JP2006307521A - Sheet for sheet shutter and method of replacing lower portion of sheet of sheet shutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase work efficiency in replacing the lower portion of a sheet by replacing the lower portion of the sheet without fitting connection members to the sheet beforehand. <P>SOLUTION: The sheet shutter comprises the sheet 1 and a connected part 5 formed on the surface part of the sheet 1 and extending in the lateral direction of the sheet. The connected part 5 is connectable to a replacement sheet 10 and formed in such dimension and shape that do not obstruct the normal opening and closing of the sheet. The connected part 5 is connectable to the replacement sheet 10 through the connection members 6, 7, and 8. The connected part 5 comprises a bag-like part 50 extending in the lateral direction of the sheet and a shaft part 52 stored in the bag-like part 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a sheet shutter device, and more particularly, to a sheet that can be replaced only when the lower part of the sheet is broken, and a replacement method for a lower part of the sheet.

In some cases, a sheet shutter is provided to open and close an opening of a factory or a warehouse at high speed. In factories and warehouses, forklifts are used to unload luggage, but there are cases where a forklift accidentally comes into contact with a sheet and the sheet is torn.

Since it is not desirable in terms of work and cost to replace the entire sheet when the sheet is damaged, the sheet is configured in advance from the sheet body and the lower part of the sheet, and the lower end of the sheet body and the upper end of the lower part of the sheet are A connecting member (a joint rod formed from an aluminum mold) is used to be detachably connected. Specifically, Patent Document 1 discloses a shutter curtain configured to be vertically splitable via a joint portion, and the joint portion is an upper joint shaft provided at the lower end of the upper half of the shutter curtain. And a lower joint shaft provided at the upper end of the lower half of the shutter curtain, the upper joint shaft and the lower joint shaft are sandwiched from both sides by the front joint body and the back joint body, and the joint body on the front and back sides with rivets And the upper and lower joint shafts are fixed. The joint is located approximately 1500mm from the bottom of the shutter curtain where the shutter curtain is most damaged, and even if the shutter curtain is damaged due to a contact accident, there is no need to replace the set of curtains. Can only be exchanged.

However, depending on the use conditions of the sheet shutter, there is a case where partial replacement of the sheet is not necessary, and the joint portion provided in advance on the sheet may be over-spec for the end user. Although the joint part is formed in a shape and size that does not hinder the winding of the sheet, it will not go beyond that without the joint part. In addition, when replacing the seat, first, it is necessary to remove the rivet, remove the lower half of the curtain from the upper half of the curtain, and attach the lower curtain for replacement to the upper half of the curtain. To remove and install rivets, special tools such as rivets are required. Furthermore, when the front and back joints are integrated using rivets, the entire seat must be removed and the workability of seat replacement is poor. It was a thing. Further, since the joint shafts are connected by integrating the front and back joint portions with rivets, the joint shaft may come off from the joint portions due to a collision load. Another technical idea capable of exchanging only the lower part of the shutter curtain is disclosed in Patent Document 2. In this case, the sheet is previously provided with cooperation means (joint portion) for releasably linking the vertically divided sheets. As a means of cooperation, fasteners provided respectively at opposite edges of the divided upper and lower sheets are disclosed, but this also divides the sheet in advance and provides joints for the divided upper and lower sheets in the sheet in advance. There is no change.
JP2003-148065 JP 2000-5332 A

An object of the present invention is to make it possible to replace a lower portion of a sheet without attaching a connecting member to the sheet in advance.

Another object of the present invention is to improve the workability of exchanging the lower part of the seat.

The technical means adopted by the present invention in order to achieve the above-described problem comprises a sheet that opens and closes an opening, and a connected portion that is provided on the surface of the sheet and extends in the sheet width direction. A portion below the position where the connecting portion is provided constitutes a portion to be cut, and the connected portion can be connected to the replacement sheet and has a size and shape that does not hinder normal opening and closing of the seat.

In one preferable aspect, the said to-be-connected part can be connected with the said sheet | seat for replacement | exchange via a connection member. In one aspect, the connecting member includes an upper connecting member connected to the connected portion, a lower connecting member to which the replacement sheet is connected, and a fixing member, and the lower connecting member with respect to the upper connecting member. Is temporarily suspended, and the upper connecting member and the lower connecting member are fixed by inserting the fixing member into the space formed between the upper connecting member and the lower connecting member. In a preferred aspect, the connected portion has a bag-like portion extending in the sheet width direction and a shaft portion accommodated in the bag-like portion. In one aspect, the bag-like portion is attached to the surface portion of the sheet via the sheet portion. That is, the bag-like portion is short in the sheet height direction and provided on the leading end side of the sheet portion extending in the sheet width direction, and the base end side of the sheet portion is attached to the surface portion of the sheet. . Further, the bag-like portion may be directly attached to the surface portion of the sheet.

Another technical means adopted by the present invention is a method for replacing a sheet lower portion of a sheet shutter, wherein a connected portion extending in the sheet width direction is provided in advance on a surface portion of the sheet, and the connected portion Has a size and a shape that can be connected to a replacement sheet and does not hinder normal opening and closing of the seat, and the method includes connecting the connected portion to the sheet at a location close to the connected portion. And leaving the sheet in the horizontal direction and connecting the replacement sheet to the connected portion.

In one preferable aspect, the connecting step of the connected portion and the replacement sheet includes the step of suspending the lower connecting member to which the replacement sheet is connected to the upper connecting member connected to the connected portion; Fixing the upper connecting member and the lower connecting member by pushing the fixing member into a space formed between the member and the lower connecting member.

In the present invention, “size and shape that does not hinder normal opening and closing of the seat” means that the connected portion does not hinder the seat when the seat is raised or lowered to open and close the opening. It means that it is formed into a shape. “Hindering the opening and closing of the sheet” means that when the sheet cannot be raised or lowered itself, when using the take-up shaft, when the take-up of the sheet to the take-up shaft or the feeding of the sheet from the take-up shaft is hindered, the sheet Examples are cases where the seat is damaged or abnormal noise is generated when the seat is raised or lowered.

In the case where the connected portion is composed of a bag-shaped portion and a shaft portion accommodated in the bag-shaped portion, in one preferred embodiment, the shaft portion is provided in the bag-shaped portion in advance so that the shaft can be opened and closed even during normal opening and closing of the seat. The part is stored in the bag-like part, but when the sheet is normally opened and closed, only the bag-like part is provided so that the shaft part is not provided, and the connected part and the upper connecting member are connected before or after cutting the sheet. The shaft portion may be mounted in the bag-like portion before being connected. In this case, at least the portion of the connected portion (bag-like portion before storing the shaft portion) may have a size and shape that does not hinder normal opening and closing of the seat. Since the outer shape of the connected portion including the shaft portion is mainly determined by the bag-shaped portion, if the bag-shaped portion has a size and shape that does not hinder normal opening and closing of the seat, the connected portion is also It is considered that the size and shape do not hinder the opening and closing. Further, the “connected portion extending in the sheet width direction” does not necessarily mean one member corresponding to the entire sheet width, and the connected portion may be divided in the sheet width direction.

In the present invention, since the connecting member is used only when the lower part of the sheet needs to be replaced, it is not necessary to previously provide the connecting member on the sheet. Therefore, it is possible to provide a sheet that can replace the lower part of the sheet but does not have extra components. In addition, when replacing the lower part of the seat, it is not necessary to remove the previously attached connecting member, which was necessary in the past. In addition, since the connected portion is provided in advance in the sheet, it is not necessary to form the connected portion at the site when the lower part of the sheet must be replaced (for example, by welding the sheet, etc.) It is not necessary to form a bag-like part), and workability is good.

When the replacement seat is connected, the lower connection member is suspended from the upper connection member, and these connections are performed by the fitting means, so that operations such as removing the seat and tightening the rivet are not required. The workability when connecting the replacement sheet is good.

FIG. 1 is a front view of a sheet of a sheet shutter and a side view of the sheet (including a winding shaft). In the sheet 1 that opens and closes the opening, a plurality of aggregates 2 extending in the width direction of the sheet 1 are provided at intervals in the height direction. In the illustrated example, bag-like portions 3 extending in the sheet width direction are formed on the surface portion on the back side of the sheet 1 at intervals in the height direction, and the aggregate 2 is inserted into each bag-like portion 3. ing. The aggregate 2 at the lower end of the sheet 1 is housed in a bag-like portion 30, and the bag-like portion 30 is further housed in a bag-like bottom portion 300. The upper end of the sheet 1 is connected to the take-up shaft 4, and the take-up shaft 4 is rotated by an opening / closing machine so that the sheet 1 is wound around the take-up shaft 4 to open the opening and the sheet 1 is wound. It extends from the take-off shaft 4 and closes the opening. Usually, the winding shaft 4 is housed in a shutter case provided above the opening. Both ends in the width direction of the seat 1 are guided by guide rails installed on both sides of the opening. In FIG. 1, only the seat is shown, and the opening / closing machine, shutter case, and guide rail are not shown, but these configurations are well known.

In the surface portion of the sheet 1, a connected portion that is positioned below the second aggregate 2 from the bottom and extends in the sheet width direction so as to be connected to the sheet connecting portion of the upper connecting member 6 to be retrofitted. 5 is provided in advance. The part where the connected portion 5 is provided is determined in consideration of the height of the part where a seat damage accident may occur. In the example shown in the figure, the connected portion 5 is provided in the lower part of the second aggregate. However, the connected portion 5 depends on the place where the seat shutter is installed, the use conditions, or the conditions such as the interval of the aggregate. It goes without saying that the portion where the slab is provided is not limited to this. Further, in the illustrated example, the connected portion 5 is mounted on the surface portion on the back side of the sheet 1, but the connected portion may be mounted on the front surface portion of the sheet 1. In normal use, it is considered sufficient to provide one connected portion on one surface portion of the sheet 1, but the present invention provides a plurality of connected portions on the same surface or / and both surfaces of the sheet 1. It does not exclude what provides the part. Moreover, although the sheet | seat 1 provided with the aggregate 2 was shown, this invention is applied also to the sheet | seat which does not have an aggregate.

The connected portion 5 has an elongated bag-like portion 50 extending in the width direction of the sheet 1. As shown in FIG. 2, the connected portion 5 has a long sheet portion 51 that is short in the height direction of the sheet 1 and extends in the width direction of the sheet 1, and the upper end side of the sheet portion 51 is the sheet. 1, a bag-like portion 50 is formed on the lower end side of the sheet portion 51. In a preferred embodiment, the upper end side of the sheet portion 51 is welded and / or sewn to the sheet 1. In one preferred embodiment, the bag-like portion 50 is formed by folding a sheet having a desired vertical width and having a horizontal width extending in the width direction of the sheet in the vertical direction and welding or / and sewing. ing. In this case, as shown in the left diagram of FIG. 3 and FIG. 4, the sheet portion 51 is also doubled from the folded portion.

In one preferred embodiment, the shaft portion 52 is inserted in the bag-like portion 50 in advance, and both end portions in the length direction of the bag-like portion 50 are stapled 53 with the shaft portion 52 inserted into the bag-like portion 50. The shaft portion 52 is mounted in the bag-like portion 50 by sealing with a sealing means such as. In another aspect, only the bag-like portion 50 that does not have the shaft portion 52 may be provided in the sheet 1, and the shaft portion 52 may be inserted into the bag-like portion later (for example, when replacing the lower portion of the sheet). . In one preferred embodiment, the shaft portion 52 has a circular cross section, but the cross sectional shape of the shaft portion 52 is not limited to a circle. The shaft portion 52 may be a single longitudinal member that extends over the entire sheet width, or a plurality of longitudinal members that are divided in the longitudinal direction into the bag-like portion 50. Moreover, although the axial part 52 is formed from resin in one aspect | mode, the material which comprises the axial part 52 is not limited to resin.

