JPH1113723A - Structure for rivet fastening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably reduce the dislocating quantity between members to be fastened to each other when joint of members, structures, and the like are performed by rivets, by forming the diameter of a hole for rivet fastening of a fastened member on the caulked side larger than a hole for rivet fastening of a fastened member on the flange side. SOLUTION: As for hole diameters of a flange side fastened member 2 and a caulked side fastened member constituting a structure for rivet fastening, the hole diameter on the caulked side is formed into a larger diameter. A caulked side mandrel 12 fixes a flange 11 so as to press it to the flange side fastened member 2 and pulls a mandrel 9 in the right direction so as to withdraw, hence a blind rivet 1 is largely swelled in diameter so as to form a swelled diameter part 13, while moving to the flange side, and when the mandrel 9 is defeated by pulling force, the mandrel 9 is fractured so as to complete fastening. At this time, the swelled diameter wall 14 of the swelled diameter part 13 formed at pulling bites in the gap of the caulked side fastened member 3 so as to form a nearly blockaded state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a blind rivet fastening structure.

[0002]

2. Description of the Related Art In addition to welding and screwing, rivets are used for joining members, structures and the like. In addition, welding and screwing are often used for joining the main body structures and unit structures of office machines such as copiers, facsimiles, printers, personal computers, and office computers.

Conventionally, a fastening portion of a structure by blind rivet fastening is a blind rivet 1 comprising a flange 11 and a caulking side mandrel 12, as shown in FIG.
And a flange-side fastened member 5 and a caulking-side fastened member 6. The flange-side fastened portion 13 'generated on the swaged-side flange by the movement of the mandrel head at the time of fastening (at the time of swaging). The fastening member 5 and the member to be tightened 6 are fastened.

[0004]

However, the fastening portion of the structure by the conventional blind rivet fastening includes:
A gap 7 between the flange 11 and the flange-side fastened member 5,
7 when the shearing force is applied to the flange side member 5 and the caulking side member 6 in the directions of arrows A and B. Was. In addition, this causes a problem that the use range of the blind rivet fastening is limited to fastening of light-load members and structures.

[0005] The reason for the above-mentioned gap 7 is as follows.
In order not to impair the workability when inserting the blind rivet 1 from the flange side, an error in the assembly hole position between the members to be fastened is absorbed, and the blind rivet 1 is inserted into the hole on the caulking side.
As shown in FIG. 5, when the diameter of the hole of the flange-side fastened member 5 is D3 and the diameter of the hole of the squeezed-side fastened member 6 is D4, as shown in FIG. Point.

Here, as a feature of the blind rivet, the clinching mandrel 12 shown in FIG. 4 is fixed so that the flange 11 is pressed against the flange-side member 5 so that the mandrel 9 is moved in the direction of arrow C in FIG. When pulled so as to pull out, the diameter increases while moving to the flange side, and when the mandrel 9 loses the pulling force in the direction of arrow C, the mandrel 9 breaks to form a fastening.

As a result, the gap 7 on the flange side is left as it is after the caulking, and the flange-side fastened member 5
When a shearing force is applied to the fastening member 6 in the directions of arrows A and B, the gap 7 is displaced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and problems, and has as its object to provide a rivet fastening structure in which the amount of displacement between members to be fastened is significantly reduced as compared with the conventional structure.

[0009]

In order to achieve the above object, a rivet fastening structure according to the present invention has a rivet fastening hole for a caulking-side fastening member having a diameter for rivet fastening of a flange-side fastening member. It is characterized by being formed larger than the diameter of the hole. The caulking-side fastened member and the flange-side fastened member are members made of a metal material, members made of a resin material, or one of the members made of a metal material and the other made of a resin material. It can be composed of members.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a main part of a rivet fastening structure of the present invention. In the present invention, a hole diameter of a flange-side fastened member 2 and a caulking-side fastened member fastened member 3 constituting the rivet fastening structure. The diameter of the hole on the caulking side is set to be large so that the magnitude relationship between D1 and D2 is D1 <D2.

