JP5680990B2 - Folding door assist device - Google Patents

Description

  The present invention relates to a folding door assist device including a plurality of door panels. For example, the assist device can assist the closing of the folding door, which has been closed to a predetermined position, to the fully closed position, or can assist the opening of the folding door, which has been opened to the predetermined position, to the fully opened position.

  In relation to the present invention, a folding operation return mechanism that can fully close a folding door from any open position is known (Patent Document 1). There, the first door on the door end side and the second door on the hanging side are connected so as to be foldable, and the first door is supported so as to be opened and closed by a runner guided by a guide rail. The runner is closed and urged by a constant torque spring, and the runner can be closed to the fully closed position by the constant torque spring regardless of the position of the open / close region. In addition, an air damper is provided near the closed end of the open / close stroke of the runner so that the folding door can be moved slowly to the fully closed position.

  Similarly, a folding door having a self-closing function and a braking function is known from Patent Document 2. There, first and second gears that mesh with each other are provided in adjacent portions of the first door and the second door, and when the folding door is opened, the accumulating spring is wound with the second gear that rotates together with the second door. It is tightened. The opened folding door can be automatically closed to the closing position by the spring force accumulated in the accumulator spring, and a braking device is provided on the first gear side in order to slowly close the folding door on the closed end side. The braking device includes a container that stores the viscous fluid and a rotation resistance plate that is stored in the container, and a rotation shaft of the rotation resistance plate is connected to the first gear via a one-way clutch. When the folding door is automatically closed by the spring force of the accumulator spring, the first gear is rotationally driven by the second gear, and the power is transmitted to the rotational resistance plate via the one-way clutch and the rotational shaft. The folding door is prevented from abruptly closing due to the fluid friction of the viscous fluid acting on.

Japanese Patent No. 3321098 (paragraph number 0034, FIG. 4) Japanese Patent Laying-Open No. 2007-315052 (paragraph number 0012, FIG. 3)

  According to the folding operation return mechanism of Patent Document 1, the folding door can be automatically closed from any open position to a fully closed position. In addition, since the runner is closed and biased by the constant torque spring, the operation force when the first door is opened can always be kept constant, and the folding door can be opened easily. However, since a constant torque spring, which is more expensive than a normal spring body, is used as a drive source, the overall cost of the folding operation return mechanism increases. Further, since the output of the constant torque spring is small, there is a disadvantage that the application target is limited to a relatively lightweight folding door. Furthermore, since the life of the constant torque spring is short, there is also annoyance that must be periodically replaced. Since the space occupied by the entire device including the constant torque spring and air damper is large, there is no problem when constructing a new folding door, but we want to renovate the existing folding door, or renovate the existing swing door to a folding door. In this case, it is difficult to install the entire apparatus in terms of space.

  In that respect, according to the folding door of Patent Document 2, since the self-closing device and the braking device are arranged above the adjacent portions of the first door and the second door, the existing swing door can be converted into a folding door. Applicable. The problem is that the self-closing device and the braking device are arranged between the first and second doors and the guide rail, so that the self-closing device and the braking device are always exposed, and there is a problem in appearance. . In addition, since the tension of the accumulator spring increases in proportion to the degree of opening of the folding door, for example, a large force is required to fully open the folding door while sitting in a wheelchair. Furthermore, there is an inconvenience that the folding door must be kept fully open while passing through the door opening, and the door cannot be opened and closed as a whole.

  The inventors of the present invention studied to close the runner with a tension coil type spring instead of the constant torque spring and urge it without permission. This is because if a tension coil spring is used as a drive source, the cost can be reduced, a necessary output can be secured, and the life can be significantly improved compared to a constant torque spring.

  However, the tension of the tension coil spring increases in proportion to the degree of opening of the folding door, similar to the accumulation spring of Patent Document 2. In addition, it is inevitable that the tension of the spring decreases as the second door approaches the closed end. For this reason, it becomes difficult to fully close the second door by overcoming the deformation resistance of the packing provided on the door frame and the braking force of the air damper, and there is an inconvenience of having to manually return the folding door to the fully closed state. is there. If the initial tension of the tension coil spring is increased, the second door can be fully closed and tightly attached to the packing, but this requires that a large force be applied to the second door when the folding door is opened. It becomes difficult to open the lightly.

The object of the present invention is to open and close the folding door lightly while using a coil-shaped spring as a drive source, and to close and open the folding door slowly and reliably from the middle of the opening and closing stroke toward the moving end. Another object of the present invention is to provide a folding door assist device.
SUMMARY OF THE INVENTION An object of the present invention is to provide a folding door assist device that can be applied in a wide range regardless of the size and weight of the door, and that does not require replacement of spring parts over a long period of time. .
An object of the present invention is to provide a folding door assist device capable of assisting in closing and simultaneously opening the folding door.

The assist device according to the present invention includes a folding door in which a plurality of door panels 1 and 2 are connected in a foldable manner so that the first door panel 1 arranged on the closed end side is guided by a guide rail 5 via a runner 6. Applies to As shown in FIG. 1, the assist device includes a first support structure including a coil-shaped first spring 21 that moves and operates the first door panel 1 from the middle part of the opening / closing stroke of the first door panel 1 toward the moving end. And a second support structure including a coil-shaped second spring 22 that operates to move the first door panel 1 toward the moving end in cooperation with the first spring 21 from an intermediate portion of the expansion / contraction stroke of the first spring 21. And. Further, the assist device moves along with the runner 6 to switch the states of the first support structure and the second support structure, and sets the first spring 21 and the second spring 22 to the power storage state, or the first power storage state in the first power storage state. There is provided a switching tool 60 that puts the first spring 21 and the second spring 22 into an output state. Further, the assist device includes a braking structure that is disposed on the moving end side of the first door panel 1 and brakes the movement of the runner 6 toward the moving end. The first support structure magnetically attracts the first spring 21, the slide block 31 and the first magnet 56 fixed to the output end of the spring 21, and the first magnet 56 in a state where the first spring 21 is accumulated. And a first spring holding body 58. The second support structure magnetically attracts the second spring 22, the end block 30 and the second magnet 57 fixed to the output end of the spring 22, and the second magnet 57 in a state where the second spring 22 is stored. And a second spring holding body 59. The first support structure, the second support structure, and the braking structure are accommodated in a guide frame 15 that is arranged in parallel with the guide rail 5, and the guide frame 15 is connected to the first rail frame 17 that is adjacent to the front and rear. A second rail frame 18 and a partition wall 20 that divides both rail frames 17 and 18 in the front-rear direction are provided. A first support structure and an air cylinder 23 constituting a braking structure are arranged on the first rail frame 17, and a second support structure is arranged on the second rail frame 18. The first door panel 1 is moved from a predetermined open position toward the moving end by the biasing force of the first spring 21, and the biasing force of the second spring 22 is applied during the movement of the first door panel 1. The first door panel 1 is moved to the moving end while braking the movement. The assist device can be used as a device that supports the closing operation of the folding door by changing the assembly position with respect to the folding door, or can be used as a device that supports the opening operation of the folding door.

