When evaluating your medical or dental equipment design, John Evans’ Sons offers several counterbalance options to assist and/or enhance articulated instruments.
Whether your design requires a counterbalance utilizing...
• Constant force springs
• Constant force spring motors
• Spiral torsion springs
• Spring reels
...the capabilities have significant benefits compared with traditional helical springs and gas springs:
Constant force springs provide a smooth range of motion and a constant load in either extending or retracting direction. This spring design has no inertia to overcome when considering the initial position starting forces. Constant force springs are compact and mount easily to existing hardware. Applications include counterbalancing of computer monitors in fixed and mobile applications, dental x-ray equipment articulated arms, as well as medical equipment drawer closing mechanisms.
Constant force springs, constant force spring motors and spiral torsion springs provide rotational energy to move or turn components in medical devices. Springs can eliminate costly and complicated motors decreasing your device size and cost.
Spiral torsion springs allow for rotation in 2 directions and a "return to center" capability. Used in pairs at right angle to each other, a wide range of motion can be achieved in two axis configuration, while preserving the "return to center" feature. An example application of this is a dental x-ray head unit.
Spring powered reels (arbor and base mounted) are available with a large range of forces, cable lengths, and travel. Spring powered reels mount easily, and with a pre-installed cables, attach quickly .
John Evans' has a fully staffed Engineering department that is eager to discuss your design requirements and counterbalance challenges in your design and prototype phase. In fact, many choices of counterbalances springs/reels are stock items and can ship quickly to aid in your product evaluation.