GB2423538A - Core drilling segments with side protection - Google Patents
Core drilling segments with side protection Download PDFInfo
- Publication number
- GB2423538A GB2423538A GB0503804A GB0503804A GB2423538A GB 2423538 A GB2423538 A GB 2423538A GB 0503804 A GB0503804 A GB 0503804A GB 0503804 A GB0503804 A GB 0503804A GB 2423538 A GB2423538 A GB 2423538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- segment
- shoulder
- drill
- core drill
- tubular body
- 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.)
- Withdrawn
Links
- 238000005553 drilling Methods 0.000 title description 8
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
- E21B10/485—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type with inserts in form of chisels, blades or the like
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
A core drill comprises a tubular body having a closed end adapted to be fitted to a drill and an open end with an annular face substantially normal to the longitudinal axis of the body, at least one drill segment fixed to the annular face, the at least one segment having a shoulder (8. 9) contacting the cylindrical surface of the tubular body to protect the seating area of the tube where the segment is fixed to the body. The shoulders may be formed on the inner face or the outer face of the segment relative to the tubular body, may be square cut or tapered, and may have a slanting edge to assist in debris removal..
Description
CORE DRILLING SEGMENTS
Field of the Invention
The present invention is concerned with core drilling segments and with protect- ing core drills from wear by the use of such segments.
Background to the Invention
Conventional core drills comprise a tubular support body having a closed end formed with a mechanism for attaching it to a drill and an open end spaced from the closed end by a cylindrical wall extending longitudinally along the axis of the drill. The open end defines an annular region on which are mounted one or more cutting teeth, better known as drilling segments or crowns.
The tubes are generally made of steel or other material designed to withstand the rigours of drilling into a variety of working media. Core drills are adapted to make an annular cut into such materials as concrete, rock and other hard materials so as to leave a pillar or cone within the cylindrical wall. The pillar can subsequently be removed. It is 1 5 therefore essential that the material of the tube and the manner in which the cutting seg- ments are fixed to the rim of the tube are substantial enough to perform the tasks re- quired of them.
Traditionally, segments have been fixed to the tubes by welding or brazing. The segments themselves may be individual or form part of a ring or crown adapted to be fit- ted to the tube as a single item. One of the disadvantages of using joining techniques that require high temperatures is that the hardness of the tube immediately surrounding the point where the segment is fixed can be altered and made less resistant to wear.
Several consequences of the point of attachment, known as the "segment seat- ing", being softened can manifest themselves. First, the tube in the region of the seat can wear at an excessive rate. This leads to undercutting of the tube and can reach a point where the segment physically collapses inwards or outwards of the tube when subjected to the stress of drilling. Second, cracks can readily develop in the area of the tube around the segment seat. If the drill is used in that condition, it is likely that the segments will col- lapse completely, possibly causing personal injury to the operator and/or damage to the drill and/or the area surrounding the drilling site. Both are undesirable consequences of poor fixing of the segment(s) to the tube body.
Specification MARCINTEP1 269 GBA2OO5-O1-1 4 doc
Additionally, the segments need to be positioned accurately during manufacture to ensure correct inside and outside clearance, typically 0. 25 to 0.5mm on either side. The placing is either done by automatic placing machinery or manually, with magnets to hold the segments in position until welded. However, if the machinery or the magnets become worn or dirty, the placing of the segments may be incorrect, in that the outside and inside clearances are incorrect or the segment does not stand perfectly perpendicular to the tube end. Each segment which is not fitted correctly adversely affects the performance of the core drills to a considerable extent, because the drill has to remove more material, thereby reducing drilling speed, and wear is increased.
The present invention therefore aims to alleviate or eradicate these problems.
US Patent Application US 2003/0029643, discloses a core drill segment having an elongate support member designed to clip into the interior of a tubular body forming part of a drill. The cutting portion of the segment has a groove-like recess to accept the outward end of the elongate support. The edges of the groove do not operate to protect 1 5 the tubular body from wear or erosion etc as in the present invention.
