JPH05255978A - Joint structure between ball joint for space truss and pipe member - Google Patents

Abstract

PURPOSE:To surely fasten a coupling bolt on the outside of a joint part, and to eliminate play after the fastening of the coupling bolt. CONSTITUTION:A thread hole 6 is formed in a ball joint 1, and a joint fixture 4 having a bolt hole 7 in its one end part is attached to the front end part of a pipe member 2, and a coupling bolt having, in its center part, a spanner fitting part and in its distal and proximal end parts, male thread parts 9, 10 is screwed into the thread hole 6 of the ball joint 1 through the bolt hole 7 of the joint fixture 4. Further, a fastening nut 5 which can be threadedly engaged with the male thread part 10 on the proximal end part of the coupling bolt 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a ball joint and a rod member of a space truss constructed by three-dimensionally connecting a plurality of rod members by a ball joint.

[0002]

2. Description of the Related Art Various methods have heretofore been carried out as a method for joining a ball joint and a rod in a three-dimensional truss, and one of the methods has been already proposed by the present applicant. As disclosed in Japanese Laid-Open Patent Publication No. 56-104191, this is to provide female threaded portions facing the ends of rods and a ball joint for joining the rods, and male threaded portions at both ends are screwed into the left and right female threaded portions. A method of joining a rod and a ball joint with a connector is known.

[0003]

However, in this type of joining method, since the male screw portions at both ends of the connector are screwed together, it is necessary to check the screwing length one by one on a scale or the like. The dimensional adjustment between them was performed while rotating the rod.

Further, since both the rod and the ball joint are connected by a screw type, the joint angle of the rod to the ball joint is substantially determined, and it is extremely difficult to adjust the joint angle at the time of connection.

Further, since it is necessary to provide two types of screws, that is, a right-handed screw and a left-handed screw, threading and parts management tend to be complicated.

Further, if the rod member has a threaded portion, the screwing of the threaded portion after the plating treatment is extremely troublesome.

The present invention has been proposed in order to solve the above-mentioned conventional problems, and the tightening of the connecting bolt can be reliably performed from the outer side of the joint portion, and the screwing depth of the connector can be achieved. It is an object of the present invention to provide a joint portion structure of a ball joint and a rod member of a space truss that can be assembled without checking each one.

[0008]

In the joint portion structure of the ball joint and the rod of the space truss according to the present invention, a screw hole is provided in the ball joint, and a bolt hole is provided at the end of the rod at the end thereof. Attaching a fitting having the fitting, a screw hole of the fitting from the bolt hole of the fitting, having a spanner hook in the central portion, and screwing connecting bolts each having a male screw portion at the distal end and the proximal end, and A fastening nut that can be screwed into the male screw portion is attached to the male screw portion on the proximal end side of the connecting bolt, and further tightened to the end of the fastener.

[0009]

【Example】

Example 1. FIG. 2 is a sectional view of an embodiment showing the structure of the joint between the ball joint and the rod member of the space truss according to the present invention.
In the figure, reference numeral 1 is a ball joint, 2 is a rod made of a steel pipe, 3 is a connecting bolt for connecting the ball joint 1 and the rod 2, 4 is a joint fitting of the rod 2, and reference numeral 5 is It is a tightening nut that suppresses rattling of the connecting bolt 3 after tightening.

A screw hole 6 is formed in the ball joint 1, and a rod 2
A conical fitting 4 having a truncated cone shape is integrally attached to the tip end of the by welding.

A bolt hole 7 is formed at the tip of the fitting 4, and a connecting bolt 3 is inserted into the bolt hole 7.

A wrench 8 having a polygonal cross section, such as a hexagonal cross section, is formed in the central portion of the connecting bolt 3. Further, male screw portions 9 and 10 are formed on the tip portion and the base end portion of the connecting bolt 3, respectively.
Is screwed into the screw hole 6.

A tightening nut 5 is screwed onto the male thread portion 10 of the connecting bolt 3 on the side of the fitting 4 so that the connecting nut 3 does not loosen after being tightened by the tightening nut 5.
It is firmly fixed to the end of.

A screw hole 11 is formed in the tightening nut 5, and the tip of the screw hole 11 reaches the inside of the tightening nut 5. A screw member 12 is screwed into the screw hole 11. The screw member 12 is tightened deeply, and the male screw portion 10 of the connecting bolt 3 is strongly pressed by the tip portion of the screw member 12 to fix the tightening nut 5, whereby the connecting bolt 3 is firmly fixed so as not to loosen. ing.

When a dimensional error in manufacturing or construction occurs between the ball joint 1 and the rod 2, these are adjusted by adjusting the thickness of the washer attached to the male screw portion 9 side of the connecting bolt 3. The dimensional error can be easily corrected.

Further, since the bolt hole 7 of the joint fitting 4 is formed slightly larger than the diameter of the connecting bolt 3, the joining angle of the rod 2 to the ball joint 1 at the time of connection can be adjusted to some extent.

Next, a method for connecting the ball joint 1 and the rod 2 will be described step by step.

First, the connecting bolt 3 is inserted into the screw hole 6 of the joint fitting 4, and the tightening nut 5 is screwed into the male screw portion 10 of the connecting bolt 3. Further, the set screw 12 is screwed into the screw hole 11 of the tightening nut 5. Then, the joint fitting 4 is integrally welded to the tip of the rod 2. The work up to this point should be completed at the time of delivery.

When the rod 2 and the fitting 4 are hot dip galvanized, the connecting bolt 3 is attached after the plating. In such a case, the connecting bolt 3 is inserted into the bolt hole 7 of the fitting 4. An insertion hole 13 for this purpose is provided in advance.

Next, the rod 2 is installed between the ball joints 1 and 1, the joint fitting 4 is opposed to the ball joint 1, and the male screw portion 9 of the connecting bolt 3 is aligned with the screw hole 6 of the ball joint 1. Let

Next, holding the tightening nut 5, hook a spanner (not shown) on the spanner hook 8 of the connecting bolt 3,
By rotating the connecting bolt 3 with this spanner, the male screw portion 9 of the connecting bolt 3 is screwed into the screw hole 6 of the ball joint 1. In this case, it is natural that the tightening nut 5 screwed into the connecting bolt 3 is tightened in a considerably loosened state.

When the male screw portion 9 can be completely screwed into the screw hole 6, the tightening nut 5 is strongly tightened on the joint fitting 4 side.
Further, the screw member 12 is strongly tightened to firmly fix the tightening nut 5 so as not to loosen it.

[0023]

Since the present invention is constructed as described above, it has the following effects.

Since the connection bolt for connecting the ball joint and the rod can be tightened outside the joint portion, the connection bolt can be securely tightened while visually confirming.

Further, since the bolts, not the screw holes, are formed in the joint fitting of the rod, the joint angle of the rod to the ball joint can be corrected to some extent.

Further, even if the rod and the joint metal fitting are plated by so-called dribbling, there is no concern that the threaded portion will be clogged by plating, and the plating can be performed relatively easily.

Further, by firmly tightening the tightening nut on the joint metal fitting side, it is possible to perform reliable joining, which completely prevents loosening of the connecting bolt after tightening.
The ball joint and the rod can be reliably joined together.

[Brief description of drawings]

FIG. 1 is a partial plan view of a space truss.

FIG. 2 is a sectional view of an embodiment showing the structure of the joint portion between the ball joint and the rod member of the space truss according to the present invention.

FIG. 3 is a cross-sectional view showing the structure of a joint portion before the ball joint and the rod member in FIG. 2 are connected.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ball joint, 2 ... Rod material, 3 ... Connection bolt, 4 ... Joint fitting, 5 ... Tightening nut, 6 ... Screw hole, 7 ... Bolt hole, 8 ...
Spanner hook, 9, 10… Male thread, 11… Screw hole, 12… Screw member, 13… Insertion hole.

Claims (1)

[Claims] 1. A joint portion structure of a ball joint and a rod in a space truss configured by three-dimensionally connecting a plurality of rods by a ball joint, wherein a screw hole is provided in the ball joint, and the rod is provided. At the end of the material, a fitting having a bolt hole at the tip is attached, a screw hole of the ball fitting is made from the bolt hole of the fitting, a wrench is provided at the center, and a tip and a base are respectively provided. A ball joint and rod of a space truss characterized in that a connecting bolt having a male screw portion is screwed, and a tightening nut capable of being screwed into the male screw portion is attached to the male screw portion on the proximal end side of the connecting bolt. Joint structure with material.