JP6231272B2 - Opening device - Google Patents

Description

The present invention relates to an opening device in which upper and lower shojis are accommodated in a frame, and at least the lower shoji can be opened and closed vertically, and in particular, the expected position of the lower shoji is maintained during a fire so that the shoji does not fall off the frame. The present invention relates to the opening device.

A raising / lowering window in which an upper and lower shoji is placed in a frame provided in a building opening and at least the lower shoji can be opened and closed is known as a kind of opening device. As for the raising and lowering windows, there is a difference in the expected direction position of the upper and lower shojis. In this case, the expected direction positions of the upper and lower shojis are always shifted regardless of the open / closed state of the lower shoji. It will be.

On the other hand, a raising / lowering window configured to be flush with the upper shoji when the lower shoji is closed is known. In this case, when opening the lower shoji, first lower the upper side to the indoor side centering on the lower side of the lower shoji, and then pull the lower shoji upward from that state to guide the lower shoji to the indoor side of the upper shoji The lower shoji can be opened upward. As such a raising / lowering window, there exists a thing as mentioned in patent document 1, for example.

JP 2012-1898 A

A guide groove is provided on the inner peripheral surface of the vertical frame in both the raising and lowering windows where the expected direction positions of the upper and lower shojis are different, and the raising and lowering window where the upper and lower shojis are flush with each other. Support members are provided on both side portions, and the lower shoji is suspended through the support member, and the support member is fitted into the guide groove, thereby restricting the expected direction of the lower shoji. The support member is mainly formed of a resin material in order to improve the slidability.

When a fire breaks out and the raised and lowered windows are exposed to high temperatures, the support member made of resin material melts, so that the expected direction of the lower shoji is not fully regulated, creating a gap between the frame and the shoji there is a possibility. For this reason, it was necessary to prevent this.

The present invention has been made in view of the above problems, and provides an opening device capable of maintaining regulation of the expected direction of the lower shoji so that no gap is generated between the lower shoji and the frame even in the event of a fire. With the goal.

In order to solve the above-described problem, an opening device according to the invention of claim 1 is configured such that an upper shoji and a lower shoji suspended by a balancer are placed in a frame, and the upper shoji and the lower shoji are respectively contained in a housing. In the opening device arranged to house the panel body, the lower shoji is arranged below the upper shoji in the closed state,
The lower frame constituting the frame body has an inner peripheral surface facing the lower surface of the lower shoji, and a recess is formed on one of the inner peripheral surface of the lower frame and the lower surface of the lower shoji, A protrusion is formed on the other of the inner peripheral surface of the frame and the lower surface of the lowering paper so as to face the recess.
Of the lower frame and the lower shoji, the concave and projecting portions are made of metal ,
The lower shoji is configured such that the recess and the protrusion are fitted only in the event of a fire .

According to the first aspect of the present invention, in the event of a fire, thermal expansion occurs in the casing material that constitutes the casing, so that the lower shoji and the lower frame approach each other and the concave portion and the projecting portion are fitted together, and the lower shoji is expected. It can be regulated not to move in the direction.

Moreover, the opening part apparatus which concerns on invention of Claim 2 WHEREIN: The said recessed part is formed in the lower surface of the said shoji,
The protrusion is formed on the inner peripheral surface of the lower frame.

According to the invention which concerns on Claim 2, the latching | locking part and recessed part for fixing the supporting member which supports a shoji on a vertical frame can be shared, and a structure can be simplified.

Further, the opening device according to the invention of claim 3 is characterized in that the lower shoji is arranged in the same plane as the upper shoji in a closed state.

According to the third aspect of the invention, the shoji paper moves in the expected direction as it opens and closes. Therefore, if the restraint state is lost during a fire, it tends to move in the expected direction. It is possible to prevent a gap between the body and the housing.

According to the opening device according to the present invention, it is possible to maintain the restriction of the expected direction of the shojiko even in the event of a fire, and to improve the fireproof performance by preventing a gap from being formed between the frame and the casing. it can.

