Vulcan Spring - Constant Force Spring, Pullbox, Constant Torque Spring, etc. SiteMap Constant Force Spring Constant Torque Spring Variable Force Spring Motor Brush/Twin Spring Pullbox Power Spring Spring Solutions for the Global Marketplace With decades of experience in meeting the needs of designers and engineers, Vulcan Spring is uniquely equipped to provide custom spring solutions to industrial and point-of-purchase application challenges. We custom manufacture to exact specifications and often partner with designers and engineers to integrally design a spring into the application for seaml