The Kiev Institute of Technology has developed a safety coupling with high running accuracy, as shown in the figure. With the ring 3, a coil spring 4 wound in a cylindrical shape by a diameter D is fixed in the longitudinal groove of the inner half coupling 1. The outer half coupling 2 has a radial hole for fixing the small ball 9 to prevent the thin-walled cup 6 and the outer sleeve 8 which are freely mounted in the half coupling from falling off the small ball. coat
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