JPH0530624A - Free access floor - Google Patents

Abstract

PURPOSE:To completely accomodate for the frequent modification of detailed layout by making it possible to take out and connect power supply and communication line from an arbitrary point even if the floor panel is enlarged and to make it possible to utilize the panel floor space for housing a large duct or cold/hot water piping. CONSTITUTION:A cantilever bottom board 9 and an upper shelf receiving piece 10 in parallel therewith are projecting integrally from the outer peripheral member 8d of a rectangular floor panel 7 having appropriate thickness. When the floor panels 7 are laid on the structural slab through supports 20, a duct space 28 for wiring and piping is formed between adjacent floor panels by means of the bottom board 9 and the side part of the outer peripheral member 8d having opposing ends, and the upper opening of the duct space 28 is closed by a cover 14 having end part born by the shelf receiving piece 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a computer room floor of a building,
Free access floors used for A (office automation) floors, etc.

[0002]

2. Description of the Related Art In recent years, when installing a computer or the like, a double floor structure having a space between a skeleton slab and a floor panel (floor board) is used, and the space is used for wiring, piping, air conditioning, etc. The number of free access floors is increasing. FIG. 11 shows an example thereof, in which 1 is a rectangular flat floor panel, but this floor panel 1 is supported by a support pillar 2 on a slab 3 of the frame, and wiring and piping 5 are provided under this floor panel 1. A space 4 is formed. In the figure, 6 is a floor finishing material applied to the floor panel 1, for example, a carpet or the like. Various proposals have been made regarding the material of the floor panel 1, the structure of the support columns 2, and the like. Further, the space 4 may be used in two or more stages by providing a shelf plate in the middle.

[0003]

The size of the floor panel 1 is usually 0.45 m to 0, depending on the floor support weight and material.
Since it is a relatively small panel of about 6 meters square, its supporting legs 2 are also vertically and horizontally arranged at this interval, and as a result, the space 4 is inevitably divided by the supporting columns 2 so that the wires and the like can be routed around. It is troublesome.

In addition to the wiring, there is no particular problem in using the space 4 as an air passage or a chamber, but if an air duct is required, the size of the duct cannot be made large. On the other hand, the floor panel 1 itself is opened and closed for inspection and wiring change. In this case, floor panel 1
If it was a relatively small panel, opening and closing of the panel 1 was relatively easy.

By the way, the free access floor has become a general office, has multiple uses, is equipped with heavy equipment, has an increased area, is more even and has a flexible air conditioning adjustment that is more suitable for the load of use, exhaust heat and odor, and a low load. It is not possible to solve the problems of layout, changes in layout, and the development of energy saving requirements by simply using the under-floor space of the panel as an air passage or a chamber, and it is necessary to use it as a place to accommodate large ducts and hot / cold water pipes on the lower surface of the panel. There is. In order to realize this, a large amount of wiring and piping are required. Therefore, it is necessary to reduce the number of support columns 2 in order to cope with the intricacies, and it is inevitably required to increase the size of the floor panel 1.

On the other hand, the use of a material such as an aluminum honeycomb panel which is lightweight and has extremely high bending rigidity enables the floor panel to be upsized. However, if the floor panel is increased in size in this way, the number of support pillars 2 is reduced accordingly,
The contradiction that makes the underfloor wiring inspection and change work, which is supposed to be easy, exaggerate again.

Particularly, a recent tendency of offices is to deal with frequent layout changes required for a flexible office system like a job project team.
Corresponding to additions, changes, and removals of communication and office automation equipment, we are highly satisfied with air conditioning, lighting, and aesthetic environment at all times, and respond to the life of the building.
Equipment that can support equipment updates is required, and it is necessary to satisfy a dual system that can quickly and easily respond to casual changes in the system while allowing large system changes.

There is an under-carpet wiring system in which tape-like wiring is laid under the carpet to cope with the system change, but this is a small joint because there are many joints of the panel and it is supported by a supporting column. There is a problem with using the free access panel
Moreover, there is a drawback that it becomes more and more difficult to open and close the panel.

