JP3527498B2 - Angle bracket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a general-purpose metal fitting used as a reinforcing member, a connecting member, a mounting member, a bracket, etc. in various structures. Based on its typical shape, it is called an angle fitting.

[0002]

2. Description of the Related Art Angle type metal fittings are widely used as a reinforcing member, a connecting member or a mounting member in a corner portion of various structures such as buildings and furniture, and as a bracket for mounting shelves and other structures on a wall surface. There is. Weight reduction of angle type metal fittings used for such applications,
From the viewpoint of cost reduction, it has been conventionally practiced to use a relatively thin metal plate and provide reinforcing ribs on the metal plate so as to have required strength and rigidity (for example, JP-A-11-
(See Japanese Patent No. 100921).

[0003]

However, the reinforcing ribs formed in the conventional angled metal fittings have a degree of forming a shallow recess by partially plastically deforming the metal substrate by pressing the metal plate by pressing. (Rib width to height ratio is 1
However, the reinforcement function may not be sufficient, and the shortage must be compensated by selecting a large plate thickness.

Therefore, the present invention provides an angle-shaped metal fitting having a shape suitable for forming, by deep drawing, a reinforcing rib having a height several times as large as its width. The challenge is to provide.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a two-faced substrate wall having a right angle or other predetermined angular relationship and an arc wall having a constant curvature for connecting both of them. In the angle-shaped metal fitting in which the substrate is formed by and the reinforcing ribs are provided on the substrate on the two surfaces of the substrate, the reinforcing rib rises on the surface of the substrate by deep drawing from the back side of the substrate. Both side walls,
It is formed in a hollow shape consisting of ridges formed between the upper ends of both side walls, and the ridges are the lowest at both ends of the reinforcing ribs present on the above-mentioned two sides of the substrate wall, respectively, and the middle from the both ends. A configuration is adopted in which the height gradually increases as it reaches the portion, and the curvature is smaller than that of the arc wall as a whole.

The term "right angle or other predetermined angular relationship" includes not only the so-called angle shape in which the two wall surfaces of the substrate are in a right angle position, but also the obtuse angle or an acute angle. It is a concept. Further, the center of the radius of curvature in the case of "curvature" exists in the space sandwiching the above angle that defines the positional relationship between the two substrate wall surfaces.

In the angle-shaped metal fitting having the above structure, the reinforcing rib is formed by bending over the entire length thereof, and the drawing ratio is the largest in the central portion in the length direction, and gradually decreases in an arc shape along the both ends. ing. Since the curvature changes in an arc shape as described above, the change in the inclination angle is smaller than that of a linear reinforcing rib (for example, a linear rib whose ridge line is inclined at 45 degrees with respect to the substrate wall surface). Therefore, there is an advantage that wrinkles and tears do not easily occur during deep drawing, and smooth deep drawing can be performed.

Further, the above-mentioned reinforcing ribs are provided in parallel at two places, and a starting point is provided at an intermediate portion between each end of each reinforcing rib and each end of the arc wall on the substrate between both reinforcing ribs. An intermediate arc wall gradually rising from the starting point is formed, and the curvature of the intermediate arc wall can be set to an intermediate size between the curvatures of the arc wall of the substrate and the reinforcing ribs. In this way, by providing the reinforcing ribs at two places, the strength and rigidity thereof are doubled as compared with the case where they are provided at one place. In this case, the substrate part between both reinforcing ribs is
In the deep drawing process, since the raw material metal of that part is drawn in to both sides due to the forming of the reinforcing ribs on both sides, it becomes a part where breakage easily occurs, but in the present invention, in the present invention, the intermediate arc wall having the intermediate curvature. Since the height of the inner wall of each reinforcing rib becomes lower than the height of the outer wall of the reinforcing rib, the amount of drawing is reduced accordingly, and stable deep drawing can be performed in which breakage is unlikely to occur.

Further, mounting holes are provided between each end of the reinforcing ribs and the edge of the substrate, and at the starting point of the rising of the intermediate arc wall, and any of these mounting holes bulges toward the substrate surface side. It is possible to adopt a configuration in which the peripheral edge is folded back to the back surface side of the substrate and the folding end is formed to be the same as or slightly protruded from the back surface of the substrate. The mounting holes provided at the starting point of rising of the intermediate arc wall fix both ends of the intermediate arc wall to the mating member. Further, the folded end of the inner peripheral edge of the mounting hole is pushed out to the back surface side by a screw or the like inserted in the mounting hole and bites into the mating member.

When reinforcing ribs are provided at two places,
To show the relative size of the reinforcing ribs to the substrate,
As an example of the ratio of the sizes of the respective parts, the width a of the reinforcing rib,
The ratio of the width b of the substrate, the maximum height c of the ridge, the width d of the intermediate arc wall, and the maximum height e of the intermediate arc wall is about 1: 6: 6: 2: 2.

It is to be noted that a configuration is adopted in which four sides of the substrate are provided with wrap-around reinforcing edges, the wrap-around reinforcing edges are bulged toward the front side of the substrate, and the back side is flush with the back side of the substrate. Then, the strength and rigidity of the entire metal fitting can be further improved by the entangled reinforcing edge.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The angle fitting of the first embodiment shown in FIGS. 1 to 6 is formed by bending and deep-drawing a single steel plate, and the substrate 1 has two surfaces having a right angle positional relationship. Substrate walls 2, 3 and a constant curvature (curvature radius R in FIG. 3A) that connects both substrate walls 2, 3
₁ )).

Reinforcing ribs 5 and 5 of the same length are provided in parallel at two positions in the length direction of both of the above-mentioned substrate walls 2 and 3 and the arc wall 4 between them in the longitudinal direction thereof. Each reinforcing rib 5 is formed by deep drawing from the back surface side of the substrate 1, and an intermediate arc wall 7 is provided between both reinforcing ribs 5 and 5. Intermediate arc wall 7
Is formed so as to have a curvature smaller than the arc wall 4 (the reciprocal of the radius of curvature R ₂ shown in FIG. 3A), as shown in FIG. 3A.

As shown in FIG. 3 (b), each of the reinforcing ribs 5 has an outer wall 8 rising from the substrate 1, an inner wall 9 rising from the intermediate arc wall 7, and outer walls of these. 8 and inner wall 9
And a ridge portion 11 having an arcuate cross section formed between the upper ends of the reinforcing ribs 5, the inside of each reinforcing rib 5 is hollow, and is open to the back surface side of the substrate 1.

Both ends 12, 13 of each of the reinforcing ribs 5 are located on the substrate walls 2, 3 respectively, and the outer wall 8 and the inner side wall 9 are lowest at the ends 12, 13 respectively, and the reinforcing ribs 5 are gradually increases symmetrically accordance reaches the middle portion in the longitudinal direction, the ridge 11 as a whole, to have a smaller curvature than the intermediate arcuate wall 7 of the (reciprocal of the radius of curvature R3 of FIG. 3 (a)) Is formed.

In addition, the reinforcing edges 14 are formed on the four side edges of the substrate 1 over the entire circumference and are pressed flat (see FIGS. 3A and 3B). As shown in FIG. 3 (b), the back surface of the roll-in reinforcing edge 14 is flush with the back surface of the substrate 1 and is in close contact with the mounting surface 15. However, the entrainment reinforcement edge 14 may be omitted as shown in FIG.

As shown in FIG. 4, the above-mentioned substrate wall portions 2, 3 are formed.
At each of two outer mounting holes 16, 16 and 1
Internal mounting holes 17 are provided at the points. Outside mounting hole 1
Reference numerals 6 and 16 are provided between the end portions of each reinforcing rib 5 and the end sides of the substrate wall portions 2 and 3, respectively.
7 is the above-mentioned intermediate arc wall 7 in the middle of both reinforcing ribs 5.
End portions of the rising edge, that is, the starting points 18 and 18 (see FIG.
(See (a)). The outer mounting hole 16 is formed by burring the inner peripheral edge 19 so as to bulge on the surfaces of the substrate walls 2 and 3, and the inner peripheral edge 19 is folded back inward, and the folded end 21 is folded back to these wall portions 2, 3. Provided on the same surface as the back surface of 3 or slightly protruding. It is desirable that the folded end 21 be formed to be sharp.

Further, the inner mounting hole 17 is also provided with the inner peripheral edge 19 bulging toward the front surface side. In this case, the front end portion of the inner peripheral edge 19 is wound and bent on the rear surface side of the substrate. The inner peripheral edge 19 of each of the mounting holes 16 and 17 described above is machined so that the surface side is flat, and forms a screw or bolt tightening seat.

The angle fitting of the first embodiment has the above-mentioned structure, and FIG. 6 (a) shows a shelf 2 as an example of use.
The case where it is used as the shelf receiving metal fitting 24 for supporting 3 is shown. In this case, one board wall surface 2 is arranged on the mounting surface 15 side, and the other board wall surface 3 is arranged on the lower surface side of the shelf 23 and fixed by screws 25. In addition to such applications, in the corners of various structures as building fittings,
It is used as a reinforcing metal fitting and a connecting metal fitting.

