Diameter expansion drill bit
AssigneeFs Technical Corporation
InventorShogo Fujita
Life of this patent
Estimating the term…
Abstract
A diameter expansion drill bit used for inserting in a prepared hole perforated in a framework to expand a diameter of a portion of the prepared hole by grinding has a plurality of blade sections that grind the portion of the prepared hole, a blade holding section that holds the plurality of blade sections movably in a radial direction respectively, and a shank section that supports the blade holding section, and the plurality of blade sections move to spread outwardly in the radial direction with respect to the blade holding section by centrifugal force due to rotation.
Claims14
A diameter expansion drill bit used for inserting in an anchoring prepared hole perforated in a framework to expand a diameter of a portion of the prepared hole by grinding comprising:
- a plurality of blade sections being capable of grinding the portion of the prepared hole;
- a blade holding section that holds the plurality of blade sections so as to be slidingly movable in a radial direction respectively;
- and
- a shank section that supports the blade holding section,
- wherein the blade holding section has a steeple portion that positions to project at a tip portion of the blade holding section coaxially, and
- wherein the plurality of blade sections are capable of slidingly spreading outwardly in the radial direction with respect to the blade holding section by centrifugal force due to rotation.
Dependencies are inferred from the claim text.