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 design ...

Spring are mechanical devices that store and apply kinetic energy. They’ve been around a long time and continue to play essential roles in a wide range of machines, vehicles, and engineering tools.

Variable rate coil springs will improve the overall ride of light vehicles. A new computer program, developed by Chevrolet to simulate the operational characteristics of tapered wire and/or ...