JP6745451B2 - Folding door with window - Google Patents

Description

The present invention relates to a folding door with a window.

A folding door is a type of door that opens and closes a passage (see Patent Document 1). The folding door described in Patent Document 1 is attached to an entrance/exit of a vehicle. This folding door has two door panels arranged in the vehicle front-rear direction, and the edges of the door panels are rotatably connected to each other. Each door panel has a window in which a window member (such as a glass plate) is fitted.

Conventionally, as shown in FIG. 10, it is often used to attach a window member 101 to a door panel 100 with a support rubber 102 having a substantially H-shaped cross section. Specifically, the inner edge of the opening 105 of the door panel 100 is fitted in one groove 103 of the support rubber 102, and the outer edge of the window member 101 is fitted in the other groove 104 of the support rubber 102. Thus, the support rubber 102 is sandwiched between the inner edge of the opening 105 of the door panel 100 and the outer edge of the window member 101, and the window member 101 is supported by the door panel 100 via the support rubber 102. Has been done.

JP2012-207462A

When the above-described attachment structure of the window member 101 is adopted, the work load when the support rubber 102 is fitted between the inner edge of the opening portion 105 of the door panel 100 and the outer edge of the window member 101 is likely to be large, and thus the work involved in the attachment It is easy to become less active. In order to solve such a problem, it is conceivable to adopt a mounting structure for fixing the window member to the outer surface in the thickness direction of the door panel without using the supporting rubber.

Here, for folding doors, there is a demand to make each door panel thin so as to enlarge a passage opening at the time of opening operation. In this respect, if the window member is simply fixed to the outer surface of the door panel, the folding door tends to be thick, and the above-mentioned demand may not be met.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a folding door with a window in which the window member can be easily attached while suppressing the door panel from becoming thick.

A folding door with a window for solving the above problem has two door panels whose end edges are rotatably connected to each other, and a window member is attached to at least one of the door panels. The door panel includes a plurality of plate members lined up at intervals in the thickness direction thereof, and the inner edge of the opening to which the window member is attached is a flange in which the plurality of plate members are overlapped with each other. The window member is adhered to the flange in a state where the outer edge of the member extends along the flange and the window member is arranged inside the door panel in the thickness direction.

According to the above configuration, the window member can be attached to the door panel by an easy operation such as bonding the window member to the door panel (specifically, the flange) in a state where the window member is positioned with respect to the opening of the door panel. Moreover, since the portion where the plurality of plate members lined up at intervals in the thickness direction of the door panel are overlapped with each other is a flange, the flange can be arranged so as to extend inside the door panel in the thickness direction. .. Therefore, by adhering the window member to this flange, the window member can be housed inside the door panel, and the folding door can be prevented from becoming thick.

In the folding door with a window, the flange has a plurality of through holes, the window member is provided with a convex portion protruding toward the flange at a position facing the plurality of through holes, the through hole. It is preferable that the inner edge of the hole and the convex portion are engaged with each other.

According to the above configuration, the window member can be positioned with respect to the door panel through a simple operation such as inserting the convex portion of the window member into the through hole of the flange and engaging the convex portion with the inner edge of the through hole. Therefore, the work for attaching the window member can be easily performed.

In the folding door with a window, it is preferable that the opening has a quadrangular shape and the through hole is provided at a portion corresponding to a corner of the quadrangular shape.
Even if the protrusion amount of the flange inward of the opening is partially increased in order to secure the space for forming the through hole, the portion of the opening of the door panel corresponding to the square corner has a substantially open shape. The part that is kept in a square. On the other hand, the part other than the part corresponding to the corner is a part where the opening shape of the opening cannot be kept square when the projection amount is partly increased. If, for example, the amount of protrusion of the portion other than the portion corresponding to the corner is increased and the opening shape of the opening is maintained in a substantially square shape, the entire portion that corresponds to one side of the quadrangular shape at the inner edge end of the flange is inward of the opening. Therefore, in this case, the opening area of the opening becomes small.

According to the above configuration, since the through hole is provided in a portion corresponding to a square corner of the opening, it is possible to maintain the opening shape of the opening in a square shape while suppressing a decrease in the opening area of the opening, A space for arranging the through hole can be secured.

In the folding door with a window, it is preferable that the door panel has a cover on a surface opposite to a surface facing the window member, the cover covering the through hole and the protruding end of the convex portion.

