AIR HAMMER FOR A BORING MACHINE - HANJIN D & B CO LTD

Title:

AIR HAMMER FOR A BORING MACHINE

Document Type and Number:

WIPO Patent Application WO/2011/078421

Kind Code:

A1

Abstract:

According to the present invention, an air hammer for a boring machine comprises: a main body including a hollow portion; a socket coupled to a side of the main body; a first bushing member including a sealing part coupled to the main body, a piston guide part extending from the sealing part in parallel with a central axis of the main body and defining an air supply passage along the latter in the lengthwise direction, and a discharge hole defined in an outer surface thereof to communicate with the air supply passage; a second bushing member installed at an end on the opposite side of the main body; a bit unit installed at an end of the second bushing member; a pneumatic discharge part, the top and bottom ends of which are supported by the guide part and the second bushing member so as to be raised and lowered, defining a guide hole therethrough in the lengthwise direction, and provided with a piston hammer partitioning a main body compartment between the first and second bushing members into a first and second chamber, the pneumatic discharge part being formed at the top end of the second bushing member to discharge air in a second chamber when the piston hammer is raised; and a pneumatic pressure distribution part formed on the piston hammer to selectively supply, in conjunction with the socket and to the first and second chambers, pneumatic pressure supplied through a pneumatic pressure supply passage and discharge hole of the piston guide part of the first bushing member, so as to raise the piston hammer.

Inventors:

IN SUK SIN (KR)

Application Number:

PCT/KR2009/007692

Publication Date:

June 30, 2011

Filing Date:

December 22, 2009

Export Citation:

Click for automatic bibliography generation Help

Assignee:

HANJIN D & B CO LTD (KR)
IN SUK SIN (KR)

International Classes:

E21B1/30; E21B7/02

Domestic Patent References:

WO1999066167A1

1999-12-23

Foreign References:

EP0507610A1	1992-10-07
KR20050094702A	2005-09-28
KR20060106388A	2006-10-12
US3941196A	1976-03-02
US4030554A	1977-06-21
US3991834A	1976-11-16
KR100372049B1	2003-02-14

Other References: