JPH0526164Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a chord member with a bolt extrusion spring used in constructing a three-dimensional truss structure.

[Prior art]

Conventionally, as a chord member with a bolt extrusion spring for constructing a three-dimensional truss structure, as shown in FIG. The locking piece 9 that is cut and raised on the spring support plate 8 is bent to abut on the center of the spring support plate 8 made of a steel plate fixed by welding, and one end of the spring 7 is attached to the spring support plate. 8, and the spring support plate 8 is fitted inside both ends of a steel pipe member 10 having a circular cross section and fixed by welding, and the shaft of the bolt 3 is inserted into the through hole 2 provided at the small diameter end of the end cone 11. At the same time, the large diameter end of the end cone 11 is fixed to the end of the steel pipe member 10 by welding, and the spring 7 is inserted.
A structure has been proposed in which the head 5 of the bolt 3 is engaged with the other end, and the string member 1 is constituted by the steel pipe member 10 and the end cone 11 (for details, see Japanese Patent Application No. 58-83498). (see issue).

However, in the case of this structure of bolt-extruded spring-equipped chords, the number of parts increases because the spring support plate 8 is required, and the spring support plate 8 must be positioned in the longitudinal direction of the steel pipe member by some means. Since it is necessary to weld to the steel pipe member 10, there is a problem that manufacturing is complicated and costs are high.

[Purpose of the invention, structure]

The purpose of this invention is to provide a chord member with bolt extrusion springs for a space truss that can advantageously solve the above-mentioned problems. An end cone 11 having a through hole 2 for bolt insertion is combined to form a chord member 1 for a three-dimensional truss, and a bolt 3 is inserted into the through hole 2 for bolt insertion from the inside of the chord member 1.
In the chord member with a bolt extrusion spring, in which the shaft part 4 of the bolt 3 is inserted and the bolt extrusion spring 6 is engaged with the head 5 of the bolt 3, the center part of the bolt extrusion spring 6 made of wire is connected to the bolt. This is a bolt extruded spring-equipped chord member for a space truss, which is engaged with the head 5 of the three-dimensional truss, and the surrounding wire of the spring 6 is locked with the end cone 11.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

1 to 4 show a first embodiment of this invention, in which large diameter ends of steel pipe end cones 11 are arranged at both ends of a steel pipe member 10, and small diameter ends of the end cones 11. A through hole 2 for bolt insertion is provided at the end cone 11, and a short cylindrical insertion tube 12 is formed at the large diameter end of the end cone 11, and the protrusion length of the insertion tube 12 is approximately 90 degrees. The range of 270° is short and the range of about 270° is long, and a locking groove 13 extending in the circumferential direction is provided on the outer periphery of the long part, and a through hole 2 is provided at the small diameter end of the end cone 11. A female threaded hole opening in the peripheral wall is provided, and a set screw 14 for temporary bolt fixing is screwed into the female threaded hole.

The shaft portion 4 of the bolt 3 is inserted into the through hole 2 from the inside of the end cone 11, and is inserted into the bolt extrusion spring 6 which is a truncated conical or flat spiral spring as shown in FIGS. 3 and 4. The surrounding annular linear portion is fitted into the locking groove 13, and a locking portion 15 for preventing slipping out is bent and continuously provided at the end of the ring portion, and the locking portion 15 and the insertion tube 12 are connected to each other. By engagement with the circumferential end of the protruding portion, said spring 6
This prevents the annular portion from rotating out.

The bolt 3 is pushed in so that it does not protrude from the small diameter end of the end cone 11, and the semi-spherical head 5 of the bolt 3 is engaged with the center of the spring 6, and the head 5 causes the spring to 6 is compressed, the bolt 3 is temporarily fixed to the end cone 11 by the compression spring 14, and the shaft portion 4 of the bolt 3 is
A hexagonal hole 16 for engaging a rotary tool is provided at the tip.

Insertion tubes 12 of an end cone 11 are fitted into both ends of a steel pipe member 10 having a circular cross section, and the end cone 11 is fixed to the steel pipe member 10 by welding. The string material 1 is constituted by the above. When the set screw 14 is loosened, the bolt 3 is pressed by the elasticity of the spring 6, and the shaft portion 4 of the bolt protrudes from the small diameter end of the end cone 11, as shown in FIG.

In the case of the first embodiment, the inner diameter of the surrounding annular portion of the bolt extrusion spring 6 made of a spiral spring is made smaller than the inner diameter of the locking groove 13, and the annular portion is fitted into the locking groove 13 in an enlarged state. If joint pressure is applied, the frictional resistance between the annular portion and the locking groove 13 will prevent the spring 6 from falling off, so the locking portion 15 of the annular portion may be omitted.

5 to 7 show a second embodiment of this invention, in which an insertion cylinder 12 is formed at the large-diameter end of a steel end cone 11, and is extended in the circumferential direction on the inner periphery of the end of the insertion tube 12. A locking groove 13 is provided, and when uncompressed, the surrounding annular linear portion of the bolt extrusion spring 6 made of a truncated conical spiral spring is fitted into the locking groove 13. A part of the side plate in the longitudinal direction is bent so as to cover the annular linear part, and the annular linear part is fixed to the end cone 11 by the bent part 17, but the other structure is the same as that of the first part. This is the same as in the embodiment.

In the case of the second embodiment, the outer diameter of the surrounding annular linear portion of the bolt extrusion spring 6 made of a spiral spring is made larger than the outer diameter of the locking groove 13, and the annular linear portion is reduced. If the spring 6 is fitted and pressed into the locking groove 13 in this state, the frictional resistance between the annular linear portion and the locking groove 13 will prevent the spring 6 from falling off. 17 may be omitted.

8 to 10 show a third embodiment of this invention, in which a tube with a smaller outer diameter than that of the insertion tube 12 formed at the large diameter end of the steel end cone 11 is inserted. A plurality of through holes 19 for inserting fasteners are provided in the support tube 18 at intervals in the circumferential direction of the support tube. The surrounding annular linear portion of the bolt extrusion spring 6 is fitted into the support tube 18, and the groove bottom of the groove-shaped stopper 20 is fitted into the annular linear portion, and the stopper 20 Both arms of the spring 6 are inserted through the through hole 19, and the protruding parts of the arms are bent, and the surrounding annular linear portion of the spring 6 is fixed to the support tube 18 of the end cone 11 by the stopper 20. However, the other configurations are the same as in the first embodiment.

Figures 11 to 13 show other examples of bolt head shapes, and in the case of Figure 11,
The head 5 of the bolt 3 has a flat end surface, and the twelfth
In the case of the figure, the head 5 of the bolt 3 has a hemispherical part, and in the case of FIG.
However, it is provided with a partially cut-out hemispherical part and a spring center annular part fitting protrusion 21 connected to the central part of the hemispherical part.

In the case of FIGS. 1 and 12, the bolt extrusion spring 6 consists of a spring in which the spherical surface of the bolt head 5 has a spiral shape.
Since the bolt is fitted into the central annular portion of the bolt, it is possible to prevent the center of the bolt head from shifting, thereby making it easier to tighten the bolt. In addition, in the case of FIG. 13, the protrusion 21 connected to the center of the head of the bolt 3 is fitted into the center annular portion of the spiral spring 6.
It is possible to reliably prevent the center of the bolt head from shifting.

In each of the above embodiments, the bolt extrusion spring 6 can be easily attached to the chord material by extremely simple means without using a spring support plate or complicated fixing means such as welding. . In addition, if the bolt 3 is temporarily fixed with the push spring 14 so that the shaft 4 of the bolt 3 does not protrude from the end cone 11, the external thread of the bolt shaft 4 can be It is possible to eliminate the risk of deformation due to collision with other objects.

FIGS. 14 and 15 show the state in which the string members with bolt extrusion springs of the first embodiment are joined, in which the end of the string member 1 is a spherical shell having an opening 22 and a female threaded hole 23. The bolt 3 is placed so as to face the outer surface of the joint fitting 24, and the tip of the shaft portion 4 of the bolt 3 is placed to face the female threaded hole 23 of the joint fitting 24, and then the set screw 14 is loosened. , the bolt 3 is pushed out by the elasticity of the spring 6, and the tip of the shaft portion 4 of the bolt 3 is inserted into the female threaded hole 2.
3 (see Figure 14).

Next, as shown in FIG. 15, a rotary tool 26 such as a ratchet trench having a hexagonal engagement shaft portion 25
is inserted into the joint metal fitting 24 from the opening 22 of the joint metal fitting 24, and the engaging shaft portion 25 is fitted into the rotary tool engagement hexagonal hole 16 of the shaft portion 4 of the bolt 3,
Next, the bolt 3 is rotated by the rotary tool 26 to be screwed and tightened into the female threaded hole 23 of the joining fitting 24, and then the rotary tool 26 is removed.

16 to 19 show modified examples of the bolt extrusion spring 6 that can be used in this invention. In the case of the first modified example shown in FIGS. 16 and 17, one spring steel The wire is bent to form a pair of arcuate short sides 6A, a continuous long side 6B, a centrally divided oblique long side 6C, and a line extending from the dividing part of the centrally divided oblique long side 6C toward the continuous long side 6B. An extending central arm 6D is formed, and the arcuate short side 6A
is fitted into the locking groove, and the pair of central arms 6D
The head of the bolt is engaged.

In the case of the second modification shown in FIGS. 18 and 19, one spring steel wire is bent to form a partially notched annular portion 6E and a notched end of the partially notched annular portion 6E. A central arm 6D is formed that extends substantially parallel to the central arm in an inclined state from the central arm 6D.

When implementing this invention, the bolt extrusion spring 6
The material may be metal or plastic, and the cross-sectional shape of the material constituting the bolt extrusion spring 6 may be any shape.

[Effect of idea]

According to this invention, an end cone 11 having a bolt insertion hole 2 is connected to an end of a steel pipe member 10 to constitute a chord member 1 for a three-dimensional truss. In the chord material with a bolt extrusion spring, in which the shaft portion 4 of the bolt 3 is inserted from the inside of the chord material 1, and the bolt extrusion spring 6 is engaged with the head 5 of the bolt 3, the bolt extrusion composed of a wire rod is used. The center part of the spring 6 is the head 5 of the bolt 3.
Since the wire around the spring 6 is engaged with the end cone 11, the bolt extrusion spring 6 can be easily connected to the end cone of the chord 1 without using a spring support plate. 11, the number of parts is small, and there is no need for complicated spring mounting means such as positioning welding of the spring support plate, so it is easy to manufacture chord members with bolt extrusion springs at low cost. You can get the desired effect.

[Brief explanation of drawings]

1 to 4 show a first embodiment of this invention, in which FIG. 1 is a partially cutaway vertical side view of a chord member with a bolt extrusion spring, and FIG.
3 is a side view of the spring for pushing out the bolt, and FIG. 4 is a longitudinal sectional view showing the state in which the tip of the shaft of the bolt is pushed out by the spring. Fig. 5 is a vertical sectional side view showing a part of a chord material with a bolt extrusion spring according to the second embodiment of this invention, Fig. 6 is a sectional view taken along line B-B in Fig. 5, and Fig. 7 is a size of the spring. FIG. 8 is a vertical cross-sectional side view showing a part of the bolt extrusion spring-equipped chord material according to the third embodiment of this invention; FIG. Vertical side view showing an enlarged view of the vicinity of the mounting part, No. 10
The figure is a front view of the spring mounting part. Figures 11 to 13 are longitudinal cross-sectional side views of a string member with a bolt extrusion spring having bolts with different head shapes, and Figure 14 is a longitudinal side view of a string member with a bolt extrusion spring that has bolts with different head shapes, and Fig. 14 shows a bolt extruded with the end of the chord member facing a predetermined position of a joining fitting. FIG. 15 is a vertical side view showing the state in which the string member and the joining metal fitting are fastened and connected. 16 is a front view showing a first modification of the spring for pushing out a bolt that can be used in this invention, FIG. 17 is a side view of the spring, and FIG. 18 is a second modification of the spring for pushing out a bolt that can be used in this invention. Front view showing the 19th
The figure is a side view of the spring. FIG. 20 is a longitudinal sectional side view showing a part of a conventional string member with a bolt extrusion spring. In the figure, 1 is a chord member for a three-dimensional truss, 2 is a through hole for bolt insertion, 3 is a bolt, 4 is a shaft part, 5 is a head part, 6 is a bolt extrusion spring, 10 is a steel pipe member, 1
1 is an end cone, 13 is a locking groove, 14 is a set screw for temporary bolt fixing, 15 is a locking part for preventing removal, 16 is a hexagonal hole for engaging a rotary tool, 17 is a bent part, and 20 is a grooved stop 23 is a female screw hole, and 24 is a joining fitting.

Claims (1)

[Scope of utility model registration request] An end cone 11 having a bolt insertion hole 2 is connected to an end of the steel pipe member 10 to constitute a chord member 1 for a three-dimensional truss.
In the chord member with a bolt extrusion spring, in which the shaft portion 4 of the bolt 3 is inserted from inside the chord member 1, and the bolt extrusion spring 6 is engaged with the head 5 of the bolt 3, the chord member is made of a wire rod. Spring for extruding bolt 6
A bolt extrusion spring-equipped chord member for a three-dimensional truss, characterized in that a central part of the bolt 3 is engaged with a head 5 of the bolt 3, and a wire rod around the spring 6 is engaged with an end cone 11.