The switching tool 60 is configured to move in the guide frame 15 as the runner 6 moves in the guide rail 5. A first spring holding body 58 is arranged in the middle of the moving stroke of the switching tool 60 accompanying the folding opening / closing operation of the first door panel 1 in the guide frame 15 and moves more than the first spring holding body 58 in the guide frame 15. A second spring holding body 59 is disposed near the end.

  The tension of the second spring 22 is set larger than the tension of the first spring 21. The expansion / contraction stroke of the second spring 22 is set within a range of ½ to ¼ of the expansion / contraction stroke of the first spring 21. In the present invention, the expansion / contraction strokes of the springs 21 and 22 mean effective distances in which the springs 21 and 22 are actually expanded and contracted when expanding and contracting in the closing direction or the opening direction.

  When the first door panel 1 is in an open position inclined about 30 degrees with respect to the longitudinal direction line of the guide frame 15, the second spring holding body 59 is disposed at a position where the switching tool 60 can be attached to and detached from the second magnet 57. (See FIG. 11B). Further, when the first door panel 1 is in the open position inclined about 45 degrees with respect to the longitudinal direction line of the guide frame 15, the first spring holder 58 is in a position where the switching tool 60 can be attached to and detached from the first magnet 56. (See FIG. 11C).

  A proximal block 29 is fixed near the closed ends of the first rail frame 17 and the second rail frame 18. As shown in FIG. 7, the first spring 21 and the air cylinder 23 are arranged vertically adjacent between the slide block 31 and the base end block 29 accommodated in the first rail frame 17. As shown in FIG. 8, the second spring 22 is disposed between the end block 30 and the base end block 29 accommodated in the second rail frame 18.

  In another assist device according to the present invention, a plurality of door panels 1 and 2 are connected so as to be foldable and openable, and the first door panel 1 disposed on the closed end side is guided by a guide rail 5 via a runner 6. Applies to some folding doors. The assist device includes a closing support device that supports closing of the first door panel 1 from the middle of the opening / closing stroke of the first door panel 1 toward the closing end, and a second assisting device from the middle of the opening / closing stroke of the first door panel 1 toward the opening end. It consists of an opening support device that supports opening of the one-door panel 1. The opening support device moves along with the runner 6 and the opening support structure including the coil-shaped opening spring 72 that moves the first door panel 1 from the middle of the opening / closing stroke of the first door panel 1 toward the opening end. The opening support structure is switched to place the opening spring 72 in the accumulating state, or the switching tool 60 that puts the opening spring 72 in the accumulating state into the output state, and the opening end side of the first door panel 1. And a braking structure for braking the movement of the runner 6 to the open end. The closing support device is configured by an assist device that supports the closing operation of the folding door described above.

  In the opening support structure, the opening spring 72, the slide block 77 and the third magnets 91 and 92 fixed to the output end of the opening spring 72, and the third magnets 91 and 92 are magnetized in a state where the opening spring 72 is stored. The third spring holder 96 adsorbs.

The guide frame 15 includes a first rail frame 17 and a second rail frame 18 that are adjacent to each other in the front-rear direction, and a partition wall 20 that divides both the rail frames 17 and 18 in the front-rear direction. An open end block 75 is fixed near the open ends of the first rail frame 17 and the second rail frame 18. An opening spring 72 and a damper 73 are arranged between the slide block 77 accommodated in the rail frames 17 and 18 and the open end block 75, so that the assist device is unitized.

  In the present invention, the first support structure and the second support structure provided with the coil-shaped first spring 21 and the second spring 22, the switching tool 60 for switching the state of these support structures, and the moving end of the runner 6 The assist device is configured with a braking structure that brakes movement to the vehicle. In this assist device, the first door panel 1 is moved from a predetermined open position toward the moving end by the urging force of the first spring 21, and the urging force of the second spring 22 is applied during the movement so that the first door panel 1 is moved. 1 can be slowly moved to the moving end while braking with the braking structure.

  As described above, if the urging force of the second spring 22 is applied to increase the closing operation force in the middle of closing the first door panel 1, the first door panel 1 can be reliably moved with a larger operation force even in the vicinity of the moving end. Can be moved. Therefore, despite the slow movement of the first door panel 1 due to the braking structure, the folding door is completely moved to the fully closed position by overcoming the elastic force of the packing provided on the opening frame 14 and the resistance to overcoming the latch. It can be closed or fully opened to the fully open position. Further, when the first door panel 1 is opened or closed from the moving end, the second spring 22 is held in the accumulated state during the operation, and the operation resistance by the second spring 22 can be reduced. Therefore, according to the assist device of the present invention, the folding door can be opened and closed more easily than when a single coil spring is used as a drive source.

  In addition, since the first and second support structures are configured by using the first spring 21 and the second spring 22 that are inexpensive coil springs as the driving sources, the assisting device is more effective than the conventional device using the constant torque spring as the driving source. The overall cost of the apparatus can be reduced. In addition, the first spring 21 and the second spring 22 can be freely set in tension and size, and can change the initial tension and expansion / contraction stroke, so that the first spring 21 and the second spring 22 can be widely applied even when the door size and weight are different. Furthermore, unlike the constant torque spring, it is not necessary to replace the spring parts over a long period of time, and maintenance costs can be saved.

  The first spring 21, the slide block 31, the first magnet 56, and the first spring holding body 58 constitute a first support structure, and the second spring 22, the end block 30, the second magnet 57, and the second spring holding body 59 are included. If a 2nd support structure is comprised, the power storage state of the 1st, 2nd springs 21 and 22 can be hold | maintained with a magnetic adsorption structure only by opening / closing the 1st door panel 1. FIG. Moreover, the tension | tensile_strength of the 1st, 2nd spring 21 * 22 can be output at a predetermined timing by attracting | sucking and accompany each magnet 56 * 57 with the switching tool 60 accompanying the runner 6 intermittently. Therefore, the user can perform the close assist operation and the open assist operation of the folding door accurately by switching the state of the assist device by simply opening and closing the folding door as usual. Further, in the middle of the opening / closing stroke, the first and second springs 21 and 22 are attracted by the first and second spring holders 58 and 59 to be held in the accumulated state. After the power storage state, the folding door can be opened and closed easily, or the folding door can be held in the fully closed position or fully opened position.

