Expandable insert for belling plastic tubes 1

This is a suggestion for the expandable insert used in belling machine: https://www.seevid.ir/fa/w/82m7Tf0p3gU to create an annular groove on heat-softened end of a tube. The insert ring consists of orange and blue inserts. Each insert belongs to a parallelogram mechanism, the base of which (yellow or green sliders) can move axially. Springs that tend to turn violet bars forwards are not shown. When the sliders move backwards, the inserts move inwards under the spring action. When the sliders move forw

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• #gear
• #mechanism