JP4047570B2 - Corner joint of square tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint for forming a corner portion of a square tube, and particularly to a joint for connecting two square tubes to each other at an arbitrary angle to form a corner portion.
[0002]
[Prior art]
Conventionally, in order to form a corner portion of a square tube, there is a method of bending a single square tube into a corner portion, but there is a disadvantage that the tube shape is deformed at the bent portion. On the other hand, in the case of a method in which two square tubes are connected by welding or the like and formed at the corner portion, as shown in FIG. 8, when the butted end portions 51 and 51 of both the square tubes 50 and 50 are butted, Cut the butt end portions 51 and 51 of both angle tubes in advance at an angle ½ of the arbitrary angle α so that the tubes 50 and 50 have an arbitrary angle α (α = obtuse angle, right angle, acute angle), These cut end faces were brought into contact with each other, and then, in order to maintain this contact state, both the square tubes were fixed with a dedicated jig and then joined by welding or the like.
[0003]
For this reason, in the above-described conventional method of butting the two square tubes 50, 50, it is necessary to cut the butt end portion 51 of each square tube 50 in advance to an arbitrary angle α / 2, and the connecting portion. In order to perform welding, the butt is firmly fixed with a jig, and then fixed by welding, etc., so that the work such as holding and welding requires time and skill. there were.
[0004]
Thus, a device as disclosed in Japanese Utility Model Laid-Open No. 55-56876 has been proposed. This has an arbitrary angle of a tubular core body having an outer diameter that is the same as the inner diameter of the abutting tube on both side surfaces of the abutting member having the same diameter as that of the tube that abuts and abuts the end portion. In this case, a square tube that contacts the joint is inserted into the abutting member, and the square tube and the joint are bolted to form a corner portion. By the way, in the technique disclosed in this publication, the core portion must be accurately fixed and integrated in advance on both surfaces of the abutting member, which has a disadvantage that requires skill.
[0005]
[Problems to be solved by the invention]
The present invention eliminates the inconveniences described above in a joint having an arbitrary angle used for connecting corner tubes to form a corner portion having an arbitrary angle, and quickly turns the corner portion of the square tube to an arbitrary angle. And it is providing the corner joint of the square tube which can be assembled easily.
[0006]
[Means for Solving the Problems]
The means of the present invention for solving the above-mentioned problem is that, in the invention of claim 1, in the corner joint 1 that connects the two square tubes 30, 30 to form a virtual corner 18 of an arbitrary angle α, One side surface disposed between two horizontally symmetrical and congruent trapezoidal surfaces 3, 3 and two lower trapezoidal surfaces 3, 3 above and below the lower bases 4, 4 of the two horizontal surfaces arranged opposite to each other in the vertical direction. The upper bottom side vertical surface 7 and the upper and lower upper bases 5 and 5 of the two trapezoidal surfaces 3 and 3 are composed of four surfaces, one upper bottom side vertical surface 8 and left and right opening portions 9. The corner joint 1 of the square tube 30 is formed of a trapezoidal square tubular joint 2 having a straight square guide 20 fitted into the joint 2 and the square tubes 30, 30.
[0007]
In the invention of claim 2, the trapezoidal rectangular tubular joint 2 has the shape of the opening 9 congruent with the shape of the opening 31 of the connecting square tube 30. The square tube 30 of the means of claim 1 characterized by the above-mentioned. Of the corner joint 1.
[0008]
In the invention of claim 3, the trapezoidal square tubular joint 2 has the hypotenuse 6 and the lower base 4 of the trapezoidal surface 3 of the joint 2 when the angle of the virtual corner 18 of the connected square tubes 30, 30 is α. The size of the sine 10 with respect to the side 33 of the size between the outer surfaces of the connecting square tubes 30 at the angle α / 2 between the trapezoidal height 11 between the lower base 4 and the upper base 5 of the trapezoidal surface 3 of the joint 2 It is the corner joint 1 of the square tube 30 of the means of Claim 1 or 2 characterized by the above-mentioned.
[0009]
In the invention of claim 4, the trapezoidal rectangular tubular joint 2 and the straight rectangular guide 20 that is inserted into the rectangular tubes 30, 30 have a size between outer surfaces that are inserted into the connecting rectangular tube 30 in a tightened state. It has a length 23 between the length 22 and the outer surface , and has a length 24 that is the same as or shorter than the length 12 of the lower base 4 of the trapezoidal surface 3 of the trapezoidal rectangular tubular joint 2. It is the corner joint 1 of the square tube 30 of any one of Claims 1-3.
[0010]
In the invention of claim 5, the magnitude between the longitudinal 22 and the outer surface of the size between the outer surface of the straight prismatic guide 20 sized to be inserted in a clamped state on the size between the inner surfaces of the square tubes 30, 30 to be connected The square tube 30 of the means according to claim 4, characterized in that the lateral width 23 is the same as the longitudinal 15 of the size between the inner surfaces of the trapezoidal square tubular joint 2 and the trapezoidal height 17 of the size between the inner surfaces. Of the corner joint 1.
[0011]
The operation of the above means will be described.
In the means of claim 1, the corner joint 1 is formed of the trapezoidal square tubular joint 2 and the straight square guide 20 fitted into the joint 2 and the square tube 30. Since the pipe 30 is guided and fitted by the guide 20, it can be easily and quickly fitted to obtain the connecting pipe body 36 having the virtual corner 18 of an arbitrary angle α.
[0012]
In the means of claim 2, since the trapezoidal rectangular tubular joint 2 has the shape of the opening 9 congruent with the shape of the opening 31 of the connecting square tube 30, the size between the outer surfaces of the opening 9 of the joint. The vertical lengths 13 and 14 and the vertical lengths 15 and 16 between the inner surfaces are respectively the vertical lengths 32 and 33 between the outer surfaces of the opening 31 of the connecting square tube 30 and the vertical length 34 between the inner surfaces. When the square tube 30 to be connected is an opening 31 perpendicular to the tube axis, the shape of the opening 9 of the joint 2 is congruent to the shape of the opening 31. It is not necessary to cut the end of the tube 30 at a special angle, and a square tube cut at a right angle as usual can be used, and the joint 2 can be accurately connected only by abutment. Therefore, the work efficiency of connection is extremely high.
[0013]
In the means of claim 3, the trapezoidal rectangular tubular joint 2 has the hypotenuse 6 and the lower base 4 of the trapezoidal surface 3 of the joint 2 when the angle of the virtual corner 18 of the connecting square tubes 30, 30 is α. The trapezoidal height 11 between the lower base 4 and the upper base 5 of the trapezoidal surface 3 of the joint 2 is the size of the sine of the side 33 of the size between the outer surfaces of the connecting square tubes 30 with respect to the angle α / 2 between them. Therefore, the shape of the joint 2 can be determined by calculating the trapezoidal height 11 between the lower base 4 and the upper base 5 of the trapezoidal surface 3 from an arbitrary corner angle α, and the rectangular tube 30 can be determined as the arbitrary corner angle α. , 30 can be a joint 2 is easily formed to connect, and to use a joint 2 which is formed in this manner, the magnitude between the longitudinal 32 and the outer surface of the size between the outer surface of the square tubes 30 connected The same size without changing the size of the side 33 It is possible to form the connection tube body 36 having a virtual corner 18 of various arbitrary angle α by using square tubes 30, 30.
[0014]
According to the fourth aspect of the present invention, the trapezoidal rectangular tubular joint 2 and the straight rectangular guide 20 to be inserted into the rectangular tubes 30, 30 are arranged between the outer surfaces of a size to be inserted into the connecting rectangular tube 30 in a tightened state . The square tube 30 has a length 24 that is equal to or shorter than the length 12 of the lower base 4 of the trapezoidal surface 3 of the trapezoidal square tubular joint 2, and has a length 22 and a width 23. The guide tube 20 is inserted and inserted into the connecting tube body 36 which is tightened without looseness and integrated extremely firmly.
