JP2732981B2 - Joint structure between ball joint and rod of space truss - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, various methods have been implemented for joining a ball joint and a rod in a space truss. One of the methods is disclosed in Japanese Patent Application Laid-Open No. 56-10 / 1981.
No. 4191 has already proposed a screw hole that is provided opposite to an end of a rod and a ball joint that joins the rods, and is screwed into both screw holes. It is generally known that a rod and a ball joint are joined by a connector having male screw portions at both ends.

[0003]

However, in this type of joining method, since the male screw portion of the connector is screwed into the screw holes of both the rod and the ball joint, the screw length between the screw hole and the male screw portion is increased. Since it is necessary to check each of the ball joints on a scale or the like, and the dimensional adjustment between the ball joints needs to be performed while rotating the rod, joining the ball joint and the rod is troublesome.

Further, the connector is connected to both the rod and the ball joint by screwing a male screw portion into a screw hole. Since there is no particular slack between the screw hole and the male screw portion, the connector is not connected to the ball joint. The joining angle was almost determined, and it was extremely difficult to adjust the joining angle of the rod to the ball joint during connection.

[0005] Further, since it is necessary to provide two types of screws, a right-handed screw and a left-handed screw, threading and parts management tend to be complicated. Furthermore, if the rod material has a threaded portion such as a screw hole, screwing of the threaded portion after plating the rod material is extremely troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to surely tighten a connector from the outside of a joint portion and to assemble the connector without confirming the screwing depth of the connector. It is an object of the present invention to provide a joint structure between a ball joint and a rod of a space truss that can be used.

[0007]

According to the joint structure of a ball joint and a rod of a space truss according to the present invention, a threaded hole is provided in the ball joint, and an end of the rod connected to the ball joint is provided with: Attach a joint fitting having a bolt hole at the distal end, insert a wrench hook at the center from the bolt hole to the screw hole side, and insert a connection bolt having a male screw portion at the distal end and the proximal end respectively. A male screw part on the distal end side is screwed into the screw hole, a tightening nut is screwed into the male screw part on the proximal end side, and a set screw protruding into a valley of the male screw part on the proximal end side is provided on the tightening nut. It is configured by screwing.

[0008]

[Embodiment 1] 1 to 3 show an embodiment of a joint structure between a ball joint and a rod of a space truss according to the present invention. In the drawings, reference numeral 1 denotes a ball joint, 2 denotes a rod made of a steel pipe, Is a connector for connecting the ball joint 1 and the rod 2 (hereinafter, referred to as a “connection bolt”), 4 is a joint fitting for the rod 2, and 5 is a loosening of the connection bolt 3 after tightening the connection bolt 3. A tightening nut that prevents rattling.

A threaded hole 6 is formed in the ball joint 1, and a frusto-conical joint fitting 4 is integrally attached to the tip of the rod 2 by welding.

A bolt hole 7 is formed at the distal end of the joint fitting 4 so as to face the screw hole 6, and the connecting bolt 3 is inserted into the bolt hole 7.

At the center of the connecting bolt 3, a spanner hook 8 having a polygonal cross section such as a hexagonal cross section is formed. Male screw portions 9 and 10 are formed at the distal end portion and the proximal end portion of the connection bolt 3, respectively.
Is screwed into.

A tightening nut 5 is screwed into the male screw portion 10 of the connecting bolt 3, and the tightening nut 5 is strongly tightened to the joint fitting 4 side so that the tightened connecting bolt 3 is not loosened. Is fixed to the part.

Further, a screw hole 11 is formed in the tightening nut 5, and its tip reaches the inside of the tightening nut 5. A screw member 12 is screwed into the screw hole 11, and a tip of the screw member 12 penetrates the screw hole 11 and protrudes into a valley of the male screw portion 10 of the connection bolt 3. When the male screw portion 10 of the connecting bolt 3 is strongly pressed by the tip of the screw member 12, the tightening nut 5 is fixed to the connecting bolt 3, thereby firmly preventing the connecting bolt 3 from loosening and rattling. It is fixed to.

When a dimensional error occurs between the ball joint 1 and the rod member 2 during production or construction, the thickness of the washer attached to the male screw portion 9 side of the connecting bolt 3 is adjusted by adjusting the thickness of these washers. Dimensional errors can be easily corrected.

Further, by forming the bolt hole 7 of the joint fitting 4 with an inner diameter slightly larger than the outer 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 of 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 fitting 4, and the tightening nut 5 is screwed into the male thread portion 10 of the connecting bolt 3. A set screw 12 is screwed into a screw hole 11 of the tightening nut 5. Furthermore, this fitting 4
Is integrally welded to the tip of the rod 2. The work up to this point shall be completed at the time of carry-in.

When the rod 2 and the joint fitting 4 are to be subjected to a hot dip galvanizing process, the connecting bolts 3 are to be attached after the plating process. In such a case, an insertion for passing the connecting bolts 3 into the bolt holes 7 is required. The hole 13 is provided in the fitting 4 in advance.

Next, the rod 2 is bridged between the ball joints 1, 1, the joint fitting 4 and the ball joint 1 are opposed to each other, and the male screw portion 9 of the connecting bolt 3 is screwed into the screw hole 6 of the ball joint 1. To match.

Next, a wrench (not shown) is hung on the spanner hook 8 of the connection bolt 3 by holding the tightening nut 5, and the connection bolt 3 is turned by the spanner, so that the connection bolt is inserted into the screw hole 6 of the ball joint 1. 3 is screwed together. In this case, the fastening nut 5 screwed into the connecting bolt 3
It is natural to tighten in a fairly loose state.

Next, when the male screw portion 9 is completely screwed into the screw hole 6 to the end, the tightening nut 5 is strongly tightened to the joint fitting 4 side, and the screw member 12 is further tightened so that the tightening nut 5 is not loosened. Firmly.

[0022]

The joint structure between the ball joint and the rod of the space truss of the space truss according to the present invention has the structure described above, and has the following effects.

[0023] A threaded hole is provided in the ball joint, and a joint fitting having a bolt hole at the tip is attached to an end of a rod material connected to the ball joint. From the bolt hole of the joint fitting to the threaded hole of the ball joint, They are connected by screwing connection bolts. For this reason, the joint angle of the rod to the ball joint can be corrected to some extent by forming the bolt hole with an inner diameter larger than the outer diameter of the shaft portion of the connecting bolt so that the direction of the connecting bolt can be changed freely. In addition, there is an effect that construction errors and manufacturing errors can be absorbed.

Since the connection bolt is formed to have a wrench hook at the center portion and male screw portions at the distal end portion and the base end portion, the connection bolt is turned through a wrench engaging with the wrench hook. There are effects such as that the male screw portion can be easily screwed into the screw hole of the ball joint.

Since a tightening nut is screwed into the male screw portion on the base end side of the connecting bolt, the tightening nut is strongly tightened to the joint fitting side and the tightening nut is fixed to prevent loosening and rattling of the connecting bolt. It can be reliably prevented.

Further, since a set screw projecting from the root of the male screw portion on the base end side is screwed into the tightening nut, the tightening nut is strongly tightened to loosen the tightening nut and eventually the connecting bolt. It is possible to reliably prevent rattling.

When the male screw portion of the connection bolt is tightened into the screw hole, if the set screw is loosely tightened so that the tip thereof slightly projects from the male screw portion, the connection bolt can be guided to the set screw simply by turning. Then, the male screw portion can be screwed into the screw hole without being particularly pressed against the screw hole side.

Further, since the distal end portion of the set screw projects from the root of the male screw portion on the base end side, there is no fear that the male screw portion will be damaged by the set screw, and therefore, the connecting bolt will not turn and cannot be tightened. Absent.

[0029] Even if the rod material to which the joint fitting is attached is plated by so-called doweling, the joint fitting is formed with bolt holes instead of screw holes, so there is no need to worry about clogging of the screw portion due to plating. There is also an effect that plating can be easily performed.

Since the connection bolt for connecting the ball joint and the rod can be tightened outside the joint portion, the tightening of the connection bolt can be surely confirmed by visual confirmation.
It can be carried out.

[Brief description of the drawings]

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

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

FIG. 3 is a cross-sectional view showing a joint structure of a ball joint and a rod before connecting the ball joint and the rod in FIG. 2;

[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 ... Screw hole, 11 ... Screw hole, 12 ... Screw member, 13 ... Insert hole.

Claims (1)

(57) [Claims] In a joint structure between a ball joint and a rod member of a three-dimensional truss constituted by connecting a plurality of rod members three-dimensionally by a ball joint, a screw hole is provided in the ball joint, Attachment fitting having a bolt hole at the distal end to the end of the material, connecting bolt having a spanner hook at the center from the bolt hole to the screw hole, and male threads at the distal end and the proximal end. with inserting the screwed the externally threaded portion of the distal-side into the screw hole screwed a clamping nut onto the male threaded portion of the proximal-side, and the clamping nut
Screw a set screw projecting into the root of the male thread on the base end side.
A joint structure between a ball joint and a rod of a space truss, which is characterized by being formed as follows .