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Patent Searching and Data


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 (1 Jungheung S-class, 976 Yongbong-Dong,Buk-Gu, Gwangju 500-845, 500-845, KR)
Application Number:
KR2009/007692
Publication Date:
June 30, 2011
Filing Date:
December 22, 2009
Export Citation:
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Assignee:
HANJIN D&B CO.,LTD. (621-20, Dochun-DongGwangsan-Gu, Gwangju 506-301, 506-301, KR)
(주)한진디엔비 (광주광역시 광산구 도천동 621-20, 506-301 Gwangju, 506-301, KR)
International Classes:
E21B1/30; E21B7/02
Domestic Patent References:
WO1999066167A1
Foreign References:
EP0507610A1
KR20050094702A
KR20060106388A
US3941196A
US4030554A
US3991834A
KR100372049B1
Other References:
See also references of EP 2518255A4
Attorney, Agent or Firm:
LEE, Jea Ryang (5F Small & Medium Business Support Center 621-15, Dochen-Dong Gwangsan-Gu, Gwangju 506-301, 506-301, KR)
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