WO1990002244A1 - A drill for rock and concrete - Google Patents

A drill for rock and concrete Download PDF

Info

Publication number
WO1990002244A1
WO1990002244A1 PCT/SE1988/000416 SE8800416W WO9002244A1 WO 1990002244 A1 WO1990002244 A1 WO 1990002244A1 SE 8800416 W SE8800416 W SE 8800416W WO 9002244 A1 WO9002244 A1 WO 9002244A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill
tube
cutting bit
openings
holder part
Prior art date
Application number
PCT/SE1988/000416
Other languages
French (fr)
Inventor
Tonie SCHAGERSTRÖM
Original Assignee
Schagerstroem Tonie
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to SE8700679A priority Critical patent/SE456808B/en
Application filed by Schagerstroem Tonie filed Critical Schagerstroem Tonie
Priority to PCT/SE1988/000416 priority patent/WO1990002244A1/en
Priority to EP88908402A priority patent/EP0429444A1/en
Publication of WO1990002244A1 publication Critical patent/WO1990002244A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/02—Percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/06—Drills with lubricating or cooling equipment
    • 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
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B28D1/146—Tools therefor
    • 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
    • E21B10/36—Percussion drill bits
    • E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
    • 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
    • E21B10/58—Chisel-type inserts
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/02—Swivel joints in hose-lines
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/62—Use of suction

Definitions

  • Drills for making holes in rock and concrete and intended for use with electrical hand drilling machines are generally made with carbide tips, which are fastened by brazing to a steel shank. Drilling is generally done dry, and the drilling machines generally provide torque and axial blows. During drilling the rock is crushed and pulverized due to the percus ⁇ sive and rotating contact with the carbide tip.
  • Drilling in a downward direction is more difficult to perform than in other directions for two reasons, both depending on difficulties with conveying the rock dust.
  • the rock dust easily compacts in the grooves, and also it is not lifted up from the bottom of the hole to the beginning of the grooves and packs around the drill tips to prevent blows being trans ⁇ ferred to the rock.
  • When drilling in a downward direction it is therefore necessary to lift the drill out after a short drilling length and clean the whole by blowing. This is particularly applicable with drilling in moist rock or con ⁇ crete. The result will be that the straightness of the hole and its roundness deteriorate, as well as the bore tip becoming worn more rapidly.
  • the rock When drilling in mines and the like, and when large hole dia ⁇ meter holes are made in concrete, the rock is generally removed by blowing in air, or pumping in water or water mixed with air at an excess pressure through the drill rod, which is made hollow for this purpose and without helical grooves.
  • the rock dust is here conveyed out from the hole in the space between the outside of the drill rod and the wall of the hole.
  • the present invention relates to a drill with a carbide cutting bit extending over the entire diameter of the hole, and adpated for drilling holes in rock or concrete without the supply of liquid, the dry rock dust being removed by suction in one or more ducts in the interior of the drill rod.
  • their openings at the bit are made with a less area than the rest of the duct and with a sharp edge.
  • the drill rod is made with a smooth cylindrical exterior of a less diameter than the length of the bit.
  • carbide is relatively brittle, and can crack for unevenly distributed percussion, the carbide bit should be brazed into a holder part which supports the major part of the bit length, and in turn receives the precus- sion effect from the entire cross sectional area of the drill rod.
  • the upper end of the drill rod is formed in a manner known per se for transmission of percussion and torque from the drilling machine.
  • Figure 1 is side view of one embodiment of the invention
  • Figure 2 illustrates the embodiment in Figure 1 with a means mounted on it for connection to a suction means
  • FIG. 3 illustrates an alterantive embodiment
  • Figure 4 is a side view of the cutting bit and holder part separated from the drill rod in Figure 1,
  • Figure 5 is a side view of the cutting bit and holder part in Figure 4,
  • Figure 6 is a front view of the cutting bit and holder part in Figures 4-5.
  • Figure 7 illustrates the shank and a connection part
  • FIG. 8 illustrates an alternative embodiment
  • the part 13 is made, for large drill dia ⁇ meters, with an axially projecting tubular spigot 17, which is thrust into the tube 11.
  • the cavity 27 is formed in the part 13 with a stepped bore so that the shoulder 16 will be situated inside the bore.
  • the drill rod 11 is joined by brazing to a steel holder part 18, and percussion is also transmitted through a radially formed annular shoulder 19 on the holder part 18, against which shoulder the tube 11 is intended to rest.
  • the holder part 18 is formed with an axially projecting spigot 20, the diameter of which is adjusted so that the spigot can be inserted in the central cavity 21 of the tube 11.
  • the holder part 18 is provided with a central U- shaped slot 22 for accommodating the cutting bit 12, which is inserted and brazed in the slot.
  • the bit 12 has greater length than the slot so that it determines the diameter of the drillng hole.
  • the holder part 18 is provided with two recesses 22 and 24 extending axially and in diametrically opposite positions, along the entire length of the spigot 20.
  • the tube 11 can be cut off square, according to Figure 1.
  • the tube 11 is provided with tongues 32 on the portions of circumference not resting against the shoulder 19, such that these tongues cover the major por ⁇ tion of the recesses 23 and 24.
  • Each recess 23, 24 is formed with a lesser cross section than that of the central cavity 21 of the tube 11.
  • the annular shoulder 30 can be supplemented by an exterior flange or support ring 31.
  • the side connection 26 is intended for connecting to a separate suction means, such as an industrial vaccutn cleaner (not shown).
  • the part 13 and tubular sleeve 25 form a swivel coupling, whereby the sleeve 25 is thus not intended to be rotated during drilling, but is fixed by the tubular side connection 26 to the drilling machine.
  • the parts 13 and 25 of the swivel coupling can thus be given dimensions which are independent of the drill diameter, as will be seen from Figures 1 and 3 where the drill rod 11 and cutting bit 12 in Figure 3 are considerably less than in Figure 1, but otherwise with unaltered dimensions for the part 13.
  • the holder part 18 can also be made integral with or in contact with the part 13 and shank 14.
  • the recesses 23 and 24 then reach the whole way up from the forward tip of the holder part 18 to the lower edge of the part 13 there they are connected by axially made ducts 29 with the holes 28. Since in this case the holder part 18 extends backwards to the part 13 where the axial percussion is transmitted, there is no need of the engagement surface 19 and the tube 11 can therefore have the form of a thin walled tube, which promotes increased suction capacity in the inner cavity 21 of the tube 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (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)
  • Earth Drilling (AREA)

