JPH0222405Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a fastening fitting for structural pipes used in relatively large structures such as temporary pools and exhibition halls.

[Conventional technology]

BACKGROUND OF THE INVENTION Conventionally, as described above, a fastening fitting for structural pipes as shown in FIG. 6 has been known. In this fastening fitting, a holding cylinder 2 is fitted and fixed to the end of a pipe to be fastened 1, a bolt 3 whose head 3a abuts the end surface of the holding cylinder 2 is loosely inserted into the holding cylinder 2, and the bolt 3 is attached to the pipe. A rotation operating member 4 is loosely fitted into the portion protruding from the bolt 3, and an engaging pin 5 is inserted into an axially long elongated hole 4a provided in the operating member 4 and protrudes from the outer periphery of the bolt 3.
were slidably engaged. In order to fasten the pipe 1 to the mounting member 6 fixed in advance using this fastening fitting, by rotating the operating member 4, the male threaded portion of the bolt 3 protruding from the tip of the operating member 4 is attached to the mounting member. The head 3a of the tightening bolt 3 is pressed into contact with the end surface of the holding cylinder 2 through the female threaded hole 6a of No. ing.

[Problem that the invention attempts to solve]

With the conventional structural pipe fastening fittings mentioned above, it is necessary to attach a holding tube, a bolt, and a rotating operation member to the end of the pipe to be fastened in advance at a factory, etc., so the pipe must be cut at the site of use. It is not possible to process the pipe by making it shorter, and there is a risk that the bolt or the operating member may collide with other objects during transportation, causing damage such as bending the engagement pin.Furthermore, the holding cylinder is firmly fixed inside the pipe. This requires drilling multiple holes in the pipe and welding the holding cylinder to the pipe at these holes, which is cumbersome and requires finishing to prevent damage to the appearance, which is expensive. Furthermore, there was a problem in that the elongated hole of the operating member and the pin provided on the bolt were visible from the outside when in use, so the appearance was not very good.

This invention solves the problems of the conventional ones mentioned above, and is easy to handle, as the pipe to be fastened can be cut to any length and easily assembled to the pipe at the site of use, and the component parts can be easily assembled. It is an object of the present invention to provide a fastening fitting for a structural pipe that can be mass-produced, can be attached to a pipe with great strength relative to a mounting member, and has a good appearance when in use.

[Means for solving problems]

The structural pipe fastening fitting according to this invention has a shaft portion formed on the tip side of the tapered end portion,
A non-circular section with a larger cross-sectional area than the shaft is formed on the tip side of this shaft section through a step, and a shaft bolt is formed with a threaded section on the tip side of this non-circular section section, and the taper of this shaft bolt. Positioned with a gap on the outer periphery of the non-circular cross-section of the shaft bolt through the stepped portion that abuts the step of the shaft bolt on the tip side of the hole having a tapered portion and a straight portion corresponding to the end portion and the shaft portion. has an engaging hole portion and an inner surface formed with the engaging hole portion,
A fastening member having an outer surface forming a fastening portion to be fitted into a pipe to be fastened, and further divided into a plurality of parts in the circumferential direction;
The bolt has a non-circular cross-section hole that engages with the non-circular cross-section of the shaft bolt so as to be movable in the axial direction, and is engaged with the engagement hole of the fastening member so as to be rotatable around the axis while restraining the axial movement. The tapered end of the shaft bolt is fitted into the pipe, and a portion of the rotation operation member or this part and a fastening portion of the fastening member are connected to the tip side of the fastening portion. A protruding support part is disposed between the pipe and the mounting member, and the external thread of the shaft bolt protruding from the operating member is tightened by rotation of the rotation operating member onto the internal thread provided on the mounting member, and the fastening part is tightened. is crimped onto the inner peripheral surface of the pipe.

[Effect]

The fastener according to this invention combines the shaft bolt, the fastening member, and the rotating operation member at the site of use, and inserts at least a part of the shaft bolt and the fastening member into the pipe to be fastened from the end of the pipe. Since there are no parts to be assembled to the pipe to be fastened at a factory, etc., the pipe can be easily cut to the required length and assembled to the pipe at the site of use, making it easy to handle. All rotating operating members can be easily mass-produced, and since no welding or screwing is required when assembling these pipes, they are easy to process and can be provided at low cost. The bolts rotate together and are pulled toward the mounting member, and as a result, the fastening member expands to the outer circumference due to the tapered end of the shaft bolt and the tapered part of the fastening member fitting together, and the fastening member is tightened. The fastening part of the member is crimped to the inner circumferential surface of the pipe and the diameter of the pipe is expanded slightly, so the fastening member can be fixed to the pipe with a large crimping force. It can be firmly fixed via the bolt and the rotating operation member, and furthermore, since there are no long holes visible from the outside or pins that engage with the long holes in the fastening member and the operation member, the appearance is good and the operation is easy. By rotating the members in the opposite direction, the diameter expansion effect of the fastening member by the shaft bolt is eliminated, and the pressing force of the fastening portion against the inner circumferential surface of the pipe is eliminated, so the fastening member and shaft bolt can be pulled out from the pipe as one unit. In addition, there are no pins or long holes that are visible from the outside during use, and there are no welded parts of the holding cylinder at the end of the pipe, so it looks good.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, 7 is a shaft bolt, 8 is a fastening member, and 9 is a rotating operation member, which constitute a fastening fitting 10. As shown in FIG. 2, the shaft bolt 7 has a hexagonal cross-sectional portion and a distal end portion 7b that is continuous with a tapered portion 7a.
A linear shaft portion 7c is formed on the tip side of the shaft portion 7.
A hexagonal non-circular cross section 7e with a large cross-sectional area is formed on the tip side of c through a step 7b, and a threaded portion 7f is formed on the tip side of the non-circular cross section 7e.
As shown in FIG. 3, the fastening member 8 is divided into two parts symmetrically in the circumferential direction, and a hole in which a tapered part 8b and a straight part 8c are formed is formed in the inner circumferential surface of these divided pieces 8a. There is a step 8 on the tip side of the hole.
An engagement hole 8e with a large inner diameter is formed through the hole d, an engagement groove 8f is formed in the engagement hole 8e, and a fastening portion to be fitted into the pipe 11 is formed on the outer peripheral surface of the divided piece 8a. A large-diameter support portion 8i is formed on the distal end side of the fastening portion 8g via a step 8h, and several tapered grooves 8j are formed on the distal end side of the step 8k such that several tapered grooves 8j have a small diameter.
are arranged in parallel in the axial direction. As shown in FIG. 4, the rotation operation member 9 is formed with a hexagonal non-circular cross-sectional hole 9a passing through it in the axial direction, a small diameter hole 9a formed at the end of the outer periphery, and a circular convex shape at the most end. Part 9b
The operating portion 9 has a flat surface 9d facing toward the distal end side of the engaging portion 9c.
e is formed.

In order to use the fastener 10 made up of the above-mentioned members, a tapered part 8b and a straight part 8c of corresponding shapes are arranged on the outer circumferential side of the tapered end part 7b and shaft part 7c of the shaft bolt 7. The hole of the fastening member 8 is fitted into the hole, and the step 8d of the fastening member 8 is arranged so as to abut the step 7d of the shaft bolt 7 from the distal side, and the non-circular cross section 7 of the shaft bolt 7 is inserted.
e into the non-circular cross-sectional hole 9a of the rotation operation member 9,
The operating member 9 and the shaft bolt 7 are made to be movable in the axial direction and engaged with each other while preventing rotation around the shaft, and the engaging portion 9c of the operating member 9 is fastened to the non-circular cross-section portion 7e of the shaft bolt 7. It is fitted into the gap between the engagement hole 8e of the member 8 to enable rotation of the operating member 9 and the fastening member 8 around the axis, and the annular protrusion 9b of the operating member 9 is slightly inserted into the engagement groove 8f of the fastening member 8. The axial movement of the operating member 9 and the fastening member 8 is restrained with a margin of . As described above, the fastening fitting 10 assembled at the site of use is inserted into the pipe 11 to be fastened from the end, the step 8h on the outer periphery of the fastening member 8 is supported on the end surface of the pipe 11, and the shaft bolt 7 is inserted into the pipe 11. End part 7b
and fitting of the fastening portion 8g between the shaft portion 7c and the fastening member 8,
Support part 8i of fastening member 8 and operating part 9 of operating member 9
e is placed between the pipe 11 and one surface 12a of the fitting 12, which is a hollow regular octahedron and is a mounting member. In this state, the male threaded portion 7f of the shaft bolt 7 protruding from the front end surface of the operating member 9 is tightened into the female thread 12b of the hole provided in the surface 12a of the joint fitting 12. That is, when the operating portion 9e of the operating member 9 is grasped and rotated by hand or with a tool, the non-circular cross-sectional hole 9a of the operating member 9 and the non-circular cross-sectional portion 7 of the shaft bolt 7 are removed.
By the engagement e, the shaft bolt 7 rotates integrally and is pulled toward the joint fitting 9 side. When the shaft bolt 7 is pulled, the tapered portion 7a of the end portion 7b of the shaft bolt 7 is pushed into the tapered portion 8c of the fastening member 8.
The divided pieces 8a of the fastening member 8 are pushed outward with a gap formed between these divided surfaces, and the fastened portion 8g is attached to the pipe 1.
The end portion of this is slightly enlarged in diameter and crimped onto the inner circumferential surface of No. 1. At the same time, the fastening member 8 is tightened by the shaft bolt 7.
Then, the operating member 9 is pushed toward the joint metal fitting 12 side, and together with these, the pipe 11 also moves toward the joint metal fitting 12 side, and the distal end surface of the operating member 9 is pressed against the surface 12a of the pipe 11. In this embodiment, the fastening portion 8g of the fastening member 8
Since a plurality of tapered grooves 8j are formed in the , the fastening part 8g can easily expand the diameter of the pipe 11, and even when a tensile force is applied to the pipe 11 in the direction opposite to the side where the fitting 12 is located. The pipe 11 is difficult to come off from the fastening portion 8g. The joint fitting 12 has holes each having a female thread 12b formed on each surface 12a of an octadecahedron, and a plurality of holes can be formed by fastening a pipe to an appropriate surface in the same manner as in the above-mentioned embodiment. The pipes can be connected via the fittings 12. Further, by rotating the operating member 9 in the reverse direction, the shaft bolt 7 is pulled out from the joint fitting 12, the pipe 11 can be removed, and each member of the fastening fitting 10 can be removed from the pipe 11.

FIG. 5 shows another embodiment of this invention. In this embodiment, the entire fastening member 9 is connected to the pipe to be fastened 11.
The parting line of the fastening member 9 is not visible from the outside by fitting into the fastening member 9, thereby improving the appearance. Note that the configuration of this embodiment other than those described above is the same as that shown in FIGS. 1 to 4, and
The same reference numerals in the figure as in FIG. 1 indicate corresponding parts.

In this invention, the fastening member is divided into two in the circumferential direction in the above embodiment, but the number of divisions can be increased, such as three or four. In addition, although the embodiment described a pipe with a circular cross section, this invention can also be applied to a pipe with a cross section such as a square. In this case, the fastening member also has a corresponding square cross section and is divided into multiple parts along the diagonal. It is preferable to do so. Furthermore, in this invention, the non-circular cross-section of the shaft bolt and the non-circular cross-section hole of the operating member are not necessarily limited to hexagonal shapes, but may be appropriately shaped as long as the shaft bolt and the operating member do not rotate around the axis. Can be changed. In this invention, the mounting member for fastening the pipe to be fastened is not limited to the joint fittings of the embodiment, but can be changed as appropriate as long as it has a female thread to which the male thread of the shaft bolt can be tightened. .

[Effect of idea]

As explained above, the present invention consists of a shaft bolt, a fastening member divided into a plurality of parts in the circumferential direction, and a rotation operation part, and these can be easily assembled to a fastened pipe by combining them at the site of use. Since there are no parts to be assembled to the pipe in advance at a factory, etc., the pipe can be cut to the required length and assembled at the site of use, making it easy to handle. is easy to process and can be provided at low cost.By rotating the operating member, the fastening member expands to the outer circumferential side and is crimped to the inner circumferential surface of the pipe, so it can be firmly fixed to the pipe. Some parts of the parts are visible from the outside when in use, but these parts do not have long holes or pins.
The effect of not subjecting the pipe to any processing that would impair its appearance and providing a good appearance can be obtained.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view showing an embodiment of this invention in use; Figures 2A and B are side views and end views of the shaft bolt; Figures 3A, B, and C are fastened. A side view, a partial side sectional view, and a front end view of the member; FIGS.
FIG. 5 is a vertical cross-sectional view of the main part showing another embodiment of this invention, and FIG. 6 is a vertical cross-sectional side view of a conventional example in a state of use. 7... Axial bolt, 7a... Taper, 7b... End part, 7c... Shaft part, 7d... Step, 7e... Non-circular cross-section part, 7f... Male thread part, 8... Fastening member,
8a...Divided piece, 8b...Tapered part, 8c...Straight part, 8d...Stepped part, 8e...Engagement hole part,
8g... Fastening portion, 8i... Support portion, 8j... Taper groove, 8k... Step, 9... Rotating operation member, 9a...
...Non-circular cross-section hole, 9c...Engaging part, 9e...Operation part, 10...Fastening metal fitting, 11...Pipe to be fastened,
12...Joint fittings (mounting fittings), 12b...Female thread.

Claims (1)

[Claims for Utility Model Registration] (1) A shaft portion is formed on the tip side of the tapered end portion, and a non-circular cross-sectional portion having a larger cross-sectional area than the shaft portion is formed on the tip side of the shaft portion via a step. A shaft bolt is formed, and a threaded portion is formed on the distal end side of this non-circular cross section, and a shaft is formed on the distal end side of a hole having a tapered end portion and a straight portion corresponding to the tapered end portion and the shaft portion of the shaft bolt. It has an inner surface with an engagement hole located on the outer circumferential side of the non-circular cross section of the shaft bolt with a gap through the step that contacts the step of the bolt, and forms a fastening portion that fits into the pipe to be fastened. A fastening member having an outer surface and further divided into a plurality of parts in the circumferential direction, and a non-circular cross-section hole that engages with the non-circular cross-section portion of the shaft bolt so as to be movable in the axial direction, and an engagement hole portion of the fastening member. a rotation operating member having an engaging portion on its outer periphery that is rotatable around the axis and engages with restraint of axial movement; A part of the rotation operation member or a supporting part protruding toward the front end of the fastening part of the fastening member is arranged between the pipe and the mounting member, and the internal thread provided on the mounting member is Fastening of a structural pipe characterized in that the male threaded portion of the shaft bolt protruding from the operating member is tightened by rotation of the rotating operating member, and the fastening portion of the fastening member is crimped onto the inner peripheral surface of the pipe. Metal fittings. (2) The fastening fitting for a structural pipe according to claim 1 of the utility model registration claim, in which the fastening part of the fastening member has a plurality of tapered grooves arranged in parallel in the axial direction via steps, the end side having a smaller diameter. .