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Patent Searching and Data


Title:
HYDRAULIC STRIKING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/043175
Kind Code:
A1
Abstract:
The purpose of the invention is to provide a hydraulic striking device for which striking characteristics can be easily changed. Provided is a hydraulic striking device, wherein: a reverse operation circuit (101) and a forward operation circuit (102) are connected to a switching valve mechanism (210), and these circuits can switch the connection state to a high pressure circuit (103) and a low pressure circuit (104) via an operation switching valve (105); a valve biasing means comprises a reverse operation biasing means that operates when the reverse operation circuit (101) is connected to the high pressure circuit (103), and a forward operation biasing means that operates when the forward operation circuit (102) is connected to the high pressure circuit (103); the hydraulic striking device is configured such that a reverse operation mode and a forward operation mode can be selected according to the operation of the operation switching valve (105); and a high-low pressure switching unit is provided with a shortening means for decreasing the time for a high-low pressure switching operation for a piston front and rear chamber that accompanies retracting a valve (300) to be less than the time for the high-low pressure switching operation for a piston front and rear chamber that accompanies advancing the valve (300).

Inventors:
MATSUDA Toshio (1058, Yoshii, Yoshiimachi, Takasaki-sh, Gunma 32, 〒3702132, JP)
Application Number:
JP2017/029752
Publication Date:
March 08, 2018
Filing Date:
August 21, 2017
Export Citation:
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Assignee:
FURUKAWA ROCK DRILL CO.,LTD. (5-3 Nihonbashi 1-chome, Chuo-ku Tokyo, 27, 〒1030027, JP)
International Classes:
B25D9/26
Domestic Patent References:
WO2015115105A12015-08-06
Foreign References:
EP0739691A11996-10-30
JP2005177899A2005-07-07
JPH02298477A1990-12-10
JPS51111401A1976-10-01
Attorney, Agent or Firm:
MORI Tetsuya et al. (NICHIEI Patent and Trademark Attorneys, Shiroyama Trust Tower 32F 3-1, Toranomon 4-chome, Minato-k, Tokyo 32, 〒1056032, JP)
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