Title:
液圧ダウンザホールハンマー
Document Type and Number:
Japanese Patent JP6421180
Kind Code:
B2
Abstract:
The present invention relates to a hydraulically powered percussion mechanism (12), comprising a piston (6) to impact a percussion bit (8). The percussion mechanism also includes a first accumulator assembly (3a) for hydraulic fluid. The first accumulator assembly comprises a plurality of first accumulator elements (27). In a first aspect, the plurality of first accumulator elements are arranged in a common housing (14). In a second aspect, each of the first accumulator elements is arranged at the same proximity to the piston. In a third aspect, each of the first accumulator elements comprises an accumulator membrane (32) or piston, and wherein the primary direction of movement of the membrane or piston in contact with the hydraulic fluid is substantially parallel to a longitudinal axis of the mechanism.
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Inventors:
Joseph Purcell
John Kosovich
John Kosovich
Application Number:
JP2016522518A
Publication Date:
November 07, 2018
Filing Date:
June 26, 2014
Export Citation:
Assignee:
MINCON INTERNATIONAL LIMITED
International Classes:
B25D9/14
Domestic Patent References:
| JP2013505376A | ||||
| JP61279473A | ||||
| JP57170977U |
Foreign References:
| US3465834 | ||||
| WO2012138287A1 | ||||
| WO1998051900A1 | ||||
| WO1999027192A1 |
Attorney, Agent or Firm:
Kenji Sugimura
Tatsuya Tanaka
Kenichiro Kataoka
Tatsuya Tanaka
Kenichiro Kataoka