JP4413401B2 - Telescopic door - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a telescopic door body that is installed and used in an opening, such as a shutter.
[0002]
[Prior art]
As this kind of telescopic door body, the present inventor has already proposed Japanese Patent Application No. 11-158250, and according to this, the adjacent telescopic mechanisms are provided between the adjacent door body constituting bars, respectively. And a telescopic position restricting means for restricting individual expansion / contraction of the door-body-constituting bars and sequentially extending each of the adjacent door-body-constituting bars in the opening / closing direction at a predetermined position in the opening / closing direction. An opening / closing guide guide roller projecting on one side of the front and rear of the regulating member installed at the longitudinal end of each door body-forming bar, and the above-mentioned adjacent by pivotally supporting the opening / closing guide guide roller so as to be rotatable. Between the longitudinal ends of the door-body-constituting bars to be bent outwardly and projecting on the other side in the longitudinal direction so as to alternate with the guide rollers for opening and closing guides at the center of the longitudinal direction. A bending / extending link made up of a pair of link bars having a guide roller for music guidance and an opening / closing guide that is installed over the entire length in the opening / closing direction of the telescopic door body. One open / close guide, front and rear, a first rectilinear guide portion arranged in parallel to face the open / close guide, an inclined guide portion inclined from the tip to the outside, and the open / close guide spaced from the tip and in parallel A guide rail having a link guide provided with a second linear guide portion arranged, and the first linear guide portion guides the guide guide roller for extension and extension, thereby restraining the extension and extension link to extend and door. The above-described guide roller is guided by the tilting guide portion and the second straight guide portion by advancing the structural beam. The restraint of the extension link is released, the bending link is bent, and the door-body frame is made foldable. At this time, the pair of link bars in the extension / extraction link are, for example, the same length. Is done.
[0003]
[Problems to be solved by the invention]
In this case, the extendable door body constitutes a partition unit in which the door-body-constituting bar individually expands and contracts, and the partition unit moves in the open / close direction in the extended state, and the expansion / contraction position regulating means is in a predetermined position, for example, in the vertical direction. For items that open and close in the open direction, those that open and close in the horizontal direction are reduced sequentially at the opening side position, so that a person can be pinched when opening and closing the telescopic door body Therefore, it is possible to ensure safety, and to provide a telescopic door body such as a see-through vertical drawing or horizontal drawing shutter.
[0004]
However, in this case, when the telescopic door body is opened, the partition unit is smoothly reduced and thereby the telescopic door body is smoothly opened. There is a possibility that the smooth closing of the telescopic door body may be impaired in some cases, and improvement of this point is desired.
[0005]
The present invention has been made in view of such circumstances, and the problem to be solved is to improve the telescopic door body provided with the expansion / contraction position restricting means so that the opening and closing thereof are always smoothly performed. The object is to provide a telescopic door body that can be obtained.
[0006]
[Means for Solving the Problems]
In pursuit of the reason why it is impossible to always ensure smoothness at the time of opening, especially closing, the telescopic door body provided with the expansion / contraction position regulating means, the length of the pair of link bars in the bending / extending link is, for example, the same length As a result, when the guide roller for bending guide is positioned at the bent portion between the inclined guide portion and the second straight guide portion, the link bars on the adjacent side of each bent link in the adjacent door body constituting beam The link bar on the closing direction side of the isosceles side having the guide roller located at the bent portion by positioning the isosceles isosceles triangle with the end in the longitudinal direction of the door-body-constituting bar as a vertex. (In the pair of link bars of the bent link, the other link bar on the rear side in the opening direction, for example, the link bar on the upper side of the bent link in the case of opening and closing in the vertical direction) It becomes a hook-like shape between the ends of the door-body frame, and the movement of the door-body beam is hindered, and the smooth passage of the telescopic frame in the bent portion and the smooth closing of the telescopic door body are hindered. This is considered to be easy.
[0007]
Therefore, in the present invention, the link bars on the adjacent side in each of the bent links do not form a positional relationship of the isosceles of the isosceles triangle, and the following link bar on the closing direction side, that is, the one on the preceding side in the opening direction. The link bar (the link bar on the lower side of the bent link if it opens and closes in the vertical direction) is long, the link bar on the preceding side in the closing direction, that is, the other link bar on the rear side in the opening direction (the vertical bar above) For the one that opens and closes in the direction, the link bar on the upper side of the bent link) is made shorter so that the positional relationship of the unequal sides is established, and the length of the link bar on the preceding side in the opening direction is Bending guide projecting from the bending portion at the center in the longitudinal direction of the bending link as the length corresponding to the distance from the bending portion of the inclined guide portion and the second rectilinear guide portion to the end portion in the longitudinal direction of the door-body-constituting bar Guidero By positioning the bar at the bent portion, the door-body-constituting bar can be held in a stretched state, and the hook of the other link bar on the rear side is eliminated in the short opening direction, and the passage of the bent portion is promoted. The link bar on the long side according to the movement displacement of the end of the door-body constituting bar in the one link bar on the preceding side in the long opening direction so as to be pulled by the short link bar after passing through the link bar Is made to pass smoothly through the bent portion, and by repeating this operation, the telescopic door body can be smoothly opened and closed, in particular, closed, and the invention according to claim 1 is By installing an individual expansion / contraction mechanism between the door-body-constituting bars, the adjacent door-body-constituting bars can be individually expanded and contracted, and the individual door-body-constituting bars can be individually expanded and contracted in the opening / closing direction at a predetermined position. An expansion / contraction position restricting means for restricting to be performed sequentially toward each of the doors, and an opening / closing guide guide roller projecting on the front and rear sides of the expansion / contraction position restricting means installed at the longitudinal end of each door body constituting beam, By being pivotally supported coaxially with the guide roller for opening and closing the guide, it is interposed between the longitudinal end portions of the adjacent door body-forming bars so as to be able to bend outward and bend at the center in the longitudinal direction. And a bending / extending link consisting of a pair of link bars having a bending guide guide roller projecting on the other side in front and back so as to alternate with the above-mentioned opening / closing guide guide roller, and the entire length of the telescopic door body in the opening / closing direction. The front and rear opening / closing guide for linearly guiding the opening / closing guide roller between a front end and a predetermined position in the opening / closing direction, and a first rectilinear plan arranged parallel to the opening / closing guide. A guide rail having an inner side, an inclined guide portion inclined from the tip end toward the outside, and a link guide provided with a second straight guide portion arranged in parallel to be spaced from the tip end to the opening / closing guide; The bending / extension guides are guided by the first linear guide section to extend and restrain the bending / extension links, and the door-body-constituting bars are advanced. The bending guide guides are used in the inclined guide section and the second linear guide section. In a telescopic door body that releases the restraint of the bending / extending link by guiding a roller and flexing the bending / extending link to make the door-body-constituting frame collapsible, The length of the link bar is set to a length corresponding to the distance between the bent portion of the inclined guide portion and the second straight guide portion and the end in the longitudinal direction of the door-body-constituting bar. When the inner guide roller is located at the bent portion, the door-body-constituting bar can be held in a stretched manner and the length of the other link bar on the rear side in the opening direction is shorter than the one on the preceding side. The telescopic door body is characterized in that the pair of link bars of the bending / extending link have different lengths.
[0008]
In addition to the above, the invention according to claim 2 enables opening and closing of the fixed positions between the guide rails without twisting the door-body-constituting bars, and ensures more stable and smooth opening and closing of the telescopic door body. The opening / closing guide guide roller and the bending / stretching link are provided at both longitudinal ends of the adjacent door body constituting bars, and the guide rails are provided at both ends of the telescopic door body. The telescopic door body according to claim 1, wherein the telescopic position regulating means is provided on both sides of the telescopic door body.
[0009]
The present invention is a means for solving the above problems as the gist of the invention.
[0010]
The link bar on the preceding side in the opening direction and the link bar on the other side in the opening direction open and close the telescopic door body in the vertical direction, as shown in the parentheses above. The upper link bar and the latter can be called the lower link bar. When the telescopic door is opened and closed in the horizontal direction, for example, when it is a horizontal shutter, the former is the door-side link bar and the latter is the suspension-side link bar. It can be called a link bar.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the example of the drawings. A is an extendable door body, and the extendable door body A is provided with an individual extendable mechanism 2 between adjacent door body constituting bars 1. Extending / reducing position restricting means for restricting the adjacent door-body-constituting bars 1 to be individually extendable and retracted so as to sequentially perform individual expansion / contraction of the adjacent door-body-constituting bars 1 in the opening / closing direction at a predetermined position. 3 is provided.
[0012]
That is, the telescopic door body A of this example is made of, for example, aluminum and is see-through configured for vertical pulling so that it is housed by being folded from the opening to the upper housing 6 and stored in the vertical direction (vertical direction). This is a vertical shutter that opens and closes and opens and closes, and a large number of door-body-constituting bars 1 are arranged in parallel in the opening-and-closing direction. Individual expansion and contraction is possible for each of the adjacent door body constituting bars 1.
[0013]
In the present example, the above-mentioned many door-body-constituting bars 1 are formed so as to form a horizontally long frame in which a pair of parallel bars are used at the front and rear, and both longitudinal ends thereof are connected by, for example, an inverted T-shaped connecting member 11. The individual telescopic mechanism 2 is configured such that the door-body-constituting bars 1 formed by these frames are connected in the opening / closing direction. In this example, the individual telescopic mechanism 2 is connected to the adjacent door-body-constituting bars 1 respectively. Is arranged so that it can be extended and retracted by, for example, a combination of a straight line, a curved line, etc. For example, an X-shaped link or a single bar link is used, and a plurality or a plurality of the individual expansion / contraction mechanisms 2 are arranged in the longitudinal direction of the adjacent door-body-constituting bars 1 and adjacent to each other. Individual expansion and contraction of the door body structure crosspiece 1 are configured to stably performed.
[0014]
At this time, the individual telescopic mechanism 2 of the X-shaped link is such that each end of the link bar is pivotally fixed to the adjacent door body constituting bar 1 and each other end is adjacent to the adjacent door body structure. Each of the bars 1 is slidably engaged with a slide groove via a roller, and is pivotally supported at an intersection if necessary. The other end is engaged with the slide groove of the other door-body-forming bar 1 in a similar manner through a roller.
[0015]
The expansion / contraction position restricting means 3 is rotated on the same axis as the open / close guide guide roller 31 and the open / close guide guide roller 31 projecting from the front / rear side installed at the longitudinal end of each door body constituting bar 1. By being pivotally supported, it is interposed between the longitudinal end portions of the adjacent door-body-constituting bars 1 so as to be able to bend outward, and the opening / closing guide guide roller 31 and the front / rear guide portion are bent at the center in the longitudinal direction. A bending / stretching link 32 having a pair of link bars 33 having bending guide guide rollers 34 projecting on the other side in the front and rear direction so as to alternate with each other, and installed so as to extend over the entire length in the opening and closing direction, from the opening and closing direction to a predetermined position. The first open / close guide 51 and the first open / close guide 51 arranged in parallel to face the open / close guide 51, and the outer side from the front end thereof. And a guide rail 5 having a link guide 52 provided with a second guide guide portion 55 provided in parallel to be spaced apart from the opening / closing guide 51 and parallel to the opening / closing guide 51 from the tip thereof. By guiding the bending / extension guide guide roller 34 in the first rectilinear guide section 53, the bending / extension link 32 is stretched and restrained to advance the door body constituting beam 1, and the inclined guide section 54 and the second rectilinear guide section 55 are advanced. In this case, the bending / extension link 32 is released by guiding the bending / extension guiding guide roller 34, and the bending / extension link 32 is bent so that the door-body-constituting bar 1 can be folded.
[0016]
In this example, the guide roller 31 for opening and closing guides projects a connecting shaft 11 connecting both ends in the longitudinal direction of the door-body-constituting bar 1 by the frame to the guide rail 5 side, and an intermediate position in the width direction of the connecting shaft 11 These are pivotally fixed to each other.
[0017]
The bending / extending link 32 uses a link bar 33 having a pair of different lengths as will be described later in a pair so as to have a length that coincides with the interval between the adjacent door-body-constituting bars 1 by being extended in series. The end of the bar 33 on the side of the door-body-constituting bar 1 is pivotally supported coaxially and pivotally on the distal end side with respect to the connecting shaft 11 that pivotally supports the opening / closing guide guide roller 31. The other end of the guide shaft is pivotably supported with respect to each other, and the bending guide guide roller 34 is pivotally fixed to the pivot support portion so as to alternate with the opening / closing guide guide roller 31. In addition, it is interposed between both longitudinal ends of the adjacent door-body-constituting bars 1 so that they can be bent in the front-rear direction.