When the lower part of the sheet 1 is damaged or torn, the sheet 1 is cut horizontally in the width direction at a part close to the connected portion 5. In one aspect, the sheet 1 is cut at a part as close as possible to the part to which the connected portion 5 and the sheet 1 are attached. In the figure, the cutting line is illustrated by C. The lower part B of the sheet 1 constitutes a portion to be cut that is removed from the upper part A, and the replacement sheet 10 having substantially the same configuration as the lower part B of the sheet 1 is used. After cutting the lower part B of the sheet 1, the bag-like part 50 and the shaft part 52 of the connected part 5 become the lower end part of the sheet 1, and the upper connecting member is connected to the bag-like part 50 and the shaft part 52 of the connected part 5. 6 are connected. If the shaft portion 52 is not inserted in the bag-like portion 50 in advance, the shaft portion 52 is inserted into the bag-like portion 50 before connecting the lower end portion of the sheet 1 to the upper connecting member 6. For example, both end portions in the length direction of the bag-like portion 50 are sealed with a sealing means such as a stapler 53.

The right view of FIG. 3 shows another embodiment of the connected portion 5, in which the bag-like portion 50 extending in the sheet width direction for inserting the shaft portion 52 is directly attached to the sheet 1. It is provided. The sheet 1 is cut horizontally along the cutting line C.

6 to 8 show a longitudinal connecting member extending in the seat width direction for exchanging the lower part of the seat. The longitudinal connecting members are the upper connecting member 6, the lower connecting member 7, and the fixing member 8. It consists of three members. The upper end portion of the upper connecting member 6 is connected to the connected portion 5 at the lower end portion of the sheet 1, and the lower end portion of the lower connecting member 7 is connected to the upper end portion of the replacement sheet 10. The lower connecting member 7 can be temporarily (temporarily) suspended from the front with respect to the upper connecting member 6, and the upper connecting member 6 is suspended on the upper connecting member 6. A sheet in which a lower part is cut by fixing the upper connecting member 6 and the lower connecting member 7 by pushing the fixing member 8 from the front into a space formed between the connecting member 6 and the lower connecting member 7. And the replacement sheet 10 are connected. In one preferred embodiment, each of the longitudinal connecting members 6, 7, and 8 is made of an aluminum mold, but the material of each connecting member is not limited to this.

FIG. 6 is a cross-sectional view of the upper connecting member 6, and a sheet connecting portion for connecting the connected portion 5 is formed on the upper portion of the upper connecting member 6. The sheet connecting portion has a substantially U-shaped cross-sectional view from the opposing side pieces 60, 61 and the bottom piece 62, and the upper ends of the opposing side pieces 60, 61 are bent in a direction close to each other. A groove 63 that opens upward is formed between the edges of the bent portion. The dimension of the groove part 63 is larger than the thickness of the sheet part 51 of the sheet 1 to the connected part 5 and smaller than the diameter of the shaft part 52 accommodated in the bag-like part 50 of the connected part 5. The space formed by the opposing side pieces 60 and 61 and the bottom piece 62 forms a bag-like portion 50 of the connected portion 5 and an accommodation space 64 of the shaft portion 52, and the length of the upper connecting member 6 is The bag-like part 50 and the shaft part 52 of the connected part 5 are slid in the sheet width direction from the end part and are accommodated in the accommodating space 64. An extension side piece 65 is formed by extending the lower end side of one side piece 60 downward, and a supporting piece 66 is provided in the middle of the extension side piece 65 so as to be opposed to the bottom piece 62. It is extended and formed. The support piece 66 is formed in a stepped shape, and a locking groove 660 is formed on the base end side (extension side piece 65 side). A fitting protrusion 620 is formed on the lower surface of the bottom piece 62 of the sheet connecting portion.

