JPH078889Y2 - Retrofit bolt for dovetail - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt used for attaching a panel, a metal fitting, etc. to a dovetail groove formed in a pipe material.

[0002]

2. Description of the Related Art Conventionally, when fixing a fixed object such as a panel or a metal fitting to a dovetail groove formed in a pipe material, a square nut is inserted from the end of the dovetail groove and slid to a predetermined fixed position, and then the object is fixed. The fixed body was inserted into the bolt shaft and fixed. In addition, a method of screwing a stud bolt into a square nut inserted in a dovetail groove to fix it, inserting a fixed body therethrough, and fixing with a hexagon nut has also been commonly performed.

[0003]

[Problems to be Solved by the Invention] This has the following drawbacks. After the pillars are built, the end of the dovetail groove is often closed or located at a high place, so that the square nut cannot be inserted from the end of the dovetail groove. In addition, we cannot respond to requests to attach panels, metal fittings, etc. after the building is completed. The present invention is intended to provide a "recessed bolt for a dovetail groove" that can be used after completion of building, that is, after mounting.

[0004]

In order to achieve the above-mentioned object, the "post-groove dovetail bolt" of the present invention is provided with a head (21) at an arbitrary position of the dovetail groove (1) formed in the longitudinal direction of the pipe material. )
Consists of a bolt (2) to be inserted from above, a spacer (3) to be inserted into the dovetail groove (1) by straddling the bolt head (21), and a hexagon nut (4) paired with the bolt (2). ,(I)
The bolt head (21) has a trapezoidal shape, and the length of the short side surface (23) of the trapezoid is smaller than the width W ₁ of the dovetail groove opening (11).
The spacer (3) has a U-shaped cross section, the distance W ₃ between the side surfaces is equal to the length of the short side surface (23) of the bolt head (21), and the bolt shaft (22) is inserted into the upper surface. (C) The sum of the length of the short side surface (23) of the bolt head (21) and the thickness of both side surfaces of the spacer (3) is greater than the width W ₁ of the dovetail groove opening (11). It is large and is constructed as described above.

[0005]

As shown in FIG. 2, the spacer (3) and the fixed body (5) are inserted into the bolt shaft (22), the hexagon nut (4) is loosely attached, and the bolt (2) is attached to the head (21). ) To a predetermined position of the dovetail groove (1) and tighten the hexagon nut (4) to fix the fixed body (5). (A) Bolt head (2
1) The length of the short side surface (23) and the spacing W ₃ between the side surfaces of the spacer (3) are the width W _{1 of the} dovetail groove opening (11).
Since it is smaller, the bolt head (21) straddling the spacer (3) can be inserted at an arbitrary position in the dovetail groove (1).
(B) As shown in FIG. 3, when the hexagon nut (4) is tightened, the bolt head (21) and the fixed body (5) come close to each other, and the fixed material (5) is crimped to the column (6), The bolt head (21) expands the spacer (3) and presses it against the side wall of the dovetail groove (1). (C) The long side surface (24) of the bolt head (21) prevents the bolt (2) from rotating together when the hexagon nut (4) is rotated. (D) As shown in FIGS. 2 and 3, the length of the short side surface (23) of the bolt head (21) and the spacer (3).
The sum of the thickness of both side surfaces of the dovetail is the width W _{1 of the} dovetail groove opening (11).
Since it is larger, the bolt (2) does not come out of the dovetail groove (1).

