JP2011208454A - Mounting fitting for column cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting fitting for a column cover, which is structurally simple and excellent in productivity and portability.SOLUTION: The mounting fitting 1 includes an upside mounting piece 9 which is equipped with an upward slit vertically elongated upward from below, and a downside mounting piece 10 which is equipped with a downward slit vertically elongated downward from above and which is loosely fitted to and crosses the upside mounting piece 9 in an approximate cross shape by inserting the downward slit into the upward slit. One internal corner portion (n), which comprises the approximately cross-shaped upside and downside mounting pieces 9 and 10, abuts on a corner portion 5 of a support 2; and the upside and downside mounting pieces 9 and 10 are fixed to first and second outer surfaces 4a and 4b of the support 2. In addition, the upside and downside mounting pieces 9 and 10 include main plate portions 9b and 10b which are fixed to the outer surface 4 of the support 2, and a pair of side plate portions 9c and 10c which are provided at both the ends of the main plate portions 9b and 10b, respectively, and which are fitted with the column cover 3.

Description

  The present invention relates to a mounting hardware for a pillar cover having a simple structure and excellent productivity and portability.

  Conventionally, as shown in FIG. 11 (a), for example, in a decorative column t such as a front porch column standing outside a house, a column u made of steel and extending in the vertical direction, and the column The column cover w is made of a decorative finish and is spaced apart from u and surrounds the column u, and a mounting hardware a for mounting the column cover w to the column u.

  As shown in FIG. 11B, the mounting hardware a is composed of a pair of mounting pieces b and b having the same shape.

  Each of the mounting pieces b has a central portion d that extends linearly in a cross-sectional view perpendicular to the longitudinal direction thereof, and is connected to both sides thereof and extends at an angle of substantially 45 ° with respect to the central portion d. The first mounting piece c and the second mounting piece e having an intersection angle of substantially 90 °, and a small length that bends at substantially 90 ° at the end of each of the first mounting piece c and the second mounting piece e. Side pieces f and g. Then, the mounting hardware a is integrally formed in a substantially cross-shaped cross section by welding in advance in a factory or the like with the center portion d of the pair of mounting pieces b and b facing each other back to back.

  After such mounting hardware a is transported to the site, it is mounted along the intersections of the first mounting pieces c and c on the corner portion u1 of the column u, and bolts B1 are attached to the outer surfaces u2 of the column u. Fixed. Further, each side piece f, g of the mounting hardware a fixed to the support column u has an L-shaped cross section in which a wooden base material h is fixed with screws B2 and is equally divided into four through the base material h. The end of the column cover piece w1 is fixed with screws B3. Further, a watertight material j is disposed between the column cover pieces w1. Thereby, the cylindrical column cover w surrounding the column u is attached to the column u.

  However, since the mounting hardware a is formed by welding a pair of mounting pieces b, b, much labor is required for manufacturing. In addition, due to welding variations and the like, it is difficult to obtain a right-angled intersection of the first mounting pieces c and c, and the accuracy is likely to decrease. Furthermore, since the cross section is substantially cross-shaped, it is easy to be bulky and has poor transport efficiency. Related technologies include the following.

JP 2007-56731 A JP 2003-97038 A

  The present invention has been devised in view of the above problems, and includes an upper mounting piece having an upward slit extending from the bottom to the top, and a downward slit extending from the top to the bottom, and the downward slit being the upward slit. The upper mounting piece and the lower mounting piece that loosely intersects in a substantially cross shape by being inserted into the upper mounting piece, and a single corner portion formed by the fitted upper mounting piece and the lower mounting piece are used as the support column. To provide a column cover mounting hardware with a simple structure and improved productivity and portability, based on the fact that the upper mounting piece and the lower mounting piece are fixed to the outer surface of the support column in contact with the corner portion of the column. Is the main purpose.

