JPH01105689U - - Google Patents
Info
- Publication number
- JPH01105689U JPH01105689U JP20083787U JP20083787U JPH01105689U JP H01105689 U JPH01105689 U JP H01105689U JP 20083787 U JP20083787 U JP 20083787U JP 20083787 U JP20083787 U JP 20083787U JP H01105689 U JPH01105689 U JP H01105689U
- Authority
- JP
- Japan
- Prior art keywords
- bar
- kelly bar
- joint part
- pin joint
- earth drill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Earth Drilling (AREA)
Description
第１図及び第２図は本考案の一実施例を示した
もので、第１図はケリーバの最縮小状態における
インナケリーバの下部拡大断面図、第２図は第１
図の―矢視断面図、第３図は右側を断面した
従来のケリーバの最伸長状態を示す側面図、第４
図は従来のケリーバの最縮小状態を示す拡大断面
図である。
1 and 2 show an embodiment of the present invention, in which FIG. 1 is an enlarged sectional view of the lower part of the inner kelly lever in its most contracted state, and FIG.
Fig. 3 is a cross-sectional view taken along the arrow in the figure, Fig. 3 is a side view showing the conventional Kerryva in its most extended state with the right side cut away, Fig. 4 is a side view showing the most extended state of the conventional Kerryva
The figure is an enlarged sectional view showing the conventional Kerryva in its most reduced state.
Claims (1)
は丸パイプ構造のインナケリーバ、セカンドケリ
ーバ、アウタケリーバ等によつて３段または４段
に構成されるアースドリルのケリーバにおいて、
前記インナケリーバのパイプ下端とピンジヨイン
ト部との溶接接続箇所を、該ピンジヨイント部の
外周に設置されている緩衝用ばねの自由長におけ
るばね座より上方位置に設定したことを特徴とす
るアースドリルのケリーバ。 In the earth drill kelly bar, which is composed of three or four stages including an inner keel bar, a second kelly bar, an outer kelly bar, etc., each having a rectangular or round pipe structure that can extend and contract with each other and is rotationally driven,
A kely bar of an earth drill, characterized in that the welded connection point between the lower end of the pipe of the inner keel lever and the pin joint part is set at a position above the spring seat in the free length of a buffer spring installed on the outer periphery of the pin joint part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20083787U JPH01105689U (en) | 1987-12-30 | 1987-12-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20083787U JPH01105689U (en) | 1987-12-30 | 1987-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01105689U true JPH01105689U (en) | 1989-07-17 |
Family
ID=31491226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20083787U Pending JPH01105689U (en) | 1987-12-30 | 1987-12-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01105689U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0798444A1 (en) * | 1990-06-12 | 1997-10-01 | Hitachi Construction Machinery Co., Ltd. | Cylindrical telescopic kelly-bar apparatus |
-
1987
- 1987-12-30 JP JP20083787U patent/JPH01105689U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0798444A1 (en) * | 1990-06-12 | 1997-10-01 | Hitachi Construction Machinery Co., Ltd. | Cylindrical telescopic kelly-bar apparatus |