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Richard

Richard

LILY Technical Team · 168 Articles

Richard is a senior engineer with 18 years of experience in the bearing industry, specializing in product quality supervision, inspection, and customer-oriented product evaluation. He excels at identifying and correcting quality anomalies during production, implementing effective on-site controls, corrective actions, and preventive measures to ensure products consistently meet high standards. With deep expertise in bearing product standardization, Richard is skilled at resolving technical issues related to materials, heat treatment, and machining processes — continuously optimizing product quality and production processes to deliver reliable technical support and solutions to clients.

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What Is a Constant Force Spring? Mechanics, Mounting, and Applications
7 min read

What Is a Constant Force Spring? Mechanics, Mounting, and Applications

Constant Force SpringsFlat SpringsspringsStrip Springs

A constant force spring is a coiled flat strip that keeps the same radius of curvature as it unwinds, producing a flat force curve over long travel unlike a round-wire extension spring governed by Hooke’s Law. Proper drum mounting is critical: the drum diameter should be 10–20% larger than the natural coil diameter, with at least 1.5 wraps remaining at full extension to prevent kinking, set loss, and reduced cycle life. Load is governed by strip material, width, thickness, and natural radius, with force scaling roughly with thickness cubed, while guided travel and correct end configurations help avoid buckling and fatigue issues. Common uses include counterbalances, cable and hose retractors, tool-head return systems, cabinet closers, fitness resistance mechanisms, and retail product dispensers where steady linear force is required.

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