Title:
掘削ロッド
Document Type and Number:
Japanese Patent JP7282813
Kind Code:
B2
Abstract:
To provide an excavation rod capable of smoothly transmitting a driving force from a rod rotary driving device, and having the optimal shape capable of securing usage quality.SOLUTION: An excavation rod 17 is mounted on the rotary driving device of a ground improvement machine and has the flow passage of a ground improvement agent therein. An outer periphery of the excavation rod 17 has four plane parts 17a formed by cutting off four parts of the outer periphery of a circular cross section in equal intervals in the peripheral direction. Width L between facing two plane parts is equally formed over the entire length of the excavation rod 17. Connection of the excavation rod 17 is formed as a torque transmission structure formed of a regular hexagonal shape in a cross section to engage a female side cylindrical part 24a with a male side shaft part 25a. A pin insertion hole for a connection pin 26 is formed of a female side groove 24c and a male side groove 25c parallel to the plane part of the outer periphery and the plane part forming a side of the regular hexagonal shape in a cross section, respectively. Besides, the two pin insertion holes are arranged in parallel with each other, separated by 180 degrees in the rod peripheral direction.SELECTED DRAWING: Figure 3
Inventors:
Tomohiko Yoshinaka
Aito Yamaguchi
Takaaki Isogai
Aito Yamaguchi
Takaaki Isogai
Application Number:
JP2021000970A
Publication Date:
May 29, 2023
Filing Date:
January 06, 2021
Export Citation:
Assignee:
Nippon Vehicle Manufacturing Co., Ltd.
International Classes:
E21B17/04
Domestic Patent References:
| JP2017082402A | ||||
| JP8209680A | ||||
| JP59024488U | ||||
| JP2015172324A | ||||
| JP2015178721A | ||||
| JP7189576A |
Attorney, Agent or Firm:
Yoshihiko Kido
Kazuhiko Kido
Kazuhiko Kido