Daicel Corporation

Naoki Nakatsuka

Masayuki Nakayasu

Masakazu Tokuda

The present invention provides a method for measuring connection strength of a measuring object in which a first measurement member and a second measurement member are connected,

Connection strength measurement method

A rolling-swaging tool for closing an opening of a cylindrical housing includes: a support shaft connected to a driving body; rotating shafts extending in directions orthogonal to the support shaft; and swaging portions, each of which being attached to each of the rotating shafts. The swaging portions have, an annular first swaging portion having a minimum thickness and a maximum outer diameter, a disk third swaging portion having a maximum thickness and a minimum outer diameter, and an annular second swaging portion having a thickness between the minimum thickness and the maximum thickness and an outer diameter between the maximum outer diameter and the minimum outer diameter. The tool also has a first annular inclined surface provided between the annular first swaging portion and the annular second swaging portion, and a second annular inclined surface provided between the annular second swaging portion and the disk third swaging portion.

Rolling-swaging tool and method for closing opening of cylindrical member using same

The present invention provides a closing structure which closes, with an igniter, an opening of a cylindrical housing used in a gas generator, the cylindrical housing provided with a stepped surface formed on an inner side of a circumferential wall on the side of the opening, and a distal end circumferential wall extending from the stepped surface to the opening, the igniter having an igniter main body, and an igniter collar surrounding part of the igniter main body and having an annular plate portion with a maximum outer diameter and a circumferential wall excluding the annular plate portion, the annular plate portion including, a first annular surface facing the ignition portion of the igniter main body, a second annular surface facing the electroconductive pin of the igniter main body, and an annular circumferential surface between the first annular surface and the second annular surface, a first annular circumferential edge at the boundary between the first annular surface and the annular circumferential surface, and a second annular circumferential edge at the boundary between the second annular surface and the annular circumferential surface, and the second annular circumferential edge provided with an inclined surface in three or more locations, and the first annular surface of the igniter collar being abutted against the stepped surface of the cylindrical housing, and the annular circumferential surface and the second annular circumferential edge of the igniter collar being abutted against the distal end circumferential wall.

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Tatsuno, Japan

Naoki Nakatsuka