Patent ID: 8746763

Claim:
A multistage energy absorber device comprising: a first generally tubular member having a first end and a second end; a second generally tubular member independent of the first generally tubular member and fitting within the first generally tubular member, the second generally tubular member having a first end and a second end; wherein the first ends of the first and second generally tubular members are substantially flush with each other; wherein the second end of the second generally tubular member protrudes sufficiently beyond the second end of the first generally tubular member to form a first deformation stage; wherein the first generally tubular member and the second generally tubular member extend coextensively sufficiently from the first ends of the first and second generally tubular members to the second end of the first generally tubular member to form a second deformation stage; and wherein the second end of the first generally tubular member is spot welded to the second generally tubular member.