The size of the above angle-shaped metal fitting is variously selected according to the application, but an example of the ratio of each part is as follows. Width a of the reinforcing rib 5 (see FIG. 3B) Width b of the substrate 1 Maximum height c of the ridge portion 11 of the reinforcing rib 5 (see FIG. 3A) Width d of the intermediate arc wall 7 Intermediate arc wall 7 A: b: c: d: e = 1: 6: 6: 2: 2, the specific height of the substrate 1 is about 1.2 mm. Is about 43 mm. Further, in the illustrated case, the angle formed by the substrate walls 2 and 3 is 90 degrees, but other than this, the angle may be formed as an obtuse angle or an acute angle depending on the application.

As can be seen from the use state of FIG. 6 (a),
In this angle fitting, the vertical wall portions that most contribute to the increase in strength and rigidity are the outer wall 8 and the inner wall 9 of the reinforcing rib 5, which are shown by chain line hatching in FIGS.
Since the outer wall 8 occupies the entire width from the arc wall 4 to the ridge portion 11, it is clear that it functions most effectively in increasing strength and rigidity. On the other hand, the inner wall 9 is the intermediate arc wall 7
Since it occupies only the range from to the ridge 11, it is inferior to the outer wall 8.

However, it is important from another point of view to provide such an intermediate arc wall 7 between the inner side walls 9 of the two reinforcing ribs 5. That is, if a blank of a steel plate having a thickness of about 1.2 mm as described above is subjected to deep drawing and the reinforcing ribs 5 and 5 having the ratio as described above are attempted to be formed close to two locations, On the wall 8 side, the metal material necessary for the narrowing is sufficiently supplied from the blank, but the inner wall portion 9 cannot be sufficiently supplied. Therefore, if the inner side wall 9 is also formed to have the same height (depth) as the outer side wall 8, the inner side wall 9 is likely to be broken.

For this reason, in the present invention, by providing the intermediate arc wall 7, the drawing depth of the inner wall 9 is made shallow to prevent breakage. Further, by providing mounting holes 17, 17 at both ends of the inner side wall 9, that is, at the rising start points 18, 18 of the intermediate arc wall 7, and fixing to the mounting surface 15 at this position, the reinforcing action of the inner side wall 9 is ensured. I am trying to demonstrate it.

The point that the ridge 11 of each of the reinforcing ribs 5 and 5 is curved in an arc shape is that the straight ridge 1 is formed.
1 '(see FIG. 6 (d)) is advantageous in the following points.
That is, the inclination angle α of the ridge portion 11 ′ is constant over the entire length, but the inclination angle β of the ridge portion 11 gradually increases from zero when the half of the ridge portion 11 is viewed with reference to the substrate walls 2 and 3. However, even at the largest angle (the midpoint of the ridge 11), it becomes equivalent to the inclination angle α of the ridge 11 ′. This is ridge 1
In the case of 1, the change of the draw ratio is small when performing the drawing work, which means that the drawing work can be performed smoothly.

Next, in the case of the second embodiment shown in FIGS. 7 and 8, the reinforcing rib 5'is provided at one location in the central portion in the width direction of the substrate 1. The cross-sectional shape of the reinforcing rib 5 is shown in FIG.
As shown in (b), both side walls 8 ′ rise in a mountain shape from both side edges of the substrate 1, and a ridge portion 11 having an arcuate cross section is formed at the upper end. Other configurations are similar to those in the case of the first embodiment described above.

In addition, in the case of the third embodiment shown in FIGS. 9 and 10, the reinforcing rib 5'is provided at one central portion in the width direction of the substrate 1 of the second embodiment. In common with the case, the reinforcing ribs 5'in this case are the side walls 8 ',
8'is raised at a right angle, and a curved ridge portion 11 is formed in the upper half portion thereof, which is a difference. Other configurations are the same as those in each of the above-described embodiments.

[0027]

As described above, according to the present invention, since the reinforcing ribs are formed by bending over the entire length of the substrate, there is an advantage that wrinkles are unlikely to occur during deep drawing, and a blank breaks during processing. It is possible to manufacture a product that is free from wrinkles and wrinkles. When the reinforcing ribs are provided at two positions, the curvature of the intermediate arc wall between the reinforcing ribs is set to be smaller than the curvature of the arc wall of the substrate, so that the heights of the inner walls of the reinforcing ribs facing each other are increased. Is smaller than the height of the outer wall, the amount of drawing is reduced accordingly, and stable deep drawing can be performed.

