Title:
ビット脱着装置
Document Type and Number:
Japanese Patent JP6920690
Kind Code:
B2
Abstract:
To enable smooth separation of a bit from a boring rod.SOLUTION: A bit attaching/detaching device comprises a latch case 4 having a bit 3 attached to its end and provided with a rotatable latch pawl 8, a packer tube 20 including a packer 22 and inserted into a boring rod 6 together with a water conduit in communication with the water conduit for taking out the spring water, a latch release member 30 attached to the packer tube 20 and inserted into the latch case 4 to rotate the latch pawl 8 in a disengaging direction, a coupling latch 34 for coupling the latch case 4 and the latch release member 30 by inserting the latch release member 30 into the latch case 4, and a release pin 39 for rotating the coupling latch 34 in the disengaging direction.SELECTED DRAWING: Figure 3
More Like This:
| WO/2009/102526 | METHODS FOR THE IDENTIFICATION OF BUBBLE POINT PRESSURE |
| WO/2017/205077 | WELL FLUID ANALYSIS SYSTEM |
| WO/2016/065009 | THREE-PHASE FLOW IDENTIFICATION AND RATE DETECTION USING ACOUSTIC GUIDE ARRAY |
Inventors:
Ken Oka
Satoshi Kuga
Kazuyuki Hara
Saeki Yasushi Akira
Satoshi Kuga
Kazuyuki Hara
Saeki Yasushi Akira
Application Number:
JP2017170140A
Publication Date:
August 18, 2021
Filing Date:
September 05, 2017
Export Citation:
Assignee:
Mining Industry Co., Ltd.
Hara Kogyo Co., Ltd.
Hara Kogyo Co., Ltd.
International Classes:
E21B49/08; E02D1/06; E21B10/62
Domestic Patent References:
| JP5155761B2 | ||||
| JP2007016394A | ||||
| JP2002106279A |
Foreign References:
| US20040206496 |
Attorney, Agent or Firm:
Kyosei International Patent Office