Hub for a rotatable tool

E - Fixed Constructions – 04 – F

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51/145

E04F 21/16 (2006.01) A61C 3/06 (2006.01)

Patent

CA 1260274

- 11 - ABSTRACT A central hub for a rotatable tool which can be easily a) mounted on a polygonal seat at one end of a rotatable mandrel for rotation of the tool with the mandrel and b) subsequently removed with the tool from the seat of the mandrel. A central opening extending through the hub has a complex shape which includes a plurality of corners and a plurality of concave arcuate lines connecting the corners. The hub can be formed from a ductile preform having a generally cylindrical central opening extending through it by forcing, through the cylindrical opening in the preform, a polygonal punch having, in cross-section, substan- tially the same shape as, and a slightly larger size than, the polygonal cross-section of the seat of the mandrel which is to be inserted in the central opening in the hub of the tool.

508032

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