JP2004150604A - Fitting for forming blind bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting for forming a blind bolt using a conventional bolt. <P>SOLUTION: The fitting 10 comprises a slender body 13 having a pair of side portions 12 opposed to a bottom portion 11, a first cutout portion 15 cut out of the bottom portion 11 at the middle of the body 13 and of both sides 12 ranging thereto for a head portion of the bolt to be seated, a second cutout portion 16 located apart from the first cutout portion 15 in the axial direction and cut out of the bottom portion 11 and of both sides 12 ranging thereto for the head thereof to be seated, and a bottom opening portion 18 for communicating the open bottom of the first cutout portion 15 with the open bottom of the second cutout portion 16. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a metal fitting for forming a blind bolt which is inserted into a through hole communicating with a closed space to mount a member, and particularly uses a general head bolt or a combination of a full screw bolt and a nut which are commercially available in large quantities. And a metal fitting which can be attached with high strength and is suitable for forming a wide range of blind bolts.
[0002]
[Prior art]
For example, when mounting brackets, handrails, rain gutters, distribution boards, etc. on the surface of members such as building structural members and interior members, first attach bolts serving as anchors to the members, and then use the attached bolts to Brackets are attached. A general method of mounting a bolt is to open a through hole in a member such as a plate material, insert a shaft portion of the bolt from the back side of the through hole, and insert the shaft portion protruding to the front side into a mounting hole such as a bracket. And fasten with nuts.
[0003]
However, there are cases where a hand can be inserted through the back of the through hole to penetrate the bolt.For example, the wall behind the hole or the rectangular pipe used for pillars or beams, etc., has a closed space behind the hole drilled in them. Therefore, the bolt cannot be inserted into the through hole from the back side. Further, even if the back space is not a closed space, if the gap on the back side is small, the bolt cannot be similarly inserted from the back side into the through hole.
Therefore, blind bolts that can be inserted and attached from the front side of a through hole communicating with a closed space or the like have been widely used.
[0004]
FIG. 7 shows an example of a conventional blind bolt generally commercially available. The blind bolt 1 comprises a shaft portion 2 and a hanger 4 which is rotatably attached to a tip portion of the shaft portion 3 with a pin 3. An outer thread portion 5 for screwing a nut (not shown) to a rear outer peripheral surface of the shaft portion 3. Is formed. The hanger 4 is supported by the pin 3 slightly deviated to one side from the center in the axial direction.
[0005]
In order to attach the blind bolt 1 to the through hole communicating with the closed space, first, the hanger 4 is turned so that the axis of the hanger 4 coincides with the axis of the shaft portion 2. Next, the tips are inserted into the through holes from the front side, and when the shaft 2 is rotated around the axis, the hanger 4 is turned at right angles due to imbalance around the pin 3. When the shaft portion 2 is pulled toward the front side of the through hole in this state, the hanger 4 comes into contact with the back side of the through hole. Next, a bracket or the like is attached to the shaft portion 2 and fastened with a nut.
Furthermore, the inventions of the following patent documents are known.
[0006]
[Patent Document 1]
JP-B-43-24606 [Patent Document 2]
Japanese Patent Publication No. 40-28963
[Problems to be solved by the invention]
However, since the conventional blind bolt 1 has a structure in which the hanger 4 is pivotally supported on the shaft portion 2 by the pin 3, the strength against pulling and shearing is limited by the pin strength. Although the strength of the pin 3 is proportional to its diameter, there is a limit in increasing the diameter due to the dimensional restrictions of the blind bolt 1.
[0008]
Further, since the conventional blind bolt 1 is configured by connecting the shaft 2 and the hanger 4 having a predetermined dimension selected in advance, the length of the shaft 2 cannot be freely selected according to the length of the through hole. There is. Further, the material of the shaft portion 2 of the commercially available blind bolt 1 is also selected from the standard specifications, and it is difficult to select an optimal material according to the use atmosphere and the like.
[0009]
Therefore, as a result of various studies, the present inventor has cut off the hanger portion constituting the brine bolt as an independent fitting, and combined a standard bolt, which is generally commercially available in a large amount in a desired length and material, with the fitting according to the purpose. As a result, the present inventors have found that various problems in the conventional blind bolt unit can be solved, and completed the present invention. That is, an object of the present invention is to provide such a metal fitting for forming a brine bolt.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 for solving the above problem is mounted on a bolt 30 having a shaft portion 31 and a head portion 32, and the bolt 30 is inserted from one surface of a bolt hole of a member to be mounted. After that, a metal fitting 10 for forming a blind bolt which is rotated around its head 32 and abuts on the other surface of the mounted member,
An elongated body 13 having a bottom portion 11 and a pair of side portions 12 erected vertically from both ends in the width direction;
A first cutout portion 15 for seating the head, which is cut off at the longitudinally intermediate portion of the main body 13 at the bottom portion 11 and both side portions 12 continuous with the bottom portion 11;
A second notch 16 for seating the head, which is separated from the first notch 15 in the longitudinal direction and cut off at the bottom portion 11 and both side portions 12 continuous with the bottom portion 11;
A bottom opening 18 formed by cutting the bottom 11 between the first cut 15 and the second cut 16 so as to communicate with each other, and having their bottoms elongated in the longitudinal direction; With
A bolt shaft 31 is inserted into the bottom opening 18 from the outer surface side of the bottom 11 and its head 32 is seated horizontally on the second notch 16, and the whole is inserted into the bolt hole. After inserting,
The body 13 is rotated with respect to the shaft 31 of the bolt 30 so that its head 32 is seated vertically on the first cutout 15 for forming a blind bolt. Metal fittings.
[0011]
The invention described in claim 2 is based on claim 1,
A pair of locking projections 14 protrude inward at the side portions 12 adjacent to the first notch portion 15,
Blind bolt formation in which the shaft portion 31 of the bolt 30 is locked by the pair of locking protrusions 14 and the bolt 30 is relatively rotated with respect to the main body 13 about the locking protrusion 14 as a fulcrum. Metal fittings.
[0012]
According to a third aspect of the present invention, in the second aspect, in order to facilitate the turning of the shaft portion 31, both sides of the second cutout portion 16 are extended toward the locking projections 14 and the bottom side. A metal fitting for forming a blind bolt, characterized in that an inclined notched portion 20 which is notched so as to be inclined toward is formed.
[0013]
According to a fourth aspect of the present invention, in the second or third aspect, a detent preventing means 17a for the head 32 of the bolt 30 is formed at a bottom portion adjacent to the first cutout portion 15. Metal fittings for forming blind bolts.
[0014]
In the above configuration, the bolt having the shaft and the head includes not only a standard bolt in which the shaft and the head are integrated, but also a full screw bolt having no head and a head formed by being screwed to the end thereof. It includes a nut for use.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a state of forming a blind bolt by combining a bolt with the metal fitting according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is forming a blind bolt by combining a bolt with the metal fitting according to the present invention. It is a front view showing the state where it did. The bolt 30 that can be used in combination with the metal fitting according to the present invention includes a general bolt having a shaft portion 31 and a hexagonal head 32 as shown in FIGS. This is a combination of a nut for forming a head screwed to the end portion, and an external thread portion 33 is formed on the shaft portion 31.
[0016]
1 and 2, a metal fitting 10 according to the present invention includes an elongated body 13 having a bottom part 11 having an arc-shaped cross section and a pair of side parts 12 standing upright from both ends in the width direction of the bottom part 11. Provided. Then, a pair of locking projections 14 protruding inward from the axially intermediate portions of both sides 12 of the main body 13, and one of the projections of the locking projections 14 is biased to one side in the axial direction, and the bottom 11 and the A first cutout 15 for seating the head, which is cut off, is provided on both continuous side portions 12. In addition, there is a second notch 16 for seating the head formed on the bottom portion 11 and both side portions 12 that are continuous with the bottom portion 11 from the projecting position of the locking projection 14 toward the other side in the axial direction. In addition, an elongated bottom opening 18 is provided which is continuous between the bottom opening of the first cutout 15 and the bottom opening of the second cutout 16.
[0017]
The bottom portion 11 and the pair of side portions 12 constituting the main body 13 can be integrally formed by pressing a rigid metal plate such as an iron plate, a steel plate, a stainless steel plate, and the like. As shown in FIG. Are formed in a U-shape.
[0018]
A pair of locking projections 14 protruding inward from the axially intermediate portions of both side portions 12 function to prevent spontaneous detachment of the attached bolt 30 as described later, and to function as a fulcrum when turning the bolt 30. Having. The locking projections 14 can be formed by, for example, performing punching on the side portions 12.
[0019]
The elongated bottom opening 18 is provided to allow the shaft 31 of the bolt 30 to pass through the bottom outer surface of the main body 13 in the direction of arrow A in FIG. 1 and to be rotatable as shown in FIG. The width of the bottom opening 18 (width in the direction perpendicular to the longitudinal direction of the main body 13) is the same as the inner space between the pair of side parts 12, as shown in FIG. The value is smaller than the outer shape of the portion 32.
[0020]
As shown in FIG. 2, at the end of the bottom opening 18 on the side of the first notch, a means 17a for preventing rotation of the head of the bolt is provided. The rotation preventing means 17a is formed by a rectangular notch formed in the bottom portion 11, and the included angle of two sides of the rectangular shape is set to an angle suitable for the outer periphery of the hexagonal head of the head 32 of the bolt 30.
