JP2013217164A - Overhead door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overhead door which prevents the lowermost panel from being damaged by allowing it to curve when an impact is added.SOLUTION: In an overhead door, a shutter curtain 7 is formed by bendably connecting the required number of panels 8, both ends of the panels 8 are provided with guide rails 4, 5, 6 which guide opening and closing of the shutter curtain 7, and the shutter curtain 7 goes up and down along the guide rails 4, 5, 6. The lowermost panel of the shutter curtain 7 is a flexible panel 14 having flexibility, and the flexible panel 14 is connected to a panel adjacent to the upper part of the flexible panel 14 by both end hinges 9 installed on both ends of the flexible panel 14 and a separatable and connectable crush type intermediate hinge 15 installed on a central part thereof.

Description

  The present invention relates to an overhead door that opens and closes an opening, such as a doorway of a building structure such as a building, with a shutter curtain configured by connecting a required number of panels in a freely bendable manner.

  There is a shutter device as an opening and closing means for opening and closing an opening of a building structure such as a building, and there is an overhead door as one of the shutter devices, in which the shutter curtain has a required number of panels at both ends. The shutter curtain is configured to be freely bent by a hinge provided at the center, and the shutter curtain is raised and lowered along the guide rail. When the shutter curtain is opened, the shutter curtain is stored along the ceiling surface.

  When an overhead door is used by a forklift or other transporting machine and used in a warehouse, especially in a refrigeration facility, for example, the forklift claw collides with the bottom panel of the overhead door, and the bottom panel is damaged. There are many things to do.

  Therefore, in order to prevent damage due to collision with the transporting machine, the lowermost panel is made flexible so that the lowermost panel is curved when colliding with the transporting machine. To prevent damage.

  However, the upper panel connected to the lower panel is firmly connected by a steel hinge, and is bent by the upper panel via an intermediate hinge when an impact is applied to the lower panel. Is obstructed, and the lowermost panel and the upper and lower frame materials of the lowermost panel may be damaged, and there is a problem that repair costs are required for repair in the event of damage.

  In order to prevent the lowermost panel from being damaged, a pair of attachment pieces having high rigidity and an intermediate piece made of a soft resin that is easily bent and stretched in a substantially U shape integrally provided between the attachment pieces. The intermediate hinge of the intermediate hinge is bent and expanded and contracted when an impact is applied to the lowermost panel, so that the lowermost panel smoothly curves and deforms to prevent breakage. Since the intermediate piece deteriorates by repeated bending and expansion / contraction, the durability is difficult.

JP 2000-337005 A

  In view of such a situation, the present invention provides an overhead door that prevents breakage by allowing bending when an impact is applied to the lowermost panel.

  In the present invention, a shutter curtain is configured by flexibly connecting a required number of panels, guide rails for guiding opening and closing of the shutter curtain are provided at both ends of the panel, and the shutter curtain extends along the guide rail. An overhead door that moves up and down, wherein the lowermost panel of the shutter curtain is a flexible panel having flexibility, the panel adjacent to the upper side of the flexible panel, both-end hinges provided at both ends, and a center The invention relates to an overhead door connected by a crush-type intermediate hinge that can be connected separately.

  According to the present invention, the crash type intermediate hinge includes a female hinge and a male hinge, and the female hinge has a pair of female connecting portions at both ends, and a connecting hole and the connecting hole are formed on an inner surface of the female connecting portion. An introduction groove continuous to the hole is formed, and the male hinge has a pair of male connection parts that can be inserted into the female connection part at both ends, and the male connection part has the introduction hole through the introduction groove. A connecting projection that can be fitted is formed, and the female hinge and the male hinge are separated and connected to each other through fitting and detaching of the connecting hole and the connecting projection.

  According to the present invention, the flexible panel is composed of a hard rubber core member having a fitting portion and a pair of hard resin frame members attached to the core member via the fitting portion. An overhead door that relates to an overhead door having a frame member, and that has a reinforcing plate held between the upper and lower frame members, a heat insulating material that sandwiches the reinforcing plate, and a surface sheet that is attached to the surface of the heat insulating material. In addition, the upper and lower frame members relate to overhead doors in which steel plates are embedded in the width direction.

  According to the present invention, a pair of guide rollers is provided at both ends of the panel, and the guide rollers are provided on one side of the guide rail, and the overhead door rolls along one side of the guide rail.

  Further, according to the present invention, a door stopper is provided at a rear end of the guide rail, and the door stopper includes a contact shaft that contacts an upper end of the uppermost panel, and a damping device that absorbs an impact applied to the contact shaft. The above-described damping device has an overhead having a guide portion in which the contact shaft advances and retreats, a bending portion that is continuously curved to the guide portion, and a damping portion that is continuous to the bending portion and is provided with a compression spring at the base end. It relates to the door.

  According to the present invention, a shutter curtain is configured by flexibly connecting a required number of panels, guide rails for guiding opening and closing of the shutter curtain are provided at both ends of the panel, and the shutter curtain is attached to the guide rail. An overhead door that moves up and down along the lowermost panel of the shutter curtain is a flexible panel having flexibility, and the flexible panel is adjacent to the upper panel of the flexible panel and hinges at both ends. Are connected by a crush type intermediate hinge that can be separated and connected at the center, so that when the impact is applied to the flexible panel, the flexible panel is bent without being interrupted by the crush type intermediate hinge. It is possible to prevent an increase in repair cost due to breakage of the flexible panel.

  According to the present invention, the crash type intermediate hinge includes a female hinge and a male hinge, and the female hinge has a pair of female connecting portions at both ends, and a connecting hole is formed on the inner side surface of the female connecting portion. An introduction groove continuous to the connection hole is formed, and the male hinge has a pair of male connection parts that can be inserted into the female connection part at both ends, and the male connection part has the introduction groove in the connection hole. And the female hinge and the male hinge are separated and connected through the fitting / removal of the connecting hole and the connecting protrusion, so that the female hinge is connected to the female hinge via the introduction groove. By easily separating and connecting the male hinge, it can be used repeatedly, and durability can be improved and maintenance costs can be reduced.

  According to the invention, the flexible panel includes a hard rubber core member having a fitting part and a pair of hard resin frame members attached to the core member via the fitting part. Further, since the upper and lower frame members are provided, it is possible to prevent damage due to an impact applied when the resin is cured at a low temperature.

  Further, according to the present invention, the reinforcing plate includes the reinforcing plate held between the upper and lower frame members, the heat insulating material for inserting the reinforcing plate, and the surface sheet attached to the surface of the heat insulating material. Therefore, it is possible to prevent bending due to a vertical load, and the flexible panel is not easily broken from the outside by a blade or the like.

  Further, according to the present invention, since the upper and lower frame members are embedded with steel plates in the width direction, even if the top sheet is peeled off from the heat insulating material, the steel plates are used as the back plate by screws or rivets. Can be repaired.

  According to the present invention, a pair of guide rollers are provided at both ends of the panel, and the guide rollers sandwich one side of the guide rail and roll along the one side of the guide rail. It is possible to prevent the occurrence of noise by rattling in the guide rail, and to prevent reverse rotation resistance caused by a change in the rotation direction of the guide roller during opening and closing, thereby improving operability.

  Furthermore, according to the present invention, a door stopper is provided at the rear end of the guide rail, the door stopper is a contact shaft that contacts the upper end of the uppermost panel, and a damping that absorbs an impact applied to the contact shaft. The damping device includes a guide portion in which the contact shaft advances and retreats, a bending portion that is continuously curved to the guide portion, and a damping portion that is continuous to the bending portion and is provided with a compression spring at the base end. Therefore, it is not necessary to provide a large depth at the rear end of the guide rail in order to provide the door stopper, and an excellent effect that space can be saved can be achieved.

