JP4848307B2 - Assembly and fixing structure of hollow square material - Google Patents

Description

  The present invention relates to an assembly fixing structure for fixing a structure obtained by bending and joining hollow square members to an assembled state.

  As an assembly structure of hollow square members, there are a bent structure in which one hollow square member is bent at a predetermined angle, a joined structure in which two hollow square members are joined in a T shape, and the like.

  Among these, Patent Document 1 is known as a bent structure. According to Patent Document 1, a notch is formed at a bending position of a hollow metal pipe, and the engagement protrusion and the engagement recess formed at the notch are engaged by bending the hollow metal pipe at the notch. An assembly structure in which the folded state is maintained is disclosed. Moreover, patent document 2 is known as a junction structure. In Patent Document 2, a plate-like protrusion is formed at the end of the first hollow shape member, an insertion hole is formed in the side surface of the second hollow shape member, and the plate-like protrusion of the first hollow shape member is formed in the second hollow shape. An assembly structure for inserting into a shape insertion hole is disclosed.

These conventional techniques perform positioning and temporary fixing to the assembly position in order to improve the assembly property of the hollow square member, and do not constitute a robust structure by assembly. That is, a structure for temporarily holding the assembled state of each member so that the fixing work can be easily performed on the premise that the fixing work is performed in order to increase the assembly strength after the pipe is bent and joined. It's just that. Fixing work after assembly is generally performed by welding or screw tightening, but in the case of welding, it takes a great deal of labor and time and associated costs under the knowledge of skilled workers. It was a factor that deteriorated economic efficiency. Further, in the case of screw tightening, although skill in work is not required, there is a problem that it is difficult to secure a fastening portion as a square member shape.
JP 2000-345623 A Japanese Patent Laid-Open No. 10-37922

  The problem to be solved by the present invention is an assembly structure obtained by bending and joining hollow square members, saving and simplifying the fixing work of the assembly part, and improving productivity and economy, and assembling An object of the present invention is to provide an assembly fixing structure of a hollow square member capable of forming a strong structure having high strength and rigidity.

In order to solve the above-mentioned problems, the present invention forms a notch in a surface excluding at least one connecting surface among the surfaces constituting the hollow square member, and the first base material and the second base material of the square member divided by the notch portion. In the assembly structure that forms a bent structure that is bent at a predetermined angle by bending the base material at the connecting surface , the first base material includes a bent piece that is bent substantially vertically inside, and the bent piece is bent. The second base material includes a piece facing the bent piece in a state in which the square member is bent, and a fitting hole into which the protrusion fits, and the bent piece and the piece face each other. Bending structure by opening engagement holes at positions facing each other, opening work holes for fastening the engagement holes with a fastening body on the connecting surface, and connecting the bent pieces and pieces with the fastening body It is intended to fix the bent state of the body .

  According to the present invention, an assembly structure that bends and joins the first base material and the second base material, and after positioning the assembly, it is possible to fix both with a fastening body (screw, bolt, etc.) Thus, labor saving and simplification of the assembly work can be achieved, and a robust structure with high assembly strength and rigidity can be formed.

Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is an external view showing a structure assembled by the assembly fixing structure of the present invention.
The structure 1 is assembled by bending and joining hollow square members. Among these, A part and C part are comprised by the bending structure which bent the hollow square material. The configuration of the bent structure will be described below with reference to FIGS.

  The hollow square member 2 has a quadrangular prism shape surrounded by four surfaces 2A to 2D, and a notch 3 is formed at a bending position. The notch 3 is formed by cutting the three surfaces 2B, 2C, and 2D except the surface 2A into a predetermined shape by NC laser processing or the like, and then cutting the cut portion with a jig or the like, and the hollow square member 2 is connected by the surface 2A. The first base 4 and the second base 5 are divided. The bent structure is configured by bending the hollow square member 2 so that the first base member 4 and the second base member 5 abut each other at the notch 3.