FIG. 7 is a cross-sectional view of the lower connecting member 7, and a lower portion of the lower connecting member 7 includes a connected portion (a bag-like portion 500 and a shaft portion 520 at the upper end portion of the replacement sheet 10. A sheet connecting portion is formed. A bag-like portion 500 is formed at the upper end portion of the replacement sheet 10, and a shaft portion 520 is accommodated in the bag-like portion 500. The sheet connecting portion has a substantially U-shaped cross-sectional view from the opposing side pieces 70 and 71 and the upper piece 72, and the lower ends of the opposing side pieces 70 and 71 are bent in a direction close to each other. A groove 73 that opens downward is formed between the edges of the bent portion. The dimension of the groove part 73 is larger than the thickness of the replacement sheet 10 and smaller than the diameter of the shaft part 520 accommodated in the bag-like part 500 of the connected part formed at the upper end part of the replacement sheet 10. Yes. The space formed by the opposing side pieces 70 and 71 and the upper piece 72 forms a bag-like portion 500 of the connected portion and an accommodating space 74 of the shaft portion 520, and the length direction of the lower connecting member 7 The bag-like part 500 and the shaft part 520 of the connected part are slid in the sheet width direction from the end of the sheet and are accommodated in the accommodation space 74. An extension side piece 75 is formed by extending the upper end side of one side piece 71 upward, and the upper end of the extension side piece 75 is spaced apart and opposed to the upper piece 72. Is formed to extend. A locking portion 760 is formed by bending the tip of the locking piece 76 downward, and a fitting projection 76 is formed on the upper surface of the locking piece 76.

FIG. 8 shows a fixing member, and the fixing member 8 has a substantially U shape in a sectional view from an upper piece 80, a lower piece 81, and a side piece 82 connecting the base end sides of the upper and lower pieces. Fitting recesses 800 and 810 are formed on the upper surface of the upper piece 80 and the lower surface of the lower piece 81, respectively, and inclined guide portions 801 and 811 are formed on the front end sides of the fitting recesses 800 and 810, respectively. ing. The height dimension of the fixing member 8 (the dimension between the upper surface of the upper piece 80 and the lower surface of the lower piece 81 is the bottom piece of the upper connecting member 6 when the lower connecting member 7 is temporarily suspended by the upper connecting member 6. The dimension between the lower surface of 62 and the upper surface of the locking piece 76 of the lower connecting member 7 is substantially the same. From the front, the lower surface of the bottom piece 62 of the upper connecting member 6 and the locking piece 76 of the lower connecting member 7 are viewed. The fixing member 8 can be fitted into a space between the upper surface of the fixing member 8. The upper piece 80 and the lower piece 81 of the fixing member 8 enter the space by the guide portions 801 and 811 at the distal ends. The fitting recesses 800 and 810 are fitted into the fitting protrusion 620 on the lower surface of the bottom piece 62 and the fitting protrusion 761 on the upper surface of the locking piece 76, respectively, so that the fixing member 8 is prevented from coming off, and The connecting members 6 and 7 are fixed.

