Hydraulic hammering device

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11590642
APP PUB NO 20210086337A1
SERIAL NO

16633553

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Importance

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Abstract

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A hydraulic hammering device enables an auto-stroke mode and an idle strike prevention mode to coexist with a simple circuit configuration. A first control valve controls advancing and retracting movements of a piston and a second control valve select either the auto-stroke mode and the idle strike prevention mode. To the second control valve, a shared spool is slidably fitted and a mode selection means is disposed. When the mode selection means allows supply of pressurized oil to an auto-stroke setting portion of the shared spool and prohibits discharge of pressurized oil from an idle strike prevention setting portion, the auto-stroke mode is selected. When prohibiting supply of pressurized oil to the auto-stroke setting portion and allowing discharge of pressurized oil from the idle strike prevention setting portion, the idle strike prevention mode is selected.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
FURUKAWA ROCK DRILL CO LTD5-3 NIHONBASHI 1-CHOME CHUO-KU TOKYO 1030027

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kaneko, Tsutomu Takasaki, JP 37 207
Kobayashi, Isao Takasaki, JP 233 2788
Murakami, Susumu Takasaki, JP 87 1059
Nagano, Shinsuke Takasaki, JP 3 14
Shioda, Atsushi Takasaki, JP 7 50

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