JPH0477688U - - Google Patents
Info
- Publication number
- JPH0477688U JPH0477688U JP12133990U JP12133990U JPH0477688U JP H0477688 U JPH0477688 U JP H0477688U JP 12133990 U JP12133990 U JP 12133990U JP 12133990 U JP12133990 U JP 12133990U JP H0477688 U JPH0477688 U JP H0477688U
- Authority
- JP
- Japan
- Prior art keywords
- drilling bit
- arc
- hammer body
- tip
- bit
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims description 7
Landscapes
- Earth Drilling (AREA)
Description
第１図は実施例を示す一部切欠側面図、第２図
は第１図のＡ−Ａにおける一部切欠断面図、第３
図は使用状態を示す説明図、第４図は他の実施例
を示す一部切欠側面図、第５図は同底面図である
。
１……掘削ビツト、２……背面部、３……偏心
シヤフト、４……ケーシングパイプ、５……ハン
マーボデイ、６……先端部、７……偏心孔、８…
…円弧状突起、９……円弧状溝、１０，１１……
中心軸線、１２……地盤、１３……直径、１４…
…内径、１５……地中孔、１６……外径、１７…
…ボール、１８……キヤツプ、１９……掘削ビツ
ト、２０……ハンマーボデイ、２１……中心軸線
、２２……センターガイド。
Fig. 1 is a partially cutaway side view showing the embodiment, Fig. 2 is a partially cutaway sectional view taken along A-A in Fig. 1, and Fig. 3 is a partially cutaway side view showing the embodiment.
The figure is an explanatory view showing the state of use, FIG. 4 is a partially cutaway side view showing another embodiment, and FIG. 5 is a bottom view of the same. DESCRIPTION OF SYMBOLS 1...Drilling bit, 2...Back part, 3...Eccentric shaft, 4...Casing pipe, 5...Hammer body, 6...Tip part, 7...Eccentric hole, 8...
...Circular projection, 9...Circular groove, 10, 11...
Center axis line, 12... Ground, 13... Diameter, 14...
...Inner diameter, 15...Underground hole, 16...Outer diameter, 17...
... Ball, 18 ... Cap, 19 ... Drilling bit, 20 ... Hammer body, 21 ... Center axis line, 22 ... Center guide.
補正 平２．１１．３０
図面の簡単な説明を次のように補正する。
明細書中９頁３行目の「５……ハンマーボデイ
」とあるを「５……ビツトシヤンク」に、同頁１
０行目の「２０……ハンマーボデイ」とあるを「
２０……ビツトシヤンク」に補正し、同頁１１行
目の「２２……センターガイド」の後に「２３…
…ハンマーボデイ」を追加する。Amendment November 30, 1992: The brief description of the drawing is amended as follows. In the specification, page 9, line 3, "5...hammer body" has been changed to "5...bitshank" on page 1.
In line 0, replace "20...hammer body" with "
20... bit shank", and after "22... center guide" on the 11th line of the same page, "23...
…Add “Hammer Body”.
Claims (1)
ーシングパイプ内のハンマーボデイの先端部に設
けた偏心孔に着脱自在に挿入し、 同掘削ビツトの背面部と同ハンマーボデイの先
端部との摺動面に、互いに嵌合する円弧状突起と
円弧状溝とを設け、同円弧状突起の長さより同円
弧状溝の長さを長くし、同掘削ビツトの中心軸線
と同ハンマーボデイの中心軸線とが一致する位置
から同掘削ビツトが同偏心シヤフトを中心として
所定角度だけ回動自在な機構を設けたことを特徴
とする２重管式掘削ビツト。[Scope of Claim for Utility Model Registration] An eccentric shaft provided on the back of a drilling bit is removably inserted into an eccentric hole provided at the tip of a hammer body in a casing pipe, and An arc-shaped projection and an arc-shaped groove that fit into each other are provided on the sliding surface with the tip of the drill bit, and the length of the arc-shaped groove is longer than the length of the arc-shaped projection, and the center axis of the drilling bit is A double-pipe drilling bit characterized in that the drilling bit is provided with a mechanism that allows the drilling bit to rotate by a predetermined angle around the eccentric shaft from a position where the central axis of the hammer body coincides with the central axis of the hammer body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12133990U JPH0721677Y2 (en) | 1990-11-19 | 1990-11-19 | Double pipe drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12133990U JPH0721677Y2 (en) | 1990-11-19 | 1990-11-19 | Double pipe drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0477688U true JPH0477688U (en) | 1992-07-07 |
| JPH0721677Y2 JPH0721677Y2 (en) | 1995-05-17 |
Family
ID=31869198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12133990U Expired - Lifetime JPH0721677Y2 (en) | 1990-11-19 | 1990-11-19 | Double pipe drill bit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0721677Y2 (en) |
-
1990
- 1990-11-19 JP JP12133990U patent/JPH0721677Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0721677Y2 (en) | 1995-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |