JP2000199509A - Fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strongly fasten folded plates, also surely prevent them from loosening and improve the appearance and safety. SOLUTION: The shaft section 11a of a blind bolt 11 is inserted into a pair of folded plates 20 with a leg opening collar 13 and a resin insert 14 fitted in this order, and a fastening nut 12 is fastened with a water proof packing 15 and throttle washer 16 are fitted in this order. At the opposite side tip section of a head section 11b, the shaft section 11a of the blind bolt 11 is provided with a square pole-shaped chucking section 11c provided with screw groove sections 11d, and a pair of screw grooves 11e and 11g are provided continuously with the screw grooves 11d through a groove section 11f for cutting in the same direction as the screw grooves 11d, in addition, a reverse thread groove 11h is provided in the opposite direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fastening siding plates constituting an outer wall of a building in a state where the siding plates are overlapped with each other, or connecting ends of corrugated plates constituting a roof to each other. The present invention relates to a fastener used for fastening in an overlapped state.

[0002]

2. Description of the Related Art In order to fasten ends of a pair of corrugated plates constituting a roof in a state of being overlapped with each other, for example, a blind bolt, a fastening nut, and a shaft of a blind bolt are used. A fastener having an open leg collar fitted to the part and a resin insert is used. In such a fastener, an opening leg collar and a resin insert are sequentially fitted to a shaft portion close to a head of a blind bolt. In the open leg collar, a plurality of slits opened to the distal end side are provided in the distal end portion located on the far side of the head in a state along the axial direction.

[0003] In such a fastener, a blind bolt is inserted through ends of a pair of folded plates which are overlapped with each other in a state in which an opening leg collar and a resin insert are fitted in order to the blind bolt. Then, the fastening nut is screwed to the blind bolt. Then, the blind nut is tightened by rotating the blind bolt in a state where the tightening nut is not rotated, and the tightening nut is pressed against the surface of one folded plate. When the blind bolt is further rotated in such a state, the head of the blind bolt is slid so as to approach the folded plate. As a result, the open leg collar and the resin insert are compressed between the head of the blind bolt and the surface of the folded plate, and the open leg collar is pressed against the resin insert. From the side, they are sequentially expanded and pressed against the surface of the folded plate with the insert inserted therein. In such a state, when the blind bolt is further rotated, the resin insert is strongly pressed against the surface of the folded plate in a state of being inserted into the opening leg collar, and becomes in a crushed state. Thereby, the ends of the pair of folded plates that are overlapped with each other are strongly fastened.

[0004]

In the fastener having such a structure, the resin insert is strongly pressed against the surface of the folded plate in a crushed state by tightening the tightening nut. And if you tighten the tightening nut more strongly, the resin insert will
It is strongly pressed against the surface of the folded plate. in this way,
If the torque required for the tightening is increased, the tightening nut can be further tightened. Therefore, there is a problem that the tightening nut cannot be stably fixed in a state where the tightening nut is prevented from loosening. .

[0005] By rotating the blind bolt with respect to the tightening nut, the amount of protrusion of the shaft portion of the blind bolt from the tightening nut increases. In the state where the shaft portion of the blind bolt protrudes largely from the tightening nut, the appearance is poor, and if the blind bolt is used in a place where a person can pass, the shaft end of the protruding blind bolt may be May be damaged.

An object of the present invention is to solve such a problem, and an object of the present invention is to enable at least a pair of fastened members to be firmly fastened in a state where they are securely prevented from loosening. Another object of the present invention is to provide a fastener which is excellent in safety and can be used safely even in a place where people pass.

[0007]

SUMMARY OF THE INVENTION A fastener according to the present invention has a head at one end of a shaft penetrating at least a pair of members to be fastened to each other, and the other end of the shaft. A chucking portion having a polygonal section in cross section is provided at an end of the shaft portion.Further, a pair of screw groove portions each extending in the same direction are formed on the shaft portion through the cutting groove portion, following the chucking portion. And a blind bolt provided with a reverse screw groove portion extending in a direction opposite to the pair of screw groove portions in a continuous manner with the pair of screw groove portions, and being screw-coupled to the pair of screw groove portions of the blind bolt. A fastening nut pressed against one of the members to be fastened;
It is fitted to a shaft portion close to the head of the blind bolt, so that it can be sequentially expanded from one end,
A plurality of slits are respectively provided along the axial direction along the opening leg collar, and the shaft portion of the blind bolt is continuously fitted to the opening leg collar, and inserted into the expanded leg opening collar. And a resin insert that is crushed by being pressed against the surface of the member to be fastened in this state.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an example of a fastener according to an embodiment of the present invention, and FIG. 2 is a front view showing a state where the fastener is assembled.

This fastener 10 is used as a pair of members to be fastened, for example, to fasten the ends of a pair of folded plates 20 formed in a corrugated shape, and a head is attached to one end of the shaft 11a. A blind bolt 11 provided with a blind nut 11b, and a tightening nut 12 screwed to the blind bolt 11
And

A pair of folded plates 20, which are mutually confronted by the fastener 10 of the present invention, are provided with continuous wavy portions having a trapezoidal cross section, and their respective ends are fitted in a fitted state. Are superimposed on each other. Further, through-holes 21 are provided at ends of the folded plates 20 which are overlapped with each other, and when the ends of the folded plates 20 are overlapped with each other, the through-holes 21 are aligned. To face each other.
The blind bolts 11 are arranged such that the ends of the pair of folded plates 20 are aligned with each other when the ends of the pair of folded plates 20 are overlapped in a state where the head 11b is arranged in the concave portion of the corrugated portion at the end of each folded plate. It is inserted into the hole 21.

FIG. 3 is a front view of the blind bolt 11. The blind bolt 11 is provided at a straight shaft portion 11a, a truncated cone-shaped head 11b provided at one end of the shaft portion 11a, and at the other end of the shaft portion 11a. And a quadrangular prism-shaped chucking portion 11c. The head 11b has a constant outer diameter at an end close to the shaft 11a, and the outer diameter decreases gradually as the head 11b is apart from the shaft 11a except for the end.

In the chucking portion 11c having a square cross section provided at the tip of the shaft portion 11a, each diagonal line in the cross section is along the diameter of the shaft portion 11a, and the length of each diagonal line is equal to that of the shaft portion 11a. Is equal to the diameter. A tightening nut 12 is provided at each corner of the chucking portion 11a.
11d are formed respectively.

The chucking portion 11c of the shaft portion 11a
A screw groove 11e to which the tightening nut 12 is screwed is provided over an appropriate length at an end close to the screw nut 11 and the screw nut 11e is inserted into the screw groove 11e through a cutting groove 11f. 11g are provided continuously so as to be screw-coupled. A reverse thread groove 11h is provided in a direction opposite to the thread groove 11g, continuing from the thread groove 11g provided at the center of the shaft portion 11a. A thread groove is not provided over an appropriate length on an outer peripheral surface of an end portion of the shaft portion 11a adjacent to the head portion 11b.

As shown in FIGS. 1 and 2, an open leg collar 13 made of a metal such as stainless steel is fitted to the shaft 11a of the blind bolt 11 at an end close to the head 11b. ing. The open leg collar 13 is formed in a cylindrical shape by a metal such as stainless steel, and has four slits 13 opened at one end on its peripheral surface.
a are formed at equal intervals in the circumferential direction. The intervals at the inner depths of the slits 13a are widened. The open leg collar 13 has an end where the opening of each slit 13a is located.
It is fitted to the shaft 11a of the blind bolt 11 so as to be located on the far side of the first head 11b.

The shaft portion 11a of the blind bolt 11 has
The synthetic resin insert 1 is connected to the open leg collar 13.
4 are fitted. The insert 14 has a cylindrical shape, and has a flange 14a at one end. And the flange portion 14a is the blind bolt 1
The insert 14 is fitted to the shaft portion 11a of the blind bolt 11 in a state where the insert 14 is located on the far side of the first head 11b.

The blind bolt 11 is provided with an open leg collar 13.
In a state where the insert 14 is continuously fitted to the shaft portion 11a, each folded plate 2 is positioned so that the head 11b is located within the concavely concave waveform of the pair of folded plates 20 that are overlapped with each other.
0 are inserted through the through holes 21 respectively provided.

On the shaft portion 11a of the blind bolt 11,
The waterproof packing 15 fitted to the shaft portion 11a protruding from the through hole 21 of the folded plate 20 is fitted. The waterproof packing 15 is formed in a disk shape by an elastic body such as rubber, and a shaft portion 11a of the blind bolt 11 is inserted through a center portion thereof.

An aperture washer 16 made of a metal plate such as a stainless steel plate is fitted to the shaft 11a of the blind bolt 11 protruding from the waterproof packing 15. The aperture washer 16 is used for the waterproof packing 1
5 and has a disk shape with a diameter larger than that of the waterproof packing 15.
It is configured in the shape of a truncated cone protruding in a direction away from the center.

A fastening nut 12 is screwed to a shaft 11a of the blind bolt 11 protruding from the aperture washer 16. As the tightening nut 12, a normal hexagon nut is used.

The fastener 10 having such a configuration is used as follows. First, the shaft 11 of the blind bolt 11
a, the open leg collar 13 and the insert 14 are fitted in order. Then, the ends of the pair of folded plates 20 are overlapped with each other, and the through holes 21 provided at the ends of the folded plates 20 are provided.
When they are aligned with each other, the shaft portion 11 of the blind bolt 11 in which the opening leg collar 13 and the insert 14 are fitted.
a is inserted into each through-hole 21 with the head 11b located inside the concave portion of each folded plate 20 in a concave shape.

Then, a pair of folded plates 20 stacked on each other
The waterproof packing 15 and the squeezing washer 16 are sequentially fitted to the shaft portion 11a of the blind bolt 11 protruding from the outer surface of the blind bolt 11, and abut the surface protruding outside the folded plate 20. Then, the tightening nut 12 is connected to each of the screw grooves 11 provided in the chucking portion 11 c of the blind bolt 11.
d is screwed.

In such a state, the chucking portion 11c of the blind bolt 11 is moved in a state where the fastening nut 12 is prevented from rotating by a tool such as a spanner.
It is clamped and rotated by an appropriate special tool. As a result, the fastening nut 12 is attached to the blind bolt 1
The screw is sequentially fed into one screw groove 11 e, comes into contact with the aperture washer 16, and is pressed against the surface of one folded plate 20 via the aperture washer 16 and the waterproof packing 15.

Thereafter, when the blind nut 11 is further rotated while the tightening nut 12 is stopped, and the tightening nut 12 is screwed in, the blind bolt 11
The entire blind bolt 11 is slid so that its head 11b approaches the tightening nut 12, and the flange portion 14a of the insert 14 is strongly pressed against the surface of the other folded plate 20. In this state, when the tightening nut 12 is further prevented from rotating and the blind bolt 11 is rotated to tighten the tightening nut 12, the split leg collar 13 and the insert fitted to the shaft portion 11a of the blind bolt 11 are inserted. 14 is pressed against the surface of the folding plate 20, the tip of the open leg collar 13 is expanded, and the insert 14 is fitted into the open leg collar 13.

In such a state, the blind bolt 11
When the tightening nut 12 is further tightened by the rotation of, the flange portion 14a of the resin insert 14 is pressed against the surface of the folded plate 20 by the base end portion of the open leg collar 13, and as shown in FIG. The insert 14 is compressed by the inner peripheral surface of the open leg collar 13 and the surface of the folded plate 20, and is crushed so as to bulge outward. After that, when the tightening of the tightening nut 12 is continued, the distal end of the open leg collar 13 is brought into pressure contact with the surface of the folded plate 20.

In such a state, the tightening nut 12
Passes through the thread groove 11e of the blind bolt 11 and the cutting groove 11f, and is screwed to the thread groove 11g at the center of the shaft 11a. Then, in this state, when the tightening nut 12 is further tightened by rotating the blind bolt 11, the tightening nut 12 becomes a shaft portion 11a of the blind bolt 11.
Over the cutting groove 11f provided in the screw groove 1
It is screw-coupled to 1 g and further reaches the reverse screw groove 11 h. As a result, the fastening nut 12 is attached to the reverse thread groove 1.
It is locked at 1h, locked so as not to rotate with respect to the blind bolt 11, and integrated with the blind bolt 11.

As described above, when the tightening nut 12 is integrated with the blind bolt 11 and a rotational force is applied to the tightening nut 12 by further rotating the blind bolt 11, the blind is prevented from rotating by a special tool. A large shearing force is applied between a portion of the bolt 11 closer to the tip end than the cutting groove 11f and a portion of the shaft portion 11a closer to the head 11b than the cutting groove 11f, to which the fastening nut 12 is screw-coupled. The bolt 11 is, as shown in FIG.
It is cut at the point f.

Shaft 11a of blind bolt 11
The fastener 10 whose tip is cut off has an insert 14 strongly pressed against the surface of one folded plate 20 by the open leg collar 13 and the other folded plate 20 by the fastening nut 12.
With the waterproof packing 15 strongly pressed against the surface of
The folded plates 20 that are overlapped with each other are firmly pressed against each other. Moreover, since the tightening nut 12 is locked by the reverse thread groove 11 in the shaft portion 11a of the blind bolt 11, there is no risk of loosening due to vibration or the like, and the folded plates 20 are stably fastened to each other for a long period of time. be able to.

Moreover, the shaft 11 of the blind bolt 11
In the case of a, the protruding length of the shaft portion 11a of the blind bolt 11 from the tightening nut 12 is shortened because the distal end portion is removed, and therefore, the appearance of the folded plates 20 fastened to each other is reduced. Significantly improved. Further, since the projection length of the blind bolt 11 from the tightening nut 12 is short, the siding plates constituting the outer wall of the building are overlapped with each other in a place where a person can pass. Even if it is used for fastening in a state, the tip of the shaft portion 11a of the blind bolt 11 can be safely used without a risk that a pedestrian may be hurt.

[0029]

As described above, the fastener of the present invention can be firmly fastened in a state where the members to be fastened are securely prevented from loosening. In addition, when the member to be fastened is fastened, the amount of protrusion of the shaft portion of the blind bolt from the fastening nut is reduced, and the appearance and safety are significantly improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of an embodiment of a fastener according to the present invention.

FIG. 2 is a front view of the assembled fastener.

FIG. 3 is a front view of a blind bolt used for the fastener.

FIG. 4 is a front view showing one process when fastening the folded plates with the fastener.

FIG. 5 is a front view showing a state in which folded plates are fastened to each other by the fastener.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fastener 11 Blind bolt 11a Shaft part 11b Head 11c Chucking part 11d Screw groove part 11e Screw groove part 11f Cutting groove part 11g Screw groove part 11h Reverse screw groove part 12 Tightening nut 13 Opening collar 14 Insert 15 Waterproof packing 16 Draw washer 20 Fold Plate 21 Through hole

Claims (1)

[Claims] A head is provided at one end of a shaft portion penetrating at least a pair of members to be fastened to each other, and a chuck having a polygonal cross section is provided at the other end of the shaft portion. In addition, a pair of thread grooves each extending in the same direction are provided on the shaft portion through the cutting groove, and the shaft portion is continuous with the pair of thread grooves. Then, a blind bolt provided with a reverse screw groove portion extending in a direction opposite to the pair of screw groove portions, and screw-coupled to the pair of screw groove portions of the blind bolt, and pressed against one of the members to be fastened. A tightening nut, which is fitted to a shaft portion close to the head of the blind bolt, so that it can be sequentially expanded from one end,
A plurality of slits are respectively provided along the axial direction, and an open leg collar which is continuously fitted to the shaft portion of the blind bolt, and is inserted into the expanded open leg collar. And a resin insert that is crushed by being pressed against the surface of the member to be fastened in the engaged state.