JP2020183803A - Fastening device and fastening method - Google Patents

Abstract

To provide a fastening device which does not lower a fastening force of a nut with respect to a bolt, can surely prevent the forgetting of the fastening of the nut, is easy in manufacturing, and easy in fastening, and a fastening method.SOLUTION: In a fastening device in which an elastic ring 6 which can expand in a radial direction by compression is interposed between a fastened member 1 fastened to a bolt 3 and a nut 2 via a washer 4 and the washer 4, the fastening device is composed of a collar 5 having a lower end 5b directly abutting on the fastened member 1 and a tip 5a having a flange 51, and inserted into the bolt 3, and a cross-section rectangular elastic ring 6 having a thickness thicker than a height h of the collar 5 in an axial direction, and an outside diameter d4 which is equal to a flange diameter d2 of the flange 51 or smaller. The elastic ring 6 is formed while being enlarged in the radial direction so that, when the elastic ring 6 is compressed, the elastic ring 6 protrudes outside the flange diameter d2 of the flange 51.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fastening device capable of preventing forgetting to tighten a bolt and a nut without weakening the fastening force of the nut screwed to the bolt.

Conventionally, many methods have been proposed as in Patent Document 1 in which a visual recognition member is interposed between a washer to be attached to a nut and a member to be fastened to prevent forgetting to tighten. The visual recognition member in Patent Document 1 is arranged so that the outer peripheral edge of the washer is raised and the raised outer peripheral edge is in contact with the visual recognition member, and is outside when the visual recognition member is pinched. It is possible to make the outer peripheral edge of the visual recognition member project outward from the edge portion such as a washer that sandwiches the visual inspection member.

Japanese Unexamined Patent Publication No. 11-30216

The visual recognition member shown in Patent Document 1 is interposed between the fastened member and the washer, and spreads outward when the visual recognition member is pinched, but also spreads inward and the entire back surface of the washer. The back surface of the washer does not come into direct contact with the member to be fastened, and the fastening force of the nut is loosened by the elasticity of the visual member, so there is a problem that sufficient fastening force of the nut cannot be secured. There was a problem that it took time and effort to fasten the nuts.

The present invention has been made in consideration of the above, and it is possible to prevent the nut from being forgotten to be tightened without weakening the fastening force of the nut to the member to be fastened, and to fasten with the nut. It is an object of the present invention to provide a fastening device that can be easily manufactured with less processing to prevent forgetting to tighten while the work is carried out quickly.

In order to solve the above problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 is a fastening device in which an elastic ring that can be expanded in the radial direction by compression is interposed between a member to be fastened to a bolt and a nut via a washer and the washer.
A collar that has a lower end that comes into direct contact with the member to be fastened and a tip that is provided with a flange and is inserted into the bolt.
It comprises an elastic ring having a rectangular cross section having a thickness larger than the axial height of the collar and an outer diameter equal to or smaller than the flange diameter of the flange.
The elastic ring is a fastening device characterized in that when the elastic ring is compressed, the elastic ring expands in the radial direction so as to project outward from the outer peripheral edge of the flange.

The invention according to claim 2 is characterized in that the inner diameter of the elastic ring is made smaller than the outer diameter of the outer circumference of the collar, and the elastic ring is press-fitted into the collar while forcibly expanding the diameter. The fastening device according to the above.

The invention according to claim 3 is characterized in that a taper is formed on the outer periphery of the collar so as to be inclined outward in the radial direction toward the lower end to increase the contact area of the collar with the member to be fastened. The fastening device according to the above.

According to the fourth aspect of the present invention, the nut is attached to the bolt so that an elastic ring that can be expanded in the radial direction by compression is interposed between the member to be fastened to the bolt and the nut via a washer and the washer. It is a fastening method to screw in
A collar having a flange at the tip is inserted into the bolt, and the elastic ring having a rectangular cross section having an outer diameter equal to or less than the flange diameter of the flange is fitted on the outer periphery of the collar, and the thickness of the elastic ring is determined by the collar. The collar is inserted into the bolt, the nut is screwed in, the elastic ring is compressed and expanded in the radial direction, and the collar protrudes outward from the outer peripheral edge of the flange. It is a fastening method characterized by tightening with the nut until the lower end of the collar comes into direct contact with the member to be fastened.

With the above configuration, the present invention has the following effects.

The invention according to claim 1 is a fastening device in which an elastic ring that can be expanded in the radial direction by compression is interposed between a member to be fastened to a bolt and a nut via a washer and the washer.
A collar that has a lower end that comes into direct contact with the member to be fastened and a tip that is provided with a flange and is inserted into the bolt.
It comprises an elastic ring having a rectangular cross section having a thickness larger than the axial height of the collar and an outer diameter equal to or smaller than the flange diameter of the flange.
When the elastic ring is compressed, the elastic ring expands in the radial direction so that the elastic ring protrudes outward from the outer peripheral edge of the flange. Therefore, when the elastic ring is compressed, the elastic ring is expanded. The outer periphery of the flange protrudes outward from the outer peripheral edge of the flange, but does not protrude until the inner circumference of the elastic ring enters the contact surface of the lower end of the collar, and the fastening force acting on the member to be fastened is weakened. It is possible to exert a large fastening force uniformly and surely, prevent loosening due to insufficient fastening force, and easily confirm the completion of the fastening work of the bolt and nut to prevent forgetting to tighten.

In the invention according to claim 2, since the inner diameter of the elastic ring is made smaller than the outer diameter of the outer circumference of the collar and the elastic ring is press-fitted into the collar while forcibly expanding the diameter, the elastic ring is pressed into the collar. It will not come off more and will not be lost, and the elastic ring can be inserted into the bolt with the elastic ring attached to the collar in advance, and the nut can be fastened quickly.

In the invention according to claim 3, since a taper is formed on the outer periphery of the collar so as to be inclined outward in the radial direction toward the lower end to increase the contact area with the member to be fastened, the fastening force with respect to the member to be fastened is increased. At the same time, the elastic ring does not come off from the collar and is not lost, and when the elastic ring is compressed, the inner circumference of the elastic ring protrudes until it enters the contact surface of the lower end of the collar. There is no. Further, the outer peripheral taper of the collar can be easily manufactured by forming the collar with a draft of a forging mold.

In the invention according to claim 4, the nut is attached to the bolt so that an elastic ring that can be expanded in the radial direction by compression is interposed between the member to be fastened to the bolt and the nut via a washer and the washer. It is a fastening method to screw in
A collar having a flange at the tip is inserted into the bolt, and the elastic ring having a rectangular cross section having an outer diameter equal to or less than the flange diameter of the flange is fitted on the outer periphery of the collar, and the thickness of the elastic ring is determined by the collar. The collar is inserted into the bolt, the nut is screwed in, the elastic ring is compressed and expanded in the radial direction, and the collar protrudes outward from the outer peripheral edge of the flange. Since the lower end of the collar is tightened by the nut until it comes into direct contact with the member to be fastened, it is possible to easily confirm from the start to the completion of the tightening work of the nut to the bolt, prevent forgetting to tighten, and shorten the tightening work. The construction efficiency can be improved.

The cross-sectional view which shows the 1st Embodiment in this invention. The cross-sectional view which shows the tightening state in the 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2 of the present invention. Sectional drawing which shows the collar and elastic ring in this invention. The cross-sectional view which shows the tightening state in the 2nd Embodiment of this invention. FIG. 5 is a cross-sectional view showing a collar according to a second embodiment of the present invention. The perspective view which shows the elastic ring in the 2nd Embodiment of this invention.

Hereinafter, embodiments of the fastening device according to the present invention will be described. Embodiments of the present invention represent the most preferred embodiments of the invention, and the invention is not limited thereto.

The first embodiment of the present invention will be described with reference to FIGS. 1 and 4. FIG. 1 shows an example in which a fastening device is implemented. The member to be fastened is a member to be fastened, and the member to be fastened 1 is fastened by screwing a nut 2 to a bolt 3 via a washer 4. ..

A collar 5 having a flange 51 at the tip 5a is inserted into the bolt 3, the flange 51 has a flange diameter d ₂ equal to or larger than the outer peripheral edge of the washer 4, and the collar 5 is formed into the collar 5 by forging or the like. The flange 51 is integrally formed.

The elastic ring 6 made of a rubber material having a rectangular cross section having an outer diameter d ₄ having an outer diameter d ₂ or less of the flange diameter d ₂ of the flange 51 is fitted into the outer circumference 5c of the collar 5, and the inner diameter d _{3 of the} elastic ring 6 is fitted. is press-fitted into the collar 5 is smaller than the outside diameter d ₁ of the outer peripheral 5c, while forcibly expanded the elastic ring 6 of the collar 5. As a result, the elastic ring 6 does not come off from the collar 5 and is not lost, and the collar 5 can be easily inserted into the bolt 3 so that the nut 2 can be fastened quickly. Reference numeral 5d is a bolt insertion hole formed in the collar 6.

When the thickness t of the elastic ring 6 is made larger than the axial height h of the collar 5, the collar 5 is inserted into the bolt 3 and the nut 2 is screwed in, the elastic ring 6 is compressed and the elasticity is increased. The outer circumference 6a of the ring 6 is expanded in the radial direction so as to protrude beyond the outer peripheral edge of the flange 51, and the nut 2 is screwed into the bolt 3 until the lower end 5b of the collar 5 directly abuts on the member 1 to be fastened. ..

The flange diameter d ₂ of the flange 51 is set to a diameter equal to or larger than the outer peripheral edge of the washer 4, a plurality of viewing windows 51a are provided in the flange 51, and the nut 2 is screwed onto the bolt 3 through the viewing window 51a. At the time of fitting, it can be confirmed from above that the elastic ring 6 is attached to the collar 5.

When the elastic ring 6 has a color different from that of the washer 4, it can be surely confirmed that the elastic ring 6 is attached to the collar 5 and whether or not the fastening state by the nut 3 is completed.

In this embodiment, even if the elastic ring 6 is interposed, the lower end 5b of the collar 6 is in direct contact with the tightened member 1, and the fastening force by the nut is not weakened, and the nut is loosened. In addition, when the nut 2 is fastened, the outer peripheral 6a of the elastic ring 6 protrudes beyond the outer peripheral edge of the flange 51 of the collar 5, and the work of fastening the nut 2 to the bolt 3 is completed. You can easily check and prevent forgetting to tighten. Further, the collar 5 having the flange 51 at the tip 5a of the bolt 3 can be easily manufactured, and the elastic ring 12 can be easily attached to the collar 5.

Next, a second embodiment will be described with reference to FIGS. 5 and 7. In this embodiment, the same configuration as that in the first embodiment will be described with the same reference numerals.

In this second embodiment, the fastened member 1 described in the first embodiment is assembled by screwing the nut 2 onto the bolt 3 via the washer 4.

In this embodiment, as shown in FIGS. 5 and 7, a collar 10 made by forging is inserted into the bolt 3, the collar 10 is provided with a small diameter tip 10a, and the small diameter tip 10a is connected to the washer 4. The large-diameter flange 11 is fitted and integrated with the collar 10. Reference numeral 10e is a bolt insertion hole.

The outer circumference 10c of the collar 10 forms a taper 10d that inclines outward toward the lower end 10b, thereby increasing the contact area of the lower end 10b of the collar 10 with the member to be fastened 1. The taper 10d may be a draft of the mold in the forging process.

An elastic ring 12 having a rectangular cross section having an outer diameter d ₄ having a flange diameter d ₂ or less of the flange 11 is fitted into the outer circumference 10 c of the collar 10, and the thickness t of the elastic ring 12 is set in the axial direction of the collar 10. It becomes larger than the height h.

The elastic ring 12 is provided with a notch 12c, and even if the elastic ring 12 has the taper 10d that makes it difficult for the elastic ring 12 to come off from the outer circumference 10c of the collar 10, the elastic ring 12 is made of the collar 10 by the notch 12c. It becomes easy to fit into the outer circumference 10c.

The collar 10 is inserted into the bolt 3 and the nut 2 is screwed in, the elastic ring 6 expands in the radial direction while being compressed and protrudes beyond the outer peripheral edge of the flange 11, and further, the lower end 10b of the collar 10 Is tightened by the nut 2 until it comes into direct contact with the member to be fastened 1.

Moreover, since the outer circumference 10c of the collar 10 has the taper 10d, when the elastic ring 12 is compressed, the outer circumference 12a of the elastic ring 12 projects outward from the outer peripheral edge of the flange 11. The inner circumference 12b of the elastic ring 12 does not protrude until it enters the contact surface of the lower end 10b of the collar 10.

In this embodiment, it is possible to reliably prevent forgetting to tighten the fastening member 1 without weakening the fastening force of the nut 2, and the collar 10 is easy to manufacture, and the elasticity with respect to the collar 10 is easy. The ring 12 can be easily attached.

In the fastening device having the above configuration, the collars 5 and 10 having flanges 51 and 11 at the tips of the bolts 3 are inserted into the bolts 3 and the outer circumferences 5c and 10c of the collars 5 and 10 are inserted. The elastic rings 6 and 12 having a rectangular cross section and having an outer diameter d ₄ having a flange diameter d ₂ or less of the flanges 51 and 11 are fitted therein, and the thickness t of the elastic rings 6 and 12 is set to the collars 5 and 10. The height h in the axial direction is made larger than the height h in the axial direction, the collars 5 and 10 are inserted into the bolt 3, the nut 2 is screwed in, and the elastic rings 6 and 12 expand in the radial direction while being compressed, and the flange 51 Since it protrudes beyond the outer peripheral edge of the bolt 3, the completion of the fastening work of the nut 2 to the bolt 3 can be easily confirmed and forgetting to tighten can be prevented.

Further, the lower ends 5b and 10b of the collars 5 and 10 are tightened by the nut 2 until they come into direct contact with the member to be fastened 1, and the fastening force acting on the member to be fastened 1 is not weakened, and a large fastening force is obtained. Can be exhibited uniformly and reliably, and loosening due to insufficient fastening force can be prevented.

Further, the inner diameter d ₃ of the elastic rings 6 and 12 is made smaller than the outer diameter of the outer circumference 5c of the collars 5 and 10, and the elastic rings 6 and 12 are press-fitted into the collars 5 and 10 while forcibly expanding the diameter. As a result, the elastic rings 6 and 12 do not come off from the collars 5 and 11 and are not lost, and the elastic rings 6 and 12 are inserted into the bolt 3 with the elastic rings 6 and 12 attached to the collars 5 and 10 in advance. The nut 2 can be fastened quickly.

The present invention is a fastening device capable of confirming forgetting to tighten a nut to a bolt and securely fastening the nut without lowering the fastening force.

1 Member to be fastened 2 Nut 3 Bolt 4 Washer 5 Collar 5a Tip 5b Lower end 5c Outer circumference 5d Bolt insertion hole 51 Flange 51a Peephole 6 Elastic ring 6a Outer circumference 6b Inner circumference 10 Collar 10a Small diameter tip 10b Lower end 10c Outer circumference 10d Tapered 10e Bolt insertion hole 11 Flange 12 Elastic ring 12a Outer circumference 12b Inner circumference 12c Notch d ₁ Outer diameter d ₂ Flange diameter h Height d ₃ Inner diameter d ₄ Outer diameter t Thickness

Claims (4)

A fastening device in which an elastic ring that can be expanded in the radial direction by compression is interposed between a member to be fastened to a bolt and a nut via a washer and the washer.
A collar that has a lower end that comes into direct contact with the member to be fastened and a tip that is provided with a flange and is inserted into the bolt.
It comprises an elastic ring having a rectangular cross section having a thickness larger than the axial height of the collar and an outer diameter equal to or smaller than the flange diameter of the flange.
The elastic ring is a fastening device characterized in that when the elastic ring is compressed, the elastic ring expands in the radial direction so as to project outward from the outer peripheral edge of the flange. The fastening device according to claim 1, wherein the inner diameter of the elastic ring is made smaller than the outer diameter of the outer circumference of the collar, and the elastic ring is press-fitted into the collar while forcibly expanding the diameter. The fastening device according to claim 1, wherein a taper is formed on the outer periphery of the collar so as to be inclined outward in the radial direction from the tip to the lower end to increase the contact area with the member to be fastened. A fastening method in which the nut is screwed into the bolt so that an elastic ring that can be expanded in the radial direction by compression is interposed between the member to be fastened to the bolt and the nut via a washer and the washer.
A collar having a flange at the tip is inserted into the bolt, and the elastic ring having a rectangular cross section having an outer diameter equal to or less than the flange diameter of the flange is fitted on the outer periphery of the collar, and the thickness of the elastic ring is determined by the collar. The collar is inserted into the bolt, the nut is screwed in, the elastic ring is expanded in the radial direction while being compressed, and the collar protrudes outward from the outer peripheral edge of the flange. A fastening method characterized by tightening with the nut until the lower end of the collar comes into direct contact with the member to be fastened.

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