Overhead door device and method for assembling a winding shaft in an overhead door device

Abstract

To provide an overhead door device 1 which is moved between, an open posture in which, a door curtain 5 is directed to a lateral side along a ceiling part and opens an opening, and a closed posture in which the door curtain is directed to a vertical side along the opening and closes the opening, in which a winding body 12 to which a wire 14 is wound, is not disturbed by a second guide rail 9 and in the state, the winding shaft 10 is installed on a bracket 11 on a skeleton side.SOLUTION: A first collar 16 provided between a winding body 12 and a bearing part 13 is detached from a winding shaft 10, for moving the winding body 12 inside of a lateral direction, so that, the winding shaft can be installed in a state in which the winding body is not disturbed by the second guide rail 9.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to the technical field of an overhead door device provided for opening and closing openings such as the box-type loading platform of a truck or the entrance and exit of a building, and a method of incorporating a winding shaft in the overhead door device. [Background technology]

[0002] Generally, overhead door devices are known for opening and closing openings such as the box-shaped cargo bed of a truck that is enclosed in a box shape, the entrance and exit of a building, etc., in which adjacent panel bodies are connected in a series from top to bottom, and a door curtain is provided with running rollers on both left and right end edges, and the running rollers are guided by guide rails to move between a horizontal open position (storage position) in which the door curtain is stored in the ceiling, and a vertical closed position that fits along the opening. In this type of overhead door device, both left and right end edges of the winding shaft, to which a winding body is attached for winding a string-like body whose one end is connected to the left and right lower ends of the door curtain, are configured to be rotatably supported on a bracket that serves as a body side member arranged at the corner between the opening and the ceiling (above the opening).In this case, the winding shaft and the bracket are connected via a bearing part, and a balancing spring mechanism is provided, one end of which is attached to the bracket and the other end of which is attached to the winding shaft, and which stores energy in conjunction with the closing operation of the door curtain.By configuring in this way, the stored force of the balancing spring mechanism is balanced with the weight of the door curtain which has moved toward the closed position, allowing the door curtain to be opened and closed smoothly. In this case, it is known to attach the winding body to both left and right end edges of the winding shaft, adjacent to each other, on the outside and the bearing portion on the inside, and to support the winding shaft in this state by attaching it to a bracket (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-278295 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an overhead door device configured in this manner, the winding shaft is attached to the bracket in a state where it is positioned above and near the guide rail that guides the door curtain, at the corner between the ceiling and the opening.As a result, when attempting to attach the winding shaft to the bracket in a horizontal position, the guide rail gets in the way and makes it impossible to attach it. Therefore, the winding shaft is placed in an inclined position with one end edge close to the bracket on that side, and the adjacent one end edge is then assembled into the bracket on one end side, and the winding shaft is then returned to a horizontal position while the other end edge is assembled into the bracket on that side.In order to prevent the guide rail from getting in the way even when performing this assembly operation, it is necessary to lower the guide rail at the corner portion relative to the winding shaft.However, lowering the guide rail at the corner portion results in problems such as a low opening height at the opening, and these are the issues that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention has been made in view of the above-mentioned circumstances and with the objective of solving these problems. The invention of claim 1 comprises a door curtain that can be bent in the front-rear direction and has a plurality of running rollers provided at both left and right end edges with a vertical gap therebetween; a guide rail that guides the door curtain into an open position in which the running rollers run horizontally along the ceiling to open an opening, and into a closed position in which the running rollers run vertically along the opening to close the opening; a winding body that winds up a string-like body having one end connected to the left and right lower end portions of the door curtain; a winding shaft that is attached to both left and right end edges of the winding body; and a structure that is arranged with a gap on the inside of the left and right direction from the winding body. This overhead door device is comprised of a bearing section that is attached to a bracket on the side so that it abuts from the outside in the left-right direction, and a balance spring mechanism that has one end attached to the bracket and the other end attached to the winding shaft and that stores energy in conjunction with the movement of the door curtain toward the closed position.In this overhead door device, a collar is attached to the gap between the winding body and the bearing section to restrict movement of the winding body toward each other, and the collar is removably attached to the winding shaft so that the winding body can be allowed to move inward in the left-right direction relative to the winding shaft by removing the collar. The invention of claim 2 is an overhead door device as described in claim 1, characterized in that the collar is divided into multiple collar parts in the left and right direction, and at least one of the divided collar parts is removably attached to the winding shaft. The invention of claim 3 is an overhead door device as described in claim 2, characterized in that the collar is divided into two parts, and the collar part on the winding body side of the two divided collar parts is removably attached to the winding shaft. The invention of claim 4 is an overhead door curtain comprising: a door curtain that can be bent in the front-rear direction and has a plurality of running rollers at both left and right end edges with a vertical gap; a guide rail that guides the door curtain to an open position where the door curtain turns horizontally along the ceiling to open the opening and a closed position where the door curtain turns vertically along the opening as the running rollers run; a winding body that winds a string-like body having one end connected to the lower left and right end edges of the door curtain; a winding shaft that is attached to both left and right end edges of the winding body; a bearing part that is arranged on the inside in the left-right direction with a gap from the winding body and is attached to a bracket on the main body side in a state of abutting from the outside in the left-right direction; and a balance spring mechanism that has one end attached to the bracket and the other end attached to the winding shaft and is energized in conjunction with the movement of the door curtain to the closed position. This is a method for assembling a winding shaft in a door device so that it is supported by left and right brackets, the method comprising the steps of sequentially carrying out the steps of: removing a collar that is detachably attached in the gap between the winding body and a bearing portion and moving the winding body at one end in the left-right direction inward in the left-right direction; assembling one end of the winding shaft into the bracket on that side in an inclined state where the one end is close to the bracket on that side; assembling the other end of the winding shaft into the bracket on that side in a state where the inclined state is corrected; moving the winding shaft to the other end side to position it at an attachment position and moving the moved winding body to an attachment position; and attaching the removed collar and the winding body moved to the attachment position to the winding shaft. The invention of claim 5 is a method for assembling a winding shaft in an overhead door device as described in claim 4, characterized in that the collars are removably attached in the gaps between the winding bodies and the bearing portions on both the left and right sides, and the method includes sequentially carrying out the steps of removing the collar on the other end side of the winding shaft before assembling one end side of the winding shaft into the bracket, moving the bearing portion on the other end side outward in the left-right direction to the other end side before assembling the other end side of the winding shaft into the bracket, and attaching the collar on the other end side to the winding shaft after moving the bearing portion on the other end side that has been moved to an attachment position. Effect of the Invention

[0006] By adopting the invention of claim 1 or 4, when assembling the winding shaft to which the winding body and bearing part are attached into the bracket, the anti-movement collar attached in the gap between the winding body and the bearing part is removed and the winding body is moved inward in the left-right direction, so that the winding body is moved inward relative to the end edge of the winding shaft and assembled into the bracket.As a result, the guide rail arranged near the winding body can be avoided from being positioned at a low level, which not only facilitates the assembly work but also enables the opening height at the opening to be increased. By adopting the inventions of claims 2 and 3, the collar that is attached to and detached from the winding shaft can be an existing one, and the remaining collars can be constructed simply as cylindrical ones, making the device highly versatile. According to the invention as defined in claim 5, when the winding shaft is assembled, if the other end side is obstructed by the guide rail, this can be dealt with by moving the bearing portion. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. 2 is a side cross-sectional view of the overhead door device. [Diagram 3]FIG. 2 is a rear view of the overhead door device. [Figure 4] 1A and 1B are an enlarged side view and a horizontal cross-sectional view of a guide rail portion of an overhead door device. [Diagram 5] FIG. [Figure 6] 1A, 1B, 1C, and 1D are a rear view, a side view, a longitudinal sectional view, and a rear view of a main part of a door curtain. [Figure 7] FIG. [Figure 8] FIG. 4 is a partial cross-sectional view of a winding body portion of the winding shaft. [Figure 9] 1A, 1B, and 1C are a side view, a front view, and a side view showing an exploded state of a second collar. [Figure 10] 13(A), (B), and (C) are explanatory views showing the first half of the process of attaching the winding shaft to the bracket. [Figure 11] 13(A) and (B) are explanatory views showing the middle process of attaching the winding shaft to the bracket. [Figure 12] 13(A) and (B) are explanatory views showing the latter half of the process of attaching the winding shaft to the bracket. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an overhead door device for opening and closing an opening E provided at the rear of a box-shaped loading platform 3 of a truck 2, which is a luggage transport vehicle. The box-shaped loading platform 3 has a ceiling surface portion 3a, left and right side portions 3b, and a front portion (not shown), and the rear portion serves as the opening E for loading and unloading luggage. In this case, left and right vertical frames 4 that are L-shaped in plan view and serve as body side members are provided at the left and right rear end edges of the loading platform 3. The left and right side frame portions 4a of the left and right vertical frames 4 are connected to the left and right side portions 3b, and the width between the left and right rear frame portions 4b defines the width of the opening E. On the other hand, the door curtain 5 constituting the overhead door device 1 is constructed by connecting a number of adjacent panel bodies 5a in the vertical direction via support shafts 5b so that they can swing freely, and a number of running rollers 6, 6a are provided at both left and right end edges with gaps in the vertical direction. Incidentally, the uppermost running roller 6a is attached to the uppermost panel body 5a via a bracket 6b, while the other running rollers 6 are attached to the support shaft 5b.

