Patent ID: 9616485
Date: 2017-04-11
CPC Classifications: B21B,B21C,B21H,C22C,Y10T

Claim:
1. A metal strip, comprising: two longitudinal end portions, a longitudinal intermediate portion between the two longitudinal end portions, and two inclined portions connecting respective ones of the two longitudinal end portions to the longitudinal intermediate portion, each of the two longitudinal end portions having a thickness greater than a thickness of the longitudinal intermediate portion, each of the two inclined portions having a thickness that continuously and monotonically decreases from the respective one of the two longitudinal end portions to the longitudinal intermediate portion, the thickness of at least one of two longitudinal end portions continuously and monotonically decreases from an end surface thereof toward the inclined portion connected thereto, and a rate of change at which the thickness of the at least one of the two longitudinal end portions continuously and monotonically decreases along the longitudinal direction is smaller than a rate of change at which the thickness of the respective one of the two inclined portions decreases.