FIG. 5 is a diagram illustrating a connecting portion after sheet replacement. The storage space 64 of the upper connecting member 6 stores the bag-like portion 50 and the shaft portion 52 of the connected portion 5, and the storage space 74 of the lower connecting member 7 is formed at the upper end of the replacement sheet 10. The bag-like portion 500 and the shaft portion 520 thus formed are accommodated. The upper connecting member 6 and the lower connecting member 7 are engaged by a support piece 66 of the upper connecting member 6 and a locking piece 76 of the lower connecting member 7. The fixing member 8 is pushed into a space formed between the upper surface of the locking piece 76 and the lower surface of the bottom piece 62 of the sheet connecting portion of the upper connecting member 6, and is formed on the upper surface of the upper piece 80 of the fixing member 8. The fitting receiving portion 800 and the fitting protrusion 620 formed on the lower surface of the bottom piece 62, the fitting receiving portion 810 formed on the lower surface of the lower piece 81 of the fixing member 8, and the upper surface of the locking piece 76 are formed. The engagement state is fixed by the fitting protrusions 761 fitting with each other. Further, the lower end portion 650 of the extending side piece 65 of the upper connecting member 6 is in contact with the upper portion of the side piece 70 of the lower connecting member 7. In FIG. 5, in a state where the three longitudinal connecting members 6, 7, 8 are fixed and integrated, the longitudinal connecting member is mounted in the left-right direction (longitudinal direction) by attaching lids 9 to the left and right ends of the sheet width direction. ) Is prevented. In one embodiment, the lid body 9 is fixed by the screw 90, but the lid body 9 may be fixed by other means, or the connecting piece may be prevented from being displaced by using means other than the lid body. Also good.

One or more of the longitudinal connecting members 6, 7, 8 may be divided in the longitudinal direction (sheet width direction). By dividing each member in the longitudinal direction, the connection between the connecting member and the sheet can be easily performed in a space-saving manner. In the case where the plurality of longitudinal connecting members 6, 7, and 8 are divided in the longitudinal direction, in one preferred embodiment, the longitudinal connecting members 6, 7, and 8 are preferably divided so as to be stepped in the height direction. By preventing the divided portions from continuing in the height direction, the strength of the entire sheet is prevented from being lowered even when the longitudinal connecting member is divided.

A method for replacing the sheet portion will be described. On the surface portion of the sheet 1, a connected portion 5 for connecting to a sheet connecting portion of an upper connecting member 6 attached later is provided in advance. During normal opening / closing of the seat, the connected portion 5 does not hinder the opening / closing operation. When the lower part of the sheet 1 is damaged, the sheet 1 is cut in the horizontal direction at the part C close to the connected portion 5 to remove the lower part of the sheet including the damaged part.

Next, the connected portion 5 positioned at the lower end of the sheet 1 and the sheet connecting portion of the upper connecting member 6 are connected. The two members are connected by sliding the bag-like portion 50 and the shaft portion 52 into the accommodating space 64 from the side of the upper connecting member 6. Since the connected portion 5 provided on the seat 1 is connected to a sheet connecting portion (bag structure) formed integrally from one member, the connected portion 5 and the sheet connecting portion of the upper connecting member 6 are connected to each other. Even when a collision load is applied, the opposing side pieces 60 and 61 are expanded, the groove 63 is expanded, and the connected portion 5 does not come out of the sheet connecting portion, and has sufficient sheet tensile strength. .

When the shaft portion 52 is not stored in the bag-like portion 50 in advance, the shaft portion 52 is connected to the bag-like portion before connecting the connected portion 5 and the upper connecting member 6 before or after cutting the sheet. Install in 50.

Next, the lower connecting member 7 to which the replacement sheet 10 is connected is suspended from the front by the upper connecting member 6. In the illustrated example, the lower connecting member 7 is temporarily suspended from the upper connecting member 6 by engaging the supporting piece 66 of the upper connecting member 6 so as to hook the locking piece 76 of the lower connecting member 7. Let In this state, the engaging portion 760 of the lower connecting member 7 is engaged with the engaging groove 660 of the support piece 66 of the upper connecting member 6, so that the lower connecting member 7 slides down from the upper connecting member 6. There is nothing. The replacement sheet 10 has substantially the same configuration as the lower part of the sheet that has been cut off and removed. Specifically, it has the same height dimension and width dimension as the lower part of the seat removed by cutting, and as shown in FIG. A bag-like bottom part is provided to house the bag-like part. Since the connected portion provided on the seat 10 is connected to the sheet connecting portion (bag structure) formed integrally from one member, it collides with the connected portion and the sheet connecting portion of the lower connecting member 7. Even when the load is applied, the opposing side pieces 70 and 71 are expanded, the groove 73 is expanded, and the connected portion does not come out of the sheet connecting portion, so that the sheet has sufficient sheet tensile strength.

