Patent ID: 7005781

Claim:
A construction consisting of (a) a first bender of a predetermined length with a predetermined curvature, with a first end and a second end, of which the first end is rigidly clamped and the second end is free to move, whereas connected laterally to the second end of the first bender is (b) a second bender with a length equal to substantially twice the length of the first bender whereas its curvature is the opposite of that of the first bender, this second bender having a first and second end, where the first end of the second bender is rigidly attached to said second end of said first bender while said second end of said second bender is free to move, whereas connected laterally to the second end of the second bender is (c) a third bender with a length, substantially equal to the same predetermined length as said first bender while it has the same curvature as the first bender, said third bender having a first end and a second end, while said first end of said third bender is rigidly attached to said second end of said second bender, and said second end of said third bender is free to move.