Summary of the Invention
The invention provides a core drill comprising a tubular body having a closed end adapted to be fitted to a drill and an open end with an annular face substantially normal to the longitudinal axis of the body, at least one drill segment fixed to the annular face, the at least one segment having a shoulder contacting the cylindrical surface of the tubular body to protect the seating area of the tube where the segment is fixed to the body.
The shoulder may be formed on the inner face or the outer face of the segment relative to the tubular body.
The shoulder may be square cut or tapered. Alternatively, the shoulder may have a slanting edge or face or may be formed as an inverted V-shape. In this way, the slanting face or edge may assist debris removal from the cutting site.
The segment may be of sintered construction or may be a unitary body incorpo- rating a cutting surface.
Where a plurality of segments are provided, they may be formed in a crown or a ring and each or some of the individual cutting parts of the ring or crown may be formed with the aforesaid protective shoulders.
Specification MARCINTEP1 269 GBA2OO5-O1-1 4 cioc
The protective shoulders not only ensure correct positioning of the segments on the tube end and so accurate cutting, but also afford a substantially greater bonding area with the tube, thereby increasing tearoff strength and so reducing segment loss.
Brief Description of the Drawings
The invention will now be described with reference to the following drawings, of which: Figure 1 shows a sectional view of a conventional core drill; Figure 2 is a side elevation of the drill in Figure 1; Figure 3 illustrates diagrammatically the result of wear at the seating area; Figure 4 is a side elevation showing two different constructions of the segment in accordance with the invention; Figure 5 is a detail of a segment with a square shoulder; Figure 6 is a detail of a segment with a tapered shoulder; Figure 7 is a segment with a slanting side or wing; 1 5 Figure 8 is a variation on Figure 7 but showing a pointed wing; and Figure 9 is a further variation of segment shape.
Detailed Description of the Illustrated Embodiments Referring fIrst to Figure 1, this illustrates schematically a conventional core drill 1 having a tubular body 2 formed with a closed end on which is provided a fixing means 3 to enable the drill to be mounted on a driver. At the opposite end, the body is open and has an annular surface on which one or more cutting segments are directly mounted.
Conventional fixing methods, such as brazing, welding or sintering are used.
The difficulty with this construction is that the seating areas, such as 5 in Figure 2, can be compromised as a consequence of the fixing method. This can lead to cracking of the body around the seating area. Also, erosion and wear of the seating area can lead to narrowing or "undercutting" of the seating area in the immediate vicinity of the seating area, as illustrated at 6 in Figure 3. In severe cases, the segments can fold inwards or outwards, as indicated at 7 in Figure 3, and can even be sheared off completely.
The present invention offers a protective shoulder to minimise deleterious effects on the tubular body. In Figure 4, two different constructions are represented. One seg- ment has a triangular shoulder 8 extending from the segment per se and along a cylindri-
Specification MARCINTEP1 269 GBA 2OO5-O1-1 4 doc
cal side face of the body 2. In the other example shown in Figure 4, the shoulder is square cut and extends a smaller distance along the body.
Figure 5 illustrates a detail of a segment 9 in cross-section. The segment 9 has an upstanding portion or shoulder 1 0 extending a short way along the outer cylindrical sur- face of the body. The variation shown schematically in Figure 6 has a chamfered or ta- pered surface 20 extending along the body. It is conceivable that the shoulders in any embodiment may extend along one or other or both side faces of the tubular body to protect the seating area from wear in any direction.
Figure 7 shows another variation, in which the shoulder is formed as a wing 30 with a rounded end. Figure 8 is similar except that the end of the wing is pointed 40. In a further variation, as shown in Figure 9, the segment consists of a cutting body 9 formed with an inverted V-shaped shoulder portion 50.
Advantages of the shoulders being formed with edges or surfaces inclined to the longitudinal axis of the body are that they aid in the cutting operation, either providing a 1 5 further cutting edge or assisting in debris removal in a similar way to the spiral (flute) of a masonry drill.
