JP7556729B2 - Center column fixing tray - Google Patents

Description

The present invention relates to a tray for fixing a center column.

A center post is used when multiple shutters are used to open and close a wide opening. The center post has a guide groove on the side that guides the end of the shutter curtain, and the rod of the lifting and lowering fitting attached to the lower end of the visible part is dropped into a center post fixing tray buried in a specified position in the ground, thereby fixing it in a specified position in the width direction of the opening.

Such a tray for fixing a center column is disclosed in Patent Documents 1 and 2. Types of trays for fixing a center column include one with a recess extending vertically from a long hole extending in the direction of the opening width, as disclosed in Patent Document 1, and one with multiple round holes formed in the box-shaped top surface, as disclosed in Patent Document 2.

In the former type, the walls of the recess extend vertically from the edge of the long hole in the receiving plate so that the garbage that has entered the recess can be easily scraped out. However, when the receiving tray is buried in the ground or floor, if there is a gradient or unevenness, the receiving tray plate 8 is installed at an angle along the gradient, so that the walls 90'', 91'', of the recess that normally extend vertically, are buried at an angle. In such a case, the clearance between the short-side width dimension of the long hole and the rod 600 of the lifting and dropping fitting 6 is small, so that as shown in FIG. 12, the rod 600 of the lifting and dropping fitting 6 may come into contact with the inclined wall 90'' of the recess, and the rod 600 may not be able to descend to the specified depth d2. In some lifting and dropping fittings, the lifting and dropping fittings are locked by lowering the rod to a specified depth, and the lowered state of the rod relative to the receiving tray is maintained (Patent Document 3). Therefore, if the rod comes into contact with the inclined wall 90'' of the recess and cannot descend to the depth d2, the lowered state of the rod 600 cannot be maintained, which may cause problems in fixing the center post 5.
Published Japanese Patent Application No. 61-26895 Actual fairness 05-10155 Patent Publication No. 2018-48466

The present invention aims to provide a tray for fixing a center column that allows the center column to be fixed even if the tray is installed in an inclined position.

The first technical means adopted in the present invention is:
A center-column fixing tray includes a plate having a long hole formed therein, and a recess formed on the lower surface of the plate with the hole as an opening, and receives a center-column fixing rod from the opening into the recess when the center column is fixed,
The receiving hole has a first long edge, a second long edge, and left and right side edges,
The recess includes a first wall whose upper end coincides with the first long edge, a second wall whose upper end coincides with the second long edge, left and right side walls whose upper ends coincide with the left and right side edges, respectively, and a bottom.
The recess has a depth such that a bottom of the recess is located below a depth position corresponding to a lower end of the rod when the center column is fixed,
The first wall and the second wall extend continuously from an upper end to a depth exceeding at least the depth position while gradually separating from each other downward.
It is a tray for fixing the center column.

In one aspect, the first wall and the second wall of the recess of the center column fixing tray extend continuously downward from the upper end to a depth at least greater than the depth position, gradually separating from each other, and further extend continuously from a depth greater than the depth position toward the bottom.
That is, the inner surfaces of the first wall and the second wall of the recess are continuous surfaces without irregularities from the edge to the bottom of the receiving hole.
In one embodiment, the first wall and the second wall extend continuously from the top end to the bottom while gradually becoming spaced apart from each other downward.
In one aspect, the first wall and the second wall extend continuously downward from an upper end to a depth at least greater than the depth position, while gradually separating from each other, and further extend continuously from a depth greater than the depth position toward the bottom, while gradually approaching each other.

Typically, the receiving hole is adapted to receive two center column fixing rods, but there is no limit to the number of rods that can be received by one receiving hole.

The second technical means adopted in the present invention is:
A center-column fixing tray includes a plate having at least one round receiving hole formed therein, and a recess formed on the lower surface of the plate with the receiving hole as an opening, the center-column fixing tray receiving a center-column fixing rod from the opening into the recess when the center-column is fixed,
An upper end of a wall surface of the recess is aligned with the receiving hole,
The recess has a depth such that a bottom of the recess is located below a depth position corresponding to a lower end of the rod when the center column is fixed,
The wall surface of the recessed portion extends downward from an upper end to a depth exceeding the depth position while continuously increasing in diameter.
It is a tray for fixing the center column.

In one aspect, the wall surface of the recess of the center column fixing tray extends continuously from the upper end to a depth at least exceeding the depth position, gradually widening in diameter downward, and further extends continuously from a depth exceeding the depth position toward the bottom.
That is, the inner surface of the side wall of the recess is a continuous surface without irregularities from the edge to the bottom of the receiving hole.
In one embodiment, the wall surface of the recess extends downward from the upper end to the bottom while the diameter thereof continuously increases.
In one aspect, the wall surface of the recess extends downward from the upper end to a depth at least exceeding the depth position while the diameter continuously increases, and further extends continuously from a depth exceeding the depth position toward the bottom while gradually decreasing in diameter.

Typically, the plate has two receiving holes formed to receive two center column fixing rods, but the number of receiving holes is not limited.

The present invention allows the rod of the lifting and lowering fitting to descend to a specified depth position within the recess of the tray, making it possible to fix the center column, even if the tray for fixing the center column is installed in an inclined position.

The upper end of the recess in the tray for fixing the center column is aligned with the edge of the receiving hole formed in the plate, making it easy to scrape out any debris that has entered the recess.

FIG. 2 is a front view of a double shutter device. FIG. 2 is a vertical cross-sectional view showing the center pillar of a double shutter device. FIG. 2 is a diagram showing a center column fixing tray according to the first embodiment. 1A and 1B are a side view and a front view of a lifting and lowering fitting provided at the lower end of the center pillar, and a receiving tray for fixing the center pillar according to the first embodiment is also shown. 13 is a diagram showing the relationship between the center column fixing rod and the center column fixing tray in a horizontal position. FIG. 13 is a diagram showing the relationship between the center column fixing rod and the center column fixing tray in an inclined position. FIG. FIG. 13 is a diagram showing a center column fixing tray according to a modified example of the first embodiment. 13 is a diagram showing the relationship between the center column fixing rod and the center column fixing tray in a horizontal position. FIG. 13 is a diagram showing the relationship between the center column fixing rod and the center column fixing tray in an inclined position. FIG. FIG. 11 is a diagram showing a center column fixing tray according to the second embodiment. FIG. 13 is a diagram showing a center column fixing tray according to a modified example of the second embodiment. FIG. 13 is a diagram showing the relationship between a center column fixing rod and a conventional center column fixing tray in an inclined position.

The embodiment of the present invention will be described with reference to the drawings. Figure 1 is a front view of a double-unit lightweight shutter, which opens and closes a building opening with a first shutter curtain 1 and a second shutter curtain 2. A first guide rail 3 and a second guide rail 4 are erected at both ends of the building opening in the width direction, and a center post 5 is provided in the center of the building opening in the width direction. The center post 5 has a first facing part 50, a second facing part 51, and left and right side parts 52, 53, and has a first guide groove 54 on the side part 52 and a second guide groove on the side part 53 along the height direction. A lifting and dropping metal fitting 6 is provided below the first facing part 50 of the center post 5. A center post fixing tray 7 is buried in a predetermined part of the ground GL, which uses the lifting and dropping metal fitting 6 to fix the lower end part of the center post 5.

By installing the center post 5 in a predetermined position, the building opening is divided into a first opening and a second opening, and the first shutter curtain 1 opens and closes the first opening by raising and lowering with one widthwise end guided by the first guide rail 3 and the other widthwise end guided by the first guide groove 54 of the center post 5, and the second shutter curtain 2 opens and closes the second opening by raising and lowering with one widthwise end guided by the second guide rail 4 and the other widthwise end guided by the second guide groove (not shown) of the center post 5.

The lifting and lowering fitting 6 is formed in an inverted U-shape from the left and right center column fixing rods 600, 600 and the upper gripping portion 601.

The lock includes a lifting/lowering rod 60 and a case 61 that supports the lifting/lowering rod 60 so that the lifting/lowering rod 60 can move up and down. The lifting/lowering rod 60 can move up and down between an upper position (unlocked state) when the center pillar is not fixed and a lower position (locked state) when the center pillar is fixed. In Figures 4 to 6, 8, and 9, the rod 600 in the upper position is shown by a solid line, and the rod 600 in the lower position is shown by a two-dot chain line.

The lifting and dropping fitting 6 in this embodiment is structured so that the lifting and dropping rod 60 is pressed down a specified stroke, and when the pin on the rod 600 passes over the locking portion of the lock piece, it is locked and maintained in the pressed-down state, and the lifting and dropping rod 60 cannot be maintained in the lowered state unless it is lowered to the lower position (the lower end of the rod 600 is at depth d2). In addition, springs are built into both rods 600. For the specific structure of the lifting and dropping fitting 6, refer to Patent Document 3.

[First embodiment of the tray for fixing the center column]
As shown in Fig. 3, the center-column fixing tray 7 according to the first embodiment comprises a plate 8 in which a long hole-shaped receiving hole 80 extending in the opening width direction is formed, and a recess 9 formed in the underside of the plate 8 with the receiving hole 80 as the upper end opening, and is buried under the building opening so that the upper surface of the plate 8 is flush with the ground GL. The center-column fixing tray is designed to receive a rod 600 from the opening (receiving hole 80) of the plate 8 into the recess 9 when the center column is fixed.

The receiving hole 80 formed in the plate 8 is composed of a first long edge 800, a second long edge 801, and left and right side edges 802, 803, and the recess 9 is composed of a first wall 90 whose upper end coincides with the first long edge 800 of the receiving hole 80, a second wall 91 whose upper end coincides with the second long edge 801, left and right side walls 92, 93 whose upper ends coincide with the left and right side edges 802, 803, respectively, and a bottom 94. In this embodiment, the recess 9 is fixed to the plate 8 by welding a folded piece to the upper ends of the plate material forming the first wall 90 and second wall 91 of the recess 9 in contact with the lower surface of the plate 8 and welding the upper ends of the side walls 92, 93 to the lower surface of the plate 8. The width of the receiving hole 80 in the short direction (the shortest distance between the first long edge 800 and the second long edge 801) is slightly larger than the diameter of the rod 600, and when the rod 600 is received, there is a clearance (between the receiving hole 80 and the rod 600) that does not affect the fixation of the center column.

The recess 9 has a depth d1 such that the bottom 94 is located below the depth position d2 corresponding to the lower end of the rod 600 when the center column is fixed, and the bottom 94 of the recess 9 is located below the lower end of the rod 600 dropped into the recess 9. The first wall 90 and the second wall 91 of the recess 9 extend continuously downward from the upper end to a depth at least exceeding the depth position d2, while gradually separating from each other. The distance between the first wall 90 and the second wall 91 of the recess 9 (the shortest distance on an imaginary plane parallel to the surface of the plate 8) increases continuously from the upper end downward relative to the width of the receiving hole 80 in the short direction. The width dimension of the horizontal bottom 94 in the short direction is larger than the width dimension of the receiving hole 80 in the short direction, and the width dimension of the bottom 94 in the long direction is the same as the width dimension of the receiving hole 80 in the long direction.

In the center column fixing tray 7 according to the first embodiment, the first wall 90 and the second wall 91 of the recess 9 extend downward continuously while gradually separating from each other until they reach the bottom 94. In the center column fixing tray 7 according to the first embodiment, the first wall 90 and the second wall 91 of the recess 9 are inclined planes that extend downward in a widening manner in a side view, and the recess 9 is formed into a generally trapezoidal shape in a side view by the inclined first wall 90 and second wall 91 and the horizontal bottom 94. The first wall 90 and the second wall 91 may form a gently curved surface. The left and right side walls 92, 93 of the recess 9 are vertical walls that extend perpendicular to the plate 8.

Figure 5 shows the relationship between the rod 600 of the lifting and lowering fitting 6 and the center column fixing tray 7 in a horizontal position. The rod 600 of the lifting and lowering fitting 6 is lowered into the recess 9 through the receiving hole 80 of the center column fixing tray 7, and the lower end of the rod 600 is located at depth position d2, so that the rod 600 is maintained in a lowered state.

6 is a diagram showing the relationship between the rod 600 of the lifting and lowering fitting 6 and the center column fixing tray 7 in an inclined position (front-rear direction). The plate 8 of the center column fixing tray 7 is inclined according to the inclination of the ground GL (maximum inclination of 4° is assumed), so that the center column fixing tray 7 is buried in an inclined position and the recess 9 is also inclined. The first wall 90 and the second wall 91 of the recess 9 according to the first embodiment extend continuously from the upper end to a depth exceeding at least the depth position d2 while gradually separating from each other downward. Therefore, in the illustrated embodiment, in the recess 9 in an inclined position, the first wall 90 extends approximately vertically, and the second wall 91 extends at a larger inclination angle. In this state, when the rod 600 is dropped into the recess 9 from the receiving hole 80, the rod 600 does not come into contact with the first wall 90 or the second wall 91 of the recess 9, and the rod 600 descends until the lower end of the rod 600 reaches the appropriate depth position d2, and the descended state is maintained. In this embodiment, the left and right side walls 92, 93 of the recess 9 are vertical walls, but like the first wall 90 and the second wall 91, they are inclined walls that extend continuously downward from the top end to the bottom 94 while gradually separating from each other, making it possible to accommodate a case in which the center column fixing tray 7 is inclined in the left-right direction.

In the recess 9 of the center column fixing tray 7 according to the first embodiment, the upper ends of the walls of the recess 9 (the first wall 90, the second wall 91, and the inner surfaces of the left and right side walls 92, 93) coincide with the edges of the receiving hole 80 (the first long edge 800, the second long edge 801, the side edges 802, 803), and the walls extend continuously (without any irregularities) from the bottom 94 to the upper end of the receiving hole 80, making it easy to scrape out any debris that has entered the recess 9.

[Modification of the first embodiment of the center column fixing tray]
A modified example of the center column fixing tray 7 according to the first embodiment is shown in Fig. 7. The center column fixing tray 7 shown in Fig. 3 and the center column fixing tray 7 shown in Fig. 7 differ in the shapes of the first and second walls, but are substantially the same in other configurations, and the same reference numbers are used for the same components, so that the description according to the first embodiment can be used as appropriate.

The recess 9 of the center column fixing tray 7 according to the modified example of the first embodiment has a depth d1 such that the bottom 94 is located below the depth position d2 corresponding to the lower end of the rod 600 when the center column is fixed, and the bottom 94 of the recess 9 is located below the lower end of the rod 600 dropped into the recess 9. The first wall 90' and the second wall 91' of the recess 9 are composed of first parts 900, 910 that extend continuously downward from the upper end to a depth exceeding at least the depth position d2 while gradually separating from each other, and second parts 901, 911 that extend continuously from the lower ends of the first parts 900, 910 toward the bottom 94 while gradually approaching each other. The width dimension of the horizontal bottom 94 in the short direction is the same as the width dimension of the receiving hole 80 in the short direction, and the width dimension of the bottom 94 in the long direction is the same as the width dimension of the receiving hole 80 in the long direction. The first portion 900 of the first wall 90' and the first portion 910 of the second wall 91' of the recess 9 are inclined planes that extend downward in a flared shape when viewed from the side, and the second portions 901 and 911 are inclined planes that extend from the lower ends of the first portions 900 and 910 toward the horizontal bottom portion 94. The first wall 90' and the second wall 91' may form a gently curved surface. The second portions 901 and 911 may also be vertical walls, in which case the width dimension in the short direction of the horizontal bottom portion 94 is greater than the width dimension in the short direction of the receiving hole 80.

Figure 8 shows the relationship between the rod 600 of the lifting/lowering fitting 6 and the center column fixing tray 7 in a horizontal position. The rod 600 of the lifting/lowering fitting 6 is dropped into the recess 9 through the receiving hole 80 of the center column fixing tray 7, and the lower end of the rod 600 is located at depth position d2, so the rod 600 is maintained in a lowered state.

9 is a diagram showing the relationship between the rod 600 of the lifting and lowering fitting 6 and the center column fixing tray 7 in an inclined position (front-rear direction), where the plate 8 of the center column fixing tray 7 is inclined according to the inclination of the ground GL (assuming a maximum inclination of 4°), so that the center column fixing tray 7 is buried in an inclined position and the recess 9 is also inclined. The first part 900 of the first wall 90' and the first part 910 of the second wall 91' of the recess 9 in the modified first embodiment extend continuously downward from the upper end to a depth at least exceeding the depth position d2 while gradually separating from each other, so that in the illustrated embodiment, in the recess 9 in an inclined position, the first part 900 of the first wall 90' extends approximately vertically, and the first part 910 of the second wall 91' extends at a larger inclination angle. In this state, when the rod 600 is dropped into the recess 9 from the receiving hole 80, the rod 600 does not come into contact with the first wall 90' or the second wall 91' of the recess 9, and the rod 600 descends until the bottom end of the rod 600 is at the appropriate depth position d2. In this embodiment, the left and right side walls 92, 93 of the recess 9 are vertical walls, but similar to the first wall 90' and the second wall 91', they can be provided with inclined walls that extend continuously downward from the upper end to a depth at least exceeding the depth position d2 while gradually separating from each other, thereby making it possible to deal with the case where the center column fixing tray 7 is inclined in the left and right direction.

In the recess 9 of the center column fixing tray 7 in the modified version of the first embodiment, the upper ends of the wall surfaces of the recess 9 (first wall 90', second wall 91', and the inner surfaces of the left and right side walls 92, 93) coincide with the edges of the receiving hole 80 (first long edge 800, second long edge 801, side edges 802, 803), and the wall surfaces extend continuously (without any irregularities, etc.) from the bottom 94 to the upper end of the receiving hole 80, making it easy to scrape out any debris that has entered the recess 9.

[Second embodiment of the tray for fixing the center column]
10, the center-column fixing tray 7 according to the second embodiment includes a plate 8 in which two circular receiving holes 80' are formed spaced apart in the width direction of the opening, and a recess 9' formed in the underside of the plate 8 with each receiving hole 80' as an opening at the upper end, and is buried under a building opening so that the upper surface of the plate 8 is flush with the ground GL. The center-column fixing tray is designed to receive the rod 600 of the lifting and lowering fitting 6 from the opening (receiving hole 80') of the plate 8 into the recess 9' when the center column is fixed.

The receiving hole 80' formed in the plate 8 has a circular edge, and the recess 9' consists of a side wall 95 whose upper end (inner surface) coincides with the edge of the receiving hole 80', and a horizontal bottom 94 at the lower end of the side wall 95. In this embodiment, the recess 9' is fixed to the plate 8 by welding the upper end of the outer surface of the side wall 95 of the recess 9' to the lower surface of the plate 8. The diameter of the receiving hole 80' is slightly larger than the diameter of the center column fixing rod 600, and when the rod 600 is received, there is a clearance (clearance between the receiving hole 80' and the rod 600) that does not affect the fixing of the center column.

Each recess 9' has a depth d1 such that the bottom 94 is located below the depth position d2 corresponding to the lower end of the rod 600 when the center column is fixed, and the bottom 94 of the recess 9' is located below the lower end of the rod 600 dropped into the recess 9'. The side wall 95 of the recess 9' extends continuously from the upper end to a depth exceeding at least the depth position d2 while gradually increasing in diameter downward. The diameter of the side wall 95 of the recess 9' increases continuously downward relative to the diameter of the receiving hole 80'. The diameter of the bottom 94 is larger than the diameter of the receiving hole 80'. In the center column fixing receiving plate 7 according to the second embodiment, the diameter of the side wall 95 of the recess 9' extends continuously while gradually increasing in diameter downward until it reaches the bottom 94, and the recess 9' is formed in a truncated cone shape.

When the plate 8 of the center column fixing tray 7 according to the second embodiment is buried in an inclined position (front-rear direction) according to the inclined ground GL, the recess 9' also inclines. The side wall 95 of the recess 9' according to the second embodiment extends continuously from the upper end to a depth exceeding at least the depth position d2 while gradually expanding downward, so that in the recess 9' at the assumed maximum inclination position (4°), the side wall 95 of the recess 9' in the inclined position is not located inside the receiving hole 80' (the plate 8 is in an inclined position) in a plan view (the direction of the arrow, which is also the descending direction of the rod 600) (see the upper right diagram of FIG. 10). In this state, when the center column fixing rod 600 is dropped from the receiving hole 80' into the recess 9', the rod 600 does not come into contact with the side wall 95 of the recess 9, and the rod 600 descends until the lower end of the rod 600 is at the appropriate depth position d2. The upper right diagram in Figure 10 shows a case where the center column fixing tray 7 is tilted in the front-to-back direction, but the center column fixing tray 7 in the second embodiment can also be used when the center column fixing tray 7 is tilted in the left-to-right direction.

In the recess 9' of the center column fixing tray 7 according to the second embodiment, the upper end of the wall surface (side wall 95) of the recess 9' coincides with the edge of the receiving hole 80', and the wall surface extends continuously (without any irregularities) from the bottom 94 to the upper end, making it easy to scrape out any debris that has entered the recess 9'.

[Modification of the second embodiment of the center column fixing tray]
A modified example of the center column fixing tray 7 according to the second embodiment is shown in Fig. 11. The center column fixing tray 7 shown in Fig. 10 and the center column fixing tray 7 shown in Fig. 11 are different in the shape of the side wall, but are substantially the same in other configurations, and the same reference numbers are used for the same components, so that the explanation of the second embodiment can be appropriately used.

The recess 9' of the center column fixing tray 7 according to the modified example of the second embodiment has a depth d1 such that the bottom 94 is located below the depth position d2 corresponding to the lower end of the rod 600 when the center column is fixed, and the bottom 94 of the recess 9' is located below the lower end of the rod 600 dropped into the recess 9'. The side wall 95' of the recess 9' is composed of a first portion 950 that extends continuously from the upper end to a depth exceeding at least the depth position d2 while gradually expanding downward, and a second portion 951 that extends continuously from the lower end of the first portion 950 toward the bottom 94 while gradually reducing in diameter. The diameter of the first portion 950 of the side wall 95' of the recess 9' expands continuously from the upper end downward with respect to the diameter of the receiving hole 80', and the diameter of the second portion 951 continuously reduces from the lower end of the first portion 950 toward the bottom 94, and in this embodiment, the diameter of the bottom 94 is the same as the diameter of the receiving hole 80'. The second portion 951 may be a vertical wall (with a constant diameter in the depth direction), in which case the diameter of the horizontal bottom 94 is larger than the diameter of the receiving hole 80'.

When the plate 8 of the center column fixing tray 7 according to the modified second embodiment is buried in an inclined position (front-rear direction) according to the inclined ground GL, the recess 9' is also inclined. The first part 950 of the side wall 95' of the recess 9' according to the modified second embodiment extends continuously from the upper end to a depth exceeding at least the depth position d2 while gradually expanding downward, so that in the recess 9' in the assumed maximum inclination position (4°), the first part 950 of the side wall 95' of the recess 9' in the inclined position is not located inside the receiving hole 80' (the plate 8 is in an inclined position) in a plan view (the direction of the arrow, which is also the descending direction of the rod 600) (see the upper right diagram of FIG. 11). In this state, when the center column fixing rod 600 is dropped from the receiving hole 80' into the recess 9', the rod 600 does not come into contact with the first part 950 of the side wall 95' of the recess 9, and the rod 600 descends until the lower end of the rod 600 is at the appropriate depth position d2. The upper right diagram in Figure 11 shows a case where the center column fixing tray 7 is tilted in the front-to-back direction, but the center column fixing tray 7 according to the modified example of the second embodiment can also be used when the center column fixing tray 7 is tilted in the left-to-right direction.

In the recess 9' of the center column fixing tray 7 in the modified second embodiment, the upper end of the wall surface (side wall 95') of the recess 9' coincides with the edge of the receiving hole 80', and the wall surface extends continuously (without unevenness, etc.) from the bottom 94 to the upper end, making it easy to scrape out any debris that has entered the recess 9'.

6 Lifting and lowering metal fitting 600 Rod 7 Receiving tray for fixing center column 8 Plate 80 Receiving hole 800 First long edge 801 Second long edge 802, 803 Side edge 80' Receiving hole 9 Recess 90 First wall 91 Second wall 90' First wall 900 First portion 901 of first wall 90' Second portion 91' of first wall 90' Second wall 910 First portion 911 of second wall 91' Second portion 94 of second wall 91' Bottom d2 Depth position of the lower end of the rod when the center column is fixed

Claims (4)

A center-column fixing tray includes a plate having a long hole formed therein, and a recess formed on the lower surface of the plate with the hole as an opening, and receives a center-column fixing rod from the opening into the recess when the center column is fixed,
The center column fixing tray is embedded so that the upper surface of the plate is flush with the ground,
The receiving hole has a first long edge, a second long edge, and left and right side edges,
The recess includes a first wall having an upper end coinciding with the first long edge, a second wall having an upper end coinciding with the second long edge, left and right side walls having upper ends coinciding with the left and right side edges, respectively, and a bottom.
The recess has a depth such that a bottom of the recess is located below a depth position corresponding to a lower end of the rod when the center column is fixed,
the first wall and the second wall are inclined planes that extend continuously downward from an upper end that coincides with the receiving hole to a depth that exceeds at least the depth position while gradually separating from each other,
a distance between the first wall and the second wall is equal to the width of the receiving hole in the short side direction at the upper end, and is continuously enlarged downward from the upper end, and is greater than the width of the receiving hole in the short side direction at least over a depth exceeding the depth position ;
Receptacle for fixing center column. The first wall and the second wall of the recess of the center column fixing tray extend continuously downward from an upper end to a depth exceeding the depth position while gradually separating from each other, and further extend continuously from a depth exceeding the depth position toward a bottom portion.
The center column fixing tray according to claim 1. A center-column fixing tray includes a plate having at least one round receiving hole formed therein, and a recess formed on the lower surface of the plate with the receiving hole as an opening, the center-column fixing tray receiving a center-column fixing rod from the opening into the recess when the center-column is fixed,
The center pillar fixing tray is embedded so that the upper surface of the plate is flush with the ground,
An upper end of a wall surface of the recess is aligned with the receiving hole,
The recess has a depth such that a bottom of the recess is located below a depth position corresponding to a lower end of the rod when the center column is fixed,
a wall surface of the recess extends from an upper end coinciding with the receiving hole to a depth exceeding the depth position while continuously increasing in diameter downward , and the diameter of the wall surface of the recess is the same as the diameter of the receiving hole at the upper end, continuously increases from the upper end downward, and is larger than the diameter of the receiving hole at least over a depth exceeding the depth position ;
Receptacle for fixing center column. The wall surface of the recess of the center column fixing tray extends continuously from the upper end to at least a depth exceeding the depth position while gradually expanding downward, and further extends continuously from a depth exceeding the depth position toward the bottom.
The tray for fixing a center column according to claim 3.

Images