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Patent Searching and Data


Title:
DIGGING TOOL
Document Type and Number:
Japanese Patent JPH03250190
Kind Code:
A
Abstract:

PURPOSE: To improve a lift of a digging tool by forming the periphery of almost semicircular blocks of a circular arc of different radius and the block, placed in a side of protruding from the peripheral surface of a device when it is rotated, in a peripheral radius larger than that of the block in the other side.

CONSTITUTION: The periphery of blocks 10a, 10b of semicircular shape as viewed in the bottom surface is constituted of circular arcs S1, S2 of different radius and a curve S3 of connected these circular arcs. Next, many bits 4... are implanted in point end surfaces of the blocks 10a, 10b and in a part of a protruding side by forming a radius R1, which constitutes the periphery of the part in the protruding side of the blocks 10a, 10b, larger than a radius R2 in a not protruding side. When the ground is excavated by rotating a device 2, the bits 4... in this protruding part are prevented from wearing, because the many bits 4... are implanted in this part, even for a large amount of work in the protruding part of the block 10a. In this way, a lift of a tool can be improved.


Inventors:
HAYASHI TAKESHI
SATO SHIGERU
TSUJIMOTO KATSUAKI
Application Number:
JP4823490A
Publication Date:
November 07, 1991
Filing Date:
February 28, 1990
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
E21B10/32; E21B6/00; E21B6/02; (IPC1-7): E21B6/00; E21B10/32
Domestic Patent References:
JPS5976391A1984-05-01
Attorney, Agent or Firm:
Masatake Shiga (2 outside)