[0009] An attachment plate 7 having an L-shape in a plan view is provided on the inner surfaces of the left and right vertical frames 4. A side panel portion 7a of the attachment plate 7 is attached to each of a first guide rail 8 along which the running rollers 6, 6a, except for the uppermost running roller 6a, run and guide, and a second guide rail 9 along which the uppermost running roller 6a runs. Specifically, the first guide rail 8 is configured to be a series of an opening rail portion 8a oriented vertically along the opening E, a ceiling rail portion 8b oriented horizontally along the ceiling surface portion 3a, and a curved connecting rail portion 8c that connects the opening rail portion 8a and the ceiling rail portion 8b at the corner portion C between the ceiling surface portion 3a and the opening E, with the opening E side portions of the opening rail portion 8a and the connecting rail portion 8c being attached to the side plate portion 7a of the mounting plate 7, and the remaining connecting rail portion 8c and ceiling rail portion 8b being attached to the left and right side surface portions 3b.

[0010] In contrast, the second guide rail portion 9 is arranged adjacent to the upper side of the first guide rail 8 and is composed of an opening side rail portion 9a arranged above the connecting rail portion 8c and a rear side rail portion 9b arranged parallel to the upper side of the ceiling rail portion 8b, with the opening E side end of the opening side rail portion 9a attached to the side panel portion 7a, and the remaining portions of the second guide rail 9 attached to the left and right side portions 3b. The door curtain 5 is configured so that the running rollers 6 are guided along the first guide rail 8 and the uppermost running roller 6a is guided along the second guide rail 9, so that the door curtain 5 can be opened and closed between a horizontal open position (storage position) stored in the ceiling surface portion 3a and a vertical closed position along the opening E.

[0011] Reference numeral 10 denotes a winding shaft, which is rotatably supported by a bracket 11 attached to the upper end of the mounting plate 7. The bracket 11 is L-shaped in a plan view and comprises a mounting plate portion 11a attached to the upper end of the mounting plate rear panel portion 7b, and a support plate portion 11b bent forward from the inner left-right edge of the mounting plate portion 11a. The support plate portion 11b is configured to have a left-right gap with respect to the mounting plate side panel portion 7a (the inner surfaces of the left and right side frame portions 4a of the left and right vertical frames 7) so as to form a storage space (gap, space) S. A support groove 11c for fitting the winding shaft 10 is formed in the support plate portion 11b, which is inclined downward and forward.

[0012] The left and right end edges of the winding shaft 10 are rotatably fitted into the support grooves 11c provided in the bracket support plate portion 11b, and the left and right end edges of the winding shaft 10 are fitted with a winding body (winding drum) 12 on the outside in the left-right direction and a bearing portion 13 on the inside in a state of being stored in the storage space S between the bracket support plate portion 11b and the mounting plate side plate portion 7a, and the winding body 12 is fitted around the winding shaft 10 so as to be rotatable and movable left and right, and is integrated with the winding shaft 10 by fastening it with a bolt 12b provided in the support portion 12a. The winding body 12 is configured so that a wire (corresponding to the "string-like body" of the present invention) 14, one end of which is connected to the lowest end portion of the door curtain 5, is wound around it.

[0013] In contrast, the bearing portion 13 has an inner portion 13a fitted onto the winding shaft 10 so as to be freely rotatable and movable left and right, while an outer portion 13c which is configured to be freely rotatable relative to the inner portion 13a via a ball 13b is integrated with the bracket support plate portion 11b by fastening a flange portion 13d provided on the outer portion 13c to the bracket support plate portion 11b via a bolt 13e. Furthermore, a balance spring machine 15 constructed using a coil spring machine is loosely fitted onto the inside of the left-right direction of the winding shaft 10. One end 15a of the balance spring machine 15 is integrally attached to the bracket support plate portion 11b on that end side (the right side in the drawing) together with the outer portion 13c via the bolt 13e, and the other end 15b is integrally attached to the winding shaft 10 via the bolt 15c.

