Yorozu Corporation

Yutaka Kuroi

Masaharu Ishizuki

Shingo Yokoyama

Masaki Ueno

Hironori Ito

[Object] Damage to a surface of a resin bush caused by press-fitting is prevented even when a configuration for positioning during welding is added. [Solving Means] A rolled collar () is a steel rolled collar into which a resin bush () is pressed-fitted, and which is joined to a joining member by welding. The rolled collar includes a main body part () formed in a hollow cylindrical shape, and a clinch part that joins both end surfaces of the main body part together by fitting. The rolled collar includes a notch part () formed by cutting off a portion of an annular edge () in the main body part. Here, a convex jig determining a position of the main body part at a time of welding is fit into the notch part. The rolled collar includes a cavity part () formed to be hollow from an inner circumferential surface side on a wall surface around the notch part to form a clearance () between the press-fitted resin bush and an edge portion () of the notch part on the inner circumferential surface side.

Rolled collar, rolled collar manufacturing apparatus, and rolled collar manufacturing method

[Problem] To provide a hollow operating lever that is easily manufactured with good operability. [Solution] A hollow operating lever (), which is formed in such a manner that end portions (Wand W) of a flat plate-shaped workpiece (W) are joined to each other at a joint () and thus is rotatably provided with respect to a support shaft (), is characterized by including: a first wall () that is an operation surface side on which rotational force (F) acts to rotate; a pair of second walls () that are provided with coaxial holes () through which the support shaft is inserted, and are bent continuously to both ends of the first wall; and a third wall () that is provided to face the first wall () and is configured to connect the pair of second walls to each other through the joint.

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Yokohama, Japan

Yutaka Kuroi