JP3867128B1 - Joining device - Google Patents

Abstract

Provided is a trigonal pyramid-shaped unit frame that can be joined to a joining base material at an arbitrary angle and that has one shape of a joining device and an axial member.
A bolt hole at a tip is provided, and a hinged bolt 13 processed so as to be able to be hinged to a shaft member 12 is joined to a joining base material 14, which is fixed to a necessary rotation angle with a fastening nut 15. To do. Disc-shaped or partially spherical joining base materials 14 are joined together by a bolt 18 via a sphere 17. In order to give a width to the position and angle at which the structural units are in contact with each other, a gap 14a between the bonding base material 14 and the bolt hole 14a for joining the bonding base material is made large, and the partial spherical washer 20 is Mounted on the head and nut side. The shaft tip member 25 to which the hinged plate 23 is attached is screwed to the shaft tube 22. After the projection length of the shaft tip member from the shaft tube is determined, the shaft tip member is fixed with a tightening nut 26. The shaft tube is bonded to a non-metallic member 27 such as wood or plastic by bonding or wood screws 32.
[Selection] Figure 1

Description

The present invention relates to a method for constructing a building, assembling machines and instruments, and so on.
The present invention relates to a joining device for joining materials (devices) and structural units .

Conventionally, in order to construct a structure such as a three-dimensional truss, there has been a joining device such as screw joining a shaft member to a sphere. (See Patent Documents 1, 3, and 4)

Japanese Patent Laid-Open No. 2002-371625 proposed a method of joining various shaft structures by connecting shaft members to each other to form a triangular pyramid unit frame, connecting the unit frames obliquely laterally, vertically, etc., and building various buildings. (See Patent Document 6)

There has been a joining device that joins shaft members together by joining base materials, assembles a polygonal plane unit or a polyhedral unit, and joins the units together by joining the joining base materials.
(See Patent Document 2)

In Japanese Patent Laid-Open No. 2002-371625, it has been proposed to make a shaft member of an arbitrary length by expanding and contracting the shaft tube tip member and joining four types of shaft members having different lengths. (See Patent Document 6)

In order to construct a building structure using a log material, there has been a joining device for screwing a joining device having a bolt attached to the tip of the log material to a joining base material such as a mounting sphere. (See Patent Documents 5 and 7)
JP 03-115631 A JP 06-108531 A JP-A-06-200233 JP 07-011705 JP 2001-262713 A JP 2002-371625 A JP 2005-097838 A

When joining a shaft member to a joining base material such as a sphere, conventionally, since the shaft member is directly screw-joined to the joining base material, the direction of the shaft member relative to the joining base material is constant. In addition, it is necessary to thread the joining base material, and since there are more types of joining devices, there is a difficulty in standardization.

FIG. 15 to FIG. 21 are examples of JP-A-2002-371625. FIG. 15 is a perspective view of the artificial ground formed by connecting the triangular pyramid-shaped unit frames 3 obliquely and laterally. FIG. 16 is a plan view of an embodiment in which a house is built on an artificial ground constructed by connecting three triangular pyramid unit frames. FIG. 17 is a three-dimensional view thereof. FIG. 18 is a perspective view of a building constructed by connecting the triangular pyramid unit frames 3 vertically and horizontally and vertically. FIG. 19 shows a dome framework in which a triangular pyramid-shaped unit frame 80 ′ is connected in a circular shape, and a floor assembly 85 ′ and a roof assembly 81 ′ and others are added. FIG. 20 shows a triangular pyramid unit frame 3 in which an inclined member (post) 2 and a truss beam 4 are combined. FIG. 26 shows a building constructed by joining it and the truss beam 4. Since the upper and lower ends of the inclined members 2, 77 ′, 79 ′ are hinge-joined, the height of the horizontal members 1, 76 ′ from the ground can be freely adjusted with the same joining device. See FIG. 22. However, it is necessary to replace the joining device depending on the shape of the triangle formed by the horizontal member 1 or the shape of the unit frame. The large number of types of joining devices poses a difficulty in realizing material stock → assembly → disassembly → stock circulation.

One object of the present invention is to be able to join at any angle to the joining base material in which the shaft member becomes a joint . In addition, a structural unit such as a triangular pyramid unit frame having an arbitrary shape is formed by using one type of joining device and a shaft member.