  According to the first aspect of the present invention, the first outer surface and the second outer surface extending in the vertical direction have a column having at least one corner portion orthogonal to each other, and the cylinder is separated from the column and surrounds the column. A mounting bracket for mounting a cylindrical pillar cover, wherein the mounting bracket includes an upper mounting piece having an upward slit extending vertically from bottom to top and a downward slit extending vertically from top to bottom. And including the upper mounting piece and a lower mounting piece that loosely intersects in a substantially cross shape by inserting the downward slit into the upward slit, and the substantially cross-shaped upper mounting piece and the lower mounting piece include An upper corner piece and a lower side mounting piece are fixed to the first outer surface and the second outer surface of the column, with one corner portion constituting the abutting portion being brought into contact with a corner portion of the column, and the upper mounting piece and Bottom mounting Are fixed to the outer surface of the support column so as to protrude to both sides in the horizontal direction along the outer surface, and are provided at both ends of the main plate portion in the horizontal direction and to which the column cover is attached. And a pair of side plate portions having a mounting surface.

  According to a second aspect of the present invention, the upper mounting piece and the lower mounting piece have the same shape, and the lower mounting piece is used upside down with respect to the upper mounting piece. It is a mounting hardware for the pillar cover.

  According to a third aspect of the present invention, the pair of side plate portions of the upper mounting piece and the pair of side plate portions of the lower mounting piece are formed of bent pieces bent at an angle of 90 ° from the main plate portion. Or it is the attachment hardware of the pillar cover of 2 description.

  The invention according to claim 4 is the invention according to claim 3, wherein the bent piece of the upper mounting piece and the bent piece of the lower mounting piece are bent in the same direction with respect to each main plate portion. It is a mounting hardware for the pillar cover.

  According to a fifth aspect of the present invention, the upper mounting piece includes an upper fin that is bent in an opposite direction to the bent piece at an upper edge of the main plate portion, and the lower mounting piece is below the main plate portion. 5. The mounting bracket for a pillar cover according to claim 4, further comprising a lower fin that is bent at the edge in a direction opposite to the bent piece.

  According to a sixth aspect of the present invention, the main plate portion of the upper mounting piece and the main plate portion of the lower mounting piece are formed with through holes through which bolts for fixing to the support columns pass. It is the attachment metal fitting of the pillar cover in any one of.

  The invention according to claim 7 is the mounting hardware for the pillar cover according to any one of claims 1 to 6, wherein a plurality of upward slits and a plurality of downward slits of the lower mounting piece are formed. It is.

  The column cover mounting hardware of the present invention includes an upper mounting piece having an upward slit extending vertically from the bottom to the top and a lower mounting piece having a downward slit extending vertically from the top to the bottom. By inserting at the position of the slit, the upper mounting piece and the lower mounting piece can be loosely fitted in a cross shape. Then, one corner formed by the substantially cross-shaped upper mounting piece and lower mounting piece is brought into contact with a corner portion forming a right angle of the support column, and the upper and lower mounting pieces are placed on the outer surface of the support column. Each is fixed. By such fixing, the upper mounting piece and the lower mounting piece are finished at a right angle without any play and are fixed to the support column. Therefore, unlike the prior art, there is no need to weld and fix the pair of mounting pieces in advance at a factory or the like. Therefore, the mounting hardware of the present invention has good productivity.

  Moreover, what is necessary is just to insert a mutual slit in a construction site and to cross | intersect a substantially cross shape with an upper attachment piece and a lower attachment piece. Therefore, it is not necessary to combine the upper mounting piece and the lower mounting piece from the factory to the construction site, and can be transported apart. Therefore, the mounting hardware according to the present invention has a small package shape and improved portability.

  Further, in the mounting hardware according to the present invention, since the mounting surfaces of the four column covers can be provided around the column as in the conventional case, the column cover can be stably mounted on the column using this mounting surface. .

It is a perspective view of a decorative pillar using the attachment hardware of the pillar cover of one embodiment of the present invention. It is sectional drawing of FIG. It is a perspective view explaining the attachment metal fitting of this embodiment. It is a perspective view of the assembly of the attachment metal fitting of FIG. It is the perspective view which attached the base material to the side-plate part of the attachment metal fitting of this embodiment attached to the support | pillar. It is sectional drawing explaining an example of the load figure for conveying the attachment hardware of the pillar cover of this embodiment. (A) is a perspective view explaining the attachment hardware of other embodiment, (b) is a perspective view of the assembly of the attachment hardware of (a). It is sectional drawing of the decorative pillar using the hardware of FIG. It is a perspective view explaining the attachment metal fitting of the pillar cover of other embodiment. It is sectional drawing explaining the support | pillar of other embodiment. (A) is sectional drawing of the decorative pillar using the attachment hardware of the conventional pillar cover, (b) is a perspective view of the attachment hardware of the pillar cover.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the column cover mounting hardware 1 of the present embodiment is provided with a cylindrical column cover 3 that is spaced apart from the column 2 and surrounds the column 2 on a column 2 that extends in the vertical direction. For example, it is suitably used for a decorative column A such as an entrance porch column.

  The column 2 has at least one corner portion 5a in which the first outer surface 4a and the second outer surface 4b are orthogonal to each other. In the cross section shown in FIG. 2, the column 2 of the present embodiment extends in a direction perpendicular to the end portions of the first outer surface 4a and the second outer surface 4b, and is smaller than the first to second outer surfaces 4a and 4b. The third outer surface 4c and the fourth outer surface 4d are interrupted. Thereby, the support | pillar 2 is formed in the square cylinder shape of the open cross section which has a total of three corner parts 5a thru | or 5c which opened between the 3rd outer surface 4c and the 4th outer surface 4d. However, it goes without saying that the cross-sectional shape of the support column 2 may be, for example, a square tube shape with a closed cross-section as shown in FIG. Moreover, various steel materials, such as carbon steel, stainless steel, or alloy steel, are used suitably for such support | pillar 2, for example.

  As is apparent from FIG. 2, the column cover 3 of the present embodiment is configured in a rectangular tube shape with a substantially square cross section. The pillar cover 3 is made of, for example, a ceramic material, and is preferably finished with a tile or the like attached to the outer surface. Such a column cover 3 is useful for concealing the column 2 over its entire length and enhancing the appearance as a decorative column.

  Moreover, the pillar cover 3 of this embodiment is formed from, for example, four corner pieces 3a having an L-shaped cross section having the same length of one side by being divided at the midpoint of each side of the square. In addition, the cross-sectional shape of the pillar cover 3, a division | segmentation method, etc. are not limited to such specific embodiment.

  As shown in FIG. 3, the mounting hardware 1 of this embodiment includes an upper mounting piece 9 having an upward slit 9 a extending vertically from the bottom to the top, and a downward slit 10 a extending vertically from the top to the bottom. And a lower mounting piece 10 provided with Then, as shown in FIG. 4, the upper mounting piece 9 and the lower mounting piece 10 can intersect with each other in a loosely fitting manner by inserting the slits 9a and 10a into each other. Here, “intersecting in a substantially cross shape in a loosely fitted state” means that the crossing angle between the upper mounting piece 9 and the lower mounting piece 10 fitted through each slit is about 90 ° ± 10 °. It means a state with backlash so that it can be displaced. Such a loose fit state is obtained by forming the width W5 of the slits 9a, 10a slightly larger than the thickness T1 of the mounting pieces 9, 10.

  Further, the upper mounting piece 9 is provided on a plate-like main plate portion 9b fixed to the first outer surface 4a of the support column 2, and on the both ends in the horizontal direction of the main plate portion 9b, and the column cover 3 is attached. A pair of side plate portions 9 c having a surface 13. Similarly, the lower mounting piece 10 is also provided at a plate-like main plate portion 10b fixed to the second outer surface 4b of the support column 2 and both ends in the horizontal direction of the main plate portion 10b, and the column cover 3 is attached thereto. And a pair of side plate portions 10c having mounting surfaces 14 to be mounted.

  As shown in FIGS. 2 and 3, each of the main plate portions 9 b and 10 b has a flat plate shape extending on a single plane, and both are fixed along the outer surface 4 a or 4 b of the column 2. Further, each main plate portion 9b, 10b has a horizontal length W1 of the support column 2 so as to protrude from the outer surface of the support column 2 to both sides in the horizontal direction when fixed to the outer surface 4a or 4b of the support column 2. It is set larger than the width W3 of the first outer surface 4a and the second outer surface 4b. On the other hand, the length W1 of the main plate portions 9b and 10b is set to be smaller than the internal dimension W4 of the column cover 3. The vertical length H1 of each main plate portion 9b, 10b is appropriately determined in consideration of the strength of the material.

  Further, the upward slit 9 a is formed in the main plate portion 9 b of the upper mounting piece 9. The upward slit 9a has a length that is perpendicular to the upper edge 9y from the lower edge 9x of the main plate portion 9b and is half the vertical length H1 of the main plate portion 9b. Similarly, the downward slit 10 a is formed in the main plate portion 10 b of the lower mounting piece 10. The lower slit 10a has a length that is perpendicular to the upper edge 10y from the upper edge 10y of the main plate portion 10b to the lower edge 10x and is half the vertical length H1 of the main plate portion 10b. Therefore, in the present embodiment, when the upper mounting piece 9 and the lower mounting piece 10 are loosely crossed via the slits 9a and 10a, the vertical dimension can be minimized. In the present embodiment, each of the upward slit 9a and the downward slit 10a is provided at an intermediate position of the length W1 of the main plate portion 9b and the main plate portion 10b.

  Further, as shown in FIG. 2 or 3, the main plate portion 9 b of the upper mounting piece 9 and the main plate portion 10 b of the lower mounting piece 10 have through holes r through which bolts B <b> 1 for fixing to the column 2 pass. Is formed. Note that holes corresponding to the through holes r are also formed on the outer surfaces 4a and 4b of the support column 2 at a predetermined pitch in the height direction (not shown).

  As shown in FIGS. 3 to 4, the side plate portions 9c and 10c of the present embodiment are at both ends of the main plate portions 9b and 10b, respectively, at an angle of substantially 90 ° with respect to the main plate portions 9b and 10b. It consists of bent pieces 15 and 16 that are bent. It is desirable that the horizontal length W2 of the side plate portions 9c and 10c is appropriately determined to be, for example, about 10 to 30 mm in order to attach the corner piece 3a of the column cover 3. The bent pieces 15 and 16 are bent in the same direction with respect to the main plate portions 9b and 10b, respectively. The upper mounting piece 9 and the lower mounting piece 10 can be easily manufactured by reducing the cost by forming slits in one plate-like piece and bending both ends thereof. Can do.

  The upper mounting piece 9 and the lower mounting piece 10 are preferably formed in the same shape. In this case, the lower mounting piece 10 can be used with the upper mounting piece 9 upside down. Thereby, the attachment pieces 9 and 10 become one type, and the number of parts is reduced, thereby reducing the production cost.

Next, an example of a process for attaching the column cover 3 to the column 2 will be described.
As shown in FIG. 4, the upper attachment piece 9 and the lower attachment piece 10 are inserted into each other with a slit 9 a, 10 a and loosely intersected in a substantially cross shape to obtain an assembly of the attachment hardware 1. One corner n of the assembly is brought into contact with and fixed to the corner 5a of the support column 2. That is, as shown in FIG. 5, the upper mounting piece 9 and the lower mounting piece 10 are respectively along the first outer surface 4a and the second outer surface 4b of the support column 2, and the bolts B1 and B1 are passed through the through holes r. It is fixed to the column 2.

  In the mounting hardware 1 attached to the corner portion 5a of the support column 2, the corner portion 5a makes a right angle, so the upper mounting piece 9 and the lower mounting piece 10 are perpendicular to the corner portion 5a from the loosely fitted state. The position is fixed so that it intersects. The mounting hardware 1 is preferably provided at a predetermined pitch in the height direction of the support column 2.

  Next, as shown in FIG. 5, in this embodiment, a wooden base for attaching the corner pieces 3 a of the pillar cover 3 to the attachment surfaces 13, 14 of the side plate portions 9 c, 10 c of the attachment pieces 9, 10. The material 18 is attached with a tapping screw B2 or the like. The base material 18 is made of a strip-shaped thin plate material, and is arranged in accordance with the gap between the mounting surfaces 13 and 14 and the inner peripheral surface of the column cover 3 (shown in FIG. 2). Used). Such a base material 18 is suitable for filling the gap between the column cover 3 made of gypsum board or ceramic material and the mounting surfaces 13 and 14 and mounting the column cover 3 stably.

  It should be noted that a reference line 17 extending in the vertical direction is provided on the mounting surfaces 13 and 14 of the present embodiment so that they can be confirmed with the naked eye so that the horizontal position of the base material 18 relative to the mounting surfaces 13 and 14 can be easily determined. On the other hand, the base material 18 is provided with viewing holes 18a made up of small holes through which the reference line 17 can be seen at a predetermined pitch at positions to be aligned with the reference line 17. Therefore, when the base material 18 is attached to the attachment surfaces 13 and 14, the base material 18 is correctly positioned by being aligned with a position where the reference line 17 can be seen from the peep hole 18 a and is fixed to the attachment surfaces 13 and 14. At this time, the peep hole 18a can be used as a pilot hole for the tapping screw B2. This prevents the base material 18 from being displaced in the horizontal direction with respect to the mounting surfaces 13 and 14, and thus helps to stably mount the column cover 3 described later.

  Further, as shown in FIG. 2, in this embodiment, the column cover 3 is arranged such that the center of the column cover 3 is displaced from the corner portion 5 a of the column 2 toward the column 2 (inside the column 2). . Therefore, the mounting pieces 9, 10 are eccentric from the center lines C1, C2 of the pillar cover 3, and the side plate portions 9c, 10c of the mounting pieces 9, 10 are respectively connected to the center line from the main plate portions 9b, 10b. It is bent toward the C1 and C2 sides (the column 2 side). Accordingly, the attachment surfaces 13 and 14 of the side plate portions 9 c and 10 c form a support surface that extends across the center lines C <b> 1 and C <b> 2 of the column cover 3. Such mounting surfaces 13 and 14 can stably hold the base material 18 extending so as to intersect the center lines C1 and C2. Accordingly, the reference line 17 is provided at the position of the center line C1 or C2, and by providing a peep hole 18a at the center of the width of the base material 18, the base material 18 is moved to the center line C1 or C2. Therefore, it can be arranged symmetrically with good balance.

  Next, as shown in FIG. 2, the corner piece 3a of the pillar cover 3 is fixed to the base material 18 with screws B3 or the like. In this embodiment, both end portions 3a1, 3a1 of the corner piece 3a are fixed to the base material 18, respectively. A small gap is formed between the adjacent corner pieces 3a, 3a, and the caulking material 20 is disposed in the small gap to be watertight.

  As described above, the mounting hardware 1 of the present invention is fixed to the support column 2 by inserting the slits 9a and 10a of the upper and lower mounting pieces 9 and 10 into each other at the construction site so as to loosely cross in a substantially cross shape. The The mounting hardware 1 is fixed to the support column 2 so that the upper mounting piece 9 and the lower mounting piece 10 are finished at a right angle without any play. Therefore, the mounting hardware 1 of the present invention is excellent in productivity because it is not necessary to weld and fix a pair of mounting pieces in advance in a factory or the like as in the prior art.

  Moreover, since such an attachment hardware 1 can be conveyed from a factory to a construction site, for example, as shown in FIG.

  Further, in the mounting hardware 1 of the present invention, since the mounting surfaces 13 and 14 of the four column covers 3 can be provided around the column 2 as in the prior art, the mounting surfaces 13 and 14 are used to attach the column 2 to the column 2. The column cover 3 can be attached stably and does not require complicated processes and operations.

7A and 7B are sectional views of other embodiments of the mounting hardware 1 of the present invention.
In this embodiment, the upper mounting piece 9 includes a rectangular upper fin 9e that is bent in an opposite direction to the bent piece 15 at the upper edge 9y of the main plate portion 9b. Further, the lower mounting piece 10 includes a rectangular lower fin 10e that is bent in a direction opposite to the bent piece 16 at the lower edge 10x of the main plate portion 10b.

  The upper mounting piece 9 and the lower mounting piece 10 having the upper and lower fins 9e and 10e increase the bending rigidity of the mounting pieces 9 and 10 and are excellent in durability. This can effectively prevent deformation of the mounting pieces 9 and 10 during conveyance. Further, as shown in FIG. 8, the mounting hardware 1 provided with the upper and lower fins 9e and 10e has only one corner portion formed by the main plate portions 9b and 10b capable of contacting the corner portion 5a of the support column 2. not exist. Accordingly, since the mounting position of such mounting hardware 1 is uniquely determined, it is possible to prevent mistakes in the mounting direction and improve workability.

FIG. 9 further shows another embodiment of the present invention.
In this embodiment, the upper mounting piece 9 has an upward slit 9a and a plurality of downward slits 10a (in the present embodiment, two each). According to this embodiment, the cross shape formed by the upper mounting piece 9 and the lower mounting piece 10 can be easily changed simply by changing the insertion positions of the upward slits 9a1, 9a2 and the downward slits 10a1, 10a2. . Specifically, it is possible to change the distance from the corner n to be brought into contact with the corner portion 5a of the support column 2 to the mounting surfaces 13 and 14 of the side plate portions 9c and 10c. Therefore, in such a mounting hardware 1, as shown in FIG. 10, the position of the column cover 3 with respect to the column 2 can be changed. Therefore, such a mounting hardware 1 can change the arrangement position of the column cover 3 with respect to the same column 2 to give a width to the planning, and even when the column 2 has a different cross-sectional shape, 3 can be formed at the same position, and versatility is improved.

  The reference surfaces corresponding to the positions of the plurality of slits are provided on the mounting surfaces 13 and 14 of the upper mounting piece 9 and the lower mounting piece 10 in which the plurality of upward slits 9a and the downward slits 10a are thus formed. The number of lines 17 (17a and 17b in this embodiment) is preferably the same as the number of slits.

  As shown in FIG. 10, when the support column 2 has a square tube shape with a closed cross section, the mounting hardware 1 cannot be used with the bolt B <b> 1 and the nut, and is fixed by the screw B <b> 5. As shown in FIG. 3, it is desirable that a screw hole 19 is formed in advance in the main plate portions 9b and 10b so that the main plate portions 9b and 10b can be easily fixed to the outer surface 4 of the support column 2.

  As mentioned above, although the especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Pillar cover mounting hardware 2 Pillar 3 Pillar cover 4 Outer surface 4a First outer surface 4b Second outer surface 5 Corner portion 9 Upper mounting piece 9a Upward slit 9b, 10b Main plate portion 9c, 10c Side plate portion 10 Lower mounting piece 10a Downward Slit 13, 14 Mounting surface of side plate

Claims (7)

A mounting bracket for attaching a cylindrical column cover that is spaced apart from the column and surrounds the column to a column having at least one corner portion in which the first outer surface and the second outer surface extending in the vertical direction are orthogonal to each other. And
The mounting hardware includes an upper mounting piece having an upward slit extending vertically from bottom to top;
Including a downward slit extending vertically from top to bottom and inserting the downward slit into the upward slit, and including a lower mounting piece that loosely intersects with the upper mounting piece in a substantially cross shape,
One corner formed by the substantially cross-shaped upper mounting piece and the lower mounting piece is brought into contact with a corner portion of the column, and the upper mounting piece and the lower mounting piece are the first outer surface of the column and Affixed to the second outer surface,
The upper mounting piece and the lower mounting piece are fixed to the outer surface of the column so that the plate-shaped main plate portion extends to the both sides in the horizontal direction along the outer surface;
An attachment hardware for a pillar cover, comprising a pair of side plate parts provided at both ends in the horizontal direction of the main plate part and having attachment surfaces to which the pillar cover is attached.   The column cover mounting hardware according to claim 1, wherein the upper mounting piece and the lower mounting piece have the same shape, and the lower mounting piece is used upside down with respect to the upper mounting piece.   3. A column cover mounting bracket according to claim 1, wherein the pair of side plate portions of the upper mounting piece and the pair of side plate portions of the lower mounting piece are formed of bent pieces bent at an angle of 90 ° from the main plate portion. .   The column cover mounting hardware according to claim 3, wherein the bent piece of the upper mounting piece and the bent piece of the lower mounting piece are bent in the same direction with respect to each main plate portion. The upper mounting piece has an upper fin that bends in the opposite direction to the bent piece at the upper edge of the main plate portion, and the lower mounting piece is opposite to the bent piece at the lower edge of the main plate portion. The mounting hardware for a pillar cover according to claim 4, further comprising a lower fin that bends in a direction.   The pillar cover according to any one of claims 1 to 5, wherein a through hole is formed in the main plate portion of the upper mounting piece and the main plate portion of the lower mounting piece, through which a bolt for fixing to the column is passed. Mounting hardware.   The pillar cover mounting hardware according to any one of claims 1 to 6, wherein a plurality of upward slits and a plurality of downward slits of the lower mounting piece are formed.

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