EXCAVATION TOOL - MITSUBISHI MATERIALS CORP

Title:

EXCAVATION TOOL

Document Type and Number:

WIPO Patent Application WO/2018/055728

Kind Code:

A1

Abstract:

An excavation tool according to the present invention comprises an attachment member provided with: a tool main body which is provided with an attachment hole section and to which a striking force is applied in the axial direction front end side; and an attachment shaft section. A concave groove is formed in the attachment shaft section, a locking pin is inserted into a pin hole formed in the tool main body and locked into the concave groove, and a fastening member for retaining the locking pin is attached in an opening section of the pin hole. A locking section for locking the fastening member is formed in the center line direction of the pin hole and a concave part is formed in an outer peripheral surface of the tool main body adjacent to the opening section of the pin hole. An auxiliary member that has a side surface that can contact a side surface of the concave part facing the fastening member and that maintains a locked state between the fastening member and the locking section is arranged in the concave part and a straight line that connects the center of the concave part and a center line of the pin hole extends in a direction intersecting an axial line when viewed in the center line direction of the pin hole.

Inventors:

NAKAMURA KAZUYOSHI (JP)
TAKATSUKI HIROKI (JP)

Application Number:

PCT/JP2016/078016

Publication Date:

March 29, 2018

Filing Date:

September 23, 2016

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

E21B17/04; E21B10/32

Domestic Patent References:

WO2016027739A1

2016-02-25

Foreign References:

JP4957440B2	2012-06-20
JP2004076370A	2004-03-11
JP4957440B2	2012-06-20

Other References: