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Expansion bolts / Expansion bolts

Expansion bolts

Inflatable screw bolts are widly used in our life, but the disadvantage is it can not be used again, which causes huge waste of resourses and money.
So we reformed the screw bolts, we add a cycle of spiral burr on the periphery of the Inflatable screw bolts, a tubular spanner with spiral burr s in their inner wall is added too. When you have to take out the Inflatable screw bolts inserted in the wall, you just need to twist the tubular spanner to force it changing to the prototype .Then you can easily take it out.

University

Nanchang University

Nanchang University
China's jiangxi province nanchang red valley beach district 999 university avenue, China

Design

Nanchang University

Nanchang University
China's jiangxi province nanchang red valley beach district 999 university avenue, China