JP2000291611A - Fixing structure fixing signboard on square column and sheet metal used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for fixing a fixed object provided between a square column and sheet metals by opposing two sheet metals in the front and rear of the square column so as to sandwich the square column and tightening them by a bolt from the right and left. SOLUTION: Both end parts of each sheet metal 2 (2a, 2b, 2c, 2d) are bent in the same direction at an angle of 45 degrees on the outside, bolt holes are drilled in bent parts at both ends, and four sheet metals 2 are assembled like a well curb so as to surround a square column 1 from four sides by a bolt 3 inserted into the bolt holes and are mutually tightened at four corner parts of the square column 1. A fixed object 5 provided between the square column 1 and the sheet metals 2 is fixed on the square column 1 by tightening the bolt. Two opposing sheet metals pull each other through the bolt 3 to be tightened in a tightening part in a condition in which they are tightened by the bolt 3. An interval between the sheet metals 2 adjacent in the tightening part is adjusted to correspond to the column having a diameter of a fixed scope.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing bracket used for fixing a signboard, a sign and the like to a prism.

[0002]

2. Description of the Related Art When a signboard or the like is fixed to a column, if the column is a column, the metal band is turned along the outer periphery of the column, and an attempt is made to fix the column between the column and the metal band. A pole that can be erected alone, such as a telephone pole that has been widely used as a method of fixing an object to be fixed directly or by sandwiching a support bracket dedicated to the metal band and tightening the metal band, is almost always a circular column. However, when the column is used as a structural material by assembling a horizontal member to the column, a prism having a quadrangular cross-section is easier to process the joint portion than a cylinder, so a prism is often used.

However, in the case where the pillar is a prism, the fastening force of the metal band concentrates only on the corner in the method used in the case of the cylinder, and the corner of the pillar deforms and becomes round after a long period of time. However, there is a disadvantage that the metal band is loosened and the fixing is incomplete. Also, since the metal band is bent at a right angle at the corner, a large bending deformation occurs at the corner of the metal band,
There is also a disadvantage that the metal band is easily broken at that portion. Therefore, when the pillar is a prism, it is usually necessary to use FIG.
The clamps or square pads shown in FIG.

[0004]

In the case of the metal fitting shown in FIG. 3, two metal plates are opposed to each other so as to sandwich a prism (hereinafter, also simply referred to as a column), and are fastened with bolts from the left and right sides. This is a method of fixing the fixed object 5 interposed between the metal plate and the sheet metal. According to this method, the fixing is loosened if the front and rear sheet metals are not fastened in parallel. That is, the pressing force concentrates only on the corners of the column or the corners of the fixed object 5, and the pressing force on the column surface is not uniform. In addition, even though it seems that the screw is tightened with a uniform pressing force at first glance, the pressing force is actually concentrated on the corners, and after a long period of time, the concentrated pressing force causes the column or the object 5 to be fixed. The corners may be rounded and the fixing force of the sheet metal may be reduced, resulting in incomplete fixing.

If the tightening force of the bolt is too large, the portion where the sheet metal is in contact with the column surface is curved, and a gap is formed between the plate and the column surface. As a result, the pressing force is concentrated only at the corners,
Again, the fixation may be incomplete as before. In order to equalize the pressing force of the leaf spring, the left and right bolts must be tightened alternately little by little and the left and right bolts must have the same tightening force.However, the degree of tightening depends on experience and intuition In addition, the work of attaching a signboard or the like is often performed at a high place, so that there is a problem that the work efficiency cannot be improved unless a person who has experience is used.

[0006] On the other hand, the method shown in FIG. 4 is a method in which a corner pad having a curved outer side is applied to a corner portion and tightened with a metal band from the outside. Since it is necessary to support each of the square pads 6 so as not to fall, there is a disadvantage that it is difficult to work alone by using a thick prism.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems. The present invention will be described with reference to the drawings of the embodiments. FIG. 1 is an explanatory diagram of a fixture according to an embodiment of the present invention. In the figure, 1 is a prism, 2 (2a, 2
b, 2c, 2d) are fastening metal plates, and each of the metal plates 2 is in contact with four surfaces of the prism 1 one by one. 3 is a bolt. Reference numeral 5 denotes an object to be fixed, for example, a brace supporting a signboard. The tip of the arm 5 is bent into an L-shape, and the tip bent into the L-shape is a prism 1 and a metal fitting 2.
Is inserted between.

Each sheet metal 2 (2a, 2ab, 2c, 2
In d), both ends are bent in the same direction, for example, at an angle of 45 degrees outward, and a bent portion (hereinafter referred to as a bent portion) at both ends is provided with a bolt hole, and is passed through the bolt hole. The four sheet metal members 2 are assembled in a girder-shape so as to surround the prism 1 from four sides by the bolts 3, and are mutually fastened at the four corners of the prism 1. A fixed object 5 interposed between the sheet metal 2 is fixed to the prism 1. In the state of being fastened by the bolts 3, the two opposing sheet metals are mutually pulled at the fastening portions via the bolts 3 for fastening them. FIG. 2 schematically shows the state.

In FIG. 2, for example, an adjacent sheet metal 2a
And 2b, the direction of the force F2a acting on the sheet metal 2a and the direction of the force F2b acting on the sheet metal 2b are opposite to each other, and the magnitudes of the forces are equal. The sheet metal 2 tightened with the bolt 3 even at the bent portion of the other sheet metal 2
Are opposite in direction to each other and have the same magnitude. If the forces acting on the sheet metal 2 are divided into component forces parallel to the column surface indicated by the dotted line, the vector sum of the component forces is zero, and the four surfaces of the prism 1 have pressing forces of almost the same magnitude. Working. As described above, if the absolute value of the force acting on the bent portion of each sheet metal 2 is made substantially the same,
Are fastened with substantially the same pressing force by the four sheet metals 2, so that the fixed object 5 is firmly fixed to the column surface.

However, the absolute values of the magnitudes of all the component forces are not always substantially the same. XX ′ and YY ′ passing through the center O of the cross section formed by the column 1 and the object 5
On the other hand, if the four sheet metals 2 are located at symmetrical positions,
The absolute values of the magnitudes of all the component forces are substantially the same, and the tensile forces acting on the four bolts 3, that is, the absolute values of the forces acting on the bent portions of each sheet metal 2 also become the same. Since the thickness of the fixed object 5 is usually sufficiently smaller than the diameter of the column 1, it is usually sufficient to tighten each sheet metal 2 symmetrically with respect to the center of the prism 1. That is, the sheet metal 2 may be tightened so that the center of the four sheet metals 2 is located at the center of the pillar surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention is characterized in that four sheet metals 2 are used to tighten four surfaces of a prism 1 with substantially the same pressing force. And each sheet metal 2
If the central part of the length is in contact with the substantially central part of the column surface, the four surfaces of the prism 1 will be pressed with substantially the same pressing force.
Even if the four surfaces of the column 1 are pressed with substantially the same pressing force, if the pressing force is concentrated on the corners or the like on each column surface, the fastening by the sheet metal 2 may be loosened. , The pressing force must be substantially uniform.

For this purpose, the following points must be taken into consideration regarding the bending rigidity and shape of the sheet metal 2. When the bent portion of the sheet metal 2 is tightened with the bolt 3 with a predetermined force, the sheet metal 2 cannot be sufficiently tightened if it is easily bent and deformed at a bending corner. It must have sufficient rigidity for a given tightening force. However, if the bending rigidity is high enough to cause no or almost no bending deformation even when a predetermined tightening force is applied, not only excessive performance, but also heavy weight is required, and high places such as signboards and sign installation work are required. In work, work efficiency is reduced.

Therefore, it is desirable that the sheet metal 2 be made of a material that causes a slight bending deformation under a predetermined tightening force. When a sheet metal of such a material is used, if bending deformation occurs at a bending corner, the sheet metal 2 naturally also has a concave shape at the center of the sheet metal 2. Therefore, as shown in FIG.
It is desirable that the central portion of the rim contacting the column surface be slightly concavely curved. When the central portion of the sheet metal is slightly concavely curved with respect to the pillar surface as described above, the curved sheet metal 2 becomes straight when both ends of the sheet metal 2 are tightened with the bolts 3, and the sheet metal surface is bent. Comes into contact with the column surface uniformly, and the pressing force becomes almost uniform. The degree to which the sheet metal 2 is bent can be determined immediately by experimenting with the same sheet metal 2 used for practical use. The cross-sectional shape of the sheet metal 2 is a thick hollow structure in the case of FIG. 1, but may be a flat sheet metal or a sheet metal of another cross-sectional shape.

If the dimensions of the four metal plates are the same and the bending angle of the metal plate 2 is set to about 45 degrees, even if the prism 1 has a smaller diameter than that shown in FIG. In the above, the interval between the adjacent sheet metals 2 is large in the case of a large-diameter prism, and small in the case of a small-diameter prism. However, since they remain almost parallel to each other, the diameter of the prism 1 slightly changes. Even if it does, there is no problem in fastening by the bolt 3. However,
Since the sheet metal 2 has high rigidity so as not to cause any or almost no bending deformation even when a predetermined tightening force is applied, as described above, if the sheet metal 2 is previously curved, It is necessary to increase the bending angle by the amount of the bending.

Next, a procedure for fixing the object 5 to the prism 1 with the fastening metal plate 2 of the present invention will be described. First, the dimensions of the four sheet metals are made the same, and of the four sheet metals 2, three adjacent ones are connected in a “U” shape with three bolts, and a prism 1 is formed.
And wrap it around. Next, the fourth bolt is passed through the hole, the four sheet metals are assembled in a cross-girder shape, and the fixed object 5 is inserted between the sheet metal 2 and the prism 1 so that the sheet metal 2 and the fixed object 5 do not drop. Lightly tighten bolt 3 with a nut.
When the sheet metal 2 and the object 5 are temporarily fixed to the prism 1, attention is paid to the sheet metal 2a, and the interval between the bent portion of the sheet metal 2a and the bent portion of the sheet metal 2b is equal to the interval between the bent portion of the sheet metal 2a and the bent portion of the sheet metal 2d. Tighten the bolt 3 so that it is almost equal to

Next, paying attention to the metal plate 2c, the bolt 3 is tightened so that the interval between the bent portions of the metal plate 2c and the metal plate 2b is substantially equal to the interval between the bent portions of the metal plate 2c and the metal plate 2d. Further, the tightening of the four bolts is adjusted so that the intervals between the bent portions of the sheet metal 2 at the four corners are substantially the same. In this case, the distance between the plate 2a and the metal plates 2b and 2d is equal to the thickness of the fixed object 5, and
c and the distance between the metal plates 2b and 2d, but if the thickness of the fixed object 5 is sufficiently smaller than the diameter of the prism 1,
The difference is negligible. When the thickness of the fixed object 5 is, for example, 1/4 or more of the diameter of the column and is not negligible compared to the diameter of the column, when assembled in a cross-girder shape, they face each other so that the cross-girder becomes rectangular. The sheet metal may have the same dimensions and the dimensions of adjacent sheet metals may be changed.

When using a sheet metal that has been slightly curved in advance, it is sufficient to tighten the four sheet metals 2 so as to be in close contact with the pillar surfaces. That is, if the sheet metal 2 is in contact with the prism at the corner of the prism 1, the pressing force of the sheet metal 2 should be applied to the center of the column surface by the spring effect of the sheet metal 2.
However, care must be taken when the sheet metal 2 is bent in the opposite direction when excessively tightened, and the pressing force is concentrated only on the corners and the pressing force is not applied to the center of the column surface. Excessive tightening breaks the parallel relationship between the bent portions of the sheet metal 2 at the corners, so that it is immediately apparent from the state of the corners. Similarly, when the tightening force is insufficient, the sheet metal
Since the parallel relationship between the bent portions is lost, attention to the corners can prevent insufficient tightening and excessive tightening of the bolts 3 and, at the same time, allow the sheet metal 2 to abut against the column surface with substantially uniform pressing force. .

As described above, since the sheet metal 2 is slightly curved in advance by utilizing the spring effect of the sheet metal 2, a sheet metal material having a spring effect is naturally used, and the sheet metal is straightened from the curved state. The deformation up to the state is set so as to be within the elastic limit of the sheet metal 2. If this is not done, permanent deformation occurs, and uniform pressing force cannot be expected on the pillar surface. Needless to say, the fastening of the sheet metal 2 is not limited to bolts and nuts, but may be other screw means such as thumb screws.

[0019]

By adjusting the interval between the adjacent sheet metals 2 at the tightening portion, it is possible to cope with a column having a certain diameter. Since the pillars are pressed from four peripheral surfaces by the sheet metal 2 integrated by the bolts 3, the sheet metal 2 can be firmly fixed to the pillars, and therefore, the fixed object 5 such as a signboard support bracket can also be firmly fixed to the prism 1. Furthermore, work at high places, such as mounting a signboard, can be performed alone.

[Brief description of the drawings]

FIG. 1 is an explanatory view for attaching an object to be fixed to a prism using the metal fitting of the present invention.

FIG. 2 is an explanatory view for attaching a fixed object to a prism using the metal fitting of the present invention.

FIG. 3 is an explanatory diagram of a conventional technique.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 prism 2a sheet metal 2b sheet metal 2c sheet metal 2d sheet metal 3 bolt 5 fixed object 6 square contact

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshihiro Takimoto 1-3-1505, Pulp-cho, Asahikawa-shi, Hokkaido

Claims (2)

[Claims] 1. A fixing structure for fixing an object (5) such as a signboard, a sign, etc. to a prism (1), wherein four sheet metal members whose both ends are bent at an angle of about 45 degrees in the same direction. 2
a), (2b), (2c), and (2d), and four bolts (3), wherein the four sheet metals are bent at both ends, and a bolt hole is formed at each end. (3) is passed through, and four sheet metal members are assembled in a cross-girder shape so as to surround the prism from four sides, and the above-mentioned bolts are tightened to fix the fixed object (1) interposed between the prism (1) and the sheet metal ( 5)
Fixing structure to fix the prism to the prism (1). 2. The sheet metal according to claim 1, wherein a portion of the prism (1) in contact with the column surface is slightly concavely curved.