The Theory and Design of Long-Deflection Constant-Force Spring Elements

A thorough study of the “neg’ator,” its present and predictable applications and design procedures are discussed in the light of two years’ experience in neg’ator development, research, and testing. The neg’ator is characterized by properties which permit it to exert constant or controlled varying force through theoretically infinite deflection. Design formulas and operation of the three major forms of the neg’ator, (1) extension member, (2) A-motor, and (3) B-motor, are discussed and illustrated. The major existing applications of the neg’ator are examined in terms of form, function, field, and type of mechanism and are illustrated by several representative designs.