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.
At the Design News webinar on June 27, learn all about aluminum extrusion: designing the right shape so it costs the least, is simplest to manufacture, and best fits the application's structural requirements.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This radio show will show what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.