  If the tension of the second spring 22 is set larger than the tension of the first spring 21, the first door panel 1 can be moved and operated with a larger operating force near the moving end of the opening / closing stroke of the first door panel 1, and therefore the first The door panel 1 can be opened and closed more reliably to the moving end. When the expansion / contraction stroke of the second spring 22 exceeds half of the expansion / contraction stroke of the first spring 21, the tension of the second spring 22 is overcome and the second magnet 57 is attracted to the second spring holder 59. The operating force (distance) increases, which imposes a burden on the user. Further, if the expansion / contraction stroke of the second spring 22 is less than a quarter of the expansion / contraction stroke of the first spring 21, the acceleration by the second spring 22 is insufficient, and the first door panel 1 is moved to the moving end. It may not be possible to operate. For these reasons, it is preferable to set the expansion / contraction stroke of the second spring 22 within a range of one-half to one-fourth of the expansion / contraction stroke of the first spring 21.

  When the first door panel 1 is in an open position inclined about 30 degrees with respect to the longitudinal direction line of the guide frame 15, the first door panel 1 is fully closed if the switching tool 60 can be attached to and detached from the second magnet 57. Alternatively, it is possible to reduce the initial operation force when moving from the fully open position. This is because, since the moment arm around the runner shaft 11 is large from the start of movement to the open position where the first door panel 1 is inclined by about 30 degrees, the first door panel 1 can be moved with a smaller operating force. Furthermore, since the amount of movement of the runner 6 is only slight until the first door panel 1 is tilted by about 30 degrees, the rate of increase in tension of the first and second springs 21 and 22 is small. This is because the one-door panel 1 can be moved and operated with a smaller force. Further, after the second magnet 57 is attracted to the second spring holder 59, it is sufficient to store only the first spring 21 having a smaller tension than the second spring 22, and an operation required for opening the first door panel 1 is required. The power can be further reduced.

  When the first door panel 1 is in an open position inclined about 45 degrees with respect to the longitudinal direction line of the guide frame 15, the first magnet 56 is the first magnet 56 when the switching tool 60 can be attached to and detached from the first magnet 56. After being adsorbed by the spring holder 58, the first door panel 1 can be opened and closed with the springs 21 and 22 separated. Therefore, when the first door panel 1 swings from 45 degrees to 90 degrees, or when swings from 45 degrees to 0 degrees, the operation force when the first door panel 1 swings can be reduced, coupled with the ability to reduce the initial operation force of the first door panel 1. As a whole, the folding door can be opened and closed easily.

  A guide frame 15 is constituted by the first rail frame 17 and the second rail frame 18 adjacent to each other in the front-rear direction, the first support structure and the air cylinder 23 are provided in the first rail frame 17, and the second support structure is provided in the second rail frame 18. When the assist device is arranged and unitized, it can be handled easily. For example, at the construction site, an assist device made into a unit part may be attached to the opening frame 14, and the labor and cost required for construction can be reduced by eliminating the trouble of assembling the components constituting the assist device. Since the first rail frame 17 and the second rail frame 18 are divided forward and backward by the partition wall 20, the operation interference between the first support structure and the air cylinder 23 and the second support structure is prevented, and the operation reliability of the assist device is prevented. Can be improved.

  Between the slide block 31 provided on the first rail frame 17 and the base end block 29, the first spring 21 and the air cylinder 23 are disposed adjacent to each other in the vertical direction, and the end block provided on the second rail frame 18 is further provided. If the 2nd spring 22 is arrange | positioned between 30 and the base end block 29, the assist device can be comprised compactly using the internal space of the guide frame 15 effectively. Therefore, an assist device can be added to the folding door by securing a space for installing the guide frame 15. Furthermore, if necessary, even an existing swing door can be easily refurbished into a folding door provided with an assist device. Further, by changing the fixing positions of the base end block 29 and the first and second spring holders 58 with respect to the guide frame 15, it is possible to smoothly hold the accumulated state of the springs 21 and 22 and adjust the spring output. It can cope with the difference in the left and right width of the folding door. Moreover, at the time of construction, the operation start position of the assist device can be easily adjusted.

  The assist device according to the present invention includes a closing support device that supports closing of the first door panel 1 and an opening support device that supports opening of the first door panel 1. According to this assist device, the first door panel 1 can be closed automatically with the assisting device for closing, while braking from a predetermined open position to a closed position. In addition, the first door panel 1 can be automatically closed by the opening support device while braking from the predetermined opening position to the full opening position. As described above, according to the assist device constituted by the close assist device and the open assist device, the user automatically and slowly closes and opens the folding door at both the close end and the open end, respectively. Can be saved. In addition, since the closing support and the opening support are performed while braking the movement of the runner 6 by the braking structure, the folding door can be opened and closed slowly and safely even when the folding door is opened and closed roughly.

  When the opening support structure is configured by the opening spring 72, the slide block 77, the third magnets 91 and 92, and the third spring holder 96, the third magnet 91 is moved to the third position simply by closing the first door panel 1. The open spring 72 can be held in the accumulated state by being attracted to the spring holder 96. Moreover, the tension | tensile_strength of the open spring 72 can be output at a predetermined | prescribed timing by isolate | separating the 3rd magnet 91 from the 3rd spring holding body 96 with the switching tool 60 accompanying the runner 6. FIG. Therefore, the user can perform the close assist operation and the open assist operation of the folding door accurately by switching the state of the assist device by simply opening and closing the folding door as usual.

  An open end block 75 and a slide block 77 are assembled to the first rail frame 17 and the second rail frame 18, and an open spring 72 and a damper 73 are arranged between the both 75 and 77, so that the assist device is unitized. Then, the handling can be performed easily. For example, at the construction site, an assist device made into a unit part may be attached to the opening frame 14, and the labor and cost required for construction can be reduced by eliminating the trouble of assembling the components constituting the assist device.

It is a top view of the closing assistance device concerning the present invention. It is a front view of a folding door. It is a top view of a folding door and a closing assistance device. It is a top view which shows the relationship structure of a runner and a closing assistance apparatus. It is a disassembled perspective view of a closing assistance apparatus. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is the EE sectional view taken on the line in FIG. It is a top view which shows operation | movement of a closing assistance apparatus. It is a graph which shows the relationship between a spring force and the rocking | fluctuation angle of a door panel. It is a top view which shows schematic structure of the opening / closing assistance apparatus which concerns on this invention. It is a top view which shows the relationship structure of a runner and an opening / closing assistance apparatus. It is the FF sectional view taken on the line in FIG. It is the GG sectional view taken on the line in FIG. It is the HH sectional view taken on the line in FIG. It is a top view which shows the relationship structure of a runner and an opening / closing assistance apparatus. It is the JJ sectional view taken on the line in FIG.

(Example) FIGS. 1-12 shows the Example of the closing assistance apparatus (assist apparatus) based on this invention. In the present invention, “front / rear”, “left / right”, and “upper / lower” refer to the crossed arrows shown in FIGS. In FIG. 2, the folding door is configured by connecting a first door panel (door panel) 1 having a large left-right width and a second door panel (door panel) 2 having a small left-right width so as to be folded openable and closable via a hinge 4. . A suspension base of the second door panel 2 is pivotally supported by a pair of upper and lower pivot shafts 3 so as to be swingable and openable.

  As shown in FIG. 6, a guide rail 5 is fixed to the upper frame of the opening frame 14, the runner 6 is guided to move by the guide rail 5, and the first door panel 1 on the door end side is suspended by the runner 6. doing. The runner 6 is attached to the left and right center of the upper end surface of the first door panel 1 and travels and moves left and right in the guide rail 5 along with the folding opening / closing operation of the first door panel 1. The runner 6 is configured by rotatably supporting rollers 9 and 10 on the left and right sides of the runner body 8 and on the left and right sides of the lower surface, respectively, and suspends the first door panel 1 via the runner shaft 11. (See FIG. 4). The first door panel 1 opens and closes while rotating about the runner shaft 11 to swing and displace the second door panel 2. Reference numeral 7 denotes a door handle provided on the front and rear surfaces of the first door panel 1 on the closed end side.

  A closing support device is provided between the runner 6 and the opening frame 14 in order to automatically close the first door panel 1 from the middle of the opening / closing stroke toward the closing end (moving end). Further, after the closing assist device starts operating, a braking structure for braking the closing movement of the runner 6 is provided on the moving end side of the first door panel 1 in order to slowly move the first door panel 1 to the fully closed position. Provided.

  The closing support device includes a first support structure, a second support structure, and a switching tool 60 that switches the states of both the first and second support structures. Both the first and second support structures are accommodated in a guide frame 15 disposed on the front side of the opening frame 14. As shown in FIGS. 5 and 6, the guide frame 15 includes a base wall 16 that is fixed to the lower surface of the opening frame 14, a first rail frame 17 that opens downward continuously to the base wall 16, and a first rail. It consists of an aluminum strip provided integrally with a second rail frame 18 continuing to the frame 17. The lower side of the second rail frame 18 opens toward the first rail frame 17, and this opening is denoted by reference numeral 19. A partition wall shared by the first rail frame 17 and the second rail frame 18 is denoted by reference numeral 20. A braking structure and a first spring 21 of the first support structure are arranged inside the first rail frame 17, and a second spring 22 of the second support structure is arranged inside the second rail frame 18.

  The braking structure is configured using the air cylinder 23 as a braking element. Specifically, as shown in FIG. 5, a brake structure is configured by a cylinder body 24, a piston rod 25, an adjustment valve 26 disposed at the base end portion (closed end side) of the cylinder body 24, and the like. The adjustment valve 26 is provided with an adjustment screw 27 that adjusts the amount of air pushed out by the piston, and a check valve (not shown) that allows air to enter the cylinder body 24. By adjusting the adjustment screw 27, the closing speed of the first door panel 1 can be adjusted to be large or small according to the difference in size and weight of the folding door. The air cylinder 23 exerts a braking action only when the piston rod 25 retreats into the cylinder body 24, and can extend in a state with little resistance when the piston rod 25 advances from the cylinder body 24.

  The first support structure and the second support structure are composed of first and second springs 21 and 22, a base end block 29, an end block 30, a slide block 31, a magnetic adsorption structure, and the like. The first door panel 1 is closed by operating the second springs 21 and 22 stepwise. The first spring 21 and the second spring 22 are each constituted by a tension coil spring, and the second spring 22 is set such that the wire diameter and the coil diameter of the second spring 22 are larger than the wire diameter and the coil diameter of the first spring 21. Is set to be larger than the tension of the first spring 21.

  In FIG. 5, the base block 29 is formed of a plastic molded product having an L-shaped longitudinal section integrally including a rectangular parallelepiped block main body 34 and a base portion 35 extending from the rear lower portion of the block main body 34. The block main body 34 is accommodated in the second rail frame 18, and the base portion 35 is accommodated in the first rail frame 17. That is, the base end block 29 is disposed in the guide frame 15 in a state where the first rail frame 17 and the second rail frame 18 are straddled through the opening 19. An operation hole 36 for the adjustment screw 27 and a screw insertion hole 37 are formed in the base portion 35 so as to penetrate vertically. The fixed end of the first spring 21 is connected to the side end of the base portion 35 via a pin 38, and the fixed end of the second spring 22 is connected to the block body 34 via a pin 39. The base end block 29 is fixed to the first rail frame 17 together with the base end portion of the cylinder body 24 by a fastening screw 40 and a plate nut 41 inserted through the screw insertion hole 37 from the lower surface side (see FIGS. 7 and 9). ). In this attached state, the adjustment screw 27 described above protrudes below the proximal end block 29 through the operation hole 36.

  The end block 30 is a plastic molded product integrally including a rectangular parallelepiped passive portion 44 accommodated on the first rail frame 17 side and a rectangular parallelepiped connecting portion 45 accommodated on the second rail frame 18 side. Consists of. The passive portion 44 and the connecting portion 45 are provided in a state where the passive portion 44 is displaced toward the closed end side by the left and right width of the connecting portion 45. This is because the slide block 31 is received by the passive portion 44. An insertion hole 46 for the piston rod 25 is formed in the upper half portion of the passive portion 44, and a relief groove 47 for the first spring 21 is formed in a state of opening downward in the lower half portion. A mounting recess 48 for the second magnet 57 is formed at the side end of the connecting portion 45. The output end of the second spring 22 is connected to the connecting portion 45 by a pin 49.

  The slide block 31 is formed of a rectangular parallelepiped plastic molded product corresponding to the previous passive portion 44, and a mounting recess 51 for the first magnet 56 is formed at a side end thereof, and the mounting hole 52 is in communication with the mounting recess 51. Is formed sideways. The end of the piston rod 25 is inserted into the mounting hole 52 and connected with a pin 53. Further, the output end of the first spring 21 is connected to the slide block 31 using the pin 53. In this way, by supporting the air cylinder 23 with the base end block 29 and the slide block 31, the slide block 31 moves in the first rail frame 17 in conjunction with the expansion and contraction operations of the piston rod 25 and the first spring 21. It can slide to the left and right. The end block 30 and the slide block 31 are guided by the first rail frame 17, the second rail frame 18, and guide ribs provided on the partition wall 20 so that only the left and right slides are possible (see FIGS. 6 and 10).

  The magnetic attraction structure includes a vertically long rectangular parallelepiped first magnet 56 and second magnet 57, and first and second spring holders 58 and 59 disposed on the first and second rail frames 17 and 18, respectively. (Refer to FIG. 1) and a switching tool 60 that moves along with the runner 6. The first magnet 56 is fixed to the mounting recess 51 of the slide block 31 via the suction base 62, and the second magnet 57 is fixed to the mounting recess 48 of the connecting portion 45 via the suction base 63. The suction bases 62 and 63 are formed in a T shape by adjoining two base metal fittings made of magnetic metal plates bent in an L shape in a back-to-back manner. Fixed to 48/51. Thus, the first magnet 56 is fixed to the output end of the first spring 21 via the slide block 31, and the second magnet 57 is fixed to the output end of the second spring 22 via the end block 30.

  The first spring holding body 58 and the second spring holding body 59 are each made of a press fitting bent in an L shape, and are formed from a magnetic metal plate represented by a steel plate. The first spring holder 58 is fixed to the upper wall of the first rail frame 17 with screws, and the adsorption wall 64 faces the upper half of the first rail frame 17 (see FIG. 7). Similarly, the second spring holder 59 is fixed to the upper wall of the second rail frame 18 with screws, and the suction wall 65 faces the upper half of the second rail frame 18 (see FIG. 8). The first spring holding body 58 and the second spring holding body 59 are disposed above the moving region of the switching tool 60 and are attracted to the upper half portions of the first and second magnets 45 and 46. The second spring holder 59 is disposed between the first spring holder 58 and the moving end of the first door panel 1 (see FIG. 11).

  The switching device 60 is formed of a flat press fitting made of a magnetic metal plate, and integrally includes a main surface wall 68 fixed to the runner 6 and an adsorption arm 69 folded upward from one front side of the main surface wall 68. In preparation. The main surface wall 68 is fixed to the lower surface of the runner body 8 and crosses the guide rail 5 and the guide frame 15 back and forth along the lower surface of the opening frame 14. The suction arm 69 enters the lower half side of the first rail frame 17 and further enters the lower half side of the second rail frame 18 through the opening 19 (see FIG. 6). It attracts | sucks to the lower half part of the 2nd both magnets 56 * 57.

  As described above, the first support structure has the first spring 21, the slide block 31 and the first magnet 56 fixed to the output end of the spring 21, and the state where the first spring 21 is accumulated. The first magnet 56 is composed of a first spring holder 58 that magnetically attracts the first magnet 56. The first support structure moves and operates the first door panel 1 from the middle part of the opening / closing stroke of the first door panel 1 toward the closed end (moving end).

  The second support structure magnetically attracts the second spring 22, the end block 30 and the second magnet 57 fixed to the output end of the spring 22, and the second magnet 57 in a state where the second spring 22 is stored. And the second spring holder 59. The second support structure operates to move the first door panel 1 toward the closed end in cooperation with the first spring 21 from the middle of the expansion / contraction stroke of the first spring 21. By the first and second support structures, the first door panel 1 is moved from the predetermined open position toward the closed end by the urging force of the first spring 21, and the second spring 22 is moved during the movement of the first door panel 1. Thus, the first door panel 1 can be moved to the closed end while braking the movement by the braking structure.

  The closing support device starts the closing support operation in a state where the first door panel 1 is inclined by about 45 degrees with respect to the longitudinal direction line of the guide rail 5. When the first door panel 1 is operated to close beyond this starting position, the closing operation is first supported only by the first spring 21, and then the second spring 22 cooperates with the first spring 21 to perform the closing operation. Support. In order to operate the first spring 21 and the second spring 22 at different timings in this way, as shown in FIG. 11, the first spring holding body 58 is disposed in the middle of the opening / closing stroke of the first door panel 1, The two spring holders 59 are arranged in the middle of the expansion / contraction stroke of the first spring 21.

  Specifically, as shown in FIG. 11C, when the first door panel 1 is in the open position inclined about 45 degrees with respect to the longitudinal direction line of the guide frame 15, the suction arm 69 of the switching tool 60 is moved to the first spring. The first spring holder 58 is disposed at a position where it can be attached to and detached from the suction wall 64 of the holder 58. As shown in FIG. 11B, when the first door panel 1 is in the open position inclined about 30 degrees with respect to the longitudinal direction line of the guide frame 15, the suction arm 69 of the switching tool 60 is held by the second spring. The second spring holding body 59 is arranged at a position where it can be attached to and detached from the suction wall 65 of the body 59.

  In this embodiment, when the first door panel 1 is in the fully closed position (position shown in FIG. 11 (a)), the first spring 21 is extended 210 mm from the reference position at the output end. The provided first magnet 56 is attracted to the first spring holder 58 (see FIG. 11C). Similarly, in a state where the second spring 22 extends 80 mm from the reference position, the second magnet 57 provided at the output end is attracted to the second spring holding body 59 (see FIG. 11B). .

  The closing stroke of the second spring 22 is preferably set within a range of 1/2 (0.5) to 1/4 (0.25) of the closing stroke of the first spring 21. When the closing stroke of the second spring 22 exceeds one half of the closing stroke of the first spring 21, the tension of the second spring 22 is overcome and the second magnet 57 is attracted to the second spring holder 59. It is inevitable that the operating force (distance) increases. Further, if the closing stroke of the second spring 22 is less than a quarter of the closing stroke of the first spring 21, the acceleration by the second spring 22 is insufficient, and the first door panel 1 is brought to the fully closed position. Move operation may not be possible. In this embodiment, since the closing stroke of the second spring 22 is 80 mm and the closing stroke of the first spring 21 is 210 mm, the ratio of the closing stroke of the second spring 22 to the closing stroke of the first spring 21 is 0. 38.

  Below, the detail of operation | movement of the closing assistance apparatus and braking structure in a use condition is demonstrated. When the first door panel 1 is in the closed position, both the first and second springs 21 and 22 exhibit initial tension in a contracted state, and most of the piston rod 25 is retracted into the cylinder body 24. It is in the state that entered. Further, the lower half portions of the first and second magnets 56 and 57 are attracted to the attracting arm 69 of the switching tool 60.

  When the first door panel 1 is pushed in from the above state, the first door panel 1 rotates about the runner shaft 11, and at the same time, the second door panel 2 rotates while accompanying the first door panel 1. At this time, the runner 6 moves to the open end side by an amount corresponding to the amount of rotation of the second door panel 2, but the change in the amount of movement becomes a cosine curve. Therefore, the lateral movement of the runner 6 in a state in which the first door panel 1 is started to be opened from the closed position is small, and therefore, the tension increase between the first spring 21 and the second spring 22 is only slight. Moreover, the first door panel 1 in the closed position can be easily opened by applying a force in a direction perpendicular to the panel surface.

  As shown in FIG. 11B, when the first door panel 1 is opened until it is rotated about 30 degrees with respect to the longitudinal direction line of the guide rail 5, it is fixed to the end block 30 as shown in FIG. The upper half of the second magnet 57 is attracted to the adsorption wall 65 of the second spring holder 59. Therefore, the end block 30 is prevented from moving by the second spring holder 59, and the attracting arm 69 is separated from the second magnet 57. Thereby, the 2nd spring 22 is adsorbed and held in the 2nd standby position in the state where it was accumulated.

  Further, when the first door panel 1 is opened, the amount of lateral movement of the runner 6 increases, but only the first spring 21 accompanies the suction arm 69, so the opening operating force suddenly decreases. As shown in FIG. 11C, when the first door panel 1 is opened until the first door panel 1 rotates about 45 degrees with respect to the longitudinal line of the guide rail 5, the first door panel 1 fixed to the slide block 31 as shown in FIG. The upper half of one magnet 56 is attracted to the adsorption wall 64 of the first spring holder 58. Therefore, the slide block 31 is prevented from moving by the first spring holder 58, and the attracting arm 69 is separated from the first magnet 56. Accordingly, the first spring 21 is attracted and held at the first standby position in a state where the first spring 21 is accumulated. Since the subsequent opening operation of the first door panel 1 is not affected by the first spring 21 and the second spring 22, it can be opened more easily. Further, by stopping the opening operation of the first door panel 1 at any opening position where the rotation angle is between 45 degrees and 90 degrees, the first door panel 1 can be held at that position.

  When the first door panel 1 is closed after passing through the opening frame 14, the attracting arm 69 moves sideways to the closing side together with the runner 6 and eventually attracts the lower half of the first magnet 56 provided on the slide block 31. , Move sideways to the closing side while maintaining this state. FIG. 7 shows a state immediately before the attracting arm 69 is attracted to the first magnet 56. With the closing movement of the switching tool 60, the upper half of the first magnet 56 is separated from the first spring holder 58, and the first spring 21 that is stored at the same time as the first magnet 56 is separated by the tension of the first spring 21. The door panel 1 is closed and operated. That is, after the first magnet 56 is separated from the first spring holder 58, the closing assist device starts to operate, and therefore it is not necessary to close the first door panel 1.

  Simultaneously with the separation of the first magnet 56 from the second spring holder 59, the piston rod 25 accompanies the slide block 31 and retreats into the cylinder body 24. Therefore, a braking force by the air cylinder 23 acts on the runner 6, and the first door panel 1 moves slowly toward the closed end.

  When the first door panel 1 is further closed and moved, the attracting arm 69 is laterally moved to the closing side while being attracted to the lower half of the second magnet 57 provided on the end block 30. As a result, the upper half of the second magnet 57 is separated from the second spring holder 59, and thereafter, the first door panel 1 is fully closed by the total tension of the first spring 21 and the second spring 22. It is closed and operated. As described above, the amount of movement of the runner 6 in the vicinity of the closed end is very small. However, since the tension of the first spring 21 and the tension of the second spring 22 act on the runner 6 at the same time, the first door panel 1 is overcome by overcoming the elastic force of the packing provided on the opening frame 14 and the resistance to climb over the latch. Can be fully closed.

  When the first door panel 1 is opened, the first and second springs 21 and 22 are held while the attracting arm 69 is attracted to the lower half of the first and second magnets 45 and 46. The first and second magnets 56 and 57 can be attracted to the first and second spring holders 58 and 59 in order, and the two springs 21 and 22 can be stored. Can be kept waiting.

  12 shows the change in the swing angle of the first door panel 1 when the folding door is opened and closed, and the lower half of FIG. 12 shows the spring force of the first and second springs 21 and 22. Shows changes. The horizontal axis in FIG. 12 is the movement distance of the runner 6 with the fully closed position as the movement start point. The amount of movement of the first door panel 1 is determined by a change in the swing angle of the second door panel 2 and changes in a cosine curve shape. Therefore, the amount of movement of the runner 6 in the vicinity of the fully open position and the fully closed position is small, and is maximum at an intermediate position (45 ° position) between the fully open position and the fully closed position. The tension of the first spring 21 is output when the first magnet 56 is separated from the first spring holding body 58 to close and move the first door panel 1. Further, while the first spring 21 is contracted in the closing direction, the second magnet 57 is separated from the second spring holding body 59 so that the tension of the second spring 22 is output, and the first door panel 1 is moved with a larger force. Move to the fully closed position. Accordingly, even when the air cylinder 23 is braked, the first door panel 1 can be reliably moved to the fully closed position.

  According to the closing assist device configured as described above, it is necessary to apply a large operating force to the left from the start of opening the first door panel 1 until the second magnet 57 is attracted to the second spring holder 59. The first door panel 1 can be opened easily. This is because the moment arm around the runner shaft 11 is large from the start of the opening of the first door panel 1 to the opening position where the first door panel 1 is inclined about 30 degrees with respect to the longitudinal direction line of the guide frame 15. This is because, since the amount of movement of the runner 6 is only small, the rate of increase in tension between the first and second springs 21 and 22 is small, and the first door panel 1 can be opened with a smaller force.

  Further, after the second magnet 57 is attracted to the second spring holding body 59, it is sufficient to store only the first spring 21 having a lower tension than the second spring 22, and it is necessary to open the first door panel 1. The operating force can be further reduced. Further, after the first magnet 56 is attracted to the first spring holder 58, the first door panel 1 can be opened with the springs 21 and 22 disconnected. Therefore, compared with the case where the runner is closed and urged by one coil spring, the folding door can be easily opened and closed, and a closing support device suitable for the folding door can be obtained. In addition, the folding door that has been closed to the predetermined position can be slowly and reliably closed to the fully closed position.

  Since the closing support device is configured using the first spring 21 and the second spring 22 made of coil springs as drive sources, the overall cost of the closing support device can be reduced compared to a conventional device using a constant torque spring as the drive source. Further, since the first spring 21 and the second spring 22 can be freely set in tension and size, they can be widely applied regardless of the size and weight of the door, and there is no need to replace the spring parts over a long period of time. Maintenance costs can be saved. Since most of the structural members of the closing support device are accommodated inside the guide frame 15, it is possible to easily provide a closing support device even for an existing swing door simply by securing a space for installing the guide frame 15. Can be refurbished to a folding door.

  As described above, the proximal block 29 is fixed to the guide frame 15 with the fastening screws 40 screwed from the lower surface side. Therefore, the fastening screw 40 is loosened to adjust the fixing position of the base end block 29, the fixing position of the first spring 21 and the second spring 22 and the cylinder body 24 in the guide frame 15 is changed, and the runner 6 By changing the fixing position with respect to the first door panel 1, it is possible to cope with the difference between the left and right widths of the folding door. Moreover, at the time of construction, the operation start position of the closing support device can be easily adjusted.

  The assist device according to the present invention can be used as an opening support device. In that case, the closing support device may be disposed near the open end of the guide frame 15 in the opposite direction to the above embodiment. .

  13 and 19 show a folding door opening / closing support device (assist device) capable of performing a closing support operation and an opening support operation. The opening / closing support device includes a closing support device that supports the closing of the first door panel 1 from the middle of the opening / closing stroke of the first door panel 1 toward the closing end, and the middle of the opening / closing stroke of the first door panel 1 toward the opening end. An opening support device that supports opening of the first door panel 1 is provided.

  Since the closing assistance device has substantially the same structure as the closing assistance device described above, the same members as those in the previous closing assistance device are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 19, the guide frame 15 constituting the assist device is basically the same as the guide frame 15 described above, but the dividing wall shared by the first rail frame 17 and the second rail frame 18. The difference is that the vertical dimension of 20 is small. Moreover, the rib structure which slide-guides the end block 30 and the slide block 31 differs. A first spring 21 and an air cylinder 23 and an open spring 72, which will be described later, are arranged inside the first rail frame 17, and a second spring 22 and a damper (braking structure) 73, which will be described later, are arranged inside the second rail frame 18. It is.

  In FIG. 14, the opening support device includes an opening support structure provided with a tension coil-shaped opening spring 72, a switching tool 60 that moves together with the runner 6 to switch the state of the opening support structure, and an opening end of the runner 6. It is comprised with the damper 73 which brakes a movement. The damper 73 is a cylinder-type oil damper in which oil is sealed inside the cylinder 74, and the base end portion of the cylinder 74 is fixed to an open end block 75 fixed to the open end of the guide frame 15, and the piston rod 76 protruding ends are connected to the slide block 77. The damper 73 exhibits a braking action when the piston rod 76 retreats into the cylinder 74.

  As shown in FIGS. 15 and 16, the open end block 75 is made of a plastic molded product having a cross-shaped L-shaped cross section straddling the first rail frame 17 and the second rail frame 18, and from the lower surface side of the block wall. The inserted fastening screw 78 is screwed into the plate nut 79 and fixed to the guide frame 15. An open spring 72 is connected by a pin 80 to the block wall on the first rail frame 17 side. A connecting groove 81 having a U-shaped cross section is formed on the block wall on the second rail frame 18 side, and the base end portion of the cylinder 74 is engaged with and fixed to the connecting groove 81 so as not to move left and right. Yes (see FIG. 15).

  As shown in FIG. 15 and FIG. 17, the slide block 77 includes a sliding portion 83 having a concave cross section, an arm portion 84 projecting from the sliding portion 83 toward the open end, and an arm portion 84. It consists of a plastic molded product that is integrally provided with a holder portion 85 that projects from the bottom of the continuous projecting end. The sliding portion 83 is slidably guided by the upper half of the first rail frame 17 and the second rail frame 18, and the output end of the release spring 72 is connected to the side surface of the open end side by a pin 86. It is. In order to accommodate the opening spring 72, a U-shaped escape groove 87 is formed on the upper surface of the arm portion 84.

  Mounting recesses 89 and 90 are formed on the side surfaces of the sliding portion 83 and the holder portion 85 on the closed end side, and third magnets 91 and 92 are inserted into the mounting recesses 89 and 90 via the suction bases 93 and 94, respectively. It is fixed. The suction bases 93 and 94 are formed by bending a magnetic metal plate into an L shape, and are fixed to the mounting recesses 89 and 90 with pins 86 and 95, respectively. As described above, by providing the third magnets 91 and 92 in the sliding portion 83 and the holder portion 85, the position where the switching tool 60 is attracted to the third magnet 92 on the holder portion 85 side, and the third spring holder 96. Can be made different in the opening / closing direction. It should be noted that the position where the switching tool 60 is attracted to the third magnet 92 and the position where the third spring holder 96 is attracted to the third magnet 91 can coincide with each other. What is necessary is just to fix a magnet to the slide block 77. FIG.

  The first rail frame 17 corresponding to the opening spring 72, the opening end block 75, the slide block 77 fixed to the output end of the opening spring 72, the third magnets 91 and 92, and the third magnets 91 and 92. The third spring holding body 96 fixed to the upper wall constitutes an opening support structure. The third spring holder 96 is formed of an L-shaped press fitting made of the same magnetic metal plate as the first spring holder 58, and the adsorption wall 97 avoids the moving region of the switching tool 60, and the first rail frame 17. (See FIG. 15). By attracting the third magnet 91 provided on the sliding portion 83 with the attracting wall 97, the open spring 72 can be held in a stored state.

  Since the operation of the closing support device in the opening / closing support device configured as described above is as described above, only the operation of the opening support device will be described. When the first door panel 1 is further opened after the first spring 21 of the closing assist device is held in the accumulated state, both door panels 1 and 2 are opened at the open end of the opening frame 14 as shown by an imaginary line in FIG. The runner 6 moves to the vicinity of the pivot shaft 3 as it is refracted in a V shape. And when the 1st door panel 1 inclines 82 degree | times with respect to the longitudinal direction line of the guide frame 15, after the adsorption | suction arm 69 of the switching tool 60 passes under the 3rd spring holding body 96, as shown in FIG. The slide block 77 is moved along with the first door panel 1 by being attracted to the third magnet 92 on the holder portion 85 side.

  With the movement of the switching tool 60, the third magnet 91 provided on the sliding portion 83 is separated from the adsorption wall 97 of the third spring holding body 96. Simultaneously with this separation operation, the tension of the open spring 72 acts on the runner 6 via the switching tool 60, so that the first door panel 1 is pulled to the open end by the open spring 72. Further, while the piston rod 76 of the damper 73 is retracted into the cylinder 74, the first door panel 1 is braked and slowly moved to the fully open position. In the state where the first door panel 1 is fully opened, the opening spring 72 exerts an initial tension and is slightly tensed, and most of the piston rod 76 is retracted into the cylinder 74.

  When the first door panel 1 is closed from the fully opened state, the switching tool 60 accompanying the runner 6 moves toward the closed end while the third magnet 92 on the holder portion 85 side is attracted. As a result, the open spring 72 connected to the slide block 77 is gradually extended, and at the same time, the piston rod 76 is pulled out from the cylinder 74. Eventually, the third magnet 91 provided on the sliding portion 83 is attracted to the adsorption wall 97 of the third spring holder 96. In this attracted state, the movement of the slide block 77 is blocked by the third spring holder 96, so the attracting arm 69 of the switching tool 60 is separated from the third magnet 92 on the holder portion 85 side. As a result, the open spring 72 is attracted and held at the standby position in a state where power is accumulated. Thereafter, as already described, the attracting arm 69 of the switching tool 60 is attracted to the first magnet 56, and the first magnet 56 is separated from the first spring holding body 58, thereby closing the first door panel 1 and supporting device. Can be automatically closed.

  In the above embodiment, in order to retrofit the existing swing door, the guide frame 15 is provided separately from the guide rail 5 and the components of the assist device are accommodated therein, but this is not necessary. For example, the first rail frame 17 and the second rail frame 18 of the guide frame 15 can be formed integrally with the guide rail 5. In that case, the first rail frame 17 and the second rail frame 18 are collectively arranged on either one of the front and rear sides of the guide rail 5, or the first rail frame 17 is arranged on either one of the front and rear sides of the guide rail 5. The second rail frame 18 can be disposed on the other side.

  In the above-described embodiment, the case where the folding door is a single-opening door has been described. However, the assist device of the present invention can be applied to a double-opening folding door that can be opened both front and rear. Further, the assist device of the present invention can be applied to a three-fold folding door constituted by a first door panel 1 having a large lateral width and a second door panel 2 and a third door panel having a small lateral width.

  As a braking structure, a known gas damper, oil damper, or the like may be used as a braking element, and is not limited to a structure using the air cylinder 23 as a braking element. The braking timing of the braking structure may be before the second spring 22 is separated from the second spring holding body 59 or after it is separated. If necessary, a rod holder for attracting and holding the piston rod 25 can be provided, and a third magnet for attracting the rod holder can be added to the tip of the piston rod 25. The tension of the second spring 22 does not need to be set larger than the tension of the first spring 21, and can be set equal to or smaller than the tension of the first spring 21 depending on the tension characteristic of the first spring 21. . The first spring 21 and the second spring 22 can be constituted by compression coil springs. In this case, the first door panel 1 is closed from the middle of opening by the tension of the first spring 21 and the second spring 22, Or open operation.

DESCRIPTION OF SYMBOLS 1 1st door panel 2 2nd door panel 5 Guide rail 6 Runner 14 Opening frame 15 Guide frame 17 1st rail frame 18 2nd rail frame 21 1st spring 22 2nd spring 23 Air cylinder 29 Base end block 30 End block 31 Slide block 56 1st magnet 57 2nd magnet 58 1st spring holding body 59 2nd spring holding body 60 Switching tool

Claims (8)

A plurality of door panels (1, 2) are connected to each other so that they can be folded and opened, and the first door panel (1) arranged on the closed end side is guided by a guide rail (5) through a runner (6). A door assist device,
A first support structure including a coil-shaped first spring (21) in which the assist device moves and operates the first door panel (1) from an intermediate part of the opening / closing stroke of the first door panel (1) toward the moving end; ,
A coil-shaped second spring (22) that operates to move the first door panel (1) toward the moving end in cooperation with the first spring (21) from the middle of the expansion / contraction stroke of the first spring (21). A second support structure provided;
Accompanying the runner (6), the states of the first support structure and the second support structure are switched, and the first spring (21) and the second spring (22) are stored in the stored state, or the first stored in the stored state. A switching tool (60) for bringing the first spring (21) and the second spring (22) into an output state;
It is arranged on the moving end side of the first door panel (1), and is composed of a braking structure that brakes the movement of the runner (6) to the moving end,
In the first support structure, the first spring (21), the slide block (31) fixed to the output end of the spring (21), the first magnet (56), and the first spring (21) are stored. And a first spring holder (58) that magnetically attracts the first magnet (56)
In the second support structure, the second spring (22), the end block (30) fixed to the output end of the spring (22), the second magnet (57), and the second spring (22) are stored. And a second spring holder (59) that magnetically attracts the second magnet (57)
These first support structure, second support structure, and braking structure are accommodated in a guide frame (15) arranged in parallel with the guide rail (5),
The guide frame (15) includes a first rail frame (17) and a second rail frame (18) that are adjacent to each other in the front-rear direction, and a partition wall (20) that divides both rail frames (17, 18) in the front-rear direction. And
The first support structure and the air cylinder (23) constituting the braking structure are arranged on the first rail frame (17), and the second support structure is arranged on the second rail frame (18),
The first door panel (1) is moved from a predetermined open position toward the moving end by the biasing force of the first spring (21), and the biasing force of the second spring (22) is moved during the movement of the first door panel (1). In addition, the folding door assist device is configured to move the first door panel (1) to the moving end while braking the movement with the braking structure. With the transition of the runner (6) in the guide rail (5), the switching tool (60) is configured to shift in the guide frame (15),
In the guide frame (15), the first spring holder (58) is arranged in the middle of the moving stroke of the switching tool (60) accompanying the folding opening / closing operation of the first door panel (1),
The assist device for a folding door according to claim 1 , wherein the second spring holder (59) is disposed closer to the moving end than the first spring holder (58) in the guide frame (15) . The tension of the second spring (22) is set larger than the tension of the first spring (21),
The assisting of the folding door according to claim 1 or 2, wherein the closing stroke of the second spring (22) is set within a range of [1/2] to [1/4] of the closing stroke of the first spring (21). apparatus. When the first door panel (1) is in the open position inclined about 30 degrees with respect to the longitudinal line of the guide frame (15), the switching tool (60) can be attached to and detached from the second magnet (57). A second spring retainer (59) is disposed;
When the first door panel (1) is in the open position inclined about 45 degrees with respect to the longitudinal direction line of the guide frame (15), the switching tool (60) can be attached to and detached from the first magnet (56). The folding door assist device according to any one of claims 1 to 3, wherein a first spring holder (58) is arranged. A proximal block (29) is fixed near the closed ends of the first rail frame (17) and the second rail frame (18),
A first spring (21) and an air cylinder (23) are arranged between the slide block (31) and the base end block (29) housed in the first rail frame (17) so as to be adjacent to each other in the vertical direction. And
The assist device for a folding door according to claim 1 , wherein a second spring (22) is disposed between the end block (30) and the base end block (29) accommodated in the second rail frame (18) . A plurality of door panels (1, 2) are connected to each other so that they can be folded and opened, and the first door panel (1) arranged on the closed end side is guided by a guide rail (5) through a runner (6). A door assist device,
The assist device includes a closing support device that supports the closing of the first door panel (1) from the middle of the opening / closing stroke of the first door panel (1) toward the closing end;
An opening support device for supporting opening of the first door panel (1) from the middle of the opening / closing stroke of the first door panel (1) toward the opening end;
The opening support device includes an opening support structure including a coil-shaped opening spring (72) that moves and operates the first door panel (1) from an intermediate part of the opening / closing stroke of the first door panel (1) toward the opening end.
A switching tool (60) that accompanies the runner (6) and switches the state of the opening support structure to place the opening spring (72) in the accumulating state or to put the opening spring (72) in the accumulating state into the output state. When,
It is arranged on the open end side of the first door panel (1), and is composed of a braking structure that brakes the movement of the runner (6) to the open end,
An assist device for a folding door, wherein the closing assist device is configured by the assist device according to any one of claims 1 to 5 . In the opening support structure, the opening spring (72), the slide block (77) fixed to the output end of the opening spring (72), the third magnet (91, 92), and the opening spring (72) are stored. The assist device for a folding door according to claim 6, comprising a third spring holder (96) that magnetically attracts the third magnet (91, 92) in a state . The guide frame (15) includes a first rail frame (17) and a second rail frame (18) adjacent to the front and rear, and a partition wall (20) for dividing the rail frames (17 and 18) in the front and rear directions. ,
An open end block (75) is fixed near the open ends of the first rail frame (17) and the second rail frame (18),
An opening device (72) and a damper (73) are arranged between the slide block (77) accommodated in both rail frames (17, 18) and the open end block (75), and the assist device is unitized. The folding door assist device according to claim 7 .

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