Abstract

With drilling in rock and concrete there is used a drill rod provided at its forward end with a cutting means and intended for rotation. The rod comprises a thin-walled tube (11) the central cavity (20) of which is formed such that openings (22 and 23) are formed adjacent the forwardly situated cutting bit (12) on either side of the bit. The central cavity (20) communicates in its rear portion with one or more openings (28) in a part (13) attached to a shank, and in turn the part (13) coacts with a surrounding sleeve means (26) such as to form a suction coupling for sucking out rock dust from the drill hole.

Description

A DRILL FOR ROCK AND CONCRETE
Drills for making holes in rock and concrete and intended for use with electrical hand drilling machines are generally made with carbide tips, which are fastened by brazing to a steel shank. Drilling is generally done dry, and the drilling machines generally provide torque and axial blows. During drilling the rock is crushed and pulverized due to the percus¬ sive and rotating contact with the carbide tip.
For conveying the rock dust thus formed out of the hole, traditional drills are provided with at least two helical shaped grooves which extend from close to the tip along the shank of the drill.
Drilling in a downward direction is more difficult to perform than in other directions for two reasons, both depending on difficulties with conveying the rock dust. The rock dust easily compacts in the grooves, and also it is not lifted up from the bottom of the hole to the beginning of the grooves and packs around the drill tips to prevent blows being trans¬ ferred to the rock. When drilling in a downward direction it is therefore necessary to lift the drill out after a short drilling length and clean the whole by blowing. This is particularly applicable with drilling in moist rock or con¬ crete. The result will be that the straightness of the hole and its roundness deteriorate, as well as the bore tip becoming worn more rapidly.
When drilling in mines and the like, and when large hole dia¬ meter holes are made in concrete, the rock is generally removed by blowing in air, or pumping in water or water mixed with air at an excess pressure through the drill rod, which is made hollow for this purpose and without helical grooves. The rock dust is here conveyed out from the hole in the space between the outside of the drill rod and the wall of the hole.
A disadvantage with all the mentioned methods is, however, that the rock dust collects at the drill hole openings where it can be difficult to handle. This is particularly a great disadvantage with drilling indoors.
In drilling upwards, or horizontally, the rock dust is also a problem, e.g. it can fall into the drilling machine chuck, which will then be rapidly worn.
Other structures for avoiding the problems with the rock dust include bellows which are pressed against the rock around the opening of the hole, which does not facilitate conveyance up out of the hole when drilling downwards.
It has also been proposed, for hollow drills which are provided with a large number of cutting edges round the end face of the drill and which leave a core during drilling, to use a combination of liquid supply on the outside of the drill and suction on the inside of the drill partly to cool the cutting edges and partly to retain the core when the drill breaks through a floor structure or a wall.
The present invention relates to a drill with a carbide cutting bit extending over the entire diameter of the hole, and adpated for drilling holes in rock or concrete without the supply of liquid, the dry rock dust being removed by suction in one or more ducts in the interior of the drill rod. To avoid the ducts being blocked by rock dust, their openings at the bit are made with a less area than the rest of the duct and with a sharp edge. The drill rod is made with a smooth cylindrical exterior of a less diameter than the length of the bit. Since carbide is relatively brittle, and can crack for unevenly distributed percussion, the carbide bit should be brazed into a holder part which supports the major part of the bit length, and in turn receives the precus- sion effect from the entire cross sectional area of the drill rod.
Immediately under the upper end of the drill shank the duct or ducts are connected via a rotary coupling of a known type to a dust suction means.
The upper end of the drill rod is formed in a manner known per se for transmission of percussion and torque from the drilling machine.
The invention will now be described in more detail and in connection with the accompanying drawing figures, where
Figure 1 is side view of one embodiment of the invention,
Figure 2 illustrates the embodiment in Figure 1 with a means mounted on it for connection to a suction means,
Figure 3 illustrates an alterantive embodiment.
Figure 4 is a side view of the cutting bit and holder part separated from the drill rod in Figure 1,
Figure 5 is a side view of the cutting bit and holder part in Figure 4,