When a framework is constructed using the joining apparatus of FIG. 22 , a scaffold or a temporary mount is required. In addition, if there is tree planting at the bottom, it will fail to plant trees. It is desirable to assemble the unit frame on the ground suitable for assembling, and to bond them, that is, the bonding substrates.

There was also an attempt to join the joining base materials, but in the production and construction that the screw hole position and direction must be matched simultaneously at the contact point or a slightly separated position between the joining base materials such as spherical shapes. There was difficulty. In addition, when the joining base material is made into a sphere and a plurality of joining base materials are joined and joined together, there are problems in design and maintenance such as painting and cleaning.

Another object of the present invention is to facilitate joining by joining the bonding substrates to each other in terms of positional deviation and angle, and to integrally bond the bonding substrates in terms of design and maintenance. It is in.

The connecting device with bolts, anchor nuts, and sleeves attached to the tip of the shaft member requires precision because there is no device for adjusting the length of the shaft member, and the bolt and anchor nut are stored in the tip shaft tube. However, since it has the complexity of having a sleeve for bolt feeding, it cannot be said that it is suitable for joining small parts such as machine tools.

In Japanese Patent Application Laid-Open No. 2002-371625, a shaft tip member that is provided with a bolt hole at the tip and attached or integrally processed to a tip of a shaft tube with a hinge plate that is processed so as to be able to be hinge-joined with a joint base such as a joint metal A simple device that can be screwed to the tip of a shaft member made of an outer meridian tube and can adjust the length of the shaft member has been proposed. However, since the shaft tip member lacks a device for stopping rotation and fixing the shaft tip member to the shaft tube, vibration and secular change may occur depending on the external force.

Another object of the present invention is to join the tip of the shaft member, which can be adjusted by screwing the shaft tip member to the tip of the shaft member, and fixing it after determining the required protrusion length and rotation angle. The purpose is to build a device and use it widely in buildings, machinery, etc. in accordance with the above purpose.

There has been a technique for constructing a building by attaching members such as bolts, anchor nuts, and sleeves to the end of the log material, and joining the log materials through joint hardware. This joining device requires precision because there is no device for adjusting the length of the shaft member, and has the complexity of housing a bolt and an anchor nut in the metal member at the tip and holding a bolt feed sleeve. For this reason, it is not envisaged to join small non-metallic parts such as lighting fixtures and everyday items.

Another object of the present invention is to create a joining device at the tip of a shaft member that can be adjusted in length by simply adding a device with a simple mechanism to the tip of a non-metallic shaft member such as wood or plastic. Is widely used for buildings, furniture, lighting fixtures, everyday items, etc. in accordance with the above purpose.

The characteristic feature is that, referring to FIG. 1, a bolt hole 11 is provided at the tip, the hinged bolt 13 which is machined so as to be hinged to the shaft member 12 and fitted with a tightening nut is made of a disk. The joint base material and the shaft member formed by screw joining to one side of the steel plate and the partial spherical engraving on the back face are formed, and the structural unit 16 such as a triangular pyramid unit frame is formed, and the joint base materials are connected to each other via a sphere. That is, the device is joined so as to be joined by the bolt 18.

The bonding substrate 14 may be a disk as shown in FIGS. 1 to 4 or a sphere, or may be an aggregate of a plurality of cylindrical bodies as shown in FIGS. good.

Referring to FIGS. 5 and 6, a bolt base 11 is provided at the tip, which is processed so as to be hinged to the shaft member, and a hinged bolt 13 with a tightening nut attached thereto is a joining base material 14 formed of a cylindrical body.
A bolt 13a with a hinge and a fastening nut 15a or a bolt 13 with a hinge 13b, and a fastening nut 15b, which are joined to one side of the cylindrical body portion 14b with screws and joined to the other end of the joining base material. And the joint tightening nut 13c is attached. Bonding the bonding substrate 14 and the shaft member;
A structural unit 16 such as a triangular pyramid unit frame is made, and the joining base materials are joined together by hinged bolts 13a or 13b for joining the joining base materials. This is a joining apparatus characterized by the above.

Referring to FIGS. 7 and 8, the joining base material 14 is composed of a spherical piece having a spherical surface having the same spherical center on the shaft member side and the opposite side. A bolt hole 11 is provided at the tip of the surface of the joining base material 14 opposite to the spherical center, and the hinged bolt 13 that is processed so as to be hinged to the shaft member and is equipped with a tightening nut 15 is screw-joined. The base member 14 and the shaft member 12 are joined together to form a structural unit 16 such as a triangular pyramid unit frame, and the ends of the joining base member 14 are joined together with bolts 18 via the spheres 17.