It is the front view seen from the room inner side of the opening part device of this embodiment. It is the front view which decomposed | disassembled and represented roughly the frame which comprises the opening part apparatus of FIG. It is a longitudinal cross-sectional view of an opening part apparatus. It is a cross-sectional view of an opening device. It is the front view of a guide component, and the side view seen from the outdoor side. It is the side view seen from the inner peripheral side of the vertical frame which attached the guide components. It is an enlarged vertical sectional view of the lower part of the opening device. It is an expanded longitudinal cross-sectional view of the opening part apparatus lower part in the state at the time of fire outbreak. It is an enlarged horizontal cross-sectional view near the vertical frame in the state at the time of fire occurrence.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of the opening device of the present embodiment as viewed from the room side, and FIG. 2 is a front view schematically showing the frame body constituting the opening device of FIG. Show. The opening device of the present embodiment is configured as a raising and lowering window in which the upper and lower shojis 2 and 3 are housed in a frame 1 attached to a building opening, and the lower shoji 3 can be opened and closed freely. The upper shoji 2 has a fitting shape that cannot be opened and closed with respect to the frame 1.

The frame 1 is constituted by an upper frame 10, a lower frame 11, and left and right vertical frames 12, 12 that are rectangularly framed. Upper shoji 2 and lower shoji 3 have upper and lower eyelids 20 and 21 and left and right vertical hoists 22 and 2, respectively.
A panel body 5 made of a multi-layer glass plate is housed in a housing 4 formed by assembling 2 in a square shape. The upper collar 20 constituting the lower shoji 3 is provided with a pulling portion 20a for opening and closing the lower shoji 3 by hand. Locking devices 26 and 26 for locking the lower shoji 3 to the frame 1 are provided at both left and right ends of the pulling portion 20a.

As shown in FIG. 2, a balancer 23 is provided in the vertical frame 12, support members 25 are provided at both ends of the lower end of the lower shoji 3, and both are connected by a wire 24. That is, the lower shoji 3 is suspended by the balancer 23. The balancer 23 is the same as that used for a normal raising / lowering window. For example, a spiral spring is provided in the balancer 23 to keep the mass of the lower shoji 3 in balance and move the lower shoji 3 up and down with a small force. It can be made to stop and can be stopped at an arbitrary position.

FIG. 3 is a longitudinal sectional view of the opening device, and FIG. 4 is a transverse sectional view of the opening device. FIG. 4 is a cross-sectional view of a portion where the upper shoji 2 is arranged on the right side in the drawing, and a cross-sectional view of a portion where the lower shoji 3 is arranged on the left side of the drawing. As for the upper frame 10 which comprises the frame 1, the indoor side exposed part of the metal upper frame 10a is covered with the resin upper frame 10b. The upper frame 10 is formed with a concave portion 10 c that houses the upper end portion of the upper shoji 2, and the outdoor side wall of the concave portion 10 c is an outdoor facing surface portion that opposes the outdoor outer surface of the upper collar 20 that constitutes the upper shoji 2. 10d. The position of the outdoor facing surface portion 10d in the direction of finding the inner edge of the upper frame 20 is substantially the same as the position of the inner edge of the upper eyelid 20 in the direction of finding. By 10d, it is a state hidden from the outdoor side.

The outdoor facing surface portion 10d of the upper frame 10 has an airtight material 10 at the inner end portion in the finding direction on the side facing the indoor side.
e is held along the longitudinal direction. The airtight member 10 e abuts against the outdoor side surface of the upper collar 20 that constitutes the upper shoji 2, and ensures airtightness on the upper side of the upper shoji 2. On the outdoor facing surface portion 10d, a heating foam material 10f is arranged along the longitudinal direction at a position outside the airtight material 10e in the direction of finding. The heating foam material 10f is opposed to the upper collar 20 of the upper screen 2. The upper frame 1
In the 0 concave portion 10c, the heating foam material 10k is also disposed on the bottom wall and the indoor side wall.

The upper frame 10 has a planar indoor inner peripheral portion 10g formed by the resin upper frame 10b on the indoor side of the concave portion 10c. The position of the indoor inner periphery 10g in the direction of finding is substantially the same as the position of the upper end 20 of the upper arm 20 in the upper direction of the upper shoji 2 and the upper arm 20 of the upper shoji 2 is located in the upper frame 10.
The indoor inner peripheral portion 10g of the indoor space is hidden when viewed from the indoor side. An angle portion 13 extending toward the indoor side is formed at the indoor end portion of the indoor inner peripheral portion 10g of the upper frame 10.

