HYDRAULIC ROTATING STRIKING DEVICE

WIPO Patent Application WO/2014/208922

A1

The present invention relates to a hydraulic rotating striking device having a shock buffering device, which is configured to buffer a shock, formed to be able to reciprocate inside a body portion of the striking device. The hydraulic rotating striking device comprises, between the body portion and the outer peripheral surface of the shock device, a high-pressure chamber, a first low-pressure chamber, a second low-pressure chamber, a first pressure chamber, and a second pressure chamber, respectively. The shock buffering device is characterized by comprising: an annular collar portion formed at the center of an outer diameter portion; an upper diameter portion formed on the upper side of the collar portion, the upper end surface of the upper diameter portion facing the inner upper end of the body portion; a lower diameter portion formed on the lower side of the collar portion, the lower end surface of the lower diameter portion facing a striking surface of a shank; and a second bypass channel for establishing communication between the high-pressure chamber and the second pressure chamber, when the distance of movement is below a preset distance during a boring operation, and interrupting the communication between the high-pressure chamber and the second pressure chamber, when the distance of movement is equal to or above the preset distance.

KIM JIN-KOOK (KR)

PCT/KR2014/005334

December 31, 2014

June 18, 2014

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EVERDIGM CORP (KR)

E21B1/26; E21B1/36

JP2001341083A	2001-12-11
KR20100039036A	2010-04-15
KR20040091661A	2004-10-28
KR20090006657A	2009-01-15

SINJI PATENT FIRM (KR)
특허법인 신지 (KR)

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