The hole of the joining base material 14 through which the bolt 18 passes is made a larger hole than the bolt 18, and a partial spherical engraving is put on the tightening nut 19 side and the bolt head side, and the partial spherical shape is the same shape as the partial sphere on both sides of the bolt. The washer 20 is sandwiched.

7 and 8, the fastening nut 15 of the hinged bolt 13 may be circular, and the nut groove 21 for fastening may be provided on the surface of the fastening nut 15 so as to be embedded in the joining base material 14.

9 and 10 , a hinged plate 23 processed so as to be able to be hinge-joined with the hinged bolt of the joining base material is attached to the inner diameter tube 24 of the shaft tube or integrally processed at the tip of the shaft tube 22. The shaft tip member 25 is screw-joined, and the shaft tip member 25 is clamped and fixed with a circular nut 26 having the same diameter as the shaft tube 22 with a required projection length la and a rotation angle d being determined.

Referring to FIG. 11 , the tip of a non-metallic member 27 such as wood or plastic is scraped to match the inner diameter of the shaft tube, and the shaft tube 22 fitted with the shaft tip member 25 and the tightening nut 26 is removed from the non-metallic member. 27. An adhesive 22b is injected and bonded between the shaft tube and the nonmetallic member.

Referring to FIGS. 12 to 14 , the non-metallic member 27 such as wood or plastic is scraped off according to the inner diameter of the shaft tube, and the shaft tube 28 is fully inserted into the non-metallic member 27. The rotation of the screw-in shaft tube is stopped by directing the wood screw 29 from the upper hole of the shaft tube toward the non-metallic member 27 from the upper part of the shaft tube. A disk 31 having a wood screw hole 30 is screwed into the shaft tube 28 up to the edge of the non-metallic member 27. Inserting the wood screw 32 into the wood screw holes 30 to secure the threaded shaft tube 28 wood screws 32 in non-metal member 27. The shaft tip member 25 is screwed to the tip of the shaft tube 28, and the shaft tip member 25 is fixed with a circular nut 26 having the same diameter as that of the shaft tube, with the required protruding length and rotation angle determined.

A bolt with a hinge is screwed to a joining base material, and this can be fixed at an arbitrary rotation angle with a tightening nut. Accordingly, the hinged shaft member from any direction and angle can be joined to the joining base material. Also, the hinged shaft members can be joined from any direction and angle.

By simply changing the number of hinge bolts and shaft members to be attached to the joining base material and joining them together, a shape and a framework that can be formed by a triangular shape such as a triangular shape, a triangular pyramid shape, etc. Can be built or built. Furthermore, if a rigid surface such as a plate material is added to a polygonal surface other than a triangular shape and the shape is maintained, an arbitrary shape and frame can be manufactured or constructed using the joining device and the shaft member. It is possible. It is possible to standardize the joining device according to the purpose of production or construction.

In order to facilitate the joining of structural units such as a triangular pyramid-shaped unit frame, the present invention allows the joining of the joining bases of the structural units to have a wide width between them, or a shaft member and a bolt with a hinge. Are adjusted to match their angle and position.

If the structure unit 3 pyramidal units Frame, as shown in JP 2002-37162 5 (partially shown in FIGS. 15 to 22.), Be connected to the structural unit in a plane or three-dimensional Therefore, it is easy to construct various buildings.

Since these buildings have truss structures, the cross section of the member can be minimized, and the weight of the member and resource saving can be achieved. Since the shaft member is joined by only one pin bolt, the assembly and disassembly of the member is easy, and the reuse of the member is easy.

Unlike conventional ball joints (shaft members are directly screwed to a spherical base material)
Since the structural units can be joined to each other, there is no need for a scaffold or a temporary mount, and it is easy to build a building in places where water and planting zones cannot enter.

Adjusting the length of the shaft member because the shaft tube of the shaft member and the shaft tip member with hinge are screwed together and the protruding length of the shaft tip member is set to the required length and fixed with a circular nut with the same diameter as the shaft tube It is possible to use a single shaft member by allowing manufacturing and construction errors and changing the length of the shaft member.

Since a non-metallic member such as wood or plastic can be used for the shaft member, the building can be constructed using a log material or the like. It can also be used for other structures such as furniture and lighting equipment.

From the above, it can be said that the construction method using the joining apparatus of the present invention is an extremely environmentally friendly construction method.

Compared to conventional ball joints and other joining devices, the details of the joints are simple details with a single pin bolt called a hinge joint, so it is also widely used for joining relatively small parts such as machines, instruments and furniture. Available.

Hereinafter, the present invention will be described based on the illustrated embodiments.
In FIG. 1, a bolt hole 11 is provided at the tip, and a hinged bolt 13 machined so that the shaft member 12 can be hinge-joined is screw-joined to a joining base material 14, and a tightening nut 15 is attached thereto. It is the top view which showed having joined the disk-shaped joining base materials 14 with the volt | bolt 18 via the spherical body 17, and the AA fragmentary sectional view of FIG. The shaft member 12 and the hinged bolt 13 are joined by a pin bolt 11a. The joining base material 14 is formed in a disk shape, and is engraved in a partial sphere so that the interposing sphere 17 side is in contact with the sphere 17. Further, in order to give a width to the angle between the bonding base materials, there is a 17a gap between the bonding base materials 14 (which varies depending on the angle between the bonding base materials 14). Is opened, and the partial spherical washer 20 is attached to the head side and the nut side of the bolt.

FIG. 2 is a front view of FIG. Four hinged bolts 13 and fastening nuts 15 are attached to the disk-shaped joining base material 14, and the joining base materials 14 are joined to each other via the spheres 17 by the two bolts 18. A triangular pyramid-shaped structural unit can be formed using three of the four hinged bolts, and these three structural units can be joined together. The remaining hinged bolt is used for attaching other shaft members.

3 and 4 are a front view showing joining of two joining base materials, respectively, and a sectional view taken along line BB in FIG. Three hinged bolts 13 and fastening nuts 15 are attached to one disk-shaped joining base material 14, and these are joined to each other via a sphere 17 by three bolts 18.

FIGS. 5 and 6 are a plan view and a cross-sectional view taken along the line CC in FIG. The joining base material 14 is a cylindrical body 1 different from the three cylindrical bodies 14b.
It is an aggregate of 4c. Each joining base material 14 forms a triangular pyramid-shaped structural unit 16 by three hinged bolts 13, and the hinged bolt 13a and the fastening nut 15a are attached to the other end of the joining base material. It is joined by the bolt 13b with the hinge, the fastening nut 15b, and the joint fastening nut 13c.

7 and 8 are a plan view, a partial cross-sectional view, and a front view, respectively, showing that three partial spherical joining base materials 14 are joined by a bolt 18 via a sphere 17. Partially spherical bonding substrate 14
May be partially ellipsoidal. Alternatively, the partial spherical bonding base material 14 may be a partial cylindrical bonding base material, and may be bonded by a bolt 18 via a cylindrical body instead of the sphere 17.

9 and 10 are a cross-sectional view and a front view, respectively, taken along line EE in FIG. 10 showing the tip of the shaft member. The shaft tip member 25 to which the hinged plate 23 is attached or integrally processed is screwed to the shaft tube 22. In order to make the total length L (= la + l + lb) of the shaft member 12 the required length, the projection lengths la and lb of the shaft tip member 25 from the shaft tube 22 and the rotation angle d of the shaft tip member are determined and then tightened. The nut 26 is fastened to the shaft tube 22 side to fix the shaft tip member 25. Reference numeral 26a denotes a groove into which a tool tip for tightening the tightening nut 26 is inserted. Two hinged plates 2
3, the hinge of the bolt 13 with the hinge of the joining base material is inserted to match the bolt hole, and the pin bolt 11a is inserted into both holes (see FIG. 1) to join the joining base material and the shaft member. In FIG. 10 , two hinged plates are used, but one plate may be used, or two hinged bolts may be used.
By determining the allowable maximum length of the protruding lengths la and lb of the shaft tip member and screwing together several types of shaft tubes, the shaft member can be arbitrarily lengthened up to the required length Lmax of the shaft member. It is possible to (See Patent Document 6)

FIG. 11 is a cross-sectional view showing an example in which a non-metallic member 27 such as wood or plastic is used as a shaft member. A non-metallic member 27 such as wood or plastic is machined according to the inner diameter of the shaft tube 22, and the shaft tube 22 fitted with the shaft tip member 25 and the tightening nut 26 is fully inserted into the tip of the non-metal member 27. An adhesive 22b is injected between the non-metallic member 27 and bonded. First, non-metallic member 27
An adhesive may be applied to the tip of the shaft, and then the shaft tube 22 may be fully inserted, followed by attachment, and the shaft tip member 25 and the tightening nut 26 may be attached.

FIG. 12 is a cross-sectional view showing another example in which a non-metallic member such as wood or plastic is used as a shaft member. The tip of a non-metallic member 27 such as wood or plastic is machined according to the inner diameter of the shaft tube 28, and a wood screw 29 is inserted from the top of the shaft tube 28 into the non-metallic member 27 from the top of the shaft tube 28.
The shaft tube 28 is stopped from rotating. A disk 31 with a wood screw hole 30 is connected to a shaft tube 28.
The screw is joined to the inside of the non-metallic member 27. A wood screw 32 is inserted into the wood screw hole 30 and a screw shaft tube 28 is fixed to the nonmetallic member 27. The shaft tip member 25 is screwed to the tip of the shaft tube 28, the required protrusion length and rotation angle are determined, and the shaft nut 28 is tightened and fixed to the shaft tube 28 side with a circular nut 26 that is the same as the shaft tube.

13 is a cross-sectional view taken along the line F-F in FIG. 12 , and FIG. 14 is a diagram for easily screwing the wood screw 32.
It is sectional drawing which showed the method of drilling a hole smaller than the cross section of the wood screw 32 beforehand with a drill. A small hole for screwing the wood screw 32 can be made straight with a drill by attaching the temporary disk 31a to the disc 31 and the wood screw hole with a space therebetween. Moreover, since the front-end | tip part of the nonmetallic member 27 is covered with the axial tube 28, even if the wood screw 32 is screwed in, it does not break.

The top view which showed an example of joining of the shaft member which concerns on this invention, a bolt with a hinge, a bolt with a hinge, a joining base material, and a joining base material, AA sectional drawing of FIG. The front view of FIG. The front view which showed another example of joining of joining base materials. BB sectional drawing of FIG. The top view which showed joining of the joining base material which is an aggregate | assembly of a bolt with a hinge and a some cylindrical body, and joining of the joining base materials. The side view of FIG. The top view and partial sectional view which showed an example of joining of a bolt with a hinge, a partial spherical joining base material, and the joining base material. Front view of FIG. EE sectional drawing of FIG. 10 which showed an example of joining of a shaft tube and a shaft tip member. The front view of FIG. Sectional drawing which showed an example of the shaft member joining apparatus with which the non-metallic members, such as wood and a plastic, were joined with the shaft pipe tip part which mounted | worn the shaft tip member. Sectional drawing which showed an example of the shaft member joining apparatus with which the non-metallic members, such as wood and a plastic, were joined with the shaft pipe front-end | tip part which mounted | worn the shaft tip member. FF sectional drawing of FIG. Sectional drawing which showed the drilling method for screwing in a wood screw. The perspective view of the artificial ground Example which consists of the connection of a triangular pyramid unit frame in a prior art, and a floor member. The top view of the Example of the artificial ground and house by the triangular pyramid unit frame connection body in a prior art. The side view of FIG. The perspective view of the building frame Example by the triangular pyramid-shaped unit frame connection body in a prior art. FIG. 5 is an elevational view of another building framework example with a triangular pyramid unit frame articulation in the prior art. The perspective view which showed an example of the triangular pyramid unit frame formed by joining the truss beam and shaft member (it represents with an inclination member in a prior art) in a prior art. FIG. 21 is an elevation view of a building example constructed by the triangular pyramid unit frame and the truss beam of FIG. 20. FIG. 5A is a plan view showing the joining of an upper joining member and a shaft member (represented as a horizontal member or an inclined member in the prior art) in an embodiment of a joining apparatus (represented as a joining member in the prior art) in the prior art. . (B) is CC sectional drawing of (a). (C) is the top view which showed joining of the lower joining member and the shaft member (it represents with an inclination member in a prior art). (D) is a front view of (c).

Explanation of symbols

1, 76 'Horizontal member 2, 75', 77 ', 79' Inclined member 3, 80 'Triangular pyramid unit frame 4 Truss beam 5 Artificial ground 6 Floor member 8, 10 Joint member 9, 11a Pin bolt 11 Bolt hole 12 Axis Member 13, 13 a, 13 b, hinged bolt 13 joint tightening nut 14 joint base material 14 b, 14 c cylindrical body 15, 15 a, 15 b, 15 c, 26, 19 tightening nut 16 structural unit 17 sphere 18 bolt 20 partial spherical washer 21, 26a Nut groove 22, 28 Shaft tube 22a Shaft tube threading 22b Adhesive 23 Plate with hinge 24 Shaft tube inner diameter tube 25 Shaft end member 25a Shaft end member threading 27 Non-metallic member 29, 32 Wood screw 30 Wood screw hole 31 Disc 31a Temporary Attached disk 31b Disk threading 33 Drill

Claims (8)

Tip bolt holes provided, are processed to be shaft member and hinged, the hinged bolt fitted with a nut tightening and screw joint on one side of the bonding substrate made of a disc, formed by the engraved portion spherical back surface A joining apparatus characterized in that a joining base material and a shaft member are joined, a structural unit such as a triangular pyramid unit frame is formed , and the joining base materials are joined to each other with a bolt via a sphere. Tip bolt holes provided, are processed to be the shaft member and the hinged, screw-joined to one side of the bonding base material made of hinged bolt tightening nuts mounted an aggregate of the cylindrical body, said bonding substrate
Bonding base material with hinged bolts and fastening nuts that join the bonding base materials to the other end
And a shaft member are joined, a structural unit such as a triangular pyramid unit frame is made, and the joining base materials are joined together
A joining apparatus for joining the joining base materials with a hinged bolt . The joining base material is composed of a spherical piece having a spherical surface with the same spherical center on the shaft member side and the opposite side, and a bolt hole is provided at the tip on the surface opposite to the spherical center of the joining base material, is processed to be hinged, the hinged bolt fitted with a nut tightening and screw junction, the junction
A joining apparatus characterized in that a base unit and a shaft member are joined, a structural unit such as a triangular pyramid-shaped unit frame is made, and ends of the joined base material are joined with bolts via a sphere. The hole of the joining base material through which the bolt penetrates is made a hole larger than the diameter of the bolt, and a partial spherical engraving is put on the tightening nut side and the bolt head side, and a partial spherical washer having the same shape as the partial ball is sandwiched on both sides of the bolt. The joining apparatus according to claim 1 or 3 , wherein Wherein the tightening nut is circular, it has a groove for the tightening on the surface, the bonding apparatus according to claim 1, 2 or 3, wherein the mounted so as to be embedded in the bonding substrate. At the tip of the shaft tube, a hinged plate processed so as to be able to be hinge-joined with the hinged bolt of the joining base material is attached to the tip of the inner diameter tube of the shaft tube, or a shaft tip member processed integrally is screw-joined, A shaft member formed by fastening the shaft tip member with a circular nut having the same diameter as that of the shaft tube and fixing the shaft tip member to the shaft using the joining device according to claim 1, 2 or 3.
A joining apparatus for joining members together. The tip of a non-metallic member such as wood or plastic is processed to match the inner diameter of the shaft tube, and the shaft tube equipped with the shaft tip member and a tightening nut is fully inserted into the tip of the non-metal member, The joining apparatus according to claim 6, wherein a shaft member is formed by injecting and bonding an adhesive between nonmetallic members. The tip of a non- metallic member such as wood or plastic is machined according to the inner diameter of the shaft tube serving as the end of the non-metal member, and the shaft tube is fully inserted into the tip of the non-metal member and is opened in advance in the shaft tube. Screw the wood screw from the hole toward the non-metallic member from the top of the shaft tube, stop the rotation of the shaft tube, screw the disk with the wood screw hole into the small metal hole in the shaft tube, and screw the wood screw into the wood screw hole of the disk the insert, screwed wood screws to non metallic member, Bol hinged in the joint base member to the shaft tube
A hinged plate machined so that it can be hinged to the shaft is attached to the tip of the inner diameter tube of the shaft tube
Or threaded joint integrally machined shaft tip member, wherein the shaft member comprising the shaft distal member defines a protruding length and rotation angle required to tighten the shaft tube side fixed circular nut having the same diameter as the shaft tube Item 1,
A joining apparatus for joining shaft members together using two or three joining apparatuses.

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