Title:
FLAT DRILL
Document Type and Number:
WIPO Patent Application WO/2020/082976
Kind Code:
A1
Abstract:
A flat drill (100). The flat drill (100) comprises: a handle body (10); a cutting and chip removal part (20) which is axially provided from one end of the handle body (10) and is substantially in a flat shape; and a threaded guide part (30) which is axially provided from one end of the cutting and chip removal part (20). The cutting and chip removal part (20) has two longitudinal wing parts (23); the two longitudinal wing parts (23) are provided to be rotationally symmetric with respect to a longitudinal central axis (O) of the flat drill (100), and a cutting blade (21a) is formed, by each longitudinal wing part (23), at the end of the cutting and chip removal part (20) where the threaded guide part (30) is formed by extension; an angle is formed between a direction inclined from a rotation track surface generated by the cutting blade (21a) during rotation of the flat drill (100) towards the handle body (10) and the longitudinal central axis (O), the angle ranging from 84 degrees to 86 degrees. The torque generated by the flat drill during collision is small, so that the integrity of a cutting blade can be protected.
Inventors:
LIN JIE (CN)
LI CHENYING (CN)
REN JUN (CN)
LI CHENYING (CN)
REN JUN (CN)
Application Number:
PCT/CN2019/108124
Publication Date:
April 30, 2020
Filing Date:
September 26, 2019
Export Citation:
Assignee:
BOSCH POWER TOOLS CHINA CO LTD (CN)
International Classes:
B23B51/00; B27G15/00
Foreign References:
| DE2654400A1 | 1978-06-08 | |||
| DE2654400A1 | 1978-06-08 | |||
| CN200984763Y | 2007-12-05 | |||
| CN201217206Y | 2009-04-08 | |||
| CN103341656A | 2013-10-09 | |||
| US6652202B2 | 2003-11-25 | |||
| US5193951A | 1993-03-16 |
Other References:
See also references of EP 3871816A4
Attorney, Agent or Firm:
NTD UNIVATION INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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