[0018]
The guide rail 5 is provided with an open / close guide 51 and a link guide 52 on the front and rear facing surfaces on the inner side thereof, and guides alternately the open / close guide guide rollers 31 and the bending guide guides 34 respectively. At this time, the opening / closing guide 51 is installed inside the front / rear / rear side of the guide rail 5 so as to have a C-shaped cross section over its entire length, and guides the opening / closing guide roller 31 to expand and contract. While the door body A is opened / closed, the link guide 52 has a width equal to that of the opening / closing guide 51 so as to be the same length as the opening / closing guide 51 inside the guide rail 5 and inside the front and rear. The guide roller 34 for bending / extension guidance is also installed at a position displaced in the direction so as to have a C-shaped cross section, and the opening / closing guide 51 guides the opening / closing. In combination with the guide guide roller 34, the expansion / contraction link 32 is restrained to extend straightly, and the restriction is released to restrict the expansion / contraction door body A. At this time, the link guide 52 A first position parallel to the rear side in the width direction of the opening / closing guide 51 between a predetermined position from the front end in the opening direction, that is, in this example, from the lower end position of the opening surface to the upper end position of the opening surface in the vicinity of the storage portion 6. A rectilinear guide portion 53 and an inclined guide portion that inclines and branches from the extension line of the first rectilinear guide portion 53 at the upper end position of the opening surface at the predetermined position and moves forward and backward, in this example, toward the front of the telescopic door body A. 54 and the second rectilinear guide portion 55 in the storage portion 6 parallel to the opening / closing guide 51 from the tilt guide portion 54, and the first and second rectilinear guide portions 53, 55 via the tilt guide portion 54. Forward and backward Place to some as having been placed.
[0019]
In the expansion / contraction position restricting means 3 including the bending / extending link 32 and the guide rail 5 configured as described above, the bending / extending link 32 has the length of the link bar 33 on the preceding side in the opening direction of the pair, and the inclination The length of the guide portion 54 and the second straight guide portion 55 is set to a length corresponding to the distance between the end portions in the longitudinal direction of the door-body-constituting bar 1, and the guide member 34 for bending guide is positioned at the bent portion. The pair of link bars 33 of the bent and extended links 32 are configured so that the crosspiece 1 can be held in a stretched manner and the length of the other link bar 33 on the rear side is shorter than the one link bar 33 on the front side in the opening direction. As a different length.
[0020]
That is, the bending link 32 is longer in the opening direction than one link bar on the preceding side, that is, the upper link bar 33, and longer in the opening direction than the other link bar on the subsequent side, that is, the lower link bar 33. The upper link bar 33 is made to have a different length by about 10%, so that the guide roller 34 has a fixed shaft hole center of 87 mm) and the latter is 94 mm (also 78 mm in the center). Depending on the distance from the bent part between the inclined guide part 54 and the second straight guide part to the longitudinal end of the door-body-constituting bar, in this example, the connecting member 11. When the guide roller 34 for bending guide is positioned at the bent portion, the length of the bent guide roller 34 is extended between the bent portion and the longitudinal end portion of the door-body-constituting bar 1. In this example, the length of the lower link bar 33 on the other side of the rear side in the opening direction is shortened by about 10% as described above. Therefore, the lower link bar 33 can be moved along the inclined guide portion 54 when the upper link bar 33 is stretched. In this example, the lower link bar 33 can move downward. It is supposed to be.
[0021]
Therefore, when the telescopic door body A is opened / closed by the telescopic position restricting means 3 of this example, the bending / extension link 32 is stretched and restrained by guiding the bending / extension guiding guide roller 34 in the first rectilinear guide 53, thereby The individual telescopic mechanism 2 is set in the extended state and restrained in this state, and the door-body-constituting bar 1, that is, the telescopic door body A is allowed to advance in the opening direction and the closing direction in the extended state. By guiding the bending / extension guiding guide roller 34 in the guide section 55, the bending / extension link 32 is released by releasing the restraint of the bending / extension link 32, thereby releasing the extension state and allowing the individual expansion / contraction mechanism 2 to contract. In this state, the door-body-constituting bar 1, that is, the telescopic door body A is made foldable.