  As shown in FIG. 2, the notch 3 is formed with notches 6 and 6 serving as a bending reference for the first base material 4 and the second base material 5 on the surface 2A, and the notches 3 and 6 are formed on the surfaces 2B and 2D. Joining edges 7 · 7 ′, 8 · 8 ′ cut at approximately 45 ° from the recessed groove 6 to the surface 2C are formed, and the fragments supporting the bending of the first base material 4 and the second base material 5 on the surface 2C. 9 and 10 are formed. The cut groove 6 is provided in a corner portion from the surface 2A to the surface 2B and a corner portion from the surface 2A to the surface 2D at the boundary position between the first base material 4 and the second base material 5, and the hollow square member 2 is bent. The reference line L1 is virtually formed. The joining edges 7, 7 ′ and 8, 8 ′ are in contact with each other when the first base material 4 and the second base material 5 are bent, and form the outer shape of the bent structure.

  The fragment 9 is formed at the inner edge of the surface 2C on the first base material 4 side, and a cut groove 11 is formed at a boundary position with the surface 2C, and the bending reference line L2 provided by the cut groove 11 A substantially U-shaped cutout hole 12 is formed at the center position. When this piece 9 is bent at a substantially right angle inward of the first base member 4 along the bending reference line L2, the portion surrounded by the cutout hole 12 becomes a convex piece 13, and the portion excluding this convex piece 13 is the first portion. 2 It becomes the joining piece 14 with the base material 5. The fragment 10 is formed on the surface 2C on the second substrate 5 side, and a long hole 15 into which the convex piece 13 of the fragment 9 is fitted is opened at a boundary position with the surface 2C.

  With such a shape, as shown in FIG. 3, after the piece 9 is bent inward of the first base material 4 along the bending reference line L2, the hollow square member 2 is bent along the bending reference line L1 to the first base material 4. And the second base material 5 are bent so as to face each other, the convex piece 13 of the piece 9 is fitted into the elongated hole 15 of the piece 10 while being positioned, and the joining edges 7 and 8 of the first base material 4 are fitted. And the joining edges 7 ′ and 8 ′ of the second base material 5 come into contact with each other to form a right-angled bent structure. Note that by changing the cutting angle of the joining edge, it is possible to constitute a bent structure other than a right angle, such as part C in FIG.

  When the bending structure is formed in this way, as shown in FIG. 4, the joining piece 14 of the fragment 9 of the first substrate 4 and the fragment 10 of the second substrate 10 abut each other in a face-to-face state. The joint piece 9 and the piece 10 are provided with screw holes 16 and 17 at positions where they are in communication with each other in a contact state. 4 and the bent state of the second base material 5 are maintained. The through hole 19 for attaching the bolt 18 is opened on the axis of the screw holes 16 and 17 on the surface 2A of the second base member 5, and the screwing operation is achieved from the through hole 19. As a result, the bent structure is firmly strengthened in the bent state of the first base material 4 and the second base material 5 by screwing the joining piece 9 and the fragment 10 and constitutes the bent structure without causing a spring back. can do. Although an example in which one screw hole is opened in the fragment is shown here, it goes without saying that a plurality of screw holes may be provided and fixed with a plurality of screws.

Part B in FIG. 1 is constituted by a joined structure in which the tip of the hollow square member 20 is joined to the side surface of the hollow square member 21. The structure of this joint structure will be described with reference to FIGS.
The hollow square member 20 has pieces 22 and 22 formed at the front ends of the faces 20A and 20C facing each other, and a recessed groove 23 that is recessed into the faces 20A and 20C is formed at the base ends of the pieces 22 and 22 and the face 20B. -Engagement projections 24, 24 are formed at the tip of 20D. These pieces 22, 22, the recessed groove 23, and the engaging projections 24, 24 are formed by cutting the tip of the hollow square member 20 into a predetermined shape by NC laser processing or the like and then cutting the cut portion.

  Each of the pieces 22 and 22 forms a cut groove 25 at the boundary position with the surfaces 20A and 20C, and can be folded inward along a bending reference line L3 provided by the cut groove 25. A screw hole 26 is opened in the part. The recessed groove 23 is cut integrally with the cut groove 25 at the base end portions of the pieces 22, 22, and a nut holder 28 having a convex portion 27 formed at the corner portion is attached. The engagement protrusions 24 and 24 are formed to protrude from the front ends of the surfaces 20B and 20D, and both have different sizes to give directionality during mounting.

  The nut holding body 28 has hexagonal holes 29 and 29 into which the nuts are fitted. The nuts 30 and 30 with flanges are fitted into the hexagonal holes 29 and 29, and the hollow square member 20 is formed. It is attached to the recessed groove 23. With the nut holder 28 attached, the flanges 22 and 22 are bent inward so that the flange portions of the flanged nuts 30 and 30 are sandwiched between the piece 22 and the nut holder 28, and the screw of the piece 22 The hole 26 and the screw hole of the nut are matched.

  The hollow square member 21 includes engagement holes 31 and 31 into which the engagement protrusions 23 and 23 of the hollow square member 20 are inserted in a surface 21A to which the hollow square member 20 is joined, and a screw hole 32 that fixes the hollow square member 20 in a joined state. , 32 are opened, and through holes 33, 33 for attaching bolts 34, 34 to the screw holes 32, 32 are opened in the surface 20C facing the surface 20A. The sizes of the engagement holes 30 and 30 are different according to the shape of the engagement protrusions 24 and 24 of the hollow square member 20.

A procedure for forming a bonded structure with the hollow square member 20 and the hollow square member 21 configured as described above will be described.
As shown in FIG. 6, nuts 30 and 30 with flanges are fitted into the nut holder 28 and attached to the recessed grooves 23 of the hollow square member 20, and the pieces 22 and 22 are bent inward. Thereby, the flange part of the nuts 30 and 30 with a flange is clamped by the fragment | piece 22 and the nut holding body 28, and the screw hole 26 of the fragment | piece 22 and the screw hole of the nuts 30 and 30 correspond. Thereafter, when the engaging projections 24, 24 of the hollow square member 20 are inserted into the engagement holes 31, 31 of the hollow square member 21 with the same size, the tip of the hollow square member 20 is temporarily fixed to the surface 20A of the hollow square member 21. In this state, the screw holes 32, 32 of the hollow square member 21 and the screw holes 26, 26 of the hollow square member 20 are matched, so that the bolts 34, 34 are inserted and fixed from the through holes 33, 33. Since the screw holes 26 and 26 of the hollow square member 20 match the screw holes of the nuts 30 and 30, the hollow square member 20 and the hollow square member 21 are firmly joined by connecting the bolts 34 and 34 and the nuts 30 and 30. A bonded structure can be formed.

It is explanatory drawing which shows the flame | frame assembled by the assembly fixing structure of this invention. It is explanatory drawing which shows the assembly fixing structure of a bending structure. It is explanatory drawing which shows the assembly procedure of a bending structure. It is explanatory drawing which shows the assembly state of a bending structure. It is explanatory drawing which shows the assembly fixing structure of a joining structure. It is explanatory drawing which shows the assembly state of a joining structure. It is explanatory drawing which shows the junction part of a junction structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Structure 2 Hollow square material 3 Notch part 4 1st base material 5 2nd base material 9 Fragment 10 Fragment 13 Convex piece 15 Long hole 16 Screw hole 17 Screw hole 18 Bolt (fastening body)
DESCRIPTION OF SYMBOLS 19 Through-hole 20 Hollow square material 21 Hollow square material 22 Piece 24 Engagement protrusion 26 Screw hole 28 Nut holding body 30 Nut with flange 31 Engagement hole 32 Screw hole 33 Through-hole 34 Bolt (fastening body)

Claims (1)

By forming a notch in a surface excluding at least one connecting surface among the surfaces constituting the hollow square material, and bending the first base material and the second base material of the square material divided by the notch portion at the connecting surface In an assembly structure that forms a bent structure bent at a predetermined angle ,
The first base material includes a bent piece that is bent substantially vertically inside, and a protrusion that is formed by bending the bent piece,
The second base material includes a piece facing the bent piece in a state where a square member is bent, and a fitting hole into which the protrusion fits,
The bent piece and the fragment are each opened with an engagement hole at a position where the bent piece and the piece face each other, and an operation hole for fastening the engagement holes with a fastening body is opened on the connection surface. An assembly fixing structure for a hollow square member, wherein the bent state of the bending structure is fixed by joining the piece and the piece with a fastening body .

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