As for the lower frame 11 which comprises the frame 1, the indoor side exposed part of the metal lower frame 11a is covered with the resin lower frame 11b. The lower frame 11 is formed with a concave portion 11 c that houses the lower end portion of the lower shoji 3, and the outdoor side wall of the concave portion 11 c is an outdoor facing surface portion that opposes the outer outer surface of the lower eyelid 21 constituting the lower shiji 3. 11d. The position of the outdoor facing surface portion 11d in the direction of finding the inner edge of the lower direction 21 is substantially the same as the position of the inner edge of the lower direction of the lower eyelid 21. By 11d, it is a state hidden from the outdoor side.

The outdoor facing surface portion 11d of the lower frame 11 has an airtight material 11 at the inner end portion in the direction of finding on the side facing the indoor side.
e is held along the longitudinal direction. The airtight member 11 e abuts against the outdoor side surface of the lower arm 21 constituting the lower shoji 3 to ensure airtightness at the lower side of the lower shoji 3. On the outdoor facing surface portion 11d, a heating foam material 11f is disposed along the longitudinal direction at a position outside the airtight material 11e in the direction of finding. The heating foam material 11 f faces the lower arm 21 of the lower door 3. The bottom frame 11
A hollow portion 11h is provided below the concave portion 11c for drainage.

The lower frame 11 has a planar indoor inner peripheral portion 11g formed by the resin lower frame 11b on the indoor side of the concave portion 11c. The position of the indoor inner peripheral portion 11g in the direction of finding is substantially the same as the position of the lower end of the lower arm 21 of the lower shoji 3 in the direction of finding the lower arm 21.
The indoor inner peripheral part 11g is hidden from the indoor side. An angle portion 13 extending toward the indoor side is formed at the indoor end portion of the indoor inner peripheral portion 11g of the lower frame 11.

As for the vertical frame 12 which comprises the frame 1, the indoor side exposed part of the metal vertical frame 12a is covered with the resin vertical frame 12b. The vertical frame 12 has a concave vertical guide groove 12 that guides both ends of the lower shoji 3 in the vertical direction.
c is formed along the longitudinal direction. An angle portion 13 extending toward the indoor side is formed on the indoor side of the vertical guide groove 12c.

An outdoor facing surface portion 12 d is formed at the outdoor end of the vertical frame 12 so as to face the outdoor side surface of the vertical rod 23 constituting the upper and lower shojis 2 and 3. The position of the outdoor facing surface portion 12d in the direction of finding the inner end of the vertical direction is substantially the same as the position of the vertical direction of the vertical rod 23, and the vertical rod 23 is located from the outdoor side by the outdoor facing surface portion 12d of the vertical frame 12. It is in a hidden state.

The outdoor facing surface portion 12d of the vertical frame 12 has an airtight material 12 at the inner end portion in the direction of finding on the side facing the indoor side.
e is held along the longitudinal direction. The airtight material 12e abuts against the outdoor side surface of the vertical rod 23 and ensures airtightness in the vertical sides of the upper and lower shojis 2 and 3. On the outdoor facing surface portion 12d, a heating foam material 12f is arranged along the longitudinal direction at a position outside the airtight material 12e in the direction of finding. The heating foam material 12f is opposed to the vertical rod 23 of the upper shoji 2 and the lower shoji 3. Vertical frame 12
In addition, the heating foam material 12k is also disposed on the inner peripheral surface opposite to the outer peripheral surface of the vertical rod 23.

In the present embodiment, the lower shoji 3 is arranged so as to be flush with the upper shoji 2 in the closed state. For this reason, the lower arm 21 of the upper shoji 2 and the upper arm 20 of the lower shoji 3 face each other in the closed state. Of these, the heating foam 21b is disposed on the outer peripheral surface 21a of the lower collar 21 of the upper shoji 2.

From the state in which the lower shoji 3 is closed, the lower shoji 3 can be inwardly tilted to a predetermined angle so that the upper side is inclined to the indoor side, and further, the lower shoji 3 is guided to the indoor side of the upper shoji 2 from that state. Can be moved up and down. In order to guide the lower shoji 3 in this way, a resin guide part 14 is provided at the lower end of the vertical frame 12, and a support member 25 provided at the lower end of the lower shoji 3 is slid on the guide part 14. .

FIG. 5 includes a front view of the guide component 14 (FIG. 5A) and a side view as seen from the outdoor side (FIG.
b)). The guide component 14 is formed in a block shape, and an oblique guide groove 14a formed in a groove shape capable of guiding a support member 25 provided at a lower end portion of the lower shoji 3 on the front surface, and the oblique guide. It has the groove | channel 14a and the vertical guide groove 14b which continues. The slant guide groove 14a is arranged so that the lower end of the lower shoji 3 is placed on the upper shoji 2 when the lower shoji 3 is turned inward.
Guide to the indoor side position. The vertical guide groove 14b guides the lower shoji 3 guided to the indoor side position of the upper shoji 2 in the vertical direction. The outdoor side surface 14c of the guide component 14 is formed in an inclined surface shape, and a heating foam material 20c is attached thereto.

In FIG. 6, the side view seen from the inner peripheral side of the vertical frame 12 which attached the guide component 14 is shown.
On the outdoor side of the vertical frame 12, the above-mentioned airtight material 12e is provided along the longitudinal direction. The position of the airtight material 12e is an airtight line with respect to the vertical sides of the upper and lower shojis 2 and 3. Also,
The heating foam material 12 f provided on the outdoor facing surface portion 12 d of the vertical frame 12 is provided in the same range as the airtight material 12 e in the longitudinal direction of the vertical frame 12.

On the inner peripheral surface of the vertical frame 12, a lock receiving component 12h is provided at an intermediate position in the vertical direction.
The lock receiving component 12h is linked with a lock device 26 provided on the upper collar 20 of the lower shoji 3, and can be locked so that the lower shoji 3 does not open by engaging a locking portion of the lock device 26. it can. The heating foams 12k provided on the inner peripheral surface of the vertical frame 12 are arranged along the longitudinal direction above and below the lock receiving component 12h, respectively.

The vertical guide groove 12 c formed on the inner peripheral surface of the vertical frame 12 is continuous with the vertical guide groove 14 b of the guide component 14 at the lower end portion. Thereby, the support member 25 of the lower shoji 3 is continuously guided up and down. The vertical guide groove 12c of the vertical frame 12 is provided with a stopper 12g at an intermediate position in the vertical direction. The stopper 12g is arranged so that the support member 25 contacts when the lower shoji 3 reaches the upper end position, and can restrict the movement range of the lower shoji 3.

FIG. 7 shows an enlarged vertical sectional view of the lower part of the opening device. Of the inner peripheral surface 11i of the lower frame 11, a protrusion 32 protruding in a fin shape is formed on the bottom wall constituting the concave portion 11c.
In addition, a recess 31 is formed on the lower surface of the lower collar 21 of the lower shoji 3 so as to face the protrusion 32. The recess 31 also has a function of holding and fixing the support members 25 provided at both ends of the lower shoji 3. The recess 31 and the protrusion 32 constitute a fitting structure 30 that can be freely fitted.

The fitting structures 30 are not fitted in a normal state, but are arranged so that they can be fitted to each other when a fire occurs. FIG. 8 shows an enlarged vertical sectional view of the lower part of the opening device in the state when a fire occurs. When a fire occurs and the opening device is exposed to a high temperature, each casing material constituting the casing 4 undergoes thermal elongation and warpage.

In the case 4 of the lower shoji 3, when receiving heat from the outdoor side, the lower eyelid 21 moves to the inner peripheral surface 11 i side of the lower frame 11 due to the thermal elongation of the vertical eyelid 23, and the lower eyelid 21 Warpage occurs so that the central portion in the longitudinal direction becomes convex toward the outdoor side. Moreover, since the resin component is used for the balancer 23 which supports the lower shoji 3, the resin component melts at the time of a fire, and the support state of the lower shoji 3 by the balancer 23 may not be maintained. In that case, since the lower shoji 3 falls in the frame 1, the lower eyelid 21 moves to the inner peripheral surface 11 i side of the lower frame 11 in any case. Furthermore, since the resin-made support member 25 is lost, the expectation direction restriction by the support member 25 on the lower side of the lower shoji 3 is also lost. As a result, the lower arm 21 of the lower shoji 3 tends to move downward and to the outside in the event of a fire.

As shown in FIG. 8, when the lower collar 21 of the lower shoji 3 moves downward, the recess 31 constituting the fitting structure 30 is fitted to the protrusion 32, and the lower collar 21 moves further to the outdoor side. It can be regulated not to. As a result, the expected position of the lower shoji 3 can be maintained, and the warp 21 can be prevented from warping, so that no gaps are formed between the lower shoji 3 and the frame 1, and heat and flames can be generated. It is possible to prevent penetration into the room.

Further, in the event of a fire, the heated foaming material provided in the frame 1, the upper shoji 2, and the lower shoji 3 expands and the volume expands, whereby the gap between the frame 1 and the upper shoji 2 or lower shoji 3. In addition, the gap between the upper shoji 2 and the lower shoji 3 can be closed, and the resin component can be brought closer to the indoor side to prevent ignition of the resin component.

Since the upper shoji 2 and the lower shoji 3 are configured to be arranged in the same plane in the closed state,
When thermal expansion occurs in the casing, each casing moves toward the inner peripheral surface of the frame 1 or moves so as to reduce the distance from the casing 4 facing up and down. For this reason, Shoji 2
Compared to a normal raising / lowering window in which the position of the lower door 3 and the lower shoji 3 is different in the expected direction position, the thermal expansion of the eaves acts so that the gap between the eaves 4 and the frame 1 becomes smaller. However, since not only thermal elongation but also deformation such as warpage occurs in the brazing material, it is difficult to completely suppress the generation of gaps.

On the other hand, in the present embodiment, as described above, the outdoor facing surface portions 10d, 11d, 1 of the frame 1
2d and 13d are provided with airtight materials 10e, 11e, 12e, and 13e, and the heating foam materials 10f, 11f, 12f, and 13f are arranged at positions outside the direction of finding in comparison with these. That is, for the upper and lower shojis 2 and 3, there are airtight lines on the outdoor side of these, and the heating foam is arranged toward the region on the indoor side of the airtight line.

When exposed to high temperatures from the outside of the room, the saddles constituting the upper and lower shojis 2 and 3 are deformed so as to move to the outside of the room, so that the airtight line is outside the upper and lower shojis 2 and 3. Thus, it is possible to prevent a gap from being generated between the frame body 1 and the frame body 1. Airtight line cannot be secured, frame 1
Even if a gap is generated between the outdoor facing surface portion 10d toward the indoor region,
Since the foamed heating materials 10f, 11f, 12f, and 13f provided in 11d, 12d, and 13d are foamed, a gap can be prevented from being generated.

Moreover, the heating foam material 10k provided on the inner peripheral surface of the upper frame 10 and the heating foam material 12k provided on the inner peripheral surface of the vertical frame 12 can more reliably secure the upper and lower shojis 2 and 3 to the frame. A gap between the body 1 and the body 1 can be closed.

Between the upper shoji 2 and the lower shoji 3, the heating foam 21b is provided on the outer peripheral surface 21a of the lower arm 21 constituting the upper shoji 2, so that the heating foam 21b is used for the lower shoji 3 in the event of a fire.
It foams toward the upper surface of the upper eyelid 20 and can close the gap between the upper shoji 2 and the lower shoji 3.
In the present embodiment, the heating foam material 21b is disposed on the lower heel 21 of the upper shoji 2; however, the upper foam 20 of the lower shoji 3 has a heating foam material on the outer peripheral surface facing the lower heel 21 of the upper shoji 2. It may be arranged.

As shown in FIG. 7, the heating foam material 11 f provided on the outdoor facing surface portion 11 d of the lower frame 11 is
It faces the support member 25 provided on the lower shoji 3. The support member 25 made of a resin material softens and falls off from the housing 4 in the event of a fire. Since the position of the support member 25 is close to the outdoor side, there is a possibility of ignition if it is in the same position. Further, the resin lower frame 11b is also softened, and if it is left as it is, the outdoor portion may ignite.

On the other hand, as shown in FIG. 8, in the event of a fire, the heated foam material 11f of the lower frame 11 greatly expands the volume from the outdoor facing surface portion 11d toward the indoor side, so the support member 25 and the resin lower frame 11b are expanded. Will be pushed out indoors. In FIG. 8, the resin material 40 by the support member 25 extruded to the indoor side and the resin lower frame 11b is schematically represented.