Figure 6 is a front view of the cutting bit and holder part in Figures 4-5, and
Figure 7 illustrates the shank and a connection part,
Figure 8 illustrates an alternative embodiment.
The drill 10 illustrated on the drawings comprises a tube 11, provided at its forward end with a cutting bit 12 made from carbide or other like hardwearing material. The rear part of the tubular drill rod 11 comprises a cylindrical connection part 13 and axially rearward thereof a shank 14 adapted for transmission of percussion and torque. The tubular drill rod 11 is connected to the part 13 by brazing, preferably with a silver or copper based metal, and percussion from a drill machine 15 is also transferred via a shoulder 16 formed on the part 13, this shoulder extending round the entire circum¬ ference of the tube 11. The part 13 and shank 14 are preferably integral. To provide centering and a large joint surface for the brazed joint, the part 13 is made, for large drill dia¬ meters, with an axially projecting tubular spigot 17, which is thrust into the tube 11. For small drill diameters the cavity 27 is formed in the part 13 with a stepped bore so that the shoulder 16 will be situated inside the bore.
At its lower end the drill rod 11 is joined by brazing to a steel holder part 18, and percussion is also transmitted through a radially formed annular shoulder 19 on the holder part 18, against which shoulder the tube 11 is intended to rest. For providing centering and larger joint surface, the holder part 18 is formed with an axially projecting spigot 20, the diameter of which is adjusted so that the spigot can be inserted in the central cavity 21 of the tube 11. At its forward end the holder part 18 is provided with a central U- shaped slot 22 for accommodating the cutting bit 12, which is inserted and brazed in the slot. The bit 12 has greater length than the slot so that it determines the diameter of the drillng hole. By having the bit 12 fastened in a separate holder part 18, of more ductile material it has been possible to reduce the stresses on the cutting bit 12 made from carbide or similar material. In addition, the holder part 18 is provided with two recesses 22 and 24 extending axially and in diametrically opposite positions, along the entire length of the spigot 20. At its lower end, the tube 11 can be cut off square, according to Figure 1. Another advantageous embodiment is where according to Figure 2, the tube 11 is provided with tongues 32 on the portions of circumference not resting against the shoulder 19, such that these tongues cover the major por¬ tion of the recesses 23 and 24. Each recess 23, 24 is formed with a lesser cross section than that of the central cavity 21 of the tube 11. It is thus intended that air and dust caused by the drilling are sucked in through the recesses 23 and 24 and further into the central bore 21 in the drill rod 11. There is a cylindrical tubular sleeve 25 round the part 13 and implemented such as to form a swivel coupling, which in turn is provided with a tubular side connection 26. The part 13 is hollow and provided with an axially central cavity 27, as well as one or more holes 28, which are intended to lie at the same level and have approximately the sa t section as the bore 29 in the side connection 26. The tubular sleeve 25 is rotatably mounted round the part 13 and rests against an annular shoulder 30 on the part 13. Both the cavity 27 and holes 28 have a greater cross section than the recesses 23 and 24. It is thus ensured that the particles coming in via the recesses 23, 24 into the hollow drill 10 are not caught up in it.
The annular shoulder 30 can be supplemented by an exterior flange or support ring 31.
The side connection 26 is intended for connecting to a separate suction means, such as an industrial vaccutn cleaner (not shown).
The part 13 and tubular sleeve 25 form a swivel coupling, whereby the sleeve 25 is thus not intended to be rotated during drilling, but is fixed by the tubular side connection 26 to the drilling machine.
The parts 13 and 25 of the swivel coupling can thus be given dimensions which are independent of the drill diameter, as will be seen from Figures 1 and 3 where the drill rod 11 and cutting bit 12 in Figure 3 are considerably less than in Figure 1, but otherwise with unaltered dimensions for the part 13.
In an alternative embodiment of the invention, and for short drills, the holder part 18 can also be made integral with or in contact with the part 13 and shank 14. The recesses 23 and 24 then reach the whole way up from the forward tip of the holder part 18 to the lower edge of the part 13 there they are connected by axially made ducts 29 with the holes 28. Since in this case the holder part 18 extends backwards to the part 13 where the axial percussion is transmitted, there is no need of the engagement surface 19 and the tube 11 can therefore have the form of a thin walled tube, which promotes increased suction capacity in the inner cavity 21 of the tube 11.