[0014] When the door curtain 5 is in the open position, the wire 14 is in a maximum winding state around the winding body 12, while the balance spring 15 is in a minimum energy storage state. When the door curtain 5 is moved from the open position to the closed position, the wire 14 is pulled downward in conjunction with the movement to the closed side, and the winding body 12 rotates together with the winding shaft 10 to unwind the wire 14, while the balance spring 15 rotates together with the winding shaft 10 with one end 15a fixed to the bracket 11 on the body side and immovable, thereby storing energy. The stored energy is set to be balanced with the weight of the portion of the door curtain 5 that has reached the first guide rail opening rail portion 8a, thereby allowing the door curtain 5 to be opened and closed smoothly. Incidentally, the upper edge of the opening E has an upper frame portion 3c that hangs down from the rear edge of the ceiling surface portion 3a, and this upper frame portion 3c hangs down slightly lower than the rear edge of the opening side rail portion 9a of the second guide rail 9 and forms the upper surface (top surface) of the opening E.

[0015] In the overhead door device 1 configured in this manner, as described above, the winding body 12 and the bearing portion 13 arranged in the storage space S are attached with a gap in the left-right direction, and a collar is fitted into the gap so that the winding body 12 and the bearing portion 13 are attached in a positioned state. In this embodiment, the collar is divided into two, a first collar 16 on the winding body 12 side and a second collar 17 on the bearing portion 13 side. In this case, the first collar 16 is arranged with its outer left-right edge abutting the inner edge of the winding body support portion 12a, and the first collar 16 has a pair of collar halves 16a, 16b divided radially into two, and is configured to be attached and detached to the winding shaft 10 by means of a bolt 16c screwed from one collar half 16a to the other collar half 16b. In contrast, the second collar 17 is composed of a cylindrical body that fits around the winding shaft 10, and unlike the first collar 16, it cannot be attached or detached from the winding shaft 10. However, its outer edge in the left-right direction abuts against the first collar 16, and its inner edge abuts against the inner portion 13a of the bearing portion 13.

[0016] In this manner, the left and right ends of the winding shaft 10, with the winding body 12, bearing portion 13, balance spring 15, and first and second collars 16, 17 attached, are assembled to the left and right brackets 11. In this case, however, the first and second guide rails 8, 9 (especially the second guide rail 9) are arranged at the corner portion C where the bracket 11 is attached, which gets in the way of attaching the winding shaft 10. In this embodiment, the winding shaft 10 is assembled into the bracket 11 in the following manner.

[0017] First, when the winding shaft 10 is transported to the installation site of the overhead door device 1, as shown in Figure 10 (A), the winding body 12, bearing portion 13, balance spring 15, and first and second collars 16, 17 are fitted onto the winding shaft 10. In this case, the bearing portion 13, balance spring 15, and first and second collars 16, 17 are fitted onto the winding shaft 10, and the winding body 12 is fixed to the winding shaft 10 via bolt 12b, so that the parts such as the bearing portion fitted onto the winding shaft 10 are prevented from coming loose. When the product is brought to the site in this state, as shown in Figure 10 (B), for the left and right first collars 16, the bolts 16c are removed and the product is removed from the winding shaft 10 to form a gap between the winding body 12 and the bearing portion 13, and the bolt 12b for the winding body 12 on one end side is also removed (or loosened) to allow the winding body 12 on that side to be freely moved in the left and right directions. 10(C), the winding body 12 on one end side is moved inward in the left-right direction so as to approach the bearing portion 13, while the bearing portion 13 on the other end side is moved outward in the left-right direction so as to approach the winding body 12 on that side. In this manner, preparations for attaching the winding shaft 10 to the bracket 11 are completed.

