Flat drill bit
AssigneeBosch Power Tools (China) Co., Ltd.
InventorsJun Ren, Chenying Li, Jie Lin
Life of this patent
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Abstract
A flat drill bit includes a stem body, a cut flute part provided axially from an end of the stem body and being generally flat-shaped, and a threaded guiding part provided axially from an end of the cut flute part. The cut flute part includes two longitudinal wings which are configured to be rotationally symmetrical to each other about a longitudinal central axis (O) of the flat drill bit. Each longitudinal wing is formed with a cutting edge at the end of the cut flute part from which the threaded guiding part extends. A rotating trajectory profile caused by the cutting edge when the flat drill bit rotates is inclined towards the stem body and is at an angle (a) relative to the longitudinal central axis (O), and the angle (a) is in a range between 84° and 86°.
Claims19
A flat drill bit comprising:
- a stem body;
- a substantially flat-shaped cut flute part extending axially from an end of the stem body;
- and
- a threaded guiding part extending axially from an end of the cut flute part,
- wherein the cut flute part includes two longitudinal wings which are rotationally symmetrical to each other about a longitudinal central axis of the flat drill bit,
- wherein each longitudinal wing of the two longitudinal wings is formed with a cutting edge at the end of the cut flute part, and
- wherein, when the flat drill bit rotates, a rotating trajectory profile caused by the cutting edge of each longitudinal wing is inclined towards the stem body and is at an angle relative to the longitudinal central axis in a range between 84° and 86°.
A flat drill bit, comprising:
- a stem body;
- a cut flute part extending axially from an end of the stem body;
- and
- a threaded guiding part extending axially from an end of the cut flute part opposing the stem body,
- wherein the stem body, the cut flute part, and the threaded guiding part are integrally formed with each other,
- wherein the cut flute part is defined with two longitudinal grooves which are radially opposite to each other relative to a longitudinal central axis of the flat drill bit,
- wherein the cut flute part is formed with two cutting edges at the end of the cut flute part, and observed in an axial view of the flat drill bit, the two cutting edges are inclined at an angle of less than 90° relative to the longitudinal central axis towards the stem body,
- wherein, in an axial end view of the flat drill bit, the two cutting edges are co-linear to each other and run across the longitudinal central axis.
Dependencies are inferred from the claim text.