公开(公告)号：US298919A

公开(公告)日：1884-05-20

申请号：US298919D

CPC classification number: B25D9/18

公开(公告)号：US274647A

公开(公告)日：1883-03-27

申请号：US274647D

CPC classification number: B25D9/18

公开(公告)号：US256515A

公开(公告)日：1882-04-18

申请号：US256515D

CPC classification number: B25D9/18

公开(公告)号：US207226A

公开(公告)日：1878-08-20

申请号：US207226D

CPC classification number: B25D9/18

公开(公告)号：US174956A

公开(公告)日：1876-03-21

申请号：US174956D

CPC classification number: B25D9/18

公开(公告)号：US12070844B2

公开(公告)日：2024-08-27

申请号：US17521044

申请日：2021-11-08

Applicant: Furukawa Rock Drill Co., Ltd.

Inventor： Tsutomu Kaneko ,  Susumu Murakami ,  Isao Kobayashi ,  Atsushi Shioda ,  Shinsuke Nagano

IPC: B25D9/04 ,  B25D9/18 ,  B25D9/26

CPC classification number: B25D9/04 ,  B25D9/18 ,  B25D9/26 ,  B25D2250/131

Abstract: A hydraulic hammering device enables an auto-stroke mode and an idle strike prevention mode to coexist with a simple circuit configuration. The device includes a first control valve to control advancing and retracting movements of a piston, an auto-stroke mode and an idle strike prevention mode, and a second control valve to select either of the auto-stroke mode or 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.

公开(公告)号：US11850717B2

公开(公告)日：2023-12-26

申请号：US17296538

申请日：2019-11-07

Applicant: TEISAKU CORPORATION

Inventor： Masanori Ito ,  Hiroshi Fujimoto

IPC: B25D17/02 ,  B25D9/18 ,  B25D9/14

CPC classification number: B25D9/145 ,  B25D9/18 ,  B25D17/02 ,  B25D2209/002

Abstract: A fluid pressure hitting device comprises a piston inserted in a cylinder, a chisel, and a first, second, and third chambers. The chisel is fitted in the cylinder such that a part of the chisel projects from one axial end of the cylinder and is configured to further project from that axial end due to being hit by the piston as the piston slides toward the one axial end. The first through third chambers are partitioned by an inner peripheral surface of the cylinder and an outer peripheral surface of the piston. The first through third chambers are arranged in the axial direction in order fluid the one axial end to another axial end of the cylinder. A flow path is configured to supply fluid from a fluid supply portion when the piston hits the chisel, to the first chamber.

公开(公告)号：US20180345470A1

公开(公告)日：2018-12-06

申请号：US15778884

申请日：2016-11-30

Applicant: Montabert

Inventor： Bernard Piras

IPC: B25D17/24 ,  B25D9/12 ,  B25D9/18 ,  B25D9/26

CPC classification number: B25D9/12 ,  B25D9/18 ,  B25D9/26 ,  B25D17/245 ,  B25D2217/0023 ,  B25D2250/195

Abstract: The invention concerns a rock breaking device comprising a striking cell having at least one actuation chamber, a striking piston, and a hydraulic circuit comprising a hydraulic supply source having a High Pressure circuit and a Low Pressure circuit, and an actuator configured to connect the High Pressure circuit or the Low Pressure circuit to the actuation chamber so as to move the piston in translation in the striking cell in a normal movement area of which the limits are variable depending on the pressure difference between the High Pressure circuit and the Low Pressure circuit, the striking cell comprising depressurizing means configured to control the establishment of hydraulic communication between the High Pressure circuit and the Low Pressure circuit when the striking piston exits a predefined movement area.

公开(公告)号：US09988843B2

公开(公告)日：2018-06-05

申请号：US14411993

申请日：2013-06-21

Applicant: Il Jae Lee

Inventor： Il Jae Lee

IPC: B25D9/12 ,  B25D9/18 ,  B25D17/00 ,  E02D7/10 ,  E21B4/14

CPC classification number: E21B4/14 ,  B25D9/12 ,  B25D9/18 ,  B25D17/00 ,  B25D2250/065 ,  B25D2250/105 ,  B25D2250/121 ,  B25D2250/231 ,  E02D7/10

Abstract: The present invention relates to a impact body for a hydraulic impact device and, more specifically, to a impact body for a hydraulic impact device which is capable of remarkably reducing production costs by inserting a cylinder liner having a flow path into an inner wall of a body, adjusting an impact interval and an impact strength according to the properties of a material to be crushed by adjusting an impact distance of a piston, minimizing the loss of a fluid in a pipe by forming a cylindrical flow path between the body and the cylinder liner, and remarkably improving performance by employing a circular valve to shorten the flow path whereby reduction of pressure is minimized.

公开(公告)号：US09981371B2

公开(公告)日：2018-05-29

申请号：US14364011

申请日：2012-12-03

Applicant: MONTABERT

Inventor： Jean-Sylvain Comarmond

IPC: B25D9/26 ,  B25D9/14 ,  B25D9/18

CPC classification number: B25D9/26 ,  B25D9/145 ,  B25D9/18

Abstract: A switching method includes starting up a percussion device in acting on a control device arranged to vary the striking stroke of the striking piston between a short striking stroke and a long striking stroke. The percussion device is forced to operate on a short striking stroke for a predetermined period of time from the starting up of the device, and in acting on the control device so as to allow the percussion device to operate on a long striking stroke, after the expiry of the predetermined period of time.