John Evans’ Sons LLC

John Evans’ Sons, Incorporated, is an international leader in spring design & production with proven expertise in precision, utilizing advanced design & manufacturing technology. Founded in 1850, John Evans’ proudly stands as America’s Oldest Springmaker.

We offer several counterbalance options to assist/enhance articulated instruments & assemblies. Many medical equipment designers utilize constant force springs, constant force spring motors, spiral torsion springs, power springs, and more. We are proud to manufacture custom medical springs and components that meet the highest standards for medical device manufacturers.

Our custom design and precision manufacturing capability are supported by a complete machine shop staffed by a professional crew of toolmakers who utilize Dessault Systemes Solid Works for design, and Charmilles EDMs for tool and die production. This allows us to build, maintain, and repair all tools utilized in our production areas. We design and build many of our own high speed, automated, spring manufacturing machines. This “on-site” capability further reduces cost and lead time for our customers.

Major aerospace and defense corporations have recognized our quality manufacturing. Kaman Aerospace has presented our company with its top award for outstanding quality and on-time delivery by a component vendor to a major defense contractor.

Some of our most notable projects include:

Airborne FLIR camera mounting
Sub-launch Tomahawk cruise missile
Aircraft door counterbalance mechanisms
Suspension components for the Mars rover Curiosity

With respect to motion control applications, we offer several counterbalance options to assist/enhance articulated instruments and assemblies. Many aerospace equipment designers utilize constant force springs, constant force spring motors, spiral torsion springs or spring reels. The capabilities of these products have significant benefits compared with traditional helical springs and gas springs.