1 is a schematic perspective view of an overhead door according to an embodiment of the present invention. It is a schematic sectional elevation view of the overhead door. FIGS. 2A and 2B are views taken along the line A-A in FIG. 1, in which FIG. 1A illustrates a state in which a crash type intermediate hinge according to an embodiment of the present invention is coupled, and FIG. ing. It is a front view of the crash type intermediate hinge. It is a side view of the said crash type intermediate hinge, (A) shows the state from which the crash type intermediate hinge was isolate | separated, (B) has shown the state by which the crash type intermediate hinge was connected. It is explanatory drawing which shows the state which the lowermost flexible panel based on the Example of this invention curved. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a sectional side view which shows a door stopper.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, referring to FIGS. 1 and 2, an overhead door according to an embodiment of the present invention will be described.

  A vertical guide rail 4 is provided along both side pillars 3 of the opening 2 of the housing 1 such as a building, a horizontal guide rail 5 is provided along the ceiling, and the vertical guide rail 4 and the horizontal guide rail 5 are They are connected by a curved guide rail 6. Each of the vertical guide rail 4, the horizontal guide rail 5, and the curved guide rail 6 has a U-shaped cross section. When the ceiling is inclined, the horizontal guide rail 5 is also provided in an inclined state. However, the horizontal guide rail is collectively referred to as the horizontal guide rail.

  A shutter curtain 7 is slidably provided along the vertical guide rail 4, the curved guide rail 6, and the horizontal guide rail 5, and the shutter curtain 7 has a required number of panels 8 having both end hinges 9 and a required number of intermediate hinges. 11 is connected to bend freely.

  A pair of guide rollers 12 and 13 are rotatably provided at both ends of each panel 8 via a support shaft (described later). The lowermost panel is a flexible panel 14 having flexibility, and is connected to the panel 8 adjacent to the upper side via a crash type intermediate hinge 15 described later.

  The guide roller 12 is movably fitted to the vertical guide rail 4, the curved guide rail 6, and the horizontal guide rail 5, and the guide roller 13 includes the vertical guide rail 4, the curved guide rail 6, The horizontal guide rail 5 is provided so as to sandwich the guide roller 12. The guide rollers 12, 13 roll freely with respect to the vertical guide rail 4, the curved guide rail 6, and the horizontal guide rail 5, and the shutter curtain 7 has the vertical guide rail 4, the curved guide rail 6, It can slide along the horizontal guide rail 5.

  A bracket 16 is provided at the rear end of the horizontal guide rail 5, and a fixing bracket 18 that holds a door stopper 17 is attached to the bracket 16 via a fixing tool 19 such as a bolt. The door stopper 17 has a contact shaft 21, and the contact shaft 21 is urged toward the opening 2 by a compression spring described later. The bracket 16 is provided with a long hole 20 extending vertically, and the position of the door stopper 17 in the height direction can be adjusted through the long hole 20.

  A horizontal take-up drum shaft 22 and the like are provided above the vertical guide rail 4, and the take-up drum shaft 22 is attached to the housing 1 via a bracket 23. The take-up drum shaft 22 is rotatably provided on the bracket 23 and is rotated by a manual driving device 24, for example, an operating tool that hangs a chain on a chain wheel. A winding drum 25 is provided at both ends of the winding drum shaft 22, and a wire 26 wound around the winding drum 25 is engaged with a closing side end of the shutter curtain 7. The take-up drum shaft 22 is provided with a balance spring 27 that urges the wire 26 wound around the take-up drum 25 in the winding direction. The shutter curtain 7 is urged in the upward direction.

  The driving device 24 is connected to a sprocket 28 fitted to one end of the winding drum shaft 22 by a chain 29. A chain 32 is hung and suspended from a chain wheel 31, and the winding drum shaft 22 is rotated via the chain 29 and the sprocket 28 by rotating the chain 32 in a required direction. The shutter curtain 7 is moved via the shutter curtain 7 so that the opening 2 is opened and closed by the shutter curtain 7.

  When the opening 2 is opened, the chain 32 is operated so that the winding drum 25 is rotated via the winding drum shaft 22, whereby the wire 26 is wound, and the shutter curtain 7 is moved. It is pulled up along the vertical guide rail 4 and further stored in the horizontal guide rail 5. When the shutter curtain 7 is pulled up vigorously, the upper end of the uppermost panel 8 collides with the tip of the contact shaft 21, and a compression spring for urging the contact shaft 21 is used. The impact at the time of collision is absorbed by the elastic force.

  When the opening 2 is closed, the chain 32 is rotated in the reverse direction, the winding drum 25 is rotated in the reverse direction via the winding drum shaft 22, and the wire 26 is fed out. Thus, the shutter curtain 7 is lowered and the opening 2 is closed.

  Next, the details of the flexible panel 14 will be described with reference to FIGS.

  The flexible panel 14 has an upper frame member 33 and a lower frame member 33 'which are aggregates in the vertical direction. Since the upper frame member 33 and the lower frame member 33 'have the same structure and are vertically symmetrical, the upper frame member 33 will be described below. The upper frame member 33 is constituted by a core member 34 and a pair of rigid polyvinyl chloride frame members 35 and 35 fitted to the core member 34 in the front-rear direction (left-right direction toward the paper surface in FIG. 3). Has been. The core member 34 is formed with T-shaped fitting portions 36, 36 protruding in the front-rear direction, a core portion 37 protruding from the upper surface of the frame member 35, and a width on the lower surface of the core portion 37. A reinforcing plate holding groove 38 is formed over the entire length in the direction (direction perpendicular to the paper surface in FIG. 3).

  The frame members 35 and 35 are integrated with the core member 34 via the fitting portions 36 and 36. On the upper surface of the frame member 35, drainage seal mounting recesses 39 are formed over the entire length in the width direction. A draining seal 41 made of a soft resin is attached to the frame member 35 constituting the lower frame member 33 ′ on the lower side through the draining seal attaching recesses 39, 39.

  In addition, steel plates 42 and 42 as reinforcing members are embedded in the frame members 35 and 35, at positions facing the fitting portions 36 and 36.

  A reinforcing plate 43, which is a strength member such as a steel plate, is inserted in the reinforcing plate holding grooves 38, 38 over the upper and lower core members 34, 34. In the front-rear direction of the reinforcing plate 43, soft heat insulating panel materials 44 and 44, which are heat insulating materials such as polyethylene foam, are provided, and the outer surfaces of the soft heat insulating panel materials 44 and 44 are respectively soft vinyl chloride. The surface sheets 46 and 46 made of the material are bonded to the upper frame members 33 and 33 with an adhesive.

  The panel 8 adjacent to the upper side of the flexible panel 14 is a hard heat insulating panel made of, for example, a hard resin having heat insulating properties, and a fitting concave groove 47 into which the core part 37 can be fitted is formed on the lower surface. Is formed. When the panel 8 and the flexible panel 14 are connected, the core part 37 is fitted in the fitting groove 47.

  A female hinge 48 of the crash type intermediate hinge 15 is fixed to the upper frame member 33 by fastening a fixing tool 49 such as a bolt to the steel plate 42 at the upper end of the inner side surface of the flexible panel 14. The A male hinge 51 of the crash type intermediate hinge 15 is fixed to a lower end portion of the inner side surface of the panel 8 via a fixing tool 52 such as a bolt.

  Next, details of the crash type intermediate hinge 15 will be described with reference to FIGS. 4, 5 </ b> A and 5 </ b> B.

