Ricoh Company, Ltd.

Ryosuke Yoshikawa

Yuichi Jibiki

Mitsuru Yasuda

An attachment construction includes an attachment member in which a body of a blind rivet is integral with a head of the blind rivet. The body of the blind rivet is inserted into a fastening hole formed in a base material. The head of the blind rivet is placed in contact with a peripheral edge of the fastening hole of the base material. A boundary region exists between the body of the blind rivet and the head of the blind rivet and the boundary region has a cylindrical shape substantially parallel to the outer peripheral surface of the body of the blind rivet. The boundary region is mounted on a blind rivet fastening device for fastening the blind rivet to the base material. The blind rivet has a diameter smaller than a diameter of the fastening hole in the base material for ease of dismounting the blind rivet from the base material using a dismounting device. The attachment member comprises: a hollow body cover having an opening on a first end in an axial direction of the body of the blind rivet; a hollow cutting blade provided on the dismounting device, the hollow cutting blade having a knife edge with a outside diameter smaller than a diameter of the fastening hole formed in the base material, the knife edge having a diameter smaller than an outside diameter of the body of the blind rivet, and the hollow cutting blade having an opening in the axial direction of the body of the blind rivet in a first end thereof and a through-hole in an end wall in a second opposed end thereof; a pulling shaft provided with a shaft portion and an engaging portion, the shaft portion having a diameter which is smaller than a diameter of the through-hole in the second opposed end of the hollow cutting blade, the shaft portion being gripped by the blind rivet fastening device, and the engaging portion being in engagement with a back of a dismounting device body of the dismounting device; and an elastic member provided between the hollow body cover and the dismounting device body, wherein a rupture part is provided in the shaft portion of the pulling shaft.

Attachment construction of fastening member

The dismounting device includes, in order that a fastening member is dismounted from a base material, the fastening member comprising a head and a body, the body being inserted into a fastening hole formed in a base material, the head contacting a peripheral edge of the fastening hole into a fastened state with the body, a cutting member for cutting a boundary region between the head and the body from the head toward the body to separate the head from the body, the cutting member removing the fastening member from the base material.

Production system using the dismounting method for fastening member

Dismounting method for fastening member, dismounting device for fastening member, attachment construction of fastening member and production system using the dismounting method for fastening member

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Tokyo, Japan

Ryosuke Yoshikawa