[0018] Next, the winding shaft 10 thus prepared is to be assembled to the bracket 11. To do this, as shown in FIG. 11(A), one end of the winding shaft 10 is brought close to the bearing portion 13 and close to the bracket 11 on that side, and the other end is in an inclined position away from the bracket 11 on that side. Then, the other end of the winding shaft 10 is fitted into the support groove 11c provided in the bracket support plate portion 11b on that side. At this time, the winding shaft 12 on one end side is moved inward in the left-right direction relative to the winding shaft 10. Therefore, when the winding shaft 10 is moved outward on one end side so that one end edge 10a abuts (or is close to) the mounting plate side panel portion 7a in order to be assembled into the bracket support plate portion 11b, the winding body 12 in the inwardly moved state is biased inward in the left-right direction relative to the second guide rail 9 and is not obstructed (does not interfere), so that the winding shaft 10 can be assembled into the bracket support plate portion 11b with the flange portion 13d of the bearing portion 13 on that side abutting the outer left-right surface of the bracket support plate portion 11b.

[0019] 11(B), the other end of the winding shaft 10 is brought close to the bracket 11 on that side so that the inclined posture is corrected and the other end of the winding shaft 10 is fitted into the support groove 11c of the bracket support plate 11b on that side, and assembled, and at this time, the flange portion 13d of the bearing portion 13 in the state of being moved outward in the left-right direction is assembled in a state of abutting from the outside in the left-right direction against the bracket support plate 11b on that side. At this time, the winding body 12 on the other end side is in an unobstructed state biased inward in the left-right direction with respect to the second guide rail 9 on that side by moving the winding shaft 10 so that one end edge 10a abuts (or is close to) the mounting plate side plate portion 7a on that side as described above, and thus the winding shaft 10 can be assembled into the bracket support plate 11b with the flange portion 13d of the bearing portion 13 at the other end abutting the outer surface in the left-right direction of the bracket support plate 11b.

[0020] 12(A), the winding shaft 10 is moved to the other end side to the mounting position relative to the bracket 11, and the left and right bearing parts 13 are attached to the bracket 11 via the bolts 13e with the bearing parts 13 abutting against the bracket support plate parts 11b. In this case, when the bearing parts 13 on one end side are attached to the bracket 11 via the bolts 13e, one end 15a of the balance spring 15 is fastened together with the bracket 11, and the other end 15b of the balance spring 15 is attached to the winding shaft 10 via the bolts 15c. In this process, the winding body 12 on one end side is further moved to the mounting position relative to the winding shaft 10. Thereafter, as shown in FIG. 12(B), the removed first collar 16 is attached to the winding shaft 10 via bolt 16c, and the winding body 12 at one end side that has been moved to the attachment position is attached to the winding shaft 10 via bolt 12b. In this manner, the winding body 10 can be assembled into the bracket 11.

[0021] In the present embodiment configured as described above, in the overhead door device 1 in which the door curtain 5 is guided by the first and second guide rails 8, 9 to open and close the opening E, the winding body 12 which winds the wire 14 and has one end edge connected to the lower left and right end parts of the door curtain 5, and the winding shaft 10 which has bearing parts 13 attached to both left and right end parts to allow free rotation relative to the bracket 11 side are assembled into the bracket 11 arranged at the corner part C between the rear end part of the ceiling surface part 3a and the upper end part of the opening E. Of the first and second collars 16, 17 provided between the winding body 12 on one left-right end side and the bearing part 13, the first collar 16 which has become a split type is removed from the winding shaft 10, and the winding body 12 on one end side is moved inward in the left-right direction by removing the bolt 12b, so that the moved winding body 12 is positioned inside one end edge 10a of the winding shaft 10 and avoids the second guide rail 9. As a result, when one end of the winding shaft 10 is assembled into the bracket 11, the winding shaft 10 can be assembled into the bracket 11 with one end thereof in an inclined position close to the bracket 11 on that side, and with one end edge 10a shifted outward in the left-right direction so as to abut (be close to) the side panel portion 7a of the mounting plate.

[0022] Then, the other end of the winding shaft 10, one end of which is thus mounted in the bracket 11, is mounted in the bracket 11 on that side. In this case, since the winding shaft 10 has been moved toward one end in the left-right direction, the winding body 12 on the other end side has been moved toward one end in the left-right direction, that is, it is separated from the side panel portion 7a of the mounting plate on the other end side and is therefore separated from the second guide rail 9 provided on the side panel portion 7a and is not obstructed. In this state, the first collar 16 on the other end side is removed from the winding shaft 10 and the bearing portion 13 on that side is moved outward in the left-right direction and left in close proximity to the winding body 12, so that when one end edge 10a of the winding shaft 10 has moved to one side in the left-right direction, the flange portion 13d of the bearing portion 13 is positioned outside the bracket support plate portion 11b in the left-right direction. In this state, the winding shaft 10 in the inclined position is moved so that the other end portion is placed in a horizontal position close to the bracket 11 on that side, and the winding shaft 10 is assembled with the flange portion 13d abutting the bracket support plate portion 11b from the outside in the left-right direction.