  The female hinge 48 is a member formed of, for example, a resin material having low thermal conductivity, a rectangular plate-shaped mounting portion 54 in which a mounting hole 53 for mounting to the flexible panel 14 is formed, and the mounting portion. There are female connecting portions 55, 55 extending vertically from the upper ends on both sides of 54. The female connecting portions 55, 55 are bent in a direction (outside) away from each other by the elastic force of the resin.

  The female connecting portion 55 has a substantially disc shape, and a connecting hole 56 is recessed in the center of the inner side surface of the female connecting portion 55 (the surface opposite to the female connecting portions 55, 55). The female connecting portion 55 is provided with an introduction groove 57 having a depth smaller than that of the connecting hole 56 from the connecting hole 56 to the peripheral end of the female connecting portion 55 (in the direction of the page in FIG. 4). The introduction groove 57 is gradually widened in the direction away from the mounting portion 54 and the depth is gradually increased.

  The male hinge 51 is a member formed of, for example, a resin material of the same material as the female hinge 48, and has an attachment hole 58 for attachment to the panel 8, and the female coupling portion is more than the female hinge 48. A rectangular plate-shaped mounting portion 59 narrowed by the thickness of 55, 55 and male connecting portions 61, 61 extending vertically from lower ends on both sides of the mounting portion 59 are provided. The male connecting portions 61, 61 are bent inward by the elastic force of the resin.

  The male connecting portion 61 has a substantially disk shape similar to the female connecting portion 55, and is a central portion of the outer surface of the male connecting portion 61 (the surface opposite to the opposing surface of the male connecting portions 61, 61). A connection protrusion 62 that can be fitted into the connection hole 56 is formed. The connection protrusion 62 has a hemispherical shape so that it can be fitted into and removed from the connection hole 56.

  When attaching to the flexible panel 14 and the panel 8, the crash type intermediate hinge 15 is first assembled. The connection projection 62 of the male hinge 51 is fitted into the introduction groove 57, and the male hinge 51 is pushed toward the female hinge 48. The connection protrusion 62 slides on the introduction groove 57, and the male connection portion 61 is gradually bent inward by a wedge effect due to the inclination of the introduction groove 57, and the connection protrusion 62 and the connection protrusion 62 In a state where the connecting hole 56 is matched, the connecting projection 62 is fitted into the connecting hole 56 by the elasticity of the male connecting portion 61.

  The crush type intermediate hinge 15 in which the female hinge 48 and the male hinge 51 are flexibly coupled is assembled by fitting the coupling projection 62 into the coupling hole 56 (FIGS. 5A and 5B). )reference). At this time, the depth of the introduction groove 57 and the height of the connection protrusion 62 are set according to the bending state of the female connection portions 55 and 55 and the male connection portions 61 and 61, and the crash type intermediate hinge 15 is They are not easily disassembled except in the direction in which the introduction groove 57 is formed.

  After assembly of the crash type intermediate hinge 15, the female hinge 48 is fixed to the flexible panel 14 by the fixing tool 49 through the mounting hole 53, and the male hinge 51 is fixed to the fixing tool 58 through the mounting hole 58. The crash type intermediate hinge 15 is attached by being fixed to the panel 8 by 52.

  When an impact is applied to the flexible panel 14 from the inside, such as when a claw of a forklift collides with the crash type intermediate hinge 15 attached, a force acts diagonally downward on the flexible panel 14. As shown in FIG. 3B or FIG. 6, the core portion 37 is extracted from the fitting concave groove 47, and the female hinge 48 and the male hinge 51 are disengaged. Bends to the outdoor side.

  In this state, for example, when an operator presses the flexible panel 14 from the outdoor side toward the indoor side, the flexible panel 14 returns to the original state, and the core portion 37 enters the fitting groove 47. At the same time, the female hinge 48 and the male hinge 51 are connected again.