The object of the present invention is to solve the disadvantages of the conventional example, and to take out a power supply and a communication line from any point even if the floor panel becomes large in size, and to connect them, thereby completely responding to frequent and frequent layout changes. Another object of the present invention is to provide a free access floor that enables the panel floor space to be used as a large duct and a space for accommodating the hot and cold water pipes on the lower surface of the panel.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cantilevered bottom plate and a shelf receiving piece which is parallel to the bottom plate on a cantilevered outer peripheral edge member of a floor panel having an appropriate thickness. And the bottom plate and the outer peripheral edge side of which end portions face each other between adjacent floor panels when the floor panels are laid on a skeleton slab through support pillars of a required height. And a duct space for wiring and piping is formed between the parts and the top opening of the duct space is closed by a cover lid that supports the end portion by the shelf receiving piece, and bolts are applied from inside the outer peripheral edge material at the corners of the floor panel. Of the support pillar at the upper end of the support pillar, and a bag groove-shaped engagement groove with an upper surface opening is provided on the support plate at the upper end of the support pillar, and the bolt is screwed into a nut slidably accommodated in the engagement groove to support the floor of the support pillar. Mounted on the bottom of the panel, or The supporting pillar is composed of a base pipe standing upright on the skeleton slab and a bolt that is screwed onto this base and moves up and down. A support having a spherical support surface is provided in the middle of the bolt, and a nut screwed to this support and the bolt. A support plate is provided by being sandwiched between the support plate and the bottom plate for cantilever support of the outer peripheral edge material of the floor panel, and bolt nuts are fixed to the support plate, and the bolt ends protruding from the outer peripheral edge material are brought into contact with the support plate. This is the summary.

[0011]

[Operation] The maximum size of the free access floor will be a maximum of 1 meter square or more due to restrictions on the load capacity of the panel, the material of the panel, the weight of the panel and the transportation means such as an elevator in the building.
It is considered not to exceed 6 meter square. According to the present invention, even in such a large floor panel, by using the joint portion as a wiring duct space, it is possible to provide a grid-shaped duct space in the vertical and horizontal directions of the panel on the panel surface portion, and this duct Electric power, communication, gas, and liquid can be taken out by directly taking out electric wires, pipes, etc. to be housed in the duct space at any position including the intersection of the duct space of the cover portion or the panel portion that closes the upper opening of the space. As a result, extremely fine and highly flexible layouts can be supported, and frequent and frequent layout changes can be perfectly supported.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is the first free access floor of the present invention.
FIG. 7 is a vertical cross-sectional side view of a main part showing an embodiment, in which reference numeral 7 is a floor panel for free access having a rectangular plane and an appropriate thickness. As shown in FIG. 7, the floor panel 7 has aluminum face plates 8 on the upper and lower surfaces of an aluminum honeycomb core 8a.
b and 8c are joined together to form a panel, and an outer peripheral edge member 8d made of an aluminum hollow extruded shape member is provided on the outer periphery.

When the floor panel 7 is made of a metal material, in addition to the honeycomb panel, an extruded assembly plate, a bent assembly plate,
It may be a press-formed plate, a cast plate, a metal-dissimilar material composite plate,
Various materials such as a ferro-cement board and a fiber-reinforced cement board can be used as the material-free material, and a resin-molded or assembled board, a plywood board, a fiber board, and the like can be used as the organic material.

On the outer peripheral edge member 8d, a cantilever-supported bottom plate 9 is integrally projectingly provided at the lower end of one side surface thereof in the horizontal direction. Also,
A shelf receiving piece 10 which is parallel to the bottom plate 9 above the bottom plate 9.
Similarly, the outer peripheral edge member 8d was integrally provided with a protrusion. This bottom plate 9
The upper surface of the bottom plate 9 may be formed by forming ribs 11 on the upper surface, which serve as guides for wiring and piping, in parallel with the length direction, and the tip of the bottom plate 9 may be cut off. It is formed as a bag groove 12 which opens to the side surface. Then, the elastic end portion 13 made of rubber or resin is provided at the tip of the bottom plate 9 by fitting the enlarged end portion into the bag groove portion 12.
The elastic strip 13 can be attached to the tip of the bottom plate 9 or can be fitted thereto.

