JPH02116588U - - Google Patents
Info
- Publication number
- JPH02116588U JPH02116588U JP2602389U JP2602389U JPH02116588U JP H02116588 U JPH02116588 U JP H02116588U JP 2602389 U JP2602389 U JP 2602389U JP 2602389 U JP2602389 U JP 2602389U JP H02116588 U JPH02116588 U JP H02116588U
- Authority
- JP
- Japan
- Prior art keywords
- tips
- lengths
- tip
- core piece
- center
- 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
Landscapes
- Earth Drilling (AREA)
Description
第１図ないし第６図は本考案の一実施例を示す
もので、第１図は正面図、第２図は側面図、第３
図は第１図の−線に沿う断面図、第４図ない
し第６図はコアピースの一例を示すもので、第４
図は正面図、第５図は側面図、第６図は下面図、
第７図ないし第９図は従来のロツクドリルビツト
を示すもので、第７図は正面図、第８図は側面図
、第９図は第７図の−線に沿う断面図である
。
１０……ビツト本体、１１……コアピース、１
６，１７……チツプ。
Figures 1 to 6 show one embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 being a side view.
The figure is a sectional view taken along the - line in Figure 1, and Figures 4 to 6 show an example of the core piece.
The figure is a front view, Figure 5 is a side view, Figure 6 is a bottom view,
7 to 9 show a conventional lock drill bit, in which FIG. 7 is a front view, FIG. 8 is a side view, and FIG. 9 is a sectional view taken along the line - in FIG. 7. 10... Bit body, 11... Core piece, 1
6,17...chip.
Claims (1)
４角形状のコアピースが設けられ、かつこのコア
ピースの４辺に対向して４個のチツプが設けられ
たロツクドリルビツトにおいて、上記４個のチツ
プのうち少なくとも２個のチツプの長さが、他の
チツプの長さより上記ビツト本体の中心部側に長
く設定されたことを特徴とするロツクドリルビツ
ト。 In a lock drill bit, a core piece having a rectangular shape when viewed from the tip in the axial direction is provided at the center of the tip of the bit body, and four chips are provided opposite to each other on the four sides of this core piece. A lock drill bit characterized in that the lengths of at least two of the tips are set longer toward the center of the bit body than the lengths of the other tips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989026023U JP2540956Y2 (en) | 1989-03-07 | 1989-03-07 | Rock drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989026023U JP2540956Y2 (en) | 1989-03-07 | 1989-03-07 | Rock drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02116588U true JPH02116588U (en) | 1990-09-18 |
| JP2540956Y2 JP2540956Y2 (en) | 1997-07-09 |
Family
ID=31247269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989026023U Expired - Lifetime JP2540956Y2 (en) | 1989-03-07 | 1989-03-07 | Rock drill bit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2540956Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012237149A (en) * | 2011-05-12 | 2012-12-06 | Okabe Co Ltd | Drilling bit |
| JP2012237150A (en) * | 2011-05-12 | 2012-12-06 | Okabe Co Ltd | Drilling bit |
-
1989
- 1989-03-07 JP JP1989026023U patent/JP2540956Y2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012237149A (en) * | 2011-05-12 | 2012-12-06 | Okabe Co Ltd | Drilling bit |
| JP2012237150A (en) * | 2011-05-12 | 2012-12-06 | Okabe Co Ltd | Drilling bit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2540956Y2 (en) | 1997-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |