JP2017032114A - Blind bolt type fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blind bolt type fastener capable of performing an installation operation only from one side position of a target structure toward a left side direction.SOLUTION: A bolt 5 is passed into a hollow part of an outer cylinder 53 with an outer diameter enabling it to be inserted into an open hole 32a and a bolt 50 is configured to have a longer setting than a length L2 of the outer cylinder 53. A position setting stopper piece 54 having a rotating radius engaged with a rear surface side of a wall plate 31 provided with an open hole 31a by a rotating shaft 55 arranged to be crossed with an axis line of the bolt 50 at a right angle is rotatably attached to an extremity end portion of the bolt 50 with its position of eccentric weight amount at the rotating shaft 55. An operator's side end part of the bolt 50 is formed with a male thread part 50a and a nut member 51 is screwed into the male thread part 50a. The length L2 of the outer cylinder 53 is approximately the same as a distance L1 from an operator's side surface of a wall plate 31 provided with a small-diameter open hole 31a to the outer surface of the wall plate 32 at the bolt insertion side so as to cause the extremity end of the outer cylinder 53 to be abutted against it.SELECTED DRAWING: Figure 1

Description

  For example, as shown in FIG. 3, the present invention has an existing closed cross-section structure, particularly a hollow structure 2 having a plurality of partition plates and the like (not shown in FIG. These are referred to as target structures), and installation work can be performed only from the position of one side (right side in FIG. 3) toward the left side of the target structure. Installation holes 32a and 31a are provided, and installation work is performed by firmly fixing the bolts 50 from the right position to the left through the bolts 50 to the holes 32a and 31a. It belongs to the technical field of so-called blind bolt type fasteners, which can be used when subjected to severe restrictions.

An operator cannot enter (or cannot enter) the left side of FIG. 3 above, and a bolt hole is provided in the target structure 2 only from the right side, or from the right side only to the left. Even if each work such as passing the bolt 50 is restricted, there are various cases where it is desired to clear the restriction and install the bolt and use it for various purposes and applications.
In such a case, as the current state of the art, the use of a so-called “blind bolt” is already known. For example, as disclosed in the prior art documents 1 to 5 described below, a wide variety of known methods are available. There are also many types.

JP 2005-61490 A JP 2006-226295 A JP 2011-133077 A JP 2012-145127 A Japanese Patent No. 3532559

  However, as in the case described with reference to FIG. 3, a blind bolt having a configuration that can achieve the purpose by firmly and firmly installing the bolt 50 on the target structure 2 even under conditions subject to severe work restrictions. I don't see it at the moment. For this reason, those who have no choice but to work under the above conditions are struggling to carry out such installation work.

This is because the known fasteners called so-called blind bolts, which are found in the inventions disclosed in the above-mentioned Patent Documents 1 to 5, are the most viewed from the standing position of the operator with respect to the target structure. This is because there is only a configuration in which a reaction force is applied to the back side of one wall plate (32 in the example of FIG. 3) at the near side position.
Bolts that have been passed through bolt holes provided in the plurality of wall plates 32 and 31 of the target structure 2 illustrated in FIG. 3 are provided with second or third through holes as viewed from the operator's position. There is currently no blind bolt that can be installed firmly by using a reaction force on the back side of the wall plate. Therefore, it is inconvenient because it cannot respond to such work.

Incidentally, in all of the configurations of the known blind bolts disclosed in each of the above patent publications 1 to 5, at the beginning of use, the user attaches a stopper piece that is rotatably attached to the tip of the bolt. In such a configuration, the posture that is rotated to a position in the same direction as the center line of the bolt is temporarily supported and inserted into the through hole while maintaining this temporary support posture. Therefore, the stopper piece must be released immediately after passing through the through-hole, and the configuration is only to exert the stopper function on the back side wall surface of the through-hole.
Therefore, the reaction force required for installing the bolt cannot be obtained on any desired wall plate deeper (back side) than the wall plate that has passed through the first through hole counted from the position of the operator.

  An object of the present invention is to provide a through-hole in a direction perpendicular to the outer wall plate to an existing structure or an article such as an article that is partitioned into a plurality of outer wall plates and / or internal partition plates. Bolts inserted and inserted into the through-hole can be fixed and installed on the rear side of the wall plate or partition plate at the rear side position required when viewed from the front side. It is to provide a blind bolt type fastener having a structure.

As means for solving the above problems, a blind bolt type fastener 5 according to the invention described in claim 1 is:
Bolt installation through holes 31a, 32a are provided in series on a common center line in the plurality of wall plates 31, 32, etc. of the target structure 3 where the bolt 50 is to be installed,
The bolt 5 is passed through the hollow portion of the outer cylinder 53 having an outer diameter that can be passed through the through hole 32a, and the bolt 50 is longer than the length L2 of the outer cylinder 53.
A positioning stopper piece 54 having a radius of rotation that is hooked on the rear side of the wall plate 31 provided with the through hole 31a by a rotating shaft 55 arranged perpendicular to the axis of the bolt 50 is provided at the tip side portion of the bolt 50. The position of weight distribution is attached so that it can rotate on the shaft 55,
A male screw portion 50a is formed at the front end portion of the bolt 50, and a nut member 51 is screwed into the male screw portion 50a;
The length L2 of the outer cylinder 53 is determined from the front side surface of the wall plate 31 provided with a small-diameter through hole 31a so that the tip of the outer cylinder 53 abuts among the bolt through holes. It is almost the same as the distance L1 to the outer surface,
The positioning stopper piece 54 of the bolt 50 is rotated around its rotating shaft 55 and laid in the same direction as the center line of the bolt 50 so that it is housed in the cylinder of the outer cylinder 53 together with the bolt 50. When the cylinder 53 and the bolt 50 are passed through the through hole 32a of the wall plate 32 and the like, and the front surface of the outer cylinder 53 hits the front side surface of the wall plate 31 determined as the insertion limit position, the bolt in the outer cylinder 53 50 is protruded further forward, and the positioning stopper piece 54 is rotated by the action of the uneven weight distribution to be hooked on the rear surface of the wall plate 31 to prevent it from being pulled out.
In addition, the nut member 51 of the bolt 50 is further screwed into the end surface of the outer cylinder 53 and fixed.

The invention according to claim 2 is the blind bolt type fastener according to claim 1,
The nut member 51 screwed into the male screw portion 50a at the front end portion of the bolt 50 is provided with a jig 52 having a structure corresponding to the purpose of use.

The invention according to claim 3 is the blind bolt type fastener according to claim 1 or 2,
The positioning stopper piece 54 is positioned in the same direction as the axis of the bolt 55 in a range where the positioning stopper piece 54 is rotated around the rotating shaft 55 arranged perpendicular to the axis of the bolt 50. A slot 56 having a groove width and a length that can be stored is provided,
It is characterized in that a positioning protrusion 57 or 57 ′ is provided to temporarily hold the positioning stopper piece 54 when the positioning stopper piece 54 is stored in the axial direction of the bolt 50 along the long slot 56. To do.

The invention according to claim 4 is the blind bolt type fastener according to any one of claims 1 to 3,
The shaft hole of the rotary shaft 55 that rotatably attaches the positioning stopper piece 54 to the tip end portion of the bolt 50 is formed long in the axial direction of the bolt 50 as a long hole 58 having a length suitable for the operation of rotating and storing the positioning stopper piece 54. It is characterized by being.

The blind bolt type fasteners according to the inventions described in claims 1 to 4 are composed of a plurality of wall plates and / or internal partition plates (not shown), for example, illustrated in FIGS. It can use suitably, when installing a volt | bolt to the volt | bolt installation target position of the outer wall boards 31 and 32 of such a target structure 3. FIG.
In other words, when subject to the restriction of working at a work position that can be ensured only at one side portion of the target structure 3 (right side portion of FIGS. 2 and 3), the opposite side wall plate 32 of the target structure 3 is opposite. Regardless of the number of partition walls inside the wall plate 31 on the side, through holes 32a having a diameter that allows the outer cylinder 53 to pass therethrough are arranged in a series using a drill or the like (a common center line) ).
However, the wall plate 31 at the insertion limit position where the tip of the outer cylinder 53 is not abutted and passed is provided with a through hole 31a having a diameter through which the bolt 50 is passed, although the outer cylinder 53 is not passed.
On the other hand, the nut member 51 is screwed to an appropriate position into the male threaded portion 50a at the front end (head side) of the bolt 50, and the positioning stopper piece 54 attached to the tip of the bolt 50 is rotated. By rotating the shaft 55 around the shaft 55 and laying it down along the axial direction of the bolt 50, if it is inserted into the outer tube 53 together with the bolt 50 as it is, preparation for installation can be made.
Therefore, the wall plate 31, 32 of the target structure 3 (closed cross-section structure in the illustrated example) is held in the hand so as to maintain the combined state of the outer cylinder 53 and the nut member 51 of the blind bolt type fastener 5. Are inserted from the front-side through hole 32a prepared toward the front through-hole 31a.

Thus, the front end (left end in FIG. 2) of the outer cylinder 53 advances toward the through hole 31a of the left wall plate 31, and the bolt 50 incorporated in the outer cylinder 53 is inserted and installed.
As shown in FIG. 2A, when the front end (left end) of the outer cylinder 53 comes into contact with the front side surface of the left wall plate 31 and stops, when the bolt 50 built in the outer cylinder 53 is pushed forward, the outer cylinder 53 comes out of the outer cylinder 53. The stopper piece 54 that has lost its restraining force rotates about 90 degrees due to the uneven weight effect, and enters the hanging state shown in FIG. 2B.
Then, this time, the bolt 50 is pulled to the near side. Then, as illustrated in FIG. 2C, the positioning stopper piece 54 that goes to the right together with the bolt 50 stops on the back surface (left side surface) of the wall plate 31 while being in the above-described hanging state, and is in a retaining state.
Therefore, when the nut member 51 attached to the right end of the bolt 50 is screwed in, the bolt 50 is pulled out to the right. Finally, as shown in FIG. 2C, the stopper piece 54 comes into contact with the back surface of the wall plate 31 and is necessary and sufficient. The nut member 51 can be tightened by obtaining a reaction force, and a firm installation state of the bolt 50 can be established.
That is, even if the target structure 3 has a configuration in which several partition wall plates or the like are provided therein, the bolt 50 can be securely and securely installed according to the above procedure. Can be achieved.

  For example, the use purpose such as passing the wire 4 into the circular ring 52 as shown in FIG.

AC is the perspective view which showed the main operation procedure in the case of using the blind volt | bolt type | mold fastener by this invention in steps. FIGS. 4A to 4C are partially cutaway front views sequentially illustrating a use procedure for installing a blind bolt type fastener according to the present invention on a target structure. It is the perspective view which partially fractured and showed the use condition of the blind volt | bolt type | mold fastener by this invention. It is the front view which fractured | ruptured and showed the different Example of the blind volt | bolt type | mold fastener by this invention.

Bolt installation through holes 31a and 32a are provided in series on a common center line in the plurality of wall plates 31 and 32 of the target structure 3 on which the bolt 50 is to be installed.
The bolt 5 is passed through the hollow portion of the outer cylinder 53 having an outer diameter that can be passed through the through hole 32a. The bolt 50 is configured to be longer than the length L2 of the outer cylinder 53.
A positioning stopper piece 54 having a turning radius that is hung on the rear side of the wall plate 31 provided with the through hole 31a by a rotating shaft 55 arranged orthogonal to the axis of the bolt 50 is provided at the tip side portion of the bolt 50. The position of the uneven weight distribution is attached so as to be rotatable about the shaft 55.
A male screw portion 50a is formed at the front end portion of the bolt 50, and the nut member 51 is screwed into the male screw portion 50a.
The length L2 of the outer cylinder 53 is such that the wall plate 32 on the bolt insertion side has a length L2 from the front side surface of the wall plate 31 provided with a small-diameter through hole 31a so that the tip of the outer cylinder 53 abuts among the bolt through holes. The distance L1 is almost equal to the distance L1 to the outer surface.
The positioning stopper piece 54 of the bolt 50 is rotated around the rotation shaft 55 and laid in the same direction as the center line of the bolt 50, and is housed in the cylinder of the outer cylinder 53 together with the bolt 50.
When the outer cylinder 53 and the bolt 50 are passed through the through holes 32a of the wall plate 32 and the like, and the front surface of the outer cylinder 53 hits the front side surface of the wall plate 31 determined as the insertion limit position, The bolt 50 is further protruded forward, and the positioning stopper piece 54 is freely rotated by the function of the uneven weight distribution, and is put on the rear surface of the wall plate 31 so as to be prevented from coming off.
Then, the nut member 51 of the bolt 50 is screwed in as much as necessary, and is brought into pressure contact with the end surface of the outer cylinder 53 and fixed.

Below, the blind bolt type fastener 5 of this invention is demonstrated based on the illustrated Example.
The illustrated embodiment shows a tubular hollow structure that is long in the vertical direction as an example of the target structure 3 to which the blind bolt type fastener 5 according to the present invention is applied.
In particular, the object structure 3 can secure a working space or a scaffold only at the right position in FIG. 2, and the worker can make the blind bolt type only in one direction from the same position toward the left in FIGS. 2 and 3. The case where it is permitted to advance the work and installation of using the fastener 5 is shown.
In the present embodiment, the illustration of the internal partition plate and the like is omitted, and through holes 32a and 31a for installing the blind bolt type fasteners 5 are respectively provided on the left and right wall plates 31 and 32 of the target structure 3 above. Use a drill or the like to provide a series of arrangements.
However, each of the through holes 31a and 32a can pass through the bolt 50, but the outer cylinder 53 incorporating the bolt 50 can pass through the through hole 32a of the wall plate 32 at the right position, but the left wall plate. The outer cylinder 53 cannot be passed through the 31 through-hole 31a.
The diameter of the through hole 31a of the left wall plate 31 is larger than that of the bolt 50 so that the left end of the outer tube 53 abuts against the front side surface (inner surface) of the left wall plate 31 and stops. The configuration is smaller than the outer diameter.

On the other hand, as shown in FIGS. 2A to 2C, the bolt 50 constituting the blind bolt type fastener 5 of the present invention is stopped by the front end of the outer cylinder 53 hitting the front side surface (inner surface) of the left side wall plate 31. Furthermore, it is configured such that it easily passes through the through hole 31a of the left wall plate 31 and protrudes to the left of the left wall plate 31 to a certain length.
The certain length of protrusion to the left here means that the entire length of the positioning stopper piece 54 rotatably attached to the bolt 50 by the shaft 55 is the passage of the left wall plate 31 as clearly shown in the comparison between FIGS. 2A and 2B. The length until the positioning stopper piece 54 can rotate through the eccentric weight effect and hang in a substantially vertical state through the hole 31a.
More specifically, when the distance between the outer surfaces of the left and right wall plates 31 and 32 of the target structure 3 is about 80 mm, the length L2 of the outer cylinder 53 is set to the both wall plates 31 and 32. The length is approximately the same as the interval of 80 mm.
The inner diameter of the outer cylinder 53 is configured to be about 14 mm so that the bolt 50 can be easily penetrated when the outer diameter of the bolt 50 is, for example, φ12 mm.
On the other hand, the outer diameter D of the outer cylinder 53 is formed larger than the diameter of the through hole 31a provided in the left wall plate 31 that should be a dead end, and the outer cylinder 53 abuts against the inner side surface of the left wall plate 32 and securely stops. It is supposed to be configured. Of course, the diameter of the through hole 32a provided in the right wall plate 32 is sufficiently larger than the outer diameter of the outer cylinder 53, and the right end of the outer cylinder 53 that has passed through the through hole 32a is provided for the convenience of work. Further, the length is configured to protrude slightly to the right from the outer surface of the right wall plate 32.