[0023] Thereafter, the winding shaft 10, which has moved to one end in the left-right direction, is moved to the other end in the left-right direction and positioned in the correct mounting position. At one end, the flange portion 13d, bracket support plate portion 11b and one end 15a of the balance spring 15 are attached via bolt 13e, and the other end 15b of the balance spring is attached to the winding shaft 10 via bolt 15c. The winding body 12 is then moved to the mounting position relative to the winding shaft 10, while at the other end, the flange portion 13b is attached to the bracket support plate portion 11b via bolt 13e. Thereafter, the first collar 16 that was removed is assembled onto the winding shaft 10 and attached via bolt 16c, and the winding body 12 on one end side is attached to the winding shaft 10 via bolt 12b, thereby enabling the winding shaft 10 to be assembled to the corner portion C.

[0024] In this manner, when the present invention is implemented, when the winding shaft 10 to which the winding body 12 and the bearing portion 13 are attached is assembled to the bracket 11, which is a body side member, the second guide rail 9 abuts (interferes with) the winding body 12 and interferes with the assembly. This can be prevented by removing the first collar 16 from the winding shaft 10 and moving the winding body 12 inward in the left-right direction. As a result, not only is the assembly work of the winding shaft 10 into the bracket 11 made easier, but there is also no longer a need to position the second guide rail 9 at a low position so as not to interfere with the assembly, and the opening height of the opening E can be increased.

[0025] Furthermore, in this case, when the other end of the winding shaft 10 is assembled into the bracket 11, in this embodiment the bearing portion 13 is moved outward in the left-right direction when the winding shaft 10 is assembled into the bracket 11. However, if this is not necessary, for example, if the second guide rail 9 gets in the way at one end, but the second guide rail 9 does not get in the way of the winding body 12 when the winding shaft 10 that has been moved to the one end side is moved to the other end side while being assembled by correcting the inclined posture, then it goes without saying that there is no need to remove the first collar 16 on that side and move the bearing portion 13 to the other end side.

[0026] In this way, when the second guide rail 9 does not get in the way at the other end side, the winding shaft 10 can be assembled to the bracket 11 as follows: a step of removing the first collar 16 detachably attached in the gap between the winding body 12 and the bearing portion 13, and moving the winding body 12 at one end in the left-right direction inward in the left-right direction; A step of fitting one end of the winding shaft 10 to the bracket 11 on that side in an inclined state in which the one end is close to the bracket 11 on that side; a step of fitting the other end of the winding shaft 10 into the bracket 11 on that side in a state where the tilted state is corrected; a step of moving the winding shaft 10 to the other end side to position it at an attachment position, and moving the wound body 12 at the one end side that has been moved to the attachment position; a step of attaching the removed first collar 16 and the one end side winding body 12 to the winding shaft 10; The method includes sequentially executing the above steps. By mounting the winding shaft 10 in this manner, the winding shaft 10 can be easily assembled in a case where the second guide rail 9 does not get in the way.

[0027] On the other hand, the second guide rail 9 may also get in the way at the other end of the winding shaft 10. In this case, A step of removing the second collar 16 on the other end side before a step of fitting one end side of the winding shaft 10 into the bracket 11; a step of moving the bearing portion 13 on the other end side of the winding shaft 10 outward in the left-right direction toward the other end side before the step of fitting the other end side of the winding shaft 10 into the bracket 11; a step of moving the bearing portion 13 on the other end side to an attachment position, and then attaching the first collar 16 on the other end side to the winding shaft; By configuring in this manner, the winding shaft 10 can be easily assembled even when the other end side is obstructed by the second guide rail 9.