  As described above, in this embodiment, the flexible panel 14 and the central portion of the panel 8 adjacent to the flexible panel 14 are connected by the crash type intermediate hinge 15. The crash type intermediate hinge 15 is easily connected to the female hinge 48 and the male hinge 51 when an impact is applied to the flexible panel 14 from the indoor side, that is, the side to which the crash type intermediate hinge 15 is attached. Since they are separated from each other, the bending of the flexible panel 14 is not hindered by the crush-type intermediate hinge 15, and the flexible panel 14 can be prevented from being damaged when it is bent.

  Further, in a state where the flexible panel 14 is curved toward the outdoor side, an operator pushes the flexible panel 14 toward the indoor side from the outdoor side, that is, from the opposite side where the crash type intermediate hinge 15 is attached. As the flexible panel 14 returns to its original state, the female hinge 48 and the male hinge 51 are connected again, so that the crash type intermediate hinge 15 can be used repeatedly, and the durability is improved. Improvements and reductions in repair costs can be achieved.

  In addition, since the crash type intermediate hinge 15 is formed of a resin material having low thermal conductivity, heat insulation can be improved, and condensation occurs on the crash type intermediate hinge 15 due to a temperature difference between indoor and outdoor. It is possible to prevent the bending and separation of the crush type intermediate hinge 15 from being hindered due to freezing of the generated and condensed water.

  Moreover, since the flexible panel 14 comprises an aggregate by combining the pair of the frame members 35 and the core member 34 made of hard rubber, the flexible panel 14 is cooled by a freezing / refrigeration facility and the resin is cured. Even in this case, the upper frame member 33 can be prevented from being damaged.

  Further, since the reinforcing plate 43 is provided between the upper frame member 33 and the lower frame member 33 ', it is possible to prevent the flexible panel 14 from being bent due to a vertical load, improve durability, and externally by a blade or the like. Thus, the flexible panel 14 can be prevented from being broken, and crime prevention can be improved.

  Further, since the steel plate 42 is embedded in the upper frame member 33, when the top sheet 46 is peeled off from the flexible panel 14, the plate material is pressed from the top sheet 46 so that the steel plate 42 is backed. The surface sheet 46 can be clamped and fixed between the plate material and the upper frame member 33 by screws, rivets or the like as a plate, and repair on site can be easily performed.

  In the present embodiment, the crash type intermediate hinge 15 is formed of a resin material. However, if it is not necessary to consider heat insulation, such as a normal warehouse that is not a refrigeration facility, the crash type intermediate hinge 15 is used. The hinge 15 may be formed of a metal material having high elasticity, for example, a thin plate obtained by press molding.

  Next, with reference to FIGS. 7 and 8, the structure of the guide rollers 12 and 13 and their surroundings will be described.

  Guide rail support parts 63 are fixed to the both side pillars 3 with a predetermined number of bolts 64 at a predetermined interval, and guide rails (the vertical guide rails 4 in FIG. 7) are not shown on the guide rail support parts 63. It is fixed and supported by a fixing tool such as. The hole through which the fixing tool of the guide rail support 63 is inserted is larger than the diameter of the fixing tool, and the angle of the vertical guide rail 4 can be adjusted.

  As shown in FIG. 8, the panels 8, 8 adjacent to each other in the vertical direction are connected to both ends by bending hinges 9 so as to be freely bent. The both-end hinges 9 bend the main hinge 67a attached to the upper end of the lower panel 8; the sub hinge 67b attached to the lower end of the upper panel 8; and the main hinge 67a and the sub hinge 67b. It is comprised with the hinge pin 70 connected freely.

  FIG. 7 shows the lower panel 8, and a reinforcing plate 65 covering from the side surface to the inner surface side end portion is fixed to the panel 8 by a bolt 66 from the side surface of the panel 8. The main hinge 67 a having a U-shaped cross section is fixed to the upper end side and the inner surface side end side of the panel 8 with a bolt 68. Although not shown, the reinforcing plate 65 is also fixed to the upper panel 8 in the same manner as the lower panel 8, and the sub hinge is provided on the lower end side and the inner surface side end side of the reinforcing plate 65. 67 b is fixed by the bolt 68.

  Support shafts 69 and 71 of the guide rollers 12 and 13 are horizontally provided in the main hinge 67a. The guide rollers 12 and 13 are rotatably provided on the main hinge 67a, and one side 4a of the vertical guide rail 4 is inserted by the guide rollers 12 and 13, and one side 4a of the vertical guide rail 4 is inserted. , The guide rollers 12 and 13 roll.

  In the above description, the case where the guide rollers 12 and 13 sandwich the one side 4a of the vertical guide rail 4 has been described. However, the guide rollers 12 and 13 are similarly applied to the curved guide rail 6 and the horizontal guide rail 5. 13 rolls along one side of the curved guide rail 6 and the horizontal guide rail 5.

  In this embodiment, the pair of guide rollers 12 and 13 are provided so as to sandwich one side of the guide rail, so that the guide roller 12 and one side of the guide rail, the guide roller 13 and the guide rail There is no need to provide a gap with one side, and the guide rollers 12 and 13 are prevented from rattling and vibrating in the guide rail during strong winds or when the shutter curtain 7 is opened and closed. Can do.

  Further, since the guide rollers 12 and 13 do not rattle in the guide rail, the rotation direction of the guide rollers 12 and 13 changes during the opening and closing of the shutter curtain 7 due to rattling, and reverse rotation resistance is generated. It is possible to prevent deterioration of operability, improve operability, prevent wear of the guide rollers 12 and 13 due to reverse rotation resistance, and improve durability.

  7 and 8, the upper and lower adjacent panels 8 and 8 have been described. However, the flexible hinge 14a and the flexible panel 14 and the flexible hinge 14 are similarly described. The auxiliary hinge 67b and the hinge pin 70 are connected to each other by the both-end hinges 9 so as to be freely bent.

  Next, the details of the door stopper 17 will be described with reference to FIG.

  The door stopper 17 has the contact shaft 21 having a hard rubber contact portion 72 at the tip and a damping device 73. The attenuating device 73 includes a straight cylindrical guide portion 74 in which the contact shaft 21 is advanced and retracted, a U-shaped cylindrical curved portion 75 that is bent by 180 °, and a straight cylindrical attenuation portion 76 that is parallel to the guide portion 74. And have. The tip of the attenuating portion 76 is closed, and the guide portion 74, the bending portion 75, and the attenuating portion 76 are continuously connected.

  A compression spring 77 is provided at the base end of the damping portion 76, and a pressing shaft 78 is provided at the tip of the compression spring 77. Further, the contact shaft 21 and the pressing shaft 78 are connected by a universal bending portion 79.

  The universal bending portion 79 includes a required number of spherical rotating bodies 81, a rotating shaft 82 that is orthogonal to the axis of the contact shaft 21 and the pressing shaft 78, and passes through the center of the rotating body 81, and each rotating body 81. And a bendable turn guide 83 provided over the rotating shaft 82. The guide portion 74, the bending portion 75, and the attenuation portion 76 are moved in accordance with the advancement and retraction of the contact shaft 21. The rotating body 81 is configured to move while rolling about the rotating shaft 82.

  When the shutter curtain 7 (see FIG. 2) is pulled up vigorously, the upper end of the uppermost panel 8 stored in the horizontal guide rail 5 (see FIG. 2) collides with the contact portion 72.

  When the upper end of the panel 8 contacts the contact portion 72, a force is applied to the contact shaft 21 in the direction of the arrow in FIG. 9, and the rotation of the free bending portion 79 connected to the contact shaft 21 is performed. While the body 81 rolls, the body 81 moves in the guide portion 74, the bending portion 75, and the attenuation portion 76, and the compression spring 77 is pressed through the pressing shaft 78.

  When the compression spring 77 is pressed, the impact force applied to the contact shaft 21 is absorbed, and the uppermost panel 8 is stored in the horizontal guide rail 5 without being damaged.

  In the present embodiment, the damping device 73 of the door stopper 17 has a cylindrical guide part 74, a cylindrical curved part 75 curved by 180 °, and a cylindrical damping part parallel to the guide part 74. 76, and the impact force applied to the contact shaft 21 is absorbed by the compression spring 77 provided at the base end of the damping portion 76, so that the horizontal guide rail 5 It is sufficient if there is a slight space above, and space can be saved without increasing the depth.

  In the present embodiment, the rotating body 81 is connected by the turn guide 83 that spans the rotating shaft 82. However, the rotating body 81 is connected in a daisy chain, and the guide portion 74, the bending portion 75, and the damping portion are connected. The rotating body 81 may be configured to slide within the portion 76.

  Further, if the guide portion 74 is provided with a protrusion preventing portion for the rotating body 81, the rotating bodies 81 can be connected to each other, and the universal bending portion 79 can be an aggregate of the rotating bodies 81.

  Further, when there is no slight space above the horizontal guide rail 5, the attenuation device 73 can be bent by 90 ° in the horizontal direction.

4 Vertical guide rail 5 Horizontal guide rail 6 Curved guide rail 7 Shutter curtain 8 Panel 12 Guide roller 13 Guide roller 14 Flexible panel 15 Crash type intermediate hinge 17 Door stopper 33 Upper frame member 33 'Lower frame member 34 Core member 35 Frame member 42 Steel Plate 43 Reinforcement Plate 44 Soft Insulation Panel Material 46 Top Sheet 48 Female Hinge 51 Male Hinge 55 Female Connection Portion 56 Connection Hole 57 Introduction Groove 61 Male Connection Portion 62 Connection Projection 73 Damping Device

Claims (7)

  An overhead door in which a shutter curtain is configured by flexibly connecting a required number of panels, guide rails for guiding opening and closing of the shutter curtain are provided at both ends of the panel, and the shutter curtain moves up and down along the guide rail The lowermost panel of the shutter curtain is a flexible panel having flexibility, and the flexible panel is provided at a panel adjacent to the upper side of the flexible panel, both hinges provided at both ends, and a central part. An overhead door characterized by being connected by a crush-type intermediate hinge that can be separated and connected.   The crash-type intermediate hinge is composed of a female hinge and a male hinge, and the female hinge has a pair of female connecting portions at both ends, and is connected to the connecting hole and the connecting hole on the inner surface of the female connecting portion. A groove is formed, and the male hinge has a pair of male connecting portions that can be inserted into the female connecting portion at both ends, and the male connecting portion can be connected to the connecting hole through the introducing groove. The overhead door according to claim 1, wherein a projection is formed, and the female hinge and the male hinge are separated and connected through fitting and detaching of the coupling hole and the coupling projection.   The flexible panel includes an upper and lower frame member configured by a hard rubber core member having a fitting portion and a pair of hard resin frame members attached to the core member via the fitting portion. The overhead door according to claim 1 or 2.   The overhead door according to claim 3, comprising a reinforcing plate held between the upper and lower frame members, a heat insulating material for inserting the reinforcing plate, and a surface sheet attached to a surface of the heat insulating material.   The overhead door according to claim 3 or 4, wherein a steel plate is embedded in the width direction in the upper and lower frame members.   The overhead according to any one of claims 1 to 5, wherein a pair of guide rollers are provided at both ends of the panel, and the guide rollers roll in along one side of the guide rail. door.   A door stopper is provided at the rear end of the guide rail, and the door stopper includes a contact shaft that contacts an upper end of the uppermost panel, and a damping device that absorbs an impact applied to the contact shaft. 7. A guide portion in which the contact shaft advances and retreats, a bending portion that is continuous and curved with the guide portion, and a damping portion that is continuous with the bending portion and is provided with a compression spring at the base end. One of the overhead doors.

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