[0006]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] In FIG. 1, the bolt head (21) is trapezoidal, and the long side surface (24) has a length of 15 mm and the short side surface (2).
The length of 3) is 11.8 mm, and the size of the bolt (2) is M8.
Is. The spacer (3) has a U-shaped cross section, is made of aluminum for facilitating the expanding action, and has a hole for inserting the bolt shaft (22) in the upper surface. The spacer (3) has a length of 15 mm, and the outer surface distance between both side surfaces is 11.
The thickness of the side surface is 8 mm and the thickness of the side surface is 1.5 mm. The width W ₁ of the dovetail groove opening (11) of the column (6) is 12 mm. The “post-attachment bolt for dovetail” of the present invention has the above-mentioned structure. When using this, (a) as shown in FIG. 2, insert the spacer (3) into the bolt shaft (22). And then straddle the bolt head (21), and further the fixed material (5)
Insert the bolt head (21) through the hexagon nut (4) into the dovetail groove (1) at a predetermined position. The short side surface (23) of the bolt head (21) has a length of 11.8 mm, and the dovetail groove opening (1
Since the width W _{1 of} 1) is 12 mm, the bolt (2) can be inserted at an arbitrary position in the dovetail groove (1). (B) As shown in FIG. 3, when the hexagon nut (4) is tightened, the fixed body (5) is fixed to the column (6). (C) In FIG. 3, the length of the short side surface (23) of the bolt head (21) is 11.8 mm, and the thickness of both side surfaces of the spacer (3) is 3 mm (1.5 ×
2) Since the sum of the two is 14.8 mm and the width of the dovetail groove opening (11) is 12 mm, the bolt head (21) does not come out of the dovetail groove (1). The bolt head (2
1) may be cylindrical or semi-cylindrical. [Example 2]
In FIG. 4, the bolt (2) holds the long side surface (24) of the bolt head (21) sideways so that it can be inserted into the dovetail groove (11) from its upper end. In Example 1, the length of the long side surface (24) of the bolt head (21) was 15 mm, but the lower bottom length was 15 mm and the upper bottom length was 13 mm. The cross section in the longitudinal direction is of a size that fits within the cross section of the dovetail groove (11). (B) When using this, use the bolt head (2
1) Hold the long side surface (24) sideways, insert it into the dovetail groove (1) from its upper end, slide it to a predetermined position, and insert the his fixing body (5) into the bolt shaft (22). , Fix with hexagon nuts (4). Do not use the spacer (3). The length of the long side surface (24) of the bolt head (21) is 1
The width W ₁ of the dovetail groove opening (11) is 3 to ₁₅ mm and is 12 mm.
Therefore, the bolt (2) cannot be pulled out from the dovetail groove (1). (B) In this way, the length of the long side surface (24) of the bolt head (21) is made larger than the width of the dovetail groove opening (12),
When the longitudinal cross section is sized to fit within the cross section of the dovetail groove (1), the bolt head (21) holds the long side surface (24) sideways, and the upper end of the dovetail groove (1) is held in the dovetail groove (1). The fixed body (5) can be fixed by inserting it from. Do not use the spacer (3). When the fixing position is not near the upper end of the dovetail groove (1), no additional attachment is required, and as shown in FIG. 4, the fixed material (5) is lifted and the spacer (3) does not spread. It is very useful because it can be used when retrofitting is not possible as in the case of structure.

[0007]

[Advantage of the Invention] By using the "post-groove dovetail bolt" of the present invention, a fixed material such as a panel or a bracket can be attached to an arbitrary position of the dovetail groove of the column after the building is completed. In addition, it is very useful because it can be used even when it is not necessary to add it, or when it cannot be used. Since the solution of the problem addressed by the present invention has been a long-standing strong demand of the industry, it can be said to be an extremely useful idea.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a sectional view showing a mode of operation of the present invention.

FIG. 3 is a sectional view showing a mode of operation of the present invention.

FIG. 4 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

1 Dovetail 11 Dovetail Opening 2 Bolt 21 Bolt Head 22 Bolt Shaft 23 Short Side of Bolt Head 24 Long Side of Bolt Head 3 Spacer 4 Hexagonal Nut 5 Fixed Object 6 Strut W ₁ Width of Dovetail Opening W ₃ Spacer Spacing between both sides of

Claims (1)

[Scope of utility model registration request] 1. A bolt (2) inserted from a head (21) at an arbitrary position of a dovetail groove (1) formed in a longitudinal direction of a pipe material.
And a spacer (3) that extends over the head (21) of the bolt (2) and is inserted into the dovetail groove (1), and a hexagon nut (4) paired with the bolt (2 ). For the bolt (2),
The opposite top and bottom sides are rectangular, and the sides are two pairs of trapezoids.
A hexahedron head (21) formed with the bottom face as a tip
The pair of short sides of the bottom rectangle are the dovetail groove openings.
Smaller than the width W ₁ of (11) , (b) spacer (3)
Has a U-shaped cross section and a hole for inserting the bolt shaft (22) on the upper surface
Is absent, and the gap W ₃ between the sides is the bolt head.
(21) equal to a pair of short sides of the bottom rectangle,
(C) A pair of short sides of the bottom surface of the bolt head (21) are
And the upper side of the trapezoidal side or short side (23)
The sum of the thickness of both sides of the cursor (3) is the dovetail groove opening (1
It is larger than the width W _{1 of} 1) . "Post-mounting bolt for dovetail groove" configured as described above.