A quarter-turn screw typically uses a spring feature to keep it in place when it is in a locked position. The attached components are firmly held in place, but under spring load, they can still move and are susceptible to loosening under vibration. In sealing applications, spring-loaded designs can be a problem because they don't provide a very tight joint.
This quick-insertion, quarter-turn screw clamps as well as a standard threaded screw.
This D-shaped threaded screw inserts and is held captive in a round clearance hole. The mating part uses a D-shaped hole to create a quick-insertion-type screw that, when rotated a quarter turn, engages the straight section of the D hole to provide a clamping force.
Bernie Leibman, Xerox Corp.,800 Phillips Rd., M.S. 111-06J, Webster, NY 14580; Tel: (716) 422-1294; Fax: (716) 422-3321; E-mail: Bernie.leibman@ usa.xerox.com.
The promise of the Internet of Things (IoT) is that devices, gadgets, and appliances we use every day will be able to communicate with one another. This potential is not limited to household items or smartphones, but also things we find in our yard and garden, as evidenced by a recent challenge from the element14 design community.
If you didn't realize that PowerPoint presentations are inherently hilarious, you have to see Don McMillan take one apart. McMillan -- aka the Technically Funny Comic -- worked for 10 years as an engineer before he switched to stand-up comedy.
The first Tacoma Narrows Bridge was a Washington State suspension bridge that opened in 1940 and spanned the Tacoma Narrows strait of Puget Sound between Tacoma and the Kitsap Peninsula. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7, just four months after it opened.
Noting that we now live in an era of “confusion and ill-conceived stuff,” Ammunition design studio founder Robert Brunner, speaking at Gigaom Roadmap, said that by adding connectivity to everything and its mother, we aren't necessarily doing ourselves any favors, with many ‘things’ just fine in their unconnected state.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.