[0022]
At this time, the bending / stretching link 32 increases the length of the upper link bar 33 of the pair of link bars 33, shortens the length of the lower link bar 33, and connects the pair of link bars 33 to the above-mentioned link bar 33. Due to the different lengths, the link bars 33 on the adjacent side of the bent link 32 do not form an isosceles positional relationship between the isosceles triangles. Since the lower short link bar 33 can be smoothly passed through the bent portion as the door body structural bar 1 descends by being positioned at the bent portion between the two straight guide portions, the upper link bar 33 makes it possible to hold the door-body-constituting bar 1 in a stretched state, eliminates the catch of the lower link bar 33, promotes the passage of the bent portion, The upper link bar 33 is displaced downward so that the upper link bar 33 is pulled downward, and the upper link bar 33 is bent in accordance with the downward movement displacement of the end of the door-body-constituting bar 1 accompanying this. By passing through the portion and repeating this, the telescopic door body A is smoothly opened and closed, in particular, closed.
[0023]
In the figure, reference numeral 12 denotes an L-shaped storage that can be bent and stored in the direction intersecting with the opening surface by bending the guide rail in the direction intersecting with the opening surface, for example, by forming a side L shape in the longitudinal shutter. By using the telescopic door body A that can be shared with the telescopic door body, the cross body members can be rotated on the indoor side or the outdoor side so that the pair of cross members are integrated to form the door body structural rail 1. The connected hinge 61 supports the telescopic door body A on an upper frame (not shown) installed between the guide rails 5 so that the telescopic door body A can be housed in the housing portion 6 and lowers it to a fixed position. The telescopic link 62 is a shutter case installed at the upper end of the guide rail 5 so as to cover the back side of the storage unit 6, and 7 is opened and closed by fixing one end to the end slat at the lower end and hanging the telescopic door body Yong Hanging wire was fixed at the other end to the winding shaft 71 of, 72 denotes a pulley for turning of the wire 7.
[0024]
The illustrated example is as described above. Instead of the above-described vertical shutter, the telescopic door body is a horizontal shutter that can be opened and closed in the left-right direction (width direction). The telescopic door body and the guide rail and their relationship are tilted so as to rotate 90 degrees, and the guide rail is positioned up and down, and the telescopic door body is hung up and down to open and close in the horizontal direction. When using a telescopic door body for pulling, an extension / contraction link is installed on the upper end side of the adjacent door body structural bar, and an expansion / contraction position restricting means is installed between the upper guide rail, and the lower guide rail opens the door. The expansion and contraction of the extendable door body is restricted by the extension position restricting means on one side in the longitudinal direction of the door structure beam so that the steadying roller installed at the lower end of the body structure beam is guided. The door frame is replaced by a single frame, and the individual telescopic mechanism is fixed to the adjacent door frame in such a way that one end is freely rotatable. Or a plurality of link bars that are slidably engaged with each other, and an X-shaped telescopic link with an intermediate connection part that includes an intermediate connection part that rotatably fixes the other end of each link bar. In this case, by dividing the intermediate connecting portion into two parts and hinge-connecting at the divided portions, etc., the individual expansion / contraction mechanism is configured to be foldable in the crossing direction of the opening surface between the adjacent door body constituting beams, and The guide rail is formed in an L-shape from the opening surface in the crossing direction, and the link guide portion, particularly the inclined guide portion or the second straight guide portion is arranged from the vicinity of the end of the opening surface in the crossing direction. To open the telescopic door. In implementing the present invention, the telescopic door body, the door body, and the like are constructed so as to expand and contract in the vicinity of the end of the surface so as to be retractable in the crossing direction, and to electrically open and close the telescopic door body. Each material, shape, structure, etc. of construction bar, individual expansion / contraction mechanism, expansion / contraction position regulating means, guide roller for opening / closing guide, bending / extension link, link bar, guide roller for bending / extension guide, guide rail, opening / closing guide, link guide, etc. As long as it does not contradict the gist of the present invention, the relationship, addition to these, and the like can be in various forms.
[0025]
【The invention's effect】
Since the present invention is configured as described above, the invention according to claim 1 is an improvement of the telescopic door body provided with the expansion / contraction position restricting means, and the link bars on the adjacent side in the bent link are the isosceles triangles. Without making the positional relationship of the isosceles side, the following link bar is made longer in the closing direction and the preceding link bar is made shorter in the closing direction to make the positional relationship of the unequal side and the opening. The length of the link bar on the preceding side in the direction is defined as the length corresponding to the distance from the bent portion of the inclined guide part and the second straight guide part in the link guide to the longitudinal end of the door body constituting beam, A guide roller for guiding the guide projecting at the bent portion in the center in the longitudinal direction of the bent link is positioned at the bent portion, so that the door-body-constituting bar can be held in a stretched shape. Link bar pull The end of the door-body-constituting bar in the one link bar on the preceding side in the long open direction so that it is pulled after the short link bar is passed, and the hook is eliminated. Provided is an extendable door body in which both the opening and closing of the long link bar can pass smoothly through the bent portion in accordance with the movement displacement, and the opening and closing can be performed smoothly. be able to.
[0026]
In addition to the above, the invention according to claim 2 enables opening and closing of the fixed positions between the guide rails without twisting the door-body-constituting bars, and ensures more stable and smooth opening and closing of the telescopic door body. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a front view of a telescopic door body.
FIG. 2 is a longitudinal sectional view of an extendable door body.
FIG. 3 is a partial longitudinal sectional view showing a folded state of the telescopic door body.
FIG. 4 is an enlarged longitudinal sectional view showing a relationship between a bending / extending link and a link guide.
FIG. 5 is a partial cross-sectional view showing a contracted state of the telescopic door body.
[Explanation of symbols]
A telescopic door body 1 door body constituting bar 2 individual telescopic mechanism 3 telescopic position restricting means 31 opening / closing guide guide roller 32 bending link 33 link bar 34 bending guide roller 5 guide rail 51 opening / closing guide 52 link guide 53 first linear guide Part 54 inclined guide part 55 second straight ahead guide part

Claims (2)

By installing an individual telescopic mechanism between the adjacent door-body-constituting bars, the adjacent door-body-constituting bars can be individually expanded and contracted, and the individual expansion-contraction of the adjacent door-body-constituting bars can be opened and closed at a predetermined position. An expansion / contraction position restricting means for restricting to be performed sequentially toward each of the doors, and an opening / closing guide guide roller projecting from the front / rear side installed at the longitudinal end of each door member constituting beam , By being pivotally supported coaxially with the guide roller for opening / closing guidance, it is interposed between the longitudinal end portions of the adjacent door body constituting bars so as to be bent outward and bent at the center in the longitudinal direction. A bending / extending link composed of a pair of link bars having a guide roller for bending guidance projecting on the other side in the front and back so as to alternate with the above-mentioned opening / closing guide guide roller on the part, and extending over the entire length in the opening / closing direction The front / rear opening / closing guide for linearly guiding the opening / closing guide roller between the front end of the opening / closing direction and a predetermined position, and a first rectilinear guide portion arranged in parallel to face the opening / closing guide, from the front end thereof A guide rail having an inclined guide portion inclined toward the outside and a link guide provided with a second linear guide portion arranged in parallel to be spaced apart from the opening and closing guide from the tip thereof, and the first straight guide Guiding the bending / extension guide guide roller at the section to elongate and restrain the bending / extension link to advance the door-body-constituting bar, and guiding the bending / extension guiding guide roller at the inclined guide section and the second linear guide section In the telescopic door body which releases the restraint of the above-mentioned bending-extension link by bending the bending-extension link so that the door-body-constituting bar can be folded, The length of the link bar on the first side in the opening direction of the pair of extension links is set to a length corresponding to the distance between the bent portion of the inclined guide portion and the second rectilinear guide portion and the end portion in the longitudinal direction of the door-body-constituting bar. , The bending guide guide roller is located at the bent portion, so that the door-body-constituting bar can be held in a stretched state, and the length of the other link bar on the rear side in the opening direction is shorter than the link bar on the preceding side. A telescopic door body characterized in that the length of the pair of link bars of the bending / extending link is different. The opening / closing guide guide roller and the bending / extending link are provided at both ends in the longitudinal direction of the adjacent door body constituting beam, and the guide rails are provided at both ends of the extendable door body so that the expansion / contraction position restricting means is connected to the expansion / contraction door body. The telescopic door body according to claim 1, which is provided on both sides of the door.

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