CORE BIT AND EXCAVATOR - MITSUBISHI MATERIALS CORP

Title:

CORE BIT AND EXCAVATOR

Document Type and Number:

Japanese Patent JP2003094430

Kind Code:

A

Abstract:

To prevent the generation of resistance caused by the friction of the peripheral surface of the tube of a core bit and the wall surface of the hole of the tube.

The core bit 13 is constituted of the cylindrical tube 14 having a through-hole 14a and the bit 15 provided to the leading end of the tube 14. A spiral grinding particle layer 10a going toward the rear side of a rotary direction toward the front side thereof is formed to the inner peripheral surface 14' of the tube 14. A spiral abrasive particle layer 10b going toward the leading end side of the rotary direction toward the front side thereof is formed to the outer peripheral surface 14" of the tube 14.

More Like This:

JPH0731995	[Name of device] Bit for double pipe
JPH08155946	INNER AND OUTER DIAMETER PART REINFORCED DIAMOND BIT AND PRODUCTION THEREOF

Inventors:

MAZAKI SHIGERU
KAWAHARA TAKESHI
IMAOKA TOSHIO

Application Number:

JP2001287087A

Publication Date:

April 03, 2003

Filing Date:

September 20, 2001

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP
NIPPON DIAMOND KK

International Classes:

E21B10/48; B28D1/14; E21B3/00; (IPC1-7): B28D1/14; E21B3/00; E21B10/48

Attorney, Agent or Firm:

Masatake Shiga (6 people outside)

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