JPS6135311Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a structure for connecting frame beams suitable for fence bodies such as fences, gates, handrails, and cages.

Conventionally, fences such as fences and gates were generally made of
It consists of a number of vertical bars fixed in parallel between the lower frames.

Its structure is to drill a mounting hole in the frame, insert the end of the vertical bar into it, insert a mold consisting of an upper mold and a lower mold from inside the frame, and apply it to the end of the vertical bar. This is a joint structure of frame beams whose ends are expanded in diameter by pressing against the mold.

For example, Japanese Patent Publication No. 54-23904 provides a structure in which the ends of the vertical bars are bent around the holes in the frame and deformed using upper and lower molds, and the vertical bars and the frame are fixed by caulking. do. The reason why it is divided into an upper mold and a lower mold is to allow the upper mold to be inserted into and removed from the frame. The upper mold is provided with a suitable groove, and when the crosspiece is pressed against the groove of the upper mold with a strong force, the end portion expands in diameter to fill the space of the groove.

Japanese Patent Publication No. 54-20465 is similar, using an upper mold and a lower mold to forcefully press the vertical bar into the grooves of the upper mold from above.

In JP-B-52-50756, an upper and lower mold are used, and the vertical bar is pressed from above against the concave strips of the upper mold. The area near the mounting hole of the frame is recessed in advance,
The vicinity of the mounting hole of the frame and the end periphery of the vertical bar are simultaneously deformed to fix the two together.

In Japanese Patent Publication No. 52-34433, a constriction part is formed in advance at the end of the vertical bar, and the upper and lower molds are also inserted into the frame, and the vertical bar is strongly pressed against the upper mold to deform it. The diameter of the end of the vertical bar is expanded to clamp the periphery of the mounting hole of the frame.

As described above, several structures have already been proposed in which the vertical beam is caulked and fixed to the frame without using welding.

The inventor believes that these existing structures have two things in common.

One is to insert a mold consisting of an upper mold and a lower mold into the frame. The upper mold is first inserted, and then the lower mold is inserted, so that the convex part and the grooved part of the upper mold correspond to the lower part of the mounting hole. When the caulking is successful, first remove the lower mold, then separate the upper mold from the caulked part, and then remove the upper mold.

Another common feature is that the shape of the caulking is rotationally symmetrical. Here, rotational symmetry means that the shape is the same in all directions around a certain central axis.

This commonality is actually mutual.

When inserting the lower mold into the frame, the convex part of the upper mold must not touch the area around the mounting hole. If the convex part of the upper mold comes into contact with the back side of the frame, the lower mold will receive a strong frictional force from the upper mold and the inner surface of the frame due to this contact pressure, and will be unable to move further inside the frame. It is.

Also, when the vertical bar and the frame are caulked and fixed, the upper die and the lower die are stationary, and the vertical bar is strongly pushed down toward the upper die. Since this is done, only those with rotational symmetry can be used for the convex portion of the upper mold. This is because if a rotationally asymmetrical convex portion is provided on the upper mold, the asymmetrical portion will come into contact with the vicinity of the mounting hole of the frame first, making it difficult to insert the lower mold.

If the caulked portion is rotationally symmetrical, the vertical bar may rotate with respect to the frame. When the crosspiece rotates,
The bond between the two becomes gradually looser. Moreover, the resistance force against external force in the direction perpendicular to the crosspiece is reduced. The strength of the fence will be lost.

The present inventor devised a frame crosspiece connection structure in which the vertical crosspiece and the frame do not rotate relative to each other by making the caulking portion non-rotationally symmetrical. To form a non-rotationally symmetric caulked part, it is necessary to move the mold within the frame, which is difficult with the conventional method of keeping the mold stationary. Such a joint structure can be realized by using a hydraulic cylinder to expand the diameter of the end of the vertical bar from within the frame in a non-rotationally symmetrical manner.

Hereinafter, the structure, operation, and effects of the present invention will be explained with reference to drawings showing embodiments.

FIG. 1 is a perspective view showing an example of a fence body. The fence body has a plurality of vertical bars 3,... between the upper frame 1 and the lower frame 2.
are arranged orthogonally.

The present invention has a joint part A between the frame and the crosspiece perpendicular to it.
Regarding the structure of

FIG. 2 is an enlarged sectional view showing an example of the vertical bar 3. FIG. The vertical beam is made by bending a painted steel plate into a circular shape, folding back both ends to form bent pieces 4, 4, and connecting the bent pieces 4, 4 with a locking strip 5 having a C-shaped cross section. It is something.

FIG. 3 shows a perspective view of a mechanism for caulking and fixing the vertical beam to the frame.

Through holes 6 are pre-drilled in the sides of the frames 1 and 2. The vertical crosspiece 3 is fixed on a vertical crosspiece lower fixing jig 7 provided with a semicircular groove. The vertical bar fixing jig 8, which is also provided with semicircular grooves, can be moved in the vertical direction by a hydraulic cylinder 9. The vertical bar 3 has a vertical bar fixing jig 7,
8 is clamped and fixed.

The frames 1 and 2 are supported by a frame fixing jig 10. The hydraulic cylinder 11 pushes the frame fixing jig 10 forward. Then, the end of the vertical bar 3 is inserted into the through hole 6 of the frame.

The hydraulic cylinder 12 has frames 1 and 2 and a vertical bar 3.
This is to provide forming force for caulking and fixing. The guide pipe 13, which also serves as the oil supply mechanism, allows
The hydraulic cylinder 12 is inserted into the frame and can be moved to any position.

A caulking tool 14 having a rotationally asymmetrical convex portion is provided on the side surface of the hydraulic cylinder 12 so as to be movable forward and backward by hydraulic pressure. The hydraulic cylinder 12 has a frame opening 15
The caulking tool 14 is stopped at a position overlapping the center of the through hole 6.

FIG. 4 is a perspective view of only the caulking tool 14.

The caulking tool 14 is placed on the cylindrical large diameter portion 16,
A small diameter part 17 with a smaller diameter is provided, and 3 parts on the circumference are provided.
A radial protrusion 18 is formed at the dividing point. The radial projecting piece 18 has a triangular shape connecting the top surface of the small diameter portion 17 and the circumferential surface of the large diameter portion 16. The number of radial protrusions 18 is three in this example, but there are two,
4 pieces, 5 pieces...it doesn't matter.

FIGS. 5 to 7 are cross-sectional views of the frame to show each process of caulking and fixing.

FIG. 5 shows a state in which through holes 6 are bored in the frames 1 and 2. The disk part is not simply cut out from the surface of the frame to form a through hole. A hole smaller than the through hole is bored, and the periphery of the hole is uniformly folded downward to form a flange portion 19. A slightly raised protuberance 20 is formed between the flange portion 19 extending downward and the flat plate portion of the frame.

By performing such burring processing, a cylindrical flange portion 19 is formed, so that stress concentration does not occur in the hole portion and the strength of the frame is not impaired. Moreover, in the present invention, the flange portion 19 is skillfully utilized,
The rotationally asymmetrical connection between the frame and the crosspiece can be made stronger.

FIG. 6 shows a state in which the vertical beam 3 is sandwiched between the vertical beam fixing jigs 7 and 8, the end portion is inserted into the through hole 6, and the hydraulic cylinder 12 is further inserted into the inside of the frame. Vertical 3
The end edge 21 is slightly longer than the lower end of the flange portion 19 and is inserted into the space within the frame.

FIG. 7 shows a state in which the hydraulic cylinder 12 is activated and the caulking tool 14 is extended.

Since the caulking tool 14 is provided with radial projections 18 on three sides around the small diameter portion 17, the end edge 21 and the flange portion 19 are deformed into a shape expanded on three sides.
Since the widened portions 22 are formed on three sides, the vertical bar 3 is caulked and fixed to the frame.

The portion without the radial protrusion 18 is the flange portion 1
9. The edge 21 is hardly deformed.

On the outside of the frame, the vertical bars 3 protrude outward and bulge and deform in the radial direction. Since the bulging deformation portion 23 and the expanding portion 22 strongly press the flange portion 19 of the frame from both sides, the vertical bar 3 does not move in the axial direction with respect to the frame.

FIG. 8 is a perspective view showing the back side of the joint structure of the frame and the vertical bar. FIG. 9 is a perspective view showing the surface of the bonding structure.

In this example, the tip peripheral edge 24 of the vertical bar protrudes inwardly from the tip of the flange, and widened portions 22 are formed on three sides to open outward. That is, both the flange portion 19 and the end edge 21 of the vertical bar are bent outward at three locations.

Although not shown, the circumferential edge 24 may be bent so as to be in contact with the tip of the flange.

In this way, in order to bend not only the edge 21 of the vertical bar but also the flange, there is a conventional method of keeping the upper and lower molds stationary and moving the vertical bar. Useless. As in this example, it is effective to use a hydraulic cylinder or the like to apply a caulking tool to the end edge 21 and the flange portion 19 from inside the frame to expand both.

The present invention has the following effects because the vertical beam is fixed to the frame by forming radially expanded portions on both sides and caulking them.

Since the connecting portion is a radially expanded portion, the vertical bar does not rotate relative to the frame. Therefore, there is no risk that the joint will loosen or loosen, and the joint strength is excellent.

Since there is a flange portion 19 extending inside the mounting hole 6, the contact area with the vertical bar increases, and the vertical bar is strong against external force in the direction perpendicular to the vertical bar. The flange portion 19 is the edge 2
1 to form a widened portion 22, which can prevent rotation and increase resistance to forces in the direction perpendicular to the axis.

This is a useful idea.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a fence body. FIG. 2 is an enlarged sectional view showing an example of a vertical bar. FIG. 3 is a perspective view showing a mechanism for caulking and fixing the vertical beam to the frame. FIG. 4 is a perspective view of the tip of the caulking tool. FIG. 5 is a sectional view of a frame with through holes. FIG. 6 is a sectional view of the frame in a state in which the vertical bar held by the vertical bar fixtures is inserted into the through hole and the hydraulic cylinder is inserted into the frame. FIG. 7 is a cross-sectional view of the frame in a state where the caulking tool of the hydraulic cylinder extends upward and the vertical bar end edge and frame flange are expanded. FIG. 8 is a perspective view showing the back side of the joint structure between the frame and the vertical bar. FIG. 9 is a perspective view showing the surface of the joint structure between the frame and the vertical bar. 1...Top frame, 2...Bottom frame, 3...Vertical frame, 6...
Through hole, 7, 8... Vertical frame fixing jig, 10... Frame fixing jig, 12... Hydraulic cylinder, 14... Caulking tool, 16... Large diameter part, 17... Small diameter part, 18...
Radial projecting piece, 19...flange part, 20... raised part, 21... end edge, 22... expanded part.

Claims (1)

[Scope of utility model registration request] A through hole is formed in the side surface of the frame with a flange portion extending inward on the periphery, and the edge of the crosspiece inserted into the through hole and the flange portion of the frame are pressed outward from the inner surface of the crosspiece. A frame crosspiece characterized in that the frame and the vertical crosspiece are caulked to form a bulging deformed portion on the upper surface of the frame, and the vertical crosspiece is caulked to form a bulging deformed portion on the upper surface of the frame. bond structure.