Further, by providing a mounting hole at the starting point of rising of the above-mentioned intermediate arc wall and fixing to the mounting surface at this portion, it is possible to sufficiently exert the effect of reinforcement and rigidity improvement by the inner wall of each reinforcing rib. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 (a) is a front view of the above. (B) Side view of the above

FIG. 3A is a sectional view taken along line AA of FIG. (B) A cross-sectional view taken along the line BB of FIG.

FIG. 4 (a) is a front view of a modification example of the above. (B) Sectional drawing of the bb line of (a) figure (C) Sectional drawing of the cc line of (a) figure

FIG. 5 is a sectional view of another modification example of the above.

FIG. 6 (a) is a sectional view of the same use condition (B)-(d) Operation explanatory drawing same as the above.

FIG. 7A is a perspective view of a second embodiment. (B) Front view of the above (C) Side view of the above

8 (a) is a cross-sectional view taken along line AA of FIG. 7 (b). (B) Sectional drawing of the BB line of FIG.7 (c)

FIG. 9A is a perspective view of a third embodiment. (B) Front view of the above (C) Side view of the above

10 (a) is a sectional view taken along line AA of FIG. 9 (b). (B) Sectional drawing of the BB line of FIG.9 (c)

[Explanation of symbols]

1 substrate 2 board wall 3 board wall 4 arc wall 5, 5'reinforcing ribs 7 Intermediate arc wall 8 outer wall 8'side wall 9 Inner wall 11 Ridge 12 end 13 edge 14 Reinforcement edge 15 Mounting surface 16 Outside mounting hole 17 Inside mounting hole 18 Starting point 19 Inner periphery 21 Folded end 23 shelves 24 shelf brackets 25 screws

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Actual public Sho-28-9660 (JP, Y1) Actual public Sho-35-32374 (JP, Y1) Actual public Sho-29-14075 (JP, Y1) Actual public 8- 13805 (JP, Y1) S. 48-40569 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 1/38-1/61 A47B 96/06

Claims (4)

(57) [Claims] 1. A substrate is formed by two-sided substrate walls having a right angle or other predetermined angle relationship and an arc wall having a constant curvature that connects the two, and the substrate extends over the two-sided substrate walls. In angle-type metal fittings with reinforcing ribs , the reinforcing ribs with the same length should be flat at regular intervals.
It is provided in two places in a row, and an intermediate arc wall is provided between both reinforcing ribs.
And both ends of each of the above-mentioned reinforcing ribs are
Serial outer wall that rises substrate surface by In the substrate wall deep drawing from the back side of the substrate and the inner wall
And the cross section formed between the upper ends of these outer and inner walls
It is formed in a hollow shape consisting of arc-shaped ridges, and the ridges are the lowest at both ends of the reinforcing ribs present on the substrate wall, respectively, and gradually increase from both ends to the intermediate part as a whole. The curved wall has a curvature smaller than that of the circular arc wall, and the intermediate circular arc wall is a base between both the reinforcing ribs.
Intermediate of each end of each reinforcing rib on the plate and each end of the arc wall
Part has a rising origin and gradually rises from that origin
The inner wall of each of the reinforcing ribs is formed of an intermediate arc wall.
The part is formed by rising from the intermediate arc wall,
The curvature of the middle arc wall is the same as the curvature of the arc wall
Angle-shaped metal fittings characterized by having an intermediate size of the curvature of the ridge of the bump. 2. Between each end of the reinforcing rib and the edge of the substrate,
And mounting holes are provided at the starting points of the rising of the intermediate arc wall, and the inner peripheral edge that bulges toward the substrate front surface in any of these mounting holes is folded back toward the substrate back surface,
The angled fitting according to claim 1 , wherein the folded end is formed to be the same as or slightly protruded from the back surface of the substrate. 3. The ratio of the width a of the reinforcing rib, the width b of the substrate, the maximum height c of the ridge, the width d of the intermediate arc wall, and the maximum height e of the intermediate arc wall is about 1: 6: 6. 3: 2: 2, The angle type metal fittings of Claim 1 or 2 characterized by the above-mentioned. 4. A reinforced winding edge is provided on four sides of the substrate, and the reinforced reinforcing edge is bulged to the front side of the substrate and the back side is formed to be flush with the back side of the substrate. The angled metal fitting according to any one of claims 1 to 3 .