Drill Bit and Production Method
AssigneeHilti Aktiengesellschaft
InventorsGuenter DOMANI, Carsten PETERS, Florian SCHROEDER
Life of this patent
Estimating the term…
Abstract
A drill bit has, along a drill bit axis, a drilling head, a multi-start helix made of two or more helical coils, and an insertion end. The helix has a helix slope and a pitch in a delivery region. In an outlet region of the helix, the outlet region being directed towards the insertion end, the helical coils merge continuously, within a first portion, from an orientation in alignment with the helix slope into an orientation parallel to the drill bit axis. A length of the first portion is at least one quarter of the pitch of the delivery region. The helical coils, in a second portion, are oriented parallel to the drill bit axis.
Claims13
-12. (canceled)
A drill bit, comprising:
- a drilling head, a helix made of two or more helical coils, and an insertion end disposed along a drill bit axis, wherein the helix, in a delivery region, has a slope and a pitch;
- wherein in an outlet region of the helix, the outlet region is directed toward the insertion end and the two or more helical coils merge continuously, within a first portion of the outlet region, from an orientation in alignment with the slope into an orientation parallel to the drill bit axis;
- wherein a length of the first portion is at least one quarter of the pitch;
- wherein the two or more helical coils are, in a second portion of the outlet region, oriented parallel to the drill-bit axis.
A production method for a drill bit with a helix and an insertion end, comprising the steps of:
- converting a cylindrical blank by forming a plurality of longitudinal grooves oriented parallel to an axis of the cylindrical blank into the cylindrical blank;
- twisting the plurality of longitudinal grooves by a twisting tool to generate the helix with a slope and a pitch in a delivery region;
- converting, in a first portion of an outlet region of the helix, wherein a length of the first portion is at least one quarter of the pitch, the plurality of longitudinal grooves from an orientation parallel to the axis into an orientation in alignment with the slope;
- and
- forming a second portion of the outlet region of the helix with the plurality of longitudinal grooves oriented parallel to the axis.
Dependencies are inferred from the claim text.