According to the above configuration, although the through hole and the convex portion that engages with the inner edge of the through hole are provided in the folding door, since the through hole and the convex portion are covered with the cover, the through hole and the convex portion are Compared to the one exposed to the outside, it is possible to suppress the deterioration of appearance.

In the folding door with a window, it is preferable that the cover is arranged inside the door panel in the thickness direction.
According to the above configuration, since the cover does not partially protrude from the outer surface of the folding door, the cover interferes with the opening/closing operation of the folding door, and the portion opened by the opening operation of the folding door is made into a material. Will prevent the cover from getting in the way when the vehicle passes.

In the folding door with a window, the folding door is provided on the vehicle, and the window member is arranged outside the vehicle with respect to the flange.
According to the above configuration, the mounting portion of the window member has a structure in which the opening of the door panel is closed from the outside of the vehicle by the window member. Therefore, by forming the outer surface of the door panel and the outer surface of the window member by smooth surfaces, it is possible to easily reduce the unevenness of the vehicle outer surface at the mounting portion. This makes it possible to reduce the air resistance of the vehicle.

According to the folding door with a window of the present invention, the window member can be attached by an easy operation while suppressing the door panel from becoming thick.

The perspective view of the vehicle to which the folding door with a window of one embodiment is applied. The side view which looked at the same folding door from the vehicle outside. FIG. 3 is an end view of the folding door taken along line 3-3 of FIG. 2. The end view which followed the 4-4 line of FIG. 2 of the same folding door. The exploded view of a positioning member and its circumference. The side view which looked at the window member from the vehicle inside. The perspective view of a positioning member. The side view which looked at the folding door in the state where the window member was removed from the vehicle outside. (A) is a bottom view of the cover, (b) is a side view of the cover. Sectional drawing of the conventional folding door.

Hereinafter, an embodiment of a folding door with a window will be described.
As shown in FIG. 1, the folding door 20 of the present embodiment is attached to the entrance/exit 11 of the vehicle 10. The folding door 20 has two door panels 30 each having a substantially rectangular flat plate shape. These door panels 30 are arranged in the front-rear direction of the vehicle 10, and a window member 40 made of a glass plate is attached to each of them. The two door panels 30 have a substantially mirror image in their structure, but have the same basic structure. Therefore, in the following description, the same reference numerals are given to the respective parts, and duplicate description will be omitted.

As shown in FIG. 2, a plurality of hinges 21 are provided between the two door panels 30, and the edges of each door panel 30 are rotatably connected via the hinges 21. A handle 22 used to open and close the folding door 20 is provided on one door panel 30.

When the folding door 20 of the present embodiment is operated to be closed, the two door panels 30 are in a state where the two door panels 30 extend in a plate shape (the state shown in FIG. 1), and the entrance 11 is closed. On the other hand, when the folding door 20 is operated to be opened, the folding portion 20 is bent at the connecting portion of the two door panels 30 to open the entrance/exit 11.

As shown in FIGS. 2 and 3, each door panel 30 includes two plate members (outer panel 31A and inner panel 31B[lined in the thickness direction (direction shown by arrow D in FIG. 3) spaced apart from each other]. FIG. 3]). Each panel body 31 is provided with a substantially rectangular opening 32. The inner edge of the opening 32 is a portion (hereinafter, flange 33) extending in a state where the outer panel 31A and the inner panel 31B are overlapped with each other. The flange 33 extends inside the door panel 30 in the thickness direction D (within the range indicated by the arrow C in FIG. 3 ).

The window member 40 is attached to each door panel 30 so as to close the opening 32 of the panel body 31. The window member 40 is arranged outside the vehicle (upper side in FIG. 3) than the flange 33 so that the outer edge of the window member 40 extends along the flange 33 of the panel body 31. Further, the window member 40 is arranged inside the door panel 30 in the thickness direction D. Then, in this state, the window member 40 is fixed to the panel body 31 by bonding the outer edge of the window member 40 and the inner edge of the flange 33 with the adhesive 43.

An elastically deforming portion 23, which is made of an elastic material (for example, synthetic rubber) and covers the entire end portion, is attached to the end portion of each panel body 31 on the side of the connecting portion. When the folding door 20 is operated to be closed, these elastically deforming portions 23 are pressed against each other and close the space between the two door panels 30. Further, an elastically deforming portion 24 formed of an elastic material (for example, synthetic rubber) and covering the entire end portion is attached to an end portion of each panel body 31 on the opposite side to the connecting portion. When the folding door 20 is operated to be closed, the elastically deforming portion 24 is pressed against the inner edge of the entry/exit opening 11 of the vehicle 10, and the inner edge of the entry/exit opening 11 and the folding door 20 (specifically, each door panel 30). It comes to close the gap.

As shown in FIGS. 4 and 5, the folding door 20 according to the present embodiment is provided with the positioning member 50 (the convex portion 51) provided on the window member 40 and the through hole 34 provided on the door panel 30 through the engagement. The window member 40 is positioned with respect to the door panel 30. In addition, such a structure for positioning is adopted in a total of 6 positions, 3 positions for each door panel 30.

Hereinafter, the structure for positioning will be described in detail.
As shown in FIGS. 6 and 7, in the positioning member 50, the convex portion 51, the base portion 52, the pedestal portion 53 (FIG. 7), the rib 54, and the locking protrusion 55 are integrally formed of a synthetic resin material. Become. The base portion 52 is formed in a substantially square flat plate shape. The pedestal portion 53 projects from one surface of the base portion 52 in a circular cross section. The rib 54 projects in a flat plate shape that connects the outer surface of the base portion 52 and the outer peripheral surface of the pedestal portion 53. The convex portion 51 is tapered and has a substantially circular cross-section, and has a cross-sectional shape with a diameter smaller than that of the pedestal portion 53 and projects from the projecting end of the pedestal portion 53. A plurality of (four in this embodiment) locking protrusions 55 are provided on the convex portion 51 so as to be arranged at equal intervals in the outer peripheral direction thereof. These locking projections 55 are provided on the convex portion 51 in a state of protruding outward from the outer peripheral surface of the convex portion 51 and elastically deformable so as to be housed inside the convex portion 51. Has been.

As shown in FIG. 6, the positioning member 50 is provided at three positions of the corners of the substantially square window member 40. In these positioning members 50, the base portion 52 is attached to the window member 40 by the double-sided tape in a mode in which the pedestal portion 53 and the convex portion 51 project from the base portion 52 toward the flange 33 side (front side of the paper surface of FIG. 6). , Are fixed to the window member 40.

A colored layer 41 made of a colored (black in the present embodiment) material is formed on the surface of the window member 40 on the flange 33 side by ceramic printing. The colored layer 41 covers the outer edge portion of the window member 40 over the entire circumference. Since the positioning member 50 is attached to the surface of the colored layer 41, the positioning member 50 is hidden by the colored layer 41 and invisible from the outside of the vehicle 10 (see FIG. 2 ). Further, the colored layer 41 has a shape covering the entire flange 33 of the door panel 30, and the flange 33 and the adhesive 43 are hidden from the outside of the vehicle 10 by being hidden by the colored layer 41.

As shown in FIG. 8, the through hole 34 has a circular cross section and is formed in the flange 33 of the panel body 31. The opening 32 of the door panel 30 (specifically, the portion surrounded by the inner edge of the flange 33) has a quadrangular shape, and the through holes 34 are provided at three positions of the corners of the quadrangular opening 32. ing. In addition, in this embodiment, in order to secure a space for forming the through hole 34, in a portion corresponding to a corner of the rectangular opening 32, the protrusion of the flange 33 toward the inside of the opening 32 is larger than that of other portions. The amount (protrusion amount indicated by W in FIG. 8) is increased.

Here, even if the protrusion amount W is partially increased in order to secure the space for forming the through hole 34, the portion of the opening 32 of the door panel 30 that corresponds to the square corner has the opening shape of the opening 32. Is the part that is kept in a substantially square shape. On the other hand, as shown by an alternate long and two short dashes line in FIG. 8, if the protrusion amount W is partly increased in portions other than the portions corresponding to the corners, the opening shape of the opening 32 cannot be kept square. It is a part. If the amount of protrusion W of the portion other than the portion corresponding to the corner is increased and the opening shape of the opening 32 is maintained in a substantially square shape, the inner edge of the flange 33 at the inner edge of the flange 33 is indicated by an arrow B in FIG. Since it is necessary to position the entire part corresponding to one side of the quadrangular shape inside the opening 32, in this case, the window (specifically, the opening area of the opening 32) becomes small.

In the folding door 20 of the present embodiment, each through hole 34 is provided in a portion corresponding to a square corner of the opening 32. This makes it possible to increase the protrusion amount W of the flange 33 toward the inside of the opening 32 in a manner in which the opening shape of the opening 32 can be kept square while suppressing the reduction of the opening area of the opening 32. it can.

The work of attaching the window member 40 to the door panel 30 is performed as follows.
First, the adhesive 43 is applied to the outer edge of the surface of the window member 40 facing the flange 33 (the portion indicated by the alternate long and short dash line in FIG. 6). The adhesive 43 is applied to a position closer to the outer edge end than the positioning member 50, over the entire circumference of the outer edge of the window member 40.

Thereafter, as shown in FIGS. 4 and 5, each convex portion 51 of the positioning member 50 of the window member 40 is inserted into each through hole 34 of the flange 33 of the door panel 30. As a result, the convex portion 51 (specifically, the locking projection 55) of the positioning member 50 and the inner edge of the through hole 34 of the flange 33 are engaged with each other (the state shown in FIG. 4), and the window member 40 is closed. It will be locked in the state of being positioned with respect to.

Then, in this state, the adhesive 43 applied to the window member 40 is cured. As a result, at the position closer to the outer edge end than the positioning member 50, the door panel 30 and the window member 40 are bonded by the adhesive 43 so as to fill the gap between the flange 33 and the window member 40 over the entire circumference of the outer edge of the window member 40. Adhesive fixed.

Further, in the folding door 20 of the present embodiment, the cover 60 that covers the through hole 34 and the protruding end of the convex portion 51 is attached to the surface of each door panel 30 (specifically, the flange 33 thereof) on the inner side of the vehicle (lower side in FIG. 4 ). Has been.

As shown in FIGS. 9A and 9B, in the cover 60, a cover body 61 and a plurality of (two in the present embodiment) locking claws 62 are integrally formed of a synthetic resin material. There is. The cover body 61 is formed in a substantially cylindrical shape with a lid. The locking claws 62 project from the open end of the cover body 61 (lower end in FIG. 9B) at equal intervals.

As shown in FIG. 8, in the flange 33 of the panel body 31, a through hole 35 having a rectangular cross section is formed in the vicinity of the through hole 34 with which the convex portion 51 of the positioning member 50 engages. Specifically, a plurality of (two in the present embodiment) through holes 35 are provided for one through hole 34 at positions sandwiching the through hole 34, respectively.

As shown in FIGS. 4 and 5, when attaching the cover 60, each locking claw 62 (FIG. 5) of the cover 60 is inserted into each through hole 35 (see FIG. 8) of the flange 33 from the inside of the vehicle, The locking claw 62 is engaged with the inner edge of each through hole 35 . As a result, the cover 60 is attached to the door panel 30 in such a manner as to cover the through hole 34 and the projecting end of the convex portion 51. The shape of the cover 60 is determined such that the entire cover 60 is arranged inside the door panel 30 in the thickness direction D (within the range indicated by the arrow C in FIG. 4 ).

According to this embodiment, the following operational effects can be obtained.
(1) In the folding door 20 of the present embodiment, the window member 40 is a flange in a state where the outer edge of the window member 40 extends along the flange 33 and the window member 40 is arranged inside the door panel 30 in the thickness direction D. It is glued to 33. Therefore, the window member 40 can be attached to the door panel 30 by an easy operation such as bonding the window member 40 to the flange 33 of the door panel 30 with the window member 40 positioned with respect to the opening 32 of the door panel 30.

(2) Moreover, since the portion where the outer panel 31A and the inner panel 31B that are lined up at intervals in the thickness direction D are overlapped with each other is the flange 33, it extends inside the door panel 30 in the thickness direction D. The flange 33 can be arranged in a manner. Therefore, by adhering the window member 40 to the flange 33, the window member 40 can be housed inside the door panel 30, and the folding door 20 can be prevented from becoming thick.

(3) At the position closer to the outer edge than the positioning member 50, the door panel 30 and the window member 40 are bonded by the adhesive 43 so as to fill the gap between the flange 33 and the window member 40 over the entire circumference of the outer edge of the window member 40. Adhesive fixed. Therefore, the adhesive 43 functions as a seal member that seals the gap between the window member 40 and the door panel 30. Therefore, the folding door 20 can have a simpler structure than a folding door provided with a structure for fixing the window member to the door panel and a structure for sealing the gap between the window member and the door panel separately.

(4) In the folding door (see FIG. 10) of the comparative example in which the window member is fixed to the opening by using the supporting rubber having the substantially H-shaped cross section, the soft door is made of a soft rubber material between the opening of the door panel and the window member. Since the support rubber is provided, the rigidity of the door panel (particularly around the opening) tends to be low. In the folding door 20 of the present embodiment, although the opening 32 is provided in the door panel 30, the relatively hard adhesive 43 causes the door panel 30 and the window member 40 to be formed over the entire circumference of the inner edge of the opening 32. It is glued. Therefore, the rigidity of the door panel 30 can be made higher than that of the folding door of the comparative example.

Further, as described above, since there is a demand for making each door panel of the folding door thin, it can be said that the rigidity of the door panel tends to be low. It is conceivable to provide a reinforcing member inside to increase the rigidity of the door panel, but in this case, the weight is increased. In this regard, according to the folding door 20 of the present embodiment, without increasing the thickness of the door panel 30 or adding a reinforcing member, in other words, while suppressing an increase in the thickness or weight of the door panel 30, The rigidity can be increased.

(5) The flange 33 of the panel body 31 is provided with a plurality of through holes 34, and the window member 40 is provided with a convex portion 51 projecting toward the flange 33 at a position facing the through hole 34. There is. Then, the inner edge of the through hole 34 and the convex portion 51 are engaged with each other. Therefore, the window member 40 is positioned with respect to the door panel 30 through a simple operation such as inserting the convex portion 51 of the window member 40 into the through hole 34 of the flange 33 and engaging the convex portion 51 with the inner edge of the through hole 34. Therefore, the work for attaching the window member 40 can be easily performed.

(6) Each through hole 34 is provided in a portion corresponding to a square corner of the opening 32. Therefore, the protrusion amount W of the flange 33 toward the inside of the opening 32 can be increased in such a manner that the opening shape of the opening 32 can be kept square while suppressing the reduction of the opening area of the opening 32. A space for arranging the through hole 34 can be secured.

(7) A cover 60 that covers the through hole 34 of the flange 33 and the protruding end of the protrusion 51 of the positioning member 50 is attached to the surface of the door panel 30 opposite to the surface facing the window member 40. Therefore, although the through-hole 34 and the positioning member 50 are provided in the folding door 20, since the through-hole 34 and the positioning member 50 (specifically, the protruding end of the convex portion 51) are covered with the cover 60, the through-hole 34 and the convex member 50 are provided. Compared to the case where the portion 51 is exposed to the outside of the door panel 30, it is possible to suppress deterioration of appearance.

(8) The cover 60 is arranged inside the door panel 30 in the thickness direction D. Therefore, since the cover 60 does not partially protrude from the outer surface of the folding door 20, the cover 60 interferes with the opening/closing operation of the folding door 20 and a portion opened by the opening operation of the folding door 20 ( It is possible to prevent the cover 60 from being an obstacle when an occupant passes through the entrance/exit 11).

(9) Since the window member 40 is disposed on the vehicle outer side than the flange 33 of the panel body 31, the opening 32 of the door panel 30 is closed from the vehicle outer side by the window member 40 at the mounting portion of the window member 40. Become a structure. As a result, the outer surface of the vehicle 10 at the mounting portion is not formed by the flange 33 and the opening 32, and the outer surface of the panel body 31 (specifically, the outer panel 31A) and the periphery of the flange 33 and the window member. And the outer surface of 40. Therefore, by forming the outer surface of the panel body 31 and the outer surface of the window member 40 by smooth surfaces, it is possible to easily reduce the unevenness of the outer surface of the vehicle 10 at the mounting portion (see FIG. 3 ). As a result, the air resistance of the vehicle 10 can be reduced, so that noise such as wind noise and unnecessary vibration of the window member 40 can be suppressed. Further, the appearance of the vehicle 10 can be improved by reducing the irregularities on the outer surface of the vehicle 10.

<Modification>
The above embodiment may be modified and implemented as follows.
-Instead of the window member 40 made of a glass plate, a window member made of a synthetic resin plate material may be provided.

-In place of the cover 60, a cover having a shape partially protruding to the outside of the door panel 30 in the thickness direction D may be adopted.
The shape of the cover can be arbitrarily changed as long as the through hole 34 of the flange 33 and the protruding end of the convex portion 51 of the positioning member 50 can be covered. For example, it is possible to employ a square annular cover or the like that covers the entire surface of the flange 33 on the vehicle inner side.

-The cover 60 and the through hole 35 can be omitted.
The two positioning members 50 and the through holes 34 may be provided in one door panel 30, or four or more positioning members 50 may be provided in each door panel 30.

The positioning member 50 may be provided in a portion other than the portion of the window member 40 that abuts the square corner, and the through hole 34 may be provided in a portion of the flange 33 that faces the convex portion 51 of the positioning member 50.

The shape of the positioning member can be arbitrarily changed as long as it has a protrusion having a shape that engages with the inner edge of the through hole 34 of the flange 33.
The positioning member 50 and the through hole 34 can be omitted if the window member 40 is properly positioned with respect to the panel body 31 when the window member 40 is attached.

The folding door of the above-described embodiment can be applied to a folding door having an opening that opens in any shape such as a polygonal shape other than a square shape, a circular shape, an elliptical shape, or the like.
The folding door of the above embodiment is not limited to the folding door 20 provided at the entrance/exit 11 of the vehicle 10, but can be applied to a folding door provided in another vehicle such as a ship.

10... Vehicle, 11... Entrance/exit, 20... Folding door, 21... Hinge, 22... Handle, 23, 24... Elastic deformation part, 30... Door panel, 31... Panel body, 31A... Outer panel, 31B... Inner panel, 32... Opening part, 33... Flange, 34, 35... Through hole, 40... Window member, 41... Colored layer, 43... Adhesive, 50... Positioning member, 51... Convex part, 52... Base part, 53... Pedestal part, 54 ... ribs, 55... locking projections, 60... cover, 61... cover body, 100... door panel, 101... window member, 102... support rubber, 103, 104... groove, 105... opening.

Claims (3)

A folding door with a window having two door panels whose end edges are rotatably connected to each other and a window member attached to at least one of the door panels,
The door panel includes a plurality of plate members lined up at intervals in the thickness direction thereof, and the inner edge of the opening to be attached to the window member is a flange in which the plurality of plate members are stacked,
With the outer edge of the window member extending along the flange and the window member being arranged inside the door panel in the thickness direction, the window member is bonded to the flange ,
The flange has a plurality of through holes,
The window member is provided at a position facing the plurality of through holes with a convex portion that projects toward the flange,
The inner edge of the through hole and the convex portion are engaged,
In the flange of the door panel, a cover for covering the projecting end of the through hole and the protruding portion is arranged on the inner surface of the door panel in the thickness direction, on the surface opposite to the surface facing the window member. Folding door with window characterized by being installed in the state . A folding door with a window having two door panels whose end edges are rotatably connected to each other and a window member attached to at least one of the door panels,
The door panel includes a plurality of plate members lined up at intervals in the thickness direction thereof, and the inner edge of the opening to be attached to the window member is a flange in which the plurality of plate members are stacked,
While the outer edge of the window member extends along the flange and the window member is arranged inside the door panel in the thickness direction, the window member is bonded to the flange,
The flange has a plurality of through holes and a pair of through holes having a rectangular cross section at positions sandwiching the through holes,
The window member is provided at a position facing the plurality of through holes with a convex portion that projects toward the flange,
The inner edge of the through hole and the convex portion are engaged,
The cover that covers the through hole and the protruding end of the convex portion has a pair of locking claws that are inserted into the pair of through holes having a rectangular cross section, and is arranged inside the door panel in the thickness direction. Attached to the flange of the door panel,
The locking claw and the inner edge of the through hole having a rectangular cross section are engaged,
The folding door is provided in the vehicle,
The window member is arranged on the vehicle outer side than the flange.
A folding door with a window characterized by this. In the folding door with a window according to claim 1 or 2 ,
The opening has a rectangular shape,
The folding door with a window, wherein the through hole is provided in a portion corresponding to the corner of the quadrangular shape.

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