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Case Studies in Material Selection and Substitution
Published in Mahmoud M. Farag, Materials and Process Selection for Engineering Design, 2020
A turnbuckle is a loop with opposite internal threads in each end for the threaded end of two ringbolts, forming a coupling that can be turned to tighten or loosen the tension in the members attached to the ringbolts. Figure 11.1 shows an assembly of a typical turnbuckle. The turnbuckle is used in different applications involving widely different requirements of forces, reliability, and service conditions. Examples include guy wires for telegraph poles, ship rigs, sports equipment, and camping gear. The main functional requirements of a turnbuckle are to apply and maintain tensile forces to the members attached to the ringbolts. It should be possible for an operator to release and reapply the tensile forces when needed.
Power Cylinders and Control Drives
Published in Douglas O. J. deSá, Instrumentation Fundamentals for Process Control, 2019
Sizing of a control drive requires the following to be available or known: The force to actuate the control element.The angular distance through which the control element is to be moved.The separation distance between the drive and the control element. This is the center-to-center distance between levers. The linkage between the two levers is usually made adjustable, by including a turnbuckle.
Lead the folding motion of the thick origami model under gravity
Published in Journal of Asian Architecture and Building Engineering, 2023
Tianhao Zhang, Ken’Ichi Kawaguchi
The folding process is planned to be actuated by the driving system as illustrated in Figure 3. The steel ramen frame made with L-shaped cross-section is fixed on the ground. Between the two columns of the frame, a white acrylic plate is set as the base to reduce the contact friction between the ground and model. Four suspension cables are connected to the panels through connection joints that are anchored to the panels. On each suspension cable, a turnbuckle is equipped to adjust their lengths separately. The other ends of the suspension cables are joined to the active cable. The active cable runs through the two rope guides that are fixed on the beam of the frame. Therefore, the four suspension cables are synchronized by pulling the active cable. Simultaneously, the origami model is expected to fold as in Figure 4.