JP2526484Y2 - Connection structure of square tube - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a connection structure of a rectangular pipe such as an arm hardware for overhead wire hardware or a beam for construction.

(Prior Art) Among the conventional wire clamps for overhead wire hardware, in particular, a D-shaped clamp (a)
As shown in FIG. 7, a square steel pipe (b) was inserted into the inside of the connection pipe (c) from both ends of the connection pipe (c) bent at 90 degrees and fixed and connected by welding.

(Problem to be solved by the invention) When such a connection is made, the connection pipe (c) has a diameter larger than that of the square steel pipe (b), and thus has sufficient strength. However, as shown in FIG. 7, a wire fitting (d) for supporting an insulator or the like is often attached to the outside of the arm (a). In this case, the wire fitting (d) has a channel groove type main body. A method of covering the outer frame of the D-shaped arm (a) with a bolt or the like is used, but the end of the connection pipe (c) protrudes from the outer periphery of the square steel pipe (b) as shown in the drawing, When attaching the overhead wire hardware (d), it will rattle. In addition, since the connecting pipe (c) has such a large diameter, it also hinders attachment of other hardware or the like to these locations.

Therefore, this connecting pipe (c) is reduced in diameter and the square steel pipe (b)
Although it is conceivable to fit the inside of the end of the connection pipe, if the diameter of the connection pipe (c) becomes small, the strength falls and it is not suitable for use.

This invention has been made in view of these points,
An object of the present invention is to solve the above problem by providing a connection structure having a small diameter and a high strength in a connection structure of two rectangular tubes.

(Means for Solving the Problems) In the present invention, the hollow portion of the curved connector is provided at the center of the curved connector which is formed by convexly bending the outer peripheral center portion with the opening surface of the cross-sectional channel thin material inward. A reinforcing plate is inserted from the opening surface of the cross-sectional channel groove so as to cut off symmetrically, and abutting edges of both sides of the cross-sectional channel groove are fixed by welding. One end of the reinforcing plate is a curved connector. The two ends of the two rectangular tubes to be connected are fitted into the respective ends of the two square tubes to be connected, and the ends of the respective square tubes are brought into contact with the protrusions of the reinforcing plate to be fixed. That's what I did.

(Operation) Since the central portion of the connecting body has a reinforcing plate protruding from the outer periphery of the connecting body, when both sides of the reinforcing plate are inserted into the ends of the two rectangular tubes to be connected, the edges of these rectangular tubes are inserted. Corresponds to the protruding portion of the connection body, and serves as a stopper, so that the senner can be taken out. The cross-sectional shape of the connecting body is substantially the same as the inner circumferential cross-sectional shape of each square tube, and both sides of the connecting body are fitted to the inner circumference of each square tube.

The notch of the reinforcing plate in the connection body eliminates distortion due to welding when the reinforcing plate is fixed in the connection body.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the D-shaped arm 1 is formed by connecting a horizontal arm 2 and a vertical arm 3 made of one square steel pipe by a curved connecting body 4. Each of the horizontal arms 2 is connected to two rectangular short steel pipes 5 and 6 by a linear connector 7.

The curved connector 4 is provided with a main body 8 which is formed by bending a channel material having a cross-section at a substantially right angle to be curved, and a reinforcing plate 10 is provided so as to block a hollow portion 9 of the main body 8 at a central portion. The reinforcing plate 10 is provided with cutouts 11 and 11 on both sides of an abutting edge of the main body 8 on the inner periphery of the bottom plate, and is fixed by welding the abutting edges on the inner peripheral surfaces on both sides of the main body 8. These notches 11, 11 are provided to eliminate the distortion due to this welding.

The reinforcing plate 10 is provided with an outflow hole 12 for preventing pooling of hot-dip galvanizing or the like. On both sides of the main body 8 are inserted portions 8a, 8a made of a linear channel groove material.
Is formed. The outer end of the reinforcing plate 10 is inserted into each of the insertion portions 8a.
The protruding edge 10a slightly protrudes from the outer periphery of the key-shaped concave portion 13 formed at the intersection of the inside.

Then, as shown in FIG. 2, each insertion portion of this curved connector 4
8a were inserted into the ends of the horizontal arm 2 and the vertical arm 3, respectively, and the edges 2a and 3a were welded to the outer surface of the curved connector 4 and drilled in the edge 2a of the horizontal arm 4. The inside of the through hole 14 is also welded.

The above embodiment is for a D-shaped arm,
The present invention is not limited to this, and it can be used for connection of other rectangular pipes such as arm wires for overhead wire fittings and beams for construction.

(Effects of the Invention) This invention has the above-described structure. The diameter of the connecting body to be connected by bending the two rectangular tubes is reduced, and the connecting body is fitted to the inner periphery of the end of the rectangular tube to be connected. The connecting portion does not have a large diameter, and the connecting member does not hinder the attachment of another member to the corresponding portion. Usually, it is very difficult to bend a rectangular tube, but in this respect, the connecting body of the present invention can be easily bent because of the cross-sectional channel shape and is lightweight. Moreover, as described above, even if the connecting body is formed in a channel groove shape in cross section and the diameter is smaller than the square pipe to be connected, the reinforcing plate for blocking the hollow portion of the connecting body to the left and right is provided, so that the strength is high and suitable for use. Things. Further, since one end of the reinforcing plate protrudes from the outer periphery of the connecting body, it serves as a stopper when a rectangular tube is inserted on both sides of the connecting body, so that centering can be easily performed and the connecting operation can be simplified.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a front view of an embodiment in which the present invention is applied to a D-shaped arm, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. FIG. 4 is an enlarged view of a portion B in the figure, FIG. 4 is a side view of the curved connector of the present invention, FIG. 5 is a front view thereof, FIG. 6 is a sectional view taken along line XX of FIG. 5, and FIG. It is a front view which shows the connection structure of the conventional square pipe in a metal arm, and the attachment position of the wire hardware. In the figure, 2 is a horizontal arm, 3 is a vertical arm, 4 is a connector, 8 is a main body, 9 is a hollow portion, 10 is a reinforcing plate, and 10a is a protruding edge.

Claims (1)

(57) [Scope of request for utility model registration] 1. A hollow portion of a curved connector is symmetrically cut off at a central portion of a curved connector which is formed by convexly bending an outer peripheral center portion with an opening surface of a cross-sectional thin material inward. A reinforcing plate is inserted from the opening surface of the cross-sectional channel groove, and the contact edges with the inner peripheral surfaces on both sides of the cross-sectional channel groove are welded and fixed, and one end of the reinforcing plate is projected from the opening surface of the curved connector, Both ends of the curved connection body are fitted into respective ends of two rectangular tubes to be connected, and the ends of the respective rectangular tubes are brought into contact with the protrusions of the reinforcing plate and fixed. Square tube connection structure.