Since the lower frame 11 has a structure in which the indoor side is raised so as to hide the lower collar 21 of the lower shoji 3, the resin material 40 pushed out to the indoor side by the heating foam material 11f is attached to the metal lower frame 11a. It is located in the vicinity of the indoor end and can be made difficult to receive heat from the inside and outside of the room, thereby preventing ignition.

Further, the guide component 14 made of a resin material faces the heating foam material 12f provided on the outdoor facing surface portion 12d of the vertical frame 12, and the heating foam material 14d is also provided on the outdoor side surface 14c. Sometimes, the heating foams 12f and 14d are foamed and pressed against each other, so that the guide component 14 is pushed out indoors.

FIG. 9 shows an enlarged cross-sectional view of the vicinity of the vertical frame 12 in a state when a fire occurs. Vertical frame 1
2, the heated foam material 12 f on the outdoor facing surface portion 12 d and the heated foam material 12 k on the inner peripheral surface are foamed and expanded, and the heated foam material 14 d of the guide component 14 is also foamed and expanded.
Both the guide component 14 and the resin vertical frame 12 b are pushed out to the indoor side of the vertical frame 12. In FIG. 9, the resin material 41 by the guide component 14 and the resin vertical frame 12b extruded to the indoor side is represented typically.

Since the vertical guide groove 12c is formed in the vertical frame 12 on the indoor side, the resin material 41 pushed out to the indoor side is located in the vicinity of the indoor end of the metal vertical frame 12a, and heat from the outside of the room is generated. It can be made difficult to receive and can prevent ignition. Thus, the main resin parts used for the raising and lowering window are pushed out indoors by the opposed heating foam material.

The embodiment of the present invention has been described so far, but the application of the present invention is not limited to this embodiment, and can be variously applied within the scope of the technical idea. In the present embodiment, the present invention is applied to the raising and lowering window that is flush with the upper shoji 2 when the lower shoji 3 is closed. However, the lower shoji 3 is always arranged on the indoor side of the upper shoji 2 before and after closing. The present invention can be similarly applied to a normal raising / lowering window. In the fitting structure 30, the recess 31
And the protrusion 32 may be reversed, the recess 31 may be provided on the inner peripheral surface of the lower frame 11, and the protrusion 32 may be provided on the lower surface of the lower shoji 3.

DESCRIPTION OF SYMBOLS 1 Frame 2 Upper shoji 3 Lower shoji 4 Housing 5 Panel body 10 Upper frame 10a Metal upper frame 10b Resin upper frame 10c Recessed part 10d Outdoor facing surface part 10e Airtight material 10f Heating foam material 11 Lower frame 11a Metal lower frame 11b Resin bottom Frame 11c Concave portion 11d Outdoor facing surface portion 11e Airtight material 11f Heating foam material 12 Vertical frame 12a Metal vertical frame 12b Resin vertical frame 12c Vertical guide groove 12d Outdoor facing surface portion 12e Airtight material 12f Heating foam material 14 Guide part 14a Diagonal guide groove 14b Guide groove 14c Outdoor side surface 14d Heating foam material 20 Upper flange 20b Outer peripheral surface portion 20c Heating foam material 21 Lower collar 21a Outer peripheral surface portion 21b Heating foam material 22 Vertical shaft 23 Balancer 24 Wire 25 Support member 26 Locking device 30 Fitting structure 31 Recess 32 Projection Part

Claims (3)

The upper shoji and the lower shoji suspended by a balancer are placed in a frame, and the upper shoji and the lower shoji each contain a panel in the housing, and the lower shoji is in the closed state in the state of the upper shoji. In the opening device arranged below,
The lower frame constituting the frame body has an inner peripheral surface facing the lower surface of the lower shoji, and a recess is formed on one of the inner peripheral surface of the lower frame and the lower surface of the lower shoji, A protrusion is formed on the other of the inner peripheral surface of the frame and the lower surface of the lowering paper so as to face the recess.
Of the lower frame and the lower shoji, the concave and projecting portions are made of metal ,
The opening device is characterized in that the depression and the projection are fitted to the lower shoji only in the event of a fire .   The opening device according to claim 1, wherein the recess is formed on a lower surface of the lower shoji, and the protrusion is formed on an inner peripheral surface of the lower frame. The opening device according to claim 1, wherein the lower shoji is arranged in the same plane as the upper shoji when closed.

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