The bolt 50 passed through the hollow portion of the outer cylinder 53 is passed through a bolt 50 longer than the length L2 of the outer cylinder 53 by a certain dimension as will be described later. In the case of the illustrated embodiment, the length of the bolt 50 is about 150 mm, and a male screw 50a is formed in the range of about 40 mm at the right end thereof, and the nut member 51 is screwed therein.
Next, a positioning stopper piece 54 is rotatably attached to a tip portion (left end portion in the drawing) of the bolt 50 by a rotating shaft 55 arranged orthogonal to the axis of the bolt 50.
The illustrated positioning stopper piece 54 is formed by processing a steel plate having a width narrower than the inner diameter of the outer cylinder 53 (and not more than the same diameter as the shaft diameter of the bolt 50).
For easy understanding of the description of FIG. 3, a long groove 56 having a width and length capable of loosely and rotatably accommodating the positioning stopper piece 54 is formed at the tip portion of the bolt 50, and the bolt 50 is inserted into the long groove hole 56. The positioning stopper piece 54 is rotatably attached to a rotating shaft 55 so that the positioning stopper piece 54 can be rotated and stored in a posture along substantially the axis.
In this case, the position at which the positioning stopper piece 54 is supported by the rotating shaft 55 is such that the position of the eccentric weight distribution in which about one half is heavy in the weight distribution when the positioning stopper piece 54 is viewed in the length direction can be rotated by the rotating shaft 55. is set up. Accordingly, when the positioning stopper piece 54 is exposed to the outside as shown in FIG. 1C and loses the binding force from the state in which it is housed in the cylinder of the outer cylinder 53 as shown in FIG. As a result, the rotary shaft 55 rotates around the rotation shaft 55 and is orthogonal to the axis of the bolt 50.

The positioning stopper piece 54 is further formed with a rectangular notch 54a at the front edge in the rotational direction of the heavy tip end portion with the rotation shaft 55 as the center (FIGS. 1A and 1C). reference).
On the other hand, the bolt 50 is closer to the tip than the position of the rotation shaft 55 of the positioning stopper piece 54, and the notch 54a is just at the position where the notch 54a rotates and approaches. A groove portion 56 that houses and holds the notch portion 54a is formed at the abutting position. As a result, as shown in FIG. 1B, the positioning stopper piece 54 is configured to fit in the hollow portion of the outer cylinder 53 (see FIG. 1B).
Thus, as shown in FIG. 1B, in the retracted state in which the positioning stopper piece 54 is rotated until it is in the same direction as the axis of the bolt 50, the notch portion 56a is just the relief groove 56 formed at the corresponding position of the bolt 50. This is a configuration that fits and meshes within the range of the outer diameter of the bolt 50.
As shown in FIG. 3B, the positioning stopper piece 54 positioned and held in the storage state along the axis of the bolt 50 as described above is set in the storage posture inserted into the cylinder of the outer cylinder 53 and thereafter installed and installed. This is convenient for the operations.

  As described above, with respect to the rotating shaft 55 that rotatably supports the positioning stopper piece 54, the shaft hole 58 provided in the bolt 50 to support the rotating shaft 55 is a simple circular shaft hole as shown in FIG. 1A. As shown in FIG. 2A, it is convenient to use an oval shape slightly longer in the axial direction of the bolt 50. The intent is that the positioning stopper piece 54 is operated to the storage posture along the axis of the bolt 50 as shown in FIG. 2A, or the notch portion 54a is fitted to the positioning protrusion 57 (FIG. 2A) to stabilize the storage posture. This is because the operability is extremely easy (free) and easy to handle during the holding operation.

Next, as an embodiment having a different configuration in which the positioning stopper piece 54 is installed at the rotating shaft 55 at the tip portion of the bolt 50, as illustrated in FIG. 1A, a long groove hole 56 is provided in the axial direction of the bolt 50. It is possible to implement a configuration in which the long slot 56 is installed.
Alternatively, a flat surface portion 60 (see FIG. 4) equivalent to the groove wall of one half of the long groove hole 56 being cut to the tip is formed, and the positioning stopper pieces 54 are arranged in parallel along the flat surface portion 60 to form the long groove hole. A configuration in which the positioning stopper piece 54 is rotatably installed by the rotation shaft 55 that is passed through 58 can be similarly implemented.
In the case of the embodiment shown in FIG. 4, a support shaft in which a positioning protrusion 57 ′ for fitting the notch 54 a of the positioning stopper piece 54 is installed at the tip portion of the bolt 50 in a cantilevered state in the same direction as the rotary shaft 55. It is convenient to provide the projection as a state.

As shown in FIGS. 2A and 2B, the outer cylinder 53 having the above-described configuration is formed with respect to the distance L1 (FIG. 2A) between the left and right wall plates 32 and 31 of the target structure (hollow structure column 3). With the left end abutting against the right inner surface (inner surface) of the left wall plate 31 of the hollow structure column 3, the right end of the outer cylinder 53 penetrates the through hole 32a provided in the right wall plate 32 and outward (right ) Is projected and produced to a length of at least about 2 mm (about 82 mm in the above example of dimensional specifications). This is because the tightening by the nut member 51 functions reliably.
On the other hand, the length of the bolt 50 is, for example, according to the embodiment of FIGS. 2A and 2B, the tip (left end) of the outer cylinder 53 abutted against the right inner surface of the left wall plate 32 of the hollow structure column 3 as described above. In the state, the right side portion of the bolt 50 still protrudes from the right end of the outer cylinder 53 to the right and has a sufficient length necessary for subsequent operations.
As shown in FIG. 2A, in this blind bolt type fastener, the nut member 51 is screwed into a male screw portion 50a formed at the right end portion of the bolt 50 to an appropriate position, and a screwing length that is necessary and sufficient for the subsequent tightening operation. The tip of the bolt 50 and the positioning stopper piece 54 are moved to the left side of the hollow structure column 3 from the through hole 32a processed in the hollow structure column 3 to be applied. Aim and insert toward the through hole 32a.

  When the front surface (left end surface) of the nut member 51 screwed into the male threaded portion 50a on the right end side portion of the bolt 50 is pushed in until it comes into close contact with (abuts against) the right end of the outer tube 53, as shown in FIG. The front end side of the bolt 50 protruding from the left end position of 53 protrudes to the outside of the left side wall plate 32 of the hollow structure column 3. Then, the positioning stopper piece 54 protrudes to the position where the rear end protrudes outside the left wall plate 31 of the target structure 3. Accordingly, the positioning stopper piece 54 that has lost the restraint by the outer cylinder 53 rotates and hangs due to the effect of the eccentric weight effect (FIG. 2B).

The above state change can be confirmed by, for example, the sense of the user's hand holding the nut member 51. Therefore, the user pulls the bolt 50 strongly to the right, and brings the positioning stopper piece 54 into contact with the outer surface of the left wall plate 31 of the target structure 3 as illustrated in FIG. 2C. Thereafter, the nut member 51 is rotated and tightened within the range of the length of the male screw 50a.
At this time, as already shown in FIG. 2C, the positioning stopper piece 54 is in a state where it is strongly abutted against the left side wall plate 32 of the hollow structure column 3 and is prevented from rotating. The bolt-type fastener 5 is firmly installed.

  Accordingly, the operator confirms the operation of the stopper piece 54 by the feeling of the hand holding the bolt 50 and confirms the complete installation state of the blind bolt type fastener 5. In addition, various work objectives can be achieved by directly using the nut member 51 at the right position or by using the jig 52 attached to the nut member 51. Alternatively, the illustrated ring-shaped jig 52 can be used for the intended purpose.

  Although the present invention has been described based on each embodiment and the like, the present invention is not limited to the configuration of each embodiment described above. It should be noted that the scope of the present invention also includes the scope of various changes, applications, and uses that are performed by those skilled in the art as needed.

3 Target Structure 31 Wall Plate 32 Wall Plate 31a Through Hole 32a Through Hole 5 Bolt Type Fastener 50 Bolt 50a Male Threaded Part 51 Nut Member 52 Jig 53 Outer Cylinder 53b Flange 53c Flange 54 Positioning Stopper Piece 55 Rotating Shaft 56 Long Groove Hole 57 Positioning protrusion

Claims (4)

Bolt installation holes are provided in series on a common center line on a plurality of wall plates of the target structure where the bolts are to be installed,
A bolt is passed through the hollow portion of the outer cylinder having an outer diameter that can be passed through the through hole, and the bolt is configured to be longer than the length of the outer cylinder.
A positioning stopper piece having a turning radius that is hooked on the rear side of the wall plate provided with the through hole by a rotating shaft arranged perpendicular to the axis of the bolt at the tip side portion of the bolt is positioned on the position of the eccentric weight distribution. Is attached to be rotatable,
A male screw portion is formed at the front end portion of the bolt, and a nut member is screwed into the male screw portion;
The length of the outer cylinder is approximately equal to the distance from the front side surface of the wall plate provided with a small-diameter through hole so that the tip of the outer cylinder abuts among the bolt through holes to the outer surface of the wall plate on the bolt insertion side. Are equivalent,
In the state where the bolt positioning stopper piece is rotated around its rotation axis and laid in the same direction as the center line of the bolt and is housed in the cylinder of the outer cylinder together with the bolt, the outer cylinder and the bolt are At the stage where the front surface of the outer cylinder hits the front side of the wall plate that is set as the insertion limit position, the bolt in the outer cylinder is protruded further forward to displace the positioning stopper piece. Rotated by the action of weight distribution, it is hung on the back side of the wall board and it is in a state to prevent it from coming off,
In addition, a blind bolt-type fastener, wherein the nut member of the bolt is further screwed into and fixed to the end surface of the outer cylinder.   The blind bolt type fastener according to claim 1, wherein a jig having a structure corresponding to a purpose of use is provided on a nut member screwed into a male screw portion at a proximal end portion of the bolt. At the tip of the bolt, within the range where the positioning stopper piece can be rotatably mounted by the rotating shaft arranged orthogonal to the axis of the bolt, the groove width and length of the positioning stopper piece can be accommodated in the axial direction of the bolt. A long slot is provided,
A positioning stopper piece is rotatably installed in the same long groove hole by a rotating shaft arranged perpendicular to the axis of the bolt, and when the positioning stopper piece is housed in the axial direction of the bolt along the long groove hole, the same positioning is performed. The blind bolt type fastener according to claim 1 or 2, wherein a positioning projection for temporarily holding the storage state of the stopper piece is provided.   The shaft hole provided in the bolt to pass the rotating shaft that rotatably mounts the positioning stopper piece to the tip end portion of the bolt is formed as a long hole having a length suitable for the rotation and storing operation of the positioning stopper piece and is elongated in the axial direction of the bolt. The blind bolt type fastener according to any one of claims 1 to 3, wherein the fastener is a blind bolt type fastener.

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