Specification MARCINTEP1 269 GBA2OO5-O1-1 4 doc
Claims (10)
1. A core drill comprising a tubular body having a closed end adapted to be fitted to a drill and an open end with an annular face substantially normal to the longitudi- nal axis of the body, at least one drill segment fixed to the annular face, the at least one segment having a shoulder contacting the cylindrical surface of the tubular body to pro- tect the seating area of the tube where the segment is fixed to the body.
2. A core drill as claimed in Claim 1, wherein the shoulder is formed on the inner face or the outer face of the segment relative to the tubular body.
3. A core drill as claimed in Claim 1 or Claim 2, wherein the shoulder is square cut.
4. A core drill as claimed in Claim 1 or Claim 2, wherein the shoulder is ta- pered.
5. A core drill as darned in any of Claims 1 to 4, wherein the shoulder has a slanting edge.
6. A core drill as claimed in any of claims 1 to 5, wherein the shoulder has a slanting face.
7. A core drill as claimed in any of Claims 1 to 6, wherein the shoulder is formed as an inverted V-shape.
8. A core drills as claimed in any of Claims 1 to 7, wherein the segment is of sintered construction, comprising a cutting surface.
9. A core drill as claimed in any of Claims 1 to 8 comprising a plurality of segments formed in a crown or a ring, at least some of the individual cutting parts of the ring or crown being formed with said shoulders.
10. A core drill substantially as herein described with reference to the draw- ings.
Specification MARCINTEP1 269 GBA2OO5-O1-1 4 doc
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0503804A GB2423538A (en) | 2005-02-24 | 2005-02-24 | Core drilling segments with side protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0503804A GB2423538A (en) | 2005-02-24 | 2005-02-24 | Core drilling segments with side protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0503804D0 GB0503804D0 (en) | 2005-03-30 |
| GB2423538A true GB2423538A (en) | 2006-08-30 |
Family
ID=34401232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0503804A Withdrawn GB2423538A (en) | 2005-02-24 | 2005-02-24 | Core drilling segments with side protection |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2423538A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4208154A (en) * | 1978-03-21 | 1980-06-17 | Gundy William P | Core drill |
| US4211294A (en) * | 1978-04-21 | 1980-07-08 | Acker Drill Company, Inc. | Impregnated diamond drill bit |
| EP0156762A1 (en) * | 1984-03-05 | 1985-10-02 | HILTI Aktiengesellschaft | Trepaning cutter |
| EP0280835A1 (en) * | 1987-03-02 | 1988-09-07 | HILTI Aktiengesellschaft | Hollow drill tool |
| EP0352546A2 (en) * | 1988-07-25 | 1990-01-31 | HILTI Aktiengesellschaft | Core drill bit |
| US5823276A (en) * | 1996-12-24 | 1998-10-20 | Beck, Iii; August H. | Diamond-tipped core barrel and method of using same |
-
2005
- 2005-02-24 GB GB0503804A patent/GB2423538A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4208154A (en) * | 1978-03-21 | 1980-06-17 | Gundy William P | Core drill |
| US4211294A (en) * | 1978-04-21 | 1980-07-08 | Acker Drill Company, Inc. | Impregnated diamond drill bit |
| EP0156762A1 (en) * | 1984-03-05 | 1985-10-02 | HILTI Aktiengesellschaft | Trepaning cutter |
| EP0280835A1 (en) * | 1987-03-02 | 1988-09-07 | HILTI Aktiengesellschaft | Hollow drill tool |
| EP0352546A2 (en) * | 1988-07-25 | 1990-01-31 | HILTI Aktiengesellschaft | Core drill bit |
| US5823276A (en) * | 1996-12-24 | 1998-10-20 | Beck, Iii; August H. | Diamond-tipped core barrel and method of using same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0503804D0 (en) | 2005-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |