Title:
HAMMER RAISING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/187691
Kind Code:
A1
Abstract:
The present invention relates to a hammer raising device, and more specifically relates to a hammer raising device for eliminating fluid resistance and so increasing the striking strength when a piston that has ascended up moves down. To this end, the hammer raising device of the present invention comprises: a hydraulic pressure control valve for controlling the supply of fluid; a sub-cylinder which receives a supply of fluid due to operation of the hydraulic pressure control valve; a sub-piston of which part is accommodated in the sub-cylinder and which rises or descends due to the fluid; a main piston which is intimately attached to an end of the sub-piston so as to rise due to the rising of the sub-piston, and descends when the end of the intimately attached sub-piston is distanced; and a main cylinder which accommodates the main piston.
Inventors:
LEE JONG JIK (KR)
Application Number:
PCT/KR2013/005180
Publication Date:
December 19, 2013
Filing Date:
June 12, 2013
Export Citation:
Assignee:
SHINWOO HEAVY INDUSTRY CO LTD (KR)
International Classes:
E21B1/38; E21B1/26
Foreign References:
| JP2002241086A | 2002-08-28 | |||
| KR20070041043A | 2007-04-18 | |||
| JPH07157240A | 1995-06-20 | |||
| KR20110098352A | 2011-09-01 |
Attorney, Agent or Firm:
DARAE IP FIRM (KR)
특허법인 다래 (KR)
특허법인 다래 (KR)
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