As described above, the floor panel 7 is a rectangular flat panel, and as shown in FIG. 5, the outer peripheral edge member 8d is formed by joining the diagonally cut butt ends to form a corner portion. Square holder 23 made of synthetic resin at the corner
Through holes 24 are formed in the corners of the floor panel 7 including the holder 23 so as to vertically penetrate therethrough. Also, two holders 23 are arranged above and below, and the head 25 of the bolt 25 is placed between them.
By sandwiching a, the bolt 25 is supported inside the outer peripheral edge member 8d. In this way, the tip of the bolt 25 is attached to the through hole 24
The outer peripheral edge member 8d is made to project downward through the. The bolt 25 is a screw type bolt having a hexagonal screwdriver hole in the head portion 25a.

In the figure, reference numeral 14 is a cover lid when the floor panels 7 are laid side by side and they are hung over the shelf receiving pieces 10 of the adjacent floor panels 7, and 14a shown in FIG. 12 is arranged at the intersection of the floor panels 7. The cover is shown. An engaging groove 15 in the shape of a bag groove having an opening on the lower surface is formed in the longitudinal direction at the end of the cover lid 14, and the anchor portion 16a, which is an enlarged end, is fitted into the engaging groove 15, so that the pressure bearing portion is formed. A rubber strip 16 provided with a side surface repulsion portion 16c which is a thin umbrella piece at the end of 16b is attached to the end of the cover 14. The rubber strip 16 may be provided on the floor panel 7 side by providing the engaging strip groove 15 on the shelf receiving piece 10. The rubber strip 16 may be adhered to or fitted to the end of the cover lid 14 or the shelf receiving piece 10.

As shown in FIG. 3, an engaging groove 17 is formed by hook-shaped grooves 17a and 17b facing each other on the back side of the cover lid 14, and a rectangular through hole 18 which opens to the upper surface through the engaging groove 17 is formed. Was formed. The cover 14 is also made of extruded aluminum frame.

In the figure, 19 is a socket outlet,
The socket outlet 19 and the plug connector are formed with engaging grooves 19a at their side portions so that the upper portions thereof enter into the engaging grooves 17. From the end of the cover 14 to the engaging groove 19a, the hook-shaped groove is formed.
The socket outlet 19 and the plug connector are attached to the back surface of the cover 14 by engaging and sliding 17a and 17b. Further, the through hole 18 is large enough to take out the socket outlet 19, but the socket outlet 19 is detachably attached to the upper surface so that the synthetic resin cap 29 closes the through hole 18. . The connection between the socket outlet 19 and the cap 29 is performed by forming a protrusion having a hook-shaped cross section on the lower surface of the cap 29 and press-fitting the protrusion into a groove provided on the upper surface of the socket outlet 19. The engagement groove 17 may be formed on the side of the panel or the bottom plate.

In the figure, reference numeral 20 denotes a support column, which is composed of a triangular base plate 20a fixed on a skeleton slab with screws or the like, a cylindrical hollow main body 20b, and a rectangular upper plate 20c as shown in FIG. The support columns 20 are arranged at appropriate intervals on the skeleton slab, and the upper plate 20c is overlaid with the support plate 21 having the bag groove-shaped engagement grooves 21a having upward openings on the upper surface in the fitted state. Fix the support plate 21 with bolts and nuts 22. Further, the support plate 21 is made of an aluminum hollow extruded shape member, and in order to fit the upper plate 20c, the right and left ends thereof are bent into a hook shape, and a convex strip 21b is provided at the center.

The floor panels 7 are laid out so that the corners thereof are supported by the support columns 20 and the support plate 21, and the nuts are provided in the pocket groove-like engagement grooves 21a of the support plate 21.
26 is slidably accommodated, and a bolt 25 protruding downward from the inside of the outer peripheral edge member 8d is screwed into the nut 26 to join the floor panel 7 and the support column 20.

To screw the bolt 25 into the nut 26, a hexagonal screwdriver 27 as shown in FIG. 7 is used, and the screwdriver 27 is inserted from the through hole 24 and the bolt 25 is rotated. The horizontal level and inclination of the floor panel 7 can be adjusted by adjusting the screw length of the bolt 25. The upper plate 20c of the support column 20 is provided with a through hole for receiving the tip of the bolt 25. The support plate 21 is omitted, and the upper plate 20c is used as a substitute for the support plate 21,
It is also conceivable that the floor panel 7 is joined by forming a bag groove-shaped engaging groove 21a or a ridge plate 21b corresponding thereto.

