the other side; a drive section supported by a cantilever so as to be coaxially rotatable on the first support shaft; an assist section supported by a cantilever so as to be coaxially rotatable on the second support shaft; and a winding cylinder which winds an opening / closing body around an outer periphery thereof, the opening / closing body having the drive section and the assist section fixed coaxially to the inside, the drive unit has a drive-side wheel that rotates integrally with the winding cylinder, The assisting portion has an assisting side wheel that rotates integrally with the winding cylinder, A structure of an opening and closing body device, characterized in that a bend control section is provided between the drive side wheel and the assist side wheel to control the intersection angle between the axis of the drive section and the axis of the assist section to be a predetermined angle.

2. the bend restriction portion has a drive-side shaft end portion and an assist-side shaft end portion which are inserted coaxially in a horizontal direction, The structure of the opening and closing body device described in claim 1, characterized in that the drive side shaft end and the assist side shaft end are engaged with each other with a predetermined distance in the axial direction, and the crossing angle is regulated to be the predetermined angle and maintained in a connected state.

3. one of the drive-side shaft end portion and the assist-side shaft end portion is a convex portion and the other is a concave portion, The recess is formed between at least a pair of upper and lower parallel protrusions, The opening / closing body structure according to claim 2 , wherein the protrusion is inserted into the recess at the engagement margin.

4. The protruding portion is a shaft member, 4. The opening / closing body device structure according to claim 3, wherein the recess is a pipe member that allows an axis member to be inserted therein.

5. the drive-side shaft end portion is the shaft member, 5. The opening / closing body device structure according to claim 4, wherein the auxiliary side shaft end portion is the pipe member.

6. 6. The opening / closing body structure according to claim 4, wherein the shaft member and the pipe member are inserted at the engagement allowance with a predetermined gap therebetween.

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