Claims

1. Drill (10) for making holes in rock and concrete with the aid of a hammering and rotating electrical hand drilling machine, including a drill rod in the forward end of which there is arranged a cutting bit (12) which determines the cutting diameter and which is made from carbide or similar hardwaring material, characterized by, in combination, the following
(1) the drill rod having the form of a smooth cylindrical tube (11), the outer diameter of which is less than the cutting bit (12),
(2) the central cavity (20) of the tube (11) being formed such that adjacent the cutting bit (12) there are formed two openings (22) and (23), one on either side of the bit (12), and
(3) the tube (11) being connected at its rear end portion facing away from the cutting bit (12) to a cylindrical part (13) with one or more openings (28), which are arranged for co-action with a sleeve means (26) surround¬ ing said part and provided with a side connection, such as to form a suction coupling of the swivel type for connecting to a suction means.
2. Drill as claimed in claim 1, characterized in that the lower openings (23, 24) have a lesser cross section than the interior cavity (219 of the tube.
3. Drill as claimed in claim 1 or 2, characterized in that the lower openings (23, 24) have a lesser cross section than each of the upper openings (28).
4. Drill as claimed in any one of claims 1-3, characterized in that with the major part of its rear edge and its flat sides the cutting bit is fixed in a U-shaped slot (22) on a steel holder part (18) projecting inwards a distance into the tube (11), the tube thus engaging axially against a radial engagement surface (19) on the holder part (18).
5. Drill as claimed in any one of claims 1-4, characterized in that the outside of the holder part (18), on either side of the cutting bit (12), is provided with axially extending through-like recesses (23, 24) forming the lower openings to the inner cavity of the tube and which to a major extent project into the tube (11).
6. Drill as claimed in any one of claims 1-5, characterized in that the shank (14) and part (13) attached to the shank are integral and that a tubular part (17) extends from the part (13) and is formed with a diameter such that it is easily insertable into the tube (11).
7. Drill as claimed in claim 5, characterized in that the holder part (18) extends axially into union with the part (13), the recesses (23, 24) being formed axially along the entire holder part (18) to the part (13) where they are connected with the holes (28) via axially extending ducts (29) in the inner wall of the part (13).
8. Drill as claimed in any one of claims 1-7, characterized in that the lower part of the tube (11) is provided with tongues (32) axially projecting from the rest of the tube and in diametrically opposing positions for being partially inserted into and covering the major part of the recesses (23, 24) on the holder part (18).
PCT/SE1988/000416 1987-02-19 1988-08-16 A drill for rock and concrete WO1990002244A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE8700679A SE456808B (en) 1987-02-19 1987-02-19 Drill for stone and concrete
PCT/SE1988/000416 WO1990002244A1 (en) 1987-02-19 1988-08-16 A drill for rock and concrete
EP88908402A EP0429444A1 (en) 1987-02-19 1988-08-16 A drill for rock and concrete

