The Automated Doggie Door uses an inexpensive gearmotor to lift the door’s sliding panel but replaced the cable that typically would pull a load with a constant-tension spring, a patent-pending ...

Here are some issues engineers need to consider in the design phase to help guide spring selection.

This innovative design uses optical non-linear effects from the Kerr effect in the Fabry-Perot cavity to achieve high signal amplification ratios and optical spring constant, with potential ...