[0028] Of course, the present invention is not limited to the above-described embodiment, and the first and second collars 16, 17 may be integrated together, in which case it goes without saying that the entire integrated collar is removable. In an embodiment in which the collars are split into first and second collars 16, 17, the first collar 16, which is detachable, can be a commercially available general-purpose collar, and the second collar 17, which is not detachable, can be a cylinder cut to the required dimensions. As a result, a collar corresponding to the installation dimensions can be easily made to correspond to the required dimensions using a general-purpose collar. [Industrial Applicability]

[0029] INDUSTRIAL APPLICABILITY The present invention can be utilized as an overhead door device and a method for incorporating a winding shaft, which are provided for opening and closing openings such as the box-type loading platform of a truck or the entrance and exit of a building. [Explanation of symbols]

[0030] 1. Overhead door device 5 Door Curtain 6, 6a Traveling roller 9 Second guide rail 10 Winding shaft 10a One edge 11 Bracket 11b Support plate part 12 Winding body 12b Bolt 13 Bearing 13e Bolt 14 Wire 15 Balance spring machine 16 First Color 16c bolt 17 Second Color C Corner E Opening

Claims

1. A door curtain that is bendable in the front-rear direction and has a plurality of running rollers at both left and right end edges with a vertical gap therebetween; A guide rail that guides the door curtain to an open position in which the door curtain is oriented horizontally along the ceiling portion to open the opening portion by the running rollers, and a closed position in which the door curtain is oriented vertically along the opening portion to close the opening portion; A winding body for winding a string-like body having one end connected to the left and right lower ends of the door curtain; A winding shaft to which the winding body is attached at both left and right end edges; a bearing portion disposed on the inside of the winding body in the left-right direction with a gap therebetween and attached to a bracket on the body side in a state of abutting from the outside in the left-right direction; a balance spring mechanism, one end of which is attached to the bracket and the other end of which is attached to a winding shaft, and which stores energy in association with the movement of the door curtain toward the closed position; In an overhead door device comprising: When a collar is attached to the gap between the winding body and the bearing portion to restrict the movement of the winding body and the bearing portion toward each other, The overhead door device is characterized in that the collar is configured to be detachably attached to the winding shaft, and by removing the collar, the winding body is allowed to move inwardly in the left-right direction relative to the winding shaft.

2. 2. The overhead door device according to claim 1, wherein the collar is divided into a plurality of collar portions in the left-right direction, and at least one of the divided collar portions is detachably attached to the winding shaft.

3. 3. The overhead door device according to claim 2, wherein the collar is divided into two parts, and the collar part on the side of the winding body of the divided collar parts is detachably attached to the winding shaft.

4. A door curtain that is bendable in the front-rear direction and has a plurality of running rollers at both left and right end edges with a vertical gap therebetween; A guide rail that guides the door curtain to an open position in which the door curtain is oriented horizontally along the ceiling portion to open the opening portion by the running rollers, and a closed position in which the door curtain is oriented vertically along the opening portion to close the opening portion; A winding body for winding a string-like body having one end connected to the left and right lower ends of the door curtain; A winding shaft to which the winding body is attached at both left and right end edges; a bearing portion disposed on the inside of the winding body in the left-right direction with a gap therebetween and attached to a bracket on the body side in a state of abutting from the outside in the left-right direction; a balance spring mechanism, one end of which is attached to the bracket and the other end of which is attached to a winding shaft, and which stores energy in association with the movement of the door curtain toward the closed position; In an overhead door device comprising: A method for assembling the winding shaft to be supported by left and right brackets, the method including: a step of removing a collar detachably attached in a gap between the winding body and the bearing portion and moving the winding body at one end in the left-right direction inward in the left-right direction; - A step of fitting one end side of the winding shaft into the bracket on that side in an inclined state in which the one end side is close to the bracket on that side; - A step of fitting the other end of the winding shaft into the bracket on that side in a state where the tilted state is corrected; a step of moving the winding shaft to the other end side to position it at the attachment position, and moving the moved winding body to the attachment position; - attaching the removed collar and the winding body moved to the attachment position to the winding shaft; A method for installing a take-up shaft in an overhead door device, comprising the steps of:

5. The collars are detachably attached to the gaps between the winding bodies and the bearings on both the left and right sides, and the method includes the steps of: - A step of removing the collar on one end of the winding shaft before the step of assembling the other end of the winding shaft into the bracket; a step of moving the bearing portion on the other end of the winding shaft outward in the left-right direction before the step of fitting the other end of the winding shaft into the bracket; a step of moving the bearing portion on the other end side that has been moved to a mounting position, and then mounting the collar on the other end side to a winding shaft; 5. The method of claim 4, further comprising the steps of:

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