As shown in FIG. 2, the caulking-side mandrel 12 is fixed so that the flange 11 is pressed against the flange-side fastened member 2 and the mandrel 9 is pulled out in the direction of arrow C in FIG. When the mandrel 9 loses the tensile force in the direction of the arrow C, the mandrel 9 breaks to complete the fastening when the mandrel 9 loses the tensile force in the direction of arrow C while moving toward the flange side.

In this case, since the hole diameter D2 of the fastening member 3 on the caulking side is larger than the hole diameter D1 of the fastening member 2 on the flange side, as shown in FIG.
The bulged portion 14 bites into the gap 4 of the caulking-side fastened member 3 shown in FIG. 2, and the gap 4 before caulking is drastically reduced to form a substantially closed state.

As described above, conventionally, in order to prevent the workability when the blind rivet 1 is inserted from the flange side, the positional accuracy of the assembling holes between the members to be fastened is absorbed so as not to impair the workability. As shown in FIG. 5, when the diameter of the hole of the flange-side fastened member 5 is D3 and the diameter of the hole of the caulking-side fastened member 6 is D4 so that the blind rivet 1 can be inserted into the hole, D3> Although it was arranged as D4, according to the implementation results, according to the present invention, even when the hole diameter D2 of the caulking-side fastened member 3> the hole diameter D1 of the flange-side fastened member 2 when the blind rivet is inserted, as shown in FIG. It has been confirmed that workability hardly changes.

In the present invention, the members to be fastened 2 and 3 are not limited to metal-made materials such as sheet metal, but may be materials other than metal, for example, synthetic resin materials or a metal material and a synthetic resin material.

As described above, since there is almost no gap between the rivet after the rivet is fastened and the hole of the member to be fastened, the gap between the members to be fastened is suppressed even when a force in the direction of the force is applied to the member to be fastened. Therefore, the use range of the rivet fastening is not limited to the fastening of the member or the structure of the light load, and can be used, for example, for fastening the main body structure of the office equipment.

[0016]

As described above, according to the structure of the present invention, the gap between the rivet after the rivet is fastened and the hole of the member to be fastened can be removed, so that a force in the axial direction is applied to the member to be fastened. In this case, the displacement of the members to be fastened can be suppressed as much as possible, and the range of use of the rivet fastening is not limited to the fastening of lightly-loaded members and structures, for example, a structure constituting a main body of an office machine or the like. In addition, it is possible to change the joining method of the structure, which has been conventionally performed by welding or screwing, to rivet fastening, so that a significant cost reduction can be achieved.

Further, as the non-fastening member, a material other than metal,
For example, since synthetic resin materials can be used, or a metal material and a synthetic resin material can be used, it is possible to replace a structure portion conventionally welded using a metal material with a synthetic resin material. Load and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of a rivet fastening structure according to the present invention.

FIG. 2 is a cross-sectional view showing a state of a fastening portion of the structure before the blind rivet is fastened according to the present invention.

FIG. 3 is a cross-sectional view showing a state of a fastening portion of the structure by blind rivet fastening of the present invention.

FIG. 4 is a cross-sectional view showing a state of a fastening portion of a structure by conventional blind rivet fastening.

FIG. 5 is an explanatory diagram of a diameter of a fastening hole provided in a conventional blind rivet fastening member.

FIG. 6 is a cross-sectional view illustrating a state of a fastening portion of a conventional structure before fastening a blind rivet.

[Explanation of symbols]

 2,5 Flange side fastening member 3,6 Clamping side fastening member D1, D3 Diameter of fastening hole of caulking side fastening member D2, D4 Diameter of fastening hole of flange side fastening member

Claims (2)

[Claims] 1. A rivet fastening structure, wherein a diameter of a rivet fastening hole of a caulking-side fastened member is formed larger than a diameter of a rivet fastening hole of a flange-side fastened member. 2. The caulking-side fastened member and the flange-side fastened member are members made of a metal material, members made of a resin material, or one of a member made of a metal material and the other one made of a resin. The rivet fastening structure according to claim 1, wherein the rivet fastening structure is made of a material member.