To reduce friction resistance when a recessed-shape blade part is removed from a protruded portion.
This connecting device/method is provided with a cutting knife shape 2 having a protruded-shape blade part 1, and a recessed blade shape 4 with the recessed-shape blade part 3 opened in its tip to be engaged with the protruded-shape blade part 1. In the protruded-shape blade part 1 and the recessed-shape blade part 3, a gap value G2 between the protruded-shape blade part 1 and the recessed-shape blade part 3 in an inside after passing an inlet of the recessed-shape blade part 3 gets larger than a gap value G1 between the protruded-shape blade part 1 and the recessed-shape blade part 3 in the inlet, in both side faces in a side cut by those blade parts under the condition where they are engaged each other.
UENO SEIICHI
SAKATA KAZUMASA
KAMIMURA MASARU
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