When the floor panels 7 are laid side by side in this manner, the bottom plates 9 face each other at the ends between the adjacent floor panels 7, and wiring is performed between the bottom plates 9 and the side portions of the outer peripheral edge member 8. A duct space 28 for piping is formed. In addition, between the bag groove strips 12 at the ends of the bottom plate 9 facing each other, an elastic strip 13
The seal is made. Reference numeral 21b is a protruding ridge plate for positioning at the time of laying the panel, and the bolt 25 is aligned with the nut 26 by bringing the end of the bottom plate into contact with the ridge plate 21b. The panel can be positioned by providing a recess in the support plate and engaging the blind groove portion of the bottom plate, or by providing a recess in the bottom plate and engaging the projection strip of the support plate in the recess. It is also possible to combine them.

Wiring such as an electric cord and piping 5 are arranged in the duct space 28. In that case, since the upper surface of the bottom plate 9 is temporarily divided by the ribs 11, a plurality of electric wires and pipes 5 can be arranged by the ribs 11. Then, the upper surface opening of the duct space 28 is closed by the cover lids 14 and 14a, and the end portion of the cover lid 14 is supported by the shelf receiving piece 10, and the rubber strip 16 is interposed between the end of the cover lid 14 and the shelf receiving piece 10. The metal between the panel 1 and the cover 14 is prevented from directly contacting each other by the bearing portion 16b of the rubber strip 16 and the side-face repulsion portion 16c, and the elasticity of the side-face repulsion portion 16c of the rubber strip 16 prevents the panel 1 from moving. The side surface repulsion portion 16c always fills the gap with respect to the range of change in the size of the gap between the cover lid 14 and the panel 1 due to dimensional error and installation error. Further, the cover lid 14 is always positioned at the central portion of the upper surface opening of the duct space 28 by the repulsive force of the rubber strip 16 which is even on the left and right.

The wiring and the pipe 5 are taken out through the through hole 18. Further, as described above, the socket outlet 19 and the plug connector are attached to the cover lid 14, and these are located in the duct space 28. Therefore, the wiring and the pipe 5 can be connected to the socket outlet 19 or the like midway. , Through the socket outlet 19 and the like. The unused socket outlet 19 is closed by binding a cap 29 to the upper portion. Then, a floor finishing material 6 such as a carpet is laid on the surface of the laid-out floor panels 7. The cap 29 is located on the surface of the floor panel 7 with the same thickness as the floor finishing material 6.

In this way, the wiring and piping 5 can be arranged by appropriately selecting grid-like spaces in the vertical and horizontal directions of the panel by using the joint portion of the floor panel 7 as the duct space 28. Further, since the wiring and the piping 5 are located on the side of the floor panel 7, wiring can be performed immediately by removing the cover 14 to check or change the layout, and the piping 5 can be placed at any position including the intersection of the duct spaces 28. It can be taken out easily.

Further, since a space corresponding to the height of the support columns 20 is secured below the floor panel 7, it is possible to use this space as a storage place for large ducts and hot / cold water pipes. Further, since the floor panels 7 are sealed by the elastic strips 13 and the rubber strips 16 to prevent air from flowing between the underfloor and the room, dew condensation is prevented under the floor, and the underfloor space is air-conditioned. There is no problem in creating an air passage or chamber.

FIG. 8 shows a second embodiment of the present invention.
The floor panel 7 is the same as that of the first embodiment, but the structure of the supporting columns is changed. In this embodiment, a base plate 32 is fixed to the skeleton slab 3 with anchor bolts 31, and a base pipe 33 is erected on the base plate 32 by welding. A nut 34 is attached to the upper end of the base pipe 33 by welding. The support column 30 is composed of the base pipe 33 and a bolt 35 that is screwed into the base pipe 33 and moves up and down.

The bolt 35 is provided with a support 36 having a spherical support surface on the way.
And the tip of the bolt 35 is projected from the support 36.
In the figure, 37 is a support plate, but the support 36 and bolts
The support plate 37 is vertically sandwiched by the nuts 38 screwed to the 35 to provide the support plate 37 on the bolt 35, and the support plate 37 is extended to the bottom plate 9 that is cantilevered by the outer peripheral edge member 8d of the floor panel. A hole 41 is provided, and the bolt / nut 22 is engaged through the elongated hole 41, and the end of the bolt 25 protruding from the inside of the outer peripheral edge member 8d is brought into contact with the support plate 37.

Since the lower surface of the supporting plate 37 is supported by the supporting body 36 having a spherical supporting surface, fine adjustment of the inclination is easy and it is easy to make it horizontal. However, the supporting plate 37 should be fixed to the bolt 35 by welding. You can also Also, the horizontal length of the floor panel 7 can be adjusted by the protruding length of the bolt 25, and the distortion of the skeleton slab 3 and the like can be corrected by adjusting them.

Further, in this embodiment, the tip of the bottom plate 9 is cut off, and the sealing material 39 is fitted therein. In addition, bolt 35
To prevent the rotation of the cap, use a cap 40 with a hexagonal protrusion protruding downward from the disc body as shown in FIG. 9, insert the protrusion of this cap 40 into the upper end of the bolt 25, and screw the cap to the bottom plate 9. I chose

Also in the case of this embodiment, regarding how to install wiring such as an electric cord and piping in the duct space 28,
Since it is the same as the first embodiment, the description thereof will be omitted. In addition,
Bolts in both the first and second embodiments
Although the level can be adjusted by 25, the bottom plate 9 can be directly bolted to the column with or without the support plate.

[0032]

As described above, in the free access floor of the present invention, even in a large floor panel, by using the joint portion as a wiring duct space, a grid-like duct space can be formed in the vertical and horizontal directions of the panel. Can be provided. Then, the electric wire, the pipe, etc. to be housed in the duct space at any position including the intersection of the duct space of the panel space or the panel space that closes the upper opening of the duct space are directly taken out to take out electric power, communication, gas, and liquid. be able to. As a result, it is possible to deal with extremely fine and highly flexible layouts, and it is possible to completely deal with frequent and frequent layout changes.

Furthermore, the lower part of the floor panel can be used for other purposes, and for example, the space under the panel floor can be used as a storage place for a large duct or cold / hot water pipe on the lower surface of the panel.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts showing a first embodiment of a free access floor of the present invention.

FIG. 2 is a cross-sectional plan view of essential parts showing a first embodiment of the free access floor of the present invention.

FIG. 3 is a partial perspective view of a cover lid.

FIG. 4 is a perspective view of a support plate used in the first embodiment.

FIG. 5 is an exploded perspective view of a corner portion of the floor panel.

FIG. 6 is a perspective view of a support column used in the first embodiment.

FIG. 7 is a partially cutaway perspective view of a floor panel.

FIG. 8 is a vertical cross-sectional side view of essential parts showing a second embodiment of the free access floor of the present invention.

FIG. 9 is a perspective view of a cap used in the second embodiment.

FIG. 10 is a cross-sectional plan view of essential parts showing a second embodiment of the free access floor of the present invention.

FIG. 11 is a partially cutaway perspective view showing a conventional example.

FIG. 12 is a perspective view showing a cover lid arranged at an intersection of floor panels.

[Explanation of symbols]

1 ... Floor panel 2 ... Support pillar 3 ... Body slab 4 ... Space 5 ... Wiring, piping 6 ... Floor finishing material 7 ... Floor panel 8a ... Honeycomb cores 8b, 8c ... Face plate 8d ... Outer peripheral material 9 ... Bottom plate 10 ... Shelf support Piece 11 ... Rib 12 ... Bag groove slot 13 ... Elastic strip 14 ... Cover 15 ... Engagement groove 16 ... Rubber strip 16a ... Anchor part 16b ... Bearing part 16c ... Side repulsion part 17 ... Engagement grooves 17a, 17b ... Hook type groove 18 ... Through hole 19 ... Socket outlet 19a ... Engagement groove 20 ... Support pillar 20a ... Base plate 20b ... Hollow body 20c ... Upper plate 21 ... Support plate 21a ... Bag groove-like engagement groove 21b ... Convex plate 22 … Bolts and nuts 23… Holders 24… Through holes 25… Bolts 25a… Heads 26… Nuts 27… Screwdrivers 28… Duct spaces 29… Caps 30… Support posts 31… Base plates 32… Base pipes 33… Nuts 35… Bolts 36 … Support 37… Support plate 38… Nut 39… Seal material 40… Cap Flop 41 ... long hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeaki Baba             Sumitomo Light Gold 5-11-3 Shimbashi, Minato-ku, Tokyo             Inside the industry (72) Inventor Jun Hattori             Aichi Prefecture, Minato-ku, Nagoya City 3-chome 1-12             Sumitomo Light Metal Industries, Ltd. Nagoya Works (72) Inventor Ryoichi Tachibana             Sumitomo Light Gold 5-11-3 Shimbashi, Minato-ku, Tokyo             Inside the industry

Claims (5)

[Claims] 1. A cantilever-supported bottom plate and a shelf receiving piece which is parallel to the bottom plate above the cantilevered support plate are integrally provided on an outer peripheral edge member of the floor panel having a rectangular plane and an appropriate thickness, and the floor panel has a required height. Wiring with the bottom plate and the outer peripheral edge material side part where the ends face each other between the adjacent floor panels when laid on the skeleton slab through the support pillar of Sa, forming a duct space for piping,
A free access floor characterized in that an upper surface opening of the duct space is closed by a cover lid that supports the end portion with the shelf receiving piece. 2. A support groove is formed by forming a bag groove-shaped engagement groove in the longitudinal direction on the end of the cover or on the shelf receiving piece on the panel side, and fitting the anchor portion, which is an enlarged end, into the engagement groove. A rubber strip provided with a side repulsion part that is a thin umbrella piece at the end of the pressure part is interposed between the cover lid end and the shelf receiving piece, and the metal between the floor panel and the cover at the pressure bearing part and side repulsion part of the rubber strip. In addition to avoiding direct contact with each other, due to the elasticity of the side repulsion part of the rubber strip, the side repulsion part always fills the gap against the range of change in the size of the gap between the cover lid and floor panel due to panel dimensional error and installation error. The free access floor according to claim 1, wherein the cover lid is always positioned at the central portion of the upper surface opening of the duct space by the repulsive force of the rubber strips that are even on the left and right. 3. An engagement groove formed by a hook-shaped groove facing the back side of the cover, and the socket outlet, the plug connector, etc. are slidably mounted in the duct space by fitting in the engagement groove. The free access floor according to claim 1 and claim 2. 4. A cantilever-supported bottom plate and a shelf receiving piece which is parallel to the bottom plate above the cantilevered support plate are integrally provided on the outer peripheral edge member of the floor panel having a rectangular plane and an appropriate thickness, and the floor panels are laid out. In this case, the bottom plate and the side of the outer peripheral edge whose ends are opposed to each other between adjacent floor panels form a duct space for wiring and piping, and the top opening of the duct space is terminated by the shelf receiving piece. It is closed by a cover lid that supports the section, the bolt is projected downward from the outer peripheral edge material at the corner of the floor panel, and a bag groove-shaped engagement groove with an upper surface opening is provided on the support plate at the upper end of the support column. A free access floor characterized in that a support pillar is attached to the lower surface of a floor panel by screwing the bolt into a nut that is slidably housed in a groove. 5. A cantilever-supported bottom plate and a shelf receiving piece which is parallel to the bottom plate above the cantilevered support plate are integrally provided on the outer peripheral edge member of the floor panel having a rectangular plane and an appropriate thickness, and the floor panels are laid out. In this case, the bottom plate and the side of the outer peripheral edge whose ends are opposed to each other between adjacent floor panels form a duct space for wiring and piping, and the top opening of the duct space is terminated by the shelf receiving piece. It is closed by a cover lid that supports the part, the bolt is projected downward from the outer peripheral material at the corner of the floor panel, and the support pillar is a base pipe standing on the skeleton slab and a bolt that moves up and down by screwing on this base. A support body having a spherical support surface is provided in the middle of the bolt, and the support plate is provided by being sandwiched between the support body and a nut screwed with the bolt, and the support plate is cantilevered on the outer peripheral edge material of the floor panel. Supporting bottom plate and bolts and nuts At the same time, the free access floor is characterized in that the bolt end protruding from the inside of the outer peripheral edge member is brought into contact with the support plate.