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8700679A SE456808B (en) 1987-02-19 1987-02-19 Drill for stone and concrete
PCT/SE1988/000416 WO1990002244A1 (en) 1987-02-19 1988-08-16 A drill for rock and concrete

Publications (1)

Publication Number Publication Date
WO1990002244A1 true WO1990002244A1 (en) 1990-03-08

Family

ID=26659705

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1988/000416 WO1990002244A1 (en) 1987-02-19 1988-08-16 A drill for rock and concrete

Country Status (3)

Country Link
EP (1) EP0429444A1 (en)
SE (1) SE456808B (en)
WO (1) WO1990002244A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0941793A2 (en) * 1998-03-10 1999-09-15 HILTI Aktiengesellschaft Drilling tool
US6065908A (en) * 1998-03-10 2000-05-23 Hilti Aktiengesellschaft Drill
US6109620A (en) * 1996-02-22 2000-08-29 Boart Longyear Limited Shank adapter
EP1112808A2 (en) * 2000-01-03 2001-07-04 HILTI Aktiengesellschaft Connector for drill with suction unit
EP1112809A3 (en) * 2000-01-03 2003-07-16 HILTI Aktiengesellschaft Drill with suction means
JP2013159044A (en) * 2012-02-06 2013-08-19 Kyowa Kizai Kk Boring drill
WO2019166410A1 (en) * 2018-02-27 2019-09-06 Heller Tools Gmbh Rock drill with suction means

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH138263A (en) * 1929-02-07 1930-02-28 Brunzel Karl Equipment on rock drilling machines for extracting the drilling dust by means of a hollow drill.
FR903819A (en) * 1942-03-21 1945-10-18 Hollow drill for removing the suction drill menu
US3022840A (en) * 1959-03-19 1962-02-27 Mine Safety Appliances Co Dust collecting rotary rock drill
US3032129A (en) * 1959-05-01 1962-05-01 J H Fletcher & Co Dust collecting drill steel and bit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH138263A (en) * 1929-02-07 1930-02-28 Brunzel Karl Equipment on rock drilling machines for extracting the drilling dust by means of a hollow drill.
FR903819A (en) * 1942-03-21 1945-10-18 Hollow drill for removing the suction drill menu
US3022840A (en) * 1959-03-19 1962-02-27 Mine Safety Appliances Co Dust collecting rotary rock drill
US3032129A (en) * 1959-05-01 1962-05-01 J H Fletcher & Co Dust collecting drill steel and bit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6109620A (en) * 1996-02-22 2000-08-29 Boart Longyear Limited Shank adapter
EP0941793A2 (en) * 1998-03-10 1999-09-15 HILTI Aktiengesellschaft Drilling tool
US6065908A (en) * 1998-03-10 2000-05-23 Hilti Aktiengesellschaft Drill
EP0941793A3 (en) * 1998-03-10 2002-09-11 HILTI Aktiengesellschaft Drilling tool
CN100364742C (en) * 1998-03-10 2008-01-30 希尔蒂股份公司 Punching tool
EP1112808A2 (en) * 2000-01-03 2001-07-04 HILTI Aktiengesellschaft Connector for drill with suction unit
JP2001232578A (en) * 2000-01-03 2001-08-28 Hilti Ag Drilling and/or chiseling tool
EP1112808A3 (en) * 2000-01-03 2003-07-09 HILTI Aktiengesellschaft Connector for drill with suction unit
EP1112809A3 (en) * 2000-01-03 2003-07-16 HILTI Aktiengesellschaft Drill with suction means
JP2013159044A (en) * 2012-02-06 2013-08-19 Kyowa Kizai Kk Boring drill
WO2019166410A1 (en) * 2018-02-27 2019-09-06 Heller Tools Gmbh Rock drill with suction means

Also Published As

Publication number Publication date
SE8700679D0 (en) 1987-02-19
EP0429444A1 (en) 1991-06-05
SE8700679L (en) 1988-08-20
SE456808B (en) 1988-11-07

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