[0015]
According to the means of claim 5, the vertical 22 and the horizontal 23 having a size between the outer surfaces of the rectangular guide 20 having a size to be fitted between the inner surfaces of the connecting rectangular tubes 30 in a tightened state is a trapezoidal square tubular joint. 2 is the same as the length 15 and the trapezoidal height 17 between the inner surfaces of the two, the straight square guide 20 is also fastened with the trapezoidal square tubular joint 2 and, therefore, coupled with the means of claim 4, The two rectangular tubes 30 and 30 and the joint 2 are more firmly connected, and a connecting tube 36 having a corner portion with high rigidity is obtained.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a joint 2 and a guide 20 that form a corner joint 1 of the present invention, and two square tubes 30 and 30 to be connected. FIG. 2 is a perspective view showing a corner joint 1 formed by inserting a guide 20 into a joint 2 and two square tubes 30 and 30 to be connected. FIG. 3 is a perspective view showing a state in which one of the square tubes 30 is connected to the corner joint 1 and the other square tube 30 is connected to the corner joint 1. 4 schematically shows an imaginary corner 18 of the two square tubes 30 and 30 connected by the corner joint 1. FIG. 4A shows a case where the corner angle α is an obtuse angle, and FIG. 4B shows a case where the corner angle α is a right angle. (C) is a diagram showing a corner angle α having an acute angle. 5A and 5B are diagrams showing dimensions of the joint 2, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view. 6A and 6B are diagrams showing dimensions of the opening 9 of the joint 2 and the opening 31 of the square tube 30, and FIG. 6A is a view seen from the direction of the arrow shown in FIG. 5A, and FIG. FIG. 4 is a view seen from the side of the tube 30. 7A and 7B are diagrams showing the dimensions of the guide 20, wherein FIG. 7A is a side view and FIG. 7B is a front view. FIG. 8 is a perspective view for explaining a conventional method of forming a corner composed of the square tubes 50, 50 by butting.
[0017]
Referring to an embodiment of the present invention, a corner joint 1 has two square tubes 30 and 30 connected to both sides thereof so as to form a virtual corner 18 having an arbitrary angle α as shown in FIG. It is used to do. The corner joint 1 includes a trapezoidal square tubular joint 2 and a straight square guide 20. The corner joint 1 can be formed of iron, brass, other metal, or hard plastic as long as the connected square tube 30 can be connected firmly. If the same material as the square tube 30 is used, the connecting portion is not noticeable. Good.
[0018]
The trapezoidal rectangular tubular joint 2 is composed of a trapezoidal surface 3 and 3 composed of a lower base 4 and an upper base 5 which are opposed to each other while being spaced apart from each other, and a symmetrical oblique side 6, and the upper and lower trapezoidal surfaces 3 and 3. 4 surfaces of a long lower base vertical surface 7 disposed between the lower bases 4 and 4 and a short upper base vertical surface 8 disposed between the upper bases 5 and 5 of the upper and lower trapezoidal surfaces 3 and 3. It is made up of. The left and right sides of the four surfaces of the joint 2 are formed in the openings 9 and 9 in an opened state. On the other hand, the guide 20 has a rectangular shape that is inserted into the trapezoidal rectangular tubular joint 2 from the opening 9.
[0019]
As shown in FIG. 6, the size between the outer surfaces and the size between the inner surfaces as viewed from the front of the left and right openings 9, 9 of the trapezoidal rectangular tubular joint 2 of the corner joint 1 are respectively connected square tubes 30, 30. Are formed congruently with the same size as the size between the outer surfaces of the openings 31 and 31 and the size between the inner surfaces . Thus, the magnitude V of the vertical 13 size between the outer surface of the joint 2 is the same as the size V of the vertical 32 size between the outer surface of the square tubes 30 connected, the size between the inner surfaces of the joint 2 The size v of the vertical 15 is the same as the size v of the vertical 34 which is the size between the inner surfaces of the connected square tubes 30. Further, the size W of the magnitude of the lateral 14 between the outer surface of the joint 2 is the same as the magnitude W of the magnitude of the lateral 33 between the outer surface of the square tubes 30 connected, the size between the inner surfaces of the joint 2 The size w of the side 16 is the same as the size w of the side 35 of the size between the inner surfaces of the connected square tubes 30.
[0020]
Further, the trapezoidal height 11 of the joint 2 is a trapezoidal height 11 which is a distance between the lower base 4 and the upper base 5 of the joint trapezoidal surface 3. By the way, as shown in FIG. 4, when the two rectangular tubes 30 and 30 are connected so as to have a corner angle α, the angle between the hypotenuse 6 of the trapezoidal surface 3 and the lower base 4 is α / 2. Become. Accordingly, the size H of the trapezoidal height 11 that is the distance between the lower base 4 and the upper base 5 of the trapezoidal surface 3 of the joint 2 is the size of the sine 10 at the angle α / 2 of the size of the hypotenuse 6. On the other hand, as shown in FIG. 6, the size of the hypotenuse 6 is the size W of the side 14 between the outer surfaces of the opening 9 when the opening 9 of the joint 2 is viewed from the vertical, which is a square tube 30 to be connected. The width 14 between the outer surfaces of the opening 31 is W. Accordingly, the size H of the trapezoidal height 11 of the trapezoidal surface 3 of the joint 2 is calculated as Wsin α / 2. From this, as seen in FIG. 4, the size H of the trapezoidal height 11 when α is an obtuse angle is larger than the size H of the trapezoidal height 11 when α is a right angle, and when α is a right angle. The size H of the trapezoidal height 11 is larger than the size H of the trapezoidal height 11 when α is an acute angle .
[0021]
In this embodiment, the guide 20 to be inserted into the joint 2 has a U-shaped cross section as shown in FIG. 7, and the length v of the length 22 between the outer surfaces is the size between the inner surfaces of the joint 2. The size h of the side 15 of the size between the outer surfaces is the same as the size h of the trapezoidal height 17 of the size between the inner surfaces of the joint 2. Furthermore, the length L of the length 24 of the guide 20 is shorter than or the same as the length L of the length 12 of the joint 2. The shape of the guide 20 is not limited to the U-shape as long as the length and width are the same, and may be a cross-sectional H shape or other cross-sectional shapes. With the size described above, the guide 20 is tightly inserted into the joint 2 to form the corner joint 1, and the guide 20 protruding to the left and right of the corner joint 1 is within the size between the inner surfaces of the square tube 30. Similarly, when the square tube 30 is connected by the joint 2, there is no backlash between the two and the surface is formed flush with each other.
[0022]
The connection of the two square tubes 30 and 30 using the corner joint 1 of the said embodiment of this invention is demonstrated. As shown in FIG. 1, a guide 20 is fitted into the joint 2 in parallel with the lower bottom vertical surface 7 from one opening 9 of the joint 2 to form the corner joint 1, and the obtained corner joint 1 is shown in FIG. 2. Next, as shown in FIG. 3, the rectangular tubes 30, 30 are externally fitted to the left and right guides 20, 20 exposed outside the hypotenuse 6 of the joint 2 of the corner joint 1, and the opening 9 of the joint 2. The end of each corner tube 30 and the end of the opening 31 of each square tube 30 are butted to connect the surface of the joint 2 and the surfaces of the square tubes 30 and 30 in a flush manner, and connected to the virtual corner 18 state shown in FIG. This is a tube 36. Since the square tube is tightly fitted to the guide, the connection part is firmly connected only by this external fitting. To make the connection part stronger, it can be welded or bonded as appropriate, or with a bolt (not shown). It goes without saying that the guide portions of the square tube 30 and the corner joint 1 can be bolted.
[0023]
In addition, the square tube 30 connected by the corner joint 1 in the above embodiment can be a handrail or other connection pipe body 36. May be further a tube through which fluid inside the guide 20 in this case is to be inserted into the joint 2 of the corner joint 1, the U-shaped as shown in FIG. 7, the size between the outer surface of the U-shaped If the wall surface of the vertical 22 exists on the lower bottom side vertical wall 7 side of the joint 2, when the fluid flows through the connecting pipe body 36, the wall surface of the vertical 22 having a size between the outer surfaces of the guide 20 flows. It can pass through the corner without obstruction.
[0024]
【The invention's effect】
As described above, the present invention is a corner joint for forming a corner portion in a handrail or other tubular body made of a square tube, the corner joint is formed from a trapezoidal tubular joint and a guide inserted therein, A connecting tube with a strong corner that makes it easy to butt-join with the joint by externally fitting a square tube connected to the guide, and is simply tightened from the inside with the guide, so that the joint and the square tube are simply abutted. It is not necessary to hold the butt part with a special jig even when welding the butt part, and the joint butt end of the joint is changed by changing the trapezoidal height of the trapezoidal surface as a trapezoidal square tube Since the shape of the opening of the part can always be the same as the shape of the opening cut perpendicular to the longitudinal direction of the connected square tube, only the corner joint If it what form corners of species of angle, angular tube ordinary square tube simply cut perpendicularly in the longitudinal direction it can be used. Therefore, it is not necessary to cut the connecting end of the square tube at an oblique angle in advance, so that no skill is required for cutting and labor can be saved. Thus, the present invention provides an excellent effect that has never been achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a joint, a guide, and two square tubes to be connected in a disassembled state, forming a corner joint according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a corner joint formed by inserting a guide into a joint and two square tubes to be connected.
FIG. 3 is a perspective view showing a state immediately before one square tube is connected to a corner joint and the other square tube is connected to a corner joint.
FIG. 4 shows the corners of two square tubes connected by a corner joint, where (a) shows the corner angle α being an obtuse angle, (b) shows the corner angle α being a right angle, and (c) shows the corner. It is a figure which shows what the angle (alpha) consists of an acute angle.
5A and 5B are diagrams showing dimensions of the joint 2, in which FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view.
6A and 6B are views showing dimensions of the opening 9 of the joint 2 and the opening 31 of the square tube 30. FIG. 6A is a view seen from the direction of the arrow shown in FIG. 5A, and FIG. It is the figure seen from the side of a square tube.
7A and 7B are diagrams showing dimensions of the guide 20, in which FIG. 7A is a side view and FIG. 7B is a front view.
FIG. 8 is a perspective view for explaining the formation of a corner of a square tube by a conventional butt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Corner joint 2 Joint 3 Trapezoid surface 4 Lower base 5 Upper base 6 Oblique side 7 Lower base vertical surface 8 Upper base vertical surface 9 Opening 10 Sine 11 Trapezoid height 12 Length 13 Vertical size 14 External surface 15 between the inner surfaces 16 vertical between the inner surfaces 16 horizontal between the inner surfaces 17 trapezoidal height of the inner diameter 18 corner 20 guide 21 opening 22 vertical between the outer surfaces 23 vertical size between the outer surfaces Horizontal 24 Length 30 Square tube 31 Opening 32 Vertical length between outer surfaces 33 Horizontal size between outer surfaces 34 Vertical size between inner surfaces 35 Horizontal size between inner surfaces 36 Connection tube 50 Square tube 51 Butt end

Claims (5)

In the corner joint (1) that connects two square tubes (30) and (30) to form a virtual corner (18) of an arbitrary angle α, the horizontal upper and lower surfaces that are spaced apart from each other and face each other One surface arranged between two symmetrical trapezoidal surfaces (3), (3) and the two trapezoidal surfaces (3), upper and lower bottom (4), (4) of (3) And the upper and lower upper bases (5) and (5) of the two trapezoidal surfaces (3) and (3). 8) a trapezoidal rectangular tubular joint (2) having four sides and having openings (9) and (9) on the left and right sides, and a straight shape fitted into the joint (2) and the rectangular tube (30). A corner joint (1) of a square tube (30), characterized by being formed from a square guide (20) . The square tube according to claim 1, characterized in that the trapezoidal rectangular tubular joint (2) has a shape of an opening (9) congruent with the shape of the opening (31) of the connecting square tube (30). (30) Corner joint (1) . The trapezoidal square tubular joint (2) has a trapezoidal surface (3) of the joint (2) when the angle of the virtual corner (18) of the two square tubes (30) and (30) to be connected is α. The size of the sine (10) with respect to the side (33) of the size between the outer surfaces of the connecting square tubes (30) at the angle α / 2 between the hypotenuse (6) and the lower base (4) of the joint (2 The corner joint of the square pipe (30) according to claim 1 or 2, characterized in that the trapezoidal height (11) between the lower base (4) and the upper base (5) of the trapezoidal surface (3) . The trapezoidal rectangular tubular joint (2) and the rectangular guide (20) to be inserted into the rectangular tubes (30), (30) are arranged between the outer surfaces to be inserted into the connecting rectangular tube (30) in a tightened state. The length (12) of the lower base (4) of the trapezoidal surface (3) of the trapezoidal rectangular tubular joint (2) having the size (22) and the width (23) between the outer surfaces. The corner joint (1) of the square tube (30) according to any one of claims 1 to 3, wherein the corner joint (1) has the same or shorter length (24) . The length (22) between the outer surfaces and the width (23) between the outer surfaces of the straight rectangular guide (20) sized to be fitted between the inner surfaces of the connecting square tubes (30) in a tightened state. The square tube according to claim 4, characterized in that is the same as the length (15) between the inner surfaces of the trapezoidal square tubular joint (2) and the trapezoidal height (17) between the inner surfaces. (30) Corner joint (1) .

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