Then, the upper connecting member 6 and the lower connecting member 7 are fixed by pushing the fixing member 8 into the space formed between the upper connecting member 6 and the lower connecting member 7 from the front, thereby fixing the upper connecting member 6 and the lower connecting member 7. The sheet 1 connected to 6 and the replacement sheet 10 connected to the lower connecting member 7 are integrated to form a sheet of a sheet shutter. Further, as necessary, a shift stop means is provided at both ends of the connecting members 6, 7, 8.

The present invention can be suitably used for a sheet shutter installed at a doorway of a factory or a warehouse.

It is the front view of the sheet | seat of a sheet | seat shutter, and the side view (a winding shaft is included) of the said sheet | seat. It is the fragmentary perspective view of the downward part of a sheet | seat, and the principal part enlarged view of a fragmentary perspective view. It is an enlarged side view of the principal part in FIG. It is the partial expanded front view and partial expanded side view of the bag-shaped part which comprise a to-be-connected part. It is sectional drawing which shows the connection structure after replacing | exchanging the sheet | seat lower part. It is sectional drawing of an upper side connection member. It is sectional drawing of a lower side connection member. It is sectional drawing of a fixing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet 5 Connected part 50 Bag-like part 51 Sheet part 52 Shaft part 6 Upper side connection member 7 Lower side connection member 8 Fixing member

Claims (8)

It consists of a sheet that opens and closes the opening, and a connected part that extends in the sheet width direction provided on the surface of the sheet, and the lower part of the sheet forms the part to be cut from the position where the connected part is provided The connected portion is connectable with a replacement sheet and has a size and shape that does not hinder normal opening and closing of the seat. The sheet for a sheet shutter according to claim 1, wherein the connected portion is connectable to the replacement sheet via a connecting member. The sheet for a sheet shutter according to claim 1, wherein the connected portion includes a bag-like portion extending in a sheet width direction and a shaft portion accommodated in the bag-like portion. The sheet for a sheet shutter according to claim 3, wherein the bag-like portion is attached to a surface portion of the sheet via a sheet portion. The sheet for a sheet shutter according to claim 3, wherein the bag-like portion is directly attached to a surface portion of the sheet. The connecting member includes an upper connecting member connected to the connected portion, a lower connecting member to which the replacement sheet is connected, and a fixing member, and the lower connecting member is suspended from the upper connecting member. 3. The sheet shutter according to claim 2, wherein the upper connecting member and the lower connecting member are fixed by pressing the fixing member into a space formed between the upper connecting member and the lower connecting member in a state where the upper connecting member and the lower connecting member are pressed. Sheet. A method for exchanging the lower part of the seat of the sheet shutter,
The surface portion of the sheet is provided with a connected portion extending in the sheet width direction. The connected portion can be connected to the replacement sheet and has a size and shape that does not hinder normal opening and closing of the seat. And
The method
Cutting the sheet in a horizontal direction so as to leave the connected portion on the sheet at a portion close to the connected portion;
Connecting a replacement sheet to the connected portion;
A method for replacing the lower part of the seat. The connecting process between the connected part and the replacement sheet is as follows:
Suspending the lower connecting member to which the replacement sheet is connected to the upper connecting member connected to the connected portion; and
Fixing the upper connecting member and the lower connecting member by pushing the fixing member into a space formed between the upper connecting member and the lower connecting member;
A method for replacing a portion of a sheet according to claim 7.

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