[0021]
The first cutout 15 is provided from the bottom 11 side to the middle of the side 12, and the cutout bottom supports the lower surface of the head 32 of the bolt 30 inserted from the bottom opening 18 as described above. The head 32 is mounted so that the axis of the shaft 31 of the 30 is perpendicular to the longitudinal direction of the main body 13. FIG. 5 shows a state in which the camera is mounted in this manner.
[0022]
The second notch 16 is provided from the bottom 11 side to the middle of both sides 12. The notch depth of the both side portions 12 is deeper than that of the first notch portion 15. Then, the outer periphery of the head 32 of the bolt 30 inserted through the bottom opening 18 as described above is seated on the second notch 16, whereby the axial direction of the shaft 31 of the bolt 30 is set to the longitudinal direction of the main body 13. The head 32 is mounted so as to match the direction. FIG. 3 shows a state where the camera is mounted as described above.
[0023]
Further, as shown in FIG. 1, the first notch 16 is formed with an inclined notch 20 extending toward the locking projection 14, and the shank of the bolt 30 is formed by using the inclined notch 20. 31 can be easily turned.
[0024]
The bottom opening 18 that communicates the insertion portion 17 and the second notch 16 can be formed by any one of a direction in which the axial direction of the shaft portion 31 of the bolt 30 is perpendicular to the longitudinal direction of the main body 13 and a direction that matches the longitudinal direction. And the mounting state of the head 32 can be switched between the first cutout 15 and the second cutout 16.
[0025]
That is, the bottom opening 18 allows the shaft portion 31 of the bolt 30 to be inserted from the state where the shaft portion 31 of the bolt 30 is inserted in the direction of arrow A in FIG. When the head 32 is slightly retracted and turns in the direction of arrow B in FIG. 1 to shift to a state where the head 32 is seated in the second notch 16, it functions as a movement passage for the shaft 31.
The other function of the bottom opening 18 is, conversely, from the state where the head 32 of the bolt 30 is seated in the second notch 16, the shaft 31 of the bolt 30 is moved in the direction of arrow B in FIG. When turning in the opposite direction and moving to a state where the head 32 is seated in the first cutout portion 15, it also functions as a movement passage for the shaft portion 31.
[0026]
【how to use】
Next, a procedure for attaching a bolt 30 to the metal fitting 10 to form a blind bolt, and inserting the blind bolt into a through hole communicating with the closed space to attach a member (eg, a bracket) will be described with reference to FIGS. I do.
First, the shaft 31 of the bolt 30 is inserted into the bottom opening 18 of the main body 13 of the metal fitting 10 in the direction of the arrow A in FIG. 1, and is inserted until immediately before the head 32 of the bolt 30 enters the first cutout 15.
[0027]
Next, when the shaft portion 31 is turned in the direction of arrow B in FIG. 1, the bolt 30 is housed inside the main body 13 as shown in FIG. 3, and its head 32 is seated in the second cutout portion 16. . In the state of FIG. 3, the axial direction of the shaft portion 31 of the bolt 30 matches the longitudinal direction of the main body 13. The shaft 31 can be moved using the bottom opening 18 as described above during turning.
[0028]
Next, as shown in FIG. 4, the blind bolt 40 in the state shown in FIG. 3 is inserted into a through hole 51 provided in, for example, a wall 50 of the building from the surface side in the direction of arrow C. At that time, for example, the posture in which the bottom 11 of the main body 13 is on the lower side is maintained.
Then, when the metal fitting 10 is inserted into the through hole 51, the state shown in FIG.
This is because the gravity balance around the locking projection 14 is unbalanced, and the through hole side is heavier.
[0029]
At this time, the metal fitting 10 is supported by the pair of locking projections 14 with the outer periphery of the shaft part 31 of the bolt 30 being sandwiched, so that the metal fitting 10 rotates smoothly. In the present embodiment, since the second notch 16 is formed with the inclined notch 20 extending toward the locking projection 14, the second notch 16 is turned when the metal fitting 10 turns in the direction of arrow D. The head 32 of the bolt 30 can be more smoothly separated from the notch 16.
[0030]
Next, as shown in FIG. 5, when the shaft portion 31 of the bolt 30 is pulled toward the surface of the wall 50, the head portion 32 of the bolt 30 is seated on the first cutout 15. Then, the bracket 53 is attached to the wall 50 by inserting the shaft portion 31 into the bolt hole of the bracket 53 from the front side and fastening with the nut 54. In the present embodiment, since the rotation preventing means 17 a is formed in the insertion portion 17, the bolt 30 does not rotate together when fastening with the nut 54.
FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5, and specifically shows the rotation preventing means 17a.
[0031]
When the anti-rotation preventing means 17a is not formed, for example, the lower surface of the head 32 of the nut 30 is cut by the pulling of the shaft 31 of the bolt 30 toward the surface of the wall 50. The nut 54 is pressed against the incised bottom portion, and the nut 54 can be fastened while preventing co-rotation by utilizing the frictional force thereby.
In the embodiments described so far, the bolts 30 combined with the metal fittings 10 are described in which the shaft portion 31 and the head 32 are integrated. However, the bolts 30 that can be used in combination with the metal fittings 10 are not limited to this. The bolt 30 may be formed by screwing a nut to a rod-shaped member having an external thread portion.
[0032]
【The invention's effect】
As described above, the metal fitting for forming a blind bolt according to the present invention can freely select the length or material of the shaft portion of the blind bolt by combining with a general bolt. Therefore, an extremely wide range of blind bolt specifications can be covered only by preparing the metal fittings according to the present invention for each bolt diameter. In addition, since the bracket can be shared for each bolt diameter, the cost of the series of blind bolts can be reduced. Furthermore, since there is no conventional pin-supporting mechanism, a blind bolt having excellent pull-out resistance and shear resistance can be formed.
[0033]
In the metal fitting, an inclined notch may be formed on both sides of the second notch on the locking protrusion side. This facilitates pivoting of the bolt shaft, and as shown in FIG. 4, the metal fitting can be easily separated from the bolt in the closed space.
[0034]
Further, in any of the above-mentioned metal fittings, a means for preventing the head of the bolt from turning can be provided at the bottom adjacent to the first cutout 15. In this way, when the brine bolt inserted into the through hole is fastened with the nut, the co-rotation of the bolt can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a blind bolt is being formed by combining a bolt with a metal fitting according to the present invention.
FIG. 2 is a plan view of FIG. 1;
FIG. 3 is a front view showing a state in which a blind bolt is formed by combining a bolt with the fitting according to the present invention.
FIG. 4 is an explanatory view of a state where the brine bolt of FIG.
FIG. 5 is an explanatory view showing a state in which a bracket 53 is attached to a brine bolt inserted through a wall 50.
FIG. 6 is a view taken along the line VI-VI in FIG. 5;
FIG. 7 is a front view showing an example of a conventional blind bolt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Blind bolt 2 Shaft part 3 Pin 4 Hanger 5 Outer thread part 10 Hardware 11 Bottom part 12 Side part 13 Main body 14 Locking convex part 15 First cutout part 16 Second cutout part 17 Insertion part 17a Detent preventing means 18 Bottom opening 20 Inclined notch 30 Bolt 31 Shaft 32 Head 33 External thread 40 Blind bolt 50 Wall 51 Through hole 52 Closed space 53 Bracket 54 Nut

Claims (4)

It is attached to a bolt 30 having a shaft portion 31 and a head portion 32, and after inserting the bolt 30 from one surface of the bolt hole of the attached member, it rotates around the head portion 32 to rotate the attached member. Metal fittings 10 for forming a blind bolt to be in contact with the other surface of
An elongated body 13 having a bottom portion 11 and a pair of side portions 12 erected vertically from both ends in the width direction;
A first cutout portion 15 for seating the head, which is cut off at the longitudinally intermediate portion of the main body 13 at the bottom portion 11 and both side portions 12 continuous therewith;
A second notch 16 for seating the head, which is separated from the first notch 15 in the longitudinal direction and cut off at the bottom portion 11 and both side portions 12 continuous with the bottom portion 11;
A bottom opening 18 formed by cutting the bottom 11 between the first cut 15 and the second cut 16 so as to communicate with each other, and having their bottoms elongated in the longitudinal direction; With
A bolt shaft 31 is inserted into the bottom opening 18 from the outer surface side of the bottom 11 and its head 32 is seated horizontally on the second notch 16, and the whole is inserted into the bolt hole. After inserting,
The body 13 is rotated with respect to the shaft 31 of the bolt 30 so that its head 32 is seated vertically on the first cutout 15 for forming a blind bolt. Metal fittings. In claim 1,
A pair of locking projections 14 protrude inward at the side portions 12 adjacent to the first notch portion 15,
Blind bolt formation in which the shaft portion 31 of the bolt 30 is locked by the pair of locking protrusions 14 and the bolt 30 is relatively rotated with respect to the main body 13 about the locking protrusion 14 as a fulcrum. Metal fittings. 3. In order to facilitate turning of the shaft portion 31, the second cut portion 16 is cut off at both sides of the second cut portion 16 so as to extend toward the locking projection 14 and be inclined toward the bottom. A metal fitting for forming a blind bolt, wherein the inclined notch portion 20 is formed. The metal fitting for forming a blind bolt according to claim 2 or 3, wherein a rotation preventing means (17a) for preventing a head (32) of the bolt (30) from being formed is formed at a bottom portion adjacent to the first notch (15).

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