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Insight - How Expandable Screw Works

Written By: 

Bijal Parikh

Expandable Screw

 

These metal plates are called sleeves. Three sleeves are placed adjacent to one another. This part forms the outer structure and termed as outer screw. After arranging the sleeves in their position we get the structure as shown below.

Expandable Screw

We can clearly see a tubular structure is obtained and can easily be passed through eye hook screw. A hollow cup is used to keep the sleeves together.  

The cuts on the sleeves   have specific purpose from the design perspective. The cuts on the sleeves are made in such a way that each of the metal sleeves is smoothly positioned adjacent to each other.

But there is still a missing link in our design. There should be a part that will push these sleeves outward to expand. The conical nut in the assembly accomplishes this task.

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