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 engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
Neil Fromer is the executive director of the Resnick Institute, a program for energy and sustainability at the California Institute of Technology, working to develop new ideas and research technologies related to providing a sustainable future. He spoke to us about the severity of the current drought in California and how solar energy can help prevent such situations in the future.
From home enthusiasts to workers on the manufacturing floor, everyone's imagination is captured by the potential of 3D printing. Prototyping, spare parts creation, art delivery, human organ creation, and even mass product production are all being targeted as current and potential uses for the technology.
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.