Constant-force spring
Spiroflex
The original concept of constant force springs was Extension Springs for counterbalancing windows For many years this has been a perfect aid in the opening and closing of windows from residential applications to black taxi cabs through to Rolls Royce and Aston Martin cars.
Constant force extension springs provide a huge range of application opportunities. Springs can be can be mounted on a bobbin or bush or free running in a cavity or recess. Springs can be joined or laminated to provide increased force with minimal increases in space requirements.
